Site Plan Review No. 22-06 (Flint Dairy)

Site Plan Review No. 22-06 (Flint Dairy)

The applicant is proposing the installation and operation of an on-site anaerobic digester system and an aerobic wastewater treatment system which are incidental to an existing dairy facility, Flint Dairy, located at 6511 Flint Avenue, Hanford, Assessor’s Parcel Numbers: 014-090-036. The gas produced by the proposed anaerobic digester will either be; cleaned onsite using gas upgrading equipment and trucked offsite daily, connected via underground pipeline to a common biogas upgrading facility that services a cluster of dairies, connected to a utility grid natural gas pipeline for injection, or utilized onsite to generate electricity through the use of a generator such that the electricity produced can be sold and delivered through the existing electrical grid. The digestion system would be installed within the existing dairy footprint and will digest cow manure produced at the dairy. Process combinations for the digestion systems may include up to four (4) unique anaerobic digester tanks. All combinations will also include the construction of one (1) equalization tank, up to two (2) sludge storage tanks, miscellaneous ancillary equipment, a proposed gas upgrading area, and a proposed truck loading area. All options may also include the construction of up to two (2) aerobic digester tanks, an algae raceway for wastewater treatment, up to two (2) emergency flares and up to four (4) gas-fired process heaters. SJVAPCD permits will be procured for all necessary permit units. The phased aerobic wastewater treatment system operation is an aerobic system which processes the effluent after the anaerobic digestion system. When the effluent is cycled out of the anaerobic digestion it flows into the aerobic reactor to be oxygenated and aerobically digested. In the process, this reduces the nitrogen concentration of the water. In the future, salt treatment and removal equipment may be installed, with provisions to export the brine to an approved disposal facility via pipeline or truck. The digester tanks may be heated to optimize efficiency. One to three (1 to 3) trucks per week of fuel gas may be brought in for heating purposes. The facility will operate 24 hours per day, 7 days per week. Most of the time, it will be remotely monitored. During the initial startup period and during maintenance operations, there may be 2-3 onsite employees, mostly during the daytime.

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