[미국] 녹색 열회수 시스템, 미시건 오수처리공장 난방료 절감

새 녹색 난방 리커버리 시스템이 최근 미시건 주 오클랜드 타운쉽과 디트로이트 교외에 있는 상업적 성격 거주지역의 오수처리공장에 설치됐다고 밝혔다. 이 시스템은 겨울에 거주지역에 발생하는 난방료를 5만 달러 정도 줄일 수 있을 것으로 기대된다.

시스템은 타운쉽 컨설턴팅 엔지니어링 회사인 Giffels Websterm에 의해 개발됐으며, 열회수시스템은 2014년 2월에서 3월까지 모든 하수의 WWTP에서 쓰이는 열의 상당한 양을 지원했다.

Giffels Webster는 올해 초 WWTP의 시스템을 설계하고 도안하기 위해 오클랜드의 수자원 의원 사무실과 함께 협력했다. 또한 Giffels Webster는 타운쉽의 2012년 WWTP확장 프로젝트를 이끌으며, WWTP의 처리능력이 하루 2백4십만 갤런에서 하루 8백5십만 갤런으로 늘어났다.

A new green heat recovery system recently installed at the wastewater treatment plant (WWTP) in Commerce Charter Township, a charter township of Oakland County and suburb of Detroit, Mich., is expected to save the township $50,000 in heating costs this winter.

Developed by Giffels Websterm, the township's consulting engineering firm, the heat-recovery system supplied a significant portion of the heat required at the WWTP -- all from sewage -- from January to March 2014.

Giffels Webster worked with the Oakland County Water Resources Commissioner's office to design and engineer the system at the WWTP earlier this year. Likewise, Giffels Webster also led the township's WWTP expansion project in 2012, which increased its capacity from 2.4 million gallons per day (GPD) to 8.5 million GPD.

The heat recovery system works similarly to geothermal energy by capturing heat from treated wastewater, which at the surface has a constant temperature of approximately 55 degrees. According to Loren Crandell, Giffels Webster partner, the system is cost-effective, reliable, sustainable, and environmentally friendly, and requires no wells.

Commerce Township's WWTP is Michigan's first municipal facility to draw thermal heat from wastewater. Crandell said it can also be used as a local utility by pumping treated wastewater to local businesses and residents that install heat recovery systems.

Although Commerce Township only uses the thermal extraction process for heating, the system is also capable of generating energy for cooling, yielding even more savings. It also helps the township diversify its portfolio of energy sources and reduces its reliance on commercial energy providers.

In 2013, the Commerce Township WWTP received the "Peak Performance Platinum 9 Award" from the National Association of Clean Water Agencies (NACWA) for achieving 100-percent compliance for six or more consecutive years.

[출처 = Water World / 2014년 9월 3일]