The paper presents the results of the selection of the flocculent and coagulant types as well as the evaluation of the best parameters of treatment of wastewater deriving from meat-bone meal (MBM) production. The efficiency of purification depends on the composition of the coagulant and flocculent as well as the magnitude of the applied dose. The use of ferrous sulfate PIX 113 coagulant assured the highest reduction of the contamination content in filtrate, resulting in the reduction of color of wastewater by 96.8%, turbidity by 99.2%, and the phosphorus content by 99.9% and nitrogen by 92.4%, with the Chemical Oxygen Demand (COD) being reduced by 62.8%. The X-ray method proved the significant presence of phosphorus salts in the content of sediment. The moisture content in the sediment varied from 45 to 78.5%. The elaborated method of pretreatment of wastewater from meat-bone meal unit was verified on an industrial scale. A very high reduction of the phosphorus content in filtrate (> 99.9%), and a significant reduction of COD as well as nitrogen and suspended solid contents (90−95%) were presented. A high reduction of contamination in filtrate increases the production capacity of the existing biological treatment plant, in the next step of treatment of filtrate in the biological treatment unit.
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