Application of combined partial nitritation and anammox process to the treatment of livestock manure digester liquor 部分亜硝酸化とアナモックスの組合せ法の畜産糞尿脱離液処理への適用

博士論文

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学位論文(Thesis)

Recently, a new segment of the nitrogen cycle, anaerobic ammonium oxidation (anammox), was discoverd. This reaction consists of the oxidation of ammonium to nitrogen gas using nitrite as electron acceptor under anaerobic conditions. This autotrophic process produces very little sludge and does not need supplementation of extra carbon sources, thus it reduces much treatment cost compared to the traditional method. For application of the anammox process to ammonium removal, only partial nitritation (PN) is required instead of complete nitrification. In order to make the stoichiometry in accordance with anammox reaction, it is desirable for PN of about 60% of the ammonium to nitrite. According to the merits mentioned above, the anammox process shows potential for nitrogen removal of wastewater. PN-anammox is a completely autotrophic system and is better suited for the treatment of high concentrations of ammonium in wastewaters. However, application of this process to the treatment of digester liquor of livestock manure has not been widely reported. Thus, PN-anammox process was applied to the treatment of digester liquor of livestock manure in this study.