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Readers are advised to check that this Certificate has not been withdrawn or superseded by a later issue by contacting the Irish Agrément Board, NSAI, Glasnevin, Dublin 9 or online at www.irishagrementboard.com/certs.php?no=010116

CERTIFICATE NO. 01/0116Clearwater Polcon Ltd, Clearwater IndustrialEstate, Bristol Road, Bridgewater, Somerset, UK.

Tel: 0044 1278 433 443 Fax: 0044 1278 453 653e-mail: [email protected] website: www.clearwaterpolcon.co.uk

Aeroclere CLP6 WastewaterTreatment System for Single Dwellings.

PRODUCT DESCRIPTION:

This Certificate relates to the Aeroclere CLP6 WastewaterTreatment System for Single Dwellings. The system utilisesa Biological Aeration Filter process, to treat domesticwastewater, from dwellings with a population equivalentof up to six persons.

The unit is manufactured from glass-reinforced plastic(GRP), is cylindrical in shape and has three operating zones.

The total tank capacity is 2800 litres. For design loadingsand flows, the retention time is in excess of 48 hours. De-sludging should be carried out twice a year.

The life of the GRP tank, when installed and operated inaccordance with the Certificate holder’s instructions,should be in excess of 25 years. However, mechanicalcomponents, subject to normal wear and tear, will requirereplacement within this time.

USE:

The product is for use in wastewater treatment systemsdesigned in accordance with BS 6297: 1983 Code of practice

for design and installation of small sewage treatment worksand cesspools, and the EPA Wastewater treatment manual –Treatment Systems for Single Houses 2000, for the collectionand treatment of domestic wastewater, including theseparation and partial digestion of suspended matter, priorto discharge of the treated effluent.

MANUFACTURE AND MARKETING

The product is manufactured and assembled by:Clearwater Polcon Ltd, Clearwater Industrial Estate,Bristol Road,Bridgewater, Somerset, UK.Tel: 0044 1278 433 443 , Fax: 0044 1278 453 653e-mail: [email protected] website: www.clearwaterpolcon.co.uk

The product is marketed and distributed by:Clearwater Environmental Solutions Ltd Cullen, Mallow, Co Cork, Republic of IrelandTel: 029 - 79255 , Fax: 029 - 79266e-mail: [email protected]: www. Sewage-treatment.net

CI/SfB (12)

The Irish Agrément Board is designated by Government to issue European Technical Approvals.

Irish Agrément Board Certificates establish proof that the certified products are ‘proper materials’ suitable for theirintended use under Irish site conditions, and in accordance with the Building Regulations 1997 to 2002.

The Irish Agrément Board operates in association withthe National Standards Authority of Ireland (NSAI) as the National Member of UEAtc.

Certificate No. 01/0116 Aeroclere CLP6 Wastewater Treatment System for Single Dwellings.2

Part One / Certification 1

1.1 ASSESSMENTIn the opinion of the Irish Agrément Board (IAB), theAeroclere CLP6 Wastewater Treatment System issatisfactory for the purpose defined above, and canmeet the requirements of the Building Regulations1997 to 2002, as indicated in Section 1.2 of this Certificate.

1.2 BUILDING REGULATIONS 1997 TO 2002

REQUIREMENT

PART D – MATERIALS AND WORKMANSHIPD1 - The Aeroclere CLP6 Wastewater TreatmentSystem, used in accordance with this Irish AgrémentBoard Certificate, meets the requirements formaterials and workmanship.

D3 - The Aeroclere CLP6 Wastewater TreatmentSystem, as certified in this Irish Agrément BoardCertificate, is manufactured from proper materialsand is fit for its intended use. See Part 4 of this Certificate.

PART H - DRAINAGE AND WASTE DISPOSAL H1 Drainage systems

The Aeroclere CLP6 Wastewater Treatment System iseasily installed and incorporated into soil percolationsystems to meet Building Regulation requirements.

H2 Septic tanksThe Aeroclere CLP6 Wastewater Treatment Systemhas been designed for use in wastewater treatmentsystems, for the collection and treatment of domesticwastewater, when installed in accordance with therecommendations of BS 6297: 1983 and the EPAWastewater treatment manual – Treatment Systemsfor Single Houses 2000.

The quality of effluent from the Aeroclere CLP6Wastewater Treatment System exceeds that of theeffluent from a septic tank and can meet theBuilding Regulation requirements.

