Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5743978 | Ecological Engineering | 2017 | 8 Pages |
Abstract
Individual and combined effects of Ni2+ and Cu2+ concentrations on the nitrification process were investigated in a submerged biofilter. The activity of nitrification organisms was inhibited by high concentrations of Cu2+. However, low concentrations of Cu2+ promoted NOB activity. There were no observable stimulation effects of Ni2+. The presence of 0.2-4.0Â mg/L Ni2+ caused a decrease in the rate of nitrification. Although the inhibition of Cu2+ on the nitrification organisms started at a concentration of 0.5Â mg/L, it started at 0.2Â mg/L for Ni2+. Ni2+ had stronger inhibitory effect on the nitrification organisms than Cu2+. Using a mixture of Ni2+ and Cu2+, inhibition level drastically increased to 32% and 49% at concentrations of 2.0 and 3.0Â mg/L, respectively. At the same concentrations, individual inhibition by Ni2+ and Cu2+ was much lower, about 12-15% and 18-24%, respectively.
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Authors
Sukru Aslan, Onur Sozudogru,