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Identification and metabolic mechanism of Non-fermentative Short-cut Denitrifying Phosphorus-removing Bacteria

Chinese Journal of Chemical Engineering 2013年第3期21卷 332-340页

作者：刘晖孙彦富贾晓珊李军周康群屈向东陶雪琴陈瑜 School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 China Department of Environment Science and Engineenng Zhongkai University of Agriculture and Engineering Guang- zhou 510225 China Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing Universityof Technology Beijing 100124 China

To investigate the characteristics and metabolic mechanism of short-cut denitrifying phospho- rus-removing bacteria （SDPB） that are capable of enhanced biological phosphorus removal （EBPR） using nitrite as an electron acceptor, an aerobic/anoxic sequencing batch reactor was operated under three phases. An SDPB-strain YC was screened after the sludge enrichment and was identified by morphological, physiological, biochemical properties and 16S rDNA gene sequence analysis. Denitrifying phosphorus-removing experiments were conducted to study anaerobic and anoxic metabolic mechanisms by analyzing the changes of chemical oxygen demand （COD）, phosphate, nitrite, poly-fl-hydroxybutyrate （PHB）, and glycogen. The results show that strain YC is a non-fermentative SDPB similar to Paracoccus denitrificans. As a kind of non-fermentative bacteria, the energy of strain YC was mainly generated from phosphorus release （96.2%） under anaerobic conditions with 0.32 mg P per mg synthesized PHB. Under anoxic conditions, strain YC accumulated 0.45 mg P per mg degraded PHB, which produced most of energy for phosphate accumulation （91.3%） and a little for glycogen synthesis （8.7%）. This metabolic mechanism of strain YC is different from that of traditional phosphorus-accumulating organisms （PAOs）. It is also found that PHB, a kind of intracellular polymer, plays a very important role in denitrifying and accumulating phosphorus by supplying sufficient energy for phosphorous accumulation and carbon sources for denitrification. Therefore, monitoring AP/APHB and ANO2 -N/APHB is more necessary than monitoring AP/ACOD, ANO2 -N/ACOD, or AP / ANO2 -N.

关键词： short-cut denitrifying phosphorus removing bacteria Paracoccus denitrificans non-fermentative bac- teria metabolic mechanism poly-fl-hydroxybutyrate

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