Information on the design, capacity, ventilation,safety and location requirements is given in this IrishAgrément Certificate. See Part 3 and 4 of this certificate.

Certificate No. 01/0116 Aeroclere CLP6 Wastewater Treatment System for Single Dwellings. 3

2.1 PRODUCT DESCRIPTION2.1.1 System Details

The Aeroclere CLP6 Wastewater Treatment Systemutilises a Biological Aeration Filter process to treatdomestic wastewater from dwellings with a populationequivalent of up to six persons.

The tank is formed in two halves, from glassreinforced plastic.

An air compressor supplies air to an air bubblediffuser system in the biozone. The compressor,which is located within an integral chamber at thetop of the unit, operates on a continuous basis. Theair compressor is ventilated through an integralventilation duct. The unit operates off a normaldomestic power supply, and is connected to thedwelling served by a residual current device (RCD).

Inlet, outlet and vent pipe connections are providedand are clearly labelled.

The unit is accessed via the pedestrian duty GRPmanhole cover, designed to be flush with groundlevel. The cover is held in place by two, stainless steel,tamper proof locking mechanisms, which require aspecial tool for removal.

Discharge from the tank is by gravity.

Provision can be made for pumped discharge, bysupplying a pumping system if required. Pumpedsystems shall be designed by a competent person.Adequate provision should be made for storage inthe event of pump failure. This is outside the scope ofthis certificate.See diagram over page.

2.1.2 TreatmentTreatment is carried out in three phases, as follows:

Zone 1 Domestic wastewater enters the primarysettlement zone through the inlet pipe. Heavy solidsare retained and sink towards the base of thechamber, where they are retained, until the tank isdesludged. Lighter debris and grease rise to thesurface to form a crust. The remaining effluent isdisplaced from the primary zone into the submergedmedia section (Zone 2).

Zone 2 As the supernatant liquor passes through thesubmerged media in the filter chamber, it isbiodegraded by micro-organisms, which develop andgrow in suspension on the bio-media. These naturallyoccurring organisms utilise the organic material inthe effluent as a food source, thus reducing the

Part Two / Technical Specification and Control Data 2

Biochemical Oxygen Demand. In order to achieve this,the organisms require an adequate supply of oxygen.This is provided by aerating the filter chamber via theair diffuser arrangement. Excess micro-organisms areshed from the media as solid particles, known as humus.

Zone 3 Treated effluent is displaced from the filterchamber into the final settlement zone. Here, humussolids settle out and form a sludge on the tank base,for desludging in accordance with the Certificateholder’s instructions. The effluent is discharged, bygravity, into the outlet pipe, and from there, to thepercolation area.

2.2 MANUFACTURE2.2.1 General

The main sections of the tank body, aremanufactured from cold setting polyester resinreinforced glass fibres, in an open mould systemusing a spray lay-up technique. The top and bottomsection of the tank are bonded together by stainlesssteel rivets and sealed with layers of polyester resin.The turret and legs are similarly bonded. Internaljoints are sealed with layers of polyester resin. Agalvanised frame is cast into the turret of the tank tosupport a grp cover.

The air compressor housing, access cover and internalmouldings are laminated separately before beingincorporated into the unit.

The diffuser, and internal and external pipe work arefitted and the unit is subjected to water tightness testing.

2.2.2 Product rangeThe system is designed to collect domesticwastewater from dwellings having a populationequivalent of up to six persons. System details areshown in Table 1.


Compressor

ScumBaffle MEDIA

TREATMENTZONE

110mmøGravity outlet

110mmøInlet

Hinged lockablepedestrianduty cover

Freshair Inlet

Diffuser

10501150

750

O/A Length2350

1000(outside)

Primary

Settlement Chamber

Media

Treatment Zone

Final

Settlement Chamber

Figure 1 Section through tank


Ancillary items

■ Electrical control panel, float switch and alarm.

■ 110 mm uPVC inlet and outlet sockets to BS 4660: 2000 Thermoplastics ancillary fittings ofnominal sizes 110 and 160 for below ground gravitydrainage and sewage

■ electrical cable glands

All components in contact with effluent are made ofstainless steel, uPVC or glass reinforced plastic.

Quality control

The Certificate holder operates a qualitymanagement system and continuous quality controlis exercised during manufacture. Quality checksinclude carcass weight, tank wall thickness, visualinspection and water tightness testing.

