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Mogden Sewage Treatment Works
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Mogden Sewage Treatment Works
Mogden Sewage Treatment Works is a sewage treatment plant in the Ivybridge section of Isleworth, west London, England, formerly known as Mogden. Built in 1931–36 by Middlesex County Council and now operated by Thames Water, it is the third largest sewage works in the United Kingdom. The site covers 55 hectares (140 acres).
It treats the waste water from three main sewers serving the northwest quarter of Outer London and two further ones from the south and south-west.
The Middlesex County Council Act 1931 is solely devoted to the scheme's construction and mitigations, comprising 78 sections and three schedules. Its work 1 is this works, works 2 to 5 are main sewers rising in Hendon, Uxbridge, Harrow and Staines. The Teddington main also connects, as fed into the new sewer 5d from works of Twickenham Corporation.
The sewerage district (catchment) was defined as those districts named after: Brentford & Chiswick, Ealing, Feltham, Harrow, Hayes & Harlington, Hendon (both), Heston & Isleworth, Kingsbury, Ruislip-Northwood, Southall-Norwood, Staines, Sunbury-on-Thames, Teddington, Uxbridge, Wealdstone, Wembley, Yiewsley & West Drayton. The second schedule lists the compulsory purchases by plan reference. The third schedule sets the minimum standard of purity of 30 ppm of suspended solids in treated effluent and secondly to "not take up more than" 20 ppm of dissolved oxygen in five days at 65 °F (18 °C).
The plant was built in 1931–36 for £1.7 million by Middlesex County Council, replacing 28 small sewage treatment facilities as part of the West Middlesex (Mogden-Perry Oaks) Main Drainage Scheme, which had a total estimated cost of £5.25 million (equivalent to £389,000,000 in 2024). The council enlarged the sewage operation at Mogden Farm, buying 101 acres (41 ha) of it, after the public and Duke of Northumberland objected to a Syon Park proposal. 110 kilometres (68 mi) of sewers were built to connect to it, and the Duke of Northumberland's River was straightened out as a source of coolant. The plant began operations in late 1935 and was formally opened with the rest of the scheme on 23 October 1936 by the then Minister of Health, Sir Kingsley Wood. In its first year of operation it treated an average of 60,020,000 gallons of sewage per day.
From 1935 the treatment facilities at Mogden comprised storm water tanks, primary sedimentation, sewage aeration, final separation and sludge digestion. The plant was designed to treat three million cubic metres per day of sewage.
The works were expanded in 1962, 1989 and 1991 and upgraded in 1996–2002. The 1962 extension included commutators, grit chambers and pre-aeration tanks, together with the following additional tanks.
The most recent expansion, in 2011–13, increased the treatment capacity by more than half and increased the plant's size by 19.5 hectares (48 acres), as part of the Thames Tideway Scheme to improve water quality in the River Thames. It was completed in summer 2013.
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Mogden Sewage Treatment Works
Mogden Sewage Treatment Works is a sewage treatment plant in the Ivybridge section of Isleworth, west London, England, formerly known as Mogden. Built in 1931–36 by Middlesex County Council and now operated by Thames Water, it is the third largest sewage works in the United Kingdom. The site covers 55 hectares (140 acres).
It treats the waste water from three main sewers serving the northwest quarter of Outer London and two further ones from the south and south-west.
The Middlesex County Council Act 1931 is solely devoted to the scheme's construction and mitigations, comprising 78 sections and three schedules. Its work 1 is this works, works 2 to 5 are main sewers rising in Hendon, Uxbridge, Harrow and Staines. The Teddington main also connects, as fed into the new sewer 5d from works of Twickenham Corporation.
The sewerage district (catchment) was defined as those districts named after: Brentford & Chiswick, Ealing, Feltham, Harrow, Hayes & Harlington, Hendon (both), Heston & Isleworth, Kingsbury, Ruislip-Northwood, Southall-Norwood, Staines, Sunbury-on-Thames, Teddington, Uxbridge, Wealdstone, Wembley, Yiewsley & West Drayton. The second schedule lists the compulsory purchases by plan reference. The third schedule sets the minimum standard of purity of 30 ppm of suspended solids in treated effluent and secondly to "not take up more than" 20 ppm of dissolved oxygen in five days at 65 °F (18 °C).
The plant was built in 1931–36 for £1.7 million by Middlesex County Council, replacing 28 small sewage treatment facilities as part of the West Middlesex (Mogden-Perry Oaks) Main Drainage Scheme, which had a total estimated cost of £5.25 million (equivalent to £389,000,000 in 2024). The council enlarged the sewage operation at Mogden Farm, buying 101 acres (41 ha) of it, after the public and Duke of Northumberland objected to a Syon Park proposal. 110 kilometres (68 mi) of sewers were built to connect to it, and the Duke of Northumberland's River was straightened out as a source of coolant. The plant began operations in late 1935 and was formally opened with the rest of the scheme on 23 October 1936 by the then Minister of Health, Sir Kingsley Wood. In its first year of operation it treated an average of 60,020,000 gallons of sewage per day.
From 1935 the treatment facilities at Mogden comprised storm water tanks, primary sedimentation, sewage aeration, final separation and sludge digestion. The plant was designed to treat three million cubic metres per day of sewage.
The works were expanded in 1962, 1989 and 1991 and upgraded in 1996–2002. The 1962 extension included commutators, grit chambers and pre-aeration tanks, together with the following additional tanks.
The most recent expansion, in 2011–13, increased the treatment capacity by more than half and increased the plant's size by 19.5 hectares (48 acres), as part of the Thames Tideway Scheme to improve water quality in the River Thames. It was completed in summer 2013.
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