engleski

Toxicity of aluminium originating from zeolite A on the Acinetobacter junii

The antibacterial effect of commercial zeolite A against the pure culture of phosphate- accumulating bacterium Acinetobacter junii was investigated. The estimated EC50 values of the zeolite for the inhibition of bacterial colony forming units was 0.33-0.37 g/L by investigated initial pH values of 6, 7 and 8. The toxic effect of zeolite is ascribed to the generation of Al (0.38-1.09 x 10-2 g/L) and Si (2.02-2.93 x 10-2 g/L) ionic species during the process of hydrolysis and dissolution of zeolite (leaching of Al, Si and Na). The toxic effect of Al was confirmed in separate experiments, where the aluminum toxicity (in the form of aluminum sulphate) was estimated as EC50 of 3.45-3.89 x 10-4 g/L. These results suggest the importance of controlling the amounts of synthetic zeolites which can be released to different compartments of environment and accumulate there as nondegradable material. Zeolite A may be the important source of Al in influent of the biological wastewater treatment systems, where they can cause unwanted antibacterial effects.

zeolite A ; wastewater ; bacteria ; toxicity

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