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| Studies on technology of the electroplating sludge hydrothermal utilization |
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Abstract Continuous hydrothermal equipment was applied to dispose sludge and to separate heavy metals. Effect of the hydrothermal conditions parameters on sludge hydrothermal crack was investigated. It is shown by results that 100g electroplating sludge could be reduced to the general solid waste standards by adding 150mL 20% sulfuric acid under 250℃, 7MPa in 8 minutes. Studies of heavy metal separation and purification proved that 98.1% copper could be recovered by adding 1.25 times the theoretical amount of copper precipitator under pH 2.0, 80℃. More than 94% zinc could be extracted within 4 minutes equilibrium by 30% organic phase in the process of zinc extraction, O/A=2. Furthermore, 92% of chromium and 94% of nickel could be successfully recovered by the addition of 0.50 times the theoretical amount of calcium carbonate.
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Received: 16 July 2012
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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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