Toxic effect of Ni(II) on urease activity in a anaerobic granular sludge
Efecto tóxico del Ni(II) sobre la actividad de la ureasa en un lodo anaeróbico granular
Abstract
The entrance of toxic substances such as metals, metalloids and others into biological wastewater treatment systems causes the inhibition of microbial activity, leading to a decrease in the efficiency of pollutant removal. Therefore, certain techniques can be implemented to check the physiological stability of microorganisms, such as the measurement of enzymatic activity, which is highly sensitive, reliable and representative to the changes that occur in bioreactors. In this work, the toxic effect of nickel (Ni) on urease activity was evaluated in a granular anaerobic sludge, through laboratory tests at mesophilic conditions in batch reactors. Five reactors fed with synthetic wastewater containing concentrations of 0 (control), 0.5 (R1),10 (R2), 50 (R3) and 100 (R4) mgNi(II)/L were used, applying a hydraulic retention time of 24 h for 30 d. Every 3 d the levels of pH, total alkalinity, chemical oxygen demand, volume of biogas and methane, inhibition of methane production (IMP) and urease activity were quantified. The increase in Ni(II) concentrations led to a significant decrease (p<0.001) in urease activity, from 1.21 (control) to 0.27 (R4) mg/dL, accompanied by an increase in IMP up to 13.3 %. The toxic effect of Ni(II) on the physiological state of anaerobic microorganisms present in the granular sludge was evidenced, with urease activity inhibition and impairment of anaerobic digestion process, which reduces the efficiency of these biological treatment systems.
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