Odour-busting changes are being made at Mogden Sewage Treatment Works.
New sensors are being installed in digesters at the plant in Isleworth, machines which produce bio-gas from sewage.
The site's operator Thames Water is also testing a new form of 'anti-foam' around the seals of the tanks, which it hopes will prevent sewage foaming up and causing a stench for neighbouring residents.
The work, which is due to be completed by the end of April next year, is part of a deal between Thames Water and Hounslow Council made at a recent meeting.
Thames Water has also agreed to investigate how odour can be reduced from the feed channels serving the storm water tanks.
A major upgrade of Mogden was completed in May this year, boosting capacity by 50 per cent, which Thames Water claimed should help reduce the pong escaping the site.
However, Mogden Residents Action Group (MRAG) claimed the smell this summer was worse than ever and its complaints led the council to reinstate its 24-hour hotline for residents to report odours.
Deputy council leader Colin Ellar said: "I am glad to announce that after these positive talks, Thames Water, as a good neighbour, has agreed to put these new improvements in place. As a council we are determined to do all we can within our power to improve the quality of life of our residents."
A Thames Water spokeswoman said: "We know odour is major concern to people, and we will continue to work with the council and residents groups to explore new ways of managing this issue
"Our new upgrade to the site is working well, with many parts of the works now covered and odour controlled. This should help reduce likelihood of nasty smells coming from our site."
* You can call the council's Mogden hotline on 020 8583 2000 to report odours from the site, which will be investigated by an officer.