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What is equalization? Why it is necessary? Discuss various methods of mixing adopted for equalization.

Mumbai university > Civil > SEM 8 > Industrial Waste Treatment

Marks: 10M

Year: May 2012,

1 Answer
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  • It is the method of retaining waste in a basin so that the effluent discharge is fairly uniform in its characteristics.

  • The main objective is to minimize or control fluctuations in waste water characteristics in order to provide better condition for subsequent treatment.

  • The purpose of equalization is to provide adequate damping of organic fluctuations inorder to prevent shock loading of biological treatment.

  • It also provide adequate pH control or to minimize the chemical requirements for neutralization.

  • It helps in providing continuous feed to biological systems once a period, when the manufacturing plant is not operating.

  • It helps in preventing high concentration of toxic materials from entering the biological treatment plant.

  • There are 2 types of equalization:

Inline equalization:

  • In the inline equalization all of the flow passes through the equalization basin.

  • This arrangement can be made to achieve a considerable amount of constituent concentration and flow rate damping.

Offline equalization:

  • In the offline arrangement only the flow above some predetermined flow limit is diverted into the equalization tank although the pumping requirement are minimized in this arrangement.

  • The amount of constituent concentration clamming is considerably removed. Offline equalization is sometimes used to capture first flush from combined collection.

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