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Journal AWWA - Removing Trace Organics by Reverse Osmosis Using Cellulose Acetate and Polyamide Membranes AWWA期刊-使用醋酸纤维素和聚酰胺膜通过反渗透去除微量有机物
发布日期: 1986-04-01
对配备有传统醋酸纤维素(CA)膜的全尺寸(8立方英尺/秒)反渗透(RO)水处理厂和配备有聚酰胺(PA)膜的两个中试反渗透(RO)厂进行了去除总有机碳(TOC)和多种微量有机物的能力测试,包括挥发物、可净化物、中性物、碱、酚、,石灰中的酸澄清了二级市政废水。CA膜对总有机碳的去除率为89%,两种PA膜对总有机碳的去除率为99%。根据化合物的结构特征,如电荷、大小和分支,这三种被测试的膜在不同程度上去除了微量有机物。水回收率为84%时,全尺寸反渗透装置对挥发物、可清洗物和可萃取物的去除范围分别为53-87%、0-100%和73-98%。 被测试的两种膜在排斥微量有机物的能力上存在显著差异。所有的膜都会排斥支化的复杂分子,但对于较小的分子,如氯化溶剂,它们的排斥特性各不相同。后一组被聚酰胺膜不同程度地排斥,但通过醋酸纤维素膜。通过比较不同反渗透处理方案和未经反渗透处理方案的累积去除率,评估反渗透在痕量有机物去除中的应用。包括25个参考文献、表格和图表。
A full-scale (8-cubic feet/second) reverse osmosis (RO) water treatment plant equipped with conventional cellulose acetate (CA) membranes, and two pilot RO plants, equipped with polyamide (PA) membranes, were tested for their ability to remove total organic carbon (TOC) and a broad range of trace organics, including volatiles, purgeables, neutrals, bases, phenols, and acids from lime-clarified secondary municipal wastewater. Total organic carbon was removed to the extent of 89 percent by the CA membrane and to 99 percent by the two PA membranes. The three membranes tested removed trace organics to varying degrees, depending on the structural features of the compounds, such as charge, size, and branching. Ranges of removals of volatiles, purgeables, and extractables by the full-scale RO plant at 84 percent water recovery were 53-87 percent, 0-100 percent, and 73->98 percent, respectively. The two membranes tested showed significant differences in their ability to reject trace organics. All membranes rejected branched, complex molecules but varied in their rejection characteristics for smaller molecules, such as chlorinated solvents. The latter group was rejected to a varying degree by polyamide membranes but passed through cellulose acetate membranes. The use of RO for trace organics removal is evaluated by comparing cumulative removals of different schemes with and without RO treatment. Includes 25 references, tables, figures.
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发布单位或类别: 美国-美国给水工程协会
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