Temperature modification of diatomite sludge of oil extraction production at obtaining a sorbent

Abstract

One of the most widely used methods of water treatment is adsorption. The use of agricultural waste is of great interest in obtaining economical and efficient sorption materials. In this paper, the features of temperature modification of diatomite sludge are studied. Diatomite sludge is a multi-tonnage waste of oil extraction production formed during the purification of sunflower oil with diatomite. The kinetics of thermal activation of diatomite sludge at temperatures of 450, 500, and 600 °C was studied. It was found that the temperature of 450 °C is optimal for thermal modification of waste. In this case, part of the organic compounds is preserved, as with a further increase in temperature, they completely disintegrate into gaseous products. IR spectra and energy dispersion analysis were analyzed, and the structure and physical and chemical properties of diatomite and diatomite sludge were studied before and after heat treatment. It was found that the water extract of the samples, both initial and thermomodified, has a pH close to neutral. With an increase in the firing temperature, a small suspension effect is observed, which means the presence of a charge in the DSH particles in the aqueous medium, which can intensify the convergence of molecules with a positive charge with the surface of the sorbent. The development of methods for the secondary use of agricultural raw material processing waste for wastewater treatment allows solving comprehensively the problems of reducing the anthropogenic load on natural ecosystems, is an urgent task of modern society for environmental protection, and has scientific and practical significance.