密云水库东西库区的水质与浮游藻类分析

湖泊生态工程因其净化效果好、投资小、运行简单等优点,近十多年来在我国受到了广泛关注,并得到了越来越多的应用.本文介绍了云南洱海污染治理的工程技术之一--桃溪河口净化工程的设计思路.该工程基于暴雨径流输送污染物的特征,将水力工程、土石工程与生物工程有效结合,通过在桃溪河口建立溢流堰,将桃溪正常来水导截入由桃溪河口9个废弃鱼塘改造而成的净化池进行净化.工程运行的水质监测表明,该工程已发挥一定的净化效果,对TN的去除率达55.2%-86.9%,其中对NO3-N和NH4 -N的去除率都较高,对P的去除率达76.4%-88.2%,对悬浮物的去除率达29.4%-49.5%.

Analysis on the phytoplankton and water quality in eastern and western Miyun Reservoir

Ecotechnology or ecological engineering is booming as a new water treatment technology in our country in recent decade for its advantages of high purification effects,low investment and easy operation.This article presen- ted river mouth ecotechnology for purification of River Taoxi in Lake Erhai Basin.Through constructing a flooding weir at river mouth,River Taoxi water was intercepted into a purification system which was reconstructed by 9 a- bandoned fish ponds with total area of 55000~2 at left-side of river mouth.This purification system consists of 5 parts: 1)inflowing system consisting of constructed flooding weir and diversion wall;2)sand sedimentation system recon- structed by 4 ponds with an area of 27280 m~2;3)biological purification system reconstructed by 5 ponds with an ar- ea of 27720 m~2 which is designed to plant different life style aquatic plant;4)water flow distributing system which is responsible for long and uniformly water path and 5)outflowing system which is discontinuous gaps for water flow- ing out to Lake Erhai.The system has a design flow of 6.25 m~3/s.It exerts purification effects for non-point pollu- tion of River Taoxi mainly through sand sedimentation and plant purification.Water quality monitoring data in the operation period revealed that the system exert purification effects with TN removal rate of 55.2%-86.9%,TP re- moval rate of 76.4%-88.2%,SS removal rate of 29.4%-49.5%.