糠醛废水与水稻秸秆联合厌氧发酵研究

Study on anaerobic co-digestion of furfural wastewater and rice straw

为探究底物浓度与好氧水解时间对糠醛废水与水稻秸秆联合厌氧发酵的影响,设计糠醛废水与水稻秸秆混合直接厌氧发酵及糠醛废水与水稻秸秆好氧水解再厌氧发酵对比试验。发酵料液中硫酸根浓度为100mg·L^-1条件下,总固体浓度(TS)为5%、6%、7%、8%联合厌氧发酵试验,筛选最优底物浓度,在时间为3、4、5、6、8、10、12h条件下作好氧水解发酵试验。结果表明,当VS/SO42-比值为264,好氧水解时间为8h时,木质素降解率最快,糠醛废水与水稻秸秆联合厌氧发酵效果最好,峰值容积产气率达1940mL·L^-1·d^-1,较无好氧水解试验组高11.5%。TS、VS产甲烷率分别为266.90和285.52mL·g^-1,与无好氧水解试验组相比增加21.75%。为糠醛废水与水稻秸秆资源化利用提供理论参考和技术支持。

In order to explore the effect of substrate concentration and aerobic hydrolysis time on anaerobic co-digestion of furfural wastewater and rice straw, the anaerobic fermentation test of furfural wastewater and rice straw, the aerobic hydrolysis of furfural wastewater and rice straw and the anaerobic fermentation test were compared. When the concentration of sulfate in the fermentation liquid was 100 mg· L^-1, the combined anaerobic fermentation test with total solid concentration (TS) of 5%, 6%, 7% and 8% was carried out to select the optimum substrate concentration. Then aerobic hydrolysis fermentation experiments were carried out under the conditions of 3, 4, 5, 6, 8, 10 and 12 h. The results showed that when the ratio of VS/SO4^2- was 264 and the aerobic hydrolysis time was 8 h, the degradation rate of lignin was the fastest, and the anaerobic co-digestion effect of furfural wastewater and rice straw was the best.The peak volume gas production rate reached 1 940 mL· L^-1· d^-1, which was 11.5% higher than that of the test group without aerobic hydrolysis.The methane yields of TS and VS were 266.90 and 285.52 mL · g^-1, respectively, which was 21.75% higher than that of the test group without aerobic hydrolysis. This results provided theoretical reference and technical support for the resource utilization of furfural wastewater and rice straw.