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| Migration and transformation and utilization of organic matter in A2/O-MBBR denitrifying phosphorus removal process |
| ZHANG Miao1, ZHANG Ying2, HUANG Peng-lan2, HE Cheng-da1, PENG Yong-zhen3, WU Jun1 |
1. College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China;
2. Yangzhou Jieyuan Drainage Company Limited, Yangzhou 225002, China;
3. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China |
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Abstract A two-sludge system combined anaerobic/anoxic/oxic with moving bed biofilm reactor (A2/O-MBBR) was used to treat real domestic wastewater. By adding sodium acetate to adjust influent carbon/nitrogen ratio (C/N), the transformation and utilization and metabolic pathways of organic matter in the system were investigated. When the influent C/N ratio varied from 3.11 to 6.09, the system all achieved efficient COD removal with the maximum removal of 83.85%. However, from the perspective of VFA and PHAs transformation, the influent C/N ratio should not exceed 5.42. Additionally, the material balance analysis of carbon also revealed that when the influent C/N ratio was below 5.42, COD removal percentage in the A2/O reactor was up to 70.10% and that in the MBBR reactor only accounted for 4.32%~5.89%, where the efficient utilization of carbon source was the key to improve microbial community optimization and enhance denitrification and phosphorus removals under the condition of low C/N ratio. The results of dissolved carbon source component distribution and three-dimensional fluorescence properties manifested that proteins and polysaccharides transformed although COD changed gently along the reactor, in which proteins-like substance was the dominant.
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Received: 08 May 2017
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