stormsaver.com rainwater reclamation cpd seminar presented by matthew tickle to suffolk and essex...
TRANSCRIPT
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stormsaver.com
Rainwater Reclamation CPD SeminarPresented by Matthew Tickle
to
Suffolk and Essex
Energy & Environment Group
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stormsaver.com
Stormsaver Manufacturer and supplier of Stormsaver rainwater recovery systems
Solve drainage problems, minimise localised flood risks and save money by recycling rainwater which would otherwise go to drain.
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Presentation Overview Rainwater Facts
Typical uses
Lessons from Germany
Typical Installation and Filtration
Amount of Water to Collect
Payback and Case Studies
Why use a Specialist
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Rainwater Facts There is 18 times more rainfall in the UK than the net consumption of the
population – more than enough for our needs!
When combined with attenuation, rainwater recovery helps to reduce potential flood risks. Synergy with Sustainable Drainage Scheme (SDS)
Up to 50% of water in most commercial, domestic or industrial applications can be supplied by rainwater rather than mains water
Rainwater is FREE – save money on your water bill.
Positive impact on the environment – BREEAM Points
Utilising recycled rainwater helps to reduce potential water shortages.
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Rainwater or Grey water ? RainwaterOriginal source of all water supplies. Reservoirs,rivers,aquifers.Rainwater systems collect water from roof and/or surrounding area before it drains away.
Grey waterWastewater from sinks, baths, showers, domestic appliances, except sink and dishwasher wastewater.System collects water before it reaches the sewer/drain.
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Typical uses in a Domestic /Commercial building
Recycled rainwater can be used for;
Garden watering
Vehicle washing
Toilet flushing
Urinal flushing
Washing machines
Property cleaning (window washing, hosing down)
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Lessons from Germany
Mains water costs are 2-3 times higher. Rainwater systems for 15 –20 years >2,300,000 systems installed. Mandatory installation in some areas for new builds. Subsidies available up to £1000/system
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Rainwater collected from roof area Pre-tank filter
Stormsaver® storage tankInlet calmerSubmersible pump Floating suction filterLevel sensorsStormsaver® rain processor unitStormsaver® header tankMains water top-up
General design and installation principles
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Disinfection.
UV – requires low turbidity, removal of particles to prevent sheltering of organisms. On all the time.
Electricity costs and replacement bulbs costly : ~ 200 kWh per year : more economic the more water is treated.
Ionisation : Trace elements used to sterilise water, lower energy costs, replacement electrodes.
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Filtration Filtration is key to good water quality. “prevention or removal of organic debris before storing
rainwater was found to be important in maintaining good
water quality” BSRIA TN 7/2001.
3 stage process : Stage 1 : pre tank 440 micronsStage 2 : pump 180 micronsStage 3 : processor 35 microns
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How much water is collected ? The larger the roof area and the demand, the greater the
financial savings.
Vol. Collected m3 = roof area m2 x ave. annual rainfall x collection co-efficient x filtration co-efficient
Pitched ~ 90%Flat ~50%
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Information required to size a system
What is the usable roof area? What is the type of building? School, prison, residential etc. What is the site post code / location? What is the demand of the building? Either in L/S, number of W/C’s
or occupancy. Also what are the operating hours? What is the type of roof drainage? Syphonic or gravity. If syphonic
what is the flow rate? Is there room for a header tank or will it require a pressure boosted
system? Do you require UV Disinfection?
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Other Considerations
A syphonic break is required before the pre tank filter if building has a syphonic roof drainage system such as Fullflow.
Fall across pre tank filter and tank- 400mm.
Rainwater recovery systems do require a degree of maintenance.
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Savings and payback‘Reduce the spiraling cost of water’
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Cost of water is increasing as demand for supply increases.
Most commercial systems see an efficiency of between 50-75%
Return on capital cost and installation usually within 5-10 years
Enhanced Capital Allowance (ECA) approved
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Case Studies
Application Crate Wash
Roof Area 5900 sqm
Demand 25m3/day
Efficiency 51%
Saving p/a £8390
Location Scotland
ASDA – Falkirk, Scotland
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Case Studies
Application WCs
Roof Area 1918 sqm
Occupants 450
Efficiency 41%
Saving p/a £1245
Location Dorset
Conifers School, Weymouth
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Case Studies
Application WCs
Roof Area 17000 sqm
Occupants 3000
Efficiency 62%
Saving p/a £15,770
Location Scotland
Royal Bank of Scotland HQ
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Useful publications “Rainwater and grey water use in buildings – best
practice guidance” 2001 : CIRIA C539
“Rainwater and grey water in buildings – project report and case studies.”2001 : BSRIA TN7/2001
CIRIA Research Project 555 – SUDS
WRAS: Guidance Notes: 1999- 9-02-04 and 9-02-05
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Using a rainwater recovery specialist
Consultation with architects, consultants, mechanical engineers Bespoke design Site surveys / visits during installation. System commissioning Full service and maintenance contracts
Our friendly, fully trained technical staff offer support before, during and after installation
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Presentation Review Rainwater Facts
Typical uses
Lessons from Germany
Typical Installation
Filtration
Amount of Water to Collect
Payback
Case Studies
Why use a Specialist
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StormsaverStormsaver would like to thank you for the
opportunity to speak at this event and look forward to answering any of your questions.
Visit our web site at www.stormsaver.com