Advanced Biosolids Management System

The Fairfield-Suisun Sewer District’s (FSSD) wastewater treatment plant (WWTP) required major renovations and expansion to keep pace with the region’s economic and population growth and technological advancements in the wastewater industry.

Through a unique, P3 partnership with Lystek, the District now hosts a sustainable, year-round Organic Material Recovery Center with the capacity to manage 150,000 tons of biosolids annually. This new facility now processes 14,000 tons a year from the FSSD, as well as material from the cities of San Francisco, Santa Rosa, Central Marin Sanitation Agency, and a host of other communities in the Bay Area.

The multi-use Lystek system can be used to convert biosolids into a Class A EQ biofertilizer product or to reduce “waste” volumes and increase biogas production in digesters for green energy. The end material can also be used as a safe, affordable alternative source of carbon for use in biological nutrient removal (BNR) systems.

SPIRAC was selected by Lystek to play a role in the development of a practical solution to manage large volumes of biosolids and other organic feedstock. Currently one live bottom receiving bunker feeds the feedstock silo. The scalable system also needed to allow for future growth and capacity. Therefore, it was purposely built to allow for the addition of a second receiving bunker, as required, in the future. The system can handle biosolids in the range of 15 - 30% D.S. The Live-Bottom silo can handle a maximum volumetric flow rate of 2100yd3/hr (1600m3/hr). and has a total capacity of 310yd3 (240m3).

SPIRAC PRODUCTS USED
 
1. Live-Bottom Receival Bunker with four U500 Shaftless Conveyors
2. Cross Collector OK620
3. Vertical Shaftless Conveyors two OK500
4. Shaftless Conveyor U620
5. Shaftless Conveyor U620
6. Live Bottom Silo with four U500
7. Cross Collector OK500
8. Vertical Shaftless Conveyor OK620
9. Shaftless Conveyor OK500
 

 

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