Method for performing harmless degradation to high chlorine content polyacrylamide wastewater by using microorganisms

Abstract

The invention relates to a method for performing harmless degradation to high chlorine content polyacrylamide wastewater by using microorganisms. The method comprises the following steps of: (1) evenly mixing Micrococcus T2, Corynebacterium Z5 and Pseudomonas Y6 in a weight ratio of (1-6): (1-4): (2-5) to obtain a composite bacteria solution; (2) preparing a nutrient solution; (3) mixing the composite bacteria solution and the nutrient solution; (4) conveying polyacrylamide wastewater to a hydrolysis pool with the additional mixed solution, staying for 12-24 hours, then conveying the solution to an aerobic tank with the additional mixed solution, and staying for 80-120 hours; and (5) after the aerobic treatment, continuously discharging the wastewater subjected to the aerobic treatment through a hollow fiber microfiltration membrane component. The used, efficient and good composite bacteria solution can be used to degrade polyacrylamide under the high chlorine condition that the NaCl concentration is no more than 100000mg / L, the removal rate is up to 80%-85%, the acrylamide monomer obtained through depolymerization can also be degraded, the residual rate of acrylamide is no more than 0.03%, the secondary pollution problem of polyacrylamide degradation adopting the traditional biochemical method and chemicophysical method is solved and the harmless degradation of polyacrylamide is actually realized.

Description

technical field [0001] The invention belongs to the field of industrial sewage treatment, and in particular relates to a method for microbial treatment of high-chlorinated polyacrylamide wastewater. Background technique [0002] Polyacrylamide (PAM) is an important class of linear copolymerized water-soluble polymers. The molecules in the aqueous solution are in the form of coils and have good thermal stability. PAM has the characteristics of flocculation, thickening, surface activity, sedimentation, filtration, thickening, retention, purification, etc. Therefore, it has a wide range of applications in the fields of oil extraction, water treatment, textile, papermaking, mineral processing, medicine, agriculture, etc. , known as "Hundred Industry Auxiliaries". The final attribution of PAM application is mostly into surface water or groundwater, and sewage containing PAM will not only change the physical and chemical properties of water, but also contribute to COD chemical ox...

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Problems solved by technology

Among them, chemical degradation has problems such as high production cost, toxic products after degradation, and more serious secondary pollution to the environment; mechanical degradation has problems such as high stirring power, high processing cost of shearing equipment, and low PAM degradation rate; thermal degradation There are high temperature requirements that are difficult to achieve in actual production; while the research on biodegradation has just started at home and abroad, traditional biochemical sewage treatment cannot effectively degrade polyacrylamide, the main reason is that polyacrylamide and acrylamide after depolymerization The monomer is toxic, and general microorganisms cannot grow in wastewater containing polyacrylamide, and even if they grow, they cannot effectively degrade polyacrylamide; industrial wastewater containing polyacrylamide generally has a high chlorine content, and general microorganisms in high chlorine content The growth is inhibited or even died in the environment, and it cannot be degraded; there is a serious loss of bacteria in the ordinary biochemical sewage treatment system, which also greatly reduces the degradation efficiency of the biological method

Therefore, the treatment of sewage containing polyacrylamide has become a major problem in the treatment of organic wastewater.

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