期刊
BIORESOURCE TECHNOLOGY
卷 256, 期 -, 页码 259-268出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.033
关键词
Nitrogen removal; Lactic acid-enriched fermentation liquid from food waste; Carbon source; Extracellular polymeric substances (EPS); Microbial community
资金
- National Program of Water Pollution Control in China [2013ZX07310-001]
- Natural Science Foundation of China [51508450]
- Program for Innovative Research Team in Shanxi Province [2013KCT-13]
- Fund for Postdoctoral Scientific Research Project of China [2015M582760XB]
In this study, nitrogen removal using the lactic acid fermentation products from food waste and other external chemical carbon sources (sodium acetate, sodium lactate and starch) was investigated. Similar to sodium acetate and lactate, the lactic acid-enriched fermentation liquid from food waste (FLFW) exhibited a high denitrification rate (5.5 mg NOx-N/(g-VSS h)) and potential (0.16 g NO3--N/g COD), and could achieve high NH4+-N and total nitrogen (TN) removal efficiencies during long-term operation. Using FLFW as supplementary carbon sources reduced the extracellular polymeric substances (EPS) content, improved the settleability and achieved a satisfactory biomass yield of activated sludge. Additionally, the increased microbial metabolic activity and bacterial community diversity and the accumulation of unique bacteria in the activated sludge cultured with FLFW further promoted the organics utilization rate and nitrogen removal efficiency, indicating that the FLFW prepared from solid waste was an ideal carbon source for wastewater treatment.
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