Beler-Baykal B, Allar A D
Istanbul Technical University, Department of Environmental Engineering, 34469 Ayazaga, Istanbul, Turkey.
Environ Technol. 2008 Jun;29(6):665-72. doi: 10.1080/09593330801987004.
It had previously been shown that ammonium selective natural zeolite clinoptilolite may be used successfully as an ion exchanger for ammonium removal and nitrogen control from domestic wastewater. The process had been reported to be acceptable either by itself alone or as an upgrade. In this work, the possibility of using clinoptilolite for ammonium removal from fertilizer production wastewater was investigated. The fertilizer plant under consideration was rather a non-typical one with a lower ammonium strength than what is normally expected, and a variable effluent concentration. Batch experiments were performed to assess the capacity of clinoptilolite towards ammonium removal from an industrial wastewater at two different pHs. Flow experiments for the characterization of system behavior under continuous feeding conditions at different contact times were conducted for breakthrough analysis. Both real and simulated fertilizer wastewater samples were investigated and the results have shown that the real one may successfully be represented by the simulated one. Experimental results have shown that surface capacities exceeding 14 mg ammonium g(-1) clinoptilolite could be attained, complete removal of ammonium may be achieved with empty bed contact times of 10 min or higher and ion exchange with clinoptilolite could be used successfully to comply with the effluent standards given for the fertilizer plant.
此前已有研究表明，铵选择性天然沸石斜发沸石可成功用作离子交换剂，用于去除生活污水中的铵并控制氮含量。据报道，该工艺单独使用或作为升级工艺都是可以接受的。在这项工作中，研究了使用斜发沸石去除化肥生产废水中铵的可能性。所考虑的化肥厂相当特殊，铵浓度低于正常预期，且废水浓度可变。进行了批量实验，以评估斜发沸石在两种不同pH值下从工业废水中去除铵的能力。进行了流动实验，以表征在不同接触时间的连续进料条件下系统的行为，用于穿透分析。对真实和模拟的化肥废水样本都进行了研究，结果表明真实样本可以成功地用模拟样本表示。实验结果表明，斜发沸石的表面容量可超过14 mg铵 g(-1)，空床接触时间为10分钟或更长时可实现铵的完全去除，并且使用斜发沸石进行离子交换可成功符合化肥厂规定的废水排放标准。
