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Explain how industrial waste water treatment is carried out?

Mumbai University > First Year Engineering > Sem 1 > Environmental Studies

Marks: 5M

Year: Dec 2015

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Industrial wastewater treatment processes-

  1. Preliminary treatment- The objective of preliminary treatment is the removal of coarse solids and other large materials often found in raw waste water.
  2. Primary treatment - The objective of primary treatment is the removal of settleable organic and inorganic solids by sedimentation, and the removal of materials that will float (scum) by skimming.
  3. Secondary treatment- The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids.by the process like-
  • Activated Sludge,
  • Trickling Filters
  • Rotating Biological Contactors
  1. Tertiary and/or advanced treatment-Tertiary and/or advanced wastewater treatment is employed when specific wastewater constituents which cannot be removed by secondary treatment must be removed.
  2. Disinfection-It involves the injection of a chlorine solution at the head end of a chlorine contact basin.
  3. Effluent storage-Although not considered a step in the treatment process, a storage facility is, in most cases, a critical link between the wastewater treatment plant and the irrigation system. Storage is needed for the following reasons:
  • To equalize daily variations in flow from the treatment plant and to store excess when average waste water flow exceeds irrigation demands; includes winter storage.
  • To meet peak irrigation demands in excess of the average wastewater flow.
  • To minimize the effects of disruptions in the operations of the treatment plant and irrigation system. Storage is used to provide insurance against the possibility of unsuitable reclaimed wastewater entering the irrigation system and to provide additional time to resolve temporary water quality problems.
  • Reliability of conventional and advanced wastewater treatment-Wastewater reclamation and reuse systems should contain both design and operational requirements necessary to ensure reliability of treatment.
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