- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | GONG Zhengjun, WANG Yugang, YE Zilin, GONG Xinying, TONG Yuanjun, HUANG Xiaoying, WEN Xiaohui. Pollution Characteristics and Risk Assessment of Drill-and-Blast Construction Wastewater in High-Altitude Tunnels[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20260035
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To clarify the occurrence characteristics and ecological risks of pollutants (e.g., heavy metals and organophosphate esters) in the construction wastewater of drill-and-blast tunnels, two tunnels under construction on the Qinghai-Tibet Plateau were taken as the research objects, and the water quality parameters, pollution characteristics, sources, and environmental risks of the construction wastewater and surrounding water bodies were analyzed. The research results indicate that the construction wastewater exhibits the characteristics of high turbidity (average of 43.7–100 NTU) and alkalinity (pH reaches 8.2–12.0) and contains high concentrations of petroleum pollutants (average concentration of 15.5–22.1 mg/L), which are mainly derived from pollutions such as mechanical lubricants; the metal elements are mainly Fe and Al, and the anions are mainly Cl− and SO42−, whose main sources are the use of accelerators/coagulants and the dissolution and release of minerals; the total concentration range of OPFRs is 14.0–6 060 ng/L, and the main components include tributyl phosphate and tris (2-chloroethyl) phosphate, which may be sourced from construction materials and lubricants; the environmental risk assessment shows that the maximum value of the risk quotient of 2-ethylhexyl diphenyl phosphate in the tunnel construction wastewater and surface water reaches 0.68–1.83, indicating that it has moderate to high ecological risks, and the accumulation of tris (2-chloroisopropyl) phosphate and trioctyl phosphate in the tunnel construction wastewater is worthy of attention. The migration and transformation patterns of composite pollution during the construction process of high-altitude tunnels are revealed, providing a scientific basis for the optimization of green construction technologies and the precise control of pollutants.
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