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为了解决高浓度猪场废水难处理问题,将无能耗微电解、微生物降解和生物电化学工艺融为一体而设计了一种厌氧自电解(anaerobic self-electrolysis,ASE)反应器,考察了反应器启动特性、停留时间和电流密度对猪场废水处理的影响。结果表明,经过43 d序批式培养,ASE成功启动,最大输出电压为0.41 V(无催化剂对照为0.34 V)。停留时间和电流密度对猪场废水厌氧自电解过程有明显影响。在优选停留时间(4 d)和电流密度(4X,4X为反应器外接电阻1 000Ω时电流密度的4倍)条件下,COD和总氮去除率分别可达到86.57%~87.27%和51.57%~52.90%,氨氮和硝氮的去除率分别为31.03%~37.27%和79.45%~84.03%。ASE的产电最大功率密度达到1.9971 W/m3,而对照仅为0.7981 W/m3。GC分析结果显示,猪场废水中的臭味组分经ASE处理可以有效去除。
Anaerobic self-electrolysis (ASE) reactor was designed to solve the problem of refractory waste water treatment in high-concentration pig farms by integrating non-energy consumption micro-electrolysis, microbial degradation and bio-electrochemical processes. Effects of start-up characteristics, residence time and current density on wastewater treatment in pig farms. The results showed that ASE started successfully after 43 days of batch cultivation and the maximum output voltage was 0.41 V (0.34 V without catalyst control). Residence time and current density have significant effects on the anaerobic self-electrolysis of piggery wastewater. Under the optimal residence time (4 d) and current density (4X, 4X, 4 times of the current density when the reactor external resistance is 1000Ω), the COD and total nitrogen removal rates can reach 86.57% ~ 87.27% and 51.57% ~ 52.90%, ammonia nitrogen and nitrate nitrogen removal rates were 31.03% -37.27% and 79.45% -84.03%, respectively. ASE produced a maximum power density of 1.9971 W / m3, while the control was only 0.7981 W / m3. The result of GC analysis shows that the odor components in the wastewater from pig farms can be effectively removed by ASE treatment.