评估不同混合比例下协同消化污水污泥和猪粪的稳定性。
Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios.
机构信息
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
出版信息
Waste Manag. 2020 Aug 1;114:299-306. doi: 10.1016/j.wasman.2020.07.003. Epub 2020 Jul 17.
This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VS was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.
本研究评估了污水污泥（SS）和猪粪（PM）共消化的消化稳定性和总体甲烷产量。将四种不同比例的 PM 与 SS 混合，以达到不同的总固体（TS）终浓度，即 4%、6%、8%和 10%。挥发性固体（VS）减少率随着 TS%的增加而降低，在 TS 为 6%的处理中获得了最大的累积甲烷产量 342 mL/g VS。当 TS ≥ 8%时，观察到挥发性脂肪酸（VFAs）、游离氨氮（FAN）和总氨氮（TAN）的积累。在 TS 含量为 10%时，VFAs 积累到 > 20000 mg/L，最高 FAN 为 481 mg/L。甲烷生成的抑制与 FAN 和 VFA/TIC 呈负相关（P < 0.05）。通过添加 PM，共消化被证明是一种有效提高 SS 甲烷产量的方法，因为它可以富集可生物降解的有机物质，并使 C/N 比更加平衡。
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