摘要
利用预加热污泥(15℃~30℃)方式进行了柠檬酸脱水污泥冬季生物干化的效果及机理研究.结果表明,脱水污泥预热至20℃时可使生物干化高温期维持5.5d且最高温度可达57℃,干化14d污泥含水率从70%下降至34.80%,同时结合水含量降低了65.58%,远高于其他预热组的44.39%~49.53%的结合水去除率.能量平衡分析结果表明,污泥预热至25℃的生物产热量最高,但预热至20℃时用于水分蒸发的能量利用率最高,占总消耗热量的82.62%.此外,污泥胞外聚合物的蛋白质和多糖分析显示,LB-EPS和TB-EPS中蛋白质与多糖的比值和污泥结合水含量呈正相关,高温期Slime-EPS LB-EPS、EP-EPS层蛋白质含量显著降低,说明蛋白质降解是柠檬酸脱水污泥生物干化的主要产热与脱水机理.
The effects and mechanism of dewatered sludge bio-drying from citric acid production were studied by preheating sludge ranged from 15℃to 30℃in winter.Water content of preheating sludge to 20℃decreased from initial 70%to the final 34.80%after 14d period of bio-drying.The highest temperature reached 57℃and the period of high temperature remained 5.5d.Compared to the removal rates of bound water between 44.39%and 49.35%in other preheating groups,the group of preheating to 20℃had much higher rate with 65.58%.It was indicated from the analysis of energy balance that the group of preheating to 25℃had the maximum bio-energy while 82.62%of total energy was consumed on the water evaporation for the group of preheating to 20℃with the highest energy utilization efficiency.Through the analysis of protein and polysaccharide in sludge extracellular polymer,the ratios of protein and polysaccharide in LB-EPS and TB-EPS had significant positive correlations with sludge bound water.And the contents of protein in Slime-EPS、LB-EPS、EP-EPS reduced significantly.It suggested that the decomposition of protein should be the main mechanism of heat generating and sludge dewatering for the citric acid dewatered sludge bio-drying.
作者
张晨
李杨杨
董黎明
王金伟
刘岩峰
于湛秋
ZHANG Chen;LI Yang-yang;DONG Li-ming;WANG Jin-wei;LIU Yan-feng;YU Zhan-qiu(Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China;Weifang Ensign Industry Co.,Ltd, Weifang 261000, China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第7期2928-2937,共10页
China Environmental Science
基金
水体污染控制与治理国家科技重大专项(2017ZX07301004)
关键词
柠檬酸
脱水污泥
生物干化
结合水
蛋白质
多糖
能量平衡
citric acid
dewatered sludge
bio-drying
bound water
protein
polysaccharide
energy balance
