SU0015706 - Laserfiche WebLink

Home Browse Search

February i, aoay I H H A R T MA N E N G I N E E R I N G San Joaquin County Community Development Department 181 O E. Hazelton Ave Stockton, CA 95205 RE: Anaerobic Digester for DDS D19ester at Da Silva North Ranch, 23335 E Dodds Rd, Esoalon, CA 96320 To Whom It May Concern, Tha following application is for an anaerobic digester system and associated equipment by the developer Sierra Renewables Organics Management, LLC (SROM). SROM has permitted two other"cluster' digester sites, DB and VS Digesters, that are very similar to this project. The facility will be on approximately 1 O acres of existing cropland. There are no structures that will Head to ba demolished for this construction. The area is in FEMA Flood Zone Designation X, outside of the 02%Annual Chance Flood Hazard Area. Tha dairy uses a flush system to clean manure from their barns. The flush effluent goes to a sand recovery system. Tha flushed manure will then be pumped to the sloped screens in order to generate bedding for use on the dairy. Supernatant from the sloped screens will be pumped to a process pit at the AD site. A portion of the supernatant will be used for dilution purposes. The remainder will ba processed through an additional process slap where solids will ba concentrated prior to being pumped to the hydrolyzar. In order to meat the target biogas production, solid manure will be trucked in from donor farms. Tha solid content is anticipated to be 35% upon delivery. Solid manure will be received at the live bottom receiving hoppers (50 cu.yds. each). From the live bottom hoppers, the manure will be conveyed to the injection screw mounted on the hydrolyzar. The digester will have 2 stages: the Frst in a concrete, oval-shaped hydrolyzar;the second in an in-ground, Tiar 1double-lined, covered lagoon. There is a 1 O-foot"hazardous zone"around the digester within which open ignition sources cannot ba permanently situated. As a result, system components using exhaust stacks are at least 15 feet from the exterior of the anaerobic d igastar. Thasa structures are shown on the attached site map. Following digestion, digestate is pumped to a storage lagoon on the farm to ba land-applied agronomically. Biogas is continuously produced in the AD lagoon and is collected around the perimeter of the lagoon where it is continuously drawn off to the biogas upgrading system. Tha biogas is pr�- treated to ensure hydrogen sulfide (H2S) levels In the biogas era suitable for use in the biogas upgradar where carbon dioxide and methane era separated. The methane stream (now RNG) is then sent to an on-site compression system and subsequently Into the natural gas pipeline at a natural gas injection point a few miles from the dairy. Tha biogas upgradar, compression system, gas pipeline, and injection station era designed and supplied By Others. The PSA biogas upgrader processes biogas to produce pipeline-quality RNG. Off-specification RNG is retliractad to the digester headspace and re-processed through the biogas upgrader.