ACEC Awards Tighe & Bond for Plant Upgrade with Innovative Siemens BioMag® and CoMag® Water Treatmen

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ACEC Awards Tighe & Bond for Plant Upgrade with Innovative Siemens BioMag® and CoMag® Water Treatment Systems

  • Tighe & Bond receives ACEC Gold Award for its work with Siemens Water Technologies at Sturbridge, MA municipal wastewater plant
  • Siemens BioMag and CoMag Systems, a cost-effective alternative to MBR and conventional media filtration, exceed all expectations for expanding treatment capacity and enhanced nutrient removal

ALPHARETTA, Ga.--(BUSINESS WIRE)-- The American Council of Engineering Companies (ACEC) of Massachusetts has awarded Tighe & Bond its prestigious Gold Award for its work at the Town of Sturbridge, MA wastewater treatment plant using an innovative combination of Siemens Water TechnologiesBioMag® and CoMag® Systems.

The ACEC recognized the engineering firm for having demonstrated "the highest degree of merit, ingenuity, complexity and client satisfaction," according to Treatment Plant Operator Magazine. The implementation of Siemens BioMag and CoMagwater treatment systems "increased wastewater treatment efficiency, improved water quality and reduced costs and overall environmental impact."

"We are honored to receive this professional recognition and to have exceeded, performance and compliance requirements for the Town while delivering the project substantially below the estimated cost of a conventional treatment system," said Ian Catlow, Tighe & Bond senior project manager. "The outcome is a result of a great collaboration between Tighe & Bond, the Town of Sturbridge and Siemens."

Sturbridge originally planned to install a membrane bioreactor (MBR) to meet the need for additional wastewater treatment capacity in a highly constricted footprint, coupled with tighter permit limits for biochemical oxygen demand (BOD), total suspended solids (TSS), total nitrogen and phosphorus. However, after evaluating the high capital and operating costs of the MBR, the town and Tighe & Bond agreed to pilot test the Siemens BioMag System. By using magnetite to ballast biological floc, allowing an increase in mixed liquor concentration as high as 12,000 mg/l, the BioMag system proved to be a cost-effective alternative to MBR technology while expanding capacity from 2.84 MLD (0.75 MGD) to 6.06 MLD (1.62 MGD).

Next, to comply with anticipated lower phosphorus discharge limits and a desire for a reliable tertiary treatment process to follow the BioMag System, the Town and Tighe & Bond initially planned to expand its conventional media filtration system. Once again, after a demonstration proved that the installed cost of the larger sand filter would be greater than the smaller and higher performing CoMag System, the town chose the Siemens solution. Since implementing the CoMag System, the plant has experienced no loss of productivity due to clogging, plugging or backwashing and the Town received a process guarantee providing <0.05 mg/L of effluent phosphorus.

For more information about Tighe & Bond's work for the Town of Sturbridge, read the complete case study. To learn more about the BioMag and CoMag Systems and other proven and innovative solutions, visit Siemens Water Technologies at Water Environmental Federation Technical Exhibition and Conference (WEFTEC) booth 1431 Oct. 7-9 in the McCormick Convention Center in Chicago and attend the technical session "The Impact of Magnetite Ballast on Oxygen Transfer and Alpha" presented by Siemens Senior Process Engineer Mike Doyle on 8:30-10:00 a.m. Wednesday, Oct. 9 in room S402b. For immediate BioMag and CoMag Systems product queries, contact Sales Director Betty-Ann Curtis at or call (262) 521-8408.

About the American Council of Engineering Companies (ACEC)

The American Council of Engineering Companies (ACEC) is the voice of America's engineering industry. Council members - numbering more than 5,000 firms representing more than 500,000 employees throughout the country - are engaged in a wide range of engineering works that propel the nation's economy, and enhance and safeguard America's quality of life. These works allow Americans to drink clean water, enjoy a healthy life, take advantage of new technologies, and travel safely and efficiently. The Council's mission is to contribute to America's prosperity and welfare by advancing the business interests of member firms.

ACEC's roots date back to 1909 when a small group of engineers in private practice established the American Institute of Consulting Engineers (AICE), the forerunner of ACEC. Today ACEC is a large federation of 51 state and regional councils representing the great breadth of America's engineering industry. ACEC member firms employ hundreds of thousands of engineers, architects, land surveyors, scientists, and other specialists, responsible for more than $200 billion of private and public works annually. Member firms range in size from a single registered professional engineer to corporations employing thousands of professionals.

About Tighe & Bond

Founded in 1911, Tighe & Bond has continued to grow in size and stature with a solid reputation for excellence and recognition as one of the most experienced engineering firms in the Northeast.

What began as a broad-based civil engineering firm specializing in water resources, bridges and roadways has continued to evolve in response to the changing needs of clients in a changing environment. We now also specialize in various aspects of environmental engineering — such as water, wastewater, solid waste and stormwater management. Our experience ranges from consulting on limited projects for small businesses to designing two of the largest wastewater residuals drying facilities in the world.

The Siemens Industry Sector (Erlangen, Germany) is the world's leading supplier of innovative and environmentally friendly products and solutions for industrial customers. With end-to-end automation technology and industrial software, solid vertical-market expertise, and technology-based services, the Sector enhances its customers' productivity, efficiency, and flexibility. With a global workforce of more than 100,000 employees, the Industry Sector comprises the Division's Industry Automation, Drive Technologies and Customer Services as well as the Business Unit Metals Technologies. For more information, visit

BioMag and CoMag are trademarks of Siemens, its subsidiaries or affiliates in some countries

Contact for journalists:
Siemens Water Technologies, Corporate Communications
John Deaver, +1 404-937-1562
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KEYWORDS:   United States  North America  Georgia  Massachusetts


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