高浓度藻液和藻垫中溶解氧及硫化氢的响应  

Response of Dense Algae and Algal Mats About Oxygen and Hydrogen Sulfide

作　　者：尹涛[1] 丁爱中[1] 孙寓姣[1] 

机构地区：[1]北京师范大学水科学研究院,北京100875

出　　处：《人民黄河》2015年第3期92-95,共4页Yellow River

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07012-002-004);国家自然科学基金资助项目(41040028);北京市委;市政府重点工作及区县政府应急预启动项目(Z10110605540000)

摘　　要：湖泊水华过程中的高浓度藻液往往在湖边形成藻垫,为研究藻液及藻垫的性质及相互关系,在不同光照条件下用微电极对两者不同深度的硫化氢及溶解氧浓度进行了监测,结果表明:在光照从0μE·m-2·s-1增强到120μE·m-2·s-1时,藻垫好氧区从-1 500μm下移至-2 700μm,增厚约1 200μm,藻液好氧区从约-12 500μm下移到-15 000μm,增厚约2 500μm;在光照从0μE·m-2·s-1增强到40μE·m-2·s-1时,藻垫底端硫化氢浓度从300μmol/L降低到56μmol/L,藻液中硫化氢浓度保持不变,约为50μmol/L。从而得出,在光强增加相同的情况下,藻液中的好氧区厚度增加较大;藻垫底端硫化氢浓度较大,光照对藻垫底部的硫化氢浓度影响较大。High concentration algal solution caused by water bloom often forms algal mats around the lake. For studying the characteristics of algal scum and algal mats as well as the interrelation between them,microelectrode was used to monitor the concentration of hydrogen sulfide and dissolved oxygen at different depths. The results are as follows： when light intensity is enhanced from 0 μE·m^- 2·s^- 1to 1 200 μE·m- 2·s^- 1,the aerobic zone of algal mats descends from- 1 500 μm to- 2 700 μm which presents a 1 200 μm thickness increase; the aerobic zone of algae scum descends from- 12 500 μm to- 15 000 μm and the thickness increment is about 2 500 μm. When light intensity is enhanced from 0 μE·m^- 2·s^- 1to 40 μE · m^- 2·s^- 1,the hydrogen sulfide concentration at the bottom of algal mats reduces from 300μmol / L to 56 μmol /L while the the hydrogen sulfide concentration is remained to be 50 μmol /L in the algal scum. A conclusion can be fairly drew from the result that when providing a same light intensity increase,the aerobic zone thickness of the algae scum increases more than that of the algae mat; the concentration of hydrogen sulfide at the bottom of the algal mats is bigger than that of the algae scum. Light condition has a greater impact on hydrogen sulfide at the bottom of the algal mats.

关 键 词：藻垫 藻液 水华 微电极 

分 类 号：X524[环境科学与工程—环境工程]