Membrane bioreactor and wastewater treatment method for simultaneous anammox and methane production

Abstract

The invention discloses a membrane bioreactor for simultaneous anaerobic ammonia oxidation and methane production and a wastewater treatment method. The sewage is diluted and then transported to an anaerobic methane production reactor. A microbial carrier with a porosity of 10 μm and a porosity of more than 80%. The anammox bacteria on the microbial carrier are used to convert nitrite nitrogen and ammonia nitrogen in sewage into nitrogen and nitrate nitrogen after domestication, and the first return path is connected. The activated sludge aerobic zone and the activated sludge anoxic zone, the second return path connects the activated sludge anaerobic zone and the activated sludge anoxic zone, and the third return path connects the activated sludge anoxic zone and the activated sludge aerobic zone zone, the sludge mixture in the activated sludge anoxic zone can be returned to the anaerobic methanogenesis reactor, activated sludge anaerobic zone, activated sludge through the first return path, the second return path and the third return path The return port of the anoxic zone enables sewage and activated sludge to undergo three processes of hydrolysis, acidification, acid production and methane production under anaerobic conditions.

Description

technical field [0001] The invention relates to the field of sewage treatment systems, in particular to a membrane bioreactor for simultaneous anaerobic ammonium oxidation and methane production and a wastewater treatment method. Background technique [0002] Pig farm sewage contains high concentrations of organic matter, with a chemical oxygen demand of up to 8000mg(COD) / L, as well as 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 sewage from pig farms enters the surface water, it will cause severe hypoxia in the surface water, the death of aquatic organisms, and also cause eutrophication of the water, resulting in soil and groundwater pollution and other environmental impacts. [0003] At present, the treatment of pig farm sewage mainly includes biological treatment methods such as anaerobic digestion and aerobic activated sludge...

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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