FIELD: purification of sewage; purification of geothermal and side petroleum water comprising organic compounds, for example, phenol and humus compounds; oil and gas processing industry. SUBSTANCE: sewage is applied into reactor being filled by filler with microorganisms being immobilized on it and by adsorbent. Granulated activated coal is used as said adsorbent, its quantity being 30-100 g/l. Temperature of liquid is 20-45 C. In said reactor biological and adsorption processes take place simultaneously. EFFECT: improved efficiency of purification; simplified process; decreased cost of the process. 2 cl
