Waste water treatment from Pulp and Paper Industries

Waste water treatment from Pulp and Paper Industries



Sources

The raw material preparation, pulping, washing, bleaching, chemical recovery, screening of pulp and paper making contribute to wash effluents.

Characteristics
i. The water is dark brown.
ii. It contain high percent of suspended solid.
iii. It contain high percent of dissolved solid.
iv. It has bad odour.
v. It has high COD.
vi. Resistant to biological oxidation.


Effects
i. The dark vlour imparts persistent colour to the receiving water stream and inhibits photosynthesis.
ii. The immediate oxygen demand of the effluent brings about depletion of oxygen of the receiving stream.
iii. The chemical present in the effluent are harmful to fauna and flora of the receiving water.



Treatment option
i. Recovery of bi-products.
ii. Preliminary and primary operation carried out to remove suspended matter.
iii. Chemical treatment to remove dissolved organics.
iv. Lagoonong for storage and biodegradation of organic matter.