METHOD OF THE PULP-AND PAPER PRODUCTION SEWAGE PURIFICATION Russian patent published in 2005 - IPC

FIELD: environmental protection; purification of sewage of pulp-and-paper production from lignine materials.

SUBSTANCE: the invention is pertaining to the field of environmental protection, in particular, to purification of sewage of pulp-and-paper production and may be used for purification of sewage of pulp-and-paper production from lignine materials. For realization of the method the sewage is treated with salts of aluminum, iron, zinc or magnesium in a combination with calcium compounds in the mediums with pH of no less than 10.5 at a following batching of the components: salts of metals - 0.3-12 mg-equiv/l, calcium compounds - 40-150 mg-equiv/l and separate the formed suspended matters. The method ensures a decrease of consumption of reactants used for effective purification of sewage at reduction in price of the purification process of sewage of pulp-and-paper production.

EFFECT: the invention ensures a decrease of consumption of reactants used for effective purification of sewage at reduction in price of the purification process of sewage of pulp-and-paper production.

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