Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan.
Bioresour Technol. 2011 May;102(9):5394-9. doi: 10.1016/j.biortech.2010.10.069. Epub 2010 Oct 20.
This study evaluates a two-stage bioprocess for recovering bioenergy in the forms of hydrogen and methane while treating organic residues of ethanol fermentation from tapioca starch. A maximum hydrogen production rate of 0.77 mmol H(2)/g VSS/h can be achieved at volumetric loading rate (VLR) of 56 kg COD/m(3)/day. Batch results indicate that controlling conditions at S(0)/X(0)=12 with X(0)=4000 mg VSS/L and pH 5.5-6 are important for efficient hydrogen production from fermentation residues. Hydrogen-producing bacteria enriched in the hydrogen bioreactor are likely utilizing lactate and acetate for biohydrogen production from ethanol-fermentation residues. Organic residues remained in the effluent of hydrogen bioreactor can be effectively converted to methane with a rate of 0.37 mmol CH(4)/g VSS/h at VLR of 8 kg COD/m(3)/day. Approximately 90% of COD in ethanol-fermentation residues can be removed and among that 2% and 85.1% of COD can be recovered in the forms of hydrogen and methane, respectively.
本研究评估了一种两阶段生物工艺，用于回收生物能源，形式为氢气和甲烷，同时处理木薯淀粉乙醇发酵的有机残余物。在体积负荷率（VLR）为 56kg COD/m³/天时，最大氢气产率可达 0.77mmol H₂/g VSS/h。分批结果表明，控制 S(0)/X(0)=12 条件，X(0)=4000mg VSS/L，pH 值为 5.5-6，对于从发酵残余物中高效生产氢气非常重要。在氢生物反应器中富集的产氢细菌可能利用乳酸盐和醋酸盐从乙醇发酵残余物中生产生物氢气。在 VLR 为 8kg COD/m³/天时，氢生物反应器出水中剩余的有机残余物可有效转化为甲烷，产甲烷速率为 0.37mmol CH₄/g VSS/h。乙醇发酵残余物中约 90%的 COD 可被去除，其中 2%和 85.1%的 COD 分别以氢气和甲烷的形式回收。
