Al-Musawi Tariq J, Mohammed Ibrahim A, Atiea Huda M
Isra University, Faculty of Engineering, Department of Civil Engineering, Amman, Jordan.
University of Kufa, College of Engineering, Department of Civil Engineering, Najaf, Iraq.
MethodsX. 2017 Oct 31;4:445-456. doi: 10.1016/j.mex.2017.10.009. eCollection 2017.
The present study aims to manage and determine the most economical efficiency of five wastewater treatment plants discharging wastewater into the Tigris River in Iraq. The management system was based on ensuring the five-day biological oxygen demand concentration in the river is <30 mg/L according to the Iraqi standards. In many cases, the determined optimized efficiencies were found to be lower than the present working efficiencies. Although this was good for the environment, it was not cost-effective. This study revealed that the variation of river flow rates was not an important factor that effects on the results obtained. It was found that the variation of organic decomposition value in the river and the minimum efficiency limit of the first upstream plant greatly affected the operating efficiency of the downstream plants. Furthermore, no constant rank was recorded for the effects of the natural decomposition on the operating efficiency of each plant. Three points were highlighted from this study: •The optimization methods were used to determine the most economical efficiency of multi wastewater treatment plants.•The effects of the BOD decomposition value, the river flow, and the minimum efficiency limit were also investigated.•This study presents the linear modeling method in detail and has a scientific impact for similar studies.
本研究旨在管理并确定伊拉克境内向底格里斯河排放废水的五座污水处理厂的最经济效率。管理系统的依据是，按照伊拉克标准，确保河流中的五日生化需氧量浓度低于30毫克/升。在许多情况下，所确定的优化效率低于当前的运行效率。虽然这对环境有益，但不具有成本效益。本研究表明，河水流速的变化并非影响所得结果的重要因素。研究发现，河流中有机分解值的变化以及上游第一座工厂的最低效率限值对下游工厂的运行效率有很大影响。此外，自然分解对各工厂运行效率的影响没有记录到固定的排序。本研究突出了三点：•使用优化方法来确定多个污水处理厂的最经济效率。•还研究了生化需氧量分解值、河水流速和最低效率限值的影响。•本研究详细介绍了线性建模方法，对类似研究具有科学影响。
