Abstract
Based on the investigation on the collection and treatment of the runoff from the bridge-deck of some expressways involving sensitive water bodies, this paper proposed an integrated design idea of the emergency storage facility and the bridge-deck rainwater runoff treatment facility for the transportation accident of dangerous chemicals in the expressway. The integrated design idea improves the disadvantages of simultaneous treatment of rainwater and accident-water in the bridge-deck runoff treatment system. The process flow, plane layout, functional unit volume design, conversion device, and control system involved in the integrated design are discussed.
Highlights
Based on the sedimentation tank treatment, some projects are united with the constructed wetland, sand filter and other rainwater runoff advanced treatment technologies, and the sedimentation tank is used as the emergency storage facility for hazardous chemicals leakage
After meeting the specified discharge standard, it will overflow and discharge automatically; In case of transportationaccident leakage of hazardous chemicals, turn the twoposition three-way valve to make the end of the valve leading to the oil separation and sedimentation tank closed, and open the valve leading to the accident tank at the same time
In order to realize the separate treatment of hazardous chemicals accident runoff and rainwater runoff, the conversion device needs to have the role of diversion
Summary
The water environmental safety risk caused by the leakage of dangerous chemicals transportation accident is the leading environmental risk during the operation period of the expressway in the centralized drinking water source area, water source protection area, class II and above surface water body and other water environment sensitive areas. To prevent the environmental risk of hazardous chemicals transportation accidents during the highway operation period, the former State Environmental Protection Administration, the National Development and Reform Commission and the former Ministry of communications jointly issued the notice on Strengthening the Environmental Impact Assessment of Highway Planning and Construction (HuanFa [2007] No.[184]) This notice requires that for bridges crossing sensitive water bodies, on the premise of ensuring safety and technical feasibility, a bridge-deck runoff collection system should be set up on the bridge, and sedimentation tanks should be set up on both sides of the bridge to deal with the bridge-deck runoff after a pollution accident, so as to ensure the safety of drinking water. It is not suitable to be used in combination with other nonhazardous chemical accident emergency functions
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