Punamiya Pravin, Sarkar Dibyendu, Rakshit Sudipta, Elzinga Evert J, Datta Rupali
Department of Earth and Environmental Studies Environmental Management Program, Montclair State University, One Normal Avenue, Montclair, NJ, 07043, USA.
Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville, TN, USA.
Environ Sci Pollut Res Int. 2016 Feb;23(4):3322-32. doi: 10.1007/s11356-015-5551-y. Epub 2015 Oct 21.
Veterinary antibiotics (VAs) are emerging contaminants of concern in the environment, mainly due to the potential for development of antibiotic-resistant bacteria and effect on microbiota that could interfere with crucial ecosystem functions such as nutrient cycling and decomposition. High levels of VAs such as tetracyclines (TCs) have been reported in agricultural soils amended with manure, which also has the potential to cause surface and groundwater contamination. Several recent studies have focused on developing methods to immobilize VAs such as composting with straw, hardwood chips, commercial biochar, aeration, mixing, heat treatment, etc. The major shortcomings of these methods include high cost and limited effectiveness. In the current study, we assessed the effectiveness of aluminum-based drinking water treatment residuals (Al-WTR) as a "green" sorbent to immobilize TCs in manure and manure-applied soils with varying physicochemical properties by laboratory incubation study. Results show that Al-WTR is very effective in immobilizing tetracycline (TTC) and oxytetracycline (OTC). The presence of phosphate resulted in significant (p < 0.01) decrease in TTC/OTC sorption by Al-WTR, but the presence of sulfate did not. attenuated total reflection (ATR)-FTIR spectroscopy indicate that TTC and OTC likely forming surface complexes via inner-sphere-type bonds in soils, manure, and manure-applied soils amended with Al-WTR.
兽用抗生素（VAs）正成为环境中令人担忧的新兴污染物，主要是因为其可能导致抗生素耐药菌的产生，并对微生物群产生影响，进而干扰养分循环和分解等关键生态系统功能。据报道，在用粪便改良的农业土壤中，四环素（TCs）等高含量的兽用抗生素也有可能造成地表水和地下水污染。最近的几项研究集中在开发固定兽用抗生素的方法，如与秸秆、硬木片、商业生物炭一起堆肥、曝气、混合、热处理等。这些方法的主要缺点包括成本高和效果有限。在本研究中，我们通过实验室培养研究评估了铝基饮用水处理残渣（Al-WTR）作为一种“绿色”吸附剂，在不同理化性质的粪便和施有粪便的土壤中固定四环素类抗生素的有效性。结果表明，Al-WTR在固定四环素（TTC）和土霉素（OTC）方面非常有效。磷酸盐的存在导致Al-WTR对TTC/OTC的吸附显著（p < 0.01）降低，但硫酸盐的存在则没有。衰减全反射（ATR）-傅里叶变换红外光谱表明，TTC和OTC可能通过内球型键在土壤、粪便以及用Al-WTR改良的施有粪便的土壤中形成表面络合物。
