镁铝水滑石对砷和阿散酸复合地下水的治理技术与机理

Technology and Mechanism of Treatment of Mg/Al-HTLcs on Wastewater Contaminated by As(Ⅲ)and ASA

研究了碳酸根型镁铝水滑石(Mg/Al-HTLcs)吸附剂对As(Ⅲ)和含砷有机物阿散酸(ASA)复合污染地下水中砷的去除与吸附机理.结果表明:As(Ⅲ)和ASA质量浓度均为10 mg/L时,在25℃、Mg/Al-HTLcs投加量为5 g/L、吸附时间为24 h、pH=7的条件下,砷去除效果最佳,去除率分别为36.02%和70.73%,吸附量分别为2.40 mg/g和4.72 mg/g.Freundlich等温方程能更好地描述吸附过程;动力学研究表明吸附遵循准二级吸附动力学方程,并有非常好的相关性.

The removal and adsorption mechanism of AS(Ⅲ)and arsenic containing organic compound arsanic acid(ASA)from groundwater by carbonate Mg/Al-HTLcs adsorbent were studied.The results showed that when the mass concentration of AS(Ⅲ)and ASA were both 10 mg/L,the dosage of Mg/Al-HTLcs was 5 g/L at 25℃,the adsorption time was 24 h and the pH was 7,the arsenic removal effect was the best.The removal rates were 36.02%and 70.73%,respectively.The adsorption amounts were 2.40 mg/g and 4.72 mg/g,respectively.Freundlich isothermal equation can better describe the adsorption process.The kinetic study shows that the adsorption follows the quasi second-order adsorption kinetic equation and has a very good correlation.