College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China.
Sci Total Environ. 2019 Jun 20;670:31-40. doi: 10.1016/j.scitotenv.2019.03.158. Epub 2019 Mar 12.
Recently, the treatment and utilization of saline waste sludge has drawn growing attention because large amounts of saline waste sludge were generated with the increase of saline wastewater discharge. In this study, thermophilic bacteria (TB) pretreatment was applied to accelerate the hydrolysis of saline waste sludge and the efficiency of hydrolysis at different salinities was evaluated. Compared with the group without salinity, the releasing of carbohydrate (up to a 67.0% decrease) in extracellular polymeric substances (EPS) was inhibited at the salinity ranging from 1.0% to 2.5%, and the releasing of protein (up to a 17.6% decrease) was inhibited under salinity conditions. Excess salinity (4.0%) caused the cell lysis, and the content of soluble chemical oxygen demand (SCOD), soluble carbohydrate and protein in dissolved organic matter (DOM) increased by 44.9%, 38.8% and 20.8% than that obtained without salinity, respectively. According to the excitation-emission matrix (EEM) fluorescence spectroscopy, the biodegradability of sludge was improved at 2.0% salinity. At 2.0% salinity, the maximum fluorescence intensity of soluble microbial byproduct substances (76,358.9 (au)) and the minimum fluorescence intensity of humic acid-like substances (173,424 (au)) were obtained. The increased salinity was beneficial for the sludge stabilization and was disadvantageous for the sludge reduction.
最近，由于盐水废水排放量的增加，大量的盐水污泥产生，盐水污泥的处理和利用引起了越来越多的关注。本研究采用嗜热菌（TB）预处理加速盐水污泥的水解，并评估了不同盐度下的水解效率。与无盐度组相比，在 1.0%至 2.5%的盐度范围内，胞外聚合物（EPS）中碳水化合物（最大减少 67.0%）的释放受到抑制，在盐度条件下，蛋白质（最大减少 17.6%）的释放受到抑制。过量的盐度（4.0%）导致细胞裂解，溶解有机物质（DOM）中可溶性化学需氧量（SCOD）、可溶性碳水化合物和蛋白质的含量分别比无盐度时增加了 44.9%、38.8%和 20.8%。根据激发-发射矩阵（EEM）荧光光谱，在 2.0%盐度下，污泥的生物降解性得到提高。在 2.0%盐度下，可生物降解微生物副产物物质的最大荧光强度（76,358.9（au））和腐殖酸类物质的最小荧光强度（173,424（au））得到。增加的盐度有利于污泥的稳定化，不利于污泥的减少。
