Inhibition of PCDD/Fs formation from dioxin precursors by calcium oxide.
Research aimed at understanding the inhibition effect of CaO on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) formation form dioxins precursors, such as chlorophenols (CPs) and chlorobenzenes (CBs). The results indicated that a clear dioxin inhibition effect occurred both in open and sealed system when CaO was used. In the open system, PCDDs were the main congeners and the inhibition efficiency was all over 99% in the experiments. In the experiments with CaO, less than 0.1% of the initial PCP was detected in the absorption tube and only about 1% of the initial PCP was examined as calcium pentachlorophenate in the reaction tube. In the sealed system, the inhibition efficiency was over 90% at temperature range between 280 and 450 degrees C when PCP was used as model precursor. When HCB and 2,3,4,5-T4CP replaced PCP, significant inhibition effect was also observed. As CaO has the advantageous properties of non-toxicity and non-volatile nature, it is our hope that the result will contribute to the development of a new technique to cope with the problem of dioxin pollution in MWIs.
Liu
Wenbin
W
State Key laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, PR China.
Zheng
Minghui
M
Zhang
Bing
B
Qian
Yong
Y
Ma
Xiaodong
X
Liu
Wenxia
W
D000397:Air Pollution / Q000517:prevention & control; D001572:Benzofurans / Q000032:analysis / Q000737:chemistry*; D017610:Calcium Compounds; D002733:Chlorophenols / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D006581:Hexachlorobenzene / Q000737:chemistry*; D017745:Incineration; D010087:Oxides; D010416:Pentachlorophenol / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry
D001572:Benzofurans; D017610:Calcium Compounds; D002733:Chlorophenols; D000072338:Dibenzofurans, Polychlorinated; D010087:Oxides; D000072317:Polychlorinated Dibenzodioxins; D006581:Hexachlorobenzene; C009408:tetrachlorophenol; C016538:lime; D010416:Pentachlorophenol