Mogden Sewage Treatment Works - Thames Water · Mogden Sewage Treatment Works ... Mosquitoes...
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Thames Water Mogden Sewage Treatment Works Residents’ Liaison Meeting 17 th September 2008
Transcript of Mogden Sewage Treatment Works - Thames Water · Mogden Sewage Treatment Works ... Mosquitoes...
Thames Water
Mogden Sewage Treatment Works
Residents’ Liaison Meeting
17th September 2008
Thames Water
16:30 Site Tour
17:30 Mogden Residents’ Liaison Meeting
Apologies
Odour Improvement Project
Odour
Working for a cleaner River Thames
Mosquitoes
Communications
Any Other Business
Proposed date for next meeting
19:15 Meeting Close
Agenda
Thames Water
Odour Improvement Project
Thames Water
Odour Improvement ProjectScope of Work:
Cover Key Parts of the treatment process, including:
Inlet Works (East and West side of Mogden)
Primary Settlement Tanks (East Side)
Two Storm Tanks (East Side)
Independent tests have been used to decide which areas of the site to cover
Install equipment to extract and treat the odorous air from the covered areas:
Two new odour control units (East and West side)
Designed to robustly comply with the requirements of the odour abatement notice
Thames Water
Odour Improvement Project
Thames Water
Screen House (East) Screen Handling Plant and Screening Sump (East)
Odour Improvement Project
Thames Water
Screen Conveyors (East)
Washpactors and Screening Skips (East)
Odour Improvement Project
Thames Water
Pre-Aeration Lanes (West)
Fine Screens (West)
Odour Improvement Project
Thames Water
CV Grit Channels and Dredgers (East)
Cross Flow Grit Traps (West)
Grit Skip Enclosure (East)
Grit Skip Enclosure (West)
Odour Improvement Project
Thames Water
Storm Weir (East) Storm Tanks 4 & 5 (East)
Odour Improvement Project
Thames Water
Primary tanks (West)
Odour Improvement Project
Thames Water
Odour Control Unit (East)
Odour Control Unit (West)
Odour Improvement Project
Thames Water
What are we planning to achieve?
We included investment to reduce odour at Mogden in our business plan, submitted to our regulator, OFWAT at our last price review (2004)
In their price determination in 2005 OFWAT allowed us to increase bills to customers in order to fund Mogden odour improvements. This was based on a 66% reduction of odour (measured against the 2003 odour survey).
In September 2008, OdourNet will be carrying out an odour survey to see if we have met the required reduction of odour.
Thames Water
Operation of Mogden- Update
Informative email notifications sent to residents (Apr – Sept 08)
11 Proactive Notifications:
Odour Improvement project works (x1)
Site maintenance / cleaning works (x7)
Plant trials (x1)
1 Reactive Notification
A sludge spill in May
Thames Water
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OtherMosquitoesOdour and mosquitoesOdour
Complaints Received at Mogden
Thames Water
Working for a cleaner Thames- Update
Thames Water is investing in improving the water quality of the Tidal River Thames; for the ecology that thrives there, and everyone who uses and enjoys it
The proposed site improvements will enable Mogden STW to cope better with increased flows caused by heavy periods of rain, or ‘storm conditions’
This will mean a significant reduction in the need to discharge any untreated wastewater into the River Thames
The improvements will also mean less use of the existing storm tanks
The scope of works include:
A new, covered inlet works
New, covered primary tanks
New aeration lanes
The new works will be odour neutral
A planning application was submitted to LB Hounslow in May 2008
Thames Water
Preferred Solution for Mogden
Area of development.
Other land in applicants ownership.
Buildings.
Site roads / hardstanding.
Above ground structures.
New & re-profiled embankment.
Soft landscaped areas.
Thames Water
Mosquitoes
Thames Water
We operate a strict all year-round mosquito survey and control programme
In 2007 Thames Water launched a mosquito project that focussed on physically altering breeding sites at Mogden STW. The project also improved access to the breeding areas for surveying and control.
Identifying breeding sites
Surveys are carried out on a weekly basis by external experts in mosquito identification
The number of sites surveyed vary with mosquito breeding patterns
Winter – up to 60 sites
Summer - up to 160 sites
Controlling Mosquitoes at Mogden
Thames Water
Control
We use a number of different methods to control mosquitoes
Physical - Removing stagnant water breeding sites, for example unblocking drains.
Biological - Using natural methods of control such as bacterial spraying of larvae
Mechanical - Using ultraviolet light traps that ‘zap’ insects with a high voltage electric shock
Chemicals - Using pesticides to kill adult mosquitoes
Regular control measures are implemented less than 2 days afterthe surveys are carried out
Education and Communication
We have been working with the local authorities on this year’s mosquito advice leaflet. Copies were sent to over 17,000 local residents.
More information can be found on our website
Thames Water
Number of sites inspected for Mosquitoes at Mogden
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0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52Week of year
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Thames Water
Percentage of sites surveyed, found to contain Mosquito activity
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Thames Water
Number of sites where larvae have been found
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Thames Water
Number of sites where Adult Mosquitoes have been found
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
Week
200320042005200620072008
Thames Water
Thames Water
Communication
Thames Water
Communications
E-Mail notifications
Informing residents of possible increase in odour
Mogden Newsletter:
Updating residents with site news and progress on the Odour Improvement Project
Mosquito Campaign:
‘Help control mosquitoes in your area’
Thames Water
Find out more…
There are a number of ways of contacting us to find out more information
Call our Customer Centre, our lines are always open
0845 9200 800
Visit our regularly updated website
www.thameswater.co.uk/mogden
Send a letter to
Thames Water
PO Box 463
Swindon
SN38 1TU
Thames Water
Any Other Business
Proposed Date of Next Meeting-December 2008
Thames Water
Additional mosquito data slides
Thames Water
Number of sites inspected
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AVG 03 - 07 YTD 2008
Thames Water
Percntage of sites showing any activity
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Thames Water
Percentage of sites where many adults have been found
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AVG 03 - 07 YTD 2008
Thames Water
Percentage of sites where larvae have been found
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AVG 03 - 07 YTD 2008
