| Summary: | 碩士 === 國立交通大學 === 工學院永續環境科技學程 === 106 === Owing to the environmental awareness raising, the requirements and penalties of soil and groundwater pollution to the pollutions sites became stricter. Therefore, the quantity of contaminated soils that needed to be processed increases significantly thus its elimination becomes an important issue. Most of the pollution remediation sites use quick departure processing. And these contaminated soils are treated as recycled building materials. There is no clear environmental compatibility regulation for the remanufactured products produced in the polluted soil, Currently only the reuse industry are subject to license review, according to the Toxicity characteristic leaching procedure (TCLP) to confirm product quality.
In this study, four different dissolution tests, such as comparision of aqua regia digestion, TCLP, SPLP, and upflow filtration test, were used to simulate the release of contaminants from reconstituted products under different usage scenarios.
The results show that chromium in cement leaching in TCLP heavy metal tests does not exceed the environmental management standards. But the chromium leaching in Up-flow percolation test may cause the violation of the groundwater standard for drinking purposes (0.05 mg/L) in the early L/S ratios. So chromium contaminated soil not suitable for cement manufactory.Under the premise of effective control of the total content of heavy metals, the cement industry can use contaminated soil with heavy metals such as copper, nickel and zinc,and the red brick industry can use contaminated soil with heavy metals such as chromium, copper, nickel and zinc. Remanufactured products of contaminated soil with copper and zinc is suitable in the cement process better than red brick process. The two industries are similar when the soils are contaminated with nickel.
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