Ammonia Nitrogen Wastewater Treatment by Modified Coal Fly Ash
This study investigated the modification of coal fly ash with hydroxide as an alkali source by means of hydrothermal synthesis with alkalinizing calcination.The resulting product was characterized by scanning electronic microscopy,Fourier transform infrared spectrometry,X-ray powder diffraction,and Brunauer-Emmett-Teller analysis.The modified coal fly ash was further used as an adsorbent in ammonia nitrogen-containing wastewater to test its adsorption property.Results showed that the smooth surface of the coal fly ash became rough and porous after modification and several zeolite-type minerals were produced.The specific surface area of the particles increased from 0.15 m2·g-1 to 270 m2 g-1.The adsorption experiment showed that the modified coal fly ash may serve as a favorable adsorbent.Optimal experimental conditions included pH=6 and dosage of modified coal fly ash=2g -L-1.The isothermal adsorption observed conformed to Langmuir adsorption isotherms,which indicates that adsorption using the modified coal fly ash features a type of monolayer adsorption.The maximum adsorption quantity of ammonia nitrogen on the modified coal fly ash was 138.89mg-g-1.Kinetics test data conformed to a pseudo-second-order equation,which indicates that chemical adsorption is the rate-controlling step.
Song Huiping Zheng Nan Guo Yanxia Cheng Huaigang Cheng Fangqin
Institute of Resources and Environment Engineering, State Environment Protection Key Laboratory of Efficient Utilization of Coal Waste Resources, Shanxi University, Taiyuan 030006, China
国际会议
2013青岛国际脱盐大会(Qingdao International Conference 2013 on Desalination and Water Reuse)
青岛
英文
47-53
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）