Description

Safety Forums provide an excellent opportunity for safety-minded individuals to meet in an informal session to share information and discuss concerns about safety and health programs.  This forum will consist of a tour of the Waste Water Treatment Facility and a discussion period.

Participants who have safety glasses should bring them along; hearing impact is minimal, so hearing protection isn't required.  If there are some in the group that prefer hearing protection, the Waste Water Treatment Facility does have that available on site.  All participants MUST wear sturdy walking shoes as there are steps and grating to walk over in many areas.
 

The Manitowoc Wastewater Treatment Facility was originally built in 1940 for $980,000. This was a primary treatment plant consisting of primary settling tanks, a primary digester, a secondary digester and sand drying beds. Primary treatment plants typically remove 25-35% of the BOD and 40-60% of the suspended solids. BOD and suspended solids are two measures of the strength of the sewage. There were three subsequent upgrades to the original plant. 

The first upgrade was in 1959 at a cost of $1,430,000. The major changes were the addition of high rate trickling filters, secondary sludge pumping and final settling tanks. This increased the capacity of the treatment plant and added secondary treatment to improve treatment and reduce pollution. Typical secondary treatment removes 85-90% of BOD and 85% of suspended solids. 

The second major upgrade was finished in 1976 at a cost of $19,500,000. This project increased the overall capacity of the plant, improved the secondary treatment process, added more final settling tanks, and added a tertiary filter process to remove fine particles. In addition, phosphorus removal was also added to the treatment process. 

The third upgrade was finished in 2001 at a cost of $20,300,000. Three previous structures were removed and replaced with a new building that incorporated the processes from these buildings. Improvements were made in the digester mixing, stack filter drives, rock filter pumping and sand filter operations. Belt presses were added to provide for flexibility in disposal of biosolids. Computerization of the treatment plant was a major component of the plant upgrade. 

Manitowoc has a separated sewer system. This means storm water is not combined with the sanitary sewage. All sanitary sewage from residences, commercial establishments and industry as well as industrial waste are treated at the plant. The treatment plant processes an average of 9.0 million gallons per day. Approximately 40% of this flow comes from Manitowoc’s industrial base.