Surface water samples were collected from selected locations along river Panchaganga,from Kolhapur to Narsobawadi during April 2019.Physicochemical parameters were determined in the laboratory and chemical mass balanc...Surface water samples were collected from selected locations along river Panchaganga,from Kolhapur to Narsobawadi during April 2019.Physicochemical parameters were determined in the laboratory and chemical mass balance approach was adopted to estimate the individual ionic loads in the river water.Streeter-Phelps equation was applied to derive a relationship between DO and BOD_(5).Model parameters such as De-oxygenation Rate(K_(d))and Re-aeration Rates(K_(r))were optimized using different empirical methods.The result of chemical mass balance showed an increase in the loading of various ions from upstream to downstream which could be attributed to agricultural and industrial wastes that enter the main stream.De-oxygenation rate and re-aeration constants were calculated using various empirical methods.DO sag curve was developed using Streeter Phelp’s model and compared with the observed parameters which showed a significant correlation.DO-BOD concentration observed along the course of the river indicated that the self-purification capacity of the river is high due to which the river regains the lost DO level at a distance less than 50 meters.展开更多
月湖是山东荣成湾内的一个正在开发水产养殖业与旅游业的小海湾,然而在人为活动干预下,月湖的环境与生态系统发生了剧烈的变化,如水质恶化、水产品产量下降等。1999 年夏季开始对月湖开展了环境化学的调查。结果表明,海水溶解氧的含量正...月湖是山东荣成湾内的一个正在开发水产养殖业与旅游业的小海湾,然而在人为活动干预下,月湖的环境与生态系统发生了剧烈的变化,如水质恶化、水产品产量下降等。1999 年夏季开始对月湖开展了环境化学的调查。结果表明,海水溶解氧的含量正常,在某些站位上溶解氧饱和度超过100% 。生化耗氧量一般小于4 m g/L。化学耗氧量则在3～4 m g/L之间。海水中氮,磷,硅含量均低于国家海水标准,表明月湖缺少陆地水供应来源。展开更多
通过对蓄水的中小型城区河段水文、水力特征以及水体物理、化学、生态等特征的分析,结合这类河段的底泥多且污染较重,底泥耗氧比例较大的特点,对传统的D obb ins—C am p水质模型作了适当的修正;并通过对河段概化,以修正后的一维稳态D o...通过对蓄水的中小型城区河段水文、水力特征以及水体物理、化学、生态等特征的分析,结合这类河段的底泥多且污染较重,底泥耗氧比例较大的特点,对传统的D obb ins—C am p水质模型作了适当的修正;并通过对河段概化,以修正后的一维稳态D obb ins—C am p水质模型为基础,建立了计入了河段内全部排污口及汇入支流的BOD—DO耦合关系矩阵水质模型;把建立的BOD—DO耦合关系矩阵水质数学模型应用于广东某城市蓄水城区河段水体的BOD和DO的模拟中,得到了良好的模拟效果。展开更多
文摘Surface water samples were collected from selected locations along river Panchaganga,from Kolhapur to Narsobawadi during April 2019.Physicochemical parameters were determined in the laboratory and chemical mass balance approach was adopted to estimate the individual ionic loads in the river water.Streeter-Phelps equation was applied to derive a relationship between DO and BOD_(5).Model parameters such as De-oxygenation Rate(K_(d))and Re-aeration Rates(K_(r))were optimized using different empirical methods.The result of chemical mass balance showed an increase in the loading of various ions from upstream to downstream which could be attributed to agricultural and industrial wastes that enter the main stream.De-oxygenation rate and re-aeration constants were calculated using various empirical methods.DO sag curve was developed using Streeter Phelp’s model and compared with the observed parameters which showed a significant correlation.DO-BOD concentration observed along the course of the river indicated that the self-purification capacity of the river is high due to which the river regains the lost DO level at a distance less than 50 meters.
文摘月湖是山东荣成湾内的一个正在开发水产养殖业与旅游业的小海湾,然而在人为活动干预下,月湖的环境与生态系统发生了剧烈的变化,如水质恶化、水产品产量下降等。1999 年夏季开始对月湖开展了环境化学的调查。结果表明,海水溶解氧的含量正常,在某些站位上溶解氧饱和度超过100% 。生化耗氧量一般小于4 m g/L。化学耗氧量则在3～4 m g/L之间。海水中氮,磷,硅含量均低于国家海水标准,表明月湖缺少陆地水供应来源。
文摘通过对蓄水的中小型城区河段水文、水力特征以及水体物理、化学、生态等特征的分析,结合这类河段的底泥多且污染较重,底泥耗氧比例较大的特点,对传统的D obb ins—C am p水质模型作了适当的修正;并通过对河段概化,以修正后的一维稳态D obb ins—C am p水质模型为基础,建立了计入了河段内全部排污口及汇入支流的BOD—DO耦合关系矩阵水质模型;把建立的BOD—DO耦合关系矩阵水质数学模型应用于广东某城市蓄水城区河段水体的BOD和DO的模拟中,得到了良好的模拟效果。
