碳热还原铁基生物炭材料(BC-ZVI)对厨余垃圾厌氧消化的影响研究  

Effect of Zero-valent Iron Laden Biochar Obtained from Carbothermal Reduction on Anaerobic Digestion of Food Waste

作　　者：赵光琪 刘建国[1,4] 孔鑫 陈超 刘佃磊 ZHAO Guangqi;LIU Jianguo;KONG Xin;CHEN Chao;LIU Dianlei(School of Environment,Tsinghua University,Beijing 100084;Taiyuan University of Technology,Jinzhong Shanxi 030600;Chinese Academy of Environmental Sciences,Beijing 100020;Tsinghua Shenzhen International Graduate School,Shenzhen Guangdong 518055)

机构地区：[1]清华大学环境学院,北京100084 [2]太原理工大学,山西晋中030600 [3]中国环境科学研究院,北京100020 [4]清华大学深圳国际研究生院,广东深圳518055

出　　处：《环境卫生工程》2022年第3期1-7,共7页Environmental Sanitation Engineering

摘　　要：提升厨余垃圾厌氧反应器运行稳定性和物料产甲烷潜能是实现生活垃圾资源化利用的关键技术手段。本研究选取赤泥、废铁泥、污水厂污泥和废木料为原料,通过碳热还原法制备得到3种碳热还原铁基生物炭复合材料:碳还原赤泥(BC-ZVI1)、碳还原铁泥(BC-ZVI2)和碳还原芬顿污泥(BC-ZVI3),研究其作为添加剂对厨余垃圾厌氧消化产甲烷的促进作用。结果表明:与同类研究中常见的单独添加生物炭(BC)和零价铁(ZVI)相比,其中两种复合材料添加对厨余垃圾厌氧消化产甲烷具有更为显著的促进作用,BC-ZVI1的促进效果最佳。在有机容积负荷(以VS计)为14.07 g/L,接种比I/S为1:2,BC-ZVI1投加量(以VS计)为0.4 g/g的条件下,BC-ZVI1组甲烷产率(以VS计)达到310.66 mL/g,比甲烷活性(以VS计)达到14.17 mL/(g·d),分别比单独添加BC和ZVI组提高36.57%、51.79%和64.77%、78.91%。BC-ZVI1对体系pH的缓冲、氨氮的去除以及丁酸向乙酸转化的促进作用是其促进厨余垃圾厌氧消化产甲烷的主要原因。Improving the operation stability of food waste anaerobic reactor and the methanogenic potential of materials is the key technical means to realize the resource utilization of domestic waste.The red mud,waste iron mud,sewage plant sludge and waste wood were selected as raw materials in this study,and three kinds of carbothermal reduction iron-based biochar composites were prepared by carbothermal reduction:carbon reduction red mud(BC-ZVI1),carbon reduction iron mud(BC-ZVI2)and carbon reduction fenton sludge(BC-ZVI3).And their promoting effect on anaerobic digestion and methanogenesis of food waste as additives was studied.The results showed that compared with the common addition of BC and ZVI alone in similar studies,the addition of two composite materials has a more significant effect on the anaerobic digestion and methanogenesis of food waste,and the promotion effect of BC-ZVI1 was the best.When the organic load(measured by VS)was 14.07 g/L,the inoculation ratio was I/S=1∶2,and the dosage of BC-ZVI1(measured by VS)was 0.4 g/g,the methane yield(measured by VS)and specific methane activity(measured by VS)of BC-ZVI1 group reached 310.66 mL/g and 14.17 mL/(g·d)respectively,which were 36.57%,51.79% and 64.77% and 78.91% higher than those of BC and ZVI group alone.The buffering effect of BC-ZVI1 on the pH of the system,the removal of ammonia nitrogen and the promotion of the conversion of butyric acid to acetic acid were the main reasons why BC-ZVI1 promoted the anaerobic digestion and methane production of food waste.

关 键 词：厨余垃圾 厌氧消化 碳热还原 甲烷产率 投加优化 

分 类 号：X799.3[环境科学与工程—环境工程]