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標題: | 以陶瓷膜應用於微藻膜生物反應槽去除廢水中之氮磷營養鹽 Applying ceramic membrane in algae-based membrane bioreactor to remove nitrogen and phosphorous nutrients from wastewater |
作者: | Tsung-Min Hsieh 謝宗旻 |
指導教授: | 于昌平(Chang-Ping Yu) |
關鍵字: | 微藻膜生物反應槽,陶瓷膜,錯流過濾,藻類固定化,氮磷營養鹽, Algae-based membrane bioreactor,ceramic membrane,crossflow filtration,algae immobilized,nitrate,phosphate, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 以微藻處裡廢水之工藝已被研究與持續發展,將微藻與薄膜生物反應器結合就形成微藻膜生物反應槽,該技術結合了微藻處理與薄膜分離技術之優勢,能高效截留生物質,提高微藻濃度,且膜能夠實現藻體的分離和採收,防止微藻膜生物排入水體,出水質量很高,可以利於水回收再利用。本研究將建構微藻膜生物反應槽並將陶瓷膜應用於該系統,陶瓷膜具有操作壓力範圍廣、耐受pH值範圍大、低阻塞潛勢與操作壽命長等優勢,其操作模式為錯流過濾,另外找出有效清除藻類於陶瓷膜上產生阻塞的方法。將陶瓷膜應用於微藻膜生物反應槽後,將加入微藻固定化技術,評估固定化微藻於反應槽操作時,是否能有效減輕薄膜阻塞,並了解固定化是否對藻類去除氮磷營養鹽能力有所影響。
本研究挑選四種藻種:羊角月牙藻、雨生紅球藻、四尾柵藻、小球藻,合成廢水批次式試驗結果顯示雨生紅球藻與四尾柵藻於人工合成二級出流廢水中,在相同數量下,去除營養鹽能力大於羊角月牙藻與小球藻,而固定化亦可提升此兩藻類的去除效率,雨生紅球藻對氮、磷營養鹽去除效率分別提升至74.23 ± 11.19%與37.38 ± 16.55%,四尾柵藻則為39.08 ± 3.22%與37.65 ± 10.72%。而在BG11培養基與人工合成二級出流廢水中,四尾柵藻生長速率均高於雨生紅球藻,為同時評估藻類於反應槽內生長狀況與造成薄膜阻塞情事,且有效降解廢水中的營養鹽,故宜挑選四尾柵藻於微藻膜生物反應槽中運行。本研究所使用之非在線清洗方式相比於化學反洗、化學反洗加正洗、單純正洗清理方式,能有效回復藻類於陶瓷膜造成之阻塞,經三次試驗回復率均達到99%。藻類固定化技術可有效將藻類停留與反應槽中,並防止藻類直接與陶瓷膜接觸,在連續流試驗自由藻類造成薄膜通量下降百分比為38.65%,而經固定化後可減輕為29.15%。透過增加連續流試驗中之藻類數量,可有效提升氮磷營養鹽去除效率,連續流固定化組別藻類濃度後期達到1754 MLSS mg/L,氮去除率達到63.45 ± 1.92%,磷去除率則為58.44 ± 4.72%。 The Algae-Membrane Bioreactor (A-MBR) was proposed and studied nowadays. The A-MBR can rise the biomass of microalgae efficiently and the quality of effluent. The ceramic membrane is used for A-MBR in this study. We try to find out the most efficient cleaning method for cleaning algae fouling on ceramic membrane. The algae immobilized will also test in A-MBR, we expect that immobilized can reduce the algae fouling. Chlorella vulgaris, Pseudokirchneriella subcapitata, Scenedesmus quadricauda and Haematococcus pluvialis were chose and cultivated in BG11 medium, In artificial wastewater (AWW) batch test, For free type, nitrate removal efficiency for four algae were similar. And S. quadricauda was the highest (23.06 ± 1.75%). For immobilized type, highest nitrate removal efficiency was 74.23 ± 11.19% of H. pluvialis, and S. quadricauda had the highest phosphate removal efficiency for 37.65 ± 10.72%. After that, leakage counting test showed that Chlorella vulgaris had the highest percentage for 1.3 ± 0.3%. The number of algae leakage was quiet low. Three cleaning method was tested in A-MBR. Results showed that offline cleaning method could fully recover the flux for triplicate trial. For flux declining batch test of A-MBR, results showed that flux reduction percentage for free and immobilized algae were 41.5 ± 14.01%、33.7 ± 0.89%. Flux reduction for Immobilized algae was less than free algae. For continues mode A-MBR in immobilized type, nitrate and phosphate removal efficiency were 18.69 ± 6.52% and 19.07 ± 6.84%. To improve the nutrient removal efficiency in A-MBR, the bioreactor was modified and raised the number of algae to 1754 MLSS mg/L. Afterward, nitrate and phosphate removal efficiency was 63.45 ± 1.92% and 58.44 ± 4.72%. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71018 |
DOI: | 10.6342/NTU201802306 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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