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Activated Sludge Modeling—A Guide To Its Variables

Activated Sludge—Definition
Activated sludge may be defined as the sludge which gets settle down after the sewage has been agitated freely with the presence of plentiful atmospheric oxygen. Activated sludge contains a large number of bacteria and another organism that acts as a fertilizing constituent called an agent when mixed with raw sewage. This raw sewage contains sufficient O2, through which the bacteria performs three functions as—
  • It oxidizes organic solids
  • Promotes coagulation and flocculation
  • Converts colloidal and dissolved solids into settled solids
Activated Sludge Treatment Process
What is it?
Activated sludge modeling refers to a mass of microorganisms that are cultivated in the treatment process to break down the organic matter into carbon dioxide, water, and other inorganic compounds. The process of activated sludge has three essential components: 

1) A reactor: the microorganisms are kept in suspension, exposed, and keeping in the contact with waste they are treated
2) Liquid and solid separation
3) A sludge recycling system: this is used for returning activated sludge back to the starting of the process. 

There are numerous variants of activated sludge modeling which process is a good way. This also includes variations in the exposing method and the way sludge is returned to the process.

When is It Used?
Despite the fact that many activated sludge treatments work in numerous developing countries, a very few of them is intended when required. Activated sludge modeling is considered as an appropriate process where high removal of organic pollution is required, funds and skilled workers are available for operation and maintenance for sewage water, and land is scarce or expensive. Since the activated sludge requires a continuous operation of oxygen blowers and pumps, a steady energy supply is also needed to make the process in continuous.

Its Advantages
When the efficient removal of wastes is required from the sewage, then it is designed professionally that can be operated according to local requirements. The process itself is known for its flexibility, and numerous modifications can also be tailored to meet specific requirements for instance nitrogen removal, or harmful contents in sewage. Activated sludge is considered to be the best documented which is widely used for secondary wastewater treatment.

Advantages of Activated Sludge Process 
  • Low cost for installation
  • Good quality sewage
  • Little requirement of land
  • Loss of head is small
  • Freedom from fly and odor nuisance with the help of high degree of treatment
Closing Lines
Therefore, activated sludge modeling is preferred for significant sewage water treatments because of its immense working ability and productivity.


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