USAGE OF Lemna minor DUCKWEED FOR MALT PLANT WASTEWATER TREATMENT FROM FERRUM COMPOUNDS

The aim of the work is to determine the rational parameters of the malt plant wastewater treatment from ferric compounds in a flow-through experimental bioreactor with the use of duckweed. The main tasks of the study were as follows: to determine the effect of the initial concentration of the ferrum, the amount of biomass introduced and the duration of the purification process to reduce the content of ferric compounds in the wastewater. The studies were carried out on existing sewage treatment plants. They used a semi-production unit incorporated into the technology before the decontamination step. The results show that the logarithmic nature of the biological process was detected in the concentration range from 0.2 to 1.3 mg/dm3. Under these conditions, the rational values of the duration of the purification process is found to be 3-8 h with the Lemna minor biomass value not exceeding 12 g/dm3. It has been first demonstrated that the effect of sewage treatment from ferric ions in the bioreactor with Lemna minor was up to 40% and depended on the initial concentration of the ferrum compounds in water at the existing wastewater treatment plants at a semi-production unit for biological treatment of wastewater from ferric compounds.