阳离子聚（聚乙烯醇-共-乙烯）纳米纤维膜快速去除液态奶牛粪便中的硝酸盐。
Rapid removal of nitrate from liquid dairy manure by cationic poly (vinyl alcohol-co-ethylene) nanofiber membrane.
机构信息
Department of Biological and Agricultural Engineering, University of California, Davis, USA; Polymeric Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt; Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, California, USA.
Department of Biological and Agricultural Engineering, University of California, Davis, USA; Polymeric Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt.
出版信息
J Environ Manage. 2021 Mar 15;282:111574. doi: 10.1016/j.jenvman.2020.111574. Epub 2020 Nov 10.
Elevated levels of nitrate in surface water is a leading concern, which impacts human and animal health, and controlling it requires improved and sustainable methods capable of removing nitrate anions from source waste water to reduce nitrate anions transport to environment. In liquid dairy manure, nitrogen content can vary from 200 to 600 ppm and the transport of manure nitrogen into ambient water through hydrologic processes has a potential to exceed the maximum contaminant level limit (10 ppm) of nitrate nitrogen for regulated public water systems. Dairy manure is considered as a reservoir of nitrate. This research investigates on the determination of optimal designing of nanofiber membrane to remove nitrate anions from liquid dairy manure. A cationic poly (vinyl alcohol-co-ethylene) nanofiber membrane (EVOH) NFM was grafted via UV with 2-(methacryloyloxy) ethyl trimethylammonium chloride (DMAC) monomers. The adsorption efficiency of nitrate by the membrane was determined on liquid manure of dairy lagoons located in Central Valley of California. Initial nitrate concentrations in dairy manure varied from 75 to 100 ppm. Results showed that nitrate in dairy water was removed by 70% in 40 min. Tortuous structure and chemical stability of membrane resulted in nitrate dynamic binding capacity of 40 mg g. Furthermore, it exhibits efficient reusability without significant changes in its performance using 0.5 M sodium hydroxide solution for nitrate desorption. Results showed that change in pH, and multi-anion conditions had limited effects on nitrate removal efficiency, and EVOH NFM can be a viable option to remove nitrate of liquid manure. This could be used for mitigating transport of excess nitrate from manure to environment. Overall, the results suggest that EVOH-g-DMAC NFM is efficient, low-cost (13 USD/m) and recyclable material for sustainable removal of nitrate from dairy manure wastewater without requiring any ionic strength or pH adjustment.
地表水中硝酸盐含量升高是一个主要关注点，它会影响人类和动物的健康，控制硝酸盐需要改进和可持续的方法，能够从源废水去除硝酸盐阴离子，以减少硝酸盐阴离子向环境的迁移。在液态奶牛粪肥中，氮含量可能在 200 到 600ppm 之间，通过水文过程将粪肥氮输送到环境水中，有可能超过受监管公共供水系统硝酸盐氮的最大污染物水平限制（10ppm）。奶牛粪肥被认为是硝酸盐的储存库。本研究旨在确定最佳设计纳米纤维膜以去除液态奶牛粪肥中的硝酸盐阴离子。通过 UV 将阳离子聚（乙烯醇-co-乙烯）纳米纤维膜（EVOH）与 2-（甲基丙烯酰氧基）乙基三甲基氯化铵（DMAC）单体接枝。通过膜对加利福尼亚中央山谷奶牛泻湖中的液态粪肥进行了硝酸盐吸附效率的测定。奶牛粪肥中的初始硝酸盐浓度在 75 到 100ppm 之间。结果表明，在 40 分钟内，奶牛水中的硝酸盐去除率达到 70%。膜的曲折结构和化学稳定性导致硝酸盐动态结合能力为 40mg g。此外，使用 0.5M 氢氧化钠溶液进行硝酸盐解吸时，其性能没有明显变化，表现出高效的可重复使用性。结果表明，pH 值和多阴离子条件对硝酸盐去除效率的影响有限，EVOH-g-DMAC NFM 是一种从液态粪肥中去除硝酸盐的可行选择。这可以用于减少粪肥中多余硝酸盐向环境的迁移。总的来说，研究结果表明，EVOH-g-DMAC NFM 是一种高效、低成本（13 美元/m）和可回收的材料，可用于从奶牛粪肥废水中可持续去除硝酸盐，而无需进行任何离子强度或 pH 调整。
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