Anaerobic forward osmosis membrane bioreactor process for coupling electrochemical oxidation of ammonia nitrogen

Abstract

The invention provides an anaerobic forward osmosis membrane bioreactor process for coupling electrochemical oxidation of ammonia nitrogen, which belongs to the technical field of environmental engineering. A high-salt environment of a sodium chloride draw solution is utilized, a draw solution tank is used as an electrolytic tank, ammonia nitrogen which is not effectively intercepted by a forwardosmosis membrane is oxidized by an electrode and converted into nitrogen, and the effluent quality is improved. Compared with the conventional anaerobic forward osmosis membrane bioreactor process, the ammonia nitrogen removal efficiency provided in the invention is improved by 20%-25%. A stainless steel mesh cathode is tightly attached to the forward osmosis membrane and can improve the mass transfer effect of a membrane interface layer while serving as an electrode, and therefore the water flux is increased. The device adopts a separated structure, is divided into an anaerobic sludge mixed liquid chamber and a sodium chloride draw liquid chamber, and is simple to operate and convenient to maintain. The process has a wide application prospect, and can achieve the purposes of domestic sewage treatment and energy recovery by building a factory through coastal city site selection and utilizing easily available and recyclable seawater as a draw solution.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and relates to an anaerobic forward osmosis membrane bioreactor process coupled with electrochemical oxidation of ammonia nitrogen. Background technique [0002] Wastewater is rich in organic matter, and it is of great significance to solve the problems of water pollution and energy crisis if the biomass energy can be recovered. Anaerobic digestion is the use of facultative anaerobic bacteria and obligate anaerobic bacteria to degrade the organic matter in it to generate methane-rich biogas. Anaerobic membrane bioreactors can effectively intercept microorganisms, thereby improving effluent water quality and reducing excess sludge production. However, the membrane fouling in the anaerobic membrane bioreactor is serious, and a certain membrane driving pressure must be maintained in the mud-water separation process, and the poor interception effect on small molecular weight substan...

AI Technical Summary

Problems solved by technology

Using this method to design and construct an anaerobic forward osmosis membrane bioreactor device coupled with electrochemical oxidation of ammonia nitrogen, it effectively solved the problem of high ammonia nitrogen content in the effluent water of the anaerobic forward osmosis membrane bioreactor process, and achieved an increase in water flux. , while assisting in strengthening the anaerobic digestion methane production process

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