Membrane bioreactor for anaerobic ammonia oxidation and methanogenesis synchronously and waste water treatment method

Abstract

The invention discloses a membrane bioreactor for anaerobic ammonia oxidation and methanogenesis synchronously and a waste water treatment method. The method comprises the following steps: conveying diluted sewage to an anaerobic methanogenesis reactor; inputting a microbial carrier, the pore diameter of which is 1-10 [mu]m and the porosity of which exceeds 80%, into the anaerobic methanogenesis reactor; after domestication of anaerobic ammonium oxidation bacteria on the microbial carrier, converting nitrite nitrogen and ammonia nitrogen in sewage into nitrogen and nitrate nitrogen; communicating an aerobic zone and an anoxic zone of activated sludge by a first reflux path; communicating an anaerobic zone and the anoxic zone of activated sludge by a second reflux path; communicating the anoxic zone and the aerobic zone of activated sludge by a third reflux path; refluxing a sludge mixed solution in the anoxic zone of the activated sludge to the water return ports of the anaerobic methanogenesis reactor, the anaerobic zone of activated sludge and the anoxic zone of the activated sludge through the first, second and third reflux paths, wherein three processes: hydrolytic acidification, acid production and methanogenesis of sewage and activated sludge in anaerobic conditions are carried out.

Description

technical field [0001] The invention relates to the field of sewage treatment systems, in particular to a membrane bioreactor for synchronous anaerobic ammonium oxidation and methane production and a wastewater treatment method. Background technique [0002] Sewage from pig farms contains high concentrations of organic matter, the chemical oxygen demand is as high as 8000mg(COD) / L, and it also contains a large amount of nutrients such as nitrogen and phosphorus. The total nitrogen content can be as high as 1900mg(N) / L, and the total phosphorus content can be as high as 150mg( P) / L. Once the pig farm sewage enters the surface water body, it will cause severe hypoxia in the surface water body, the death of aquatic organisms, and also cause eutrophication of the water body, and cause environmental impacts such as soil and groundwater pollution. [0003] At present, the treatment of pig farm sewage mainly includes biological treatment methods such as anaerobic digestion and aer...

AI Technical Summary

Problems solved by technology

This biological treatment process is often difficult to work. The reason is that the high concentration of ammonium nitrogen in the pig farm sewage affects the biological activity of the aerobic activated sludge process. In the anaerobic digester, a large amount of organic matter is converted by anaerobic bacteria into Methane and carbon dioxide, the concentration of organic matter in the anaerobic effluent is significantly reduced, and the series of metabolic reactions of anaerobic digestion cannot remove ammonium nitrogen in the water body. On the contrary, the hydrolysis reaction decomposes the influent suspended matter into ammonium and dissolved organic matter, so that the anaerobic digestion tank The ammonium concentration in the effluent does not fall but rises

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