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2 Journal of Ecological Engineering

2 2020

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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.