Posted: Thursday, June 29, 2017 12:00 am
Last week the Dublin San Ramon Services District (DSRSD) Board of Directors awarded a $7.8 million contract to GSE Construction Company to build a fourth anaerobic digester and a receiving station for fats, oils, and grease at the DSRSD Regional Wastewater Treatment Facility in Pleasanton. In addition, the DSRSD Board authorized $473,000 for engineering services during construction by Carollo Engineers and $496,000 for construction management by The Covello Group.
Anaerobic digesters work like mechanical stomachs, providing an ideal environment for bacteria to decompose the organic solids in wastewater and destroy pathogens. The process produces biogas, a renewable fuel that DSRSD captures and uses to generate electricity and heat for treatment plant operations. DSRSD needs an additional digester to handle growth in its customer base and provide enough redundant capacity to take a digester offline for cleaning and maintenance.
The receiving station will provide a local, environmentally responsible disposal option for companies that pick up grease trap waste from restaurants. The concentrated grease helps digester bacteria break down solids more efficiently and produce more biogas. The receiving station also will generate tipping fee revenue, which DSRSD will use to offset operating costs.
Construction starts in August and will take a year to complete. The project’s total cost, including design, is budgeted at $13.1 million. Fees collected from developers for infrastructure expansion are funding about 90 percent of the cost.
Thursday, June 29, 2017 12:00 am.