改性人造沸石处理含黄玉铬洁(Ⅵ张焕)祯地下水的实验研究  

EXPERIMENT STUDY ON TREATMENT OF CHROMIUM(Ⅵ)-CONTAINING GROUNDWATER BY MODIFIED ARTIFICIAL ZEOLITE

作　　者：黄玉洁[1] 张焕祯[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《环境工程》2012年第4期1-3,35,共4页Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项--南水北调中线总干渠水质安全保障关键技术与工程示范课题(2009ZX07212-003)

摘　　要：为了提高人造沸石对地下水中铬(Ⅵ)的去除能力,采用氯化铝对人造沸石进行改性。确定最佳改性条件:20%氯化铝溶液,液固比12 mL/g,室温下以180 r/min振荡改性8 h;最佳除Cr(Ⅵ)条件:pH值为4～8,液固比为33.3 mL/g,室温下水浴恒温振荡2 h。改性沸石对铬(Ⅵ)的吸附符合Langmuir及Freundlich等温线方程,由Langmuir吸附等温线可得其吸附容量为5.624 mg/g。在最佳反应条件下,水样中铬(Ⅵ)浓度可由5 mg/L下降到0.026 mg/L,低于0.05 mg/L,满足GB/T 14848—93《地下水环境质量标准》Ⅲ类标准。In order to improve the removal ability of hexavalent chromium on the synthetic zeolite, the synthetic zeolite was modified by AlCl3. It shows that the optimum modification conditions are as follows： 20% of aluminum chloride, 12 mL/g of solid-to-liquid ratio, 180 r/min of the oscillation speed, under room temperature for 8 h. The results show that the concentration of Cr（ Ⅵ ） can be reduced from 5.0 mg/L to 0. 026 mg/L by using modified zeolite in a liquid-to-solid ratio of 33.3 mL/g, pH 4 - 8 under a room temperature for 2 h, which meets the requirements of the third-order of ＂Groundwater Environmental Quality Standards＂ （ GB/T 14848--93 ）. The adsorption of Cr（ Ⅵ ） on the modified zeolite can be described by the Langmuir and Freundlich adsorption isotherm, and the adsorption capacity is 5. 624 mg/g according to the Langmuir adsorption isotherm.

关 键 词：人造沸石 氯化铝 铬(Ⅵ) 地下水 

分 类 号：R123.1[医药卫生—环境卫生学]