摘要
通过批次实验研究温度对餐厨垃圾自由厌氧发酵(不控制pH)性能的影响。考察了室温(25℃),中温(35℃)和高温(55℃)条件下发酵基质的降解程度和有机酸的产量以及组成情况。结果表明,尽管高温条件下颗粒态有机物有最快的水解速率,但室温条件下有机酸浓度却达到了最大值(8.85 g COD·L^(-1));乳酸和乙酸是自由发酵过程中最主要的有机酸,室温下乳酸和乙酸的含量分别为总有机酸的72.86%和25.11%,而中温和高温时乳酸和乙酸的含量比值均在43.6%~50%之间。实验表明,自由发酵条件下,最佳的水解酸化温度是25℃。
We conducted batch experiments to determine the effect of temperature on the digestion performance during short-term free anaerobic fermentation( without pH adjustment) of food waste. We analyzed organic-acid products and the degree of degradation of the fermentation substrate at room temperature( 25 ℃),mesophilic temperature( 35 ℃),and thermophilic temperature( 55 ℃). The results revealed that the fastest rate of degradation of organics corresponded to 55°C,but the most abundant total organic-acid products( 8. 85 g COD·L^-1)are obtained at 25 ℃. Lactic and acetic acids were the most prevalent organic-acids produced during the experiments,and their proportions in total acid content at 25 ℃ were 72. 86% and 25. 11%,respectively,but they showed close levels( between 43. 6% and 50%) at 35 and 55 ℃. All results showed that 25 ℃ is the most suitable temperature for hydrolysis and acidogenesis in a free digestion process.
作者
张永梅
王晓昌
程喆
ZHANG Yongmei WANG Xiaochang CHENG Zhe(School of Environmental Municipal Engineering, Xi' an University of Architecture and Technology, Xi' an 710055, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第2期1087-1092,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(50838005)
关键词
温度
餐厨垃圾
自由厌氧发酵
有机酸
temperature
food waste
free anaerobic fermentation
organic acid