Optimization of selective sludge discharge mode for enhancing the stability of aerobic granular sludge process
Optimization of selective sludge discharge mode for enhancing the stability of aerobic granular sludge process
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DOI：
10.1016/j.cej.2012.11.132
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发表时间：
2013-02
影响因子：
15.1
通讯作者：
Liang Zhu;Yan-wen Yu;X. Dai;Xiang-yang Xu;Han-ying Qi
中科院分区：
文献类型：
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作者：
Liang Zhu;Yan-wen Yu;X. Dai;Xiang-yang Xu;Han-ying Qi
为提高好氧颗粒污泥工艺的长期稳定性，在好氧颗粒污泥反应器中进行了污泥选择性排放模式的研究。结果表明，在15d后污泥沉降时间为1min时，对生物反应器进行初步造粒处理，脱氮性能明显提高。细颗粒污泥形成后，控制污泥停留时间（SRT），排出颗粒污泥总量的5-10%，在srttotal5.3±0.4d、srtgranules9.9±0.9d和srtlocs2.7±0.5d下，NH4+ -N和TN的去除率分别达到95.9±2.0%和75.3±3.0%。生物反应器的颗粒率稳定在80±5.0%，平均粒径稳定在2.3±0.3mm。结果表明，颗粒污泥SRT过长容易导致好氧颗粒的变质，适当的选择性排泥方式通过比例老化颗粒污泥的排出和足够的新生絮凝体的保留有利于好氧颗粒污泥过程的稳定性。
The selective sludge discharge mode was studied in the aerobic granular sludge reactor for improving the long-term stability of aerobic granular sludge process. Results showed that the nitrogen removal performance was obviously improved with the preliminary granulation of the bioreactor at sludge settling time of 1min after 15days. After the formation of fine granular sludge, 5–10% volume of the total granular sludge was discharged for the sludge retention time (SRT) controlling, and the removal efficiencies of NH4+–N and TN reached 95.9±2.0% and 75.3±3.0% at the SRTTotalof 5.3±0.4days, SRTGranulesof 9.9±0.9days and SRTFlocsof 2.7±0.5days, respectively. The granular rate and average granular diameter of the bioreactor were stabilized at 80±5.0% and 2.3±0.3mm, respectively. The results demonstrated that a long SRT of granular sludge leads easily into the deterioration of aerobic granule, and an appropriate selective sludge discharge mode favors the stability of aerobic granular sludge process via the discharge of proportional aging granular sludge and retention of enough new-born flocs.