Institute for Sustainability, Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA.
Institute for Sustainability, Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA.
Waste Manag. 2018 Jan;71:612-617. doi: 10.1016/j.wasman.2017.06.029. Epub 2017 Jun 28.
Food waste has a high energy potential that can be converted into useful energy in the form of methane via anaerobic digestion. Biochemical Methane Potential assays (BMPs) were conducted to quantify the impacts on methane production of different ratios of food waste. Anaerobic digester sludge (ADS) was used as the inoculum, and BMPs were performed at food waste:inoculum ratios of 0.42, 1.42, and 3.0g chemical oxygen demand/g volatile solids (VS). The 1.42 ratio had the highest CH-COD recovery: 90% of the initial total chemical oxygen demand (TCOD) was from food waste, followed by ratios 0.42 and 3.0 at 69% and 57%, respectively. Addition of food waste above 0.42 caused a lag time for CH production that increased with higher ratios, which highlighted the negative impacts of overloading with food waste. The Gompertz equation was able to represent the results well, and it gave lag times of 0, 3.6 and 30days and maximum methane productions of 370, 910, and 1950mL for ratios 0.42, 1.42 and 3.0, respectively. While ratio 3.0 endured a long lag phase and low VSS destruction, ratio 1.42 achieved satisfactory results for all performance criteria. These results provide practical guidance on food-waste-to-inoculum ratios that can lead to optimizing methanogenic yield.
食物浪费具有很高的能源潜力，可以通过厌氧消化转化为甲烷等有用能源。本研究采用生化甲烷潜能测定法（BMP）来量化不同食物垃圾比例对甲烷生成的影响。采用厌氧消化污泥（ADS）作为接种物，BMP 试验中食物垃圾与接种物的比例分别为 0.42、1.42 和 3.0g 化学需氧量/挥发性固体（VS）。结果表明，1.42 比例的 CH-COD 回收率最高：90%的初始总化学需氧量（TCOD）来自食物垃圾，其次是 0.42 比例和 3.0 比例，分别为 69%和 57%。当添加的食物垃圾比例高于 0.42 时，CH 生成会出现滞后时间，且随着比例的增加而延长，这突出了食物垃圾过度负荷的负面影响。Gompertz 方程能够很好地代表试验结果，其滞后时间分别为 0、3.6 和 30 天，最大甲烷产量分别为 370、910 和 1950mL，比例分别为 0.42、1.42 和 3.0。虽然 3.0 比例的滞后阶段较长，VSS 破坏率较低，但 1.42 比例在所有性能指标上均取得了令人满意的结果。这些结果为食物垃圾与接种物的比例提供了实际指导，有助于优化产甲烷量。
