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 Improvements at the Mogden Sewage Works

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David Harvey

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PostSubject: Improvements at the Mogden Sewage Works   Sun Aug 01, 2010 2:10 am

This is a press release from Thames Waters website regarding the commencement of work at Mogden.

17 June 2010
Improvement works to start at Mogden sewage works


Thames Water is due to start construction at Mogden Sewage Works in west London to improve sewage treatment standards and significantly reduce the amount of storm sewage that overflows into the River Thames during heavy rainfall.

Work is due to start on the £140m upgrade at Mogden
The first phase of the £140m upgrade involves reshaping and moving the western embankment to make way for new sewage treatment equipment.

Work on the embankment is expected to take up to six months. Thames Water will then landscape and replant the embankment with native trees and hedgerows later this year to create new habitats for wildlife.

Adrian Jack, Thames Water's Project Manager, said:
"The upgrade will enable Mogden to treat 50 per cent more sewage than at present, so it can better cope with heavy rainfall, helping to prevent the sewage works being overloaded and discharging into the river.

"These improvements will also help reduce odour at the site, as the use of storm tanks will be reduced and more of the existing equipment will be covered over."

Major upgrades will take place at Crossness, Beckton, Riverside and Long Reach sewage treatment works to increase the amount of sewage each site can treat, and improve the standards to which it is treated. The work is part of Thames Water's wider London Tideway Improvements programme, which includes the £600m Lee Tunnel project and the proposed Thames Tunnel to help provide a cleaner River Thames for all those who use and enjoy it.

The Mogden upgrade is due for completion in 2013.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Sun Aug 01, 2010 2:17 am

Excellent news for the Thames that the improvements are going ahead

One question I do have which seems to be reasonable, regards the extra amount of sewage they can treat.

'Significantly reduce the amount of storm sewage that overflows into the River Thames during heavy rainfall'

'The upgrade will enable Mogden to treat 50 per cent more sewage than at present, so it can better cope with heavy rainfall, helping to prevent the sewage works being overloaded and discharging into the river '

In the event of heavy down pours as seen in 2004, July and November 2009, how much sewage would still have to go into the Thames ?


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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Aug 06, 2010 2:29 pm

I've noticed some vile smells in the area lately, areas not usually covered by the hellish mist associated with mogden..does this mean they have finally started the works perhaps?? Any news appreciated
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Aug 06, 2010 3:44 pm

Hi Steve

From what I know they are first doing the work on the embankment so wouldnt have thought it should cause the stink. We will follow this up and let you know.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Aug 06, 2010 4:10 pm

Just for reference, this is a good link to the works at Mogden and the current status, can see nothing though relating to recent smells.

http://www.thameswater.co.uk/cps/rde/xchg/corp/hs.xsl/916.htm

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PostSubject: Re: Improvements at the Mogden Sewage Works   Mon Aug 09, 2010 10:13 pm

Steve I have had acknowledgment from the EA who are investigating and will report back any findings.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Thu Nov 18, 2010 5:53 pm

Update from Mogden...........


Over the next two years, our contractors, Black & Veatch, will be cleaning 13 of our sludge digester tanks in the south-west corner of Mogden SewageTreatment Works. T

his is part of our project to improve the works, significantly reducing the amount of partially-treated sewage that overflows into the River Thames following heavy rainfall.

We plan to start cleaning the first tank on Monday 22 November, and finish this by Friday 3 December, and are notifying you of this work as there is a small chance of an increase in odour during this time.

We apologise for any inconvenience that this may cause. We will issue further notifications for the remaining tanks.

Kind regards
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PostSubject: Re: Improvements at the Mogden Sewage Works   Mon Jan 10, 2011 8:45 pm

Mogden Update 6th Jan

The end of 2010 has been a challenging period for us on site. The bad weather has meant that many staff have been unable to get to work and deliveries have often been delayed. Sub-zero temperatures have also affected some of our machinery.

Despite this, work on the western embankment is essentially complete. Most of the dump trucks and excavators have now left site. Later in the project, we will remove a significant quantity of the soil that has been temporarily stored on top of the embankment. We will use it to fill around the new structures and extend the new embankment in the north-west corner of the site, where the construction offices are currently located.

