Anaerobic digestion of glycerol and co-digestion of glycerol and pig manure

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• 作者：Sasikarn Nuchdang^a ; ^b ; Chantaraporn Phalakornkule^a ; ^b ; ^{cphalak21@yahoo.com} ; ^{cpk@kmutnb.ac.th}
• 关键词：Glycerol ; Pig manure ; Biogas ; Anaerobic ; Co-digestion
• 刊名：Journal of Environmental Management
• 出版年：2012
• 期刊代码：82_03014797
• 类别：env
• 出版时间：30 June, 2012
• 卷：101
• 期：Complete
• 页码：164-172
• 文件大小：1126 K

摘要

The potential of glycerol obtained from transesterification of waste cooking oil as a main carbon source for biogas production was investigated. The glycerol was highly contaminated with oils and fats and was pretreated with sulfuric acid. Using a carbon source of glucose as a control, we compared biogas production from the acid-treated glycerol in a synthetic medium and the acid-treated glycerol mixed with pig manure. The anaerobic digestion of acid-treated glycerol with supplement in a synthetic medium was found to be satisfactory at organic loading rates (OLR) between 1.3, 1.6 and 2.6聽g chemical oxygen demand (COD) L^鈭? d^鈭?. The maximum methane yield of 0.32聽L at Standard temperature and pressure (STP) g^鈭? COD removal was achieved at an OLR of 1.6聽g COD聽L^鈭? d^鈭? and the methane content was 54%on an average. At a higher organic loading rate of 5.4聽g COD聽L^鈭? d^鈭?, the propionic acid to acetic acid ratio was higher than the critical threshold limit for metabolic imbalance. Anaerobic digestion of acid-treated glycerol with pig manure was also investigated at the COD ratio of 80:20 (glycerol:pig manure). The anaerobic digestion of acid-treated glycerol with pig manure was found to be satisfactory at organic loading rates between 1.3, 1.7, 2.9 and 5.0聽g COD聽L^鈭? d^鈭? in terms of COD reduction (>80%) and methane content of (62%on an average). However, the biogas production rate was found to significantly decrease at the highest load. The maximum methane yield of 0.24聽L STP聽g^鈭? COD removal was achieved at an OLR of 1.3聽g COD聽L^鈭? d^鈭?.