人工沉床去除富营养化河水中COD的过程机制

人工沉床去除富营养化河水中COD的过程机制 Process of Removing COD from Hyper-Eutrophic River Water by Constructed Submerged Plant Bed 李金中 LI Jinzhong1 1 2 first-author 李学菊 LI Xueju2 2 刘学功 LIU Xuegong2 2 黄岁樑 HUANG Suiliang1 1 南开大学环境科学与工程学院 南开大学环境科学与工程学院 College of Environmental Science and Engineering,Nankai University College of Environmental Science and Engineering,Nankai University 天津市水利科学研究院 天津市水利科学研究院 Tianjin Institution of Water Sciences Tianjin Institution of Water Sciences 设计了一种模块化气浮调节式人工沉床装置,用于去除富营养化河水中的COD.该装置克服了水深变化大、水体透明度低、夏季藻类和浮萍泛滥等不利因素对水生植物生长的制约,可显著提高重富营养化水体中植物栽植的成活率.通过在天津市外环河的现场实验表明:在植物生长期内,当停留时间为5.48 d时人工沉床对COD的去除率可达到30% 3 5%,冬季也维持在5% 1 0%.COD值随停留时间的变化符合一级动力学方程,相关系数在0.9以上;衰减系数随水温的变化趋势符合S型增长曲线:在5 2 0℃范围内,水温的上升导致COD的衰减系数快速增加,在低于5℃或高于20℃时,水温的变化对COD的衰减系数影响不明显. A kind of modularized and air adjustable constructed submerged plant bed was used to remove the chemical oxygen demand（COD） from eutrophic river water.This bed helps hydrophytes to grow up under poor conditions,such as frequently changed water depth,blurred water transparency,algae bloom and duckweed rampant in summer,which is not suitable for the natural growing of water plants.The experiments in Waihuan River of Tianjin show that removal of COD reaches 30%-35% in growing season and 5%-10% in winter when the detention time is 5.48 days.The variation of the concentration of COD with the detention time follows the first-order kinetic equation,and the correlation coefficients（R2） is above 0.9.The attenuation coefficients k of the kinetic equation varies with the water temperature according with S logistic curve.When the temperature is between 5 ℃ and 20 ℃,an increase of water temperature leads to a rapid increase of k value,but when the water temperature is lower than 5 ℃ or high than 20 ℃,the value of k is not changed significantly with the temperature of water. 人工沉床 水质净化 水生植物 COD去除率 constructed submerged plant bed water purification hydrophyte removal of COD 10.14188/j.1671-8836.2011.04.004 X52 天津市重大科技攻关项目（043115111-3）;水利部公益性行业科研专项经费项目（200801100） 2011-04-01 2021-04-01 4 57