Starting in January, we will drive over 2,000 concrete piles into the ground, which will act as foundations for a large reinforced concrete tank. There will be some
further piling for ten new final settlement tanks, which is likely to follow shortly after.

The piling work will cause some noise, for which we apologise. As all of this activity is taking place behind the western embankment, the mound will help reduce the impact. All piling activity will only take place from Monday to Friday, between 8am and 6pm. We will closely monitor noise and vibration with monitoring equipment.

We have been driving steel sheet piles into the ground, to enable us to safely start building some of the deeper reinforced concrete structures at the northern end of the site. This work will finish in mid-January.

Please note that there is no planned residents' drop-in session at the RFU (Rugby Football Union) in January. There will be future opportunities to meet members of the project team, view progress photos, ask questions and provide feedback, and we will update you once dates have been confirmed.

We will keep you fully updated on our progress. If you have any questions, please call 0845 641 0030, quoting 'Mogden'. Our lines are always open.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Mon Jan 10, 2011 8:46 pm

Another Update today

Dear Residents
The scraper on one of our west side primary settlement tanks has developed
a fault and requires repair. Before the maintenance team can carry out any
work, however, we need to empty the tank. We are giving 24 hours notice
and plan to drain down the tank tomorrow. (Tuesday)

We would like to apologise for any odour that residents may notice as a
result of this essential work.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Feb 18, 2011 10:33 pm

Update Today:

Dear

So far this year, our main activity has been creating the foundations for the additional sewage treatment tanks.

This involves hammering over 3,500 concrete piles into the ground. Despite the harsh weather over Christmas, we have already finished installing a quarter of these, and are still on target to finish the first phase in the spring. There will then be a break of about two months in the main piling activities while we work in another part of the site. We will resume the second phase of this work in the summer, which is likely to run into late autumn.

All of the steel piles have been installed, which was the noisier of the two piling activities.

Work has also begun on building a tunnel which will transport sewage entering the works to the new treatment tanks. We are using around 40 ready-made concrete sections that fit together end to end, which is a relatively quick and quiet technique.

All of this work is being carried out behind the western embankment, which helps to reduce the noise and visual impact. In addition, we are continuing to monitor noise and vibration levels, and avoid weekend working.

On Thursday 24 February, from 5pm to 7pm, you can meet members of the project team, view our plans, and provide any feedback at our next informal drop-in session at the RFU (Rugby Football Union). Free parking will be available in the main car park. On arrival
please report to reception at Rugby House Door A, situated in the South Stand.

We will continue to update you on our progress. In the meantime, if you have any questions, please call 0845 641 0030, quoting Mogden. Our lines are always open.

Thank you for your ongoing patience.

Kind regards
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Mar 18, 2011 9:11 pm

Dear Resident

Our work to upgrade Mogden is moving well, and with improving ground conditions now that winter is nearly over, we will be able to carry out some more work on the western embankment soon.

We are continuing to dig out the bases of the remaining sewage tanks, and so will need to temporarily store some more of the removed soil on top of the embankment as there is limited space elsewhere at the works. This will increase the height of the mound in the short term, but retaining this earth on site avoids up to 750 lorry movements in and out of Mogden each day.

The first two months of this activity is likely to be more noticeable from neighbouring properties, after which time, the scale of this work will reduce and be carried out intermittently.

We plan to gradually reduce the embankment to its final height by the end of 2012, and will shortly install marker posts to show the approximate level it will reach.

We are building the retaining walls for some of the treatment tanks from the soil dug out of the ground, mixed with the sand and gravel presently stored in front of the oak trees. This will reduce the amount of concrete imported to the site, and limit traffic on local roads.

Meanwhile, we are making good progress with creating the foundations for the additional treatment tanks, which involves pushing around 3,500 concrete piles into the ground. We have already completed around half of these, and plan to break from this activity in April. The final phase of this work will then resume in the summer, and is likely to run into late autumn.

We apologise for any disruption during this essential work, and, as always, will try and keep this to an absolute minimum.

