ABSTRACT
This chapter discusses one possible operational mode for the holding system design. The description of the bench scale automated system includes designs for the holding system and algae chemostat, the overall system operation, and the computer control/monitoring. The clam tank and trays were designed in accordance with the federal shellfish depuration guidelines. Proper water quality maintenance was accomplished using a pressurized upflow sand filter to entrap suspended solids and provide high nitrification capabilities at low substrate levels Design criteria for the filter followed those established for soft crawfish recirculating systems. The sump provides water quality buffering capacity, collects the water draining from the holding tank, receives the excess overflow from algae input, and provides a water source for the main system pump. The algae chemostat to support feeding in the Rangia clam recirculating holding system was sized based on algae growth kinetics and Rangia clam consumption studies.
