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Dissolved Oxygen Uptake Rate (DOUR) Test
Biological waste treatment in the Aerated Stabilization Basin (ASB) process and in Activated Sludge systems is based on the ability of microorganisms to utilize dissolved oxygen in the process of breaking down the soluble organic substances present in the process...
Troubleshooting Aerated Stabilization Basin
Aerated Stabilization Basin (ASBs) performance can be associated with numerous root causes, both chronic and intermittent. The three main conditions leading to loss of system performance and potential permit violations are discussed below. Temporary upsets due to...
Eight Growth Pressures of Biological Treatment in Aerated Stabilization Basins: Part 5
Part 5 of 8: Retention Time and Flow Patterns Time is the bacteria's friend. Long retention times reduce the system's dependence on bacterial reproduction and reduce nutrient requirements. Retention time is also critical so that log growth can be completed and...
Eight Growth Pressures of Biological Treatment in Aerated Stabilization Basins: Part 4
Part 4 of 8: Dissolved Oxygen Dissolved oxygen is a critical growth pressure. The presence or absence of dissolved oxygen determines the type of metabolism. Much has been written and discussed the proper dissolved oxygen residual...
Biological Growth Curve in Aerated Stabilization Basins
Bacteria are present throughout an aerated stabilization basin, though their form and concentration may differ in the different areas of the ASB. At the front end of the ASB, where the influent enters and there is the highest concentration of BOD, bacterial...
Filamentous Bacteria in Aerated Stabilization Basins Part 2
Concern or Curiosity? Part 2 - Thiothrix and Type 021N Mike Foster, Principal Consultant - Environmental Business Specialists, LLCPaul Klopping, Principal Consultant - Callan & Brooks In part one of this series, we discussed the differences between activated...
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