Study Of Return Mechanism Design Of Sewage Treatment PPP Projects

With the improvement of environmental treatment requirements,China has increased the construction of sewage treatment facilities.Important progress has been made in the construction of sewage treatment facilities in urban areas,and township sewage treatment facilities have gradually become the focus of construction in the field of sewage treatment.The sewage treatment field is a key application area of the PPP model.The introduction of professional social capital construction and operation of sewage treatment projects can improve project efficiency.Using PPP model to operate a wastewater treatment project,designing a reasonable return mechanism can protect the rights of both the government and social capital.In the design of a wastewater treatment project’s return mechanism,how to determine the billing method scientifically and effectively Facing one of the difficulties.At present,there are two types of billing methods: "pay by usage" and "cost and benefit".However,in the operation of different sewage treatment PPP projects,there is no clear method of selecting a billing method,and the above two methods cannot be very different.Effectively match project characteristics.The research on the selection method of billing methods in this article can provide a reference for the selection of project billing methods,and play a guiding role in the subsequent government and social capital decision-making to ensure mutual benefit and benefit both sides for government and enterprises.This paper selects five types of billing methods applicable to sewage treatment PPP projects,analyzes the characteristics of the five billing methods,and summarizes the types of sewage treatment projects applicable to each billing method.At the same time,for sewage treatment projects,five main factors affecting the choice of billing methods were selected.When a single influencing factor acts,the analytic hierarchy process is used to analyze the priority of each billing method selection under the change of the influencing factor,and then determine the priority coefficient of each billing method in the design of the PPP project return mechanism.The priority degree of the fee method under the change of a single influencing factor.The priority order of the charging method under the effect of a single influencing factor is obtained by comparing the priority coefficients.By establishing a project financial model,a sensitivity analysis is performed on the net present value of the wastewater treatment project when various influencing factors change,and the impact weight coefficients of each influencing factor on the choice of billing method are determined based on the results of the sensitivity analysis.Under the combined effect of multiple influencing factors,by establishing a utility function model,the priority factor of the charging method under the influence of a single factor and the weight coefficient of each influencing factor are comprehensively considered to obtain the utility value corresponding to each charging method.By comparing the utility values Determine the best charging method,and provide a reference for the design of the return mechanism of PPP projects in the field of sewage treatment.Finally,the NH sewage treatment PPP project is taken as an example to combine the analysis method mentioned in the paper determines the optimal charge method corresponding to the project through empirical analysis,and analyzes the applicability of the charge method in the project.