This article discusses the main stages and features of wastewater treatment at LLC “Food Ingredients” (Russia, Krasnodar region) involved in vegetable oils and fats refining. Experimental data on averaged qualitative composition of industrial wastewater from January to June, 2018 are presented. The indicators of the quality of averaged waste do not exceed: 20 mg/l for ammonium nitrogen; 20 mg/l for phosphates; 800 mg/l for suspended solids; 700 mg/l for fatty substances. Work of biological aeration tank were analyzed from January to June, 2018. The graphic dependences of the change of sludge index, phosphate ions, chemical oxygen demand (COD), and temperature are given. Species composition of microorganisms and their amount were determined by optical microscopy. Absolute quantity of microorganisms in activated sludge was determined by “calibrated droplet” method. As of October 31, 2018 the quantity of microorganisms was as follows, U/ml: small flagellates – 44,015; free swimming infusoria – 34,233; Euglypha – 6,520; Vorticella – 27,713; Rotatoria – 29,343; Aspidiska – 36,950; Aelosoma – 2,173; Heliozoa – 1,086. No filamentous microorganisms were detected. After treatment the recovered water was characterized by the following indicators of the quality: transparent, ammonium nitrogen content in water was less than 0.1 mg/l, phosphate ion content was not higher than 0.2 mg/l; COD was not higher than 30 mg O2/l, hydrogen index was about pH = 7. These indicators comply with the requirements for water in technical water supply systems of industrial enterprises (Russia), as applied to recovered water produced of wastewater for subsequent use in recycled water supply system. The treated water is reused in production processes, which evidences high quality of water treatment and reliable operation of equipment in local treatment facilities at LLC “Food Ingredients” during 10 years of operation