|標題:||可同時硝化及脫硝之自營性薄膜生物反應槽之研發及其菌群結構分析(2/2)||作者:||曾四恭||關鍵字:||硝化;脫硝;自營性;薄膜生物反應槽;菌相分析;Nitrification;Denitrification;Membrane bioreactor;Autotrophic;Bacterial community analysis||公開日期:||31-七月-2004||出版社:||臺北市：國立臺灣大學環境工程學研究所||摘要:||經本研究之結果證實，利用PVA-褐藻膠共聚包埋法將硝
To develop a laboratory-scale autotrophic membrane-immobilized biofilm reactor to remove nitrogen from drinking water. A PVA-immobilized biofilm, attached to the surface of a silicone tube, was used as the basis of a bioreactor for simultaneous nitrification and denitrification of water. The bioreactor was aerated with air to supply oxygen for nitrification and pure hydrogen was supplied to the silicone tube and diffused through the membrane wall to feed the biofilm for autotrophic denitrification. The bioreactor was effective for the simultaneous nitrification and denitrification of water after a short period of acclimation, while the biofilm exhibited good resistance to the inhibition of denitrification by dissolved oxygen; the denitrification rate decreased by only 8 % as the dissolved oxygen increased from 2 mg/l to saturation. By using PVA crosslinked with sodium nitrate to entrap nitrifying and denitrifying sludge on the surface of a silicone tube, a novel bioreactor for simultaneous nitrification and denitrification was developed. In addition to performing as an immobilizing agent to strengthen the biofilm, PVA protected the denitrifying microorganisms to reduce the inhibition by dissolved oxygen under aerobic condition. Therefore, nitrification and denitrification occurred simultaneously within the biofilm. Furthermore, the immobilization technique shortened the acclimation period of the bioreactor. In addition, the genera Xanthomonas and Thauera dominated the inner layer of the biofilm, while Nitrospira dominated the outer layer of the biofilm.
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