反硝化厌氧甲烷氧化（DAMO）过程可以由一种称为Methylomirabilis oxy f era的DAMO细菌在有或者没有DAMO古菌下完成．已经报道的DAMO过程的菌群富集时间长（一般需要7～18月），且DAMO体系反硝化速率低．利用中空纤维膜生物反应器（HFM...反硝化厌氧甲烷氧化（DAMO）过程可以由一种称为Methylomirabilis oxy f era的DAMO细菌在有或者没有DAMO古菌下完成．已经报道的DAMO过程的菌群富集时间长（一般需要7～18月），且DAMO体系反硝化速率低．利用中空纤维膜生物反应器（HFMB）提高甲烷的传质来试图实现快速启动DAMO反应，结果发现HFMB在不到3个月时间内就表现出DAMO反应，其反硝化速率达到50 mg · L －1· d－1硝酸盐氮．二代测序显示，HFMB中微生物以 A naerolineaceae ， A zospira ，CL500‐3占绝对优势，分别为39.08％，13.68％和11.54％，而 DAMO 细菌（Methylomirabilis）和与厌氧甲烷氧化有关的古菌 Methanosarcina分别占0.02％和0.13％，因此推测在HFMB中DAMO过程是由一群新的菌群主导完成．展开更多
Proton-hole mixed conductor, SrCeo.95Yb0.05O3-α(SCYb), has the potential to be used as a membrane for dehydrogenation reactions such as methane coupling due to its high C2-selectivity and its simplicity for fabricati...Proton-hole mixed conductor, SrCeo.95Yb0.05O3-α(SCYb), has the potential to be used as a membrane for dehydrogenation reactions such as methane coupling due to its high C2-selectivity and its simplicity for fabricating reactor systems. In addition, the mixed conducting membrane in the hollow fibre geometry is capable of providing high surface area per unit volume. In this study, mechanism of methane coupling reaction on the SCYb membrane was proposed and the kinetic parameters were obtained by regression of experimental data. A mathematical model describing the methane coupling in the SCYb hollow fibre membrane reactor was also developed. With this mathematical model, various operating conditions such as the operation mode, operation pressure and feed concentrations affecting performance of the reactor were investigated. The simulation results show that the cocurrent flow in the reactor exhibits higher conversion of methane and higher yield of ethylene compared to the countercurrent flow. In order to achieve the highest C2 yield, especially of ethylene, pure methane should be used as feed and the operating pressure be 300 kPa. Air can be used as the source of oxygen for the reaction and its optimum feed velocity is twice of the methane feed velocity. The air pressure in the lumen side should be kept the same as or slightly lower than the pressure of shell side.展开更多
文摘反硝化厌氧甲烷氧化（DAMO）过程可以由一种称为Methylomirabilis oxy f era的DAMO细菌在有或者没有DAMO古菌下完成．已经报道的DAMO过程的菌群富集时间长（一般需要7～18月），且DAMO体系反硝化速率低．利用中空纤维膜生物反应器（HFMB）提高甲烷的传质来试图实现快速启动DAMO反应，结果发现HFMB在不到3个月时间内就表现出DAMO反应，其反硝化速率达到50 mg · L －1· d－1硝酸盐氮．二代测序显示，HFMB中微生物以 A naerolineaceae ， A zospira ，CL500‐3占绝对优势，分别为39.08％，13.68％和11.54％，而 DAMO 细菌（Methylomirabilis）和与厌氧甲烷氧化有关的古菌 Methanosarcina分别占0.02％和0.13％，因此推测在HFMB中DAMO过程是由一群新的菌群主导完成．
基金Supported by the National Natural Science Foundation of China(No.20076025).
文摘Proton-hole mixed conductor, SrCeo.95Yb0.05O3-α(SCYb), has the potential to be used as a membrane for dehydrogenation reactions such as methane coupling due to its high C2-selectivity and its simplicity for fabricating reactor systems. In addition, the mixed conducting membrane in the hollow fibre geometry is capable of providing high surface area per unit volume. In this study, mechanism of methane coupling reaction on the SCYb membrane was proposed and the kinetic parameters were obtained by regression of experimental data. A mathematical model describing the methane coupling in the SCYb hollow fibre membrane reactor was also developed. With this mathematical model, various operating conditions such as the operation mode, operation pressure and feed concentrations affecting performance of the reactor were investigated. The simulation results show that the cocurrent flow in the reactor exhibits higher conversion of methane and higher yield of ethylene compared to the countercurrent flow. In order to achieve the highest C2 yield, especially of ethylene, pure methane should be used as feed and the operating pressure be 300 kPa. Air can be used as the source of oxygen for the reaction and its optimum feed velocity is twice of the methane feed velocity. The air pressure in the lumen side should be kept the same as or slightly lower than the pressure of shell side.
