电压和电流对连续电化学厌氧消化的影响

Effects of voltage and current on electrochemical anaerobic digestion

电解电压和电流是连续电化学厌氧消化的重要电化学参数,通过影响厌氧消化电活性微生物活性进而影响电化学厌氧消化。研究改变电压和电流,在35℃下运行连续电化学厌氧消化(EAD),分析了不同条件下的产气量、组分含量、底物消耗率及甲烷产率。结果表明,电压的提高有利于EAD体系内电活性微生物的生长进而促进产生电流,4.0 V时EAD产甲烷最高,电活性微生物活性最强与甲烷产率最佳;当电压继续升高至5.0 V与6.0 V,电压过高抑制反应体系类电活性微生物活性,甲烷产率下降。增加电流运行的EAD均有较高的底物消耗率和较高的甲烷产率。

Electrolysis voltage and current are important electrochemical parameters for continuous electrochemical anaerobic consumption,which affect the electrochemical anaerobic consumption by affecting the activity of electroactive microorganisms.The study changes the voltage and current,runs continuous electrochemical anaerobic consumption(EAD)at 35℃,and analyzes the gas production,component content,substrate consumption rate and methane production rate under different conditions.The results show that the increase in voltage is conducive to the growth of electroactive microorganisms in the EAD system and promotes the generation of current.EAD produces the highest methane at 4.0 V,the activity of electroactive microorganisms is the strongest,and the methane yield is the best;when the voltage continues to increase to 5.0 V compared with 6.0 V,the voltage is too high to inhibit the activity of electroactive microorganisms in the reaction system,and the methane yield decreases.The EAD running with increased current has higher substrate consumption rate and higher methane production rate.