本文選題：微生物電解池　切入點(diǎn)：活性炭催化劑　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：微生物電解池（Microbial electrolysis cell, MEC）是一種新型的且能兼顧氫氣或甲烷回收的廢水處理技術(shù)。MEC具有很好的應(yīng)用前景，但在發(fā)展過程中存在諸多挑戰(zhàn)，，如陰極材料的廉價(jià)化與高效化、評(píng)價(jià)體系有待完善以及連續(xù)流放大式MEC的運(yùn)行效能有待進(jìn)一步解析。面對(duì)上述挑戰(zhàn)，本文考察了活性炭催化劑在微型MEC中的產(chǎn)氫效能，同時(shí)基于傳統(tǒng)評(píng)價(jià)體系和新型的評(píng)價(jià)體系進(jìn)行性能分析，探討新型評(píng)價(jià)體系的可用性。本實(shí)驗(yàn)搭建了擋板式微生物電解池（baffled microbialelectrolysis cell, ABR-MEC），研究了ABR-MEC連續(xù)流運(yùn)行效能，解析了甲烷可能的來源和陽極生物膜群落結(jié)構(gòu)的動(dòng)態(tài)變化。最后，本文探討了ABR-MEC在連續(xù)流運(yùn)行狀態(tài)下的產(chǎn)甲烷效能與能量效益。 本實(shí)驗(yàn)研究了活性炭-鋼網(wǎng)陰極MEC（AC/SS-MEC）在不同外加電壓下的產(chǎn)氫效能�；趥鹘y(tǒng)的評(píng)價(jià)體系，AC/SS-MEC在1.4V下能夠獲得最高的最大電流密度和最大產(chǎn)氫速率，在1.0V和1.2V下能夠獲得最高的能量效率，并發(fā)現(xiàn)其產(chǎn)氫效率隨外加電壓的變大而升高�；谛滦偷脑u(píng)價(jià)體系，AC/SS-MEC在1.2V下能夠獲得最高的平均電流密度和最高的平均產(chǎn)氫速率，探明了產(chǎn)氫效率隨外加電壓的變大而升高的原因，并引入廢水處理效率用以表征AC/SS-MEC的能量效率。 本實(shí)驗(yàn)研究了ABR-MEC在不同水力停留時(shí)間（HRT）下的運(yùn)行效能。當(dāng)HRT從2天縮短至1天時(shí)，氫氣日產(chǎn)量降低，甲烷日產(chǎn)量上升。隨著HRT從1天繼續(xù)縮短至0.5天，氫氣日產(chǎn)量降低，甲烷日產(chǎn)量也有所下降。通過簡(jiǎn)化的電子平衡計(jì)算解析了ABR-MEC產(chǎn)甲烷的可能來源，發(fā)現(xiàn)在HRT為2天時(shí)，主要來源可能是嗜氫產(chǎn)甲烷菌。當(dāng)HRT縮短至1天時(shí)，主要來源可能是嗜乙酸產(chǎn)甲烷菌。通過高通量測(cè)序技術(shù)解析了ABR-MEC陽極生物膜群落結(jié)構(gòu)隨HRT的縮短而產(chǎn)生的變化，發(fā)現(xiàn)隨HRT從1天縮短至0.5天，產(chǎn)電微生物群落受到一定的抑制，影響了ABR-MEC的產(chǎn)電與產(chǎn)氫效率，降低了ABR-MEC的產(chǎn)甲烷效率。 最后，本實(shí)驗(yàn)通過外加電壓和底物濃度的調(diào)節(jié)，研究了ABR-MEC連續(xù)流產(chǎn)甲烷效能，結(jié)果表明，相比于提高底物濃度，提高外加電壓有助于ABR-MEC產(chǎn)甲烷效能的迅速增強(qiáng)，但外加電壓的變大卻降低了ABR-MEC的能量效益。因此，當(dāng)為連續(xù)流放大式MEC選擇合適的外界條件時(shí)，應(yīng)綜合考慮其運(yùn)行效能和能量效益。
[Abstract]:Microbial electrolysis cell (MECs) is a new wastewater treatment technology which can take hydrogen or methane recovery into account. MECs have a good prospect of application. However, there are many challenges in the development process, such as the cheap and high efficiency of cathode materials. The evaluation system needs to be improved and the operation efficiency of continuous flow amplified MEC needs to be further analyzed. In the face of the above challenges, the hydrogen production efficiency of activated carbon catalyst in miniature MEC was investigated. At the same time, based on the performance analysis of the traditional evaluation system and the new evaluation system, the usability of the new evaluation system is discussed. In this experiment, the baffle microorganism electrolytic cell microbialelectrolysis cell (ABR-MEC) is built, and the continuous flow operation efficiency of ABR-MEC is studied. The possible sources of methane and the dynamic changes of anode biofilm community structure were analyzed. Finally, the methanogenic efficiency and energy efficiency of ABR-MEC in continuous flow operation were discussed. The hydrogen production efficiency of AC / SS-MECs at different applied voltages was studied. The maximum current density and maximum hydrogen production rate were obtained at 1.4V based on the traditional evaluation system. The maximum energy efficiency can be obtained at 1.0V and 1.2V, and it is found that the hydrogen production efficiency increases with the increase of applied voltage. Based on the new evaluation system ACP-SS-MEC, the highest average current density and the highest average hydrogen production rate can be obtained at 1.2V. The reason for the increase of hydrogen production efficiency with the increase of applied voltage was found, and the efficiency of wastewater treatment was introduced to characterize the energy efficiency of AC/SS-MEC. The operation efficiency of ABR-MEC under different HRT (HRT) was studied. When HRT was shortened from 2 days to 1 day, the daily production of hydrogen decreased and the daily output of methane increased. With the further shortening of HRT from 1 day to 0. 5 days, the daily production of hydrogen decreased. The possible sources of ABR-MEC methanogenesis were analyzed by simplified electronic equilibrium calculations. It was found that when HRT was 2 days, the main source might be hydrophilic methanogenic bacteria. When HRT was shortened to 1 day, The changes of ABR-MEC anode biofilm community with the shortening of HRT were analyzed by high-throughput sequencing. It was found that the electrogen-producing microbial community was inhibited with the shortening of HRT from 1 day to 0.5 day. The electricity and hydrogen production efficiency of ABR-MEC was affected, and the methane production efficiency of ABR-MEC was decreased. Finally, the effect of ABR-MEC continuous abortion methane was studied by adjusting the applied voltage and substrate concentration. The results showed that compared with increasing the substrate concentration, increasing the applied voltage contributed to the rapid enhancement of the methanogenic efficiency of ABR-MEC. However, the increase of applied voltage reduces the energy efficiency of ABR-MEC. Therefore, when choosing suitable external conditions for continuous current amplifying MEC, the efficiency and energy efficiency should be considered comprehensively.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：X703;TM911.45

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相關(guān)期刊論文 前2條

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本文編號(hào)：1641995