Removal of boron from gas field wastewater by Zn/Mg/Al-layered double hydroxides

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Wang, Min^1

Sichuan Branch of China International Energy Holdings Limited, Sichuan Province, Chengdu, 610065, China^1

关键词: Adsorption conditions;    Adsorption process;    Calcination temperature;    Coprecipitation method;    Langmuir isotherm;    Removal efficiencies;    Response surface methodology;    Second order kinetics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/2/022031/pdf
DOI  :  10.1088/1755-1315/237/2/022031

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The presence of boron in gas field wastewater poses a serious risk to human and ecosystem health. Zn/Mg/Al-layered double hydroxides (LDHs) were synthesized by the co-precipitation method and used for boron removal from gas field wastewater. The adsorption conditions were optimized by response surface methodology (RSM) based on the Box-Behnken (BBD) method. The highest removal efficiency achieved was approximately 68% when the Zn/Mg/Al LDHs adsorbent was prepared with a Zn/Mg/Al molar ratio of 2.6:0.4:1 and calcination temperature of 773 K. The maximum removal efficiency was obtained under a temperature, time, dosage and pH of 10 °C, 4.8 h, 15 g L-1 and 5.0, respectively. The results of boron adsorption were fitted to a Langmuir isotherm, achieving an R2 = 0.9633, and the adsorption process followed second-order kinetics.