On Thursday 24 March, from 5pm to 7pm, you can meet members of the project team, view our plans, and provide any feedback at our next informal drop-in session at the RFU (Rugby Football Union). Free parking will be available in the main car park. On arrival please report to reception at Rugby House Door A, situated in the South Stand.

We will continue to update you on our progress, but if you have any questions, please call 0845 641 0030, quoting ‘Mogden’. Our lines are always open.

Thank you for your ongoing support and patience.

Kind regards

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PostSubject: Re: Improvements at the Mogden Sewage Works   Sat Apr 16, 2011 10:25 pm

15/04/2011

Now that spring has finally arrived, finer weather and improved ground conditions mean we can do more on the western embankment. We can also concentrate on building the new treatment tanks.

During this upgrade, we are concerned about the impact of construction traffic on the roads around Mogden. To keep vehicle movements to a minimum, we will continue to temporarily store excavated soil on top of the embankment. This will continue to increase the height of the mound in the short term, but we estimate it will save up to 750 lorry movements each day. Customers living nearest to the works will be more aware of this. After two months, the work will reduce and become less frequent.

Excavated soil, together with sand and gravel stored in front of the oak trees, will be used to build up the retaining walls for some of the treatment tanks. Although temporary storage of soil will continue throughout 2011, we will reduce the embankment to its final height by the end of 2012.

We have finished half of the foundations for the additional treatment tanks, involving 3,500 concrete piles in the ground. The final phase of this work will restart in the summer, and is expected to be finished by the end of the year.
We apologise for any disruption during this essential work, and, as always, will try to keep this to an absolute minimum.

On Thursday 21 April, from 5pm to 7pm, you can meet members of the project team, view our plans, and provide any feedback at our next informal drop-in session at the RFU (Rugby Football Union). Free parking will be available in the main car park. On arrival please report to reception at Rugby House Door A, situated in the South Stand.

We will continue to update you on our progress, but if you have any questions, please call 0845 641 0030, quoting 'Mogden'. Our lines are always open.

Thank you for your ongoing support and patience.

Kind regards
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Jun 24, 2011 6:21 pm

Dear Resident

As we approach the end of the first year of construction, our work to upgrade Mogden is really starting to take shape.

Behind the western embankment, a 200-strong workforce is making great progress in building the new extension to the works - which will significantly reduce partially-treated sewage overflowing into the River Thames following heavy rain.

Around three-quarters of the foundations for the additional treatment tanks are now complete, and we are nearly half way through building the concrete structures. This means we will soon be able to install the machinery which will make these tanks work.

We have started using the gravel stored in the north-west corner of the site, near Worton Industrial Estate, to fill around the new structures. We plan to start using the remaining soil temporarily stored on top of the embankment in spring 2012, which will reduce the embankment to its final height by the end of next year.

During July we will start the final sections of foundation work. This will continue into the autumn, with short intermittent breaks throughout this period. As this activity involves hammering concrete piles into the ground, it can generate noise and vibration, which we will monitor closely and keep to an absolute minimum.

Working hours for the main construction activities will continue to be limited to between 8am and 6pm, Monday to Friday.


We apologise in advance for any disruption during this time, and thank you for your ongoing patience during this essential work.

On Thursday 30 June, from 5.30pm to 7pm, you can meet members of the project team, view our plans, and provide any feedback at our next informal drop-in session at Twickenham Stadium. Free parking will be available in the main car park. On arrival please report to reception at Rugby House Door A, situated in the South Stand.

We will continue to update you on our progress, but if you have any questions, please call 0845 641 0030, quoting 'Mogden'. Our lines are always open.
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PostSubject: Re: Improvements at the Mogden Sewage Works   Tue Aug 02, 2011 7:04 pm

Dear Resident

As part of our work to improve Mogden Sewage Treatment Works, our contractors Black & Veatch will be demolishing one of the concrete tanks located in the north-west corner of the site.

Before this work can take place, we need to clear the tank of grit. We plan to start this work on Thursday 4 August, and expect it will last around eight days.

We are notifying you of this work because there is a chance that you may notice a slight increase in odour during this period. We apologise in advance for any inconvenience.

