| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sewage purifying device for pisciculture in a simple structure capable of reducing a cleaning frequency as many as possible. SOLUTION: This sewage purifying device for the pisciculture is composed of an aerobic biological treatment tank provided with a filtering material for performing the aerobic biological treatment of processing water, the sprinkling device of the processing water arranged on the filtering material, the water discharge device of the processing water arranged under the filtering material and a discharge device for removing dregs deposited under the filtering material and a component adjustment tank 61 for supplying minerals to the processing water discharged from the water discharge device and reducing nitrate ions. Inside the tank, the processing water is turned to a downward stream and the efficiency of deposition is improved.</p> |
