Comparing the Tolerance Limits of Selected Bacterial and Protozoan Species to Vanadium in Wastewater Systems

• Published in: Water, air, and soil pollution air, and soil pollution, 2012-06, Vol.223 (5), p.2525-2539
• Main Authors: Kamika, I., Momba, M. N. B.
• Format: Article
• Language: English
• Subjects: Aspidisca; Atmospheric Protection/Air Quality Control/Air Pollution; Bacteria; Bioremediation; Chemical oxygen demand; Climate Change/Climate Change Impacts; Crack opening displacement; Dietary supplements; Dissolution; Dissolved oxygen; Earth and Environmental Science; Environment; Environmental monitoring; Heavy metals; Hydrogeology; Industrial wastewater; Laboratories; Liquor; Metals; Microorganisms; Minimum inhibitory concentration; Oxidation; Oxygen demand; Protozoa; Sewer systems; Soil pollution; Soil Science & Conservation; Species; Studies; Temperature tolerance; Tolerances; Toxicity; Vanadium; Waste water; Wastewater; Water Quality/Water Pollution; Water treatment
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-011-1045-9

This study compared the tolerance limits of selected bacterial ( Bacillus licheniformis , Brevibacillus lactosporus and Pseudomonas putida ) and protozoan ( Aspidisca, Trachelophyllum and Peranema ) species to V 5+ in wastewater systems. The isolates were exposed to various concentrations of V 5+ (from 10 to 240 ppm), and their tolerance limits to this heavy metal were assessed at different temperatures (25, 30, 35 and 40°C) and pHs (4, 6, 7, 8 and 10) for 5 days. Chemical oxygen demand (COD), dissolved oxygen (DO) and die-off rate of the isolates were measured using standard methods. The results indicated that test isolates were tolerant to V 5+ , with a gradual decrease in their colony/cell counts when V 5+ concentration gradually increased. Bacterial species were found to be more significantly tolerant (MIC: 110–230 ppm V 5+ ) to V 5+ than protozoan species which showed an earlier total inhibition/die-off rate (100%) at 60–100 ppm V 5+ (MIC) ( p