Odour Improvement Project
Mogden Sewage Treatment Works Residents’ Liaison Meeting 26 September 2007 2
Odour Improvement Project � Scope 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 what 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. 3
Agenda 17:15 Site walk-around 18:15 1. Apologies 2. Odour Improvement Project 3. Odour 4. Mosquitoes 5. Working for a cleaner Thames 6. Further points raised by residents 7. Communications 8. Any other business and date of next meeting 20:15 Meeting Close 4
Progress of Works 5
East Works Progress AREA PROGRESS Inlet Penstocks 100% Screenhouse & Screens 90% Screenings Handling Plant 95% Grit Channels 70% Storm Weir 95% Grit Handling Plant 80% Storm Tanks 4 and 5 95% Circular PSTs (Decommission) 0% Rectangular SSTs 65% Odour Control Unit (Chemical) 100% 6
Screenings Handling Plant 7
CV Grit Channels 1 and 2 8
Storm Weir 9
Grit Handling Plant 10
Storm Tank 5 11
Secondary Settlement Tanks 2 & 3 12
Secondary Settlement Tank 4 13
Secondary Settlement Tank 1 14
East Odour Control Unit 15
West Works Progress AREA PROGRESS Chambers Upstream of Screens 100% Fine Screens 70% Cross Flow Grit Traps 95% Washpactors and Skip Loaders 100% Grit Handling Plant 70% Screw Pumps 100% Pre-Aeration Lanes 100% Odour Control Unit (Biological) 90% 16
Cross Flow Grit Traps 17
Pre-Aeration Lanes 18
Noise Update � Noise attenuator installed on 17 May 2007 (pictured) � Significant noise reduction on site � Final noise survey to be undertaken tonight (26/09/07), commencing at 9:00pm 19
Operation of Mogden- Update � Informative email notifications sent to residents: � 17 Proactive Notifications: � Odour Improvement project works (x12) � Site Maintenance works (x5) � 2 Reactive Notifications: � Interruption to Power Supply � Channel Cleaning 20
21 Complaints Received at Mogden 100 10 20 30 40 50 60 70 80 90 0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05 Nov-05 Dec-05 Jan-06 Feb-06 Mar-06 Apr-06 May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 Jan-07 N.B Figures reported to 31 August 07 Feb-07 Mar-07 Odour Odour and mosquitoes Mosquitoes Apr-07 May-07 Jun-07 Jul-07 Aug-07
Mosquitoes 22
Surveying and controlling Mosquitoes at Mogden � Strict year-round programme to survey and control mosquitoes � Summer surveying and treatment programme began in mid-April 07: � Weekly Surveys � Target Summer breeding sites � Mosquito treatment: � Less than two days after the weekly survey � Controls regular breeding sites & ad hoc sites as identified in the surveys � Spraying near standing water 23
Methods of Mosquito control at Mogden � Physical � Site housekeeping- Removing Mosquito breeding sites � Biological � Spraying Mosquito larvae with bacteria � Mechanical � Using ultraviolet insect traps � Chemical � Controlling adult Mosquitoes with pesticides 24
Number of sites inspected for Mosquitoes at Mogden 250 200 150 2003 2004 2005 2006 100 2007 50 0 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 25
Percentage of sites surveyed found to contain Mosquito activity 80 70 60 50 2003 2004 % 40 2005 2006 2007 30 20 10 0 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 26
Number of sites where larvae have been found 35 30 25 2003 20 2004 2005 2006 15 2007 10 5 0 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 27
Number of sites where Adult Mosquitoes have been found 14 12 10 2003 8 2004 2005 2006 6 2007 4 2 0 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 28
Mosquito Project 2007 � Project Scope: � Target the main over-wintering sites: � Digester galleries, aeration galleries, main pumping station drywell, power house basement & pumping stations 4 & 5 � Project aim: � To physically alter sites to reduce the number of places where Mosquitoes can breed and to make control work easier � Project commenced in March 2007 29
Working for a Cleaner Thames 30
Working for a cleaner Thames- Update � Proposed site improvement works: � Increase the amount of flow that can be fully treated � Less use of storm tanks � Includes new covered inlet works, covered primary tanks and new aeration lanes � Odour control of the new works � Reduce the likelihood of overflows from the works to the River Thames � To help boost oxygen levels in the tidal Thames � Improving the water quality and the habitants for aquatic life 31
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. Earth retaining wall. 32
Working for a cleaner Thames- Update � Timescales: � Planning Application: TBC- Delay due to finalisation of details � Proposed construction date: Spring/Summer 2008 � Complete and operational: Spring/Summer 2012 � Public displays were held in Isleworth Public Library on the 21 st , 22 nd and 24 th of May 2007: � Well received by local residents and businesses � Questions answered by Thames Water representatives � Comments Book completed 33
Further points raised by residents 34
Communication 35
Communication � E-mail notifications: � Informing residents of possible increase in odour � Mogden newsletter: � Updating residents with progress on the odour improvement project � To be distributed by end September/Beginning October 2007 � Mosquito Campaign: � ‘Help control mosquitoes in your area’ 36
Communication � Contact us about Mogden: � Via the customer centre: 0845 9200 800 � Through our website: www.thameswater.co.uk/mogden � By post: Thames Water, PO Box 436, Swindon, SN38 1TU � Visit our website: � Categorised ‘Answers to your questions’ webpage � Mogden weekly site log webpage (includes regular updates of the Odour Improvement project) 37
Thank You 38
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