环境因素变化下城市黑臭水体中硫元素的释放特性  

Release Characteristics of Sulfur in Black and Odorous Water in Cities Against the Change of Environmental Factors

作　　者：段文松[1,2] 黄观超 郝敏 崔嘉吉[1] 吴安安 王文洁 李带 李婷 DUAN Wen-song;HUANG Guan-chao;HAO Min;CUI Jia-ji;WU An-an;WANG Wen-jie;LI Dai;LI Ting(School of Ecology and Environment, Anhui Normal University, Wuhu 241000, China;Soil and Water Pollution Control and Remediation Engineering Laboratory, Wuhu 241000, China)

机构地区：[1]安徽师范大学生态与环境学院,芜湖241000 [2]安徽省水土污染治理与修复工程实验室,芜湖241000

出　　处：《科学技术与工程》2020年第31期13072-13078,共7页Science Technology and Engineering

摘　　要：河道黑臭化问题在城市生态文明建设中已成为最为棘手的环境问题,硫元素作为水环境界面一类氧化还原敏感性元素,其在水环境致黑致臭方面有着特殊的贡献。在河道中硫元素的含量和形态随季节变化很大,因此外在环境因素对其影响较大。利用室内模拟实验,探究不同外在环境因素(温度、溶解氧和扰动强度)变化下,硫元素在沉积物-水界面上的迁移过程。结果表明:四种硫元素形态释放规律基本呈现先升高再趋于稳定的变化趋势,释放速率表现为:亚硫酸根离子(SO32-)>硫离子(S2-)>硫酸根离子(SO42-)>硫代硫酸根离子(S2O32-);在扰动条件下,对水体中SO32-变化较大,其在第7天达到释放峰值,浓度为42.50 mg/L;在溶解氧实验下,氧含量越高会加速硫元素之间的转化,同时也促进SO32-的转化;在温度条件下,温度更高会加快生物的活性,促进硫元素最终向SO42-的转化过程,其平衡浓度为40.00 mg/L。The river becoming black and odorous is the most difficult environmental problem in the construction of urban ecological civilization. As a kind of redox sensitive element in the interface of water environment, sulfur makes special contribution to the water environment growing black and odorous. The content and form of sulfur in river vary greatly with seasons, so the external environmental factors affect a lot. Using indoor simulation experiments, the migration process of sulfur element on sediment water interface under different external environmental factors(temperature, dissolved oxygen and disturbance intensity) was studied. The results show that the release trend of the four sulfur elements is basically rising first and then becoming stable. The release rate of the four sulfur elements is as follows: sulfite ion(SO32-)>sulfide(S2-)>sulfate ion(SO42-)>thiosulfate ion(S2O32-). Under the condition of disturbance, SO32- in water changes greatly, reaching the peak value of release on the 7 th day, with a concentration of 42.50 mg/L. In the dissolved oxygen experiment, the higher the oxygen content accelerates the transformation among the sulfur elements, and also promotes the transformation of SO32-. In the temperature condition, the higher the temperature accelerates the biological activity, promotes the transformation process of the sulfur elements to SO42-, and its equilibrium concentration is 40.00 mg/L.

关 键 词：黑臭水体 沉积物-水界面 硫元素 室内模拟实验 环境因素 

分 类 号：X192[环境科学与工程—环境科学]