Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt; Civil Engineering Dept., Delta University for Science and Technology, International Coastal Road, Gamasa City, Egypt.
Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt.
Sci Total Environ. 2024 Jan 10;907:168022. doi: 10.1016/j.scitotenv.2023.168022. Epub 2023 Oct 28.
Improvement of current wastewater treatment plants (WWTPs) to accommodate the growing influent flow rate and cope with the increasingly stringent regulations is hindered by the allowed space and the difficulty of changing the design parameters. Mathematical modeling is a useful tool for assessing the performance of WWTPs in light of broadening objectives. We herein explore the utilization of mathematical modeling to improve effluent quality in conventional activated sludge systems. BioWin was used to model Mansoura WWTP, one of the largest WWTPs in Egypt. Lab records, design reports, and additional analyses were conducted through site visits and a comprehensive sampling campaign. The wastewater was characterized, and the plant-wide model was calibrated following the protocol of the Dutch Foundation for Applied Water Research STOWA. Important kinetic and stoichiometric parameters were identified and adjusted during the calibration process. The model validity was assessed using different validation periods considering average relative deviation (ARD) values below 20 % as acceptable. The optimized nitrification and denitrification processes involved 16 scenarios with different operational conditions. By changing some zones in the aeration basin from aerobic to anoxic and increasing the return activated sludge, the average ammonia and nitrate concentrations were significantly reduced from 23.06 and 0.5 mg/L to 4.64 and 0.07 mg/L respectively. Furthermore, phosphorus removal optimization was carried out through biological and chemical processes. Chemical phosphorus removal was 85.76 % by using a coagulant dosage of 25 mg/L, resulting in an effluent concentration of 1.04 mg P/L. Biological phosphorus removal was increased to 85.43 % by modifying the volume of anaerobic and aerobic zones with lower power consumption. Overall, this study demonstrates the effectiveness of mathematical modeling in enhancing effluent quality and reducing energy consumption to meet stringent wastewater treatment regulations.
改进现有的废水处理厂（WWTP）以适应不断增长的进水流量，并应对日益严格的法规，这受到可用空间和改变设计参数难度的限制。数学建模是评估 WWTP 性能的有用工具，因为它拓宽了目标。本文探讨了利用数学建模来提高传统活性污泥系统的出水质量。使用 BioWin 对 Mansoura WWTP 进行建模，该 WWTP 是埃及最大的 WWTP 之一。通过现场访问和全面采样活动，进行实验室记录、设计报告和其他分析。对废水进行了特征描述，并按照荷兰应用水研究基金会 STOWA 的协议对全厂模型进行了校准。在标定过程中，确定并调整了重要的动力学和化学计量参数。使用不同的验证期评估模型有效性，认为平均相对偏差（ARD）值低于 20%是可接受的。优化的硝化和反硝化过程涉及 16 种不同操作条件的情景。通过将曝气池的一些区域从好氧变为缺氧，并增加回流活性污泥，氨和硝酸盐的平均浓度分别从 23.06 和 0.5mg/L 显著降低至 4.64 和 0.07mg/L。此外，通过生物和化学过程进行了除磷优化。通过使用 25mg/L 的凝结剂剂量，化学除磷率达到 85.76%，出水浓度为 1.04mg P/L。通过修改厌氧和好氧区的体积并降低能耗，生物除磷率提高到 85.43%。总的来说，本研究证明了数学建模在提高出水质量和降低能耗以满足严格的废水处理法规方面的有效性。
