生物产电加速污泥湿地中有机物降解性能

摘要

In order to enhance the sludge organics degradation rate in sludge wetland treatment system, this paper for the first time combining the bioelectrohenesis with STW system to improve the performance of STW and recovery biomass energy simultaneously. The degradation rate of sludge and power output under different organic loading of the MFC⁃STW system, using Canna as wetland plants, were investigated. Experimental results showed that both of the output voltage and power density of MFC⁃STW system increased significantly with the increasing of sludge loads. The maximum output voltage and power density of the MFC⁃STW system under steady⁃state operation were 0.794 V and 0.268 W/m3 , respectively. During the charged circulation period, moisture content of the bottom layer sludge in MFC⁃STW system reached 84%, which was 7% lower than that in the with a STW system with no electricity production. Moreover, the average TCOD degradation rate of MFC⁃STW system was 74%, was 11% higher than the blank test. Bioelectrogenesis could improve the performance of sludge dehydration and degradation during sludge wetland treatment.%为解决污泥处理湿地（ sludge treatment wetland，STW）污泥降解能力弱的问题，首次提出在STW系统中嵌入生物产电装制，以加速污泥湿地处理过程中污泥有机物的降解性能，同时回收污泥生物质能．启动以美人蕉为湿地植物的微生物燃料电池—污泥处理湿地系统（ MFC⁃STW），通过电化学测量与有机物分析，考察不同进泥负荷下污泥湿地处理系统的有机物降解及产电性能．结果表明，MFC⁃STW系统的输出电压、内阻、功率密度均随进泥负荷增大而升高．系统的最大电压和最大功率密度分别为0．794 V和0．268 W／m3．在负荷期内，MFC⁃STW系统下层积存污泥含水率为84％，TCOD降解率为74％，较STW系统分别提高7％和11％．说明生物产电可促进污泥湿地处理过程中的污泥脱水和有机物降解性能．