A METHOD AND A PLANT FOR BIOLOGICAL PURIFICATION OF WASTE WATER

摘要

A method and a plant (1) for biological treatment of waste water comprising a container (2) with a quantity of waste water containing a large number of separate carrying elements (8) kept enclosed in a riser pipe (5) placed vertically in the container. The carrying material is kept fluidised in the riser pipe by alternately blowing air in under the riser pipe and recirculating the water through this. The plant can easily and conveniently be placed as a unit in a container where the biological catabolism of organic material will be passing off effectively as aerobic and anaerobic conditions are alternately created in the biofilm. The plant is simple and compact and economical in use.