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Low-Waste Technology for Water Purification from Iron Ions

Trus Inna, Halysh Vita, Gomelya Mukola, Radovenchyk Vyacheslav

Ecological Engineering & Environmental Technology

2021

Vol. 22, iss. 4

116--123

As a result of the anthropogenic activity and the continuous increase in the scale of water consumption, surface and groundwater, which are sources of freshwater, have been degraded. Today, most water sources have high iron content. Contamination of groundwater with iron and other metals can occur due to the development of ore deposits and the operation of quarries. The existing technologies solve this problem only partially. Ions of heavy metals are toxic and dangerous for living organisms, including human beings. In this regard, it is important to develop effective methods of water treatment of various pollutants. Today, pollution of water bodies with iron ions has reached a critical level. This creates a problem for many regions not only in Ukraine, but also far beyond its borders. The problem is urgent and needs to be solved. When the pH value in water is less than 6.8–7.0 and the concentration of iron is high, it is advisable to use a combination of a number of methods with the introduction of reagents in order to perform deep purification. The reagent method of deironing is implemented by treating the source water with a suspension of lime water Ca(OH)2. This approach allows deironing water effectively, but its implementation is accompanied by the formation of a large amount of sludge, which must be disposed of. An effective way to dispose of such precipitates is their use as a chemical additive in the production of cement, which was confirmed by the conducted research.

Utilization of Modified Biosorbents Based on Walnut Shells in the Processes of Wastewater Treatment from Heavy Metal Ions

Halysh Vita, Trus Inna, Gomelya Mykola, Trembus Iryna, Pasalskiy Bogdan, Chykun Nadiia, Trokhymenko Ganna, Remeshevska Iryna

Journal of Ecological Engineering

2020

Vol. 21, nr 4

128--133

The problem of utilizing plant wastes of the agro-industrial complex is equally important and urgent. In this regard, it is advisable to develop a complex technology of plant waste application to solve the ecological problems of environmental pollution with heavy metals. Modification of walnuts shells with orthophosphoric acid has proven to be a promising process for obtaining the biosorbents with the efficient sorption properties. It was found out that the increase in the concentration of inorganic acid in modification time promotes the improvement in sorption capacity. Such biosorbents can be used in low-waste water demineralization systems. The utilization of waste biosorbents through the use in the composition of building materials is effective from an economic point of view. It was shown that the biosorbent acts as a fine additive; the increase in normal density and acceleration in hardening time takes place. At the same time, the compressive strength of the cement with the application of biosorbents decreases slightly. The results show that the modified walnuts shells have a slightly adverse effect on the hardening time of cement.

Spent Biosorbents as Additives in Cement Production

Halysh Vita, Trus Inna, Nikolaichuk Alina, Skiba Margarita, Radovenchyk Iaroslav, Deykun Iryna, Vorobyova Viсtoria, Vasylenko Inna, Sirenko Ludmila

Journal of Ecological Engineering

2020

Vol. 21, nr 2

131--138

The research is related to solving the problem of rational use of materials and to the creation of resource-saving technologies for the protection of the environment from pollution. Sorption technologies are quite effective in wastewater treatment, but most sorbents are quite expensive, and their regeneration raises the question of recycling of spent solutions. The cheapness and availability of raw material base of biosorbents makes these technologies attractive for wastewater treatment. The research is aimed at investigation of the ways to effectively utilize the spent sorbents, which are obtained after water purification, in the production of building materials. The obtained results allow creating a complex low-waste technology of water demineralization and purification from heavy metal ions.