Gong Lei, Yang Xiaoqi, Wang Zaizhao, Zhou Jun, You Xiaogang
College of Environmental and Safety Engineering, Qingdao University of Science and Technology 53, Zhengzhou Road Qingdao Shandong Province 266042 China
RSC Adv. 2019 Jun 18;9(33):19104-19113. doi: 10.1039/c9ra01662g. eCollection 2019 Jun 14.
This study is an assessment of hydrothermal pre-treatment (HTP) of different solid-liquid ratio (SLR) sewage sludge for enhancement of biogas production by anaerobic digestion. Anaerobic digestion efficacy was investigated by biochemical methane potential (BMP) tests and kinetic analyses. The results indicated that the solid-liquid ratio (SLR) of sludge could influence the COD solubilization and the concentration of volatile fatty acids (VFAs) after HTP. BMP tests revealed that HTP could improve the final methane yield. For the different solid-liquid ratios (5%, 8%, 10%, 12% and 15%) of sludge after HTP, the methane contents were found to be 64%, 66%, 62%, 61% and 60%, respectively. The optimum solid-liquid ratio was found to be 8%, and its cumulative biogas yield was 425.57 N ml g VS. The modified Gompertz model and Logistic model were used for kinetic study of biogas production. Kinetic study results showed that the experimental data could be fitted with the two models and the modified Gompertz model was better fitted with the experimental data than the Logistic model. These findings proved that choosing an appropriate solid-liquid ratio for HTP could effectively improve the anaerobic digestion process of sewage sludge.
本研究旨在评估不同固液比（SLR）的污水污泥进行水热预处理（HTP）对厌氧消化产沼气的增强效果。通过生化甲烷潜力（BMP）测试和动力学分析研究厌氧消化效率。结果表明，污泥的固液比（SLR）会影响水热预处理后的化学需氧量（COD）溶解率和挥发性脂肪酸（VFA）浓度。BMP测试表明，水热预处理可提高最终甲烷产量。对于水热预处理后不同固液比（5%、8%、10%、12%和15%）的污泥，发现甲烷含量分别为64%、66%、62%、61%和60%。最佳固液比为8%，其累积沼气产量为425.57 N ml/g VS。采用修正的Gompertz模型和Logistic模型对沼气生产进行动力学研究。动力学研究结果表明，实验数据能与这两个模型拟合，且修正的Gompertz模型比Logistic模型对实验数据的拟合效果更好。这些发现证明，为水热预处理选择合适的固液比可有效改善污水污泥的厌氧消化过程。
