Restoration of Soil from Herbicide Pollution using Biochar from Sewage Sludge and Sawdust

Abstract

The results of studies of the effect of biocoal (biochar) from sewage sludge and sawdust on the physicochemical and biological properties of soil treated with herbicides are presented. Biocoals were obtained by pyrolysis in the absence of oxygen at a temperature of 500 ° C. It was found that the combined bio-charms from sewage sludge and wood waste stimulate the vital activity of soil microorganisms, increasing their population days after 15 days by 13.5 times, increase the biodegradation of the herbicide in the soil by 5 times in comparison with the soil without biochar treatment. The introduction of the combined biochar at a dose of 5% into the soil contaminated with herbicide increased the growth rate of tomatoes by 5 times. The proposed method of using sewage sludge and sawdust makes it possible to solve not only the problems associated with their utilization, but also to effectively restore soil from pollution.