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

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.