Influence of solution and operating conditions on the treatment of aquaculture wastewater using direct contact membrane distillation: Ammonia rejection and membrane fouling
Influence of solution and operating conditions on the treatment of aquaculture wastewater using direct contact membrane distillation: Ammonia rejection and membrane fouling
复制标题
DOI：
10.1016/j.cej.2023.147326
复制
发表时间：
2023-11
影响因子：
15.1
通讯作者：
Bing Zhang;Jing Shen;Jianhui Xiong;Yu Shen;Wenxin Shi
中科院分区：
文献类型：
--
作者：
Bing Zhang;Jing Shen;Jianhui Xiong;Yu Shen;Wenxin Shi
在循环水养殖中，氨氮是影响水产养殖生物存活的关键因素，如何及时有效地处理氨氮已成为一个必须解决的关键问题。研究了牛血清白蛋白（BSA）浓度、氨水浓度、pH、温度和流速对直接接触膜蒸馏（DCMD）脱氨过程中膜污染和脱氨效率的影响。结果表明，无论溶液中是否存在牛血清白蛋白，氨氮浓度的升高都会导致浓差极化加剧，从而导致氨氮截留率升高，膜污染加剧。此外，发现更有利的氨截留条件包括较低的温度、pH和流速。其中，温度和pH值的变化主要影响氨的溶解度，这两个因素对DCMD的拒氨能力有显著影响。在BSA的存在下，显着的改变，观察到在氨氮和膜污染的排斥。当BSA浓度为5 mg/L时，通过水化力对氨的截留率可达97.5%。pH值的升高导致了一个显着的缓解膜污染，由于静电力的增强。此外，氨浓度，BSA浓度，和DCMD的氨的拒绝之间的强相关性被发现。该研究为今后DCMD在实际氨氮废水处理中的应用和减轻膜污染提供了有价值的见解。
In the context of recirculating aquaculture, the timely and efficient treatment of ammonia nitrogen, which is a key factor influencing the survival of aquaculture organisms, has become a critical issue that must be addressed. This study aimed to comparatively investigate the interactive effects of bovine serum albumin (BSA) concentration, ammonia concentration, pH, temperature, and flow rate on the efficiency and membrane fouling during ammonia rejection by direct contact membrane distillation (DCMD) in the presence or absence of BSA. The results showed that the elevation of ammonia nitrogen concentration, regardless of the presence of BSA in the solution, led to an increase in concentration polarization, resulting in elevated rejection for ammonia nitrogen and aggravated membrane fouling. Moreover, the conditions of ammonia rejection that were found to be more favorable included lower temperature, pH, and flow rate. Among them, temperature and pH change primarily impacted ammonia solubility, which were the two factors with the significant influence on DCMD's ability to reject ammonia. In the presence of BSA, significant alterations were observed in the rejection of ammonia nitrogen and membrane fouling. The inclusion of 5 mg/L BSA resulted in a remarkable 97.5 % rejection of ammonia through hydration force. The elevation of pH led to a notable mitigation of membrane fouling owing to the augmentation of electrostatic force. Furthermore, a strong correlation was found between ammonia concentration, BSA concentration, and DCMD's rejection of ammonia. This study provides valuable insights for the future implementation of DCMD in treating actual ammonia wastewater and mitigating membrane fouling.