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提高MFC產電量及陽極電子傳遞機制的研究
論文作者:童鞋論文網  論文來源:qaly-analyser.com  發布時間:2019/10/29 7:54:37  

摘要:聚醚廢水是洗滌制造業中污染最為嚴重的廢水之一,若直接排放,會大大增加廢水處理負荷及成本,且造成有用資源浪費;目前資源化產品的銷路前景并不樂觀,故急需尋求一種新的資源化方式。化石燃料耗竭與全球氣候變暖問題的日益嚴峻,迫使世界各國高度重視可再生能源的研發,而微生物燃料電池(MFC)是一種利用微生物將化學能直接轉化為電能的新型裝置,可同步實現微生物產電和污水處理,具有廢棄物處置與資源化利用雙重功效。

文章從廢棄資源綜合利用的角度出發,采用聚醚廢水作為陽極液基質,深紅紅螺菌397為催化劑,開發了微生物燃料電池處理聚醚廢水技術。文章系統論述了微生物燃料電池處理聚醚廢水的技術可行性,實驗得出微生物燃料電池的最優運行條件,研究得出微生物燃料電池的陽極電子傳遞機制及各種機制對產電量貢獻度的大小,最后探討了微生物燃料電池陽極改性對提高微生物燃料電池對外產電量的影響,形成較為完整的體系。

采用“雙室”構型的MFC進行以聚醚廢水為陽極液基質的可行性試驗,得到MFC的最優運行條件:pH為6.5,溫度為30℃,攪拌速率為150 r/min~200r/min。微生物燃料電池在最優條件下運行時,微生物燃料電池對企業要求處理的聚醚裝置清洗液(COD為1000 mg/L~2500 mg/L)均有較佳的COD去除效果。

本文詳細探討了微生物燃料電池利用深紅紅螺菌397在處理聚醚廢水時陽極的電子傳遞機制,研究發現陽極的電子傳遞是由直接接觸機制、導電物質介導機制和電子穿梭機制協同完成的,0h~112h內導電物質介導機制對產電量的貢獻度為34.18%,直接接觸機制對產電量的貢獻度為65.82%,電子穿梭機制對產電量的貢獻度為0%。112h~180h內導電物質介導機制對產電量的貢獻度為27.32%,直接接觸機制對產電量的貢獻度為32.03%,電子穿梭機制對產電量的貢獻度為40.65%。

為了加強陽極對外輸出電能,文章對陽極碳氈進行改性探究,在提高MFC的對外輸出電能的同時,也提高了MFC系統的聚醚廢水的COD去除率。用微孔濾膜包裹深紅紅螺菌397修飾陽極碳氈構成微孔濾膜-MFC,用海藻酸鈉包埋漆酶修飾陽極碳氈構成海藻酸鈉-漆酶-MFC,用AQDS通過電聚合-摻雜技術將AQDS鍍在陽極表面,并在陽極室內加入AQDS構成AQDS-CF/PPy/AQDS-MFC。其中微孔濾膜-MFC的對外輸出電能相較于未包型MFC提高了7.82%,COD去除率提高了18.2%。海藻酸鈉-漆酶-MFC的對外輸出電能相較于未包型MFC提高了1.46倍,COD去除率提高了29.6%。AQDS-CF/PPy/AQDS-MFC對外輸出電能相較與未包型MFC提高了2.8倍,COD去除率提高了70.4%。對三種陽極改性后的MFC進行了產電性能對比,AQDS-CF/PPy/AQDS-MFC的運行和處理廢水效果最佳。

論文研發了一種以聚醚廢水為基質的微生物燃料電池實用裝置,并優化了裝置的運行條件,一方面為聚醚廢水的再利用提供了一條高附加值的資源化新途徑,另一方面也為尋求潔凈新能源提供了一條新思路,該基礎性研究對今后的實際應用具有參考意義:此外,還初步探討了系統中的電子傳遞機制,為更好地開發MFC技術、提高電能輸出提供了理論依據。

Polyether wastewater is one of the mostserious pollution of wastewater in the detergent industry, if polyetherwastewater was discharged directly, the load and cost of wastewater treatmentwill be greatly increased and the useful resources will be wasted;Currently,the sale prospect of the present resource products is notoptimistic,so it is necessary to seek a new way to reuse. Fossil fuel depletionand the increasingly severe global warming problem forces the people to attachgreat importance to renewable energy research and development. Microbial fuelcell (MFC) is a new device that directly transforms chemical energy intoelectrical energy by microbes.This device can realize the microbiologicalelectricity production and sewage treatment, this device has dual functions ofwaste disposal and resource utilization.

The paper starts from the perspective ofthe comprehensive utilization of abandoned resources, polyether wastewater isused as anode liquid matrix, Rhodospirillum rubrum 397 is used as catalyzer.The paper develops a kind of microbial fuel cell technology for polyetherwastewater treatment. The technical feasibility of treating polyetherwastewater by microbial fuel cell is systematically discussed in the paper. Theoptimal operating conditions of microbial fuel cells are obtainedexperimentally. The electron transport mechanism of anode of microbial fuelcell and the contribution of various mechanisms to electricity production areobtained. Finally, the effect of anode modification of microbial fuel cell onimproving the external power output of microbial fuel cell is discussed.Thepaper forms a relatively rounded system.

The feasibility test of polyetherwastewater treatment was carried out by using "double chamber"configuration. The optimum operation conditions of MFC were obtained: pH 6.5,temperature 30 centigrade, stirring rate 150 r/min ~ 200 r/min. Under theoptimum conditions, the polyether cleaning liquid (COD for 1000 mg/L to 2500mg/L) required to be treated by the enterprise has good effect of COD removal.

In this paper, the mechanism of electrontransport in the anode of microbial fuel cell using Rhodospirillum rubrum 397in treating polyether wastewater is discussed in detail. It is found that theelectron transport in the anode is coordinated by the direct contact mechanism,the conductive material mechanism and the electron shuttle mechanism. Thecontribution degree of conductive material mechanism in 0h to 112h is 34.18%,the contribution degree of direct contact mechanism to electricity productionis 65.82%, and the contribution degree of electron shuttle mechanism toelectricity production is 0%.The contribution degree of conductive materialmechanism in 112h to 180h is 27.32%, the contribution degree of direct contactmechanism to electricity production is 32.03%, and the contribution degree ofelectron shuttle mechanism to electricity production is 40.65%.

In order to strengthen the external outputpower of the anode, the effect of anodic modification on MFC is investigated inthis paper. Anodic modification not only improves the external power output ofMFC, but also improves the COD removal rate of polyether waste water of MFCsystem. Microporous filter membrane was used to encapsulate Rhodospirillumrubrum 397 to form microporous filtering film-MFC. Sodium alginate encapsulatedlaccase modified anode carbon felt to form alginate-laccase –MFC. AQDS wasplated on the anode surface by electropolymerization and doping with AQDS, andAQDS-CF/PPy/AQDS-MFC was added to the anode chamber by adding AQDS. The outputpower of microporous filtering film-MFC increased by 7.82% compared with thatof the uncoated MFC, and the COD removal rate increased by 18.2%. The externaloutput power of alginate-laccase-MFC is 1.46 times higher than that of theuncoated MFC, and the COD removal rate is increased by 29.6%.AQDS-CF/PPy/AQDS-MFC output power increased by 2.8 times compared with unpackedMFC

關鍵詞:微生物燃料電池;深紅紅螺菌397;聚醚廢水;電子傳遞機制;產電量;陽極改性

MFC; Rhodospirillum rubrum 397; polyetherwastewater; electron transfer mechanism; production capacity; anodicmodification

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