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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/3412


    Title: 利用Fe3O4磁性奈米顆粒處理砷化鎵研磨廢水;Magnetic-Seeding Aggregation of Nanoparticles from GaAs Grinding Wastewater
    Authors: 邱彥斌;Yan-pin Chiu
    Contributors: 環境工程研究所碩士在職專班
    Keywords: 磁性顆粒;磁種凝聚;砷化鎵研磨廢水;magnetite;arsenic grinding wastewater;magnetic seeding aggregation
    Date: 2009-07-04
    Issue Date: 2009-09-21 12:15:47 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 一般處理砷化鎵研磨廢水須添加大量混凝劑,並且會產生大量污泥,而所添加之混凝劑無法再次利用,因而提高廢水處理成本及環境上之負荷,由於市售的磁性顆粒粒徑較大,單位重量所含的顆粒數較少,基於成本及處理效率的考量,本研究群前期已利用自行製備的氧化鐵奈米顆粒(Fe3O4)。 利用合成的Fe3O4磁性奈米顆粒處理實廠的砷化鎵研磨廢水,以Fe3O4磁性顆粒與研磨廢水中的砷化鎵顆粒於不同的條件下,對濁度及總懸浮固體物去除之影響,如pH值、劑量,且利用Fe3O4顆粒具有磁性的特性,靜置於1000 Gauss外加磁場下以提升處理效率,並利用回收再利用氧化鐵磁性污泥,藉以延長氧化鐵顆粒再處理砷化鎵研磨廢水的能力及減少廢水處理成本。由實驗結果發現,在操作條件控制在pH=7時,濁度及總懸浮固體物去除效率為最佳,可達到98 %,而Fe3O4劑量控制在0.145 g 的Fe3O4量最佳,濁度為2.96 NTU,砷濃度為1 mg/L。以SDS 溶液處理氧化鐵砷化鎵污泥後,可連續處理10次砷化鎵研磨廢水,其濁度為76.5 NTU,SS去除效率95.4 %,累積去除的SS重為5.622 g/L。Fe3O4磁性顆粒操作成本低於混凝處理法,數次Fe3O4磁性顆粒回用分離處理操作成本則可降低至110.5元/m3,低於混凝處理法之操作成本141.3元/m3。 利用磁種凝聚作用將廢水中的砷化鎵顆粒與磁性奈米顆粒(Fe3O4) 碰撞凝聚,不僅只受到重力的沈降,也受到磁力的作用使得去除率提高且沈降也更快速,且投入的氧化鐵顆粒可回收再利用於廢水處理系統中,因此對於砷化鎵研磨廢水的處理,可說是發展了一個操作簡單、快速、減少廢水處理成本及污泥產生量的處理程序。 Magnetic seeding aggregation has been developed to remove GaAs nanoparticles from GaAs grinding wastewaters. Since the number of particles per unit weight of the commercial magnetite is very small due to its large size; therefore, magnetite nanoparticles are required to have efficient removal efficiency of theturbidity. In this study,the recovery of magnetite nanoparticles by different types and concentrations of surfactants. Synthesized magnetite nanoparticles were then used in the magnetic seeding aggregation of GaAs grinding wastewaters. Influences of solution pH, dasage on the removal efficiency of GaAs nanoparticles were examined, and application of an external magnetic 1000 Gauss field during sedimentation. Experimental results showed that when the solution pH = 7, the removal efficiency of the turbidity is the highest, which is about 98 %, Fe3O4=0.145 g have efficient removal efficiency of theturbidity is 2.96 NTU, As=1 mg/L. When magnetite-GaAs nanoparticles aggregates settled down in an external magnetic field, besides gravity, they also experienced magnetic forces, which enhance the settling velocity. Hence, high removal efficiency could be achieved in a much shorter time.
    Appears in Collections:[環境工程研究所碩士在職專班] 博碩士論文

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