CALAGUA, Unidad Mixta UV-UPV, Institut Universitari d'Investigaciò d'Enginyeria de l'Aigua i Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera s/n, 46022, Valencia, Spain.
CALAGUA, Unidad Mixta UV-UPV, Institut Universitari d'Investigaciò d'Enginyeria de l'Aigua i Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera s/n, 46022, Valencia, Spain.
J Environ Manage. 2024 Nov;370:122719. doi: 10.1016/j.jenvman.2024.122719. Epub 2024 Oct 8.
Anaerobic membrane bioreactor (AnMBR) technology has great advantages for treating urban wastewaters, but, when irrigation cannot be applied and the effluent is discharged in a sensitive zone, a post-treatment of this effluent is needed for nitrogen and phosphorus removal. Under this scenario, ion exchange processes represent one of the most promising technologies for treating this effluent. Ion exchange technology allows to meet discharge limits and to recover these nutrients in a highly concentrated stream. In this work, the technical feasibility of using a commercial resin for phosphorus recovery and a natural zeolite (clinoptilolite) for nitrogen recovery was evaluated. Purolite FerrIX A33E resin removed phosphate from the AnMBR permeate within 500 Bed Volumes (BVs) with a maximum adsorption capacity (q) of 2,1 mg P-PO/g resin. Regeneration of the resin (2% NaOH 2% NaCl) recovered over 95% of the phosphorous retained, achieving a concentration of 316,7 mg P-PO/L in the regeneration solution. In the absence of a long-term study, the resin showed a stable adsorption capacity during 16 cycles of saturation-regeneration. Clinoptilolite removed nitrogen within 139 BVs obtaining a q of 3,68 mg N-NH4/g zeolite. 97 % of the retained N-NH was recovered in the regeneration stage (0,8% NaOH) with an average concentration of 577 mg N-NH/L. Continuous exposure of the zeolite to alkaline solutions led to reduction of 50% of the adsorption capacity after 17 cycles.
厌氧膜生物反应器（AnMBR）技术在处理城市污水方面具有很大的优势，但是，当不能进行灌溉且出水在敏感区域排放时，需要对这种出水进行氮磷去除的后续处理。在这种情况下，离子交换过程代表了处理这种出水的最有前途的技术之一。离子交换技术可用于满足排放限值，并以高浓度流回收这些养分。在这项工作中，评估了使用商业树脂回收磷和天然沸石（斜发沸石）回收氮的技术可行性。Purolite FerrIX A33E 树脂在 500 床体积（BV）内从 AnMBR 渗滤液中去除磷酸盐，最大吸附容量（q）为 2.1mg P-PO/g 树脂。（2%NaOH+2%NaCl）对树脂的再生回收了超过 95%的磷，使再生液中的磷浓度达到 316.7mg P-PO/L。在没有长期研究的情况下，树脂在 16 个饱和-再生循环中显示出稳定的吸附能力。斜发沸石在 139BV 内去除氮，得到 3.68mg N-NH4/g 沸石的 q 值。在再生阶段（0.8%NaOH）回收了 97%的保留氮，平均浓度为 577mg N-NH/L。沸石连续暴露于碱性溶液中，在 17 个循环后，吸附能力降低了 50%。
