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An environmentally friendly method for phosphogypsum processing into N,Ca,S,P-fertilizers is proposed. Thus, was obtained a complex liquid N,Ca,S,P-fertilizer with the content of nutrients (% wt.) N:Ca:S:P = 56:26:12:6 in the dry product, and 16.8:3.6:7.8:1.8 in the liquid phase. The obtained fertilizer increased the yield of radish by 7.16% compared to the control. The advantage of the proposed method is reducing the cost of the fertilizer, increasing its nutritional value, and obtaining useful products from the waste.

Cellulose-containing waste from the agricultural industry modified by chemical methods is capable of adsorbing metal ions no worse than industrial sorbents (ion exchangers, activated carbons, zeolites, etc.). A wide range of methods for modifying plant raw materials makes it possible to obtain effective sorbents that are environmentally friendly and biologically inert. Proposed technologies of lignocellulosic sorbent manufacturing are highly economically feasible and, additionally, eco-friendly, because they ensure the proper utilization of agricultural wastes, which are very widespread in Ukraine.

Here we show the effect of the ionic liquid nature, its content and monomer/crosslinker ratio on the copolymerization of N-vinylpyrrolidone (NVP) with triethylene glycol dimethacrylate (TEGDMA) induced by UV or heat irradiation. For the first time, kinetics curves of photopolymerization NVP with TEGDMA in the presence of ionic liquids are obtained. The ionic liquids EmimBF

This paper studies the effect of mechanical pretreatment of NPKCa-containing waste (vegetable waste VW and thickened sewage activated sludge TSAS) on biogas production and agronomic quality of the digestates. The efficiency of this process was evaluated by the yield of methane during anaerobic co-digestion with bioadditive (cheese whey), as well as the nutrients content in digestates by using an agrochemical test. It was found that with increasing comminution intensity the particle size of the substrate decreases from 50 to 16 μm which causes an increase in biogas yield by ~30%. As a result, the carbon content in the digestates decreases from 72 to 44%, whereas nutrients content increases by, %TS: N – 3.4; P – 3.7; K – 3.7; Ca – 7.6. The grinded substrate was used for anaerobic digestion with the addition of various amounts of cheese whey. Obtained digestates have a stimulating effect on the growth of barley and peas plants. In particular, digestion with 3 wt% of whey had the maximum impact on plant yield (+0.3–0.4 t ha−1 compared to control). Moreover, the combination of vigorous comminution with the addition of whey leads to a significant reduction in the fermentation duration (up to 4 times) and increases biogas production by 41%. Obtained digestates can be considered as organo-mineral fertilizers since they contain up to 43% of the total amount of NPKCa and meet the requirements for the content of heavy metals under Ukrainian legislation.

It is found that a high degree of purification from emulsified coal tar is achieved in the phenolic wastewater treatment using 88 mg/dm 3 of sodium bentonite with the addition of 8 mg/dm 3 of cationic flocculant in conditions the closest to industrial. This innovative method of phenolic wastewater treatment is cost­effective because of the low cost of bentonite. It is shown that the deposit formed during the wastewater treatment with bentonite floats to the liquid surface and can be separated by a scraper device for further utilization in construction. The process of biological treatment of phenolic wastewater in the combined aerator­clarifier unit is shown. It is determined that the optimum time for efficient phenol extraction from wastewater is 6 hours. It is experimentally proved that the use of this unit makes the biological treatment process 4 times faster giving significant economic benefits by reducing energy consumption for aeration. The flow diagram of complex wastewater purification from coal tar and phenol is developed. The use of it at coke and chemical plants will significantly increase the treatment efficiency and product profitability.