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| Inhibition dynamics of heavey metals on the anaerobic degradation of 2-chlorophenol |
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Abstract The effects of Cu2+, Cd2+, Ni2+, Fe2+ on 2-chlorophenol (2-CP) anaerobic degradation velocity and their inhibitive dynamics were studied. Fe2+ had almost no inhibition on 2-CP degradation process with the injection concentration between 0 and 500mg/l, while Cu2+, Cd2+, Ni2+ presented obviously negative function and the relative toxicity was Cu2+>Ni2+>Cd2+. CIP could be used to evaluate the relationship between metal concentration and inhibitive strength. Furthermore, inhibition kinetic equation could be applied to depict the characteristic of metal ion inhibition and quantity relationship between the maximum inhibiting concentration of metal ions and their dosage and was also able to evaluate the inhibition level of heavy metal ions. According to the equation fitting results the strongest inhitory concentrions (I*) of 25mg/L Cu2+, Ni2+, Cd2+ were 458.7, 1693.5, 1528.5mg/L respectively. And the values of I* and m revealed that the relative inhibitive strength of these metals on 2-CP degradation was Cu2+>Ni2+>Cd2+.
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Received: 20 August 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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