A kind of wet blue leather processing wastewater treatment process

Abstract

The invention discloses a treatment process of wet blue leather processing wastewater. The treatment process comprises the following steps: 1) in a grating well, filtering removed floating debris and impurities; 2) in a primary settling tank, removing large particulate matters; 3) in an adjusting tank, homogenizing the adjustments of the water amount and the water quality; 4) in a pH adjusting tank, adjusting the pH value; 5) in a physicochemical sedimentation tank, precipitating flocculates and removing suspended matters; 6) in an intermediate pool, adjusting the pH value; 7)in a biochemical treatment tank, carrying out acidified hydrolysis, anaerobic treatment and aerobic treatment to remove most of COD and ammonia nitrogen; 8) in an MBR membrane pool, separating mud and water; 9) using a precision filter to remove larger organic matter impurities and the particulate matters in wastewater; 10) using an RO reverse osmosis system to carry out reverse osmosis so as to remove tiny organic matter impurities and inorganic salts; 11) using an MVR evaporator to carry out evaporation, condensation and crystallization. The process disclosed by the invention can recycle wet blue leather processing wastewater to lower total amount of industrial water, and realize liquid-state zero emission and does not require receiving water to reduce environmental burdens and realize low operating cost.

Description

technical field [0001] The invention relates to a treatment process for wet blue leather processing wastewater, which belongs to the technical field of sewage treatment. Background technique [0002] Tannery industry is one of the traditional industries in my country with a long history. Because leather has unique hygienic and mechanical properties, it is especially suitable for wearing and using, and is favored by people. So far, there are more than 2,300 leather enterprises in my country. They are not only a pillar industry in the light industry, but also an industry that earns foreign exchange through export. [0003] However, the tanning industry is also a high water consumption and heavy polluting industry second only to the paper industry in the light industry, which seriously pollutes the environment. The pollution of the tanning industry mainly comes from two aspects: one is the wastewater generated during the processing, and the other is the large amount of chemic...

AI Technical Summary

Problems solved by technology

However, due to the limited ability of the biochemical system to remove salt in the existing process of processing wastewater from wet blue leather processing, the removal rate is between 10% and 20%, and the accumulation of salt is quite serious. Once the salt content exceeds the critical value, The treatment effect of the biochemical system will be significantly reduced, resulting in the destruction of the biochemical system, sludge poisoning, microbial inactivation and other problems, and eventually lead to the complete collapse of the biochemical system

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