미국 아이다호주의 렉스버그(Rexburg)시가 시의 폐수처리시설에서 바이오 고형물을 처리하기 위한 기술로 GE의 Monsal 고도 혐기성 소화기술(advanced anaerobic digestion technologies)을 선정했다.

아이다호 폭포에서 북동쪽으로 28마일 떨어져 있는 렉스버그시는 환경보호청(EPA)의 슬러치 처리 기준을 준수하기 위해 매립처리 전에 폐수처리 플랜트에서 발생한 슬러지를 처리하고자 새 솔루션이 필요한 상황이다.

이 기술은 영국 기반의 상수·폐수·고도 혐기성 소화 및 통합 바이오가스 에너지 사업으로, 이번 프로젝트는 GE가 2014년 7월 Monsal 사업을 인수한 이래 북아메리카 최초의 Monsal 기술 적용 사례이다.

 

 

 

The city of Rexburg, Idaho, has selected the GE’s Monsal advanced anaerobic digestion technologies to treat biosolids at the city’s wastewater treatment facility.

 

Located 28 miles northeast of Idaho Falls, the city of Rexburg needed a new solution to treat sludge from the wastewater treatment plant prior to landfill disposal in order to ensure it complied with the Environmental Protection Agency (EPA) sludge disposal standards.

 

The project represents the first North American application of the Monsal technologies, a private UK-based water, waste, advanced anaerobic digestion and integrated biogas-to-energy business, after GE acquired the business in July 2014.

 

An aanaerobic digestion process will be used to treat biosolids and GE’s Monsal 70 system will pasteurize the sludge, creating “Class A” biosolids for disposal.

 

The EPA governs biosolids under the Part 503 rule. Biosolids that have gone through an accredited process, defined in 40 CFR Part 503 for pathogen reduction, are deemed to be “Class A”. With this classification, no land application restrictions exist.

 

Biogas generated from the anaerobic digestion process will be used to fuel the pasteurization boilers. A heat recovery system is being installed to capture and convert the biogas to heat, with a separate contractor set to supply the building and installation of the piping and ancillary systems.

 

Aqua Engineering, the design engineer on the project, worked closely with the city of Rexburg and GE to fit the technology into the existing footprint of the city’s wastewater treatment plant.

 

GE is scheduled to deliver its equipment by fall 2015, and the digestion system is expected to begin operating in late 2015.

 

[출처 = Water World / 2015년 6월 9일]