Sewage treatment is the process of removing contaminants from wastewater and household sewage water, wastewater treatment & disposal is an important part of protecting & preserving the water resources.
Sewage can be treated close to where it is created (in septic tanks and their associated drain fields or sewage treatment plants), or collected and transported via a network of pipes and pump stations to a municipal treatment plant. The former system is gaining popularity for many new eco towns, as 60% of the cost of main sewerage is in the pipework to transport it to a central location and it is not sustainable. It is called ‘decentralisation’ of sewage treatment systems.
Sewage is partly decomposed by anaerobic bacteria in a tank without the introduction of air, containing oxygen. This leads to a reduction of organic matter into methane, hydrogen sulphide, carbon dioxide etc. It is widely used to treat wastewater sludge and organic waste because it provides volume and mass reduction of the input material to a large extent.
The methane produced by large-scale municipal anaerobic sludge treatment is currently being examined for use in homes and industry, for heating purposes. Septic tanks are an example of an anaerobic process, but the amount of methane produced by a septic tank (it is only the sludge at the bottom that produces methane) serving less than 100 people is miniscule. In addition to this, septic tank effluent still contains about 70% of the original pollutants and the process smells very badly, due to the hydrogen sulphide, if not vented correctly.
In this process, aerobic bacteria digest the pollutants. To establish an aerobic bacterial colony, you must provide air for the bacteria to breathe. In a sewage treatment plant, air is continuously supplied to the biozone either by direct surface aeration using impellers propelled by pumps which whisk the surface of the liquid with air, or by submerged diffused aeration using blowers for air supply through bubble diffusers at the bottom of the tank. (the most modern aerobic sewage systems use natural air currents and do not require electricity, though these are only used for small scale sewage systems at the moment. Once again, the general public leads the way!) aerobic conditions lead to an aerobic bacterial colony being established. These achieve almost complete oxidation and digestion of organic matter and organic pollutants to carbon dioxide, water and nitrogen, thus eliminating the odour and pollution problem above.
We Design, Erect and Commission Sewage Treatment Plant (STP) on Turnkey basis to various types of industries and Organizations across the country.
- We primarily design the Sewage Treatment Plant
- We adopt and accommodate the existing sewage treatment plant with slight modification to suit zero liquid discharge microbes digested sewage treatment plant system
- We undertake the operation and maintenance of the STP
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