污泥回流比对分段进水A/O生物脱氮工艺的影响  

The influence of sludge recycle ratio on the step-feed A/O biological nitrogen removal process

作　　者：王伟[1] 彭永臻[1] 孙亚男[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复重点实验室,北京100022

出　　处：《中国环境科学》2008年第2期116-120,共5页China Environmental Science

基　　金：国家"863"项目(2006AA06Z319)

摘　　要：采用连续流分段进水缺氧/好氧(A/O)中试系统处理生活污水,研究污泥回流比(R)对系统性能的影响.结果表明,当R值高于1.0时,尽管第一段缺氧区的硝酸盐氮去除量明显增加,而系统硝化、反硝化效果均明显降低.当R为0.75时,系统总氮去除率最高,为92%;而当R值为1.5时,总氮去除率最低,为72%.当系统污泥沉降性能较好时,R值对二沉池泥泥位和泥水分离效果影响不大;而当污泥沉降性能较差时,二沉池泥位随R值增大而呈线性增加,此时提高R值会加剧污泥膨胀.此外,高R值使得系统各段悬浮固体浓度呈梯度分布的规律变得不再明显,降低系统污泥储量.同时,提高R值会降低系统固体停留时间,进而影响系统的污泥种群分布.The effect of sludge recycle ratio （R） on the performance of the system was investigated in a pilot-scale step-feed anoxic/oxic （A/O） nitrogen removal process for domestic wastewater treatment. Both the nitrification and denitrification performance decreased obviously, although the nitrate removal in the first anoxic zone was increased when the value of R was higher than 1.0. The highest and the lowest total nitrogen removal efficiency were achieved when the R were 0.75 and 1.5 respectively with the removal efficiency were 92% and 72% accordingly. When the settleability of the sludge was well, the R had no significant effect on the sludge level of clarifier and its separation, however, when the settleability of the sludge was not favored, with the increase of R, the level of sludge in clarifier was increased linearly and the problem of bulking sludge was exacerbated. In addition, the regulation of gradient distribution that the mixed liquid suspended sludge concentration at each stage has been not clear when the R was at higher level and the sludge reserves was decreased accordingly. Meanwhile, when the R was increased, the SRT was decreased accordingly, and the sludge population can be changed furthermore.

关 键 词：生活污水 生物脱氮 分段进水 污泥回流比 

分 类 号：X703[环境科学与工程—环境工程]