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首页> 外文会议>Water Environment Federation annual technical exhibition and conference;WEFTEC 2003 >SINGLE AND TWO-STAGE ANAEROBIC DIGESTION:HYDROLYSIS, ACIDIFICATION AND PATHOGEN INACTIVATION
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SINGLE AND TWO-STAGE ANAEROBIC DIGESTION:HYDROLYSIS, ACIDIFICATION AND PATHOGEN INACTIVATION

机译：单级和二级厌氧消化：水解，酸化和致病性失活

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The primary objective of this experiment was to assess the impact of different retention times in a thermophilic reactor on hydrolysis and acidification of sludge. The secondary goal of this study was to provide a comparison between various anaerobic digestion processes and their effect on the stabilization of sludge and pathogen reduction. Three lab scale anaerobic digestion systems were assembled. The main system – two-phase anaerobic digestion (TPAD) – consisted of two reactors: a thermophilic reactor followed by a mesophilic reactor. Two other systems included single phase thermophilic digester (TAD) and single phase mesophilic digester (MAD). Hydrolysis and acidification rates in the first reactor of the TPAD were the highest at 1 d solids residence time (SRT) and the lowest at 5 d SRT. It was found that the two processes increased exponentially with the decrease of SRT. Hydrolysis was a faster occurring reaction than acidification. Therefore, at short retention times acidification could be the limiting step in the first stage reactor of the TPAD. Acidification index, AI, was used as an optimization parameter for the retention time in the first reactor in TPAD. No significant difference in VS destruction between digestion systems was observed. Increase in loading rates resulted in higher methane production but it also resulted in less methane produced per gram VS destroyed. The overall efficiency of the TPAD was offset by very low methane production in the first reactor and no significant difference in the overall methane production between digestion systems was observed. The single thermophilic reactor and the TPAD system achieved Class A biosolids standards with respect to fecal coliforms and spiked Ascaris suum eggs inactivation. The single MAD often failed to produce Class B biosolids using fecal coliforms as an indicator organism. It also showed very low level of destruction of Ascaris eggs. Clostridium perfringens destruction was very low for all systems: 1-log reduction was not achieved. Apparent regrowth of these organisms was observed in mesophilic conditions. There were no overt benefits of higher hydrolysis rates in the first reactor of the TPAD system in terms of higher VS destruction and/or higher methane production when compared to the single digesters. The two-stage anaerobic digestion system was the least sensitive to changes in loading rates and retention times and exhibited the least variability in capillary suction time (CST).
机译：该实验的主要目的是评估在嗜热反应器中不同保留时间对污泥水解和酸化的影响。这项研究的次要目标是提供各种厌氧消化过程及其对污泥稳定和病原体减少的影响之间的比较。组装了三个实验室规模的厌氧消化系统。主要系统-两相厌氧消化（TPAD）-由两个反应器组成：嗜热反应器和中温反应器。其他两个系统包括单相嗜热消化器（TAD）和单相嗜温消化器（MAD）。 TPAD第一反应器中的水解和酸化速率在1 d固体停留时间（SRT）时最高，在5 d SRT时最低。发现随着SRT的降低，这两个过程呈指数增长。水解是比酸化更快发生的反应。因此，在较短的保留时间内，酸化可能是TPAD第一步反应器中的限制步骤。酸化指数AI用作TPAD中第一个反应器中保留时间的优化参数。消化系统之间的VS破坏没有显着差异。装载速率的增加导致甲烷产量增加，但每克VS破坏产生的甲烷量也减少。 TPAD的总效率被第一个反应器中甲烷的极低产量所抵消，并且在消化系统之间未观察到甲烷总产量的显着差异。单个嗜热反应器和TPAD系统在粪便大肠菌群和加标的A虫卵灭活方面均达到了A类生物固体标准。单一的MAD经常无法利用粪便大肠菌群作为指示生物来产生B类生物固体。它也显示出A虫卵的破坏水平非常低。对于所有系统，产气荚膜梭状芽胞杆菌的破坏非常低：未实现1-log降低。在中温条件下观察到这些生物的明显再生长。与单个蒸煮器相比，在更高的VS破坏力和/或更高的甲烷产量方面，在TPAD系统的第一个反应器中没有更高水解速率的明显优势。两阶段厌氧消化系统对加载速率和保留时间的变化最不敏感，并且在毛细管抽吸时间（CST）方面的变化最小。

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