反硝化生物阴极耦合电催化反应器除碳脱氮研究

Study on Carbon and Nitrogen Removal by Denitrifying Biocathode Coupled Electrocatalytic Reactor

以活性炭为阴极填料及微生物载体并接种微生物,以溶胶-凝胶法制备的MnO_(x)/Ti微孔电极材料为阳极,构建了反硝化生物阴极-电催化反应器(DBECR),对模拟亚甲基蓝(MB)废水进行了除碳脱氮研究。结果表明,反应器接种后,电流密度和阴极电势对阴极含硝氮废水的更换呈现周期性的响应,表明具有电化学活性的反硝化细菌在活性炭上成功附着生长,DBECR启动成功。DBECR启动成功后,阴极NO_(3)^(-)-N和TN去除率均达到98%以上,阳极MB去除率也从38.4%提高到70.8%。在优化的阳极停留时间34 min时,阳极MB和COD去除率分别为98.4%和49.9%。变形菌门和拟杆菌门是DBECR阴极上的优势菌门,另类希灭氏菌、地碱杆菌和假单胞菌是优势菌属。

A denitrifying biocathode-electrocatalytic reactor(DBECR)was developed using activated carbon as cathode filler and microbial carrier for microorganisms inoculation,and MnO_(x)/Ti microporous electrode prepared via sol-gel technique as the anode.The carbon and nitrogen removal from simulated methylene blue(MB)wastewater was studied.The results showed that,after inoculation,the current density and cathodic potential exhibited periodical responses to the replacement of synthetic nitrate-containing wastewater in the cathode,indicating that there were the electrochemically active denitrifying bacteria successfully adhere to grow on the activated carbon and DBECR successfully started up.After DBECR startup,NO_(3)^(-)-N and TN removal rate in the cathode reached 98%,and MB removal rate in the anode increased from 38.4%to 70.8%.Under the optimized anodic residence time of 34 min,MB and COD removal rates in the anode were 98.4%and 49.9%,respectively.Proteobacteria and Bacteroidetes were the dominant bacteria in the cathode of DBECR,and Alishewanella,Geoalkalibacter and Pseudomonas were the dominant species.