Study On The Mechanism Of Return Of Investment Of Sewage Treatment Public Private Partnership Projects

The public-private partnership(public-private partnership),which is the cooperation of government and social capital,is a widely used project operation model in Public infrastructure.In this mode,usually the social capital takes the responsibility to design,construct,operate and maintain.In addition,the social capital gets reasonable return through the "user pays" and the necessary "government pays".The related government departments are responsible for the price and quality of the infrastructure,in order to maximize public interest.Partners really do the best to work on the goal of "long-term cooperation,risk sharing,benefits sharing",but on the specific project investment,the consideration of the two sides are not the same,each side have their own interests.So in practice,the negotiations between the government and the social capital are often failed.The investment mode and the reasonable return on investment are what the social capital truly cares,so,the exploration of return on investment of the PPP project mode is the important precondition for project smooth landing.This paper mainly discusses the return on investment of sewage cleaning PPP project.And the whole paper is written by the following sequence:first,introduce the basic theory of PPP projects,sewage cleaning,including the related concept of the PPP mode and risk sharing;secondly analyses the common investment return models of the PPP project,especially on sewage cleaning return models is government payment,and then,focus on the main factors which influence the choose of sewage cleaning PPP projects models,like risk sharing,cooperation period,return on investment,etc.Finally,take JM project for example,the author uses the analysis methods which mentioned in the previous chapters,deeply analyzes the investment return model.And what's more,from the perspective of data analysis to predict the minimum requirements and even the refusing point of using water.The innovation of this paper is about putting forward a set of operable index system on the choice of investment return model of PPP project in sewage cleaning area,which makes the quantitative analysis and qualitative analysis possible.The deficiency of this paper is the limited quantity of samples,which may influent the result.