Department of Engineering, Aarhus University, Hangøvej 2, DK-8200 Aarhus N., Denmark.
Waste Manag. 2018 Feb;72:186-192. doi: 10.1016/j.wasman.2017.11.021. Epub 2017 Nov 22.
This paper analyses time (30 and 60 min) and temperature (120-190 °C) effects of intermediate thermal hydrolysis (ITHP) in a two-step anaerobic digestion of waste activated sludge (WAS) with and without wheat straw as a co-substrate. Effects were analyzed by measuring biochemical methane potential for 60 days and assessing associated kinetic and chemical data. Compared to non-treatment, ITHP increased the secondary step methane yield from 52 to 222 L CH kg VS and from 147 to 224 L CH kg VS for pre-digested WAS and pre-co-digested WAS respectively at an optimum of 170 °C and 30 min. The hydrolysis coefficients (k) increased by up to 127% following treatment. Increasing ITHP time from 30 to 60 min showed ambiguous results regarding methane yields, whilst temperature had a clear and proportional effect on the concentrations of acetic acid. The energy balances were found to be poor and dewatering to increase total solids above the values tested here is necessary for this process to be energetically feasible.
本文分析了两步厌氧消化中中间热水解（ITHP）在没有和有小麦秸秆作为共底物的情况下对废活性污泥（WAS）的时间（30 和 60 分钟）和温度（120-190°C）的影响。通过测量 60 天的生物化学甲烷潜力并评估相关的动力学和化学数据来分析影响。与未经处理相比，ITHP 将预消化的 WAS 和预共消化的 WAS 的二次步骤甲烷产率分别从 52 增加到 222 L CH kg VS 和从 147 增加到 224 L CH kg VS，最佳温度为 170°C 和 30 分钟。处理后水解系数（k）增加了高达 127%。增加 ITHP 时间从 30 分钟增加到 60 分钟对甲烷产量的影响并不明显，而温度对乙酸浓度的影响则很明显。发现能量平衡很差，为使该过程在能量上可行，需要将脱水至总固体浓度高于此处测试的值。
