Xia Bo, Chen Honghao, Wang Juntao, Pan Xiaocheng
Department of Biological Environment, Jiyang College of Zhejiang A&F University, Zhuji, China.
iScience. 2024 Dec 19;28(1):111645. doi: 10.1016/j.isci.2024.111645. eCollection 2025 Jan 17.
Freshwater pearl farming in China generates wastewater high in ammoniacal nitrogen (NH₃-N) posing environmental threats. This study explores the use of coal fly ash (CFA), an industrial waste, to synthesize A-type zeolite for effective NH₃-N removal from pearl farming wastewater. The zeolite was prepared via pickling pretreatment and hydrothermal methods, resulting in a material with favorable adsorption properties, including cubic and spherical microstructures, a specific surface area of 17.5 m/g, an average pore size of 10.7 nm, and a pore volume of 0.03 cm³/g. Adsorption experiments showed that NH₃-N removal followed kinetics and fit the isotherm model. Applied to actual wastewater, the zeolite achieved a 74% removal efficiency at a dosage of 70 g/L. This approach converts CFA into a valuable adsorbent, reducing its environmental impact, and enhances the sustainability of freshwater pearl farming through effective wastewater treatment, and demonstrates the potential of transforming industrial waste into functional materials for environmental remediation.
中国的淡水珍珠养殖产生的废水中氨氮（NH₃-N）含量很高，对环境构成威胁。本研究探索利用工业废料粉煤灰（CFA）合成A型沸石，以有效去除珍珠养殖废水中的NH₃-N。通过酸洗预处理和水热法制备了该沸石，得到了一种具有良好吸附性能的材料，包括立方和球形微观结构、比表面积为17.5 m/g、平均孔径为10.7 nm、孔体积为0.03 cm³/g。吸附实验表明，NH₃-N的去除遵循动力学并符合等温线模型。将该沸石应用于实际废水，在投加量为70 g/L时，去除效率达到74%。这种方法将CFA转化为有价值的吸附剂，减少了其对环境的影响，并通过有效的废水处理提高了淡水珍珠养殖的可持续性，展示了将工业废料转化为用于环境修复的功能材料的潜力。
