The effect of acid pretreatment on the anaerobic digestion and dewatering of waste activated sludge

被引:211
作者
Devlin, D. C. [1 ]
Esteves, S. R. R. [1 ]
Dinsdale, R. M. [1 ]
Guwy, A. J. [1 ]
机构
[1] Univ Glamorgan, Sustainable Environm Res Ctr, Pontypridd CF37 4AT, M Glam, Wales
基金
英国工程与自然科学研究理事会;
关键词
Biosolids; Methane yield; Oxitop; Pretreatment; Waste activated sludge; DISINTEGRATION; HYDROLYSIS; EXTRACTION;
D O I
10.1016/j.biortech.2010.12.043
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Waste activated sludge (WAS) is difficult to degrade in anaerobic digestion systems and pretreatments have been shown to speed up the hydrolysis stage. Here the effects of acid pretreatment (pH 6-1) using HCl on subsequent digestion and dewatering of WAS have been investigated. Optimisation of acid dosing was performed considering digestibility benefits and level of acid required. Pretreatment to pH 2 was concluded to be the most effective. In batch digestion this yielded the same biogas after 13 days as compared to untreated WAS at 21 days digestion. In semi-continuous digestion experiments (12 day hydraulic retention time at 35 degrees C) it resulted in a 14.3% increase in methane yield compared to untreated WAS, also Salmonella was eradicated in the digestate. Dewatering investigations suggested that the acid pretreated WAS required 40% less cationic polymer addition to achieve the same cake solid content. A cost analysis was also carried out. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4076 / 4082
页数:7
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