含固率和接种比对菜籽饼中温厌氧消化特性的影响  

Effects of Total Solid Content and Inoculation Ratio on Anaerobic Digestion of Rapeseed Cake

作　　者：熊荣波 柳丽 孟艳 李屹[1] 陈来生[1] 钟启文[1] 韩睿[1] XIONG Rongbo;LIU Li;MENG Yan;LI Yi;CHEN Laisheng;ZHONG Qiwen;HAN Rui(Qinghai Key Laboratory of Vegetable Genetics and Physiology,Academy of Agriculture and Forestry Sciences,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学农林科学院,青海省蔬菜遗传与生理重点实验室,青海西宁810016

出　　处：《环境科学研究》2022年第1期230-237,共8页Research of Environmental Sciences

基　　金：青海省自然科学基金项目(No.2021-ZJ-921);青海省科技厅重点实验室项目(No.2020-ZJ-Y02)。

摘　　要：为充分利用菜籽饼资源,采用全自动甲烷潜力测试系统,开展了不同含固率(2%、4%、6%、8%)和接种比(RIS=1.5、2.0、3.0)的中温批式菜籽饼厌氧发酵试验,分析了不同含固率和接种比对菜籽饼厌氧消化产甲烷特性的联合影响.结果表明:不同含固率和接种比均对发酵启动时间和累积甲烷产量产生影响,且接种比对厌氧消化产气特性的影响大于含固率.在试验研究参数范围内,接种比越大,发酵启动越快;接种比一定时,累积甲烷产量随含固率的增加呈先升高后降低的趋势;在高含固率条件下,累积甲烷产量随接种比的增加而增加.在接种比为3.0、含固率为6%时,获得最大累积甲烷产量,为507.31 mL/g(以VS计).动力学模型分析显示,各处理组均能较好地反映菜籽饼厌氧发酵的产甲烷规律;含固率一定时,接种比越大,产气滞留时间(λ)越短.同时,相比于其他发酵原料,菜籽饼作为厌氧消化原料的潜力较为明显.研究显示,不同含固率和接种比条件下菜籽饼的产甲烷性能差异较大,可为菜籽饼厌氧消化工艺的优化提供理论依据,从而提高菜籽饼资源的综合利用率.In order to explore the combined effect of solid content and inoculation ratio on the characteristics of methane production in rapeseed cake anaerobic digestion,this study carries out anaerobic fermentation experiments of rapeseed cake with different solid content(2%,4%,6%,8%)and inoculation ratio(R_(I/S)=1.5,2.0,3.0)at medium temperature using an automatic methane potential test system.The cumulative methane yield and production dynamics characteristics,as well as the various indicators of fermentation broth were analyzed.The results show that both solid content and inoculation ratio have an impact on the fermentation start-up time and cumulative methane production,and the inoculation ratio has a greater impact on the gas production characteristics of anaerobic digestion than the solid content.Within the range of experimental parameters,the larger the inoculation ratio,the faster the fermentation starts.When the inoculation ratio is constant,the cumulative methane production increases first and then decreases with the increase of the solid content.Under the condition of high solid content,the cumulative methane production increases with the increase of the inoculation ratio.When the inoculation ratio is 3.0 and the solid content is 6%,the maximum cumulative methane production is obtained,which is 507.31 mL/g(measured as VS).The kinetic model shows that all treatments can well reflect the methane production law of anaerobic fermentation of rapeseed cake.When the solid content is constant,the greater the inoculation ratio,the shorter the residence time of gas production.Compared with other fermentation raw materials,rapeseed cake has obvious potential as a raw material for anaerobic digestion.This study shows that the methane production performance of rapeseed cake varies greatly under different solid content and inoculation ratios,which can provide a theoretical basis for the optimization of rapeseed cake anaerobic digestion process,thereby improving the comprehensive utilization of rapeseed cake resources.

关 键 词：菜籽饼 厌氧消化 接种比 含固率 甲烷潜力 动力学 

分 类 号：X71[环境科学与工程—环境工程]