System for deep treatment of coking wastewater by means of catalytic ozonation-ceramic membrane filtration

Abstract

The invention discloses a system for deep treatment of coking wastewater by means of catalytic ozonation-ceramic membrane filtration, mainly consisting of an ozone generator, an ozone oxidation reactor, a booster pump, a ceramic membrane component, a gas-liquid separator, a tail gas absorbing device, a wastewater reflowing pump, a catalyst reflowing pump, a catalyst adding pump, a catalyst outflowing groove, a catalyst adding groove and corresponding pipe fittings, valves and instruments. According to the system, the application of a powder catalyst in a dynamic reactor can be realized due tothe combination of the catalytic ozonation and the ceramic membrane separation; the ozonation and the catalytic ozonation can be guaranteed to be carried out in a single reactor in a segmental way due to the convection current of the reflowing wastewater and the catalyst slurry and the impact of upcurrent; the mass transfer resistance when the ozonation and the catalytic ozonation are independently used can be reduced; the use ratio of hydroxyl free radical and the removal rate of organic matters can be improved; the aims, such as the COD (chemical oxygen demand), the chroma and the turbidityof the deeply-treated coking wastewater, can be achieved; and the problems that the activity is suddenly reduced when the powder catalyst is formed into particulates, the running needs to be suspended when the mass transfer resistance is increased due to the use of the particulate catalyst and the particulate catalyst is changed and the like can be solved.

Description

technical field [0001] The invention relates to a new system for advanced treatment of coking wastewater, in particular to a system for advanced treatment of coking wastewater by catalytic ozonation-ceramic membrane filtration. Background technique [0002] Coking wastewater contains a variety of high-concentration toxic and harmful substances such as phenol, ammonia nitrogen, cyanide, benzene, pyridine, indole, and quinoline. Its excessive discharge poses great harm to humans, aquatic products, and crops. It must be treated before reaching the standard. can discharge. However, the treatment of coking wastewater is still a worldwide problem. According to statistics, there are currently more than 1,300 coking enterprises in my country, and most of their coking wastewater treatment uses different forms of A / O process as the main process of biological treatment. It is very common for effluent COD to exceed the standard, so an effective advanced treatment process must be adopte...

AI Technical Summary

Problems solved by technology

[0007] In addition, in the process of advanced treatment of actual coking wastewater by catalytic ozonation, due to the complex and changeable composition of wastewater, the catalyst is easily deactivated, and the catalyst must be replaced after deactivation

The reactor using granular catalyst must stop the reaction when the catalyst is replaced, and the quality of the effluent water is poor every time the reactor is started and shut down

Moreover, due to the relatively short research time of the catalytic ozonation process, the stability of the currently developed catalysts is generally not high, and the frequency of catalyst replacement is relatively high. The phenomenon of deterioration of the effluent water quality caused by start-up and shutdown is bound to be serious

[0008] In the prior art, there is no continuous processing device capable of applying powder catalysts

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