|Bergen County Utilities Authority
The Bergen County Utilities Authority ("BCUA") is a secondary
biological wastewater treatment plant with a current process
design capacity of 109 MGD located in Little Ferry, New Jersey.
The facility has five (5) anaerobic digesters for the primary and
secondary sludge. These digesters produce one (1) million
scfd of biogas (digester gas). In addition to the digesters, there
is a sludge storage tank, which produces approximately
127,000 scfd of additional biogas.
Metro Energy completed the preliminary and conceptual design
for the cogeneration plant, assisted the BCUA through a RFP
process in selecting a contractor and oversaw the installation of
the plant as the construction manager for the BCUA.
Metro Energy Solutions evaluated a number of different options
for a cogeneration installation for the plant utilizing excess
biogas to generate electricity to offset power that is currently
purchased to operate the facility. Electric power usage at the
facility averages 3200 kW. Based on the electric and thermal
loads at the site and the amount of biogas available, Metro
Energy analysis provided for the installation of two engine
generator sets, each rated at 1500 kW. The engines operate
primarily on biogas. Natural gas is used as a supplementary
fuel since the supply of biogas is insufficient to meet all of the
needs of the plant. Maximum recovery is made of the waste
heat from the engines. The new cogeneration plant operates in
parallel with the local utility grid which in addition to energy
savings provides a more reliable source of power.
The cogeneration plant will save approximately $26 million over
the course of running the plant for 25 years. The plant was
commissioned in June 2008 and is currently providing electric
and thermal energy to the waste water treatment plant.
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