西部中小城市再生水项目投资效率研究

[目的]分析影响再生水投资效率的各项因素,为全面评价西部中小城市再生水项目投资效率提供理论基础。[方法]以陕西省渭南市为例,运用系统动力学方法,通过计算机仿真模拟渭南市2005—2014年的污水处理率、污水处理投资总额、污水处理项目总产出等因素的变化趋势,并在总产出中考虑再生水项目的外部效果来比较投资效率的变化。[结果]渭南市近10a来污水处理率逐年提高,传统评价方法得出投资效率呈递减趋势,而考虑外部效果的投资效率逐年递增。[结论]考虑再生水项目外部效果的评价方法可以全面、综合地研究再生水项目的投资效率,为再生水项目的建设提供决策支持。

Investment Efficiency of Reclaimed Water Projects in Small and Medium Cities in Western China

[Objective] This study aimed to analyze the factors that affect the investment efficiency of recycled water, and to provide a theoretical basis for the comprehensive evaluating investment efficiency of the reclaimed water projects in small and medium cities in Western China. [Methods] Using the method of system dynamics, the study worked out a computer simulation of 2005-2014 in Weinan City of Shaanxi Province and illustrated the change of investment efficiency of the total output in the reclaimed water project in consideration of the external additional effect. The simulated data included the processing factors of sewage treatment rate, total amount of investment, and the project output, etc. [Results] The sewage treatment rate in Weinan City had increased gradually, but the traditional evaluation method showed a decreasing trend of the investment efficiency. The study indicated that if the external effect was considered, the evaluation of investment efficiency considering was in accordance with the actual trend of increasing. [Conclusion] On the condition of considering the external effect, the evaluation method of the reclaimed water project was comprehensive and can provide decision support for the construction of the reclaimed water project.