Resources Science ›› 2017, Vol. 39 ›› Issue (3): 451-460.doi: 10.18402/resci.2017.03.07

• Orginal Article • Previous Articles     Next Articles

Emissions reduction efficiency of sewage treatment services in county areas in China based on DEA-Tobit Modeling

Xin LI(), Xiaoxia SUN, Shipeng SU()   

  1. Institute of Sustainable Development,Fujian Agriculture and Forestry University,Fuzhou 350002,China
  • Received:2016-10-10 Revised:2017-01-13 Online:2017-03-20 Published:2017-03-20

Abstract:

County sewage treatment services have become an important emissions reduction tool;there is however,a wide disparity in emissions reduction efficiency across county areas. In an effort to examine emissions reduction efficiency across county areas,we used data envelopment analysis to calculate efficiency levels in 413 counties using data from the year 2014. Capital,operating costs,labor and energy consumption were chosen as input indices. The actual treatment of sewage,ammonia,COD and BOD5 reduction were utilized as output indices. An evaluation model of the efficiency of county-level sewage treatment services was established to analyze sewage treatment services and the Tobit model was used to identify key influencing factors. The results show that the combined efficiency of all county areas sewage treatment service is 0.637. The technical efficiency is 0.756 and the scale efficiency is 0.835. We found that 73.85% of counties are increasing their returns to scale. Emission reduction efficiency of sewage treatment service varies among regions. Scale,water load rate,location,population density and economic development levels all have a positive impact on emissions reduction efficiency;biological membrane technology is relatively superior. Many factors are useful in order for some of these sewage treatment facilities to improve their efficiency. Giving guidance according to regional characteristics,facilitating a culture of communication among sewage facilities in county areas,expanding or constructing sewage treatment facilities to appropriate size,utilizing local conditions to choose sewage treatment processes,strengthening the supporting pipe network construction and promoting rain and sewage diversion are all necessary to improve the efficiency of sewage treatment services in China.

Key words: county areas, sewage treatment service, emission reduction efficiency, DEA-Tobit two-step method, influencing factors