期刊
BIORESOURCE TECHNOLOGY
卷 304, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123006
关键词
Waste activated sludge; Free nitrous acid; Electrochemical; Anaerobic digestion; Methane production
资金
- Distinguished Professor in Universities of Shanghai (Oriental Scholar) [TP2017041]
- ECNU Academic Innovation Promotion Program for Excellent Doctoral Students [YBNLTS2019-016]
- Fundamental Research Funds for the Central Universities
- Shanghai Yangfan Program [19YF1414000]
- Shanghai Institute of Pollution Control and Ecological Security
Free nitrous acid based pretreatments are novel and effective chemical strategies for enhancing waste activated sludge solubilization. In this study, the synergetic effects of the combined free nitrous acid and electrochemical pretreatment on sludge solubilization and subsequent methane productivity were evaluated. The results indicated that pretreatment with 10 V plus 14.17 mg N/L substantially enhanced sludge solubilization, with the highest soluble chemical oxygen demand concentration of 3296.7 mg/L, 25.6-time higher than that without pretreatment (128.9 mg/L). Due to the potential toxicity of NO2- and NO3- to microorganisms and its bio-processes, the methane production of sludge pretreated by free nitrous acid was significantly deteriorated. The maximum methane yield (152.0 +/- 9.6 mL/g-VSadded) was observed at 10 V pretreatment alone, only 1.7% higher than that of the control (149.4 +/- 1.6 mL/g-VSadded). Combined pretreatment indeed enhances the sludge solubilization and hydrolysis, but does not always induce an improved anaerobic digestion efficiency.
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