Wastewater treatment advances spur growth of renewable energy market

Sponsored by

SEATTLE, WA, Sept. 27, 2012 -- The Chambers Creek Regional Wastewater Facility in Pierce County, WA, represents an emerging trend in the renewable energy market: transforming waste into energy. Wastewater treatment plants (WWTPs) are increasingly recognized as community resources for electricity, fertilizer, and heat, as waste to energy projects become commonplace in a sustainable economy.

A national leader in renewable energy and water/wastewater construction, Mortenson Construction is handling the expansion of the Chambers Creek Regional Wastewater Facility to increase its production of digested methane gas, which is one of the most effective and efficient ways for new or upgraded WWTPs to generate energy for surrounding communities.

The expansion adds two anaerobic digesters (for a total of five) and new digester gas-fueled steam boilers to heat the plant -- thereby substantially reducing the reliance on external energy sources. The energy produced at Chambers Creek will be used to heat the plant year round and create 40 dry tons of fertilizer a week.

"We strongly believe that the transformation of waste into energy is a huge opportunity that will transform the renewable energy market and have a positive impact on communities," said Jim Yowan, Vice President, Mortenson Construction. "Wastewater is a continuous source of energy that will only increase over time. Many of the technologies which are needed to transform waste to energy exist today. Now is the time to tap into this underutilized resource."

According to the Water Environment Research Foundation, wastewater contains up to ten times the energy needed to treat it -- providing a network of distributed, decentralized energy sources which are already constructed and piped.

WWTPs are currently responsible for approximately 1.5-percent of total U.S. energy consumption. For some municipalities, this translates to 30 to 40-percent of the total electricity bill. Since the need for wastewater treatment will only increase with population growth, closing the energy loop is rapidly becoming a primary focus of many municipalities.

Some newer WWTPs are even net energy-positive, producing enough power through a combination of microbial activity, efficiency improvements, and mechanical modifications to offset the energy needed to operate. For example, a WWTP in Sheboygan, Wis. produces more energy than it needs to operate through a series of biogas-fueled micro-turbines and the implementation of a co-digestion program.

WWTPs can be sources of hydropower, capturing and redistributing the energy produced as water circulates throughout a plant. Some cities currently utilize the heat in wastewater much like a geothermal heat pump, resulting in billions of bulk gallons that are cool in the summer and warm in the winter.

Expansion of the Chambers Creek Regional Wastewater Facility is scheduled to be complete in the spring of 2016.

About Mortenson Construction
Founded in 1954, Mortenson Construction is a U.S.-based, privately-held construction company. As one of the nation's top builders, Mortenson provides a complete range of services, including planning, program management, preconstruction, general contracting, construction management, design-build, and development. Mortenson has offices in Chicago, Denver, Milwaukee, Minneapolis, Phoenix, and Seattle with international operations in Canada and China. For more information, visit mortenson.com.

###

Sponsored by

TODAY'S HEADLINES

Local CA agencies join national water campaign to promote water consumption

First Lady Michelle Obama and the Partnership for a Healthier America announced that FIRST 5 Santa Clara County and the Santa Clara Valley Water District joined the Drink Up effort, a national campaign that encourages people across the country to drink more water, more often.

New treatment technology to be added to WWTP at NY Superfund site

EPA has announced that an additional treatment technology will be added to the existing treatment plant at the Dewey Loeffel Landfill Superfund site in Nassau, Rensselaer County, New York.

EPA grants over $11M to Oklahoma to improve water quality

EPA recently awarded over $11 million to the Oklahoma Water Resources Board as part of its Clean Water State Revolving Fund, a program that provides low-interest, flexible loans to communities to help them improve water quality and infrastructure.

Private water companies to bridge $500B water investment gap in U.S., finds study

According to a new report from Bluefield Research, private water markets in the U.S. are poised for significant growth. With an infrastructure investment gap of more than $500B for drinking water and wastewater treatment over the next 20 years, a revised regulatory landscape is shaping new opportunities for private players looking to invest strategically in U.S. water.

FOLLOW US ON SOCIAL MEDIA