微生物燃料电池处理晚期垃圾渗滤液的特性研究

Treatment of mature landfill leachate by microbial fuel cell

采用双室型微生物燃料电池(MFC)处理晚期垃圾渗滤液,考察了其产电性能及渗滤液处理效果。在外阻为1 000Ω,MFC中垃圾渗滤液的体积分数为20%时,其最大输出电压为660.6 mV,最大输出功率密度为2 182.0mW/m3。当体积分数升至100%,其最大输出电压为709.4 mV,最大输出功率密度为2 513.4 mW/m3,COD去除率约为70.4%。MFC运行期间,渗滤液中的氨氮一部分在阳极室中作为电子供体产电而被去除,另一部分从阳极室转移到阴极室,7 d内NH4+转移率达43%。与此同时,内阻从1 010Ω增加到2 000Ω,阳极液电导率从2.09×10-3S/cm下降到9.15×10-4S/cm。

Dual-chamber type microbial fuel-cell（MFC ） has been used for treating mature landfill leachate. Its electrogenesis and treatment effect on mature landfill leachate are investigated. The results show that when the exter- nal resistance is 1 000 Ω and volume fraction of the landfill leachate in MFC is 20%, its maximum output voltage is 660.6 mV and maximum output power density is 2 182.0 mW/m3. When the volume fraction increases to 100%,its maximum output voltage is 709.4 mV,and maximum output power density is 2 513.4 mW/m3. As a result,the COD removing rate is about 70.4%. During the operation of MFC, part of ammoniaum-nitrogen in the landfill leachte as electron donor electrogenesis in the anode chamber, can be removed and the other part of ammonium-nitrogen can be transferred from the anode chamber to cathode chamber. The NH4＋ transferring rate reaches 43% within 7 d. Mean- while ,the internal resistance of MFC is increased from 1 010 Ωto 2 000Ω, and the conductivity in anode anolyte is decreased from 2.09×10^-3 S/cm to 9.15×10^-4 S/cm.