Effect of Biochar Amendment on Tylosin Adsorption-Desorption and Transport in Two Different Soils

Abstract

The role of biochar as a soil amendment on the adsorption-desorption and transport of tylosin, a macrolide class of veterinary antibiotic, is little known. In this study, batch and column experiments were conducted to investigate the adsorption kinetics and transport of tylosin in forest and agricultural corn field soils amended with hardwood and softwood biochars. Tylosin adsorption was rapid at initial stages, followed by slow and continued adsorption. Amounts of adsorption increased as the biochar amendment rate increased from 1 to 10%. For soils with the hardwood biochar, tylosin adsorption was 10 to 18% higher than that when using the softwood biochar. Adsorption kinetics was well described by Elovich equation ( ≥ 0.921). As the percent of biochar was increased, the rates of initial reactions were generally increased, as indicated by increasing α value at low initial tylosin concentration, whereas the rates during extended reaction times were generally increased, as indicated by decreasing β value at high initial tylosin concentration. A considerably higher amount of tylosin remained after desorption in the corn field soil than in the forest soil regardless of the rate of biochar amendment, which was attributed to the high pH and silt content of the former. The breakthrough curves of tylosin showed that the two soils with biochar amendment had much greater retardation than those of soils without biochar. The CXTFIT model for the miscible displacement column study described well the peak arrival time as well as the maximum concentration of tylosin breakthrough curves but showed some underestimation at advanced stages of tylosin leaching, especially in the corn field soil. Overall, the results indicate that biochar amendments enhance the retention and reduce the transport of tylosin in soils.

Assessing the sorption and leaching behaviour of three sulfonamides in pasture soils through batch and column studies

“…Unlike some recent studies (Fan et al, 2011;Jeong et al, 2012), no tailings and asymmetrical breakthroughs were observed for the bromide BTCs, indicating the absence of physical non-equilibrium conditions during the transport of the antibiotics through the soil columns. The nonsorbing bromide breakthrough curves were all quite symmetrical (Fig.…”

“…where R (the dimensionless retardation factor) accounts for fully reversible reactions of a solute species in the soil system (Jeong et al, 2012), ρ is the soil bulk density (kg m −3 ), θ is volumetric water content (v/v), and K d , the linear sorption coefficient (L kg −1 ). However, for nonlinear sorption coefficients obtained from Freundlich isotherms the equation can be written as…”

Treatment technologies for emerging contaminants in water: A review

“…However, the study undertaken by Jeong et al [80] found that despite using biochar from different feedstock materials and different thermal treatment conditions for the removal of tylosin, the removal rate was in the range of 10% for all the products. This outcome is attributed to the chemical structure of tylosin which includes several hydroxyl groups when compared with other antibiotics such as sulfamethoxazole.…”

Characterizing Properties of Biochar Produced from Simulated Human Feces and Its Potential Applications

“…Feedstocks of animal or human origin may also contain substantial quantities of unmetabolized antibiotics that could lead to the development of antibiotic resistance in the soil microflora on amendment (Ippolito et al, 2012). The fate of antibiotics on charring is largely unknown, even though active sorption of veterinary drugs by biochars has been demonstrated in soil (Jeong et al, 2012) and in water (Li et al, 2015).…”