后置缺氧UCT分段进水工艺处理低C/N城市污水

王慰; 王淑莹; 张琼; 邢立群; 鲍方博; 彭永臻

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中国环境科学 ›› 2016, Vol. 36 ›› Issue (7) : 1997-2005.

水污染与控制

后置缺氧UCT分段进水工艺处理低C/N城市污水

王慰, 王淑莹, 张琼, 邢立群, 鲍方博, 彭永臻

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Post-anoxic UCT step-feed process in treating municipal wastwater with low C/N ratios

WANG Wei, WANG Shu-ying, ZHANG Qiong, XING Li-qun, BAO Fang-bo, PENG yong-zhen

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摘要

为处理低碳源生活污水，以内碳源反硝化途径为出发点，开发了后置缺氧UCT分段进水工艺.该工艺仅在UCT分段进水最后一好氧段末端增加了后置缺氧环节，以强化微生物内碳源储存能力.在低C/N水平（平均进水C/N=3.1±1.5）的生活污水条件下，后置缺氧UCT分段进水工艺实现了平均75.3%的TN去除率，运行61d后同步硝化反硝化去除的氮量高达31.5%；运行40d后污泥内碳源储存水平比原工艺污泥提高12.2%，9小时比内源反硝化速率由零提高至5.56mgN/（gVSS×d），系统可通过好氧段同步硝化内源反硝化（SNED）提高TN去除率.污泥沉降性能有明显改善：SVI值由350mL/g降至97mL/g，而原UCT分段进水工艺污泥仍然膨胀.该工艺仅在原工艺基础上增加了一后置缺氧段，无需外加碳源和额外硝化液回流设施，有利于水厂升级改造.

Abstract

To treat sewage with low carbon source, a post-anoxic UCT step-feed process was proposed in a endogenous denitrification perspective. This process only added an anoxia section after the last aerobic section of the original UCT step-feed reactor, to strengthen the microbial consortium's storage capacity of carbon source. Under a very low ratios level of C/N (average C/N=3.1±1.5) in the wastewater influence, the post-anoxic UCT step-feed process achieved an average 75.3% of the TN removal rate; After 61days' operation, nitrogen removal content via simultaneous nitrification and denitrification (SND) was as high as 31.5%. At 40 th day, the carbon source storage level in the sludge was 12.2% higher than that of the original process, and 9hours specific endogenous denitrification rate (SEDR) was increased from 0to 5.56mgN/(gVSS·d), the process improved the TN removal rate mainly by simultaneous nitrification and endogenous denitrification (SNED) in the aerobic zone. The performance of sludge settling was improved: SVI value decreased from 350mL/g to 97mL/g, while sludge bulking still remained in the original UCT step-feed process. This process only added an anoxia section in the original reactor, without additional carbon source or nitrate liquid recycling facilities, which is convenient for reconstruction of the wastewater treatment plants.

导出引用

王慰, 王淑莹, 张琼, 邢立群, 鲍方博, 彭永臻. 后置缺氧UCT分段进水工艺处理低C/N城市污水[J]. 中国环境科学. 2016, 36(7): 1997-2005

WANG Wei, WANG Shu-ying, ZHANG Qiong, XING Li-qun, BAO Fang-bo, PENG yong-zhen. Post-anoxic UCT step-feed process in treating municipal wastwater with low C/N ratios[J]. China Environmental Science. 2016, 36(7): 1997-2005

中图分类号： X703.1

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