厌氧缺氧好氧(国外英文资料).doc

厌氧缺氧好氧(国外英文资料) Anaerobic biological treatment is under anaerobic conditions, formed the anaerobic microorganisms need nutrition conditions and environmental conditions, using this kind of microbial decomposition of organic matter and wastewater process of methane and carbon dioxide. The process of anaerobic degradation of macromolecular organisms can be divided into four stages: hydrolysis, fermentation (or acidification), acetic acid stage and methane-producing phase. (1) the hydrolysis of hydrolysis can be defined as complex, insoluble polymers that are converted into simple solubilized monomers or dimers. (2) (or acidification) fermentation stage fermentation may be defined as organic compounds as electron acceptor and electron donor the biodegradation process of dissolving organic matter in the process, which is mainly composed of volatile fatty acid is converted to the end product, so the process is also called the acidification. (3) acetic acid production phase In producing hydrogen production under the action of acetic acid bacteria, a phase of the product is further converted into acetic acid, hydrogen, carbonate, and the new cell material. (4) in this phase of the methane phase, acetic acid, hydrogen, carbonic acid, formic acid and methanol are converted into methane, carbon dioxide and new cellular substances. The reaction in the acid pool is a part of the anaerobic reaction. An anaerobic pool is a reaction pool with no dissolved oxygen and no nitrates. A hypoxia pool is a reaction pool with no dissolved oxygen but with nitrates. Acidification pool - hydrolysis, acidification, acetic acid, limiting methanation, and low pH. Process simple, easy to control operation, can remove partial COD. Objective to improve biochemical properties; Anaerobic pool - hydrolysis, acidification, acetic acid, methanation synchronization. Need to adjust pH, not easy operation control, remove most COD. The goal is to remove COD. Anoxic pool - a hydrolyzed reaction, in which the