2.3 DELIVERY, STORAGE AND MARKINGThe unit is delivered to site fully assembled. It shallbe lifted with certified webbing straps in accordancewith the Certificate holder’s instructions. Off loadingshall be carefully supervised and lifting equipmentshall be selected taking into account the unit weight,dimensions and the distance of lift required (seeTable 1). All lifting equipment and procedures shallcomply with the requirements of the Safety, Healthand Welfare at Work Act 1989. The Certificate holder’sinstructions shall be followed to avoid damage to thetank during off-loading and installation.

Each unit bears a unique serial number, fortraceability purposes, which is located on anidentification plate inside the turret. The plate alsocarries with the Certificate holder’s details, model

type and population equivalent capacity, such that allare clearly visible once installation is complete.

The tank is supplied with full installation instructionsand is labelled with the IAB identification Markincorporating the number of this Certificate.

The tank should be stored upright, on ground whichis level and free of sharp objects, with the cover inplace to prevent ingress of water.

2.4 INSTALLATION2.4.1 General

Clearwater Polcon Ltd supplies detailed installationinstructions and offers a full commissioning andinstallation supervision service through itsnominated approved distributors.

Clearwater Polcon Ltd recommends that a competentperson, e.g. an appropriately qualified andexperienced engineer or surveyor, conduct a sitesuitability assessment. Based on this assessment, thecompetent person should design and superviseinstallation and commissioning of the unit.

Clearwater Polcon Ltd will commission all systemsbefore use using its nominated approved distributors.

2.4.2 Electrical WorksElectrical connections shall be strictly in accordancewith the Certificate holder’s instructions, ET101: 2002National Rules for Electrical Installations (3rd Edition)incorporating Amendment No. 1 2001 and ET 207: 2003Guide to the National Rules for Electrical InstallationsAs Applicable To Domestic & Similar Installations,published by the Electro-Technical Council of Ireland(ETCI). A competent person, using materials suitablefor the purpose (i.e. a 2.5 mm2 three-core SWA cablecomplete with earth), shall carry out electricalconnections, from the mains supply board.

Electrical cables shall be protected from accidentaldamage e.g. by a suitable conduit. It is recommendedthat the control panel is clearly visible from a suitablelocation within the house.

2.4.3 Site WorksThe excavation shall be of sufficient size to permitplacement of the unit and back filling and to allowfor timbering and sheeting as necessary to meet therequirements of The Safety, Health and Welfare atWork Act, 1989. There should be sufficient area onsite to permit excavation, dumping of excess spoil,backfilling, handling and installation, without causingdamage to the unit or the ancillary equipment.

It is essential to prevent damage due tosuperimposed loading, from vehicles or site traffic. Asuitable fence shall be erected around the unit torestrict loading. The distance between the fence andthe unit should be equal to or greater than the depthof excavation for the unit.

Table 1 Aeroclere CLP6 Wastewater Treatment System – basic informationTreatment Capacity 2800 litresDesign Population 6 PEOverall width 1250 mmOverall length 2350 mmTotal height 1900 mmWeight (empty) 350 KgDesign flow rate 1200 litres/dayBOD load 0.36 Kg/dayInlet invert to base 1150 mmOutlet invert to base 1050 mmGround level to inlet invert level 750 mmAir blower motor rating 60 wattsDe-sludge period 6 monthlyThickness 5.00 mm top

5.11 mm joint6.37 mm base

Retention time (design case) 56 hours


Care shall be taken to prevent accidental damagearising from blows from tools, or concentratedpressure on the shell from levering etc.

Similarly, sharp corners or edges of bricks and stonesshall be kept clear of the unit. This shall be borne inmind when back filling, as the resultant load of asharp object could fracture the unit.

The tank should not be lifted if it contains water.

2.4.4 DesignThe potential suitability of a site, for the installationof such a system, shall be assessed using themethodology outlined in the the EPA Wastewatertreatment manual – Treatment Systems for SingleHouses 2000. The ground water protection responsesset out in ‘Groundwater Protection Responses for on-site Wastewater Systems for Single Houses’ publishedby EPA/DoELG/GSI (2001) should be used in the deskstudy assessment of the site, to give an early indicationof the suitability of the site for such a system.

The system should only be installed where acompetent authority determines the groundconditions, and the water table levels, to beadequate to support the tank, and to provide fordisposal of the effluent in accordance with relevantregulations. The system should not be installed inunsuitable ground conditions.

