期刊
BIORESOURCE TECHNOLOGY
卷 179, 期 -, 页码 20-25出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.11.054
关键词
Free nitrous acid; Waste activated sludge; Pretreatment; Fermentation; Denitrification
资金
- Natural Science Foundation of China [51478013]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF13005]
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.
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