FIELD: sewage treatment. SUBSTANCE: biofilter media is made in the form of balls having an increased surface due to recesses of irregular tapered shape with rounded off faces and vertices forming in pairs a symmetry in hemispheres, at whose combination the recesses are arranged in a staggered order. The device air tank is furnished with a cap, having the shape of a triangular prism. EFFECT: facilitated procedure. 7 dwg
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