The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, Thailand.
The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand.
Bioresour Technol. 2014 Dec;173:256-265. doi: 10.1016/j.biortech.2014.09.039. Epub 2014 Sep 16.
The objective of this study was to investigate the separate hydrogen and methane productions from cassava wastewater by using a two-stage upflow anaerobic sludge blanket (UASB) system under thermophilic operation. Recycle ratio of the effluent from methane bioreactor-to-feed flow rate was fixed at 1:1 and pH of hydrogen UASB unit was maintained at 5.5. At optimum COD loading rate of 90 kg/m3 d based on the feed COD load and hydrogen UASB volume, the produced gas from the hydrogen UASB unit mainly contained H2 and CO2 which provided the maximum hydrogen yield (54.22 ml H2/g COD applied) and specific hydrogen production rate (197.17 ml/g MLVSSd). At the same optimum COD loading rate, the produced gas from the methane UASB unit mainly contained CH4 and CO2 without H2 which were also consistent with the maximum methane yield (164.87 ml CH4/g COD applied) and specific methane production rate (356.31 ml CH4/g MLVSSd). The recycling operation minimized the use of NaOH for pH control in hydrogen UASB unit.
本研究旨在通过采用两段式上流式厌氧污泥床（UASB）系统在高温条件下从木薯废水中分别进行氢气和甲烷的生产。甲烷生物反应器出水的回流比固定为 1:1，氢气 UASB 单元的 pH 值保持在 5.5。在基于进料 COD 负荷和氢气 UASB 体积的最佳 COD 负荷率 90 kg/m3·d 下，氢气 UASB 单元产生的气体主要含有 H2 和 CO2，提供了最大的氢气产率（54.22 ml H2/g COD 应用）和比氢气产率（197.17 ml/g MLVSS·d）。在相同的最佳 COD 负荷率下，甲烷 UASB 单元产生的气体主要含有 CH4 和 CO2 而不含 H2，这也与最大的甲烷产率（164.87 ml CH4/g COD 应用）和比甲烷产率（356.31 ml CH4/g MLVSS·d）一致。循环操作最大限度地减少了氢气 UASB 单元中 NaOH 的用量以控制 pH 值。
