High-salt epoxy wastewater treatment method

Abstract

The invention discloses a high-salt epoxy wastewater treatment method. According to the invention, with a sequencing batch manner, wastewater is sequentially processed through hydrolysis, acidification, anaerobic, hyperoxia and hypoxia processes. Insoluble pollutants are dissolved in a hydrolysis tank (3); macromolecules and refractory pollutants are converted into small molecules in an acidification tank (4); in an anaerobic tank (5), B / C is further improved, and water quality biodegradability is further improved; in a hyperoxia tank (7), a large amount of degradable organics are degraded into inorganic small molecules; and in a hypoxia tank (8), residual organics are further decomposed, and outlet water quality is stabilized. Sludge in different sections is refluxed separately, such that flora mixing is avoided, and impact resistance is improved. With the method, wastewater pollutants with different properties are gradually decomposed with the sequencing batch manner; unit treatment efficiency is high; and organic pollutant reduction rate is high.

Description

technical field [0001] The invention relates to a fine chemical wastewater treatment process technology, specifically refers to the use of sequential batch hydrolysis acidification-aerobic biochemical method, that is, through the process combination of "hydrolysis-acidification-facultative oxygen-high oxygen-low oxygen" to make The gradient of organic matter concentration decline in wastewater and the type and quantity of microbial communities are matched synergistically, so as to obtain stable and efficient treatment efficiency. Background technique [0002] Because boiling water is used for washing and purification in the production of epoxy resin, the temperature of the discharged wastewater is relatively high. The wastewater is high-concentration saline wastewater with complex components, which can be mainly divided into three categories: [0003] 1 Organic matter: including macromolecular intermediate products generated by polycondensation reaction, excess raw material ...

AI Technical Summary

Problems solved by technology

[0009]1 The concentration of COD in the effluent reaches 300-500 mg / L, which is difficult to meet the discharge standards or take-over requirements;

[0010]2 Salt fluctuations in wastewater have a greater impact on the stable operation of the system;

[0011]3 The treatment efficiency of hydrolysis, biochemical and other units is not ideal

[0012]The reasons for the above defects: ① The hydraulic retention of each unit of hydrolytic acidification and aerobic biochemical is improperly distributed, and the time of hydrolytic acidification in most processes is shorter than that of aerobic biochemical Degradation of pollutants and insoluble pollutants failed to degrade into small molecules in the hydrolytic acidification unit, resulting in a significant drop in the efficiency of the aerobic biochemical unit; The distribution is uneven or there is a concentration gradient, and the synergy between the bioconcentration distribution and the pollutant degradation efficiency has not been properly dealt with in the process; ③ Improper return of sludge or mixed solution leads to disordered microbial populations; ④ Hydrolytic acidification and aerobic biochemical units lack good hydraulic regulation , the system has poor adaptability to salinity fluctuations and microbial community stability

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