Abstract
The destruction of DDT formulations and DDT contaminated soil was conducted by feeding wastes into the flue gas chamber at the kiln inlet of two different preheater/precalciner cement kilns in China. The concentration of DDT, PCDD/PCDFs and HCB were measured in the flue gas of the main stack, in the solid material under baseline conditions and when feeding DDT-wastes. The destruction efficiency and the destruction and removal efficiency for DDT were in the range of 99.9335%–99.9998% and 99.9984%–99.9999%, respectively. The emissions of PCDD/PCDFs and HCB in the flue gas varied in the range of 0.0019–0.0171ng I-TEQ/Nm3 and 0.0064–0.0404μg/Nm3, respectively. The emission factor for PCDD/PCDF and HCB varied from 0.0137 to 0.0281μg/ton and from 17.32 to 109.34μg/ton of clinker, respectively. The concentration of PCDD/PCDFs and HCB in solid samples decreased as follows: cement kiln dust, 4.1–5ng I-TEQ/kg and 0.70–0.71μg/kg, respectively; >raw meal, 0.82–0.97ng I-TEQ/kg and 0.18μg/kg, respectively; >cement clinker, 0.09–0.22ng I-TEQ/kg and 0.14–0.18μg/kg, respectively. This study indicates that the feeding of DDT and POPs-wastes to the lower temperature part of a cement kiln system possibly to create a buildup of trace not-destroyed compounds in the system and might cause emissions; the technical feasibility and the environmental acceptability of this practice need to be investigated thoroughly.
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