Abstract
Simulated landfill columns with heavy metal contaminated construction and demolition under different acid rain conditions have been established. Hydration products in cement such as silicate, aluminate, calcium hydroxide, etc. may release into the leachate with rainfall, which ultimately leads to the increase of pH to 11–12. Leaching of inorganic matter during landfilling causes a higher total dissolved solid and electrical conductivity compared with those of municipal and industrial wastewater. On the other hand, the concentration pattern and cumulative release of Cu, Cr, and Cd is arranged in the order of neutral rain (pH=4.8)<weak acid rain (pH=5.8)<strong acid rain (pH=3.8) condition. Zn poses the highest migration capacity whereas Cd has the lowest. Negative exponential model decay model accords well with cumulative release of heavy metals. Decay rate is slow in simulated enclosed workshops even for volatile pollutants, 70% or more can be remained after 120days. The similar conditions appear around the reaction pool and leaked pipes of enclosed workshops. Sunlight and temperature are the most important regulators of organic pollutant degradation. Residual rate of fenvalerate in the multisystem of water–demolition waste–soil system is approximately 7% higher than that in water–demolition waste system.
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