含固率对生物浸取河道底泥深度脱水的影响  

Influence of Solid Content on Deep Dehydration of River Sediments Bioleaching

作　　者：华天钰 石明岩[1] 吴佳玲 简国丹 石云峰 朱月琪 HUA Tianyu;SHI Mingyan;WU Jialing;JIAN Guodan;SHI Yunfeng;ZHU Yueqi(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Guangzhou Jinlongfeng Environmental Protection Equipment Engineering Co.Ltd,Guangzhou 510670,China)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广州市金龙峰环保设备工程有限公司,广东广州510670

出　　处：《环境科学与技术》2019年第8期28-33,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目(51308136);国家留学基金委青年骨干教师出国研修项目(CSC201709945022);广东省研究生教育创新计划项目

摘　　要：酸化氧化反应是生物浸取底泥脱水的重要途径,底泥含固率通过影响生物浸取中的酸化氧化反应进而影响到底泥脱水效果。为此,该研究通过对含固率在3%~9%范围内的河道底泥进行生物浸取处理实验。投加2 g/L S0、5 g/L FeS2、10%微生物接种物,在起始pH值为5、曝气量强度为0.6 L/min的条件下,通过摇瓶试验,分析含固率为3%~9%的底泥对生物浸取河道底泥脱水的影响。结果表明,浸取后的河道底泥CST由13.8~24.2 s最低降至9.3~13.9 s。其中,含固率5%、浸取36 h时,CST由18.3 s降至10.3 s,获得43.7%的最大降幅。结合态EPS(特别是TB-EPS)减少、ζ电位升高是改善河道底泥脱水性能的关键因素。不同含固率的处理,病原微生物灭活率均超过98%,含固率对灭菌不产生明显影响。从技术与经济角度考虑,含固率为5%时较为适合河道底泥深度脱水。Bio-acidification and oxidation are the important methods for the dehydration of the river sediment bioleaching,and initial sediment solid contents have an important influence on the bio-acidification and oxidation during the process of sediment bioleaching, which affects the effect of dewatering performance of the sediment in the end. Therefore, in this study, the bioleaching treatments were assessed for the river sediments with solid content ranging from 3% to 9%. By shaking flask experiments, the influence of sediment with solid content of 3%~9% on the dewatering of bioleaching river sediment was analyzed under the condition of addition of 2 g/L S0, 5 g/L FeS2 and initial pH value of 5 and aeration at 0.6 L/min. The result showed that the CST of river sediments had decreased from 13.8~24.2 s to 9.3~13.9 s after bioleaching. Among them, the CST decreased from 18.3 s to 10.3 s and later it achieved the largest reduction of 43.7% when the solid content was 5% and the bioleaching was36 h. It could be concluded that the reduction of bounded EPS(especially TB-EPS) and the increase of zeta potential were the critical factors to improve the dewaterability of river sediments. In addition, the variation in the solid content conditions had no effect on the elimination efficiencies of pathogenic microorganism which were constantly>98%. From the perspective of technical and economy, it would be more suitable for deep dewatering of river sediments when the solid content was 5%.

关 键 词：含固率 河道底泥 生物浸取 脱水 病原微生物 

分 类 号：X705[环境科学与工程—环境工程]