Application of plant pyrocarbon sorbents to increase soil fertility and clean from oil pollution
DOI:
https://doi.org/10.18321/cpc22(1)49-60Keywords:
pyrocarbon, sorption capacity, iodine-organic complex fertilizer, increasing fertility, cleaning from oil pollution.Abstract
In recent years, pyrochar has been widely used in the field of soil quality improvement. Adding pyrochar led to the effectively reducing of soil density and the fertility of the soil cover is increased. In this work, the physicochemical properties of pyrochar obtained from various plant material residues - apricot kernels, wheat straw, rice husks, reed stems and pine sawdust - were investigated. Such characteristics as sorbent porosity, bulk density, particle size distribution, elemental composition and sorption capacity with respect to iodine and hydrocarbons were determined. A computational analysis of experimental data on nitrogen sorption isotherms on pyrocarbon samples using the Barrett-Joyner-Halenda method, as well as the Dubinin-Radushkevich equation, showed that pyrocarbon samples from pine sawdust, apricot kernels and rice husks have a developed specific surface area, as well as the presence of micro- and mesopores. The maximum volume of micropores was determined in samples of pyrolytic charcoal from pine sawdust and amounted to 0.58 cm3/g. Samples of pyrocarbon from apricot kernels with the highest iodine number of 51.23% were used for the sorption of complex organiodine fertilizer in order to increase soil fertility.All samples of pyrocarbon of plant origin were tested in field tests to clean up oil-contaminated areas near the Zhanatalap field in the Isatay district of the Atyrau region. Thus, on the 16th day of testing pyrochar from rice husks in field conditions, it was possible to achieve a soil oil purification value of 67.1%.
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