Enhanced methane production from waste activated sludge by combining calcium peroxide with ultrasonic: Performance, mechanism, and implication

被引:56
|
作者
Li, Xiaoming [1 ,2 ]
Liu, Yu [1 ,2 ]
Xu, Qiuxiang [1 ,2 ]
Liu, Xuran [1 ,2 ]
Huang, Xiaoding [1 ,2 ]
Yang, Jingnan [1 ,2 ]
Wang, Dongbo [1 ,2 ]
Wang, Qilin [3 ]
Liu, Yiwen [3 ]
Yang, Qi [1 ,2 ]
机构
[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China
[3] Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
基金
中国国家自然科学基金;
关键词
Anaerobic digestion; Calcium peroxide; Methane production; Ultrasonic; Waste activated sludge; CHAIN FATTY-ACIDS; SUBSEQUENT ANAEROBIC-DIGESTION; PROMOTES HYDROGEN-PRODUCTION; FREE AMMONIA; SONIC PRETREATMENT; DARK FERMENTATION; IMPACT; CAO2; DEGRADATION; IRRADIATION;
D O I
10.1016/j.biortech.2019.01.115
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
This study reported a novel and high-efficient pretreatment method for anaerobic digestion, i.e., combining calcium peroxide (CaO2) with ultrasonic (US), by which not only the methane production was remarkably improved but also the removal of refractory organic contaminants was enhanced. Experimental results showed the optimum condition for methane production was achieved at 0.1 g CaO2/g VSS combined with US (1 W/ml, 10 min). Under this condition, the maximal methane yield of 211.90 +/- 2.6 L CH4/kg VSS was obtained after 36 d of anaerobic digestion, which was respectively 1.36-fold, 1.19-fold and 1.26-fold of that from the control, solo US (1 W/ml, 10 min) and solo CaO2 (0.1 g/g VSS). Mechanism investigations revealed that CaO2 + US not only improved the disintegration of waste activated sludge (WAS) but also increased the proportion of biodegradable organic matters. Moreover, the total frequency of recalcitrant contaminants contained in WAS decreased significantly when CaO2 + US was applied.
引用
收藏
页码:108 / 116
页数:9
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