Hydrodechlorination of PCDD/PCDF/PCB contaminants by simple grinding of contaminated soils with a nano-size calcium reagent

摘要

PCDDs, PCDFs, and PCBs present in soil can be hydrodechlorinated without a preliminary separation (extraction) step using a nano-size dispersed mixture of metallic Ca and CaO (206 nm average particle size). The treatment is quite simple: grinding in an electric mortar (100 rpm) at room temperature in open atmosphere for 24 h, producing up to 91, 99 and 97% hydrodechlorination yield for PCDDs, PCDFs and PCBs, respectively. The method is sensitive to soil moisture content, but because of its simplicity and low-cost, it can accommodate larger-scale adaptation. (c) 2015 American Institute of Chemical Engineers Environ Prog, 35: 34-40, 2016