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Frankfort, MI |
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Frankfort, MI |
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Design Flow Ave: 0.575 MGD Peak: 1.42 MGD Current: 0.376 MGD
Effluent Limits BOD: 20 mg/L TSS: 30 mg/L
Lakeside Equipment Four (4) Magna Rotors, Baffles and Covers Two (2) Weirs Two (2) Spiraflo Clarifiers Two (2) Telescoping Valves
Equipment Maintenance Running 24 hours per day with one hours of routine maintenance, on average
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In 1989, when the Betsie Lake Utility Authority (BLUA) wastewater treatment plant was installed, the treatment system included a Closed Loop Reactor (CLR) with two (2) Magna Rotors, one (1) Hinged Plate Weir and two (2) Spiraflo Clarifiers.
BLUA added a second CLR in 2003, with two (2) Magna Rotors and one (1) Rotating Weir. Additionally, a Transfer Pipe was installed between the two reactors, allowing the flow to transfer between the two reactors. This pipe provides flexibility to operate the two reactors in parallel or series operation.
For parallel operation, the influent is split equally between the two CLRs and both reactors operate in aerobic conditions, which provides high levels of BOD and TSS removal and an effluent ammonia level of 1 mg/L or less. In this mode of operation, the transfer pipe is closed and the effluent weirs are open in both reactors.
The plant is currently operating in series operation where influent is first sent through anoxic conditions in the first reactor, with a low dissolved oxygen state of 0 to 0.5 mg/L. The flow is the directed to the second reactor with aerobic conditions, a high dissolved oxygen state of 1.0 to 2.0 mg/L. In this mode, the CLRs are capable of achieving denitrification with high levels of BOD and TSS removal, an effluent ammonia level of 1 mg/L or less and a total nitrogen level of 10 mg/L or less. To operate in this mode, the effluent weir is closed in the first reactor and the transfer pipe is open to allow the flow to move onto the second reactor. An added benefit of running this mode is achieving soluble phosphorus removal without using chemicals.
After the CLR Process, wastewater is then sent on to two (2) Spiraflo Clarifiers. The peripheral-feed design of the Spiraflo directs influent along the narrow raceway formed by the skirt and outer wall. After the flow transfers under the skirt, solids settle at the bottom of the tank and wastewater is discharged into the centrally located effluent weir. |
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