For the second phase of the Digester Upgrade project for East Bay Municipal Utility District’s Main Wastewater Treatment Plant, the scope of work included replaced floating covers with fixed covers; installed internal draft tube mixers; designed a new trucked waste receiving station and blend tanks; and coated the interior walls and roof. The benefits included: improved digester operations; improved biogas production; and expanded resource recovery capability.
Beyaz & Patel provided structural engineering services for the Phase 2 digester project, including:
- Preliminary design evaluation and technical memo for the new fixed steel roof covers on digesters 3, 4, 5, 7 and 8.
- Preliminary design evaluation and technical memo for the seismic retrofit of digesters 2, 3, and 4, which involves connecting the wall of the digester to the base slab internally.
- Preliminary design and technical memos for a new 40-foot-diameter by 30-foot-high, 250,000-gallon sludge blending tank with a roof, on new pile foundations and a new pad and enclosure for the new gas flare facility.
- Detailed final design of digesters 2-8; also included is the design of 36-inch tank wall penetrations and modifications to external mixers at digesters 2 and 12, and new 12 to 14 inch diameter feed pipe penetrations at digesters 5 and 7.
- Detailed final design of several structural modifications to the mixed liquor channel, secondary clarifier feed channels, primary effluent channel, and modifications to the scum skimming equipment and new outlets/overflows into the channels is also included.