Anaerobic-micro-aerobic membrane bioreactor and operation method thereof

Abstract

The present invention relates to an anaerobic-micro-aerobic membrane bioreactor and an operation method thereof, and belongs to the technical field of waste anaerobic biological treatment. The bioreactor combines an Upflow Anaerobic Sludge Bed body portion with a two stage membrane module, wherein the body portion comprises a granular sludge anaerobic reaction zone, a three-phase separator, a settling zone and a biogas collection system; and the two stage membrane module are an ultrafiltration membrane module and a nano filtration membrane module, respectively, and an aeration system is arranged at the bottom of the ultrafiltration membrane module. Concentrated water trapped by the ultrafiltration membrane module and the nano filtration membrane module flows back to the bottom of the settling zone, and in the micro-aerobic environment, hardly degradable organic matters are further degraded. The volume loading rate of the reactor in treating hardly degradable organic waste water of pharmacy and coal chemistry can reach about 15 kg COD / (m<3>.d). The anaerobic-micro-aerobic membrane bioreactor and the operation method of the present invention solve the problems that in the prior art when the efficient anaerobic reactors represented by UASB treat hardly degradable waste water, the hydraulic retention time is long, the effect is not ideal, the conventional anaerobic membrane bioreactors have significant membrane contamination, and the hardly degradable organics removal effect is poor.

Description

Technical field [0001] The invention relates to an anaerobic-microoxygen membrane bioreactor and an operating method thereof, belonging to the technical field of wastewater anaerobic biological treatment. Background technique [0002] High-concentration, refractory organic industrial wastewater has high yield and great environmental hazards, and the cost of purely using aerobic biological technology or physical and chemical technology is too high. The use of anaerobic treatment technology can not only significantly reduce the cost of wastewater treatment, but also recover energy. [0003] With an upflow anaerobic sludge bed (UASB) reactor (such as figure 1 The high-efficiency anaerobic reactor represented by the anaerobic reactor overcomes the shortcomings of traditional anaerobic reactors of low load and long hydraulic retention time (typically ranging from dozens of days to dozens of days), and significantly reduces hydraulic retention time (generally only For hours to days), th...

AI Technical Summary

Problems solved by technology

Anaerobic membrane bioreactors usually use biogas backflow to control membrane fouling, but biogas itself is a flammable gas with high safety requirements, and the cost of biogas to control membrane fouling is higher than that of air

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