METHOD OF PURIFICATION OF SEWAGE Russian patent published in 1994 - IPC

FIELD: sewage purification. SUBSTANCE: sewage are filtrated through sulphur charging at the first stage and activated carbon at the second stage with subsequent regeneration of sulphur charging and activated carbon. Regeneration of sulphur charging is realized by way of keeping the latter under water column with subsequent natural and forced aeration or sulphur charging is treated by sulfide- containing gas with subsequent aeration. EFFECT: reduced losses of sulphur charging and prolonged duration of filtering cycle. 1 tbl