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 just hope we are not flanked by a sewage farm and a building site.
I've got an old map which shows Finham village on the site of the sewage farm, which is nearer Stoneleigh.
A plant can be next to a sewage farm, a corporation waste site or next to a paper mill.
Top of the list is Arumnigrum with its sinister black spathes and a scent like a sewage farm on a hot day.
Tenders are invited for Coimbatore Corporation-Supply, Installation,Commissioning,Operation and Maintenance of Solar Power Plant at Ukkadam Sewage Farm Premises in CCMC
Contrarily, a recent sighting included a pair of White Tailed Eagles, the RSPB's symbol, which were spotted over a Dewsbury sewage farm, proving to be a great discovery for the Huddersfield twitchers.
I'm sad the European Union has become a sewage farm of bad ideas, double- dealing and deceit.
The thing I remember most about the stage around Esholt sewage farm in Bradford was the smell.
In a career spanning more than five decades, Moncrieff has followed the country's leading politicians across the globe, from observing Margaret Thatcher's visit of a sewage farm in Cairo, to John Major's tour of the Orient.
Thankfully one of the troops proved to be a good navigator and we made it to Twickenham via a ten-minute walk through a gut-wrenching Thames Water sewage farm.
Tenders are invited for Development of Sewage Farm Road