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प्रश्न
Explain the steps involved in preliminary treatment of sewage.
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उत्तर
- Screening: Sewage and waste water contain plenty of suspended, floating materials, coarse, and solid particles, along with dissolved substances. The suspended objects are filtered and removed. This is done in screening chambers. The sewage is passed through screens or net in the chambers. Larger suspended or floating objects are held in the screening chambers. These have to be removed before the biological treatment.
- Grit Chamber: After screening, the filtered sewage is then passed into a series of grit chambers. These chambers contain large stones (pebbles) and brick-ballast. Coarse particles settle down by gravity. Thus, passage of filtered sewage removes much of the coarse particulate matter.
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संबंधित प्रश्न
Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) it.
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
Which of the following is TRUE about primary treatment?
In the process of biogas production which of the following anaerobic bacteria are used?
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Identify the type of microorganisms involved in floe formation during sewage treatment.
Study the following statements regarding tertiary treatment of sewage and choose the correct option.
i. It produces methane gas.
ii. The effluents formed from these plants undergo chlorination.
iii. BOD is significantly increased at this step.
iv. It includes screening and passage of effluent through grit chamber.
Which of the following process is a part of preliminary treatment of sewage?
Nitrogen fixation by organisms requires conditions that are:
Methanogenic bacteria are not found in ______.
