Method of purification of waste water by treatment with zirconium salt
AssigneeShikoku Paper Mfg. Co., Ltd.
InventorBuichiro Ayukawa
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Abstract
The present invention refers to a method of purification of waste water from chemical pulping and paper mills comprising coagulate and precipitate suspended substances and colloidal dispersed particles, and precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and form water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source by the use of zirconium salt.
Claims2
A process for the purification of surface water which comprises adding an aqueous solution of ZrOCl.sub.2.8H.sub.2 O to said surface water and adjusting the pH to 4.5-6.8 to coagulate and precipitate suspended substances and colloidal dispersed particles and precipitate non-colloidal dissolved, low molecular weight organic substances therein in the form of insoluble precipitates and chelates, and removing said precipitates and chelates.
Dependencies are inferred from the claim text.