Optimized Design and Economical Analysis of Eco-Sponge water-logging Prevention System for Converter Stations

Abstract Converter station has the characteristics of high portion of hardening area, less green area and more high-voltage special equipment and facilities. An efficient coordination between water-logging prevention in the converter station area and environmental pollutants control is of great difficulty for design. So it is necessary to carry out sponge transformation in the converter station and set up ecological storage facilities. Based on the underlying surface condition and rainfall data of a large converter station park, multiple combined LID (Low Impact Development) facilities, such as permeable pavement and sunken green space, were constructed in the station area. In addition, the inundation area caused by runoff will create a natural anoxic area, combined with the aerobic area on the surface of the facility, the denitrification and nitrogen removal capacity of the system will be enhanced, effectively removing nitrogen pollution in runoff, and strengthening the nitrogen removal effect of conditional stormwater runoff. SWMM model is used to calculate the total runoff control rate and the pollutant reduction rate of drainage outlet. According to the simulation results, the stormwater management ability of the sponge reconstruction measures was assessed, and the economic benefit of the qualified reconstruction schemes was evaluated by AHP (Analytic Hierarchy Process).