Journal of Water and Wastewater; Ab va Fazilab (in persian)

Journal of Water and Wastewater; Ab va Fazilab (in persian)

Optimum Design of Placement and Hydraulic Dimensions of Domestic Wastewater Collection Network with the Approach of Removing the Highest Amount of COD and Increasing DO Along the Route

Document Type : Research Paper

Authors
Massoud Tabesh 1
Omid Pouraskari Dehnavi 2
Reza Heydarzadeh 3
1 Prof., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 MSc., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
3 PhD., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran and Head of the Technical Office, Khorasan Razavi Province Water and Wastewater Company, Mashhad, Iran
10.22093/wwj.2025.503059.3477
Abstract
Today, the design and implementation of wastewater collection, disposal and treatment networks is considered as one of the vital factors in preserving and protecting the environment and ensuring the public health of people in cities and villages. By reviewing past studies as well as the lack of optimized layout design, qualitative analysis of the sewerage network along with the design of the dimensions of the sewerage network becomes obvious. In this research, a method for the simultaneous design of layout and dimensions of the domestic sewage network has been used; with an optimal design, in addition to satisfying the required hydraulic conditions, can improve the quality of incoming wastewater treatment via COD and DO modeling. For this purpose, using the Loop-by-Loop cutting algorithm to generate network layout, the algorithm to determine the hydraulic dimensions of the sewer network, and the WATS model for qualitative modeling of wastewater in the network, employing the gray wolf algorithm for optimization, the desired network is established. To evaluate the presented method, a sample wastewater collection network was investigated. Based on the results obtained, the cost of scenarios 2 and 3 increased by 9 and 14 percent, respectively, compared to scenario 1, which is mainly due to the increase in the slope of the pipes and, as a result, the increase in the depth of the pipes. The COD objective function in scenarios 2 and 3 improved by 164 and 132 percent, respectively. For example, in scenario 2, a 4.5 percent decrease in the COD value was observed along the studied network. The DO objective function is also zero in all three scenarios due to the depletion of DO along the wastewater transport path. However, in each scenario, the DO values in the pipes show a higher value than the previous scenario, which makes it necessary for that scenario to have less aeration than the previous one.
Keywords
Optimal Design
Sewage Collection Network
Gray Wolf Algorithm
Qualitative Analysis
COD
DO

Subjects

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Journal of Water and Wastewater; Ab va Fazilab (in persian)
Volume 36, Issue 2 - Serial Number 157
July and August 2026
Pages 1-22