Sewage Treatment Plant Process - Gamyam Bio

Sewage Treatment Plant Process

Sewage treatment refers to the process of getting rid of contaminants, micro-organisms and other pollutants from waste water. The main objective of sewage treatment is to produce an effluent and a solid waste suitable for discharge into the natural environment. Depending on the size of the municipality in which the sewage treatment plant is located, it may be composed of mainly household sewage or it may be industrial waste water treatment as well. In Sewage waste water treatment, we will remove solid materials from the waste and next processes to break down dissolved nutrients and organic materials. Treatment of sewage or waste water protects public health and prevents pollution, disease as well as hazards from sewage contaminants. Gamyam Bio provides the best Sewage treatment products and services in Hyderabad.

Sewage treatment process fall into two types:

1.    Anaerobic sewage treatment process

2.    Aerobic treatment process

Anaerobic sewage treatment process:

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 serving less than 100 people is miniscule.

Aerobic Sewage Treatment Process

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.

Conventional sewage water treatment involves either two or three stages called primary, secondary and tertiary treatment. Before these treatments, preliminary removal of rags, cloths, sanitary items etc. is also carried out at municipal sewage works.

Primary Treatment

This involves the separation of organic solid matter from the wastewater. This is done by putting the waste water into large settlement tanks for the solids to sink to the bottom of the tank. The settled solids are called sludge. At the bottom of these circular tanks, large scrappers continuously scrape the floor of the tank and push the sludge towards the centre where it is pumped away for further treatment . The rest of the water is then moved to the secondary treatment

Secondary Treatment

The water, at this stage, is put into large rectangular tanks. These are called aeration lanes. Air is pumped into the water to encourage bacteria to break down the tiny bits of sludge that escaped the sludge that escaped the sludge scrapping process.

Tertiary Treatment

Next, the almost treated wastewater is passed through a settlement tank. Here, more sludge is formed at the bottom of the tank from the settling of the bacterial action. Again, the sludge is scraped and collected for treatment. The water at this stage is almost free from harmful substances and chemicals. The water is allowed to flow over a wall where it is filtered through a bed of sand to remove any additional particles.