Kind regards
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PostSubject: Re: Improvements at the Mogden Sewage Works   Wed Aug 03, 2011 7:15 am

bloody hell m8, thats some kind of supa dupa grit if it gives of an increase in odour
any chance of putting some on the bank where the illegally moored boats are
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PostSubject: Re: Improvements at the Mogden Sewage Works   Wed Aug 03, 2011 11:56 am

Smile
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Aug 19, 2011 3:06 pm

Dear Resident

As part of our upgrade works at Mogden, our contractors, Black & Veatch,are cleaning 13 of our sludge digester tanks in the south-west corner ofthe site. This work is underway, and the first three tanks have been done.

We plan to start working on the fourth tank on Monday 22 August 2011 and have itcompleted by Friday 2 September 2011. We are notifying you of this work as there is a small chance of an increasein odour during this time.

We would like to apologise in advance for anyinconvenience that this may cause. We will issue further notifications for the remaining 9 tanks, which willbe complete by the end of 2012. With kind regards
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PostSubject: Re: Improvements at the Mogden Sewage Works   Mon Aug 22, 2011 10:28 pm

Dear Resident

We are now into our second year of construction to improve Mogden Sewage Treatment Works, and have already built more than half of the additional treatment tanks.

This puts us firmly on track to increase the site’s capacity by 50 per cent by March 2013, which will reduce the amount of sewage that overflows into the River Thames after heavy rain.

Our good progress has allowed us to start installing the machinery for two of the four key treatment areas being extended, which means they will be in use at the beginning of next year.

At the inlet works, we have installed screens that will remove from the incoming sewage items like nappies and other materials that should not be flushed down the toilet. The flow of sewage is then slowed in the primary settlement tanks, where we have put in place the equipment that will remove the heavy particles that settle to the bottom.

We have also built two of the five new aeration lanes, where we bubble air through the sewage to encourage bacteria to eat the organic matter.

In addition, we have recently started building the foundations for the ten new final settlement tanks, where any remaining solids are removed before the cleaned effluent is safely returned to the river. This activity will continue into the autumn, and can generate noise and vibration, as it involves hammering 1,700 concrete piles into the ground.

Working hours for the main construction activities will continue to be limited to between 8am and 6pm, Monday to Friday.


Thank you for bearing with us while we carry out this essential work. We apologise for any inconvenience it may cause.

On Thursday 25 August, from 5.30pm to 7pm, you can meet members of the project team, view our plans, and provide any feedback at our next informal drop-in session at Twickenham Stadium. Free parking will be available in the main car park. On arrival please report to reception at Rugby House Door A, situated in the South Stand.

We will continue to update you on our progress, but if you have any questions please call 0845 641 0030, quoting 'Mogden'. Our lines are always open.

Kind regards


If anyone fancies going down this Thursday, it is an open house
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PostSubject: Re: Improvements at the Mogden Sewage Works   Fri Aug 26, 2011 8:26 am

My wife and I went along to Twickenham Stadium yesterday and met a couple of people from Thames Water and a chap who was works for the primary contractor running the project to expand the site capacity. Amazingly, we were the only visitors there from 6 - 7 pm! These meetings are held monthly and intended as an update for local residents but if I had said we were coming they would have brought more materials of interest to us.

This left us free to get a good overview of how the plant works and what the expansion work involves. From the area and size taken up by the new expansion works, one would guess that it might increase capacity by 20-25% at best. But we were assured that being more modern and deeper the new facilities will increase capacity by 50%. They reckon that will be sufficient to deal with all domestic waste AND all storm surge events. The work will be complete and plant operational by March 2013.

How it works...
There are 2 sewage supplies to Mogden, the "shallow" one from the West comes down under the A4 arrives more or less at surface level and the "deep" one from the South which is over 30m down, they have pumps to lift this up to the first stage which is screening. Everything over 6mm diameter is removed here, branches, bricks, nappies, sanitary towels, you name it. Dental floss can be a bit of a problem as it can go through but not always. The screened material is skipped and sent to landfill, So bin all those things please folks, not down the loo - it will go to landfill eventually just the same!

Now we have watery sewage with grit, by running it through a tank at a precise flow rate over a certain distance, the grit drops to the bottom. These tanks are periodically scraped out, this grit is recycled as a material for building eg. roads.

