Uzbekistan: mineral fertilizers made of coal wastes

The Uzbek Institute for mineral resources has developed a method to obtain an organic-mineral fertilizer of coal extraction wastes containing high percentage of gumin acid. The fertilizers are prepared by a biotechnological method. The wastes primarily mixed with a certain volume of benthonite or benthonite clay are put into the special container disseminated with specific microorganisms.

These microorganisms are separated previously from heaps and soil and then bred in the medium made of organic substances , for instance coarse cotton or rice meal. Ferments enrich the wastes with gumin acids . These acids present the principle ingredient of the natural product generated in the soil, the so called humus, which is the base of the soil fertility. The process takes one-three weeks. The processed mass is blown every day for 5-10 minutes with oxygen. The tests with the new fertilizer have shown it to rise the cotton harvest by over 10%. The experts say that there is no necessity to produce such fertilizers specially, they can be easily found in wastes, for instance the wastes of Angren coal washing plant contain over 10 million of those.

Дата:  17.12.2008

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