purification

The present study investigates the relevance of producing fluorine-containing polymers based on tetrafluoroethylene (TFE) and TFE-hexafluoropropylene (HFP) compositions. It has been demonstrated that the byproducts resulting from the degradation of these polymers are hazardous, and their recycling or disposal is challenging. A thorough analysis of contemporary methods of polytetrafluoroethylene (PTFE) recycling has been conducted, indicating that chemical processing of PTFE results in the generation of substantial quantities of monomers, including TFE, HFP, and cyclooctafluorobutene.

A polyphenylphosphonate containing 4,4'-dihydroxybenzophenone was synthesized as a flame retardant. However, impurities were detected and may compromise its properties and thermal stability. Thus, a purification route based on water and hexane extraction with reflux was proposed. Results showed success in removing impurities, especially P–Cl groups, without damaging the polymer.

A multi-stage method for producing an absorbent with increased absorption capacity based on agro-industrial wastes has been proposed. The method includes treatment of raw materials with sulfuric acid, mechanochemical modification, electrostatic separation, and cavitation stage. The expediency of the proposed adsorbent usage in the process of purification of contaminated water from fats, phenols, petroleum products, and heavy metal ions has been proved. The complex application of adsorbents (absorption of gaseous pollutants and wastewater purification) has been tested.

The prospects of the pharmaceutical industry development are closely connected with scientific and technological progress. In Ukraine, handling hazardous medical waste is an open question. The rapid development of pharmacy in recent years has created and increased the possibility of the generation and accumulation of pharmaceutical waste at the enterprises and in the environment. Only a few enterprises deal with medical waste disposal. Medical waste recyclingrequires an extremely high level of attention and carriesgreat risks associated with handling this medical waste.

The use of aqueous polymer dispersions of butyl acrylate-methyl-acrylate-methacrylic acid and polyvinyl acetate for purifying the surface of tiles of the 18th and 19th centuries, fragments of carved stone blocks of window frames XVII, bricks of the sixteenth and nineteenth centuries, and plaster brackets of the late nineteenth century, tiled tiles from the facade of the building of the city of Lviv, the areas of the surface of the Boim's chapel in Lviv, metal plates of models of coriand and stucco decor from the main building of the National University of Lviv Polytechnic.

Purification of glucomannan by hydrolising starch – the main contaminant – was studied. Hydrolysis removed 88.7 % of starch. The highest glucomannan сontent was found to be 73.35 %. The sample showed the comparable infrared spectra to those of the commercial glucomannan. The kinetics of enzymatic hydrolysis was evaluated using the Michaelis-Menten model.

Liquid waste and wastewater, that contain hypochlorites, are formed during the production of chlorine and caustic soda; electrolytic production of magnesium and chlorine; in the production of pulp and paper products etc. Such wastewaters belongs to sub-standard, therefore they are not reused in corresponding technological processes. In accordance with the current normative documents, hypochlorite wastewaters must be disposed of at the local treatment facilities of the enterprises where they are produced.

This work is an attempt to analyze the theoretical and practical aspects of landfill leachate treatment and analyze the pros and cons of the most widespread methods leachate treatment and suggest the method of complex purification of high-concentration sewage waters from solid domestic wastes (SDW) for example of Hrybovychi municipal solid domestic waste.

A review of literature concerning application of natural and modified zeolites for water and wastewater purification from inorganic (ionic) and organic pollutants is presented.

Досліджено основні проблеми, що виникають у сфері поводження з фільтратом
полігонів твердих побутових відходів. На основі даних про хімічний склад фільтрату
обґрунтовано необхідність встановлення локальних систем очищення фільтрату на
території полігону перед скиданням його в каналізаційну мережу та розроблено
принципову схему очищення фільтрату на прикладі Львівського полігону. Запропо-
новано ряд заходів щодо оптимізації поводження з твердими побутовими відходами, які