Grit-free sewage now passes in to the airation tanks where air is bubbled up through to stimulate the breakdown of the organic matter by organisms such as bacteria, nematode worms and snails.

This passes to settlement tanks where the suspended treated substances are allowed to settle out to the bottom. The top layer is now clear treated water. Whilst not regarded as drinkable, it is of the quality of river water. It flows over a weir at the edge of the settlement tank, round in to a culvert and back out to the Thames at Isleworth Ait. This is what can be seen billowing up under the surface there continuously during normal operation.

Because the treatment cycle (airation plus settlement) is quicker than the lifecycle of the organisms doing the job, some of the sludge from the bottom of the settlement tank is pumped back round in to the airation tanks to maintain the numbers of them in those tanks. Otherwise they'd all eventually be washed out. The remainder of that sludge goes to a sludge tank where it is pasteurised at 70 deg.C, concentrated in centrifugal spinners, then pumped back to a sludge treament works at Colnbrook just beyond Heathrow Airport (it was previously located where T5 has now been built - BAA paid them enough for that land to build a new plant there!). The pipes for this actually run in the top of the main sewer under the A4, this has the benefit that if there is a problem (leak) the material simply comes straight back to Mogden via that sewer!
That material is further treated at Colnbrook to create something which can be used as fertilizer by farmers and spread directly on the land.

During the pasteurization cycle quantities of biogas (methane, ammonia, hydrogen sulphide) are given off. These are used to generate electricity, typically around 5MW. The plant needs up to 10MW to operate so that doesn't supply all its needs. In fact, because of the bizarre pricing of feed-in-tariffs they resell ALL the electricity they generate back to the grid and buy ALL that they need from the grid, they do better from it financially that way. Crazy but true!

The above is during normal operation of the plant. During a storm surge they simply cannot cope with the inflow. It still passes through the 6mm screens but then begins to fill storm tanks starting at Nos. 4 & 5 which are covered because of the odour and subsequently filling the others. After the storm these tanks are emptied by pumping back round to the start of the normal cycle. Organic matter should have settled somewhat in these tanks. Worst case is when there are repeated storms, if these tanks are already full there will be a discharge event. The EA monitor the output from Mogden and there is a unit which can add Hydrogen Peroxide to the waste before it leaves the plant in these circumstances.

They are confident that the increased capacity is sufficient that that they will be able to deal with such storm surges in future and those kinds of discharges will no longer be necessary. What that DOESN'T address is the CSOs (Combined Sewage Outlets) such as at Hammersmith which simply discharge unscreened untreated sewage directly. It MAY be that those discharges become less likely because more of that could be directed to Mogden but we'd need to seek clarification on this.

A very interesting and informative hour and raises a number of new questions. I swapped contact details with them so if we get something together we can get more answers. Also feel it is worth following up how TW / EA interface with one another, our guess is TW don't do anything extra unless the EA tell them to do so...



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PostSubject: Re: Improvements at the Mogden Sewage Works   Mon Sep 26, 2011 8:28 am

We visited the Kempton Steam Engine Trust yesterday. This is the large water-works pump house situated alongside the A316, http://www.kemptonsteam.org/
Inside the pump house are two giant steam pumping engines 4 stories high. They were installed by the Metropolitan Water Board in 1928. From 1929 until 1980 they ran 24 hours a day. The interesting part as far as we are concerned (I thought) was the explanation of the job they actually did (and which is now done by electric pumps situated on the same site).
This is the other side of our water system, before it becomes sewage. Water abstracted at Laleham is fed in to the Queen Mary resevoir. It flows from there by gravity down to the Kempton filter beds where it passes through screens (to remove leaves, sticks, dead animals etc.) then through gravel, sand and charcoal filter beds. Finally it is chlorinated which renders it good enough for drinking. The water is too low down to supply London directly, the water has to be lifted up about 200 feet so it will run out of the taps in all the houses in North-West London. The pumps push it all the way up to resevoirs at Cricklewood, about 19 million litres a day. Any filtered sludge is pumped to Mogden for treatment.
There is another pumping station at Kew Bridge (now Kew Bridge steam museum), it originally abstracted water directly from the Thames nearby. As we all know the water down there is filthy. In 1852 an Act of Parliament was passed which said that water abstracted for drinking may only be taken from the non-tidal river. So abstraction just upstream of Teddington Lock began, a new pipeline was laid from Teddington Lock to Kew in order to keep that water works running.


