Method for recycling paper mill waste water

Details Method for recycling paper mill waste water Method for recycling paper mill waste water

1976-11-08

1978-09-19

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

Reclamation, salvage or reuse of materials

162191, 210 53, D21F 166

Patent

active

041151887

ABSTRACT:
Disclosed is a method for coagulating the suspended solids in paper mill waste water so that the coagulated solids may be easily separated from the waste water and the clarified waste water reused in the paper making process. Coagulation is induced by first adding sulfuric acid to lower the pH to below 4, mixing thoroughly, and then adding calcium hydroxide to raise the pH to above 10. The coagulated solids separated from the waste water may be used as a landfill, used as a low grade pulp source, or dewatered and burned as a fuel.

REFERENCES:
patent: 1968114 (1934-07-01), Windecker
patent: 1980896 (1934-11-01), Windecker
patent: 2057059 (1936-10-01), Rue
patent: 2074082 (1937-03-01), Domogalla
patent: 3235444 (1966-02-01), Kruger
patent: 3354028 (1967-11-01), Illingsworth
patent: 3575853 (1971-04-01), Gaugham et al.
patent: 3639206 (1972-02-01), Spruill
"Screening of Effluents," Fuller, Tappi, vol. 56, No. 6, Jun. 1973, pp. 104-106.

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