Environmental risk characteristics and temporal and spatial differentiation characteristics of fly ash road filling and utilization
SUN Shu-na1,2, CHEN Hong-wei1, SHE Kai-lang2,3, PENG Xiang-xun1, YU Zhen-yang1, YAO Guang-yuan2, XU Ya2
1. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. State Key Laboratory of Environmental Benchmarks and Risk Assessment, Research Institute of Solid Waste Management, Chinese Research Academy of Environment Science, Beijing 100012, China; 3. College of Municipal and Environmental Engineering, Jilin University of Construction, Changchun 130118, China
Abstract：A comprehensive risk-based method was proposed to assess the potential risk and spatio-temporal differentiation of shallow groundwater resources (in terms of drinking water quality) in the process of recycling fly ash road base materials under the influence of comprehensive consideration of pollutant release changes caused by long-term weathering, regional climate conditions and parameter uncertainty. It could be used to evaluate the recovery potential of alkaline wastes (such as incineration fly ash) to partially replace highway cushion materials. The results of the leaching test for estimating the source concentration were combined with the fate migration model commonly used in the risk assessment procedure. The pollutant release under unweathered and weathered conditions was simulated through the laboratory leaching test. The impact of parameter uncertainty on the risk was simulated by Monte Carlo method, and the impact of different climatic characteristics on the characteristics of environmental risk areas was evaluated. The results showed that under the typical climatic conditions in North China, among the seven identified target pollutants, the predicted concentrations of Zn, Cd and Pb at the exposure points might exceed the standard, with the probability of exceeding the standard of 34%, 96% and 7% respectively. As a result, their exposure concentrations (represented by 95% quantile) exceeded the standard, and the environmental risk could not be ignored; Carbonation would change the dissolution characteristics of some pollutants and led to changes in long-term risks. Specifically, with regarded to the exposure concentration after carbonation, Cd showed a downward trend, Ni and Zn remained basically unchanged or changed slightly, Cr, Cu and as increased significantly but were still significantly lower than the standard limit, while the exposure concentration of Pb ions increased significantly and the exceeding standard increased from 1 to 3. 5 times, which requires special attention; Due to the influence of regional differential parameters such as rainfall, the risk difference between different regions was large, and the exposure concentration difference between the arid and semi-arid regions with the largest difference was nearly 2 times; The common pollutants exceeding the standard in different areas were Zn and Cd. In addition, there were Pb exposure concentrations exceeding the standard in humid/semi humid areas.
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