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提高MFC产电量及阳极电子传递机制的研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/10/29 7:54:37  

摘要:聚醚废水是洗涤制造业中污染最为严重的废水之一,若直接排放,会大大增加废水处理负荷及成本,且造成有用资源浪费;目前资源化产品的销路前景并不乐观,故急需寻求一种新的资源化方式。化石燃料耗竭与全球气候变暖问题的日益严峻,迫使世界各国高度重视可再生能源的研发,而微生物燃料电池(MFC)是一种利用微生物将化学能直接转化为电能的新型装置,可同步实现微生物产电和污水处理,具有废弃物处置与资源化利用双重功效。

文章从废弃资源综合利用的角度出发,采用聚醚废水作为阳极液基质,深红红螺菌397为催化剂,开发了微生物燃料电池处理聚醚废水技术。文章系统论述了微生物燃料电池处理聚醚废水的技术可行性,实验得出微生物燃料电池的最优运行条件,研究得出微生物燃料电池的阳极电子传递机制及各种机制对产电量贡献度的大小,最后探讨了微生物燃料电池阳极改性对提高微生物燃料电池对外产电量的影响,形成较为完整的体系。

采用“双室”构型的MFC进行以聚醚废水为阳极液基质的可行性试验,得到MFC的最优运行条件:pH为6.5,温度为30℃,搅拌速率为150 r/min~200r/min。微生物燃料电池在最优条件下运行时,微生物燃料电池对企业要求处理的聚醚装置清洗液(COD为1000 mg/L~2500 mg/L)均有较佳的COD去除效果。

本文详细探讨了微生物燃料电池利用深红红螺菌397在处理聚醚废水时阳极的电子传递机制,研究发现阳极的电子传递是由直接接触机制、导电物质介导机制和电子穿梭机制协同完成的,0h~112h内导电物质介导机制对产电量的贡献度为34.18%,直接接触机制对产电量的贡献度为65.82%,电子穿梭机制对产电量的贡献度为0%。112h~180h内导电物质介导机制对产电量的贡献度为27.32%,直接接触机制对产电量的贡献度为32.03%,电子穿梭机制对产电量的贡献度为40.65%。

为了加强阳极对外输出电能,文章对阳极碳毡进行改性探究,在提高MFC的对外输出电能的同时,也提高了MFC系统的聚醚废水的COD去除率。用微孔滤膜包裹深红红螺菌397修饰阳极碳毡构成微孔滤膜-MFC,用海藻酸钠包埋漆酶修饰阳极碳毡构成海藻酸钠-漆酶-MFC,用AQDS通过电聚合-掺杂技术将AQDS镀在阳极表面,并在阳极室内加入AQDS构成AQDS-CF/PPy/AQDS-MFC。其中微孔滤膜-MFC的对外输出电能相较于未包型MFC提高了7.82%,COD去除率提高了18.2%。海藻酸钠-漆酶-MFC的对外输出电能相较于未包型MFC提高了1.46倍,COD去除率提高了29.6%。AQDS-CF/PPy/AQDS-MFC对外输出电能相较与未包型MFC提高了2.8倍,COD去除率提高了70.4%。对三种阳极改性后的MFC进行了产电性能对比,AQDS-CF/PPy/AQDS-MFC的运行和处理废水效果最佳。

论文研发了一种以聚醚废水为基质的微生物燃料电池实用装置,并优化了装置的运行条件,一方面为聚醚废水的再利用提供了一条高附加值的资源化新途径,另一方面也为寻求洁净新能源提供了一条新思路,该基础性研究对今后的实际应用具有参考意义:此外,还初步探讨了系统中的电子传递机制,为更好地开发MFC技术、提高电能输出提供了理论依据。

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

关键词:微生物燃料电池;深红红螺菌397;聚醚废水;电子传递机制;产电量;阳极改性

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

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