Baffling type ozone pre-oxidation combined biological filter advanced treatment method

Abstract

The invention discloses a baffling type ozone pre-oxidation combined biological filter advanced treatment method. The method is characterized in that an ozone oxidation and tail gas utilization technology is combined with a biological filter for advanced treatment on wastewater, the wastewater and ozone are mixed by a supercharged jet mixer and then enter an ozone pre-oxidation unit for pre-oxidation, then the waste water enters a tail gas treatment tower for gas-water separation so that decomposition and damage of residual ozone in the waste water and tail gas are completed, effluent and tailgas of the tail gas treatment tower are pressurized by a pipeline booster pump and a venturi ejector to be atomized at a high speed and then enter a biological treatment unit, and final biodegradation of pollutants in the wastewater is realized. The ozone pre-oxidation unit and the biological treatment unit are respectively formed by connecting a plurality of closed pre-oxidation towers and biological filtration towers in series through baffling, and oxygen required by the biological filtration towers is provided after tail gas of the ozone pre-oxidation unit is treated. The method provided by the invention can reduce the ozone dosage, and has the advantages of high ozone utilization efficiency, good wastewater treatment effect and efficient and stable system operation.

Description

technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and relates to a wastewater treatment technology, in particular to a baffle type ozone pre-oxidation combined biological filter deep treatment method. Background technique [0002] As a strong oxidizing substance, ozone has a high redox potential. Under the induction of catalyst, it can make the system generate hydroxyl radicals to realize the ring opening and chain breaking of refractory pollutants, thereby improving the biodegradability of wastewater; while aeration Biofilter integrates microbial treatment technology and filtration, which can effectively intercept and biodegrade particulate matter and pollutants. Therefore, in recent years, there have been many reports on the application of ozone oxidation combined with biological aerated filter for advanced sewage treatment. [0003] Because ozone is unstable in water, and its solubility is relatively low, and exc...

AI Technical Summary

Problems solved by technology

Patent application number 201410389599.2 discloses an advanced treatment method with built-in pre-oxidation biological aerated filter. This method is functionally similar to the multi-stage ozone-biological aerated filter technology. Through ozonated air stripping, multiple waste water is achieved. stage oxidation and biochemical cycle treatment, but this method has a large amount of ozone dosage, short contact time, low ozone utilization rate, and the wastewater directly enters the biological oxidation zone after catalytic oxidation, which is likely to have an impact on microorganisms

In addition, the tail gas still contains a large amount of ozone that needs to be discharged after tail gas treatment, which is likely to cause secondary pollution, while a large amount of high-concentration oxygen in the tail gas is directly discharged, which is not conducive to improving the utilization efficiency of the device and reducing operating costs

Patent application number 201810471649.X discloses a UV-ozone combined biological aerated filter device and a method of sewage treatment using the device. The method uses UV-enhanced ozone catalytic oxidation, and directly leads the tail gas of the ozone contact reaction tank to the The aerobic area of ​​the biological aerated filter is used to utilize the oxygen-containing tail gas. This method improves the ozone utilization rate to a certain extent, and saves cost and energy consumption through the reuse of the tail gas. However, there are still some obvious defects in this patented technology: ( 1) The normal pressure traditional contact tank is used, the dosage of ozone is large, and the utilization efficiency is low; (2) The contact time between ozone and wastewater is short, and the ozone dissolution efficiency is low; (3) The residual ozone in wastewater is easy to have an impact on subsequent microorganisms; ( 4) The direct application of ozone in the exhaust gas to biological aeration will have a strong impact on microorganisms and reduce the efficiency of biochemical degradation

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