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Production of the Microfiltration Membranes of Wide Range Porosity, High Mechanical, Thermal and Chemical Stability by ,,Green’’ Fabrication Method

Mkheidze Nino, Gotsiridze Raul, Mkheidze Svetlana, Tenieshvili Ketevan

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 8

301--310

In the modern technological processes, the microfiltration membranes are used for removal of the suspended particles, colloids and microorganisms from the liquid solutions, as well as for use of the biologically active substances. Their demand at the world market rises day by day and if their production from the polymeric materials having wide range porosity, as well as high mechanical, thermal and chemical stability is provided the field of their use will expand even more. Proceeding from all above, fluoroplastic (F-4) was chosen, as the thermo- and chemically stable polymer used in medicine and food industry for production of the wide range porosity microfiltration membranes. The methods used for modification of membranes in the process of the research do not require any toxic solvents or complicated appliances or high power inputs. The thermo- and chemical stability of the produced membranes allows their multiple use in the process of filtration, which also allows implementing the principles of ,,green” technology. Pore sizes distribution of membranes was researched on Porometer by using the method of capillary flow porometry in compliance with the standards of ACTM F-316-03, which rules out using of the toxic (or hazardous substances), ex. mercury.

Improvement of Technological Modes of Electrodialysis Apparatus for Treatment of Chromium-Containing Waste Waters

Mkheidze Nino, Gotsiridze Raul, Kontselidze Lamzira, Mkheidze Svetlana, Davitadze Ruslan

Ecological Engineering & Environmental Technology

2021

Vol. 22, iss. 5

47--54

The wastewaters of galvanizing plants contain toxic heavy metals, which causes pollution of the environment and endangers it. The aim of the present study includes concentration of chromium (VI) ions from chromium plating wastewaters, purification of wastewater and its reuse for development of waste-free technological cycle. This study was carried out with the pilot electrodialysis apparatus designed by the authors and produced in the Institute engineering workshop using real plating rinse water of the plating shop. The authors obtained desalinated water which may be recirculated in rinsing bath and chromium salts concentrate that can be applied in chromium plating bath after correction. As a result of the conducted experiment, the ion-exchange membranes resistant to "poisoning" with chromium (VI) ions and stable in the process of regeneration were selected and the technological modes for stable operation of apparatus matched.