The wastewater or sewage treatment plants are being used by industries to treat contaminated water and make it usable. Wastewater treatment India projects are employing such treatment plants that make the water cleaner and usable. The objective of secondary treatment involves further treatment of the effluent via primary treatment to expel the residual organics and contaminants. Most of the times, experts follow secondary treatment after primary treatment in the presence of oxygen by aerobic microorganisms that metabolize the wastewater organic matter.

Extreme-rate biological processes are characterized by high concentrations of microorganisms and small reactor volumes compared to low-rate processes. So, the growth rate of new organisms is greater in extreme-rate systems due to regulated environment. The microorganisms have to be expelled from the treated water by sedimentation to produce clarified secondary effluent.

See info-graphics: 5 Largest Wastewater Treatment Plants All Over the World 

The sedimentation tanks applied by experts in secondary treatment are known as secondary clarifiers that are operated in the similar way as the primary clarifiers do. The biological waste expelled during secondary sedimentation is combined with primary sludge for further processing.

What does high-rate process includes?

  1. Activated sludge processes
  2. Trickling filters
  3. Oxidation ditches
  4. Rotating biological contractors

Let’s discuss them all in detail:

  • Activated sludge – The activated sludge process involves a dispersed-growth reactor, which is an aeration tank or basin having a suspension of the microorganisms and wastewater, the mixed liquor. The contents present inside the tank are mixed by aeration devices that also provide oxygen to the biological suspension.
  • Trickling filters – These are biofilters having a basin or tower filled with support media like plastic shapes, stones, or wooden slats. Microorganisms become attached to the media and develop a biological layer or fixed film. Oxygen is provided to the film by natural flow of air via media.
  • Rotating Biological contractors – These are fixed film reactors similar to biofilters. In these reactors, support media are slowly moving discs that are half-submerged in running wastewater in the reactor. Oxygen is provided to the biofilm through air.

There are more advanced treatments used by professionals to treat wastewater. They use them to remove specific contaminants in water that cannot be removed by secondary treatment. If you need detailed info about it, do contact the experts. There are wastewater treatment India experts providing best knowledge on waste water treatment to their visitors. You may contact them and avail the details on the subject. Do share this post with your contacts and provide feedback at the end.

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