RSA - Model PF-4000 - 4-Position Respirometers
RSA’s PF-4000 is a 4-position respirometer with the same features of our PF-8000 Pulse-Flow respirometer. They are designed specifically to measure oxygen uptake for aerobic biological reactions and gas production from anaerobic and anoxic biological reactions, but in a smaller footprint.
Products Details
The WBC and Heater/ coolers or heater-only units are an important part of our respirometer systems. Since we use pressure to measure differentials, we state that you should operate your respirometer within plus or minus 1 degree Celsius to insure no errors due to temperature fluctuation. We can quote water baths and heater/coolers or heater-only units for your respirometer package, If you have an incubator or temperature control room you may eliminate the need of ordering temperature control from RSA.
The lowest increment of oxygen uptake is 0.05 mg. The highest oxygen uptake rate for the standard system configuration is 1,200 mg/hr. Rates can be increased more than 10-fold by adding simple plug-in flow expansion modules. These high rates are useful for monitoring oxygen uptake in large laboratory-scale pilot units.
All standard Pulse-Flow respirometer systems can be operated in aerobic or anaerobic modes without the need to purchase separate control modules or complicated hardware. Anaerobic-only or aerobic-only systems are available on request.
Applications
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Respirometry System for Determination of Biodegradation Kenetics - Monitoring and Testing - Health and Safety Monitoring and Testing
Intrinsic kinetic tests involve adding relatively high concentrations of organic substrate to small concentrations of acclimated microorganisms so that the COD/VSS ratio typically is greater than 10. Kinetic parameters are then determined by non-linear modeling using well-known relationships between biological growth and oxygen uptake.
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Respirometry System for Anaerobic Biochemical Methane Production - Monitoring and Testing
Anaerobic biodegradation tests – often referred to as Biochemical Methane Production (BMP) tests – involve addition of known amounts of a chemical or wastewater to anaerobic cultures. The quantity of methane production – relative to that from a control – indicates the biodegradation potential. This case study shows methane production for a Control reactor and three test reactors that were operated at 20-, 30- and 45-day retention times and received three doses of industrial wastewater. The ...
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Respirometry System for Biomass Activity Testing - Energy - Bioenergy
Pulse-Flow respirometers can be used to assess biomass activity for aerobic and anaerobic reactions. In aerobic tests, cultures are combined with nutrients, trace minerals, and an organic substrate – such as acetic acid or ethanol. The maximum oxygen uptake rate reflects the amount of active biomass in the test culture. Examples are shown below:
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Respirometry System for Anaerobic Toxicity Testing - Monitoring and Testing
This example shows the results of dosing an anaerobic culture with three concentrations of an industrial cleaning agent followed by respirometric measurement of methane production. The threshold toxic concentration was less than 80 mg/L of product and 600 mg/L produced a 50% decrease in methane production rate.
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Respirometry System for Aerobic Toxicity Testing - Monitoring and Testing
This example shows the results of respirometer tests in which three concentrations of cyanide were added to a aerobic test culture that received phenol as an organic substrate. The threshold toxic concentration of cyanide was 1 mg/L
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