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.”
Compared Chemical Waste Profiles
OUR measurements were made for two waste streams from a chemical production plant using a Challenge AER-200 respirometer system. The fingerprint for Waste 1 indicated the presence of three major groups of organic constituents. The first group of readily biodegradable organic constituents is oxidized at oxygen uptake rate through about one hour of contact. Oxidation of a second group of constituents causes the OUR to increase through about 3.5 hours of incubation. This increase in OUR is caused by growth of microorganisms during the oxidation reaction. Oxidation of a third group of constituents – in this case thought to be nitrification – extends beyond six hours of contact. The test was terminated before oxidation was complete. The OUR fingerprnt for Waste 2 shows a sharp biodegradation peak for readily biodegradable organics followed by a small plateau between one and 1.5 hours. The fact that the OUR for Waste 2 returned to endogenous within five hours indicates the biodegradation reaction was essentially complete.