Zhang Ruihong, El-Mashad Hamed M, Hartman Karl, Wang Fengyu, Liu Guangqing, Choate Chris, Gamble Paul
Biological and Agricultural Engineering Department, University of California, CA 95616, USA.
Bioresour Technol. 2007 Mar;98(4):929-35. doi: 10.1016/j.biortech.2006.02.039. Epub 2006 Apr 24.
Food waste collected in the City of San Francisco, California, was characterized for its potential for use as a feedstock for anaerobic digestion processes. The daily and weekly variations of food waste composition over a two-month period were measured. The anaerobic digestibility and biogas and methane yields of the food waste were evaluated using batch anaerobic digestion tests performed at 50 degrees C. The daily average moisture content (MC) and the ratio of volatile solids to total solids (VS/TS) determined from a week-long sampling were 70% and 83%, respectively, while the weekly average MC and VS/TS were 74% and 87%, respectively. The nutrient content analysis showed that the food waste contained well balanced nutrients for anaerobic microorganisms. The methane yield was determined to be 348 and 435 mL/gVS, respectively, after 10 and 28 days of digestion. The average methane content of biogas was 73%. The average VS destruction was 81% at the end of the 28-day digestion test. The results of this study indicate that the food waste is a highly desirable substrate for anaerobic digesters with regards to its high biodegradability and methane yield.
对加利福尼亚州旧金山市收集的食物垃圾进行了特性分析，以评估其作为厌氧消化过程原料的潜力。测量了两个月期间食物垃圾成分的每日和每周变化。使用在50摄氏度下进行的间歇式厌氧消化试验评估了食物垃圾的厌氧消化率以及沼气和甲烷产量。通过为期一周的采样确定的每日平均水分含量（MC）和挥发性固体与总固体的比率（VS/TS）分别为70%和83%，而每周平均MC和VS/TS分别为74%和87%。营养成分分析表明，食物垃圾含有对厌氧微生物营养均衡的养分。消化10天和28天后，甲烷产量分别确定为348和435 mL/gVS。沼气的平均甲烷含量为73%。在28天的消化试验结束时，挥发性固体的平均破坏率为81%。这项研究的结果表明，就其高生物降解性和甲烷产量而言，食物垃圾是厌氧消化器非常理想的底物。
