Hydrogen Production by Anaerobic Fermentation From Wastewater in Poultry Farms
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摘要: 在养殖场鸡粪废水中添加米糠提高废水的碳氮比,以经过不同预处理的厌氧活性污泥为接种物,控制发酵温度为36℃,初始pH为5.0,考察污泥预处理及底物质量浓度对发酵产氢的影响,并分析液相末端产物及发酵液化学需氧量(chemical oxygen demand,COD)去除率.研究结果表明,污泥的最佳预处理方法为热处理(100℃下加热15 min),发酵累积生物气产量和氢气产量分别为1 781和1 082.8 mL,是未处理组的2.52和5.85倍;鸡粪废水的适宜质量浓度为10 218 mg/L,此时氢气产量为185.1 mL/g,由Gompertz模型对产气量进行非线性拟合得拟合方程,说明该模型可很好地模拟发酵产氢过程;发酵结束后液相末端产物主要转化为乙酸和丁酸等挥发性有机酸,在不同底物质量浓度下COD去除率随底物质量浓度先增加后减小,在质量浓度为10 218 mg/L时达到26.9%.Abstract: Methods of sludge pretreatment and substrate mass concentration influencing fermentation of poultry dung wastewater are investigated in this research.The anaerobic conditions are as follows: temperature is 36 ℃,pH is 5.0,and rice bran fluid is added to increase w(C)/w(N) of wastewater.Meanwhile,terminal product of liquid phase and removal rate of COD of fermentation liquor are also analyzed.Results show that the best method of sludge pretreatment is heat treatment(at 100 ℃ for 15 minutes);the production of cumulative biogas and hydrogen are 1 781 mL and 1 082.8 mL,2.52 and 5.85 times untreated group,respectively.The optimum mass concentration of poultry dung wastewater is 10 218 mg/L with hydrogen yield as 185.1 mL/g.At the end of fermentation,the products of liquid phase are organic acids such as acetic acid and butyric acid.The removal of COD varies with substrate concentration,which reaches 26.9% at the mass concentration of 10 218 mg/L.
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