生物炭负载纳米零价铁对厨余垃圾厌氧发酵性能的影响  

EFFECT OF BIOCHAR-nZVI ON PERFORMANCE OF FOOD WASTE ANAEROBIC DIGESTION

作　　者：王欣姿 王攀[1] 杨鑫玉 李英男 任连海[1] WANG Xinzi;WANG Pan;YANG Xinyu;LI Yingnan;REN Lianhai(School of Ecology and Environment,Beijing Technology and Business University,State Environmental Protection Key Laboratory of Food Chain Pollution Control,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京工商大学生态环境学院国家环境保护食品链污染防治重点实验室,北京100048

出　　处：《环境工程》2023年第8期154-161,共8页Environmental Engineering

基　　金：国家重点研发计划“固废资源化”重点专项(2019YFC1906303);国家自然科学基金项目(42007350);北京市自然科学基金项目(8202010)。

摘　　要：利用废弃甘蔗渣热解制备生物炭(BC),进而制备生物炭负载纳米零价铁(BC-nZVI)。在中温、高温条件下研究不同BC-nZVI投加量(0,0.1,0.5,1,2 g/L)对厨余垃圾厌氧发酵性能的影响及其促进机制。结果表明:投加BC-nZVI显著提高了厌氧发酵系统的甲烷累积产量,且缩短了发酵延滞期。在其投加量为0.5 g/L时效果最佳,中温、高温处理相比对照组分别提高了36.88%和45.55%。此外,利用结构方程模型探究了BC-nZVI对厨余垃圾厌氧发酵性能的影响机制。结果显示:发酵时间、NH_(4)^(+)-N、温度和BC-nZVI显著影响累积甲烷产量。BC-nZVI的多孔性结构对挥发性脂肪酸具有一定的缓冲作用,有利于维持系统稳定性,并为微生物提供生长位点。该成果可为厨余垃圾资源化利用提供科学依据,并为BC-nZVI强化厌氧发酵技术提供指导。In this study,biochar(BC)was prepared by pyrolysis of waste sugarcane bagasse and biochar loaded with nano-zero valent iron(BC-nZVI).The effects of different BC-nZVI dosages(0,0.1,0.5,1 and 2 g/L)on the performance of anaerobic digestion of food waste were investigated under medium and high-temperature conditions and their promotion mechanism was discussed.The results showed that the addition of BC-nZVI significantly increased the cumulative methane production of the anaerobic digestion system and reduced the fermentation delay period.The best results were obtained at 0.5 g/L,with an increase of 36.88%and 45.55%in the medium and high temperature treatments,respectively,compared to the control group.In addition,this study investigated the effect of BC-nZVI on the anaerobic digestion performance of food waste using structural equation modelling.The results showed that fermentation time,NH_(4)^(+)-N,temperature and BC-nZVI significantly affected the cumulative methane production.the porous structure of BC-nZVI has a buffering effect on volatile fatty acids,which helps maintain the system stability and provides growth sites for microorganisms.This study provides a scientific basis for the resource utilization of food waste and a guide for the enhanced anaerobic digestion technology of BC-nZVI.

关 键 词：厨余垃圾 厌氧发酵 生物炭负载纳米零价铁 甲烷 

分 类 号：TQ920.1[轻工技术与工程—发酵工程] X799.3[环境科学与工程—环境工程]