Novel anionic surfactant sewage treatment method

Abstract

A novel anionic surfactant sewage treatment method comprises the following steps: (1) surfactant wastewater pretreatment; (2) determination of a dosage of a chemical; (3) chemical solution dosing; and(4) coagulation sedimentation. The method has the advantages of small dosage and low processing cost, and can treat anion / cation surfactant wastewater having a concentration of up to thousands of milligrams per liter, and the effluent water quality is good. After the quantitative dosing, the concentration of an anionic surfactant in the sewage can be reduced to national standard third-level or less. The amount of mud produced is small, and the process is stable.

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 manufacturers usually mix sewage with other wastewater for centralized biochemical treatment, but the high concentration of 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. Current surfactant sewage treatment methods There are mainly foam separation method, biochemical method, coagulation sedimentation method, and adsorption separation method. Each method has its own shortcomings: in general, it is difficult to treat high-concentration sewage above 200mg / L, high processing cost, and high secondary pollution. , The treatment process is also unstable. [0003] Foam separation method: First, it will produce a large amount of foam concentrate, which is difficu...

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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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