Development of anaerobic digestion system integrated with a fuel cell and electrochemical oxidation process for removal of nitrogen compounds

对牛粪厌氧消化出水的电化学氧化进行了研究。对含悬浮物的消化出水样品进行过滤预处理，进行电化学实验。通过采用尺寸稳定阳极（DSA）和Ti/PbO2作为阳极，评价了直接阳极氧化和间接氧化的影响。二氧化铅包覆钛（Ti/PbO2）电极的化学需氧量（COD）下降速率高于DSA，但DSA由于控制了硝酸铵（NO3-N）的积累而成为降低铵态氮（NH4-N）的首选阳极。结果表明：采用悬浮物过滤作为预处理，再加入NaCl，可以提高电化学氧化消化出水中NH4-N的整体去除效率。

The electrochemical oxidation of the digested effluent from anaerobic digestion of dairy manure was investigated in this study. The digested effluent sample containing with suspended solids was pretreated by filtration for the electrochemical experiment. The influence of direct anodic oxidation and indirect oxidation was evaluated through the use of dimensionally stable anode (DSA) and Ti/PbO2 as anode. The decreasing rate of chemical oxygen demand (COD) was higher at lead dioxide coated titanium (Ti/PbO2) electrode than at DSA, however the DSA was preferred anode for the decrease of ammonium nitrogen (NH4-N) due to the control of ammonium nitrate (NO3-N) accumulation. The results showed that the filtration of suspended solids as a pretreatment and addition of NaCl could improve the whole removing efficiency of NH4-N in the digested effluent on electrochemical oxidation.