水溶性有机质对金霉素在猪粪中吸附-解吸附行为的影响

选择来自猪粪和稻草的水溶性有机质（DOM）,用室内模拟试验方法研究了我国常用抗生素金霉素（CTC）在受到内源和外源DOM作用下在猪粪中的吸附和解吸附行为。研究表明,金霉素能被猪粪便快速吸附,等温线呈非线性,用Freundlich方程可以很好地拟合吸附数据;添加DOM能抑制猪粪对CTC的吸附,其能力大小与加入的DOM种类有关,其中内源性猪粪DOM的解吸附效果明显大于外源性稻草DOM;形成阳离子复合体和加入DOM的性质可能是抑制CTC在猪粪便上吸附的主要机制。

Effect of Dissolved Organic Matter on Chlortetracycline Adsorption and Desorption in Swine Manure

To understand the influence of the adsorption and desorption of antibiotics,the effects of dissolved organic matter（DOM）on chlortetracycline（CTC）adsorption in swine manure were studied.The DOM was endogenous（extracted from the test manure）and exogenous（came from decayed rice straw）.In this study,CTC was adsorpted fast by treated manure,the experimental data was well fitted with the Fre-undlich equation with nonlinear isotherm.The swine manure adsorption of CTC was obviously inhibited by the presence of DOM.The in-hibitive ability was related with the DOM type.The influence of desorption by endogenous DOM was much stronger than that of exogenous DOM in the suggested system.This study implies that the effects of endogenous and exogenous DOM on manure adsorpted adsorption may be related to the CTC-complex cations and DOM characteristic.