Waste Water Treatment Plant, Manistique, Mi.
In July, 2000, at an approximate cost of $2,500,000, refurbishment of the Manistique sewage treatment plant was completed. The redesigned waste water treatment facility had the old rotating biological contactor (RBC) primary treatment system replaced with an activated sludge system. The new design boasts the addition of 2 activated sludge primary treatment tanks for micro-organism breakdown of wastes. Pressurized air to the diffusion plumbing in the tanks is fed by a manifold of large diameter stainless steel pipe from a pair of identical variable speed drive blowers housed in the building at the East end of the tanks.
The inside of the blower building showing the pair of blowers. The system is designed such that each treatment tank may be operated independently of the other and only one blower is used at a time, at 16% of capacity, allowing for ease of maintenance, maximized reliability, and future expansion.
The system of new, high efficiency recirculating pumps and plumbing recirculate a portion of the primary tanks' output back to the input to accelerate the micro-organism digesting process. They are located in the basement of the main building.
The new high efficiency boiler, located with the recirculating pumps in the basement of the main building, is necessary to maintain an appropriate plant operating environment to insure men and equipment are working at peak efficiency. Both tend to fail during long periods of sub zero weather.
From 3 separate points in the waste water treatment process, these new units sample the effluent flow automatically, periodically. The samples are then analyzed in the plant's lab to determine the overall plant effectiveness.
Many other necessary and costly items such as new pumps, motors, control circuitry, instrumentation, etc. were installed to complete the upgrade but are not shown.
Manistique water and sewage plant infrastructure costs and financing, not covered by grants, is
paid with higher taxes and/or costs for product and service. In this case, higher water and sewer