Isophthalonitrile wastewater treatment system

Abstract

The invention relates to an isophthalonitrile wastewater treatment system, which sequentially comprises a collection device (1), a cyanogen removal tank (2), a secondary sedimentation tank (3), an ammonia distillation tower (4), an ultrasonic / three-dimensional electrolysis device (5), an anoxic tank (6) and an MBR (membrane bioreactor) device (7). After wastewater enters the ultrasonic / three-dimensional electrolysis device (5), under the action of ultrasonic waves, added sludge is partially disintegrated to provide a carbon source for the wastewater and optimize the carbon-nitrogen ratio of the wastewater, and meanwhile, undisintegrated sludge can be used as anode microorganisms to degrade the wastewater, so that the wastewater generates nascent carbon dioxide, a carbon source which is easier to absorb is provided for ammonia nitrogen reduction, ammonia nitrogen is converted into nitrate and nitrite, and nitrate and nitrite enter a cathode particle filling area through a diaphragm.

Description

technical field [0001] The invention belongs to the field of waste water treatment of refractory organic matter, and in particular relates to a waste water treatment system of isophthalonitrile. Background technique [0002] The organic content in isophthalonitrile wastewater is high, mainly from organic nitriles such as benzonitriles, amides, m-xylene, etc., COD Cr , TN, and cyanide ions are all high in concentration, and high ammonia nitrogen in wastewater affects microbial activity. Even if it is blown off, the organic matter contained in wastewater will still be released into ammonia nitrogen when it is degraded, increasing the concentration of ammonia nitrogen in wastewater. Normal biochemical treatment is difficult to carry out. [0003] CN101708929A discloses a method for treating waste water produced in the production process of isophthalonitrile. The waste water is firstly pretreated by the ferricyanide complex method, and then applied to the biological treatment m...

AI Technical Summary

Problems solved by technology

[0002] The organic content in isophthalonitrile wastewater is high, mainly from organic nitriles such as benzonitriles, amides, m-xylene, etc., COD Cr , TN, and cyanide ions are all high in concentration, and high ammonia nitrogen in wastewater affects microbial activity. Even if it is blown off, the organic matter contained in wastewater will still be released into ammonia nitrogen when it is degraded, increasing the concentration of ammonia nitrogen in wastewater. Normal biochemical treatment is difficult to carry out

[0003] CN101708929A discloses a method for treating waste water produced in the production process of isophthalonitrile. The waste water is firstly pretreated by the ferricyanide complex method, and then applied to the biological treatment method of "anoxic + aerobic biochemical treatment + advanced treatment" , which only discloses the process of removing cyanide before biochemical treatment, and does not solve the solution to the harm of organic nitrogen in wastewater to subsequent biochemical treatment. Because the pollutants in isophthalonitrile wastewater have a benzene ring structure, microorganisms are difficult to treat , therefore, only after cyanide breaking treatment, conventional biochemical treatment has poor effect, long cycle and high cost, and it is difficult to meet the current wastewater treatment requirements, so it is necessary to develop a new treatment system to solve this problem

Images