Papermaking wastewater treatment method

Abstract

The invention relates to a papermaking wastewater treatment method. The papermaking wastewater treatment method comprises the following steps: (1) enabling papermaking wastewater to pass through a grating at first to filter large-sized impurities in wastewater and then to flow into an adjusting sedimentation tank; (2) adding diacetone acrylamide, polyoxyethylene alkyl amine, polyacrylamide and tetradecyl dimethyl ammonium chilride, and leaving to stand after stirring; (3) adding etherified starch, bentonite, potassium alginate and sodium 3-nitrobenzene sulfonate into papermaking wastewater, and leaving to stand after stirring; (4) adding a polyoxypropylene diol I, pentaerythritol, polyoxyethylene fatty alcohol, a polyoxypropylene diol II and alpha-aminoisocaproic acid, leaving to stand after stirring, and carrying out filtering to remove sediments and impurities; (5) feeding filtering clear liquid obtained in the step (4) into an ultraviolet disinfection tank for ultraviolet sterilization and disinfection. The papermaking wastewater treatment method is low in consumption of a treating agent, and particularly suitable for treating high-concentration papermaking wastewater.

Description

technical field [0001] The invention relates to a treatment method for papermaking waste liquid, belonging to the field of water treatment. Background technique [0002] The paper industry uses wood, straw, reeds, rags, etc. as raw materials, and cellulose is separated by high-temperature and high-pressure cooking to make pulp. In the production process, the non-cellulose part of the raw material is finally discharged to become papermaking black liquor. Black liquor contains lignin, cellulose, volatile organic acids, etc., heavy metal pollutants, odor, and strong pollution, which can seriously pollute water resources and cause ecological balance. At present, the problem of sewage treatment in paper mills is very serious, and The high cost makes papermaking wastewater from paper mills become one of the major sources of water pollution, and its treatment is becoming more and more urgent. The current treatment methods include sedimentation method, biological decomposition meth...

AI Technical Summary

Problems solved by technology

Black liquor contains lignin, cellulose, volatile organic acids, etc., heavy metal pollutants, odor, and strong pollution, which can seriously pollute water resources and cause ecological balance. At present, the problem of sewage treatment in paper mills is very serious, and The high cost makes papermaking wastewater from paper mills become one of the major sources of water pollution, and its treatment is becoming more and more urgent. The current treatment methods include sedimentation method, biological decomposition method, electrolysis method, etc. The effect of sedimentation method is poor, and biological decomposition method It is difficult to control and the cost of electrolysis is too high, so a treatment method that is simple to use, effective and low in cost is needed

[0003] Adsorption flocculation is a low-cost papermaking waste treatment method, but at present, a single flocculant is not effective in treating multiple pollutants that exist simultaneously in papermaking waste

In addition, most of the existing flocculants contain aluminum, which is extremely harmful to human health.