Processing method for papermaking wastewater

Abstract

The invention provides a processing method for papermaking wastewater. The processing method is characterized in that a coagulant is added into a wastewater pipeline or at an outlet through a spray pipeline; the spray pipeline is connected with at least one additive pipeline; a composite element capable of improving coagulant efficiency is added into the coagulant through the additive pipeline; and the composite element and the coagulant are mixed and the mixture enters the wastewater in the wastewater pipeline or at the outlet, wherein the coagulant is selected from the group consisting of poly aluminum chloride, and an acrylamide-diallyldimethyl ammonium chloride copolymer or acrylamide-ammonium acrylate copolymer; and the composite element is selected from the group consisting of acrylamide-diallyldimethyl ammonium chloride copolymer, acrylamide-ammonium acrylate copolymer, calcium chloride, and activated silicic acid, hydrochloric acid, and phosphoric acid or sulfuric acid.

Description

technical field [0001] The invention relates to a treatment method for papermaking sewage, which belongs to the technical field of sewage treatment. Background technique [0002] In papermaking wastewater treatment and water purification, coagulation is one of the very important units. It uses coagulants to change the state of particles in water, so that suspended components and colloidal components in water can be separated, and under certain conditions, they can be formed Sedimentation or air flotation separates flocs, and then separates this part of flocs by sedimentation or air flotation. In the coagulation treatment, the coagulant used for different types of sewage is the key to the treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing treatment of papermaking sewage The various coagulants mainly use polyacrylamide or aluminum salt, and do not make a good distinction for papermaking wastewater...

AI Technical Summary

Problems solved by technology

In the coagulation treatment, the coagulant used for different types of sewage is the key to the treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing treatment of papermaking sewage The various coagulants mainly use polyacrylamide or aluminum salt, and do not make a good distinction for papermaking wastewater; at the same time, the compounding process is also an important unit in sewage treatment, and there are compounding processes in the compounding process Some problems of time and dosage, for example, in the process of papermaking sewage treatment, there are problems such as the slow reaction between the coagulant and the papermaking sewage and the coagulant does not react with the suspended solids in the water, resulting in the metal elements in the coagulant remaining in the In the water, secondary pollution occurs, and the reaction of the coagulant is not complete, which also causes waste of coagulant and increases the cost of sewage treatment