Last edited by EdRandall on Mon Sep 26, 2011 5:50 pm; edited 1 time in total
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Ed Randall

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PostSubject: Poo flakes   Tue Sep 27, 2011 8:21 am

This is what they do with the sludge after Mogden has finished with it.
http://www.bbc.co.uk/news/uk-england-berkshire-15058397
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David Harvey

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PostSubject: Re: Improvements at the Mogden Sewage Works   Tue Jan 17, 2012 3:36 am

Dear Customer

January is an important month for the team improving Mogden Sewage Treatment Works, as it heralds the start of our final year of construction and installation work.

We continue to work hard to increase the site’s capacity by 50 per cent by March next year, which will reduce the amount of sewage that overflows into the River Thames after heavy rain.
The focus of our work in the next month will be pushing ahead with the mechanical and electrical work for the new inlet works, where sewage enters the site and is screened to remove large objects. We will also be working on the new odour control plant, and some of the new primary tanks, where heavy particles are removed from the sewage.

Together, these elements will be commissioned in the spring as part of the first phase of putting the site into full operational service.

You may have noticed recent work to install the chimney of the odour control plant, located at the northern end of the site. This will mostly be hidden from view once we have completed work on the embankment and associated planting.

Our workforce will shortly start removing the earth temporarily placed on the mound, meaning the embankment will be back to its original height by the end of this year.


Thank you for bearing with us while we carry out this essential work. We apologise for any inconvenience it may cause.

On Thursday 26 January, from 5pm to 6.30pm, you can meet members of the project team, view our plans, and provide any feedback at our informal drop-in session. This will be held at a new venue − the BridgeLink Centre in Summerwood Road, Isleworth, TW7 7QR. Free parking will be available in the centre’s car park.

We will continue to update you on our progress, but if you have any questions please call 0845 641 0030, quoting 'Mogden'. Our lines are always open.

We would like to take this opportunity to wish all our neighbours the very best for 2012.

Kind regards
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Andy Banham

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PostSubject: improvements at mogden sewage works   Wed Jan 18, 2012 9:15 pm

hi all will the disaster on june 6th 2011 be prevented from happening again? will they continue to dump raw sewage into the thames but not as much? 50% is a big improvement is this wishful thinking? sorry for all the questions however from fishing barnes twice and the strand once i would like to know.
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David Harvey

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PostSubject: Re: Improvements at the Mogden Sewage Works   Wed Jan 18, 2012 10:18 pm

Keep firing the questions mate, happy to answer if we can.

Mogden will make a difference as is the last sewage outlet on the western end of the tideway. In terms of how much it pumps out compared to the bigger picture, the figures below are from the last 6 months

Hammersmith
1,995,150

Mogden
2,117,300

Western (Albert Bridge)
2,326,525

Lots Road (SW6)
1,044,140

So it will remove a significant amount which is excellent but bigger picture, is only a fraction of the whole river.

Bear in mind these are only the monitored pumping stations out of 54 CSO's in total.

What it will mean is that the impact is no longer seen as upstream as before which is very good news.

In terms of a big fish kill, if we have a dry spring again then a storm in late May/June, sadly pictures maybe the same. Reason being is that all the sewage sits festering and just doing its normal thing. A big flush spews it into the river, the warmer weather means the oxygen levels are much lower, so hence the impact much higher.

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PostSubject: Re: Improvements at the Mogden Sewage Works   Thu Jan 19, 2012 12:19 am

Saw sewage being pumped out the other night in Kingston town centre from the car park just down from the Slug and Andy Shaw has seen it coming from right by Kingston bridge on the other side, where the futuristic silver houseboats are. Despite my involvement with the club, I didn't realise sewage was being pumped into the non-tidal like that. Gutted Sad

And this was when there was zero rain for the last day or so.
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