SM2在2种基质中去除的影响因素

Factors influencing removal of sulfamethazine in two substrates

研究了磺胺二甲基嘧啶(SM2)在草甸土(MS)、赤红壤(LRS)2种基质中随时间的浓度变化,分析了微生物、阳离子和pH等影响因素对去除效果的影响及机理。在3组实验条件下进行振荡培养实验:(a)灭菌与未灭菌;(b)添加不同类型和强度的金属阳离子;(c)不同pH值。实验结果表明,SM2在MS中30 d的去除率(85.4%)高于在LRS中的去除率(70.0%);在灭菌的MS和LRS基质中30 d的去除率分别达到37.5%和32.5%;随着离子强度的增加和离子价态的增高,SM2在MS和LRS中去除量相应减少;接触反应1 d后,pH=5时2种基质对SM2的去除量最大,pH>7时SM2的去除量迅速下降,pH=9时SM2在MS和LRS中的去除率与pH=5时相比分别减少13.7%和12.1%。

The concentrations of sulfamethazine （SM2） in meadow soil （MS） and lateritic red soil （LRS） were monitored and their removal dynamics were studied. The influences of microorganism, ions, pH value in each substrate on removal of SM2 and their mechanisms were studied too. Shaking culture tests were carried on under three groups of experimental conditions： （a） unsterilized and sterilized substrates, （b） different types and concentrations of metal cations added substrates, （c） different pH substrates. The experimental results showed that more SM2 was removed in MS（85.4% ） than in LRS（70. 0% ） by the 30th day. The removal rates in sterilized MS and LRS reached 37.5% and 32. 5% , respectively by the 30th days. The removal rates of SM2 grew down when more ions and highly charged ions were added in two substrates. After contacted reaction sustained for 24 hours, the highest removal rates of SM2 were found at pH 5 in two substrates. The removal rates decreased rapidly at pH 〉7. and were down by 13.7% and 12. 1% in MS and LRS respectively at pH 9 compared with those at DH 5.