Rapid toxicity assessment of water-soluble chemicals using a fed-batch reactor technique
✍ Scribed by Almanza, G. ;Cruz, L. E. ;Diaz-Baez, M. C.
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 329 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1053-4725
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✦ Synopsis
A rapid and sensitive technique for determining chemical inhibition of water-soluble compounds by using a fed-batch reactor is presented. A synthetic activated sludge was obtained through the isolation and purification of six different colony types from a domestic effluent. Through the synthetic activate sludge technique, the effect of different concentrations of chromium and copper solutions on the respiration rate of a mixture of bacteria was established. The percent inhibition ("A IC) of the microbial respiration was calculated by comparing it to the control mixture without the test substance. The results showed a %I C, , of 33 mg/L for Cr6+ and 6.5 mg/L for Cu2+. Inhibition kinetic parameters with the fed-batch reactor technique were evaluated. Both inhibitory and noninhibitory responses of chromium and copper were studied using a synthetic activate sludge. Substrate utilization rates and oxygen consumption rates started to be affected when the toxicant reached concentrations of 217 and 73 mg/L for chromium and copper, respectively.