Single and Combined Effects of Copper and Nickel on Nitrification Organisms in Batch Units

Yıl 2017, Cilt: 2 Sayı: 1, 51 - 56, 25.02.2017

Sukru Aslan

Öz

Nickel and copper are widely encountered in the
industrial wastewaters. The purpose of this batch experimental study was to
evaluate single and combined effects of copper and nickel on the nitrification
organism activities. Trace amounts of Cu²⁺
stimulate the activity of nitrifiers and ARRs increased from 0.225 to about 0.5
mg NH₄-N/mg MLSS.day on the first day by elevating Cu²⁺
concentrations from zero to 0.05 mg/L, respectively. Nitrification inhibition
was not observed during the experimental studies for the studied Cu²⁺
concentrations. The ARRs of the nitrification organisms were also found
to have decreased by about 16 to 21 fold upon addition of Ni²⁺. Additions of Ni²⁺ negatively
affect the ammonium oxidation and reaction was not detected during the
operations of third day. The ARR values for the studied initial Ni²⁺
concentrations were lower than the blank sample. The simultaneous
presences of Ni²⁺-Cu²⁺ negatively affect the activity
of nitrification organisms. In order to achieve the same ammonium oxidation
level as compared with the blank sample, it needs more reaction times. The
experimental results indicated that it is possible to treat industrial
wastewater Ni²⁺ and Cu²⁺ with individually or together.
The toxicity of heavy metal could be minimized by increasing the microorganisms
in the biological reactor.

Anahtar Kelimeler

Copper, Nickel

Kaynakça

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