- Maple Cross
Maple Cross shown within Hertfordshire
Population 2,000 (approx) OS grid reference District Three Rivers Shire county Hertfordshire Region East Country England Sovereign state United Kingdom Post town RICKMANSWORTH Postcode district WD3 9 Dialling code 01923 Police Hertfordshire Fire Hertfordshire Ambulance East of England EU Parliament East of England UK Parliament South West Hertfordshire List of places: UK • England • Hertfordshire
Maple Cross is a village in Hertfordshire, England with a large proportion of the housing being either council owned or previously council owned. The area is served by junction 17 of the M25 motorway, which makes up one of the boundaries of the village. It lies about 8 kilometres (5.0 mi) west of Watford.
Many multi-national businesses have offices here, including Nissan, Renault, and the UK headquarters of construction company Skanska.
Maple Cross has one school, Maple Cross JMI, located on the main thoroughfare, Denham Way. Secondary education is generally provided for in Rickmansworth, Watford or Harefield (London).
The area is served by the Greenline route 724 which runs from Heathrow Airport to Harlow, Essex via Watford and the local Arriva #6 which begins in Maple Cross and runs to Hemel Hempstead via Watford. The bus route R21 runs from Mount Vernon Hospital via Harefield and Rickmansworth. It normally terminates at Maple Cross, but extends its journey to Uxbridge twice per day via Denham.
Sewage treatment plant
Maple Cross is the location of the Thames Water Maple Lodge Sewage Treatment Works. The plant, with its sister site at Blackbirds Farm in Aldenham serve the whole of West Hertfordshire; an area with a population of 557,000 people.
The sewage plant's claim to fame is its use as a storage facility for perfluorooctane sulfonate (PFOS) used to extinguish the fire at the Buncefield Oil Terminal. Sludge from the plant was also burnt to generate "green" electricity for the Millennium Dome.
The plant was used in 1952 to test diffused aeration technology and a diffused-air activated sludge purification system has been in continuous use since. The cleaned effluent from this process is discharged into the nearby Grand Union Canal.
Sludge settled from the incoming sewage is treated by retention in enclosed heated anaerobic digestion tanks, a by-product of this process being methane gas which is used for on-site electrical power generation. The main product, digested sludge, is "caked" in industrial centrifuges before disposal to land as fertiliser.
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