Technology for treating wool washing wastewater by adopting chemical oxidation process

Abstract

The invention discloses a new technology for treating wool washing wastewater by adopting a chemical oxidation process. The new technology is characterized by comprising the following steps of: (1) taking the wool washing wastewater as raw water, regulating pH to be 5-5.5, adding an oxidation catalyst and an oxidant at the temperature of 25 DEG C, carrying out chemical reaction for 6 hours, then lowering valence of an organic matter through oxidation, so that the organic matter can be dissolved in water, adding a flocculation agent PAM to generate water insoluble flocculation bodies, standing in a water phase, and then naturally settling a water diversion layer, wherein foams above liquid level are fewer, and upper and lower interfaces are clear; and (2) then enabling an upper layer water phase with COD removal rate of 70-80% to enter a biological regulation tank, and obtaining non-sticky wet solid flocculation bodies with water content of 70-80% from a lower layer mixture of water and flocculation bodies with high water content and good liquidity by virtue of plate-and-frame filter press. The treated wastewater can produce separated non-sticky wet solids, the traditional technology only can adopt precipitation or filter pressing, while the scheme of the invention can realize separation through physical filtration only, and effect is good.

Description

technical field [0001] The invention belongs to the technical field of textiles, and in particular relates to a process for treating wool washing wastewater by chemical oxidation. Background technique [0002] In the wool spinning industry, the discharge of wool washing wastewater is large, which contains a large amount of lanolin, sheep sweat, sheep manure, soil, etc., which is heavy in color and smelly, and seriously pollutes the environment. At present, the treatment of wool washing wastewater mainly includes membrane separation physical method, biochemical method and chemical flocculation method, among which chemical flocculation method is more commonly used. However, most foreign studies have shown that the treatment of wool washing wastewater should be comprehensively considered from two aspects of lanolin recycling and sewage treatment to achieve better results. [0003] For wool washing wastewater treatment technology, most domestic factories use ferrous sulfate met...

AI Technical Summary

Problems solved by technology

The detergent and oil added during scouring cannot be removed. The middle water phase contains 2% ferrous sulfate, and the pH 4 tends to turn light brown. It enters the biochemical adjustment tank, and the flocs separated from the lower layer account for about a quarter of the raw water. The settling pond with the same area will continue to be separated for several days, and finally accounts for about one-ninth of the raw water, that is, it can no longer be treated, which will cause environmental pollution.