Testimonials
“We have found the performance of the system to be quite satisfying and user friendly. We are currently running low level O2 uptake experiments and are impressed with the sensitivity of the instrument.”
“I have found the performance of the Challenge AER-200 to be unmatched. The precise measurement of oxygen consumption, homogenous mass transfer of test materials, and constant and consistent operating temperature have enabled me to obtain extremely accurate test results, particularly as compared to other respirometer systems. I find the Challenge system to be extremely user friendly.”
Assessment of Acute Toxicity to Treatment Plants
Situations often occur where rapid assessment of potential toxicity to a treatment process is needed, for example, when hauled wastes are discharged to treatment plants. In these cases, the test wastewater is added in various ratios to a mixed liquor suspension along with an organic substrate that is known to degrade well by the test culture. Acetate seems to work well in most cases. Increases in oxygen uptake above that for the control substrate indicate a lack of toxicity as shwn in Figure A. Decreases in oxygen uptake relative to the control indicate potential toxicity as illustrated in Figure B. More detailed respirometric assessments – such as those provided by OUR fingerprint analysis – can provide additional insight into the impact of these wastewaters on treatment plant performance.