在处理食物垃圾的混合固态厌氧消化系统中，不同水分条件对微生物群落和产酸中间产物的响应。
Responses of microbial community and acidogenic intermediates to different water regimes in a hybrid solid anaerobic digestion system treating food waste.
机构信息
Department of Environmental & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, PR China; Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, PR China.
Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, PR China.
出版信息
Bioresour Technol. 2014 Sep;168:49-58. doi: 10.1016/j.biortech.2014.04.090. Epub 2014 May 9.
This study investigated the effects of different water regimes in an acidogenic leach bed reactor (LBR) during 16-day batch mode food waste digestion. LBRs were operated under five water replacement ratios (WRRs) (100%, 75%, 50%, 25% and 5% in LBRs R1, R2, R3, R4 and R5, respectively) and methanogenic effluent (ME) addition with two leachate recirculation frequencies (once in 24 h and 12 h in LBRs R6 and R7, respectively). Results showed that 50-100% WRRs accelerated the hydrolysis and acidogenesis with butyrate as the dominant product (∼35% of COD); whereas 5-25% WRRs promoted propionate production. The ME recirculation enhanced protein decomposition and reduced ethanol production. Lactobacillus dominated in LBRs with water addition (R1-R5), while Clostridium and hetero-fermenting lactic acid bacteria dominated in LBR with ME addition (R7). The highest volatile solid degradation (82.9%) and methane yield (0.29 L-CH4/g VS) were obtained with ME addition at 0.7 d hydraulic retention time.
本研究考察了在产酸渗滤床反应器（LBR）中不同水力停留时间条件下，16 天批次式餐厨垃圾消化过程中的影响。LBR 分别以 5 种水置换率（WRR）（R1、R2、R3、R4 和 R5 中分别为 100%、75%、50%、25%和 5%）和添加产甲烷液（ME）运行，两种渗滤液回流频率（LBR R6 和 R7 中分别为 24 h 和 12 h）。结果表明，50-100%的 WRR 加速了水解和产酸过程，丁酸为主要产物（∼35%的 COD）；而 5-25%的 WRR 促进了丙酸的生成。ME 回流促进了蛋白质的分解，减少了乙醇的生成。在有外加水的 LBR（R1-R5）中，乳杆菌占优势，而在有 ME 外加的 LBR（R7）中，产酸梭菌和异型发酵乳杆菌占优势。在水力停留时间为 0.7d 时，添加 ME 可获得最高的挥发性固体降解率（82.9%）和甲烷产率（0.29L-CH4/gVS）。
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