从食物垃圾中生产挥发性脂肪酸：pH 值、温度和有机负荷率的影响。
Volatile fatty acids production from food waste: effects of pH, temperature, and organic loading rate.
机构信息
School of Environment, Tsinghua University, Beijing 100084, China.
出版信息
Bioresour Technol. 2013 Sep;143:525-30. doi: 10.1016/j.biortech.2013.06.025. Epub 2013 Jun 17.
The effects of pH, temperature, and organic loading rate (OLR) on the acidogenesis of food waste have been determined. The present study investigated their effects on soluble chemical oxygen demand (SCOD), volatile fatty acids (VFAs), volatile solids (VS), and ammonia nitrogen (NH4(+)-N). Both the concentration and yield of VFAs were highest at pH 6.0, acetate and butyrate accounted for 77% of total VFAs. VFAs concentration and the VFA/SCOD ratio were highest, and VS levels were lowest, at 45 °C, but the differences compared to the values at 35 °C were slight. The concentrations of VFAs, SCOD, and NH4(+)-N increased as OLR increased, whereas the yield of VFAs decreased from 0.504 at 5 g/Ld to 0.306 at 16 g/Ld. Acetate and butyrate accounted for 60% of total VFAs. The percentage of acetate and valerate increased as OLR increased, whereas a high OLR produced a lower percentage of propionate and butyrate.
本研究确定了 pH 值、温度和有机负荷率（OLR）对食物垃圾产酸的影响。研究考察了它们对可溶性化学需氧量（SCOD）、挥发性脂肪酸（VFAs）、挥发性固体（VS）和氨氮（NH4(+)-N）的影响。在 pH 值为 6.0 时，VFAs 的浓度和产率最高，乙酸和丁酸占总 VFAs 的 77%。在 45°C 时，VFAs 浓度和 VFA/SCOD 比值最高，VS 水平最低，但与 35°C 时的值相比差异很小。随着 OLR 的增加，VFAs、SCOD 和 NH4(+)-N 的浓度增加，而 VFAs 的产率从 5 g/Ld 时的 0.504 下降到 16 g/Ld 时的 0.306。乙酸和丁酸占总 VFAs 的 60%。随着 OLR 的增加，乙酸和戊酸的比例增加，而高 OLR 会降低丙酸和丁酸的比例。
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