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 ?
Haridwar generates an estimated 114 MLD of sewage, but its existing three sewage treatment plants at Jagjeetpur and Sarai are able to treat only 63 MLD of sewage, while the remaining discharges directly into river Ganga.
Faced with the alarming fact that over 60% of the sewage generated in our country goes untreated, with its negative effect on human health, the government is focusing on waste management through centralized sewage treatment plants and by mandating large upcoming real estate projects to have their own treatment facility.
Although the sewage treatment works reduce the potential for such problems, it is important that people handle all waste responsibly.
The second phase of the project includes construction of a Thermal Drying Plant (TDP) to process sludge from the sewage treatment plant.
Investigating officers also saw the hotel's sewage treatment plant was poorly maintained.
The Al Ansab project is to construct a sewage treatment plant with a daily capacity of 50,000 tonnes.
There will be successively dozens of construction projects for township sewage treatment in Yangchun City.
A groundwater monitoring report for the airport sewage treatment system from Stantec, the county's consultant, noted that tile beds had been discharging into the groundwater and producing unacceptable high nitrate levels in three test wells and a neighbour's well for the first half of 2013.
With the sewage treatment plants, the city government wants to address market waste, which is similar to domestic sewage mostly composed of fish scales, bones, blood, meat bits, dirt, and filthy water that could pollute streams and rivers if discharged untreated to bodies of water.
Municipal Corporation should have the sewage treatment system.
We have a new sewage plant in Jebel Ali and most of the load has been diverted there," said Mohammad Najm, Director of the Sewage Treatment Plant Department at Dubai Municipality.
In essence, as Rock Farm is approaching the end of its life, it is our intention to close Rock Farm sludge treatment facility and bring the sewage treatment operations to Finham sewage treatment works site.