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首页> 外文期刊>Environmental Monitoring and Assessment >Calibration and verification of a dissolved oxygen management model for a highly polluted river with extreme flow variations in Pakistan
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Calibration and verification of a dissolved oxygen management model for a highly polluted river with extreme flow variations in Pakistan

机译：巴基斯坦极端流量变化严重污染的河流中溶解氧管理模型的校准和验证

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摘要

A dissolved oxygen (DO) model is calibrated and verified for a highly polluted River Ravi with large flow variations. The model calibration is done under medium flow conditions (431.5 m~3/s), whereas the model verification is done using the data collected during low flow conditions (52.6 m3/s). Biokinetic rate coefficients for carbonaceous biochemical oxygen demand (CBOD) and nitrogenous biochemical oxygen demand (NBOD) (i.e, KCI and Kn) are determined through the measured CBOD and ammonia river profiles. The calculated values of KCT and Kn are 0.36 day~-1 and 0.34 day~-1, respectively. The close agreement between the DO model results and the field values shows that the verified model can be used to develop DO management strategies for the River Ravi. The biokinetic coefficients are known to vary with degree of treatment (DOT) and therefore need to be adjusted for a rational water quality management model. The effect of this variation on level of treatment has been evaluated by using the verified model to attain a DO standard of 4 mg/L in the river using the biokinetic rate coefficients as determined during the model calibration and verification process. The required DOT in this case is found to be 96 %, whereas the DOT is 86 % if adjusted biokinetic rate coefficients are used to reflect the effect of wastewater treatment. The cost of wastewater treatment is known to increase exponentially as the removal efficiency increases; therefore, the use of appropriate biokinetic coefficients to manage the water quality in rivers is important.
机译：校准并验证了高流量变化很大的高污染河拉维的溶解氧（DO）模型。模型校准是在中等流量条件下（431.5 m〜3 / s）完成的，而模型验证是使用低流量条件下（52.6 m3 / s）收集的数据进行的。碳质生化需氧量（CBOD）和含氮生化需氧量（NBOD）（即KCI和Kn）的生物动力学速率系数是通过测量的CBOD和氨水剖面来确定的。 KCT和Kn的计算值分别为0.36 day〜-1和0.34 day〜-1。 DO模型结果与现场值之间的密切一致性表明，经过验证的模型可用于开发拉维河的DO管理策略。已知生物动力学系数随处理程度（DOT）的变化而变化，因此需要针对合理的水质管理模型进行调整。通过在模型校准和验证过程中确定的生物动力学速率系数，使用已验证的模型评估河流中DO的标准为4 mg / L，评估了这种变化对处理水平的影响。在这种情况下，所需的DOT为96％，而如果使用调整后的生物动力学速率系数来反映废水处理的效果，则DOT为86％。众所周知，废水处理成本随着去除效率的提高而成倍增加。因此，使用适当的生物动力学系数来管理河流水质很重要。

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