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| Effect of initial pH on anaerobic digestionof waste activated sludge under direct electrical stimulation |
| CHEN Ying, YIN Chang-kai, ZHU Nan-wen, YUAN Hai-ping, LOU Zi-yang |
| School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract Batch tests were operated to investigate effects of initial pH (3,5,7,9,11) on anaerobic digestion of waste activated sludge under 0.6V direct electrical stimulation. Initial pH had a great influence on biogas production and VS removal efficiency. At the optimal initial pH of 9, maximum methane yield of 224mLCH4/g VS and VS removal efficiency of 38.1% were achieved after 32days digestion. Initial pH could accelerate hydrolysis and acidification process of waste activated sludge. Alkaline environment (pH 9, 11) enhanced SCOD and VFAs concentrations in suspensions, especially at pH 11. Acetic acid and butyric acid were dominant at pH 3and 11while acetic acid and propionic acid were main products at pH 5, 7 and 9. Initial pH facilitates release of ammonium from waste activated sludge and in acidic environment ammonium was released in excess.
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Received: 19 June 2015
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