Method and device for treating leachate MBR effluent through combination of ozone-catalyzed oxidation and aeration biological filter towers

Abstract

The invention provides a method for treating leachate MBR effluent through combination of ozone-catalyzed oxidation and aeration biological filter towers. The method comprises carrying out gas-liquidmixing on leachate MBR effluent and ozone according to a reaction ratio through an injector, mixing the gas-liquid mixture and a circulation fluid, mixing the mixture and hydrogen peroxide according to a reaction ratio through a static mixer, feeding the final mixed liquid into an ozone-catalyzed oxidation tower through a lower water inlet, feeding the tail gas discharged through a top tail gas outlet into an ozone decomposing device, carrying out treatment, carrying out gas-liquid mixing through the injector, feeding the gas-liquid mixture into a biological filter tower through a low water inlet, and carrying out treatment through the biological filter tower so that the product water can stably satisfy the municipal solid waste landfill pollution control standard (GB 16889-2008) in the fig 2. The method realizes full treatment on leachate MBR, solves the problem that the prior art is difficult to treat a thick membrane liquid and realizes the efficient and comprehensive utilization ofozone.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for synergistically treating leachate MBR effluent by ozone catalytic oxidation and aerated biological filter tower. Background technique [0002] Membrane bioreactor (MBR) has the advantages of small footprint, good effluent quality, and low sludge production. In recent years, with the deepening of its research and the expansion of its application, the MBR process has been gradually applied to the treatment of landfill leachate. . However, since landfill leachate is a kind of wastewater with complex components and high concentration of organic matter, and contains a large amount of refractory biodegradable substances, it is still difficult to achieve satisfactory treatment results by relying solely on the biochemical treatment centered on the MBR process, so additional follow-up treatment is still needed measures to meet emission standards. In China, nano...

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Problems solved by technology

[0003] (1) The membrane advanced treatment process will produce a certain amount of membrane concentrate, which is about 20% of the influent scale. At present, the concentrate treatment is the main bottleneck in the leachate treatment process

[0004] (2) Due to the poor water quality, the subsequent advanced treatment membrane elements are seriously fouled, resulting in a greatly reduced system water production rate and serious deterioration of the water quality.

[0005] (3) Membrane elements are replaced frequently, resulting in a further increase in operating costs

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