DESTRUCTION OF PHENOL AT THE FORMATION OF POLYVIDOUS BIOFILM ON NATURAL AND SYNTHETIC CARRIERS IN THE BIOFILTER

Abstract

Aim. To determine the effectiveness of the process of water purification from phenol by microorganisms-destructors in the formation of a polyvidiofilm biofilm on natural and synthetic carriers in a biofilter. Methods. An association of phenol bacterium destructors — Aeromonas ichthiosmia ONU552, Basillus subtilis ONU551, Pseudomonas maltophilia ONU329, Pseudomonas fluorescens ONU328, Pseudomonas cepacia ONU327 was used. Stained biofilms were stained with 1% acridine orange solution. Microscopy of the samples was carried out under a Carl Zeiss fluorescence microscope and a Carl Zeiss, Primo Star light microscope with photo fixation. The concentration of phenol in water was determined by the extraction-photometric method using 4-aminoantipyrin. Results. Using fluorescence microscopy, it was confirmed that bacteria used for purification of water from phenol - destructors formed a biofilm in a biofilter on carriers of different nature – ceramic tubes, mussel valves, peat, zeolite, activated carbon, synthetic media such as "VIYA", sand. In laboratory conditions, the effectiveness of the operation of a column-based biofilter of flow-up-stage type with layer-by-layer complex loading of sorbents during purification of phenol-containing water (initial concentration of phenol – 300 mg/l) was confirmed. After 2 hours of the biofilter operation, the degree of water purification was 40% (residual phenol concentration in water 180±17.2 mg/ l), which was associated with phenol sorption on carriers; during biodegradation, it reached 90% (residual phenol concentration in water – 29.5±2.8 mg/l) on the 6th day. In the following days, the efficiency of the biofilter with continuous intake of phenol-contaminated water was at the level of 50–75%, and in the stationary-cyclic mode reached 80–90% (the concentration of phenol in the water varied from 29.5±2.8 to 60±5.7 mg/l). Conclusion. The new microbial consortium forms a biofilm on natural and synthetic filter carriers, which contributes to the effective purification of water from phenol and the flow-through biofilter operation time (up to 2 months) without additional regeneration.