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Production of Potassium-Enriched Fertilizer Using the Complex Sorption and Membrane Technology

Mkheidze Nino, Gotsiridze Raul, Kontselidze Lamzira, Mikeladze Zurab, Kharazi Nino

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 2

199--205

The production of potassium-containing fertilizer using improved, complex method was researched. Cheapness and availability of the raw material (the natural zeolite, clinoptilolite from Dzegvi and Tedzami mines is used as a substrate and seawater – as a source of potassium ions) make this method very interesting and prospective for the countries with clinoptilolite stocks, located in the seaside regions and engaged in agrarian industry (Georgia, Greece, Romania, Bulgaria). It includes two technological processes: sorption and membranes ones. At the first stage, for intensification purpose electrodialysis was used for concentration of sea water. The optimal parameters for concentration of sea water were matched using the electrodialysis apparatus produced in the Institute workshop. In the produced concentrate of sea water, the index of potassium-ion concentration exceeds 4, being twice higher than the natrium-ion concentration index. At the second stage, selection of sea water ions was provided on the natural zeolite by so called dual-temperature ion exchange method: during sorption of potassium by clinoptilolite at low temperature the other ions pass into filtrate. The received potassium-enriched zeolite is a new type fertilizer: potassium containing therein passes into soil "as needed", when soil is impoverished.

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.