CONTROLLED BIODEGRADATION OF SYNTHETIC LUBRICATING (MOTOR) OILS IN INDUSTRIAL WASTEWATER
2023
Ganiev I. M. (Federal Center for Toxicological, Radiation and Biological Safety) | Morozov N. V. (STROYINVEST-LOGISTIK LLC)
Russian. Studies on controlled biodegradation of synthetic lubricating (motor) oils with hydrocarbon-oxidizing microorganisms (HOM) under statistical conditions were conducted. It was determined that under the load of lubricating oils in the treated effluent up to 1680 mgO2/dm3 by COD, up to 200 mgO2/dm3 by BOD5 and with the growth of microorganisms in the range 101-106 - 106-106 cells/cm3 (at continuous treatment regime – for 14 days) the degree of neutralization of water reaches 89.9%, which corresponds to the norm of treated water in the recycled water supply. Biooxidation efficiency of oils in the experiment is arranged in the following descending order: Shell Helix Ultra 5W-40 > Mobil 1 10W-60 > Castrol Magnatec 5W-40, 89,86; 50,23 and 38.71 %, respectively. These maximum values were obtained at their concentration in the medium from 1000 ± 6 to 1500 ± 6 mg/dm3. From the results of experiments it appears that biodegradation of synthetic oils by selective hydrocarbon-oxidizing microorganisms in a controlled mode is quite realistic, it is aimed at a practical solution for treatment of oil-containing wastewater of small sewage and large-tonnage industries.
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