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Pre-Treatment Building
The state of the art pretreatment building accepts all of the sanitary waste via 6 lift stations. It's responsible for receiving and monitoring flow, screening non-organic materials and odor control. |
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Step Screen
Screening non-organic materials.
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Step Screen & Screw Press
The screenings are conveyed through a screw press to remove the excess water. |
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Dumpster
At the end of the screw press the screenings are dropped into a hopper then hauled to a landfill.
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Vertical Loop Reactor
After pretreatment, the organic material enters into one of two biological treatment methods or activated sludge process. The current method in use is a Vertical Loop Reactor (VLR). The District’s VLR is one of only 3 currently in operation in Indiana. |
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VLR Diagram
The VLR contains a microbial mass (bugs) in order to metabolize harmful organic contaminants. Ammonia is the most important contaminant to remove by treatment. By controlling the oxygen level and the quantity of organisms in the VLR we can control the efficiency of the treatment.
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VLR
Ammonia and phosphorous must be removed in order to sustain ecological habitats in our receiving streams and lakes.
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Orbal Oxidation Ditch
The Orbal functions in the same manner as our VLR system.
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Clarifiers
Secondary treatment consists of 4 clarifiers. The clarifiers accept the flow from the VLR and Orbal. The purpose is to separate the solids and the water.
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Return Building
The settled solids will then be returned back to biological treatment or permanently removed from our treatment system via pumps.
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Sludge Holding Tank
A percentage of solids are removed from the bottom of the clarifiers and pumped to one of our 3 sludge holding tanks. The solids are aerated and settled in order to remove the excess water and sent through the treatment process.
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Drying Beds
The remaining solids are either pumped to one of our 8 drying beds where the solids are stored to dry before hauled off or removed by hauling away as a liquid. Eventually all of the biosolids are land applied for agricultural beneficial use. |
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Plant Effluent
The process for the plant's effluent consists of UV Disinfection, Sampling and Aeration. |
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Ultra Violet Disenfection
The method of treatment is ultraviolet light (UV). The UV light destroys the reproductive cells of disease causing bacteria which inhibits further growth. E-coli is the indicator organism that is tested in order to determine the effectiveness of disinfection.
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Aeration
The effleunt is provided with mechanical aeration to sustain biological life in the receiving stream. |
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Quality Control
Finally, the flow is sampled for removal of organic materials, pH levels and Dissolved Oxygen content. |
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