Written by Eric Wanstrom, December 1, 2016
Ocean County Utilities Agency (OCUA) had been producing OCEANGRO fertilizer with Biosolids from their Central Treatment Plant with great success. Currently, every bag of OCEANGRO produced is sold in the community. Ocean County looked to increase the production of OCEANGRO to meet the increasing demand by using Biosolids from their North treatment plant. This posed several challenges though: How would they get the Biosolids into the trucks at the North Plant? How would they get it out of the trucks at the Central plant? Once there, how would they blend the stream of the two differing Biosolids to make the uniform blend of material required by their Biosolids dryer?
Schwing Bioset was able to work with Ocean County to provide a solution to the challenges of loading, receiving, and blending the Biosolids. Schwing Bioset manufactured a custom designed storage silo with a sliding frame feeder at the North plant, designed to load trucks with Biosolids. This silo would store the Biosolids and rapidly feed it into the trucks, but first the biosolids would have to get there from the new Belt filter presses, a distance of roughly 300 feet. So, Schwing Bioset supplied high pressure piston pumps rated for 100 bar line pressure to pump the biosolids from the dewatering collection area to the top of the truck loading silo.
At the Central plant, there are two sliding frame silos to receive the biosolids coming from the North plant. The sliding frames easily feed the material to the close-coupled pumps and can even push small rocks and tramp material that might make their way into the trucks or bins. The silos are equipped with covers to contain odors from the biosolids and are large enough to each receive a full 25-ton truck load of cake. The two storage silos provide ample capacity, allowing Operators at the Central plant to meter the North biosolids feed with the feed from the Central plant and provide a uniform blend for pressing the OCEANGRO fertilizer.
The silos give Ocean County Utilities exactly what they needed, the ability and the flexibility to process the additional biosolids from the North plant at the rate needed to keep production running smoothly at the Central plant, while accomplishing the goal of increasing the amount of biosolids beneficially re-used as OCEANGRO fertilizer.
For further information on the project, visit this website: http://www.ocua.com/OceanGro/SitePages/Home.aspx