Study on the quantification method of water pollution ecological compensation standard based on emergy theory

Water pollution compensation is one of the important economic means of water pollution control and management, and the quantification of compensation standard is the key link in the implementation of water pollution ecological compensation. Because the ecological compensation refers to ecological environment, society and economy at the same time, the emergy analysis method of ecological economics was introduced to the quantification study of water pollution ecological compensation standard to overcome the shortcomings of traditional methods, and the ecological economic value of pollutants dilution water is defined as water pollution ecological compensation standard In the process, the key pollutants in river was confirmed by water quality assessment, then the water dilution model was built and the dilution water amount when pollutant concentration meeting the standards of water quality section was determined on the basis of purification of key pollutants. Using the Qingyi River as an example, the water pollution compensation standard of the key pollutants (NH3-N and COD) were calculated, which showed that the comprehensive compensation standard of NH3-N are all higher than COD in six control section. Among them, the highest comprehensive compensation standard is 93.99 yuan/t in Heshang Bridge (Changge City), the next one is 74.07 yuan/t in Hutuo sluice, and Zengfumiao Village is without compensation. Therefore, the pollutant discharge levels are different in different section, and then their compensation standards are different. To sum up, the economic, social and ecological losses caused by water pollution were considered synthetically and the emergy method for the accurate quantification of water pollution ecological compensation standard was provided.