湖泊科学2019，Vol.31Issue(1)：99-112,14.DOI:10.18307/2019.0110
再生水补给河流北运河CODCr降解系数变化及影响因素
CODCr degradation coefficient of urban river recharged with reclaimed water and its impacting factors
摘要
Abstract
Chemical oxygen demand (COD) is one of the major indicators of surface water pollution in China. Degradation coefficient of pollutant may provide scientific basis for understanding the process of organic polluter change and effective pollution control. As a typical urban river recharged with reclaimed water, Beiyun River is at very serious state of COD pollution. In this research, five typical sections from upstream to downstream (Mafang Bridge, Huosha Road, Dongguan Bridge, Yulinzhuang Bridge and Yangwa Sluice) on Beiyun River were selected for estimating CODCr degradation coefficients and calibration by laboratory simulation experiments. Taking the section of Yangwa sluice as a typical example, the sedimentation rate and reoxygenation coefficient were measured on site to evaluate water self-purification ability. Then the impacts of different environmental factors (temperature, dissolved oxygen and flow rate) on CODCr degradation were discussed based on laboratory simulation experiments. The conclusions were summarized as follows: The water purifying ability of Beiyun River was very low. The sedimentation rates ranged from 1.59 to3.22 m/d, among which, the lowest rate was in Yangwa Sluice with a reoxygenation coefficient of 0. 016 d-1. The variation of CODCr degradation coefficients conformed to the first-order kinetic equation, ranging from 0.0184 d-1to 0.0883 d-1corrected by the hydraulic and temperature condition. The CODCr degradation coefficients showed significant spatial variation. The degradation coefficients of upstream sections was higher than that of downstream sections, except Yangwa Sluice (last section of Beijing at downstream) as the highest (0.0416-0.0883 d-1), showing the characteristics of the sluice. Water quality parameters such as temperature, dissolved oxygen, redox potential (ORP), nutrients, and total organic carbon (TOC) were the main influence factors. The CODCr degradation coefficients increased with the temperature, dissolved oxygen and flow rate. In addition, CODCr degradation coefficient was positively related to nutrients and TOC, but negatively to ORP. The results of this study can provide a scientific reference for urban river improvement and pollution control.关键词
再生水/CODCr降解/水体自净/降解因素/北运河Key words
Urban reclaimed water/water self-purification/degradation of CODCr/degradation factors/Beiyun River引用本文复制引用
张培培,吴艺帆,庞树江,王晓燕,杜伊..再生水补给河流北运河CODCr降解系数变化及影响因素[J].湖泊科学,2019,31(1):99-112,14.基金项目
北京市自然科学基金委员会-北京市教育委员会联合资助重点项目(KZ201810028047) （KZ201810028047）
科技创新服务能力建设-基本科研业务费(科研类)(025185305000/149) （科研类）
国家自然科学基金项目(41271495)联合资助 （41271495）
