摘要
研究了70～120℃,20min热水解预处理对剩余污泥有机物溶出、重金属释放及厌氧消化的影响.试验结果表明,化学需氧量、碳水化合物、蛋白质、DNA及氨氮(NH4—N)等指标的溶出在110℃以下都随着温度增加而增加,且在90～100℃之间有显著跳跃性增长,在120℃反而有所下降.污泥中微生物细胞在100℃时破裂.通过研究挥发性固体(VS)去除率和沼气产率来表征低温热水解对厌氧消化的影响,这2项指标均在110℃取得最大值.在上述研究基础上进行了相关性分析及回归分析,结果表明,所有的有机物溶出指标及厌氧消化性能均与预处理温度有显著的相关性,而单位降解VS产气与碳水化合物及蛋白质的溶出率呈很好的多元线性关系.
An investigation was made into the effect of thermal pretreatment at the temperature between 70-120℃ for 20 min on sludge organic matter solubilization, heavy metal release and anaerobic digestion. Flocs as well as cells were broken down and the organic matter was released to liquid phase. Solubilisation of properties such as chemical oxygen demand, carbohydrate, protein, deoxyribonucleic acid and ammonia all increased with temperature below 110℃ and experienced a significant jump at the temperature between 90℃ and 100℃. However, solubilisation of major organic compounds decreased at 120℃. Cells of microorganism were broken down at 100℃. The concentrations of heavy metals in the soluble phase increase with temperature. But no remarkable increase was observed for heavy metal release. Volatile solid removal and biogas production were investigated to evaluate the effect of thermal pretreatment on efficiency of anaerobic digestion. Both the two indexes reached their peak at 110℃. Correlation and regression analysis were made based on the research. The results show that there are remarkable correlation between pretreatment temperature, solublisation of the organic matter and behavior of anaerobic digestion. Then the influence of soluble protein and soluble carbohydrates on biogas production per VS is illustrated by the stepwise linear regression equations.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期716-721,共6页
Journal of Tongji University:Natural Science
基金
国家水体污染控制与治理科技重大专项(2011ZX07316-004)
国家自然科学基金(51278358)
关键词
低温热水解
溶出
剩余污泥
厌氧消化
low temperature thermal pretreatment
solubilisation
waste activated sludge
anaerobic digestion
