钙对厌氧上流污泥床系统中发酵产氢的影响。

Calcium effect on fermentative hydrogen production in an anaerobic up-flow sludge blanket system.

作者信息

Chang F Y, Lin C Y

机构信息

BioHydrogen Laboratory, Department of Hydraulic Engineering, Feng Chia University, P.O. Box 25-123, Taichung 40724, Chinese, Taiwan.

出版信息

Water Sci Technol. 2006;54(9):105-12. doi: 10.2166/wst.2006.867.

DOI:10.2166/wst.2006.867

PMID:17163048

Abstract

The effects of calcium ions on a granular fermentative hydrogen production system were investigated in four lab-scale UASB reactors that fed on sucrose (20 g COD/L). The reactors were seeded with anaerobic sewage sludge microflora and operated at a temperature of 35 +/- 1 degrees, pH of 6.7 with hydraulic retention times (HRTs) of 24-6h. The experimental results indicated that calcium ion addition (75 - 150 mg/L) could enhance the granulation and elevate hydrogen production efficiency. However, an overly-high calcium concentration (300 mg-Ca(+2)/L) deteriorated the hydrogen productivity. A calcium concentration of 150 mg-Ca(+2)/L resulted in a peak HP of 3.6 mol H2/mol-sucrose and HPR of 807 mmol-H2/L-d at HRTs of 8 and 6 h, respectively. The EPS concentration of biohydrogenic biomass was higher than that of the aerobic or methanogenic biomass. The protein/carbon-ratio ranged from 0.17 to 0.26%. The multinomial regression analysis shows that the 75 - 150 mg-Ca(+2)/L calcium concentrations and HRT of 6 h were the optimal operating conditions to efficiently produce hydrogen.

摘要

在四个以蔗糖（20 g COD/L）为进料的实验室规模上流式厌氧污泥床（UASB）反应器中，研究了钙离子对颗粒发酵制氢系统的影响。这些反应器接种了厌氧污水污泥微生物群落，并在35±1℃的温度、6.7的pH值以及24 - 6小时的水力停留时间（HRT）下运行。实验结果表明，添加钙离子（75 - 150 mg/L）可以促进颗粒化并提高产氢效率。然而，过高的钙浓度（300 mg-Ca(+2)/L）会降低产氢率。在8小时和6小时的水力停留时间下，150 mg-Ca(+2)/L的钙浓度分别导致产氢峰值为3.6 mol H2/mol-蔗糖，产氢率为807 mmol-H2/L-d。产氢生物质的胞外聚合物（EPS）浓度高于好氧或产甲烷生物质。蛋白质/碳比范围为0.17%至0.26%。多元回归分析表明，75 - 150 mg-Ca(+2)/L的钙浓度和6小时的水力停留时间是高效产氢的最佳操作条件。