The City of New Hampton operates a Wastewater Treatment Facility (WWTF) designed to treat municipal waste water. The effluent is collected through a series of pipes totaling approximately 30 miles and has four lift stations.
The current wastewater treatment plant was constructed in the mid-1960s as a trickling filter wastewater treatment facility. The 1963 construction took an existing site with sludge drying beds and constructed the trickling filter facility with grit removal, primarily clarification, a trickling filter, final clarification, a sludge digester and sludge drying beds.
IN 1973, a second digester, a clariflotator clarifier for industrial wastewater, and an intermediate clarifier were added to the wastewater treatment plant. A new final clarifier was constructed and the original final clarifier was converted into a second intermediate clarifier. Two new trickling filters were constructed, converting the original trickling filter into a roughing filter. Two polishing ponds were also installed.
In 1989, a second final clarifier was constructed along with a new primary sludge pump station. In 1991, one of the existing sludge drying beds was abandoned and a sludge storage tank was constructed.
In 1998, the polishing pond No. 2 was converted into an equalization pond. The drains, media and distributors were replaced in both trickling filters. A new primary clarifier was constructed and the existing primary clarifier was converted into a sludge thickener. Repairs were made to the intermediate clarifier No. 1. A new influent structure with a flume and an overflow weir was constructed, along with a new flow equalization return pump station. Finally, the last existing sludge drying bed was abandoned and a new office and lab were constructed on its location.
The last improvement project on the facility was constructed in 2008. It included a new grinder pump and a new electrical room in the influent raw pump station. It also included new pumping stations at the intermediate clarifiers, final clarifiers and roughing filters.
The wastewater treatment plant was designed with the following design parameters:
|Average Dry Weather Flow (ADW)||1.32 mgd|
|Average Wet Weather Flow (AWW)||2.20 mgd|
|Maximum Wet Weather Flow (MWW)||3.00 mgd|
|Biological Loading – BOD5||12,300 lbs./day|
|Total Kjeldahl Nitrogen (TKN) Loading||362 lbs./day|
Flow in excess of the MWW Flow of 3.00 mgd is sent to the equalization pond until it can be pumped back through the treatment facility.
The average daily flow at the wastewater treatment plant is in the original design range of 1.32 mgd to 2.20 mgd.