Liu Nuo, Jiang Jianguo, Yan Feng, Xu Yiwen, Yang Meng, Gao Yuchen, Aihemaiti Aikelaimu, Zou Quan
School of Environment, Tsinghua University Beijing 100084 China
Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China Beijing 100084 China.
RSC Adv. 2018 Mar 14;8(19):10457-10464. doi: 10.1039/c7ra13268a. eCollection 2018 Mar 13.
Anaerobic digestion of food waste (FW) is commonly considered an effective and green technology to convert solid waste into valuable feedstock including volatile fatty acids (VFAs) and hydrogen. Response surface methodology (RSM) was selected to analyze the production of VFAs and hydrogen from food waste in a batch process. The effect of the three variables total solid content (TS), pH, and reaction time under each variable at three levels on VFAs and hydrogen production was assessed. The optimum conditions determined RSM were pH = 7.0, TS = 100 g L, and reaction time = 3 d. The maximum VFA and hydrogen production was 26.17 g L and 46.03 mL g volatile solids added, respectively. The ratio of observed hydrogen (H) to predicted hydrogen (H) was < 1.0 because of inhibition of hydrogen production by VFA accumulation. The subsequent microbial community analysis result was also consistent with the abovementioned results. The evolution of Bacteroidetes, which facilitate VFA production, has been enriched by about 16.1-times at pH 7.0 followed by 10.2-times at pH 6.0 as compared to that in the uncontrolled pH batch.
食物垃圾（FW）的厌氧消化通常被认为是一种将固体废物转化为包括挥发性脂肪酸（VFAs）和氢气在内的有价值原料的有效且绿色的技术。选择响应面法（RSM）来分析分批过程中食物垃圾产生挥发性脂肪酸和氢气的情况。评估了总固体含量（TS）、pH值和反应时间这三个变量在三个水平下各自对挥发性脂肪酸和氢气产生的影响。通过响应面法确定的最佳条件为pH = 7.0、TS = 100 g/L以及反应时间 = 3天。挥发性脂肪酸和氢气的最大产量分别为26.17 g/L和46.03 mL/g添加的挥发性固体。由于挥发性脂肪酸积累对氢气产生的抑制作用，观察到的氢气（H）与预测的氢气（H）之比<1.0。随后的微生物群落分析结果也与上述结果一致。与未控制pH值的批次相比，促进挥发性脂肪酸产生的拟杆菌属的进化在pH 7.0时富集了约16.1倍，在pH 6.
