Detailed project View

Galt Wastewater Treatment Plant (WWTP)

Project Website

Website Link

Plant Owner

City of Cambridge

Under a Tender

NO

Project Location

Cambridge, Canada

Type Of System

Municipal

Year Of Operation

2008

Digester Type

Wet

Biogas Usage

Boiler

Estimated biogas volume

1 500 000 m³/yr

Notes

The anaerobic digesters in the existing WWTP produce 3,500 and 5,000 cubic metres (m3 ) of biogas daily. Currently this biogas is burned by boilers for digester heating and building heating, with excess biogas being flared. The proposed installation will intercept the gas flow to the boilers and flare and redirect it to a reciprocating engine generator. There is sufficient biogas to run a 400kW to Project Description Report 3 Riepma Consultants Inc. 600kW engine depending on seasonal variations and gas storage configuration. The gas flowrate will be regulated by a low-pressure storage membrane having a capacity of approximately 1,000 m3 . Should the digester produce more gas than the engine can use and the gas storage membrane can contain, the surplus gas will be directed to the boilers or existing flare. Flaring will be significantly reduced as a result of the installation. The power produced by the generator will be consumed within the WWTP, thereby offsetting power purchases to operate the plant. No power will be exported from the site. The heat produced by the engine will be used to heat incoming sludge to the digesters. It is estimated that electrical energy usage at the site will be reduced by 33%. Biogas is currently used for building heating and sludge heating during winter months. In order to compensate for the redirection of biogas from the boilers to the Cogeneration Facility, the natural gas consumption will increase at the WWTP by 50%.