Water Quality-oriented Water Resources Model and Water Quality Economics Frame

Abstract

By analyzing the conflict between the theoretical model and the actual applications of traditional water resource evaluation,this article elaborates the process and essential elements of self-recovery and artificial recovery of water quality within the City-River basin Systems.This article proposes a water resource model of water quality recovery and water exchange and further defines the marginal conditions and applicable scope.In doing so,the comparison between urban wastewater reuse and recycle has been made,where water reuse has been defined at a river-basin level and can be expressed as increasing water volume,while wastewater recycling refers to reducing water demand.This article proposes an innovative model-Water Quality-Oriented Water Resources Model-for evaluating water resources,which takes into account the renewable nature of water quality and water recycling.Based on the Water Quality-Oriented Water Resource Model,this article brings out the idea of Water Quality Economics which modifies and expands the idea of the existed Water Resources Economics.Furthermore,water service pricing under Water Quality Economics is discussed.Moreover,the development strategy of reclaimed water is re-considered and a new conception of water scarcity grading is raised based on the sum of purification cost and artificial recovery cost for water body.