City of Grand Junction Persigo Wastewater Treatment Plant Mesa County, CO

FACT SHEET

• Development of small scale biogas-based fuel process to power CNG vehicles

• Pipeline engineering and construction

• BioCNG system construction

• CNG station modification and integration

• WWTP integration

• Permitting

• System startup

• System operation and management assistance

BioCNG, LLC, an affiliate of Cornerstone Environmental Group, is the design/build firm installing a BioCNG™ biogas conditioning system and gas pipeline for the Persigo wastewater treatment plant (WWTP).

The WWTP is jointly owned by the City of Grand Junction and Mesa County, CO. BioCNG is engineering the system, providing permitting, construction management, and sys-tem commissioning and start up. Additional work includes design and installation of an option to preferentially use BioCNG in the WWTP digester boiler instead of natural gas, thereby saving on treatment plant operating costs.

The BioCNG system will produce up to 500 gallons of gaso-line equivalent per day from the WWTP digester gas, which will be piped about 6 miles to Grand Junction’s existing compressed natural gas (CNG) fueling station. The BioCNG will be used as fuel for a fleet of buses owned by Grand Valley Transit (GVT) and fueled at the City of Grand Junction facility, as well as City refuse trucks, street sweepers, and general utility pickups. The City of Grand Junction and GVT continue to purchase additional CNG vehicles to increase the overall CNG fleet.

For more information:630.410.7202 biocnginfo@biocng.us

Key Project Activities

Project Manager: Steve Wittmann

Client Contact

Dan TonelloTel # 970.256.4171

Start/End Date: July 2013 - April 2015

Biogas Source Persigo WWTP

Size 7.4 MMGPD Influent

Gas Collected 80-100 scfm

Gas Quality Methane (CH4) – 60%

Flare Waste gas and BioCNG unit downtime

Other Gas Use BioCNG used as substitute for boiler fuel

Available Gas for CNG 80-100 scfm

Size of BioCNG Unit BioCNG 100

Components H2S removal, chilling, VOC/Si-loxane removal, CO2 removal; 6 mile dedicated BioCNG pipe-line; connection to existing natural gas fueling station for additional capacity

Fueling Unit Existing time fill and fast fill fueling station

Start-Up Date April 2015

Fuel Production (GGE) Up to 500 GGE/day

Waste Gases Flare

Back up for CNG Fueling Natural gas

Fleet Size/Type City public works vehicles, refuse trucks and county bus fleet28 with plans to add 10 by end of 2015

Additional Users Outside users at fast fill station

Specifications

BioCNG Sizing and Cost Information

System Size

BioCNG 50

BioCNG 100

BioCNG 200

Biogas Inlet Flow (scfm)

5050

100

200

Budget Price

($million)

1.2

1.5

2

Typical Fuel Production (GGE/day)

200-300

375-600

775-1200

O&M Estimate ($/GGE)

Estimated Fuel Production Cost

without RINS

1 Fueling station options available from BioCNG at additional cost.2 Grants, subsidies, tax credits not included3 Assumes 10 year depreciation4 BioCNG is qualified to receive D3 and D5 Renewable Fuel Standard Credits. Financial impact will depend on the project-specific operating scenario, and can be up to $1.20 per/GGE5 Does not include road tax6 Assume 60% methane

Fueling Station

0.74

0.59

0.96

Without Fueling Station

0.61

0.44

0.31

Fueling Station

2.16

1.40

0.98

Without Fueling Station

1.42

0.92

0.60