Water treatment in a plant for intensive fish culture

摘要

The water is circulated in two circuits fed from a shared reservoir (110) for microbiological water treatment and mechanical solids separation. The solids separation is preferably carried out in a filter or microsieve (104). In the microbiological water treatment circuit there is a module (14) having a sedimentation section (20) into which water is fed at superatmospheric pressure. Above the sedimentation section (20) is arranged a flooded first fixed-bed reactor (22), through which flow ascends, for microbiological denitrification. The water passes via an overflow (34) and a trickle unit (36) into a second fixed-bed reactor (38) for microbiological nitrification. This is constructed as a trickling body and air flows through it by the chimney effect. Beneath the second fixed-bed reactor (38) is situated a collection trough (44) having an outlet (54) which leads back to the reservoir (110) via the filter or microsieve (104). An ozoniser circuit can be connected in parallel to the filter circuit and microbiological water treatment circuit. <IMAGE>