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引用本文: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.湖泊科学,2019,31(1):99-112. DOI:
ZHANG Peipei,WU Yifan,PANG Shujiang,WANG Xiaoyan,DU Yi.CODCr degradation coefficient of urban river recharged with reclaimed water and its impacting factors. J. Lake Sci.2019,31(1):99-112. DOI:
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再生水补给河流北运河CODCr降解系数变化及影响因素
张培培1, 吴艺帆1, 庞树江1, 王晓燕1,2, 杜伊1
1.首都师范大学资源环境与旅游学院, 北京 100048;2.首都师范大学首都圈水环境研究中心, 北京 100048
摘要:
化学需氧量(COD)是影响地表水体水质的主要污染指标.明确地表水中COD的降解系数,可为把握有机物污染过程变化以及有效控制污染提供科学依据.北运河是城市再生水河流,COD污染严重.以北运河从上游至下游的5个典型断面(马坊桥、火沙路、东关大桥、榆林庄桥、杨洼闸)为例,通过室内模拟实验,估算了不同断面CODCr降解系数,并对CODCr降解系数进行校正;测定了颗粒物沉降速率、复氧系数,评估了水体自净能力;分析了不同环境条件(温度、溶解氧、流速)对CODCr的降解影响.结论如下:北运河水体自净能力较差,颗粒物沉降速率范围为1.09~3.22 m/d,杨洼闸断面颗粒物沉降速率最低为1.09 m/d,其复氧系数偏低,为0.016 d-1.北运河水体CODCr降解系数符合一级动力学方程;经水力、温度经验公式校正后,CODCr降解系数范围为0.0184~0.0883 d-1,低于我国其他平原地区河流.北运河CODCr降解系数存在明显的空间差异性,上游断面的降解系数高于下游断面,不过下游北京界最后出水断面杨洼闸表现出闸坝特殊性,降解系数最高(0.0416~0.0883 d-1).水质参数中温度、溶解氧、氧化还原电位、营养盐以及总有机碳是CODCr降解系数的主要影响因子.CODCr降解系数随着温度、溶解氧、外源动力增加而增大;CODCr降解系数与营养盐、TOC呈显著正相关,与氧化还原电位呈显著负相关.研究结果可为我国相关城市再生水体水质改善和城市黑臭水体治理提供科学依据.
关键词:  再生水  CODCr降解  水体自净  降解因素  北运河
DOI:
分类号:
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)、科技创新服务能力建设-基本科研业务费(科研类)(025185305000/149)和国家自然科学基金项目(41271495)联合资助.
CODCr degradation coefficient of urban river recharged with reclaimed water and its impacting factors
ZHANG Peipei1, WU Yifan1, PANG Shujiang1, WANG Xiaoyan1,2, DU Yi1
1.College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, P. R. China;2.Research Center of Aquatic Environment in the Capital Region, Capital Normal University, Beijing 100048, P. R. China
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 to 3.22 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-1 to 0.0883 d-1 corrected 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.
Key words:  Urban reclaimed water  water self-purification  degradation of CODCr  degradation factors  Beiyun River
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