Free nitrous acid pretreatment of wasted activated sludge to exploit internal carbon source for enhanced denitrification
Free nitrous acid pretreatment of wasted activated sludge to exploit internal carbon source for enhanced denitrification
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废弃活性污泥游离亚硝酸预处理利用内部碳源强化反硝化
DOI：
10.1016/j.biortech.2014.11.054
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发表时间：
2015-03-01
影响因子：
11.4
通讯作者：
Wang, Yayi
中科院分区：
文献类型：
--
作者：
Ma, Bin;Peng, Yongzhen;Wang, Yayi
利用剩余活性污泥中的内源碳源有利于低碳氮比废水的脱氮，但往往受到污泥解体的限制。本研究提出了一种基于游离亚硝酸（FNA）预处理强化WAS中有机物释放的新策略。在FNA预处理过程中，当FNA浓度从0增加到2.04 mg HNO 2-N/L时，SCOD的产生量持续增加。当HNO 2-N浓度为2.04 mg/L时，经FNA预处理24 h的厌氧发酵反硝化反应器内碳源产量比未处理的厌氧发酵反硝化反应器内碳源产量提高了50%。这也使反硝化效率提高了76%，污泥减少了87.5%。更重要的是，由于FNA预处理的WAS可以提供更多的电子，因此在反硝化过程中温室气体一氧化二氮的产生得到了缓解。(C)2014爱思唯尔有限公司版权所有。
Using internal carbon source contained in waste activated sludge (WAS) is beneficial for nitrogen removal from wastewater with low carbon/nitrogen ratio, but it is usually limited by sludge disintegration. This study presented a novel strategy based on free nitrous acid (FNA) pretreatment to intensify the release of organic matters from WAS for enhanced denitrification. During FNA pretreatment, soluble chemical oxygen demand (SCOD) production kept increasing when FNA increased from 0 to 2.04 mg HNO2-N/L. Compared with untreated WAS, the internal carbon source production increased by 50% in a simultaneous fermentation and denitrification reactor fed with WAS pretreated by FNA for 24 h at 2.04 mg HNO2-N/L. This also increased denitrification efficiency by 76% and sludge reduction by 87.5%. More importantly, greenhouse gas nitrous oxide production in denitrification was alleviated since more electrons could be provided by FNA pretreated WAS. (C) 2014 Elsevier Ltd. All rights reserved.