The Facility

The ZWEDC AD Facility is the largest dry fermentation anaerobic digestion project in the world and was designed and constructed to meet the stringent standards for LEED Gold Certification. The ZWEDC AD Facility is a fully enclosed and ventilated organic waste processing and renewable power generation facility. Up to 90,000 tons per year of organic waste (250 tons-per-day) is produced.  The facility consists of 16 Anaerobic Digestion Tunnels, 4 In-vessel Composting Tunnels, and 2 x 800 kW combined heat & power supply units that provides the electricity production.

Material Processed
The Facility processes the City of San José’s Commercial Organic Waste through a 15-year exclusive Organics Processing Agreement with the City of San José.  The organic material includes pre- and post-consumer source separated food waste, residuals from processing wet and dry materials and yard waste. The facility accepts source-separated food waste from commercial accounts in Palo Alto and residential food waste mixed with yard trimmings from Palo Alto.

Each of the three phases will produce

  1. Power (gross electrical generating 1,600 kW or 13,363,497 kWh-per-year); and
  2. Feedstock from compost (30,000 tons per year)

Energy Use
The Facility generates and runs on 100% clean, renewable energy, providing surplus power to PG&E for distribution to the grid.

Technology Details
The ZWEDC Facility uses Eggersmann Anlagenbau’s patented Kompoferm high solids dry anaerobic digestion and IVC Plus in-vessel composting technologies, exclusively licensed to and provided by Zero Waste Energy, LLC.