合成多孔性磁性氧化鐵(γ-Fe2O3)於減緩薄膜積垢之研究

Synthesis of porous magnetic iron oxide (γ-Fe2O3) and application in mitigation membrane fouling

李念育(Nien-Yu Lee)

指導教授 ： 游勝傑

中原大學/工學院/生物環境工程研究所/碩士(2013年)

https://doi.org/10.6840/CYCU.2013.00095

摘要

摘要
在廢水處理中使用的薄膜生物反應器最為詬病的一個問題就是積垢問題，而溶解性微生物產物（SMP）是造成積垢的主因，其大部分的組成物為蛋白質、碳水化合物及腐殖酸等。本研究利用水熱合成法製備三種多孔性磁性氧化鐵(γ-Fe2O3)來當作吸附劑來去除SMP，以降低薄膜的積垢，其中利用尿素當作孔洞形成劑製備之γ-Fe2O3，為S1；第二種則是添加孔洞形成劑與分散劑-十六烷基三甲基溴化銨(CTAB)，其命名為S2；S3則是不進行表面的改良。合成後利用磁粉進行吸附批次實驗及薄膜積垢減緩測試。由結果顯示三者吸附量以S1為最佳，其蛋白質吸附結果為83.81mg/g、碳水化合物為357.95mg/g、腐植酸為8.96mg/g；S2的吸附量在蛋白質則為81.9mg/g、碳水化合物為150.9mg/g、腐植酸為16.4mg/g；S3蛋白質吸附量為13.3 mg/g、碳水化合物為60.2 mg/g、腐植酸為2.13 mg/g。另薄膜積垢減緩實驗發現S1對蛋白質、碳水化合物溶液及實廠進出流水的最適添加為0.4克，在腐植酸添加0.1克就有明顯的減緩積垢效果，活性污泥則以0.2克效果較好；S2對蛋白質溶液與活性污泥最適添加為0.2克，碳水化合物溶液及進出流水的最適添加量為0.4克，在腐植酸添加0.1克就有明顯的減緩積垢效果。整體而言，對於減緩薄膜積垢之效果以S1奈米氧化鐵為最適添加劑。

關鍵字

生物積垢 ； 溴化十六烷三甲基銨 ； 三氧化二鐵(γ-Fe2O3) ； 溶解性微生物產物

並列摘要

Abstract
The use of membrane bioreactors (MBR) in wastewater treatment has an obvious limitation –membrane fouling, which is not only reduces process efficiency but also increases operational cost. Soluble microbial products (SMP) is composed of protein, polysaccharide, humic acid and so on, which directly causes membrane fouling. In this study, mesoporous magnetic iron oxide (γ-Fe2O3) was synthesized by hydrothermal synthesis as an adsorbent to remove SMP. The use of urea as a pore-forming agent to prepare γ-Fe2O3,named S1；second is added pore forming agent and dispersant - cetyl trimethyl ammonium bromide (CTAB),which is named S2；S3 is without surface improvement. The magnetic experiments conducted two stages, the first one is adsorption capacity for bovine serum albumin (BSA) and carbohydrate and humic acid were determined in a series of batch tests. The influent, effluent, and sludge from Dihua WWTP and the three pure pollutants were used in the jar test for membrane in the second stage. Among the three adsorbents , S1 show the best adsorption capacity of BSA, carbohydrate and himic acid with values 83.81mg/g, 357.95mg/g, 8.96mg/g respectively.S2 show the adsorption capacity of BSA, carbohydrate, humic acid with values 81.9mg/g,150.9mg/g, 16.4mg/g. S3 show the adsorption capacity of BSA, carbohydrate, humic acid with values 13.3 mg/g, 60.2 mg/g, 2.13 mg/g. In this study membrane test adding 0.4g of S1 showed the best result for BSA and alginate, humic acid have significantly slowed fouling effect was added over 0.1g S1. Flowing in and out of the real plant is better to add 0.4g, sludge is better to add 0.2g. S2 optimum addition of BSA solution was 0.2 g, carbohydrates optimal solution add 0.4g. In humic acid added over 0.1g already significantly slowed fouling effect. Flowing in and out of the real plant dosage 0.4g is better, in activated sludge added 0.2g is better. In this operating condition obviously slow individually fouling effect In preliminary tests maghemite have recoverability which was around 92% can be separated from water through magnet in as quickly as 10 mins. Overall, for the membrane fouling test maghemite S1 is the best adsorbent for this study.

並列關鍵字

soluble microbial products(SMP) ； fouling ； Membrane bioreactor(MBR) ； CTAB ； iron oxide(γ-Fe2O3 )

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