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首页> 外文会议>Air and Waste Management Association annual conference and exhibition >Long-Term Performance of the Thermophilic Anaerobic Digestion of the Organic Fraction of Municipal Solid Waste Under Induced Operational Disturbances
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Long-Term Performance of the Thermophilic Anaerobic Digestion of the Organic Fraction of Municipal Solid Waste Under Induced Operational Disturbances

机译：诱导性操作扰动下城市固体废物有机部分高温厌氧消化的长期性能

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In this study, a lab scale (14 liter) digester was operated for 837 days, during which it was subjected to three different disturbances and the corresponding recovery strategies were documented. After startup, in the absence of mixing, the loading rate was gradually increased beyond the capacity of the system leading to overloading conditions with doubled VFA concentration and substantial decrease in CH4 generation. On day 190, the feeding was interrupted for 2 weeks and resumed at a low rate. After six weeks of unsuccessful trials, continuous mixing was resumed and the digester's content was diluted and re-inoculated with a varied seeding mix of manure, waste activated sludge, municipal compost and landfill leachate. Feeding was gradually increased and stabilized at 2.4 g VS/l/d for about 4 hydraulic retention times (HRT=30days). On day 492, a hydraulic shock was induced by wasting ～25% of the digester's content, resulting in a drop in CH_4 generation rate. A recovery strategy was adopted consisting of replacing half of the wasted liquor with distilled water and adding more seeding material (compost and leachate). The daily wastage was reduced to limit biomass washout and OLR was decreased to 2 g VS/L/d. On day 641, an organic shock was induced by doubling the loading rate (OLR = 4 g VS/L/d) over one week, resulting in a drop in methane generation and a concomitant surge in VFA concentration. A recovery strategy was adopted consisting of 2 weeks of interrupted feeding, followed by 4 weeks of incremental loading to reach the initial OLR (2 g VS/L/d). Pre-shock methane generation was reestablished and stabilized at 410 L CH4/g VS during the last 3 HRT of the experiment.
机译：在本研究中，实验室规模（14升）蒸煮器运营837天，在此期间，它受到了三种不同的干扰，并记录了相应的回收策略。在启动后，在没有混合的情况下，逐渐增加加载速率超出了系统的能力，从而导致具有加倍VFA浓度的条件，并且CH4代的显着降低。在第190天，饲养被中断2周并以低速率恢复。经过六周的不成功试验后，恢复连续混合，蒸煮器的含量稀释并用各种植物，废物活性污泥，市政堆肥和垃圾填埋场渗滤液再浸入。进料逐渐增加并以2.4g vs / L / d稳定约4个液压保留时间（HRT = 30天）。在第492天，通过浪费〜25％的蒸煮器的含量诱导液压冲击，导致CH_4生成率下降。采用恢复策略，包括用蒸馏水取代浪费的一半，并添加更多播种物质（堆肥和渗滤液）。将每日浪费降低以限制生物质冲洗，并且OLR降至2g vs / L / d。在第641天，通过将装载速率加倍（OLR = 4g Vs / D）在一周内诱导有机休克，导致甲烷产生下降和VFA浓度的伴随浪涌。采用恢复策略组成2周的中断饲料，其次是4周的增量负荷，达到初始OLR（2g Vs / L / D）。在实验的最后3个HRT期间，在410L CH4 / g Vs中重新建立并稳定了休克预浸甲烷生成。

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