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Temperature: When temperature climbs, the particles, molecules, atoms, etc. get <br /> more and more energy, and move more quickly. As these particles bounce around <br /> more, they collide with each other and can break the bonds that hold them together. <br /> DO particles can then have the bonds that hold them in the liquid break, and they can <br /> bounce out of the solution. <br /> Therefore, the higher the temperature, the lower the DO concentration. Inversely, <br /> as temperature decreases, particle motion decreases, and therefore DO <br /> concentrations go up. The operator will need to compensate for changes in the <br /> weather by increasing or decreasing the air supply, typically in the spring and the fall <br /> to maintain the DO in the proper range. <br /> Bacteria Levels: Similarly, as the number of bacteria increase in the aeration tank, <br /> they consume more oxygen and thus cause the DO levels to decrease. Inversely, as <br /> levels of bacteria decrease DO levels increase.The operator will need to compensate <br /> for increased levels of bacteria by either wasting longer/providing less aeration or <br /> conversely wasting less/providing more aeration as bacteria levels decrease. <br /> • Settleometer Test <br /> Settleometer testing measures how fast and how cleanly the biomass will settle. As the <br /> sludge settles in the beaker the sludge elevations are recorded at 5-minute intervals. The <br /> data recoded is then charted to visually identify the settling rate. <br /> Settleometer Analysis - <br /> 100% <br /> i <br /> 8096 ? <br /> "knee of the curve" t <br /> 6096 <br /> 40% a <br /> 209' — <br /> a 1 <br /> 0% ! <br /> E E _ E E # <br /> o n o o n c <br /> Photographs curtesy of Class A training Manual Ohio EPA <br /> The data shown above indicates that the bacteria settled fairly fast in the first 5 minutes, <br /> but that the settling rate decreased and had less compaction as time went on. Based on <br />