餐厨垃圾固渣厌氧发酵产甲烷潜力及Logistic动力学研究  

Study on the methane potential and Logistic kinetics of the solid residual kitchen waste via the anaerobic digestion

作　　者：高树梅[1,2] 赵明星[1] 许之扬[1] 余益辉[1] 王永会[1] 黄振兴[1] 阮文权[1] 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]嘉兴学院生物与化学工程学院,浙江嘉兴314001

出　　处：《安全与环境学报》2015年第1期263-268,共6页Journal of Safety and Environment

基　　金：国家自然科学基金项目(21276114);国家科技支撑计划项目(2012BAC18B01-2);江苏省科技支撑计划项目(BE2012615)

摘　　要：为考察餐厨垃圾经提炼生物柴油处理后的固渣厌氧生物处理的可行性,在中温条件下,研究固渣批式厌氧发酵的产气特性和物质转化过程,并结合Logistic方程分析该固渣厌氧消化产甲烷的动力学过程。结果表明,该固渣具有较高的厌氧发酵产甲烷潜力,在2∶1的物料比条件下,单位质量固渣产气效率最高,甲烷产量达633 Nm L/g VS。稳定状态下,Logistic方程可以较好地分析餐厨垃圾固渣厌氧发酵产甲烷过程(决定系数R2>0.99),经过拟合,产甲烷潜力为661.33 Nm L/g VS,最大产甲烷速率为106.78 Nm L/(g VS·d),无滞后期,与试验结果基本一致。随底物负荷提高,总挥发性脂肪酸和氨氮的质量浓度分别达到14 800 mg/L、2 500mg/L,p H值降至5.0左右,产甲烷菌活性受到总挥发性脂肪酸(VFAs)、高浓度氨氮(NH+4-N)及低p H值的严重抑制。This paper takes it as its objective to study the methane potential and Logistic kinetics regularity of the solid residual kitchen waste via the anaerobic digestion. While trying to evaluate the methane potential from the solid residual kitchen waste through the anaerobic biological processing,we have conducted a series of batch mesophilic（41 ± 1） ℃ anaerobic digestions in hoping to disclose the methane production characteristic features and the substrate transformation mechanism behind the physical treatment. In so doing,we have discussed the underlying kinetics mechanism of the anaerobic digestion process via the Logistic Equation. The results of our observation,investigation and scientific analysis demonstrate that the solid residual of kitchen waste enjoys a great methane production potential,which can be made released through a process of 6-9 days as the anaerobic digestion time. As the result,the maximum specific methane yield which can be gained from the batch anerobic digestion assay should be633 Nm L / g VS at the inoculum substrate ratio（ISR） 2： 1. What is more,with the increase of the substrate loading,the special methane yield gradually tends to begin to decrease in the following sequence,such as 494 Nm L / g VS at ISR 1： 1,459 Nm L / g VS at ISR 2： 3,207 Nm L / g VS at ISR 1： 2,and 51 Nm L / g VS at ISR2： 5,respectively. At the same time,the methanogens tends to get inhibited when the substrate loading becomes greater than 50 g TS / L,i. e. ISR≥1： 2. And,then,the Logistic equation would be likely to be made to appropriately fit the cumulative methane yield in a steady state（ISR≤2： 3） with R2 0. 99. At the same time,it would be possible to make the methane yield obtained from Logistic equation to its maximum limit to 661. 33 Nm L / g VS,at the maximum methane yielding rate of 106. 78 Nm L / g VS / d with no lag phase. These fitting parameters at this stage tend to be close to the experiment results. Furthermore,the p H value in the anaerbic digestion process tends to d

关 键 词：环境工程学 餐厨垃圾固渣 厌氧发酵 甲烷 LOGISTIC方程 

分 类 号：X705[环境科学与工程—环境工程]