New Organic-Mineral Fertilizer Based on Low-Grade Phosphorites and Microflora of Activated Sludge

The possibility of transforming a phosphorite rock containing less than 10% P 2 O 5 into a full-fledged organic-mineral nitrogen-phosphorus multielement fertilizer with subsequent disinfection of the obtained product is determined. X-ray fluorescent analysis of phosphorites shows that its microelement composition in quantitative terms coincides with the plant one, and therefore, applying this fertilizer, the plant can get all the necessary minor nutrient elements. As revealed, for the samples with the liquid phase, microorganisms have the high activity in comparison with the control variants that is associated with the impact of a biogenic factor only. The ability of microorganisms of activated sludge to degrade insoluble compounds of phosphorite ore and slime and to transform their insoluble form into soluble one is shown. The process flow diagram and points of the addition of low-grade phosphorites and phosphorite slime to the primary and secondary sedimentation tanks tested at the operating biochemical treatment station are given. Thus, the obtained solid condensed deposits from low-grade phosphorites and sludge will contain up to 18-22% P 2 O 5 , 12-14% nitrates and nitrites, 4-5% K 2 O, and CaO and MgO, which are digestible together with the accompanying set of all trace elements by plants.

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