Where poor ground conditions prevail, e.g. softground or shrinking clay, further advice must besought from a competent person, to establish if theground is adequate to support the tank and preventdifferential settlement.

Good ground working practice shall be followed,particularly with regard to the gradient on drainagepipe runs. The inlet pipe should have a gradient ofbetween 1:40 and 1:60. The outfall pipe should have afinal gradient of between 1:70 and 1:200.

Storm water run-off e.g. from roofs or paved areasshall be excluded from the system.The system shall not be installed in areas liable tolocalised flooding, unless adequate additionalprotection is provided in accordance with theCertificate holder’s instructions.

The thickness and strength of concrete surroundshall be selected to suit the ground conditions,imposed loads etc, for the design life of the unit.Minimum requirements are given in this certificate.

Adequate provision should be made for access,inspection and maintenance, in the drainage systemupstream and downstream of the unit, through theprovision of manholes, distribution chambers etc.

Adequate provision shall be made for ventilation, to ensurethat noxious odours and dangerous gases can escape.

2.4.5 Health and SafetyExcavation, placing and backfilling should be carriedout strictly in accordance with the requirements ofthe Safety, Health and Welfare at Work Act 1989 andall other relevant legislative requirements.

2.4.6 Procedurea) Equipment and materials

The Aeroclere CLP6 Wastewater Treatment Systemis of lightweight construction and can be handledby a mini-digger.

It is recommended that all plant and materialsnecessary for the installation should be on sitebefore excavation commences.

b) Tank Installation – dry siteA dry site is defined as one where the local watertable never rises above the base of the treatment unit.

The tanks shall be installed as follows:

1. Soft spots/boulders etc are removed from thebase of the excavation. A level, graded base isthen formed using sand blinding.

2. A foundation of semi-dry concrete is laid andlevelled. The concrete shall be of sufficient gradeand thickness (minimum 150 mm and grade 25 N) to ensure that the unit is fully supportedwith due regard to subsoil conditions and loadsimposed by the unit. Care shall be taken toeliminate voids.

3. The tank is lifted into position using slings inaccordance with the Certificate holder’sinstructions. Care should be taken to preventdamage to external flanges or pipe work and toensure correct orientation of the inlet and outletpipe work. The unit shall be installed at therequired depth to accommodate incomingdrainage pipes.

4. The concrete is haunched up around the base ofthe unit, ensuring the feet are embedded, the topof the tank is level and that all connections line up.

5 As backfilling progresses, the unit is progressivelyfilled with water, to prevent uplift.

6. The excavation is then backfilled to above thejoint, with a minimum of 200 mm surround(G25N concrete).

7 The backfilled concrete shall be carefullycompacted around the unit, to ensure transfer ofground loads and to prevent stressconcentrations. Vibrating pokers shall not be usedas these may damage the grp unit. Allow aninitial set of concrete and wait at least 24 hoursfor the concrete to harden before finalbackfill/landscaping. Where a high water tableexists, continue dewatering for 24 hours.


8 The reminder of the excavation is then backfilled,with suitable selected self compacting pea gravelor suitable granular material, (compaction factorof 0.2 or less), to the underside of pipe work connections,ensuring the connections remained exposed.

c) Additional requirements for wet sites A wet site is defined as one where the local watertable can rise above the base of the treatmentunit. Installation in a wet site may be precluded bysite considerations in relation to effluent disposal.

9. A 250 mm hardcore sub-base is laid, compactedand levelled.

10. The excavation is kept dry by pumping excesswater using a site pump/sump hole/suction hosearrangement. Dewatering should be continuedfor as long as necessary and at least until theconcrete has set.

11. The excavation is then lined with a continuouslayer of 1200 gauge polyethylene sheet. The gradeand thickness of the concrete base should bedesigned to suit site conditions (minimum 250thick, grade 25 N).

12. The unit shall be installed and the excavationbackfilled generally in accordance with therequirements for dry sites. However, theexcavation shall be backfilled with concrete toapprox 300 mm below ground level. Allowanceshall be made for flexible joints at pipeconnections where necessary.

d) Drainage ConnectionsThe tank is provided, at the inlet and outlet, with110mm uPVC pipes connections to BS 4660. Theseshould be connected, via a flexible connection toallow for differential movement, (300mm lengthof pipe with flexible joints), to the drainagesystem. Suitable adapters shall be used forconnection to other types of pipe work.

e) VentingVent pipe connections are provided and are clearlymarked on the unit.

f) DuctingA 100 mm uPVC duct should be laid from the markedconnection point on the unit to the power supply.

g) Completion of backfillingWhen connections to drainage and ventilationpipe work are complete and ducting in place,continue backfilling, terminating 100mm belowthe underside of the top flange. The remainingbackfilling should be completed to ground level,using selected non-angular excavated material.

