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Abstract In order to evaluate the performance and affecting factors of a limestone ditch-compost wetlands system to treat acidic mine drainage (AMD), a pilot test for six months was conducted with the measurements of effluents quality and plant growth-related parameters. Results show that limestone ditch (LSD) can effectively increase pH, decrease acidity and heavy metals of AMD, but the efficiency declined with the accumulation of metal hydroxides in LSD. The acidity and heavy metals decreased significantly after passing through compost wetlands, the acidity of the effluents decreased continuously and concentrations of Cd, Pb were below the levels of detection, the mean concentrations of Zn, Cu were 1.8mg/L, 2.6μg/L, respectively, which conform to the standards for irrigation water quality. However, much higher concentrations of Cd, Zn were found in the effluents of wetlands without the addition of compost. Sedum alfredii Hance planted in wetlands grew and extracted normally Cd/Zn. Alkalinity production in compost wetlands were inhibited in the presence of Typha angustifolia, and the acidity of the effluents were increased, but heavy metals removals were not significantly affected by planting Typha angustifolia.
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Received: 12 March 2015
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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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