WASTE WATERS PURIFICATION FILTER AND METHOD TO PRODUCE FILTERING FILLER Russian patent published in 1995 - IPC

FIELD: waste waters and in particular cattle-breeding complexes waste waters purification. SUBSTANCE: filter has body in which filtering filler is located. Filler is made of organic material of vegetable origin, for example, tree bark, over which layer of grass turf is placed. The layer is formed by grass seeds planting on surface of tree bark with following watering by waste waters. EFFECT: layer of grass turf prevents formation of crust and improves organic wastes decomposition. 2 cl 1 dwg