2.5 LOCATIONThe units should be sited so that adequate access isavailable for safe installation, subsequentmaintenance and de-sludging of the unit. De-sludging should be carried out by means of a de-sludging tanker, which requires access to within 30mof the unit, without transgressing the minimumseparation distance between the unit and theeffluent percolation system, given in Table 2.

Table 2 Minimum Separation Distance (m)Unit Irrigation Area

Dwelling served 71 103

Adjacent dwelling 71 103

Wall 31 3Road 41 4Site boundary 31 3Potable water source 10 30-1002

Water course 10 10Lake 50 50

1. The depth of excavation to accommodate the unitshall be taken into account when determining thisdistance. The separation distance should be such thatthe excavation does not undermine adjacentbuildings, roads or walls. This distance should be notless than 1.5 times the excavation depth.

2. The separation distance should be not less than 30 metres except in the case of very free drainingsoils or gravels, where a minimum distance of 40metres should be maintained. The irrigation areashould be down hill of any nearby well. Where this isnot possible, a separation distance of at least 100metres shall apply. For further details see GroundWater Protection Responses for On-Site Waste WaterSystems for Single Houses published byEPA/DoELG/GSI (2001).

3. These minimum permissible distances are forguidance only. A ‘Competent Person’ should assesseach site on its own merits. However, where the sitepermits, irrigation areas should be located at greaterseparation distances from the dwelling. Also wherepossible on sloping sites, the irrigation area should bedown slope from the dwelling.

2.6 TREATED WASTE WATER DISPOSAL2.6.1 General Principles

The unit produces a fully treated wastewater, (BOD<20 mg/l; suspended solids <30 mg/l), which is moreeasily absorbed into soil strata than septic tankeffluent. There are two methods used for the disposalof treated wastewater i.e.:

a) Sub-surface irrigation, or

b) Raised percolation bed.


Figure 2 Typical layout of wastewater treatment system

2.6.2 Site Suitability AssessmentA ‘competent person’, as defined by the appropriateAuthority, should undertake the site suitabilityassessment,and choice of disposal method (see Cl 2.4.4).

The assessment shall include a detailed visualinspection of the site, inspection of the trial hole forsoil profile, depth of water table, percolation value,(e.g. Standard ‘T/P’ test), together with localknowledge of the area. From this information itshould be possible to ascertain the suitability of thesite and the size and type of percolation area required.

The results of this assessment will (a) determine ifthe site is suitable and (b) enable the selection of themost suitable method for disposing of the finaltreated effluent, having due regard to soil type andpercolation characteristics, water table level andother factors.

Guidance for sizing of a percolation area is set out inTable 3. Treated wastewater is discharged from theunit by gravity or by pumping if a raised bed facility isrequired (See Cl 2.1.1).

2.6.3 Sub-Surface percolationThe treated wastewater discharges, by pump or by

gravity, into a network of perforated pipes laid instone filled trenches. The objective is to spread theeffluent as evenly as possible over the required landarea, thus minimising the possibility of the groundbecoming over-saturated.

The discharge from the unit contains minimalsuspended solids and is therefore, much more readilyabsorbed than septic tank effluent. The extent of theirrigation system is determined by the siteassessment, taking into account the soil type andpercolation test results, as well as the population tobe served (see Table 3). These values are given forguidance only and should be discussed in detail withthe competent person who conducted the sitesuitability assessment.

Trenches are generally 450 mm to 900 mm wide. Thebase of the trench should be at least 600 mm to1200 mm above the water table or fissured bedrockas per EPA guidelines. Typically, perforated pipe (110 mm OD for gravity discharge; 32 mm OD forpumped discharge) is laid on a 250 mm bed of clean20/30 mm washed stone or gravel. The percolationtrench is backfilled to give 500 mm overall depth ofwashed stone or gravel.

2.7 ALARM A visual alarm is supplied to warn of power failure.

2.8 COMMISSIONINGClearwater Polcon Ltd service technicians, or itsapproved distributors, shall carry out commissioning,after installation is complete and all services are connected.

