Siemens Wastewater Treatment Plant, Siemens Corporation, Fort Madison, Iowa
PSBA was hired for the design of a wastewater treatment plant, the relocation of a lift station, and the design of force main and gravity sewer mains connecting the new treatment plant to the current sewer system.
A new 8” diameter gravity sewer line was installed to the new lift station. The new lift station is an 80 gpm pump station. The new pump station is a wet well mounted lift station with all motors and pumps above grade. The pump station feeds a 4 inch force main to the treatment plant.
The treatment plant was designed for 20,000 gallon per day for 50 lb of BOD5 per day and 27.3 lb of total suspended solids. The plant is a package extended air activated sludge treatment plant. Facilities will be provided to waste sludge which will be hauled to an approved landfill. No sludge will be stored on site. The treatment plant will be followed by a disinfection station. The disinfection will be ultra violet light. The effluent will flow in an open ditch to a pond on site. There is no discharge off the site. All water from rainfall or sewage infiltrates into the ground prior to discharge. This entire facility is on sand and the surrounding area is sand. Per the regulations for a facility Reliability Class II and Unit Process Reliability Criteria A, a pond providing 5 days storage capacity of design flow was required. This pond is approximately 100 ft. square at the top with 4:1 side slopes because of sandy material. The pond will maintain 2 feet of water and be lined with a 30 mil liner. Facilities will be provided to divert flow from the force main to the holding pond and from the treatment plant effluent to the holding pond. The pond will have a lift station to return sewage to the treatment plant. No discharge is designed into the holding pond. The pond has 2 feet of freeboard and 3 feet of water above the 2 feet permanent water for a total 5 feet water depth.
The treatment plant and disinfection unit are housed inside a building with access on 4 sides and an overhead door for truck access.
The current plant has a generator for emergency power. The lift station will be on the plant emergency power. The treatment plant flows will be diverted to the holding pond during power outages.
Flows will be measured at the lift station by lift station run meters and a measuring weir will be provided at the treatment plant.