连续流生物阴极微生物燃料电池处理猪场废水研究

发布时间：2018-05-17 06:29

本文选题：双圆筒 + 反硝化　；参考：《南昌大学》2015年硕士论文

【摘要】：微生物燃料电池(MFC)能直接将底物转化为电能,实现生物能到电能的转化,而且转化率高达80%,在输出电能的同时,还能利用硝酸盐氮接收电子这一特征处理高浓度氮的有机猪场废水。本实验构建了连续流反硝化生物阴极双室型MFC系统,以实验室某一长期运行的双室MFC系统颗粒污泥对阳极进行接种,阴极室中接种了某地猪场废水处理工艺中的SBBR反应器中的硝化反硝化污泥;考察了其产电效果及底物降解特性,研究了负载电阻、C/N和进水流量及搅拌程度对产电及底物降解效率的影响,最后以实际猪场废水为底物,研究其产电及对猪场废水的处理效果。以模拟废水为启动底物,配水溶液中葡糖糖浓度为3g/L、氯化铵浓度为1.6g/L;进水COD约为2000mg/L、NH3-N约为420mg/L、p H为8.0,MFC系统负载电阻为75?;在连续流的培养方式下,阳极室经过200h后即可完成对产电菌的定向富集及启动过程,阴极室经过了195h后,完成了对反硝化菌的定向富集及其启动过程。MFC稳定运行得到输出电压稳定在473m V左右不在有明显变化,阳极室中COD从2000mg/L下降到了395mg/L,去除率为80.2%,NH3-N从422mg/L下降到了201mg/L,去除率为52.4%;阴极电极电势保持稳定在31m V左右不在有明显变化,阴极室中的NO3-N从422mg/L下降到了47.5mg/L,去除率为88.5%。用欧姆极化曲线法测量MFC系统的表观内阻,得到本MFC系统表观内阻为4.6?,开路电压为554.8 m V,最大输出功率密度为0.98W/m2,相关性为0.9576。在MFC稳定运行后,进行了影响因素分析实验,在选取的负载电阻550?、450?、350?、250?、150?、100?、70?、50?中,通过综合考察各项性能参数,表明负载电阻在70?~350?时,MFC有较好的性能。进水流量分别为4ml/h、6ml/h、8m L/h及10m L/h时,结果表明进水流量为6~8 ml/h时,MFC有较好的性能。C/N分别为10:1、6.7:1、5:1、4:1及3.3:1时,结果表明,当C/N为4:1~6.7:1时,MFC系统有较好的性能。对MFC阳极室中进行搅拌和不进行搅拌两种实验,考察了MFC在不同搅拌程度下的产电性能及底物降解性能。结果表明,在搅拌条件下,MFC的性能更好,此时的功率密度为0.385W/m2,库仑效率为4.48%。优化条件使用实际猪场废水进行实验,得出稳定输出电压为530m V;阴极电极电势为45m V,COD去除率为84.6%;NO3-N去除率为78.5%,说明使用猪场废水并优化条件后,MFC仍然具有较好的产电性能和底物去除效率。
[Abstract]:The microbial fuel cell (MFC) can directly convert the substrate into electric energy, realize the conversion from biological energy to electric energy, and the conversion rate is as high as 80%. Nitrates can also be used for the treatment of organic pig wastewater with high nitrogen concentration. In this experiment, a continuous flow denitrification biological cathode two-compartment MFC system was constructed. The anode was inoculated with granular sludge of a long-running MFC system in the laboratory. The nitrification and denitrification sludge in SBBR reactor was inoculated in the cathode chamber, and the electrogeneration effect and substrate degradation characteristics of the sludge were investigated. The effects of loading resistance C / N, influent flow rate and stirring degree on the efficiency of power generation and substrate degradation were studied. Finally, the effect of electricity production and treatment of pig farm wastewater was studied with actual pig farm wastewater as substrate. Using simulated wastewater as starting material, glucose concentration in aqueous solution is 3 g / L, ammonium chloride concentration is 1.6 g / L, influent COD is about 2000 mg / L, NH _ 3-N is about 420 mg / L ~ (-1) H is 8.0 mg / L ~ (-1) H, load resistance of MFC system is 75%. After 200 hours, the anodic chamber can complete the directional enrichment and start-up process of the electrogen-producing bacteria, and the cathode chamber after 195h. The directional enrichment of denitrifying bacteria and its start-up process, the steady operation of MFC, showed that the output voltage was stable at about 473m V, and there was no obvious change in the output voltage. The COD in anode chamber decreased from 2000mg/L to 395mg / L, the removal rate of NH3-N decreased from 422mg/L to 201mg / L, and the removal rate was 52.4.The cathode potential remained stable at about 31m V, and the NO3-N in cathode chamber decreased from 422mg/L to 47.5 mg / L, and the removal rate was 88.5B. The apparent internal resistance of MFC system was measured by ohmic polarization curve method. The apparent internal resistance, open circuit voltage and maximum output power density of the MFC system were 4. 6 渭 m, 554.8 MV and 0. 98 W / m2, respectively, and the correlation was 0. 957 6. After the stable operation of MFC, the influence factor analysis experiment was carried out. Through the comprehensive investigation of various performance parameters, it is shown that the load resistance is in the range of 70 ~ 350? Time-time MFC has better performance. When the influent flow rate is 4 ml / h / 6 ml / L / h and 10 ml / h, the results show that when the influent flow rate is 6 ~ 8 ml/h, the performance of MFC is better. C / N is 10: 1 / 6. 7: 1: 1 / 4: 1 and 3.3: 1 respectively. The results show that when C / N is 4: 6. 7: 1, the MFC system has better performance. The electrical properties and substrate degradation properties of MFC in different stirring degree were investigated by stirring or not stirring in the anode chamber of MFC. The results show that the performance of MFC is better under stirring condition. The power density is 0.385 W / m ~ (2) and the Coulomb efficiency is 4.48 g / m ~ (2). The optimum condition is to use the wastewater from the actual pig farm to carry out the experiment. The stable output voltage is 530mV and the cathode potential is 45mV. The removal rate of COD is 84.6%. The removal rate of NO3-N is 78.5%, which indicates that the MFC still has good electric performance and substrate removal efficiency after using the wastewater from pig farm and optimizing the conditions.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM911.45;X713

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