Here are some pics from a few months ago of Tavon and Bill performing drum filter maintenance on one of UDC’s aquaponic systems.
A drum filter allows an aquaponic system to divert solid fish waste to a separate tank. In this separate tank the fish waste is able to safely break down and gradually release the bound-up nutrients back into the system.
Fish tank water enters into the center of the drum and must pass through the screen mesh to outside the drum. All solid waste larger than 100 microns is trapped within the drum.
A sensor detects when the drum is to capacity with waste. The drum starts to spin rapidly. Four spray nozzles (which we see Tavon installing below) spray the solid waste off the mesh and flush it to the solids-diversion tank.
Differences of opinion exist within the aquaponics community whether it’s better to break down the solid fish waste aerobically or anaerobically (with or without oxygen). Each process involves a different set of bacteria and different costs and benefits. We shall see how the debate evolves…