plants pent ict on 2008

8/6/2019 Plants Pent Ict on 2008

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Advanced Wastewater Treatment Plant

Plant Profile

2008


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Brief History

Wastewater treatment started in Penticton in 1948 with a Package Primary / Secondaryplant at what is now the Alberni Lift Station. The existing plant location has had aSecondary Activated Sludge Treatment Plant since 1960, with a design capacity of 5.5ML/d. In 1970, the plant capacity was increased to 8.2 ML/d with construction of additional primary and secondary clarifiers, plus chemical coagulation facilities for

phosphorus removal. Between 1970 1985, a number of improvements and increases to theplant's treatment capacity were made to cope with increasing wastewater flows and loads.In 1985 the BC Waste Management Branch prepared a report which reviewed therequirements for discharge of municipal effluents to the Okanagan Lake system. It wasdetermined continued surface discharge of treated effluent to Okanagan Lake, OkanaganRiver and Skaha Lake would be possible, provided advanced tertiary treatment wasimplemented to ensure high quality effluent. The report recognized that land applicationproposals would also require advanced tertiary treatment.

Stanley & Associates Engineering Ltd. completed a Liquid Waste Management Plan for theCity in 1987, and was subsequently commissioned by the City to provide design,construction management and plant commissioning services for a new AdvancedWastewater Treatment Plant (AWWTP). The new and expanded AWWTP, with biologicalnutrient removal, was constructed and commissioned in the fall of 1990. The plant isdesigned to treat 18.2 ML/d with a hydraulic capacity of 36.2 ML. After the plant wascommissioned, an optimization study was conducted on the Bio reactor that showed acapacity up to 28.0 ML/day is available for the Bioreactor. The BC Ministry of Environment paid for 75 percent of the cost of the new facility through the OkanaganWater Quality Control Project.

Original Plant Circa 1958 Located on Alberni Ave.


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Collection System

The wastewater collection system has eleven pumping stations. Two of these are larger insize using 50 and 60 horsepower pumps while the remaining are 3 to 5 horsepower. Onelarger station is located at the south end of the city using two water-cooled submersiblepumps with a stand-by power plant. The other larger station located at the north end of thecity has three submersible pumps with a stand-by power plant.

New Alberni St. Lift Station Installation

The Plant

In 2007 the Advanced Wastewater Treatment Plant (AWWTP) received 4,950 MillionLitres (ML) of influent from the sanitary sewer system. Compared to 2006s influent flowof 5,061 ML. This decrease in flow may be the result of the Cities initiative in waterconservation. The 2007 average daily influent flow rate was 13.6 ML/day. The averageinfluent flow rate per person was 399 litres/day/person, based on the 2007 Pentictonpopulation estimate of 34,002 people (from 1997-2007 BC Stats)

http://www.bcstats.gov.bc.ca/data/pop/pop/mun/Mun2007a.asp


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Treatment Plant Goals & Objectives completed for 2007 included

Liquid Waste Management Plan completed and signed off by the Minister of Environment.Completed the Request for Qualifications (RFQ) process to select a qualifiedconsultant to start design work for AWWTP upgrade. Earth Tech and Stantec were

chosen.Completed the Request for Proposal process for Preliminary Design, Detail Designand Construction Management work for AWWTP upgrades. Earth Tech waschosen.Started Functional Pre-Design with Earth Tech, to be completed February 2008.Preliminary Design, Detail Design and Tendering of the Septage Receiving Facilitycompleted.A three year training plan for staff is in its third year and continues to promote thedevelopment and retention of staff. 100% of staff completed the 2.4 C.E.U.snecessary to retain EOCP certification.Construction of a chemical dosing facility completed at Lakeside North Lift Station,to correct an ongoing odour problem for residents of Lakeside Rd.9 out of 10 capital upgrade projects planned this year were completedCreation of a Foremans position and one added Operator III position were put inplace to improve the staff structure for the AWWTP and to help attract and retainstaff.Methane Gas Boiler replacement completed as part of the equipment replacementcapital fund.

Treatment Plant Goals & Objectives planned for 2008

Preliminary Design and Detailed Design for the AWWTP plant expansion.Continue with the annual equipment upgrading program that is set out in the budget,which is designed to maintain reliable and efficient operation of the AWWTP.Construction of a septage receiving facility at the AWWTP.Preliminary Design, Detailed Design and Construction of a new effluent line tosouth end of Penticton that will be used to expand the effluent irrigation system andeffluent disposal in the busy summer months.Monitor dilution ratios into Okanagan River Channel daily.Continue to introduce new technology into the treatment systems which will thenhelp to produce safe waters.

Support the direction from council for the sewer connection of the Penticton IndianBand areas into the WWTP.Maintain a full complement of staff to help support operation activities during theyear in which larger capital projects are proposed.Finalize the operational certificate as part of the AWWTP upgrade.Meet the divisional performance measures that are set for the WWTP.


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Headworks and Primary Treatment

Headworks & Primary treatment consists of the following: three Archimedes screwpumps, mechanical bar screen, Pista degritter, six rectangular primary clarifiers, two flowequalization basins and two sludge fermenters to supplement the phosphorous removalprocess. The existing digesters from the old activated sludge process are now used forprimary sludge digesting and some secondary sludge (RAS) digesting.

