Effects of thermal and thermal-alkaline pretreatments on continuous anaerobic sludge digestion: Performance, energy balance and, enhancement mechanism

被引：58
作者：
Chen, Hong [1 ]
Yi, Hao [2 ]
Li, Hechao [3 ]
Guo, Xuesong [4 ]
Xiao, Benyi [4 ]
机构：
[1] Changsha Univ Sci & Technol, Sch Hydraul Engn, Key Lab Water Sediment Sci & Water Disaster Preve, Changsha 410004, Peoples R China
[2] Minist Environm Protect, South China Inst Environm Sci, Guangzhou 510655, Peoples R China
[3] Technol Review Ctr Shenzhen Habit & Environm, Shenzhen 518033, Peoples R China
[4] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
来源：
RENEWABLE ENERGY | 2020年 / 147卷
关键词：
Continuous anaerobic sludge digestion; Energy balance; Enhancement mechanism; Thermal pretreatment; Thermal-alkaline pretreatment; WASTE ACTIVATED-SLUDGE; WATER TREATMENT PLANTS; SEWAGE-SLUDGE; BIOGAS PRODUCTION; MICROALGAL BIOMASS; METHANE PRODUCTION; CO-DIGESTION; FOOD WASTE; HYDROLYSIS; SOLIDS;
D O I：
10.1016/j.renene.2019.10.051
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effects of thermal pretreatment (TP) and thermal-alkaline pretreatment (TAP) on a continuous mesophilic anaerobic digestion (AD) of sewage sludge were investigated. Both TP (134 +/- 1 degrees C and 30 min) and TAP (pH 12, 134 +/- degrees C and 30 min) released, hydrolyzed, and mineralized the organic matter of sludge, but TAP provided superior results. The methane yields of thermal pretreated sludge (TPS) and thermal-alkaline pretreated sludge (TAPS) were 1.88 times and 2.20 times that of raw sludge (RS), respectively. Moreover, the average methane content of biogas produced from TAPS (73.4 +/- 3.4%) was higher than that from TPS (69.1 +/- 3.1%) and from RS (67.2 +/- 2.9%). The energy balance of the total process with TAP was the highest (4.326 kJ/g VS) and that of the RS AD was the lowest (2.045 kJ/g VS). Both pretreatments enhanced the sludge hydrolysis with TAP presenting higher efficiency, and shifted the rate-limiting step of the anaerobic sludge digestion from hydrolysis to methanogenesis. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2409 / 2416
页数：8
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