2.9 SERVICING AND MAINTENANCE Clearwater Polcon Ltd offers service and maintenancecontracts, through its approved distributors, and canalso carry out repair work.

2.10 ENCLOSURE The area around the tank and percolation area shouldbe fenced off to protect it from farm animals andother unwanted traffic.


Table 3: . Guidance for sizing of percolation area (linear metres of percolation pipe)

450 mm 900 mm 450 mm 900 mm

3 48 24 24 12

4 64 32 32 16

5 80 40 40 20

6 96 48 48 24

Required length of trench (m)

T/P values 21-50*Loading at 25l/ m2 per day

Trench width

T/P values 1-20*Loading at 50l/ m2 per day

Trench width

Population served

The trench is then covered with a geotextile layer, beforefinal backfilling to ground level with 300 mm topsoil.

Layout of the trenches will be determined by sitetopography; the overall fall of the pipes should be notmore than 1 in 200.

2.6.4 Raised percolation bedWhere raised percolation beds are required e.g. thintopsoils and/or rock or water table close to thesurface, the capacity of the pump needs to beselected to suit (See Cl 2.1.1).

The percolation trench construction is similar to thatspecified for sub-surface percolation. The base of thepercolation trench should be 600 to 1200 mm abovethe highest water table or fissured bedrock as perEPA guidelines. The perforated pipe is laid on a 250mm bed of clean 20/30 washed stone or gravel. Thetrench is then backfilled to give an overall depth of500mm. The trench is covered with a geotextile layer,before backfilling to ground level with 150 mmminimum of good quality topsoil.

2.6.5 Provision for inspection of percolation areaFor monitoring, sampling and maintenance purposes,access to the effluent percolation systems should beprovided at the end of each irrigation or filter trenchvia a suitably constructed inspection chamber.

2.6.6 Further treatmentIn some instances (e.g. proximity to a drinking watersource), the effluent may require "polishing" beforedischarge, to reduce coliform bacteria levels. Acommonly used method is to pass the dischargethrough a sand filter. In this situation, the dischargeis pumped to the sand filter using an effluent pumpset capable of discharging in 180 litre doses. Polishingfilters can be partly or wholly above ground soil,covered or open. A typical filter serving a 4-personhousehold would have a plan area of 8 m2 to 20 m2,depending on design and type of sand used.

Where part of the polishing system is exposed aboveground, care shall be taken to ensure there is no riskof casual or accidental access to the area.


Figure 3 Section through percolation trench

Figure 4 Typical plan and section through raised percolation bed


3.1 GENERALThe Aeroclere CLP6 Wastewater Treatment System issuitable for the collection and treatment of domesticwastewater and shall be installed in accordance withthe Certificate holder’s instructions, the EPAWastewater treatment manual – Treatment Systemsfor Single Houses 2000 and to conform with therecommendations of BS 6297: 1983. The followingconditions shall apply:

■ Design loadings shall be based on the maximumpopulation served;

■ The Certificate holder or his agent forinspection/audit maintains detailed siteassessment records and installation locations.

■ The unit shall be sited/installed in accordancewith the relevant Building Regulations.

■ Ground water and flood levels shall always bebelow outlet level.

■ The effluent shall be discharged to a suitable sub-soil irrigation system or raised percolation bed. Theirrigation system shall be correctly designed inaccordance with the detailed site assessmentreport for the ‘particular site’.

■ All wastewater treatment systems shall beindelibly marked with the model type andpopulation equivalent in such a way that wheninstallation has been completed, these details areclearly visible for record purposes.

The effluent from the unit will normally be withinRoyal Commission Standard (i.e. suspended solidscontent less than 30 mg per litre and BiochemicalOxygen Demand (BOD) less than 20 mg per litre)provided that the hydraulic and BOD loadings arewithin the limits recommended by the Certificateholder for the unit installed (200 litres per head perday and 60 grammes per head per day, respectively).

Under certain unusual conditions, the resultingeffluent may not be within Royal CommissionStandards. This is normal for any biological sewagetreatment process, and may be caused by unusualhydraulic or BOD loading, weather conditions, contaminationby excessive quantities of (a) offal and grease, (b) householddisinfectants, (c) detergents or poisoning of microbiologicalflora or fauna by other chemicals.

3.2 DESIGN BASIS3.2.1 General

The relevant dimensions of Aeroclere CLP6Wastewater Treatment System certified in thisAgrément Certificate are shown in Table 1.

