中文关键词SBR运行模式生物脱氮胞外聚合物 英文关键词sequence batch reactor (SBR)operating modesbiological nitrogen removalextracellular polymeric substances

作者	单位	E-mail
孙洪伟	兰州交通大学环境与市政工程学院, 兰州 730070	shw@emails.bjut.edu
陈翠忠	兰州交通大学环境与市政工程学院, 兰州 730070
吴长峰	兰州威立雅水务(集团)有限责任公司, 兰州 730060
赵华南	兰州交通大学环境与市政工程学院, 兰州 730070
于雪	兰州交通大学环境与市政工程学院, 兰州 730070
方晓航	环境保护部华南环境科学研究所, 广州 510655	fangxiaohang@scies.org

中文摘要 以实际生活废水为处理对象，考察了SBR工艺好氧/缺氧（O/A）和缺氧/好氧（A/O）运行模式对生物脱氮性能、胞外聚合物（extracellular polymeric substance，EPS）及其组分（蛋白质PN、多糖PS和核酸DNA）的影响.结果表明，O/A和A/O运行模式下，SBR工艺均获得了高效稳定的NH₄⁺-N去除，去除率分别为97.5%和98.0%，且硝化速率与NH₄⁺-N负荷呈现较好正相关性.交替缺氧/好氧运行模式对于EPS影响，A/O模式下EPS产量略高于O/A模式下，且运行模式对TB-EPS及其组分（PN、PS和DNA）产量无显著影响，但A/O模式下LB-EPS及其组分（PN和PS）产量均高于O/A模式下，倍数介于1.38~1.56之间.2种模式条件下，PS是TB-EPS和EPS的主要组分，而PN是LB-EPS的主要成分.EPS含量与污泥沉降性能具有良好的线性正相关. 英文摘要 Nitrogen removal, extracellular polymeric substances (EPS), and the chemical composition (protein (PN), polysaccharide (PS), and DNA) by the aerobic/anoxic (O/A) and the anoxic/aerobic (A/O) modes were studied in a sequencing batch reactor (SBR) fed with domestic wastewater. The results showed that the removal rates of NH₄⁺-N were 97.5% and 98.0% in the two operating modes, respectively, and a removal efficiency of NH₄⁺-N with high efficiency and stability was obtained. The nitrification rate was positively correlated with the nitrogen loading ratio. The influence of operating modes for the alternating anoxic/oxic mode on extracellular polymeric substances of activated sludge was evaluated. The EPS constituent in the A/O mode was slightly higher than the O/A mode. The operating mode had no effect on the contents of PN, PS, and DNA in tightly bound EPS (TB-EPS) and TB-EPS. However, PN and PS in loosely bound EPS (LB-EPS) and LB-EPS in the A/O mode were 1.38 to 1.56 times those of the O/A mode. In the two operating modes, PSs were the main constituents in the TB-EPS and EPS, while PNs were the main constituents in LB-EPS. The EPS content had a good linear correlation with the sludge settling performance.

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