不同固含量和温度下废污泥厌氧消化水葫芦的优化及微生物群落分析

Gülşah Öztep, Tülay Güngören-Madenoğlu, Güven Özdemir, Eda Işık, Habibe Serez, Nalan Kabay, Mithat Yüksel
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引用次数: 0

摘要

在不同的溶出液总固含量(3.3、4.3、5.3、6.3、7.3和8.3%)和溶出温度(35、40、45、50和55℃)下,研究了水葫芦与废污泥厌氧消化的最佳操作条件,以获得高产甲烷。在TS含量为6.3%、消化温度为35℃的条件下,实验获得的最高沼气产量为163.2 mL/g TVS (CH4含量高达81.1 vol%)。采用修正的Gompertz、Cone和一阶动力学模型对动力学参数进行估计,其中修正的Gompertz模型拟合误差最小(-1.0 ~ 3.7%)。采用Ratkowsky模型模拟温度对甲烷产率的影响,发现在温度为41.5 ~ 44℃时,甲烷产率为6.3%,实验甲烷产率为61.9 ~ 132.3 mL CH4/g TVS。宏基因组测序用于表征厌氧消化在不同条件下的微生物群落结构,醋酸分解/氢营养产甲烷同样占主导地位的产甲烷途径。细菌数量最多的是变形菌门、厚壁菌门、绿菌门和放线菌门。α多样性指数表明,消化温度对微生物丰富度和多样性的影响大于TS含量的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization and Microbial Community Analysis for Anaerobic Digestion of Water Hyacinth (Eichhornia crassipes) with Waste Sludge at Different Solid Contents and Temperatures
In this study, optimum operating conditions for anaerobic digestion of water hyacinth (Eichhornia crassipes) with waste sludge was investigated at varying total solid (TS) content of the digestion solution (3.3, 4.3, 5.3, 6.3, 7.3 and 8.3%) and digestion temperature (35, 40, 45, 50 and 55 °C) to produce methane with high yield. The highest biogas yield reached experimentally was 163.2 mL/g TVS (with high CH4 content of 81.1 vol%) at 6.3% of TS content and digestion temperature of 35 °C. Kinetic parameters were estimated by using modified Gompertz, Cone and first-order kinetic models in which modified Gompertz model gave the lowest fitting errors (-1.0–3.7%). The effect of temperature on methane production rate was simulated by Ratkowsky model and optimum digestion temperature was found between 41.5 and 44 °C for maximum methane production at 6.3% TS. The experimental methane yields were 61.9–132.3 mL CH4/g TVS. The metagenomic sequencing was used to characterize microbial community structure of the anaerobic digestate at varying conditions and acetoclastic/hydrogenothrophic methanogenesis was equally dominated methane-producing pathways. The most abundant bacterial populations were found to be Proteobacteria, Firmicutes, Chloroflexi and Actinobacteria. Based on alpha diversity indices, it can be concluded that effect of digestion temperature on microbial richness and diversity was higher than the effect of TS content.
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