【摘要】 高盐度废水可以产生于多种途径,如沿海城市用海水冲厕产生含盐生活污水,食品加工等工业生产过程中产生含盐工业污水。这些污水经过污水处理厂处理之后,会产生大量含盐污泥,污泥中的盐度给后续污泥处理增加了难度。嗜热菌预处理技术(S-TE)可以高效破解污泥絮体和微生物细胞,将其中的有机物释放到液相中,使后续处理更为高效。本文通过测定水解过程中污泥底物的胞外聚合物(EPS)和溶解性有机物(DOM)中SCOD、蛋白质和糖的浓度变化,并利用三维荧光光谱技术(EEM)结合积分区域分析法(FRI)分析了底物EPS和DOM中有机物的成分及含量变化,探究了不同盐度(0.0%~4.0%)的污泥经S-TE预处理后的水解效果。通过测定污泥总悬浮固体(TSS)和挥发性悬浮固体(VSS)的变化,分析了污泥的减量效果。结果表明,低盐度条件(1.0%~2.0%)有利于污泥水解过程中有机物的释放;2.0%盐度条件下得到的水解液的可生化性最好;随着盐度的升高,污泥减量化效果下降。更多还原

【Abstract】 Wastewater contained highly-concentrated salt,is produced in a variety of ways,such as salinity domestic sewage produced by seawater flushing in coastal cities,and salinity industrial sewage produced in food processing and other industrial processes.The wastewater will convert to a large amount of salinity sludge after treatment in municipal sewage treatment plants,and the salinity of the sludge increases the difficulty of subsequent sludge treatment.Solubilization by thermophilic enzyme(S-TE)pretreatment could effectively accelerate the dissolve of sludge flocs and the rupture of microbes′cell membranes and walls,which could release organic matters into liquid phase for subsequent utilization.In this study,S-TE pretreatment was used to hydrolyze the sludge with varying salinity between 0%and 4.0%.Based on the conversion of the substances in extracellular polymeric substances(EPS)and dissolved organic matters(DOM)in salinity sludge,not only the changes of SCOD,protein and carbohydrate was analyzed,but also the structural and functional properties of organics in EPS and DOM was evaluated by using three-dimensional excitation-emission matrix(3 D-EEM)fluorescence spectroscopy with fluorescence regional integration(FRI)analysis.The sludge reductions were measured by the changes of total suspending solids(TSS)and volatile suspending solids(VSS).The results showed that lower salinity(1.0%~2.0%)condition is of great benefit to release the organic matter from the sludge into the liquid phase.The hydrolysis products of 2.0%salinity sludge had the highest proportion of biodegradable substance content.With increasing salinity,the sludge reduction decreased.更多还原