Two-stage fluidized bed-membrane bioreactor and method of treating coking wastewater by using two-stage fluidized bed-membrane bioreactor

Abstract

The invention discloses a two-stage fluidized bed-membrane bioreactor and a method of treating coking wastewater by using the two-stage fluidized bed-membrane bioreactor, relating to a membrane bioreactor and a method of treating coking wastewater, and solving the technical problem of the existing method that emission of ammonia nitrogen and COD (Chemical Oxygen Demand) after treatment does not reach the standard. The two-stage fluidized bed-membrane bioreactor comprises a first-stage granular active carbon fluidized bed, a second-stage clinoptilolite fluidized bed, a refluxing device, a membrane component and an aeration device. The method of treating the coking wastewater comprises the steps that phenols and the like in the coking wastewater are removed through the first-stage granular active carbon fluidized bed firstly; then ammonia nitrogen is removed out of the coking wastewater in the second-stage clinoptilolite fluidized bed; the coking wastewater enters an aerobiotic membrane bioreactor to retaining, degrading and removing organic matters; and finally, the coking wastewater is discharged and enters into a clean water basin under the pumping action of a suction pump. With the adoption of the two-stage fluidized bed-membrane bioreactor and the method, the hydraulic retention time is shortened, the occupied area is small, and the quality of discharged water is improved and can reach the standard of Reuse Of Recycling Water For Urban-Water Quality Standard For Urban Miscellaneous Water Consumption.

Description

technical field [0001] The invention relates to a method for treating coking wastewater. Background technique [0002] The coking wastewater mainly comes from the production water and steam condensation wastewater in the primary cooling of coke oven gas and coking production. COD, NH of coking wastewater 4 + -N concentration is high, the composition of organic matter is complex, there are many kinds of components, and the concentration of pollutants is high. Among them, inorganic pollutants mainly include: NH 4 + -N, S 2- 、SCN - 、CN - Organic pollutants include: basic substances such as phenols, pyridine, aniline, quinoline, and carbazole, and also contain a large amount of single-ring aromatic compounds and biologically refractory substances such as PAH (condensed ring aromatic hydrocarbons) and heterocyclic aromatic hydrocarbons. [0003] "Comprehensive Wastewater Discharge Standard" (GB8978-96) requires coking wastewater effluent quality NH 4 + -N<15mg / L, COD...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for treating coking wastewater using a two-stage fluidized bed-membrane bioreactor in order to solve the technical problem that ammonia nitrogen and COD emissions are not up to standard after being treated by the existing method

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