稀盐酸预处理沼气发酵原料水葫芦的优化条件研究
Studies on the optimal pretreatment conditions of anaerobic fermentation materials of water hyacinth with dilute hydrochloric acid
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摘要: 以采自昆明滇池的新鲜水葫芦为材料,以酸降解液中所含还原糖和挥发性脂肪酸的含量为指标,研究温度、酸质量分数、固液比和处理时间对稀盐酸降解新鲜水葫芦有机质的影响.结果表明,各因素对还原糖含量的影响顺序为:温度酸质量分数固液比处理时间；对挥发性脂肪酸含量的影响顺序为:酸质量分数固液比处理时间温度.同时确定了稀盐酸预处理水葫芦的最佳条件为:酸质量分数7%,处理温度60 ℃,固液比1 g:3 mL,处理时间1.5 h,在此条件下还原糖和挥发性脂肪酸转化率达到4.4%和29.0%,与未处理样相比分别提高了628%和491%.可见,以此方式可提高水葫芦的生物利用率.Abstract: The influence of temperature,acid concentration,solid-liquid ratio and process-time on degrading organic matter of fresh water hyacinth from the Dianchi-Lake in Kunming was studied with content of reducing sugar and volatile fatty acid in acid degradation liquid as indexs.Experimental results show that the influence of various factors on the reducing sugar content in order as:temperatureacid concentrationsolid-liquid ratioprocess-time;and the influence of them on content of volatile fatty acids in order as:acid concentration solid-liquid ratiotimetemperature processing.At the same time,the condition of 60 ℃,7%,1 g:3 mL,1.5 h was selected as optimum to pretreat water hyacinth.Conversion ratios of reducing sugar and VFAs were 4.4% and 29.0% in this condition,and increased by 628% and 491% respectively compared with the untreated sample.Therefore,it is feasible to increase bioavailability of water hyacinth by this method.
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