Dynamic simulation and cost-effectiveness analysis method for assisting scale design of CSO regulation and storage tank

Abstract

A dynamic simulation and cost-effectiveness analysis method for assisting the scale design of a CSO regulation and storage pond comprises the following steps: 1, establishing a dynamic simulation model of a combined system regulation and storage pond based on an urban water system simulation model; 2, determining hydrological attributes of a combined system catchment area within the service range of the regulation and storage tank; 3, determining meteorological data; 4, determining the dry season sewage amount and the interception multiple; 5, determining simulation parameters and rainfall session division parameters; 6, determining design parameters of the regulation and storage tank; 7, calculating the overflow quantity and the overflow frequency of the system under a certain regulation and storage tank scale, and recording the overflow quantity and the overflow frequency in a table; 8, repeating the step 6 to obtain the overflow quantity and the overflow frequency of the system under different storage tank scales; and 9, calculating the overflow reduction rate under different storage pond scales. Based on the urban water system simulation model, dynamic simulation is carried out on the combined system drainage system of different regulation and storage pool scales, the cost-benefit curve is obtained, the regulation and storage pool scale is reasonably determined, and the control effect of the regulation and storage pool is quantitatively evaluated.

Description

technical field [0001] The invention belongs to the technical field of scale calculation of a confluence storage tank, in particular to a dynamic simulation and cost-benefit analysis method for assisting the scale design of a CSO storage tank. Background technique [0002] At present, many cities in my country still adopt combined drainage system to discharge urban domestic sewage and rainwater into a unified pipeline network, and transport the mixed wastewater to the treatment device at the end of the pipeline or sewage plant for centralized disposal. However, due to the limitation of economic cost, the design of combined pipe network is often unable to bear the high discharge caused by rainfall events. Most of the rainwater generated by rainfall enters the pipes and mixes with sewage, and the overflow sewage generated by exceeding the carrying capacity of the pipes Direct discharge into the receiving water body causes river pollution, which is called combined system overfl...

AI Technical Summary

Problems solved by technology

[0004] The current storage tank design mostly adopts the empirical formula method or mathematical model simulation calculation method. The empirical formula method has certain advantages, such as simple operation and does not require a large amount of data, but it has the following defects: 1. Natural conditions in different regions, The characteristics of rainfall and the conditions of the underlying surface are different. It is difficult to obtain a relatively accurate optimal plan by using empirical values. In the absence of actual conditions to modify the values ​​​​of empirical formula parameters, the design values ​​of storage tanks are conservative. It leads to a waste of more engineering investment; 2. In the case of a certain volume of the storage tank, the relationship between the rainfall, the overflow of the combined system, and the pollution of the overflow of the combined system is not clear, and the control effect of the storage tank cannot be quantitatively described and reflected

The mathematical model simulation calculation method is to establish the hydrological and hydraulic model of the combined system, and use the field or continuous rainfall to simulate CSO to determine the scale of regulation and storage that meets the design goals. However, the model method usually requires a large amount of basic data, which makes many projects unable to meet the conditions.

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