3.2.2 Wastewater quality

The specification and power requirements of theAeroclere CLP6 Wastewater Treatment System arelisted in Table 1.

The unit can be used to provide temporary sewagetreatment facilities. A short period of acclimatisationshall be allowed after commissioning of the unitbefore a full degree of treatment can be expected.This period is generally a few weeks and is normal forany biological treatment plant.

Part Three / Design Data 3

Table 4: . Treated wastewater characteristics

pH 6-9

BOD < 20 mg/l O2Suspended Solids < 30 mg/l


4.1 ENVIRONMENTAL ASSESSMENTThe treated wastewater from a number of workingunits has been monitored. The test results show that values stated for the parameters listed in Table 4 are consistently achievable over a range ofoperating conditions.

4.2 STRENGTHThe Certificate holder’s design has been assessed assatisfactory. The unit has adequate resistance toresist damage from minor impacts during handlingbut it shall be slung in accordance with theCertificate holder’s instructions.

The unit has sufficient structural strength to resistsoil loads in non-cohesive dry soils, but it isrecommended that excavations are backfilled inaccordance with Cl 2.4.6.b), to resist uplift of units,due to buoyancy. The cover and frame assembly issuitable for pedestrian traffic only.

4.3 WATERTIGHTNESSThe system, when correctly installed, has beenassessed as fully capable of preventing seepageeither into or from the surrounding soil. The pipejoints, when correctly made, will be watertight.

4.4 DURABILITYThe structural properties of the glass-reinforcedplastic, from which the tank is constructed, incommon with all similar materials, will deterioratewith time. This deterioration is accelerated by contactwith ground water, sewage and dissolved orsuspended organic or inorganic compounds. Theresulting loss of strength or stiffness has been takeninto account in the Certificate holder’s design code. Inthe opinion of the IAB the product will have a life inexcess of 25 years when installed in accordance withthis Certificate. Protected steel components mayrequire further protection by painting, but thisshould not be required for at least 10 years. Themechanical and electrical components may requirereplacement within the design life.

4.5 MAINTENANCECleaning and maintenance should be carried out inaccordance with the Certificate holder’s Operationand Maintenance Instructions.

To obtain access to interior of the tank, open themanhole cover using the lifting keys provided. Thecover is of lightweight, but strong construction, andwill lift easily. Both the compressor and theassociated pipe work can also be accessed forremoval and cleaning.

The tank is easily de-sludged, in the conventionalmanner by a suction tanker. De-sludging should be carriedout in accordance with the Certificate holder’s instructions.

Summary of maintenance instructions

The Aeroclere CLP6 Wastewater Treatment System isde-sludged by a suction tanker. Care shall be taken toavoid damage by the hose nozzle. Both the primaryand final settlement zones shall be de-sludged inaccordance with the Certificate holder’s recommendations.

The Certificate holder, or a suitably experiencedperson, using standard GRP repair techniques, canrepair local damage to GRP components. Any repairsshall be carried out in dry conditions. The GRPlaminate to be repaired shall be thoroughly cleaned,dried, lightly abraded and prepared with a suitablebonding agent.

Frequency of inspection

It is recommended that an inspection of the systemshall be carried out regularly and at least every six months

4.6 SAFETY4.6.1 Safety of personnel

The access cover is securely fixed and lockable, toprevent unauthorised access. The access cover shallnot be left off an unattended tank.

Sewage treatment plants are potentially dangerous,particularly when being desludged. Desludging shallnever be carried out alone. If it is necessary to enterthe unit, adequate safety precautions shall be madeto ensure the safety of personnel involved. Nakedlights, which can cause explosions, shall not be usedin the vicinity of the tanks.

The unit should be positioned, or marked, orprotected, to prevent superimposed loading oraccidental impact by vehicles.

4.7 TESTS AND ASSESSMENTS WERE CARRIED OUT TODETERMINE THE FOLLOWING:■ Resin/glass ratio based on BS 2782-10:Method

1002:1977, Methods of testing plastics. Glassreinforced plastics. Determination of loss onignition

■ Barcol hardness, based on BS 2782-10:Method1001:1977 Methods of testing plastics. Glassreinforced plastics. Measurement of hardness bymeans of a Barcol impressor

■ Watertightness

■ Strength of cover and frame assemblies.

Part Four / Technical investigations 4


■ Resistance of units to hydrostatic and groundpressure.

