15 Articles found
Challenge Technology Articles
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The Challenge AER-200 Respirometer System for anaerobic applications
The CHALLENGE AER-200 Respirometer System consists of one or more biological reaction vessels, gas flow measuring cells, and a computer. The gas measuring base contains eight flow cells and associated interconnecting circuitry. As gas flows through ...
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Oxygen Uptake Rate (OUR) Fingerprints
Pharmaceutical Wastewater
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OUR Set-Point Control of Activated Sludge Processes
The OUR Set-Point method is useful for controlling the activity and loading-rate capacity of an activated sludge mixed liquor. In this case, sufficient amounts of a stock substrate are added to a mixed liquor suspension to provide kinetic saturation ...
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Measuring Short-Term BOD
Measurement of oxygen uptake rates in activated sludge processes is essential to their satisfactory operation. Traditionally, oxygen uptake rates (OUR) have been determined by using a dissolved oxygen probe to measure the change in dissolved oxygen ...
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Toxicity Assessment Using a Dilution Series
Toxicity, or more appropriately, inhibition, is a measure of the interference of a compound or compounds with biodegradation. Since inhibition usually is expressed as the interference with bioconversion of an oxygen-consuming reaction – or gas ...
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Biodegradation Tests for Wastewater Samples
Biodegradation Tests for Wastewater Samples Biodegradation tests usually involve comparison of the oxygen uptake of a test sample – or gas production for anoxic or anaerobic tests – to that for a readily biodegradable control substrate (usually ...
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Assessment of Acute Toxicity to Treatment Plants
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 ...
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Assessing Nutrient Deficiencies
Assessing Nutrient Deficiencies The Challenge AER-200 respirometer system is ideally suited for assessing the occurrence of nutrient deficiencies as illustrated in the figure below. In this case various amounts of a mixture of nutrients and trace ...
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Extant Kinetics Of Mixed Wastewaters
Extant Kinetics Of Mixed Wastewaters OUR fingerprints can be used to estimate kinetic parameters for the wastewater constituents as shown in Figure A and B below. Wastewater A contained one group of readily degraded compounds and one group that ...
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Intrinsic Biodegradation Kinetics Of Chemicals
Intrinsic Biodegradation Kinetics Of Chemicals An understanding of the rate of biodegradation kinetics for specific industrial chemicals is useful when evaluating their treatability or their impact on treatment processes. The objective of kinetic ...
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Anaerobic Biomass Activity Tests
Anaerobic Biomass Activity Tests The methane production activity of anaerobic sludges is related to the history of the sludge, the biomass yield from the wastewater the sludge has been treating, the fraction of methanogens, and the presence of ...
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Anaerobic BMP and ATA Tests
Anaerobic BMP and ATA Tests Biochemical Methane Potential (BMP) tests involve addition of test chemicals or wastewater samples of concern to an anaerobic culture that is contained within a sealed vessel. Methane or total gas production are ...
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Treatability assessments- batch versus continous culture tests
Abstract Batch and continuous culture reactors are used widely for conducting treatability assessments of industrial wastewaters. Batch tests have the advantage of producing results on a rather rapid basis -typically hours or a few days. The major ...
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Treatment of oil contaminated soil from a wyoming refinery
An oily soil sample was shipped from the refinery site to the test Laboratories on June 17, 1995. The sample was stored at 4 °C until testing began. The sample was in the form of a dense pasty mud, black in color, and consisted of oily residues ...
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Use of anaerobic respirometers for measuring gas production in toxicity and treatability tests
Introduction Anaerobic processes are used widely for stabilizing domestic sludges, treating industrial wastes, and converting biomass to methane. These processes frequently receive complex organic chemicals that are classified as being hazardous or ...