复合改性膨润土对氨氮废水的吸附及脱附
Adsorption and desorption of ammonia-nitrogen wastewater by modified bentonite
-
摘要: 为了研究氨氮的吸附及脱附机理，使用了SDS（十二烷基硫酸钠）和AlCl3·6H2O（六水合三氯化铝）复合改性制备的改性膨润土对氨氮废水进行吸附及脱附性能研究。首先通过改性膨润土对含氨氮废水的吸附动力学实验和等温吸附实验研究膨润土的吸附过程，再利用KCl作为脱附剂，对吸附饱和的膨润土进行脱附再生，使用再生的脱附膨润土复合材料进行吸附实验。实验表明，动力学实验中，准二级动力学方程能够更好的模拟氨氮废水的吸附过程，Langmuir模型和Freundlich模型均能拟合氨氮的吸附过程，但综合评价，选用Freundlich等温方程式。脱附剂KCl溶液pH为3、浓度为550 mg·L-1时，搅拌速度为250 r·min-1，室温下搅拌20 min，吸附饱和膨润土能够很好地脱附，脱附率达到75.21%。再生的复合膨润土材料对氨氮的去除率为62.83%。Abstract: To identify the mechanism of ammonia nitrogen adsorption and desorption,the adsorption/desorption of ammonia nitrogen in wastewater by bentonite modified with a composite of sodium dodecyl sulfate (SDS)and AlCl3·6H2O (SDS-Al-B) was investigated. First,the kinetics and isothermal adsorption of ammonia nitrogen by SDS-Al-B was studied. Then,the desorption of saturated bentonite was conducted using KCl as the desorption agent. Finally,adsorption experiments were conducted using the regenerated composite bentonite material. Based on the results of the kinetics experiment,the pseudo-second-order kinetics model can better simulate the adsorption process than the pseudo-first-order kinetics model. In the adsorption isotherm experiment,the Langmuir model and Freundlich model provide good fittings,but a comprehensive evaluation reveals that the Freundlich model is better. For a 550 mg·L-1 KCl solution at pH 3 and stirring at 250 r·min-1 for 20 min at room temperature,a very high desorption level (75.21%) was observed. The removal rate of ammonia nitrogen was 62.83% when using the regenerated composite bentonite materials.
-
-
[1] 上海市环境保护局. 废水物化处理[M]. 上海:同济大学出版社,1999 [2] 聂锦旭,刘汨,刘立凡. 微波强化铝改性膨润土对水中氨氮的吸附性能[J]. 金属矿山,2009(12):142-145 [3] ZHU Runliang,ZHU Lizhong,ZHU Jianxi,et al. Sorption of naphthalene and phosphate to the CTMAB-Al13 intercalated bentonites[J]. Journal of Hazardous Materials,2009,168(2/3):1590-1594 [4] GUO Jianzhong,CHEN Shunwei,LIU Li,et al. Adsorption of dye from wastewater using chitosan-CTAB modified bentonites[J]. Journal of Colloid and Interface Science,2012,382(1):61-66 [5] 邵红,刘相龙,李云姣,等. 阴阳离子复合改性膨润土的制备及其对染料废水的吸附[J]. 水处理技术,2015,41(1):29-34 [6] 莫晓余,程培夏,许银,等. 微波改性膨润土吸附-PAM混凝联用技术处理冶炼废水中的重金属[J]. 水处理技术,2013,39(7):84-88 [7] 邵红,张志芳. CTMAB/CPAM/膨润土复合材料的制备与应用[J]. 环境科学与技术,2014,37(7):117-123 [8] 王雅萍,刘云,董元华,等. 改性膨润土对氨氮废水吸附性能的研究[J]. 应用化工,2011,40(7):1148-1152 [9] 聂锦旭,肖贤明,刘立凡. 改性膨润土吸附废水中氨氮的试验研究[J]. 非金属矿,2006,29(1):43-45 [10] 陈岩,赵静,闫良国. 改性膨润土吸附去除水中氨氮的实验研究[J]. 环境科技,2009,22(4):1-3 [11] 赵娇娇. 羟基铝柱撑膨润土处理氨氮废水的实验研究[D]. 青岛:青岛科技大学,2013 [12] 周强,段钰锋,冒咏秋,等. 活性炭汞吸附动力学及吸附机制研究[J]. 中国电机工程学报,2013,33(29):10-17 [13] 卢守青,王亮,秦立明. 不同变质程度煤的吸附能力与吸附热力学特征分析[J]. 煤炭科学技术,2014,42(6):130-135 [14] 刘秀梅,张夫道,冯兆滨,等. 风化煤腐殖酸对氮、磷、钾的吸附和解吸特性[J]. 植物营养与肥料学报,2005,11(5):641-646 [15] 姜霞,王秋娟,王书航,等. 太湖沉积物氮磷吸附/解吸特征分析[J]. 环境科学,2011,32(5):1285-1291 [16] 丁静. 太湖氮磷分布特征及其吸附/解吸特征研究[D]. 南京:南京理工大学,2010 [17] 罗雄兵,冯燕. 膨润土在废水处理中的应用及研究现状[J]. 中国非金属矿工业导刊,2013(5):11-16 [18] 吴奇,刘满平,刘丽红. 内蒙古膨润土处理氨氮废水的研究[J]. 石化技术与应用,2011,29(2):172-175 -
点击查看大图
计量
- 文章访问数: 1918
- HTML全文浏览数: 1568
- PDF下载数: 354
- 施引文献: 0
下载:
