A modular integrated process method for chemical recycling wastewater treatment

Abstract

The invention belongs to the technical field of environmental treatment and resource utilization, and in particular relates to a modular integrated process method for chemical recycling wastewater treatment. To solve the problem that the high-concentration wastewater discharged after treatment is more difficult to deal with, process integration and parameter design are carried out. The integrated process consists of three modules: the first-level pretreatment module, the second-level biochemical module and the third-level advanced treatment module, of which the first-level pretreatment module The module is mainly equipped with regulating acid regulation tank, improved Fenton reactor, electrochemical reactor, sedimentation tank and neutralization tank; the secondary biochemical module is mainly equipped with anaerobic sub-module (internal and external double-enhanced circulation anaerobic reactor) and aerobic sub-module Modules (biological contact oxidation tank, membrane bioreactor); the three-stage advanced treatment module is mainly equipped with a heterogeneous catalytic ozone activated carbon adsorption reactor. The process of the invention has the characteristics of flexibility, high efficiency, convenience, intelligence and the like, and can ensure the economical, effective and stable operation of the wastewater treatment facility.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment and resource utilization, and in particular relates to a high-concentration esterification wastewater treatment system treated by acetaldehyde recovery technology, aiming at the treatment of organic wastewater generated in the production process of polyester industry by acetaldehyde recovery technology To solve the problem that the high-concentration wastewater discharged later is more difficult to deal with, process integration and parametric design are carried out to realize process modularization, intelligence and integration. Background technique [0002] In recent years, under the influence of the vigorous support of national policies and the rapid development of economic level, the chemical industry has developed rapidly, and the output value of the polyester industry has also increased significantly. It poses a great threat to the ecological environment and daily life. [0...

AI Technical Summary

Problems solved by technology

[0005] ① Esterification wastewater has complex components and poor biochemical properties, high COD, low N and P content, and is difficult to treat, and some substances containing benzene ring structures and some long-chain complex organic substances are difficult to biodegrade; although acetaldehyde recycling technology The COD concentration is significantly reduced, but the main substances removed from the wastewater are acetaldehyde and ethylene glycol, and some substances containing benzene ring structures and other complex long-chain pollutants are present in the wastewater, making the discharged wastewater more toxic, Biochemical treatment is the most economical and effective way of water treatment

[0006] ②During the preparation of polyester products, changes in production raw materials and production lines, machine maintenance and production failures will affect the composition, discharge and discharge concentration of esterification wastewater, and the COD index will fluctuate greatly, which also reflects In the esterification wastewater discharged after the treatment of acetaldehyde recovery and utilization technology, the change of pollutant concentration has a very bad impact on the subsequent biochemical treatment;

[0007] ③The country’s wastewater discharge standards are becoming more and more stringent, and at the same time, higher and higher requirements are also put forward for reuse water. It is difficult to directly treat esterification wastewater to the reuse water standard

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