Sewage treatment plants use microorganisms to destroy the biological material in sewage.
Sewage treatment plants use microorganisms to destroy the biological material in sewage.
Microorganisms play an important role in waste treatment. They break down the waste, they also create energy out of it.
If microorganisms are used in the water treatment plant then it is necessary to provide oxygen to them and make the sludge degradation through them so air is bubbled for oxidation as well as for microorganisms.
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There are many microorganisms in sewage.
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Sewage purification in natural way:Sewage is purified by microorganisms present in sewage in an environmentally favourable condition to them. Microorganisms purify sewage either in the presence of oxygen or in the absence of oxygen also. When dissolved oxygen is completely utilised resulting no dissolved oxygen in the sewage, sewage attains a stingy condition commonly known as septic condition.
Delhi India has presently 27 sewage treatment plants
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There are two types of micro organisms at work in a sewage treatment plant., aerobes (oxygen needing microbes) and anaerobes (microbes that do not need oxygen) The anaerobes are mixed with the raw delumped sewage in aerated basins. They rat up the small particles and dissolved organic material present in the sewage to produce carbon dioxide and their own microbe bodies. The Anaerobes are stained out and the sewage is discharged to the effluent discharge. The removed aerobes are then put in the anaerobic digestor tanks where anaerobic bacteria eat them up creating methane which is collected to power the plant. Eventually all the bacteria in the digestor are consumed leaving inert materials.
The main contributor to increasing pollution level in Ganga river is the sewage water which is disposed directly in to ganga without proper treatment.one f the best way to control pollution in ganga can be effective treatment of all the wastewater before they enter the holy river.Improvement in the funtioning of the sewage treatment plants could be a great help as most of the sewage treatment plants fail to meet their standards as described by Centre for pollution control board(CPCB0.Another possible method can be diversion of the water in drains in to various ponds where the sewage water gets treated before it enters the river.These ponds may be oxidation ponds,ponds with various microorganisms which can feed upon the waste in the sewage water to reduce the sewage load and ponds with aborbing plantations of pollution absorbing plants etc.
There are basically two types of sewage treatment plants 1. Chemically treated - where chemicals are added to break down the effluents and disinfect it 2. Biologically treated - the effluent is broken down with the help of aerobic bacteria