At this stage of the work, to study the processes of obtaining organic fertilizers, the wastewater sludge from the city of Navoi was used (wt.%): Moisture -65.43; ash -9.74; organic matter -24.83; humic acids -3.05; fulvic acids -7.47; water-soluble organic substances -2.13; P 2 O 5 -1.39; N 1.17; K 2 O -0.44; CaO -4.14 [21] .
To table 1 The chemical analysis of the sewage sludge of the city of Navoi, sludge phosphorite and their products was carried out by the following methods. Humidity was determined according to GOST 26712-85, ash content according to GOST 26714-85 and organic matter according to GOST 27980-80. The amount of the water-soluble fraction of organic substances extracted from the products with water was determined by filtration and evaporation in a water bath, drying the solid residue to a constant weight, and then burning it to determine the ash content and subtract it. Humic acids were isolated by treating the products with 0.1 N alkali solution followed by acidification of the solution with mineral acid [22] . The solid phase after the separation of alkali-soluble organic substances from it contains residual organic matter. It was thoroughly washed with distilled water, dried to constant weight, and the content of organic substances was determined. The difference between the amounts of alkali-soluble organic substances and humic acids gives us the content of fulvic acids. All P 2 O 5 forms were determined by the gravimetric method by precipitation of the phosphate ion with a magnesia mixture in magnesium ammonium phosphate, followed by calcination of the precipitate 1000-1050°C according to GOST 20851.2-75. Assimilable forms of Р 2 О 5 were determined by solubility in both 2% citric acid and 0.2 M Trilon B. The determination of CaO was carried out complexometrically: by titration with a 0.05 N Trilon B solution in the presence of a fluorexon indicator.
For the decomposition of MM, sulfuric acid used with a concentration of 92%. The rate of sulfuric acid varied in the range of 30-70% of the stoichiometry for the decomposition of CaO phosphate feed. The experiments were carried out as follows; sulfuric acid was slowly poured into a glass reactor in which a sample of the phosphorite was located. The duration of the interaction of the components was 30 minutes, after which sewage sludge was added to the pulp, and stirring was continued for 60 minutes. Drying was carried out at 80°C until the moisture content in the finished product 10-15%. The processing of sulfuric acid decomposition products by sewage sludge was carried out in the range of weight ratios of sewage sludge to MM from 100: 10 to 100: 40. The results are shown in figures 1-3.
To table 1 The chemical analysis of the sewage sludge of the city of Navoi, sludge phosphorite and their products was carried out by the following methods. Humidity was determined according to GOST 26712-85, ash content according to GOST 26714-85 and organic matter according to GOST 27980-80. The amount of the water-soluble fraction of organic substances extracted from the products with water was determined by filtration and evaporation in a water bath, drying the solid residue to a constant weight, and then burning it to determine the ash content and subtract it. Humic acids were isolated by treating the products with 0.1 N alkali solution followed by acidification of the solution with mineral acid [22] . The solid phase after the separation of alkali-soluble organic substances from it contains residual organic matter. It was thoroughly washed with distilled water, dried to constant weight, and the content of organic substances was determined. The difference between the amounts of alkali-soluble organic substances and humic acids gives us the content of fulvic acids. All P 2 O 5 forms were determined by the gravimetric method by precipitation of the phosphate ion with a magnesia mixture in magnesium ammonium phosphate, followed by calcination of the precipitate 1000-1050°C according to GOST 20851.2-75. Assimilable forms of Р 2 О 5 were determined by solubility in both 2% citric acid and 0.2 M Trilon B. The determination of CaO was carried out complexometrically: by titration with a 0.05 N Trilon B solution in the presence of a fluorexon indicator.
For the decomposition of MM, sulfuric acid used with a concentration of 92%. The rate of sulfuric acid varied in the range of 30-70% of the stoichiometry for the decomposition of CaO phosphate feed. The experiments were carried out as follows; sulfuric acid was slowly poured into a glass reactor in which a sample of the phosphorite was located. The duration of the interaction of the components was 30 minutes, after which sewage sludge was added to the pulp, and stirring was continued for 60 minutes. Drying was carried out at 80°C until the moisture content in the finished product 10-15%. The processing of sulfuric acid decomposition products by sewage sludge was carried out in the range of weight ratios of sewage sludge to MM from 100: 10 to 100: 40. The results are shown in figures 1-3.
