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Effect of Substrate to Inoculum Ratio on Bioenergy Recoveryfrom Food Waste, Yard Waste, and Biosolids by HighSolids Anaerobic Digestion

机译:底物与接种物比例对高固体厌氧消化从食物垃圾,庭院垃圾和生物固体中回收生物能的影响

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Residual biosolids from wastewater treatment facilities and the organic fraction of municipal solid waste (OFMSW), such as food and yard wastes (FW and YW), are difficult to manage due to increased waste generation and recent stringent regulations. This study investigated the effect of substrate to inoculum ratio (S/I) on biochemical transformation mechanisms and biomethane production during high solids anaerobic digestion of FW, YW, and biosolids. Biochemical methane potential (BMP) assays were set up under mesophilic conditions at S/I of 1.0, 2.0, and 3.0 g OFMSW total solids (TS)/g inoculum TS. BMP with the lowest S/I (1.0) produced the highest cumulative CH4 yield of 126 mL CH4/(g VSadded), with 90% of its maximum yield by day 37, and a hydrolysis rate constant (Khyd) of (0.06 day−1). S/Is 2.0 and 3.0 resulted in higher volatile fatty acid release than S/I 1.0. This led to pH-induced inhibition of methanogenesis, longer lag phases (S/I 2.0 = 12 days and S/I 3.0 = 26 days)], and lower cumulative CH4 yields [S/I = 2.0 at 45.6-mL CH4/(g VSadded); S/I = 3.0 at 6.75-mL CH4/(g VSadded). The results show that accumulation of inhibitory intermediates can cause system failure due to mass transfer limitation under low moisture conditions when S/I > 1.0 based on TS. Results from this work assist in developing best solid waste management practices for OFMSW and resource recovery.
机译:由于废物产生量的增加和最近的严格规定,难以处理废水处理设施中残留的生物固体和城市固体废物(OFMSW)的有机成分,例如食物和庭院废物(FW和YW)。这项研究调查了FW,YW和生物固体的高固体厌氧消化过程中底物与接种物比例(S / I)对生化转化机制和生物甲烷产生的影响。在中温条件下,将S / I为1.0、2.0和3.0µg OFMSW总固体(TS)/ g接种物TS建立生化甲烷潜力(BMP)分析。最低S / I(1.0)的BMP产生的最高累积CH4产率为126 mL CH4 /(g VS加成),到第37天时其最大产率为90%,水解速率常数(Khyd)为(0.06天- 1)。 S / Is 2.0和3.0导致的挥发性脂肪酸释放量高于S / I 1.0。这导致pH诱导的甲烷生成抑制,更长的滞后阶段(S / I 2.0 = 12天和S / I 3.0 = 26天)],以及较低的累积CH4产量[在45.6-mL CH4 /(S / I = 2.0) g VSadded);在6.75mL CH 4 /(添加的g VS)下,S / I / = 3.0。结果表明,当基于TS的S / I> 1.0时,由于低水分条件下的传质限制,抑制性中间体的积累会导致系统故障。这项工作的结果有助于为OFMSW和资源回收开发最佳的固体废物管理实践。

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