A kind of anionic surfactant sewage treatment method

Abstract

A novel anionic surfactant sewage treatment method comprises the following steps: (1) surfactant sewage pretreatment; (2) dosage measurement; (3) dosing solution; (4) coagulation and precipitation. The dosage of the present invention is small, the treatment cost is low, and the concentration of anion / cation surfactant sewage is as high as thousands of milligrams per liter. Below the grade standard, the mud production is small, and the process runs stably.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to a novel anionic surfactant sewage treatment method. Background technique [0002] At present, surfactant production enterprises usually mix sewage with other wastewater for centralized biochemical treatment, but the high-concentration organic pollution that is difficult to degrade has an impact on the subsequent biochemical treatment process, which greatly affects the treatment effect of the biochemical process. Now the surfactant sewage treatment method There are mainly foam separation method, biochemical method, coagulation precipitation method, and adsorption separation method. Each method has its own defects: in general, it is difficult to treat high-concentration sewage higher than 200mg / L, the treatment cost is high, and secondary pollution is large. , and the processing technology is also unstable. [0003] Foam separation method: First, a large amount of foam concentrate wi...

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Problems solved by technology

[0002] At present, surfactant production enterprises usually mix sewage with other wastewater for centralized biochemical treatment, but the high-concentration organic pollution that is difficult to degrade has an impact on the subsequent biochemical treatment process, which greatly affects the treatment effect of the biochemical process. Now the surfactant sewage treatment method There are mainly foam separation method, biochemical method, coagulation precipitation method, and adsorption separation method. Each method has its own defects: in general, it is difficult to treat high-concentration sewage higher than 200mg / L, the treatment cost is high, and secondary pollution is large. , the process is also unstable

[0003] Foam separation method: First, a large amount of foam concentrate will be produced, and the treatment of foam concentrate is difficult; second, it is only suitable for sewage treatment of anionic surfactants with a low concentration, and "foaming" cannot be achieved if the concentration is higher than 200mg / L sewage "Liquid" separation; the concentration of the three effluents is high, generally higher than 5mg / L;

[0004] Biochemical method: First, it is only suitable for low-concentration anionic surfactant sewage treatment. When the concentration of anionic surfactant is high, it will cause the activated sludge to float up. In addition, high-concentration surfactants have a bactericidal effect and will lead to bacterial inactivation. Thus the system is paralyzed; the second is that the core process of biochemical method to remove surface activity is the aerobic link, and the aeration process in the aerobic link will produce a large amount of foam, which needs to be treated with a large amount of defoaming agent, which is costly and simultaneously produces Secondary pollution; three effluent concentrations are high, generally higher than 5mg / L; fourth, the process requires stable influent water quality, which is difficult to meet the requirements of surfactant manufacturing and synthetic detergent manufacturing industries. Periodic flushing of equipment makes the concentration of anionic surfactants suddenly increase treatment requirements; there is also the problem of low water temperature in winter and poor treatment effect;

[0005] Coagulation and sedimentation method: there are problems of large dosage and low removal rate, and it is mostly used for biochemical pretreatment; PAC, PAM and other chemicals are added in the actual treatment process, and the actual removal rate is less than 20%;

[0006] Adsorption separation method: First, the adsorption efficiency is extremely low, and activated carbon, zeolite, etc. are not more than 50mg / m 3 , the treatment cost is high; the second is that the water quality SS requirements are relatively high; the third is that the secondary pollution of waste adsorbents is large

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