For free technical consultation contact MnTAP, at the University of MN. For financing options contact Bill Dunn at the MPCA, who can explain, among other funding, the Green Project Reserve funding from the MPCA for projects that reduce the environmental footprint of water and wastewater treatment, collection, and distribution, that help utilities adapt to climate change, enhance water and energy conservation, adopt more sustainable solutions to wet weather flows, and promote innovative approaches to water management problems.
Guidelines for Water Reuse (US EPA: 2012) covers water reclamation and reuse, planning for future water reuse systems, and information on indirect potable reuse and industrial reuse. Disinfection and treatment technologies, emerging contaminants, and public involvement and acceptance are also discussed.
See Characterization of CHP Opportunities at U.S. Wastewater Treatment Plants (U.S. DOE: 2019) to learn about combined heat and power systems fueled by biogas from anaerobic digestion at WWTPs. As of October 2012, 62 publicly owned treatment plants in MN had anerobic digestion in place. For small-medium WWTPs in MN, the simple payback for installing CHP is 4-10 years.
See, for example, a 2012 industrial biogas project at Liberty Paper in which the City of Becker is a partner. A pretreatment facility at the Liberty paper mill will allow water to be pretreated on-site and methane captured and burned for in-plant energy use before the water is routed to the city's wastewater treatment plant.
Assist local businesses and institutions with water conservation measures; assist businesses in pre-treating and lowering volumes and toxicity of sewer inflows.
Reuse water (sell reclaimed water) from a wastewater plant for nonpotable ag-processing, irrigation, cooling or power plant uses; require businesses to take steps to keep grease out of sewer lines.
Co-generate electricity and heat through anaerobic digestion at the wastewater treatment plant; comp plan/zoning that guides businesses using high volumes of non-potable water to within 2-5 miles of a waste water treatment plant.
Who's doing it
Albert Lea - 3 star
Date action report first entered:
Date of last report update:
Year action initially completed:
At the 6.7 MGD Waste Water Treatment facility, Albert Lea has operated a 120 kW on-site methane fired electric generation system since 2003.
WWTP has been using biogas from the industrial digeters to recover heat for heating of return sludge for many years.
Hormel Foods Corporate Office is using greywater in restrooms in the office expansion that was completed in February. -Methane gas is generated through the digesters and then is captured and is used as the fuel source for the boilers. The boilers heat the waste flow to optimize the biological process. The City operates two treatment plants and this process is used for both. At certain times the organic loading is not sufficient to produce enough biogas for the operation of the domestic plant and if possible we will divert flow from the industrial plant to try and supplement the loading thus increasing our gas production. This process provides for significant reductions in our needs for natural gas.
Rochester has 2 main co-generator plants that supply a majority of the city. Franklin Heating Station, primarily serves Mayo Clinic, while Rochester Public Utilities is a more comprehensive supplier for the city.
The Energy Efficiency and Biofuel Recovery Project started construction in June 2016 and is at substantial completion.The project consisted of installation of energy efficient and biofuel recovery equipment.
Outcome measures/metrics/money saved:
The facility can generate on average 80% of its electrical demand onsite through solar or biofuel. There are days when the facility produces more energy than it needs.
The City of Detroit Lakes is currently constructing a new $35M wastewater treatment plant. This sizable investment for a community of our size will enable us to produce high quality discharge water to preserve water quality in a vast region of Western Minnesota. Our facility will help preserve water quality, excellent recreational activities, and protect downstream watersheds for years to come.
Upgrades the city has been making to Mankato's water treatment plant are designed to conserve energy and minimize costs by drawing more water from surface wells that have high-capacity output with low maintenance.
The city's water reclamation facility continues to provide advanced wastewater treatment, similar to a drinking water plant.
Organic byproducts of the wastewater treatment process are made available to area farmers for use as fertilizer. The City maintains certification with the National Biosolids Partnership for effective and efficient handling of biosolids in this land application program.
A new station was built in 2011 that includes a fill station where trucks can fill their tanks with City reclaimed water from the wastewater treatment lant. City employees use this water for street sweeping, sod establishment, and pipe testing, and the City is also planning to sell this water to those who have purchased drinking water in the past for such purposes.
Outcome measures/metrics/money saved:
Mankato's surface water well has reduced the city's use of water from deep wells (tapping the Mount Simon aquifer) by about 50 percent.
Between 1.5 and 2 million gallons of treated wastewater is being used by the Mankato Energy Center for cooling, which saves the city nearly 700 million gallons of water annually and has significantly reduced phosphorous levels.
The City used 1.2 million gallons of reclaimed Title 22 water in 2011 to irrigate the new Riverfront Park.
A grease waste reduction project commenced in September 2013 to reduce the amounts of fats, oils and greases entering the Wastewater Treatment facility by 10%. Baseline measurements of FOG were taken and compared with years prior and a collaborative education initiative is underway to educate restaurants and commercial kitchen operators about best management practices for FOG waste. The first of many conversations about this topic occurred on April 23rd at a public presentation entitled, "Grease Waste in Bemidji: Cleaning Up the Headwaters."
. The City’s tiered water rate structure is in place to help encourage efficient water use. The water and wastewater rates are in City Code and can be found here:
The City’s current water conservation measures is through ordinances that restrict lawn watering to odd-even cycle from May through September. The upcoming Utility Rate Study will provide an opportunity to explore other areas of potential advancement on this topic.