Comprehensive Incremental Cost-benefit Model And Application Research On Water Saving In Residential Quarters

Due to the increasingly serious shortage of water resources in our country,the domestic water consumption is gradually increasing.As the main unit of domestic water use,residential quarters,water conservation is very important for improving the efficiency of water resource utilization.At present,research on water-saving technologies for residential quarters is becoming more and more mat.However,the research on the benefits of residential quarters is limited to economic benefits,resulting in insufficient economic motivation for water-saving technologies in residential quarters.In the current benefit research,there are problems such as parameter values that deviate from the actual quarters,different calculation methods,and excessive differences.This makes it impossible to compare regional differences horizontally.In view of the above problems,this paper considers the incremental cost economic benefits,environmental benefits and social benefits of water-saving technologies in residential quarters,redefines the comprehensive benefits of water-saving technologies in residential quarters,constructs a comprehensive incremental cost-benefit model of water-saving in residential quarters,and Conditions and climatic conditions Three typical cities of Beijing,Shenzhen and Lanzhou were selected to study the regional differences in benefits,combined with the global sensitivity analysis method,the sensitivity analysis of the comprehensive benefits was carried out,and the reasons for the differences were analyzed in depth.The main research conclusions are as follows:1.Consider the incremental costs,economic incremental benefits,environmental incremental benefits,and social incremental benefits of water-saving technologies in residential quarters,sort out the causal feedback relationship between different elements and different systems,and build a residential area containing 16 benefit indicators Integrating incremental cost-benefit system dynamics model of water-saving technology,and conducting investigations in different regions,selecting Beijing,Shenzhen,and Lanzhou as typical cities,and proposing that there are differences in the parameters of economic conditions and environmental conditions in the three urban areas 17.2.Considering that the parameters can be more realistic,use EPANET2.0 software and SWMM5.1 to simulate the water supply system and rainwater system of the community,and obtain the leakage of water supply pipe network,water supply water quality(residual chlorine concentration),energy Five aspects of data including consumption,reduction of pollutants during rainfall,and runoff.Among them,the water supply system scheme 4 with the lowest leakage of the water supply network has a total annual leakage of 4631.12m3/a;the water supply system scheme 3 with the least pump energy consumption has a total annual energy consumption of 158997 kw h;Water supply system scheme 3 and scheme 4 have the highest residual chlorine concentration;rainwater system scheme 4 has the highest pollutant reduction during rainfall,followed by rainwater system scheme 3;rainwater system scheme 4 has the highest runoff reduction rate.Through the numerical simulation parameters of the actual community,three scenarios are set,and the setting angles are the optimal water quality scenario,the largest water saving scenario,the consideration of economic level and various equilibrium scenarios.3.Use the constructed benefit model to simulate the change of comprehensive incremental cost-benefit under different scenarios for different regions.The simulation results show that the optimal water-saving technology combination scenario in Beijing and Shenzhen is scenario two,and the optimal water-saving technology combination scenario in Lanzhou is scenario three.By analyzing and comparing the benefits of the optimal combination of water-saving technologies in the three regions,the present value of Beijing’s comprehensive incremental cost-benefit after 20 years is 38.8806 million yuan,which is 1.04 times that of Shenzhen(37.4784 million yuan)and 2.58 times that of Lanzhou(15.0596 million yuan).million yuan).4.The parameters that are highly sensitive to comprehensive incremental cost-benefit in Beijing are economic loss caused by water shortage in J4 unit,annual average precipitation in Q1,water price in J1,water transfer cost in J3,sewage treatment cost in J2,electricity price in J6,and electricity price in Q6.Evaporation per unit of green space,Q5,Lanzhou has zero sensitivity except for J3 and J2,and the sensitivity of parameters J4,Q1,J1,J6 is almost the same as that of Beijing.The economic losses caused by water shortage in J4 units in Shenzhen,the average annual precipitation in Q1,and the water price in J1 are all about0.2-0.3 less than those in Beijing.5.There is a gap between economic incremental benefit and environmental incremental benefit,while the difference between social incremental benefit and incremental cost is relatively small.There are 9 benefit indicators with obvious regional differences.Among them,the economic benefits caused by water shortage in H2,the benefits of flood control fees in H5,and the benefits of humidification in H9 are the highest in Shenzhen,mainly because the rainfall and rainfall characteristics limit the benefits of Beijing and Lanzhou.value,Lanzhou and Beijing have less evaporation per unit of green space during the rainfall concentration period,resulting in low humidification benefits.The remaining five indicators are the highest in Beijing,followed by Shenzhen,and the lowest in Lanzhou.Among them,Shenzhen’s less rainwater recycling and Lanzhou’s lower water use value lead to lower benefit values.