Various techniques have been used to “clean-up” wet-process phosphoric acid such as precipitation, flotation and adsorption. To address the potential of membrane processes in the phosphoric acid clarification process, this study explores the benefits of membrane techniques as a green separation technique for phosphoric acid clarification in an eco-efficient way through the use of recycling spent reverse osmosis membrane. Regenerated membrane was used to study the phosphoric acid clarification at a laboratory scale. They were immersed in an oxidizer for at most seven days. The samples were characterized systematically before immersion in an oxidant media. In this study, the potential to regenerate spent membranes and application of this media to clarify the 29% P₂O₅ phosphoric acid was demonstrated. This study shows, through experiments, that the reverse osmosis (RO) membranes could achieve a rejection of 70% and 61% for suspended solid and organic matter, respectively. These promising results will pave the way for implementation of these membranes in phosphoric acid treatment. Moreover, besides being economically advantageous, the use of the spent membrane is likely an environmentally friendly route (no waste, no organic solvent and effluent to be regenerated later on).

中文翻译：

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废反渗透膜回收再利用，用于湿法磷酸的澄清

各种技术已被用于“净化”湿法磷酸，例如沉淀、浮选和吸附。为了解决膜工艺在磷酸澄清过程中的潜力，本研究探讨了膜技术作为一种绿色分离技术的好处，通过使用回收废反渗透膜，以生态高效的方式进行磷酸澄清。再生膜用于研究实验室规模的磷酸澄清。将它们浸入氧化剂中最多7天。在浸入氧化剂介质之前对样品进行系统表征。在这项研究中，再生废膜的潜力和应用该介质澄清 29% P ₂ O ₅证明了磷酸。本研究通过实验表明，反渗透 (RO) 膜对悬浮固体和有机物的截留率分别为 70% 和 61%。这些有希望的结果将为在磷酸处理中实施这些膜铺平道路。此外，除了经济上的优势外，废膜的使用可能是一种环境友好的途径（无废物、无有机溶剂和后续再生的流出物）。