Pollution characteristics and control strategies of runoff in Tianjin Binhai Lingang industrial park
WU Minshan1,2,, LI Simin1, ZHANG Wenqiang2,,, SHAN Baoqing2, GU Xiujun3 1.College of Energy and Environment Engineering, Hebei University of Engineering, Handan 056038, China 2.State Key Laboratory of Environmental Water Quality, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Tianjin Lingang Construction and Development Co. Ltd., Tianjin 300461, China
Abstract:Controlling non-point source pollution in industrial parks is the key to solve the increasingly prominent water environment problems in Tianjin Binhai New Area and to maintain the water ecological security in the surrounding sea areas. In order to alleviate the increasingly prominent contradiction between the deterioration of ecological environment and sustainable economic development in the region, five typical rainfall runoffs during the flood season of Lingang Industrial Park Phase 1 construction in Tianjin Binhai New Area were taken as the research object in this study. The average concentrations of multiple rainfall events (EMCs) were used to analyze the pollution levels of Ammonia Nitrogen (NH3-N), Total Nitrogen (TN), Soluble Reactive Phosphorus (SRP), Total Phosphorus (TP), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and six soluble heavy metals Cu, Pb, Zn, Cr, Cd, Ni in the runoff pollution of different underlying surfaces in the industrial park. The results showed that COD, NH3-N and TN in runoff pollution in Tianjin Lingang Industrial Park were more prominent in roof runoff rainwater, and the contents of COD (EMCs=170.68 mg·L?1), ammonia nitrogen (EMCs=14.49 mg·L?1) and TN (EMCs=29.66 mg·L?1) were 1.4, 3.33 and 1.64 times of those in surface runoff rainwater, respectively. The contents of SRP (EMCs=1.87 mg·L?1) and TSS (EMCs=163.18 mg·L?1) in surface runoff rainwater were 2.26 and 2.87 times of those in roof runoff rainwater, respectively, and the TP content (EMCs=1.43 mg·L?1) was equivalent between roof runoff rainwater and surface runoff rainwater. The pollution degree of six toxic heavy metals was relatively light, which was equivalent to the main urban area of Tianjin. The prominent contents of Cr, Zn and Cu still had potential ecological and environmental risks in runoff pollution in Lingang Industrial Park. Based on the M(V) curve of the relationship between runoff pollution output load and runoff, the pollutant transport process of runoff on different underlying surfaces was quantitatively analyzed through the pollutant first scour ratio (MFFRn) and scour intensity coefficient b. The results showed that, in general, the first 20% of accumulated runoff was more prone to the first scouring effect (MFFR20 is 10% higher than MFFR30) than the first 30% of accumulated runoff, and the probability of the first scouring phenomenon (b<1.025) was about 75%. Rainfall intensity and the accumulated pollution load on the underlying surface had a great impact on the pollution transport curve of the secondary rainfall runoff. Combined with the analysis of pollutant sources, source control, process cleaning and initial rainwater interception will be effective strategies to alleviate runoff pollution in the current industrial park. Key words:stormwater runoff/ industrial parks/ first flush/ source apportionment.
图1天津滨海新区临港工业园区1期建设产业园土地利用类型及采样点位示意图 Figure1.Schematic diagram of land use types and sampling locations of Lingang industrial park phase 1 of Tianjin Binhai new area
图2天津市滨海新区塘沽站月平均降雨量(1981—2010年)分布特征及采样时间示意图 Figure2.Distribution characteristics of monthly rainfall (from 1981 to 2010) and sampling time distribution of Tanggu Station, Binhai New District, Tianjin
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1.College of Energy and Environment Engineering, Hebei University of Engineering, Handan 056038, China 2.State Key Laboratory of Environmental Water Quality, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Tianjin Lingang Construction and Development Co. Ltd., Tianjin 300461, China Received Date: 2020-01-20 Accepted Date: 2020-04-09 Available Online: 2020-12-08 Keywords:stormwater runoff/ industrial parks/ first flush/ source apportionment Abstract:Controlling non-point source pollution in industrial parks is the key to solve the increasingly prominent water environment problems in Tianjin Binhai New Area and to maintain the water ecological security in the surrounding sea areas. In order to alleviate the increasingly prominent contradiction between the deterioration of ecological environment and sustainable economic development in the region, five typical rainfall runoffs during the flood season of Lingang Industrial Park Phase 1 construction in Tianjin Binhai New Area were taken as the research object in this study. The average concentrations of multiple rainfall events (EMCs) were used to analyze the pollution levels of Ammonia Nitrogen (NH3-N), Total Nitrogen (TN), Soluble Reactive Phosphorus (SRP), Total Phosphorus (TP), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and six soluble heavy metals Cu, Pb, Zn, Cr, Cd, Ni in the runoff pollution of different underlying surfaces in the industrial park. The results showed that COD, NH3-N and TN in runoff pollution in Tianjin Lingang Industrial Park were more prominent in roof runoff rainwater, and the contents of COD (EMCs=170.68 mg·L?1), ammonia nitrogen (EMCs=14.49 mg·L?1) and TN (EMCs=29.66 mg·L?1) were 1.4, 3.33 and 1.64 times of those in surface runoff rainwater, respectively. The contents of SRP (EMCs=1.87 mg·L?1) and TSS (EMCs=163.18 mg·L?1) in surface runoff rainwater were 2.26 and 2.87 times of those in roof runoff rainwater, respectively, and the TP content (EMCs=1.43 mg·L?1) was equivalent between roof runoff rainwater and surface runoff rainwater. The pollution degree of six toxic heavy metals was relatively light, which was equivalent to the main urban area of Tianjin. The prominent contents of Cr, Zn and Cu still had potential ecological and environmental risks in runoff pollution in Lingang Industrial Park. Based on the M(V) curve of the relationship between runoff pollution output load and runoff, the pollutant transport process of runoff on different underlying surfaces was quantitatively analyzed through the pollutant first scour ratio (MFFRn) and scour intensity coefficient b. The results showed that, in general, the first 20% of accumulated runoff was more prone to the first scouring effect (MFFR20 is 10% higher than MFFR30) than the first 30% of accumulated runoff, and the probability of the first scouring phenomenon (b<1.025) was about 75%. Rainfall intensity and the accumulated pollution load on the underlying surface had a great impact on the pollution transport curve of the secondary rainfall runoff. Combined with the analysis of pollutant sources, source control, process cleaning and initial rainwater interception will be effective strategies to alleviate runoff pollution in the current industrial park.