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We have carried out research on multi-stage handling of polyethylene terephthalate and polystyrene household waste. The method has been developed for both their safe utilization in manufacturing technologies and the use of encapsulated mineral fertilizers. The technical feasibility of implementing all stages of plastic waste processing has been defined: separate collection, creation of a film-forming composition, encapsulation of granular fertilizers. Our study has confirmed the safe biodegradation of polymer shell residues in the soil environment after the dissolution of the fertilizers. The proposed method of handling of these wastes is a method of their safe utilization.

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As the world's population grows, the problem of food shortages becomes global, and, for human survival, it is necessary to significantly increase food production, which may increase environmental pollution. This paper has theoretically and practically substantiated the expediency of coagulation treatment of wastewater from milk-processing enterprises. The coagulant proposed to use is a multi-tonnage waste from industrial enterprises, specifically technical ferrous sulfate. It is shown that it is advisable to use the dairy effluent imitations based on milk powder for experimental studies. The potentiometric titration of dairy effluent imitations has established the presence of two points (pH=4.2 and 8.3), which characterize the boundaries of the buffering capacity of solutions. The expediency of carrying out the process of coagulation of dairy effluents in a weakly alkaline environment at pH≥8.3 has been substantiated, and, for the starting effluent to reach such a pH value, a 10-% suspension of Са(ОН)2 should be used. The effectiveness of reagent treatment of dairy effluents has been experimentally confirmed, subject to the alternate introduction of a coagulant (technical FeSO4) and flocculant (polyacrylamide) in the quantities of 120 and 40 mg/dm3, respectively; the degree of clarification of dairy effluents is 90 % while the residual COC value is 76 mgO2/dm3. It has been shown that when ultrasound was applied, it was possible to significantly reduce the interaction time and the amount of Са(ОН)2 suspension necessary to achieve pH≥8.3. Thus, there are grounds to assert the prospects for devising highly effective technology for the coagulation treatment of wastewater from milk-processing enterprises; the results and conclusions reported here about the technological feasibility of using technical FeSO4 as a coagulant could be practically applied for other technologies of coagulation wastewater treatment, provided that its pH value is brought to 8.3.

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