sewage treatment

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sewage treatment

the treatment of raw sewage to make it harmless for discharge into rivers, seas and oceans. Treatment systems may involve
  1. (a) Primary treatment in which physical methods are used to remove solid matter (primary sludge) from the waste-water.
  2. (b) Secondary treatment in which biological methods, involving a range of aerobic bacteria, are used to degrade the organic matter in the waste-water. The treated sewage may then be disinfected before discharge from the sewage plant. The sludge that accumulates during both primary and secondary treatments is acted on by anaerobic bacteria in an anaerobic sludge digester. The methane produced can be used as a fuel for heating the digester, whilst the treated sludge is dried and may be used as a fertilizer.
  3. (c) Tertiary treatment in which chemical and physical methods are generally used to remove all the biochemical oxygen demand (BOD), nitrogen and phosphorus. After this treatment the water is disinfected and can be pumped direct into reservoirs. However, tertiary treatment is an expensive process, so water is often returned to the environment after secondary treatment.
References in periodicals archive ?
I made a point of meeting the winner of the latter lot, simply because I'd never come across anyone who dreams about sewage farm tours before.
He said: 'I've lived here alongside the sewage farm for 38 years and it's never been as bad as this.
It is no secret that we opposed GAT when they gave the go-ahead for Welsh Water to build a sewage farm at Llanfaes on the site of the royal burial ground.
Lewis may well one day emulate the ability of Spall, who you feel could walk through the contents of a sewage farm and provoke plaudits.
1 and replacement of gear and bearing of gate valve of inlet chamber at 90mld sewage pumping station at gwalior sewage farm
IF YOU went to see a film set in a sewage farm you could happily accept that you'd just spent pounds 5 to watch filth.
If I picked a villa that was flanked by a sewage farm on one side and a building site on the other, then we would have to live with it.
If the land was situated in an area which may have been contaminated, for example a petrol station, sewage farm, light industrial unit, brickworks, railway, town gas works site or close to a water course, then an environmental search should be conducted.
Abandoned ZENA and her gorgeous four-month-old foal WARRIOR were found dumped in a field just yards from a sewage farm in Norfolk.
The workers at a sewage farm in Canterbury Road, Ashford, spotted it in the nearby River Stour, which had flooded.