The Research and Technology Center for Renewable Products and Energy, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand.
J Environ Manage. 2012 Jun 30;101:164-72. doi: 10.1016/j.jenvman.2012.01.031. Epub 2012 Mar 12.
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 g chemical oxygen demand (COD) L(-1) d(-1). The maximum methane yield of 0.32 L at Standard temperature and pressure (STP) g(-1) COD removal was achieved at an OLR of 1.6 g COD L(-1) d(-1) and the methane content was 54% on an average. At a higher organic loading rate of 5.4 g COD L(-1) d(-1), 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 g COD L(-1) d(-1) 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 L STP g(-1) COD removal was achieved at an OLR of 1.3 g COD L(-1) d(-1).
研究了废烹调油酯交换得到的甘油作为沼气生产主要碳源的潜力。甘油高度污染油和脂肪，并经硫酸预处理。使用葡萄糖作为碳源作为对照，我们比较了在合成培养基中酸处理甘油和酸处理甘油与猪粪混合的沼气生产。在合成培养基中添加酸处理甘油的厌氧消化在有机负荷率（OLR）为 1.3、1.6 和 2.6 g 化学需氧量（COD）L（-1）d（-1）之间是令人满意的。在 OLR 为 1.6 g COD L（-1）d（-1）时，最大甲烷产率为 0.32 L STP g（-1）COD 去除，甲烷含量平均为 54%。在更高的有机负荷率 5.4 g COD L（-1）d（-1）下，丙酸与乙酸的比值高于代谢失衡的临界阈值限制。还研究了在 COD 比为 80:20（甘油：猪粪）下用猪粪处理酸处理甘油的厌氧消化。在 COD 减少（>80%）和甲烷含量（平均为 62%）方面，在有机负荷率为 1.3、1.7、2.9 和 5.0 g COD L（-1）d（-1）之间，酸处理甘油与猪粪的厌氧消化是令人满意的。然而，在最高负荷下，沼气的产生速率被发现显著降低。在 OLR 为 1.3 g COD L（-1）d（-1）时，达到了 0.24 L STP g（-1）COD 去除的最大甲烷产率。
