本文選題：微生物燃料電池 + 升流式厭氧污泥床��； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：升流式厭氧污泥床(Up-flow Anaerobic Sludge Blanket,UASB)-微生物燃料電池(Microbial Fuel Cell,MFC)生物傳感器因其能夠?qū)ASB運(yùn)行狀態(tài)進(jìn)行穩(wěn)定監(jiān)測而被廣泛研究。顆粒污泥作為UASB-MFC耦合系統(tǒng)穩(wěn)定運(yùn)行的關(guān)鍵,因其具有較高的生物活性,助于快速降解有機(jī)物,利于生物傳感,而零價(jià)鐵(Zero-valent Iron,ZVI)具有吸附作用,能使微生物快速聚集。因此本文將零價(jià)鐵應(yīng)用于UASB-MFC耦合系統(tǒng)中,研究ZVI對污泥顆�；挠绊�;此外,由于UASB-MFC耦合系統(tǒng)受水解酸化及MFC電子傳遞等影響,從而導(dǎo)致生物傳感性能受阻,響應(yīng)時(shí)間長。因而利用ZVI較強(qiáng)的還原性能研究其對生物傳感的影響。根據(jù)課題的實(shí)驗(yàn)研究與分析,得出如下結(jié)論:1.零價(jià)鐵能夠有效促進(jìn)污泥顆�；M(jìn)程。通過不同ZVI濃度投加后反應(yīng)器狀況對比,反應(yīng)器R1(ZVIOmg/L)內(nèi)污泥平均粒徑由52μm增長到851μm,而投加零價(jià)鐵后顆粒平均粒徑的增大,其中R4(ZVI 30mg/L)中粒徑增加最多,由55μm增加至1332μm,且其大顆粒污泥所占比例較高。除此之外,零價(jià)鐵促進(jìn)系統(tǒng)內(nèi)胞外聚合物中蛋白質(zhì)的分泌,使污泥絮凝性能得到改善,同時(shí)相對應(yīng)的降低Zeta電位,說明適量零價(jià)鐵能夠有效促進(jìn)污泥顆�；M(jìn)程。2.零價(jià)鐵對于強(qiáng)化生物傳感器產(chǎn)電性能與傳感性能具有一定作用。通過對比電信號和pH對濃度變化的反饋時(shí)間,得出電信號對濃度的反饋比pH的反饋更加快速。在500-2000mg/L范圍內(nèi),ZVI不僅能夠加速電信號及pH反饋速率,縮短反饋時(shí)間,且能對電信號起到擴(kuò)增作用;在2000-6000mg/L范圍內(nèi),ZVI的投加反而會對pH的反饋有所延滯。通過電化學(xué)測試得出,投加零價(jià)鐵能夠提升MFC的功率密度及庫倫效率,降低內(nèi)阻。由于零價(jià)鐵增加溶液的離子強(qiáng)度,能夠提升細(xì)菌和陽極表面電子的傳遞,使其電化學(xué)活性增強(qiáng),助于MFC的電子傳遞過程,益于生物傳感器性能提升。3.零價(jià)鐵能提高水解酸化效率并優(yōu)化產(chǎn)酸類型。當(dāng)有機(jī)負(fù)荷為0.36gCOD/gMLSS·d時(shí),各系統(tǒng)TVFA均維持在70mg/L,且VFA成分以乙酸為主,達(dá)到50%,ZVI對于VFA成分影響并不明顯;在有機(jī)負(fù)荷為4.32gCOD/gMLSS·d時(shí),系統(tǒng)負(fù)載過大,出現(xiàn)酸化狀態(tài),ZVI0mg/L時(shí)TVFA為1424mg/L,而隨著ZVI投加量增加,TVFA顯著降低,ZVI 50mg/L時(shí),TVFA為814mg/L,下降43%。零價(jià)鐵的加入使反應(yīng)器內(nèi)丁酸占總揮發(fā)性脂肪酸比例降低6%-21%,乙酸含量增加8%-21%。零價(jià)鐵對水解酸化的強(qiáng)化效應(yīng),可對降低后續(xù)處理負(fù)荷、形成更有利的有機(jī)酸形式起促進(jìn)作用。
[Abstract]:Up-flow Anaerobic Sludge Blanketn UASBM-microbial Fuel Cell-MFC biosensor has been widely studied for its ability to monitor the stability of UASB operation in Up-flow anaerobic sludge bed. Granular sludge is the key to the stable operation of UASB-MFC coupling system, because of its high biological activity, which is helpful to the rapid degradation of organic matter and is beneficial to biosensor, and Zero-valent Iron-Iron-ZVI) has the adsorption function, and can make the microorganism gather rapidly. In this paper, zero-valent iron is applied to the UASB-MFC coupling system to study the effect of ZVI on sludge granulation. In addition, the UASB-MFC coupling system is affected by hydrolytic acidification and MFC electron transport, which results in hindered biosensor performance and long response time. Therefore, the effect of ZVI on biosensor was studied by using its strong reduction property. According to the experimental research and analysis of the subject, the following conclusion is drawn: 1. Zero valent iron can effectively promote sludge granulation process. After adding different ZVI concentration, the average particle size of sludge increased from 52 渭 m to 851 渭 m in reactor R1 + ZVI Omg / L, and the average particle size increased after adding zero valent iron, in which the particle size of R4(ZVI 30 mg / L increased the most. It was increased from 55 渭 m to 1332 渭 m, and the proportion of large granular sludge was higher. In addition, zero-valent iron can promote the secretion of protein in extracellular polymer, improve the flocculation performance of sludge, and reduce the Zeta potential, which indicates that zero-valent iron can effectively promote the process of sludge granulation. 2. Zero valent iron plays an important role in enhancing the electrical and sensing properties of biosensors. By comparing the feedback time of electric signal and pH on the change of concentration, it is concluded that the feedback of electric signal to concentration is faster than that of pH. ZVI can not only accelerate the feedback rate of electric signal and pH, shorten the feedback time, but also amplify the electric signal in the range of 500-2000mg/L, but delay the feedback of pH in the range of 2000-6000mg/L. The results of electrochemical test show that adding zero valent iron can improve the power density and Coulomb efficiency of MFC and reduce the internal resistance. By increasing the ionic strength of the solution, the zero-valent iron can enhance the electron transfer between bacteria and anode surface, and enhance the electrochemical activity of the solution, which is beneficial to the electron transfer process of MFC and the performance of biosensor. 3. Zero valent iron can improve the efficiency of hydrolysis and acidification and optimize the type of acid production. When the organic load was 0.36gCOD/gMLSS d, the TVFA of each system was maintained at 70 mg / L, and the VFA component was mainly acetic acid, and the effect on the composition of VFA was not obvious when the organic load was 50% 4.32gCOD/gMLSS d, but the system load was too large when the organic load was 4.32gCOD/gMLSS d. The TVFA of ZVI0 mg / L was 1424 mg / L, while with the increase of ZVI dosage, the TTV FA of ZVI 50mg/L decreased by 814 mg / L, and decreased by 43%. The ratio of butyric acid to total volatile fatty acids in the reactor was reduced by 6- 21 with the addition of zero valent iron, and the content of acetic acid increased by 8- 21. The strengthening effect of zero valent iron on hydrolysis and acidification can promote the formation of more favorable organic acid form by reducing the load of subsequent treatment.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703;TP212.3

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