pH对生物质同步水解产酸的影响  

Effects of pH on litter hydrolysis and short-chain fatty acids accumulation

作　　者：陈一[1] 周君薇[1] 闻岳[1] 周琪[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境污染与防治》2011年第6期11-14,18,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.50808135);国家水体污染控制与治理科技重大专项(No.2009ZX07318-002);上海市国际科技合作项目"崇明村镇生活污水节能型生物生态联合处理技术与示范"(No.2008DFA91000)

摘　　要：采用香蒲枯叶作为发酵基质,考察了水生生物质在培养温度为(25.0±0.5)℃、pH为6～12下的水解产酸情况。结果表明:(1)实验末期(30 d),不同pH下香蒲枯叶中半纤维素降解率为28%～60%,比纤维素(19%～42%)和木质素(1%～46%)高。(2)在同一发酵时间内,发酵液总有机碳(TOC)、还原糖浓度总体随pH的增大而增大。(3)在pH为11、12下,疏水物质含量显著增加,推测是由于强碱条件有利于腐殖酸和蛋白质的溶出。(4)发酵时间为25 d时,在pH为12下短链脂肪酸(SCFAs)最大(1 166 mg/L)。A laboratory experiment was carried out using cattail leaves as substrate to explore the effect of pH on the fermentation and short-chain fatty acids（SCFAs） accumulation of aquatic biomass under room temperature（（25.0±0.5） ℃）.The research showed that SCFAs achieved the maximum accumulation of 1 049 mg/L under the condition of pH 12 and fermentation for 25 d.Alkaline conditions could enhance lignin and semi-cellulose decomposition,with the highest decomposition rate reached up to 46% and 60% respectively.The decomposition rate of cellulose was in the range of 19%-42%,and alkalescence condition was favorable to cellulose decomposition.The releasing of TOC and reducing sugar indicated that alkaline condition promoted the hydrolysis of cattail leaves efficiently,the hydrophobic material was also significantly increased under the alkaline condition,presumably because alkaline conditions was benefit for dissolution of protein and humic substances.

关 键 词：纤维素 半纤维素 木质素 短链脂肪酸 还原糖 发酵 亲疏水性 

分 类 号：TQ352[化学工程]