Primary Tanks with Odor Control Covers

Secondary and Tertiary Treatment

Secondary & Tertiary treatment consists of biological phosphorous and nitrogen removal,based on the modified University of Cape Town (UCT) process. This is followed by twosecondary clarifiers, plus three low head sand media filters with automatic backwash.

Bioreactors


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Disinfection Method

Chlorination consists of three chlorine contact tanks followed by de-chlorination withSulphur Dioxide.

Chlorine Contact Tanks

Sludge Conditioning and Composting

Consists of the primary sludge being fermented, and then treated by anaerobic digesters.The methane gas produced by the digesters is used for plant buildings and sludge processheating. Mixed Liquor Suspended Solids (MLSS) is thickened in a settling tank (2%solids), gravity belt thickened(6%), belt filter press dewatered (13%) and then composted atour compost site at the landfill. Composting is by static pile aeration method, whichproduces a Class A compost. This conditioning / fertilizing product is recycled to CityParks, landscapers, the public and orchardists for agriculture use.


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Gravity Belt Thickener/Belt Filter Press

Effluent Irrigation SystemThe treated effluent can be stored in two emergency on-site 36,000 m3 storage basins forre-use. Irrigating with the effluent is done by three 60 hp 8 stage vertical turbine pumps.Maximum pumping capacity is approximately 100 l/sec. In 2007 603 ML went out forIrrigation, accounting for 12.2% of the total plant flow. The city currently irrigates thePenticton Golf and Country Club (29.1 hectares) and Kings Park (5.1 hectares).

Kings Park


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River OutfallIn 2007 the AWWTP discharged 4,415 Million Litres (ML) of effluent to the Okanaganriver channel. The AWWTP average effluent discharge flow to the Okanagan river channelin 2007 was 12.1 ML/day, compared to an average effluent discharge flow to the Okanaganriver channel of 10.8 ML/day in 2006.

Okanagan River Outfall

Plant StaffingThe plant staff includes one (1) Wastewater Foreman, two (2) Wastewater Operator IIIs,one (1) Wastewater Operator II, two (2) Wastewater Operator Is, one (1) OkanaganUniversity Water Quality Student, one (1) Millwright, one (1) Electrician, and theWastewater Treatment Supervisor.

Odour Control SystemsThree types of systems control plant odours. Odours are removed from the concretecovered fermenters, the fabric covered primary / equalization tanks by a positivedisplacement blower discharging into the bioreactor aeration system. Digester hoppers anddegrit building have odours removed by activated carbon canisters systems. The

Headworks area has a Sol-Air odour control unit which utilizes Ultraviolet light toneutralize odorous gases.

Process ControlThe Supervisory Control and Data Acquisition (SCADA) system consist of Wonderwaresoftware, controlled through Modicon programmable logic controllers. Alarms at the plantand lift station communicate through a wireless modem system.


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Effluent Quality

The treated effluent has less than 0.2 mg/l total phosphorous, less than 5 mg/l BOD andTSS, less than 1.0 mg/l ammonia as nitrogen, and fecal coliforms shall not exceed 2.2 MPNper 100mL. This quality of effluent is required to protect and preserve both the highlyvalued trout and kokanee spawning resource and the recreational value of the Okanaganriver channel.

Effluent Sample

2007 Completed Projects

The following repairs and replacement took place in 2007 for the Advanced WastewaterTreatment Plant:

Primary Tank #4 rebuilt ($8,359)Primary Tank #5 rebuilt ($8,359)Sludge conveyor relining ($2,429)Lakeside North pump rebuilt ($1,988)Wilson St. pump rebuilt ($1,875)

Staff Innovations for 2007

Installed washer and dryer to clean uniforms resulting in a $3,000-$4,000 / yearsavings over outsourcing of laundering.

Restructuring of the AWWTP staff, which included a new Foremans position todefine a clearer hierarchy was put in place in October and has worked well. In


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addition to aiding with attraction and retention, it also created two Operator IIIpositions.

Two new Suspended Solids meters were purchased and installed on the Bio-reactor,to help reduce the daily lab routine. These meters have also helped operationsunderstand what happens with solids throughout the day and night, as our grabsamples in the past were always taken at the same time.

BCWWA conference in Penticton with two staff members competing in Top Opschallenge.

Confined space entry/rescue , Hazard Identification/Risk Assessment and Chlorineleak response training by STC Consulting (Kelly Kaye). Two day course attendedby all WWTP staff.

Chlorine Leak Response Training

Conversion of a slide gate in the Chlorine Contact tank to an overflow gate was

envisioned and completed in house saving the purchase of a new gate.

Methane gas scrubber was designed by staff while viewing a similar scrubber inanother WWTP. This has allowed boiler cleaning intervals to increase by 300%.


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Purchase of a utility vehicle to allow staff to clean storage ponds safely andefficiently, has allowed the City to ensure that if required the storage ponds willperform as intended.

Cleaning of Emergency Storage Ponds

Planned Projects for 2008

The Wastewater Treatment Plant has $90,000.00 (Capital) budgeted this year forequipment repair/replacement. The following projects are scheduled:

Screens building roof replacement $15,000Replace Moyno pump press $16,000Replace one set of gas detectors $5,000Purchase one set of primary chains $12,000Replace primary tank odour tarp $2,000Replace sludge conveyor gear box $2,500Replace safety equipment $5,000

Tie in Digester to SCADA $20,000

For more information contact:Berne Udala, Wastewater Quality [email protected]

plants pent ict on 2008

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