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| Distribution of heavy metals during co-processing hazardous wastes in new dry cement kilns. |
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Abstract Distributions of 13 heavy metals in different phases produced by co-processing obsolete pesticides, contaminated soil and spent bleaching clay were studied on three new dry cement kilns respectively. Through analysis of the distribution ratios of heavy netals in stack emissions and cement clinkers, both ratios were steady no matter whether the hazardous waste was fed to the kiln or not. Moreover, the distribution ratios of non-volatile and semi-volatile heavy metals in stack emissions were far less than that in clinkers. The concentrations of Hg and several heavy metals in stack emissions were low or below the detection limit. In particular, the distribution ratio of As in stack emissions was high. Some As compounds would be volatile due to their chemical form in cement kilns. In order to control heavy metals concentration in stack emissions to comply with emission limitations of correlated standards, both maximum allowable feeding rates and concentrations of heavy metals during co-processing waste were determined at last.
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Received: 24 February 2009
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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