BINDING OF HEAVY METALS IN THE SOIL COMPLEX AT THE INTRODUCTION BIOCOMPOSITE BASED ON SEWAGE SLUDGE AND PHOSPHOGYPSUM
Journal Title: Молодий вчений - Year 2018, Vol 1, Issue 53
Abstract
The article focused on study the processes of fractional changes of heavy metal compounds in the soil complex under introducing biogenic composite material on the basis of sewage sludge and phosphogypsum by conducting microfield studies of the remediation process of model soils. The study was based on implementation of microfield studies of the remediation process of model soils in blocks filled with gray forest soil from a territory with a high level of technogenic load. X-ray diffractometric studies of the mineral component were carried out. The research was carried out on an automated diffractometer DRON-4-07. The microscopic analysis was carried out using surface area images of a high resolution spatial resolution and depth of reflection (BSE) electrons using a SEM-EDX raster electron microscopy in combination with microanalysis for the creation of maps of the mineral composition of soil samples and biocomposite. The fractions of heavy metals in the polluted soil was presented mostly of bound to oxides and hydroxides of Fe and Mn. The increase in the proportion of metals that were tightly bound in the mineral-organic structure that not available to plants was estimated after implementing measures to purification the soil complex with introducing the biocomposite. The most significant changes in the fractional composition of heavy metals were due to an increase in the proportion of stable compounds with organic matter and residual fraction. Thus, at purification of contaminated soils, a significant increase in the relative fraction of residual fraction of lead and cadmium was observed at all levels of acidity from 5.6-9.05% wt. to 45.3-51.7% wt.
Authors and Affiliations
Y. Y. Chernysh, L. D. Plyatsuk
Keywords
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