Mariani Packing Co. WWTP

GSE and Siemens Water Technologies (now Evoqua) partnered to design, procure, install, and commission a new anaerobic and aerobic pretreatment system. Mariani needed a new WWTP due to Gibson Canyon Creek WTP shutting down. With limited choices, Mariani either had to build its own on-site wastewater treatment system or pay a connection fee to the City of Vacaville, which would cost tens of millions of dollars over time in monthly surcharges. Ultimately, Mariani decided to move forward with its own on-site wastewater treatment system. The system included multiple different technologies for reducing Biological Oxygen Demand (BOD) and suspended solids (TSS) of its high-strength process wastewater. The greenfield facility included a Bio Pac IC High-Rate Anaerobic Reactor, influent/effluent pump station, primary and secondary clarifiers, heat exchanger, aeration basin, sludge tank, belt filter press, Varec Enclosed Flare, and a Zabocs Odor Control Unit. Ancillary facilities included chemical storage, aeration blowers, and MCC building with control room. The facility meets the discharge limits. It is consistently reducing the influent BOD from 8,000-10,000 parts per million (ppm) to less than 10 ppm, and the influent TSS from 1,500-3,000 ppm to less than 10 ppm. It was designed for future expansion as well. Due to the project’s complexity and strict schedule deadline, it was vital the owner partnered with a GC and technology partner that could deliver the project in a timely and efficient way.

 The project received the National Electrical Contractors Association (NECA) – Project Excellence Award – 2007.