引用本文:张衍,韩鹏,刘和,张丽慧,刘宏波,符波,等.蒸汽爆破对污泥和餐厨垃圾联合厌氧消化的促进效果[J].环境科学研究,2018,31(8):1471-1478.
ZHANG Yan,HAN Peng,LIU He,ZHANG Lihui,LIU Hongbo,FU Bo,et al.Enhancement of Anaerobic Co-Digestion of Sludge and Food Waste by Steam Explosion Pretreatment[J].Reserrch of Environmental Science,2018,31(8):1471-1478.]
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蒸汽爆破对污泥和餐厨垃圾联合厌氧消化的促进效果
张衍1,2,3, 韩鹏1, 刘和1,2,3, 张丽慧1, 刘宏波1,2,3, 符波1,2,3
1. 江南大学环境与土木工程学院, 江苏 无锡 214122;
2. 江苏省厌氧生物技术重点实验室, 江苏 无锡 214122;
3. 江苏省水处理技术与材料协同创新中心, 江苏 苏州 215011
摘要:
鉴于蒸汽爆破(简称"汽爆")预处理对污泥和餐厨垃圾联合厌氧消化的影响还鲜有报道,为探讨汽爆预处理对污泥和餐厨垃圾联合中温厌氧消化的促进效果及经济可行性,利用小型发酵罐在35℃下开展了未预处理污泥和餐厨垃圾联合消化、汽爆污泥单独消化、汽爆污泥和餐厨垃圾联合消化的试验,并进行能耗分析.结果表明,未预处理污泥与餐厨垃圾联合消化阶段,VS(挥发性固体)去除率为33.9%,沼气产率为311.0 mL/g(以投料VS计);汽爆污泥单独消化阶段,VS去除率和沼气产率均略高于未预处理污泥与餐厨垃圾联合消化阶段,但反应器ρ(NH4+-N)过高,影响产气稳定性,沼气φ(CH4)较低.汽爆污泥与餐厨垃圾联合消化阶段,VS去除率和沼气产率分别达到49.5%和420.5 mL/g,显著优于未预处理联合消化阶段.能耗分析表明,预处理的升温过程使汽爆预处理整体能耗偏高,但若能有效回收70%的热量,则汽爆预处理可提高污泥-餐厨垃圾联合中温厌氧消化工艺3.34 kW·h/t(以污泥量计)的能量产率.研究显示,汽爆预处理可提高污泥和餐厨垃圾联合中温厌氧消化工艺35.2%的沼气产率,但由于预处理能耗较高,预处理过程中热能的有效回收是汽爆预处理应用于污泥和餐厨垃圾联合中温厌氧消化经济可行的关键.
关键词:  联合厌氧消化  产甲烷  蒸汽爆破  剩余污泥  餐厨垃圾
DOI:10.13198/j.issn.1001-6929.2018.03.29
分类号:X705
基金项目:国家自然科学基金项目(No.51678280,51708253);江南大学自主科研计划重点项目(No.JUSRP51633B)
Enhancement of Anaerobic Co-Digestion of Sludge and Food Waste by Steam Explosion Pretreatment
ZHANG Yan1,2,3, HAN Peng1, LIU He1,2,3, ZHANG Lihui1, LIU Hongbo1,2,3, FU Bo1,2,3
1. School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;
2. Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China;
3. Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215011, China
Abstract:
The effect of steam explosion on anaerobic co-digestion of sludge and food waste has rarely been reported. To investigate the enhancement of mesophilic anaerobic co-digestion of sludge and food waste by steam explosion and its economic feasibility, the performance and energy productivity of digestion with combined substrate of un-pretreated sludge and food waste, steam exploded sludge, and combined substrate of steam exploded sludge and food waste with temperature of 35℃ in a lab-scale fermenter were evaluated. The digestion performance was unsatisfactory with volatile solids (VS) removal of 33.9% and biogas production rate of 311.0 mL/g (to fed VS), with the mixture of un-pretreated excess sludge and food waste as the substrate. With steam exploded sludge as the substrate, VS removal and biogas production rate were higher than that of the combined substrate of un-pretreated excess sludge and food waste. However, ammonia concentration in the reactor was higher, which probably influenced the stability of biogas production and resulted in a low methane content. With steam exploded sludge and food waste as the combined substrate, VS removal and biogas production rate achieved for 49.5% and 420.5 mL/g, respectively, which was significantly higher than that with un-pretreated sludge and food waste as the combined substrate. Energy analysis revealed that the demand of sludge heating resulted in a high energy consumption of steam explosion. However, if the heat could be recovered by 70%, steam explosion could improve energy production of co-digestion of excess sludge and food waste by 3.34 kW·h/t sludge. It could be conclude that steam explosion significate enhance biogas production rate of sludge and food waste co-digestion by 35.2%. However, owing to the high energy consumption of steam explosion, heat recovery efficiency during pretreatment is the key to make steam explosion economic feasible as the pretreatment process of sludge and food waste co-digestion.
Key words:  anaerobic co-digestion  methane production  steam explosion  excess sludge  food waste