Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment
Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment
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DOI：
10.1016/j.bej.2014.05.010
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发表时间：
2014-09-15
影响因子：
3.9
通讯作者：
Pak, Daewon
中科院分区：
文献类型：
--
作者：
Yang, Hong Gyu;Chun, Hae Yeun;Pak, Daewon
近年来，由于对可再生能源资源的高需求，从污泥生物质中回收生物能引起了越来越多的关注。为了提高污泥生物质的产甲烷率，电化学处理可以作为一种新型有效的污泥生物质水解预处理方法。本研究采用电气浮-电氧化联合预处理的方法来提高污泥生物质的厌氧降解性能。电浮选在分离混合液中的絮体方面是有效的，并且在4.72 mA cm（-2）的电流密度下操作10 min后导致大于60%的污泥体积减少。以IrO 2/Ti为阳极，在9.45mA·cm（-2）的电流密度下，对污泥进行电氧化处理，30 min后COD溶解率提高了30%。考察了阳极和阴极之间的差距、电流密度和外加电压等因素对电氧化的影响，优化了操作条件。生化甲烷势测定结果表明，电气浮-电氧化联合预处理提高了污泥的厌氧可生化性。(C)2014爱思唯尔有限公司版权所有。
Recently, bioenergy recovery from sludge biomass has attracted increasing attention due to the high demand for renewable energy resources. In order to enhance methane production from sludge biomass, electrochemical treatment can be used as a novel and efficient pretreatment for the hydrolysis of sludge biomass. In this study, a combined electro-flotation and electro-oxidation pretreatment was employed to improve the anaerobic degradability of sludge biomass. Electro-flotation was efficient in separating flocs in the mixed liquor and led to a sludge volume reduction greater than 60% after 10 min of operation at a current density of 4.72 mA cm(-2). Electro-oxidation using IrO2/Ti anode was performed to improve the anaerobic degradability of sludge and resulted in a 30% increase in COD solubilization after 30 min of operation at current density of 9.45 mA cm(-2). The factors affecting electro-oxidation, i.e. the gap width between anode and cathode, current density and applied voltage, were investigated to optimize the operating conditions. A biochemical methane potential assay demonstrated that the anaerobic biodegradability of sludge was enhanced by combined electro-flotation and electro-oxidation pretreatment. (C) 2014 Elsevier B.V. All rights reserved.