■ Resistance to flotation.

■ Environmental performance.

■ Laminate thickness.

■ Flexural tests on composite specimens to BS EN ISO 178:1997 Plastics. Determination of flexural properties

■ Water absorbtion tests on composite specimens toBS 2782 Method 551A

4.8 OTHER INVESTIGATIONS(i) The manufacturing process was examined

including the methods adopted for qualitycontrol, and details were obtained of the qualityand composition of the materials used.

(ii) An examination of the results of sample analysisof effluent from the system, to measuresuspended solids content and BiochemicalOxygen Demand, was undertaken.

(iii) An assessment of the tank was made in relationto degradation of mechanical properties owing toexposure to sewage, ground water, dissolved saltsand dilute acids or alkalis; long-term loading conditions.

(iv) Site visits were conducted to assess thepracticability of installation

(v) Bought in components were assessed forsuitability for use.

No failures of the product in use have been reportedto the IAB.


5.1 National Standards Authority of Ireland ("NSAI")following consultation with the Irish Agrément Board("IAB") has assessed the performance and method ofinstallation of the product/process and the quality ofthe materials used in its manufacture and certifiesthe product/process to be fit for the use for which itis certified provided that it is manufactured, installed,used and maintained in accordance with the descriptionsand specifications set out in this Certificate and inaccordance with the manufacturer's instructions andusual trade practice. This Certificate shall remainvalid for five years so long as:

(a) the specification of the product is unchanged.

(b)the Building Regulations 1997 to 2002 and any other regulation or standard applicableto the product/process, its use or installation remains unchanged.

(c) the product continues to be assessed for thequality of its manufacture and marking by NSAI.

(d) no new information becomes available which inthe opinion of the NSAI, would preclude thegranting of the Certificate.

(e) the product or process continues to be manufactured,installed, used and maintained in accordance withthe description, specifications and safetyrecommendations set out in this certificate.

(f) the registration and/or surveillance fees due to IAB are paid.

5.2 The IAB mark and certification number may only beused on or in relation to product/processes in respectof which a valid Certificate exists. If the Certificatebecomes invalid the Certificate holder must not usethe IAB mark and certification number and mustremove them from the products already marked.

5.3 In granting Certification, the NSAI makes norepresentation as to;

(a) the absence or presence of patent rightssubsisting in the product/process; or

(b)the legal right of the Certificate holder to market,install or maintain the product/process; or

(c) whether individual products have beenmanufactured or installed by the Certificate holder in accordance with the descriptions and specifications set out in this Certificate.

5.4 This Certificate does not comprise installationinstructions and does not replace the manufacturer'sdirections or any professional or trade advice relatingto use and installation which may be appropriate.

5.5 Any recommendations contained in this Certificaterelating to the safe use of the certified product/processare preconditions to the validity of the Certificate.However the NSAI does not certify that themanufacture or installation of the certified productor process in accordance with the descriptions andspecifications set out in this Certificate will satisfythe requirements of the Safety, Health and Welfare atWork Act. 1989, or of any other current or futurecommon law duty of care owed by the manufactureror by the Certificate holder.

5.6 The NSAI is not responsible to any person or body for loss or damage including personal injury arisingas a direct or indirect result of the use of this product or process.

5.7 Where reference is made in this Certificate to any Act of the Oireachtas, Regulation made thereunder,Statutory Instrument, Code of Practice, NationalStandards, Manufacturer's instructions, or similarpublication, it shall be construed as reference to suchpublication in the form in which it is in force at thedate of this Certification.

Part Five / Conditions of Certification 5


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This Certificate No. 01/0116 is accordingly granted by the NSAI to Clearwater Polcon Ltd on behalf of The Irish Agrément Board.

Date of Issue: March 2001

Signed

Chief Executive, NSAI

Readers may check that the status of this Certificate has not changed by contacting the Irish Agrément Board,NSAI, Glasnevin, Dublin 9, Ireland. Telephone: (01) 807 3800. Fax: (01) 807 3842. www.nsai.ie

The Irish Agrément Board is designated by Government to issue European Technical Approvals. Irish Agrément BoardCertificates establish proof that the certified products are ‘proper materials’ suitable for their intended use under Irishsite conditions, and in accordance with the Building Regulations 1997. The Irish Agrément Board operates in associationwith the National Standards Authority of Ireland (NSAI) as the National Member of UEAtc.

The Irish Agrément Board

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