Removal of Phosphate in Waste Water by Hydrothermal Synthesis Zeolite from Coal Fly Ash
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摘要:
以粉煤灰为原料，采用水热法合成了低成本的P型沸石吸附剂，运用X射线衍射仪（XRD）、扫描电镜（SEM）和X射线能谱仪（EDAX）等手段对粉煤灰及合成沸石进行了系统表征，并通过静态吸附实验，探究了不同合成时间、碱液浓度及合成温度等条件得到的合成沸石对含磷废水中磷吸附效果的影响。结果表明，水热合成过程中，粉煤灰颗粒失去其原有形态，并在产物中出现P型沸石、羟基方钠石或八面沸石的晶体，且合成时间越长沸石晶体的结晶程度越好、表面也越粗糙。碱液浓度或合成温度越低，越不利于沸石吸附剂的合成。在合成时间8 h、碱液浓度1 mol/L、合成温度120 ℃的条件下，合成沸石产品处理初始浓度为5 mg/L模拟废水，其对磷的去除率可达30.1%。
Abstract:In this paper, the coal fly ash was used as the main raw material, and the low-cost P-type zeolite adsorbent was synthesized through the hydrothermal process.The coal fly ash and synthetic zeolite were systematically characterized by means of X-ray diffraction (XRD), scanning electronic microscope (SEM), and energy-dispersive X-ray analysis (EDAX). The effects of synthetic zeolites obtained at different conditions such as synthesis time, alkali concentration, and temperature on the phosphorus content of simulated phosphorus-containing wastewater was investigated through single-factor static adsorption experiments.The results show that during hydrothermal synthesis, the coal fly ash particles will lose their original form, and P-type zeolite, hydroxy-sodalite or faujasite crystals will be found in the synthesis products. The longer the synthesis time is, the better the crystallinity of the zeolite crystal and the rougher the surface are. The lower the alkali concentration or the synthesis temperature are, the more unfavorable for the synthesis of zeolite adsorbent is. At the conditions of synthesis time of 8 hours, alkali concentration of 1 mol/L, and synthesis temperature of 120 °C, the synthetic zeolite product was treated with an initial concentration of 5 mg/L simulated wastewater, and its removal rate of phosphorus could reached 30.1%.
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Key words:
- coal fly ash /
- synthetic zeolite /
- phosphorus removal /
- adsorption /
- wastewater treatment
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表 1 试样多元素分析结果 单位：%
Table 1. Results of elemental analysis of the samples
SiO2 Al2O3 Fe2O3 CaO MgO K2O Others Si/Al 46.54 34.88 6.77 5.04 0.60 0.46 5.71 1. 18 
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