扬水造流技术控藻机制研究  

Studies on algal control mechanism of air circulation technology

作　　者：张小璐[1] 何圣兵[1] 陈雪初[1] 杨峰峰[1] 戴鼎立[1] 孔海南[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《中国环境科学》2011年第12期2058-2064,共7页China Environmental Science

基　　金：国家水体污染控制与治理重大专项(2008ZX07106-2-2);温州市科技计划项目(S20080024)

摘　　要：围绕扬水造流技术的两个关键控藻参数Vmix(水体垂直混合速率)和Emix:Eu(混合深度与真光层深度之比),分别在实验室和现场围隔中开展模拟实验探讨藻类的时空分布.结果表明,实验开始20h后藻类垂直分布趋向动态平衡,Vmix≥1.08cm/min时2h内藻类未出现浮聚现象,Vmix≥1.35cm/min则能够长期(≥20h)遏制表面水华;根据20h平衡分布变异系数对光照和混合组合条件下的控藻效果进行了分类.藻类生消实验显示衰亡速率常数K与Emix:Eu呈正相关(R2=0.85,P<0.05,n=5),表明增大Emix:Eu在一定程度上有利于促进藻类衰亡.现场围隔实验结果表明,Emix:Eu对藻类生长消亡的显著影响,并认为在自然条件下,扬水造流技术要发挥控藻效用,Emix:Eu必须≥3:1.In order to discuss spatial and temporal distributions of blue-green algae in limnetic water with optical depth and vertical mixing, laboratory and field experiments of air circulation process were conducted, focusing on two key parameters： Emix：Eu - ratio of mixing depth and euphoric zoon depth, and Vmix - vertical mixing rate. Dynamic equilibrium of algal vertical distribution appeared beyond 20h. Within 2h, algal bloom cannot develop at water surface with Vmix〉1.08 cm/min; while the same situation could last for above 20h with Vmix〉1.35 cm/min. Coefficient of variation （CV） was introduced to depict algal vertical dispersion, and 3-order magnitude differences of CV were classified. K - the rate constant of algal decay hold positive correlation with Emix：Eu （R2=0-85）, indicating that Emix＇Eu was contributive to precipitating algal decline. Besides, field experiment showed that algal bloom disappeared as Emix：Eu〉3.

关 键 词：扬水造流 控藻 光照 混合 

分 类 号：X171.4[环境科学与工程—环境科学]