• 关键词：复三维电极-生物膜反应器  反硝化  除磷  电流  温度  pH

• 基金项目：国家水体污染控制与治理科技重大专项(No.2009ZX07317-008-06)

• 姚静华
• 浙江大学环境工程系,杭州 310058

• 赵国智
• 浙江大学环境工程系,杭州 310058

• 田光明
• 浙江大学环境工程系,杭州 310058

• 张建华
• 浙江大学环境工程系,杭州 310058

• 徐文江
• 北京市环境保护科学研究院,北京 100037

• 摘要：研究了连续流复三维电极-生物膜反应器在不同电流、温度和pH条件下的反硝化性能.结果表明,在电流从0 mA增加至100 mA的过程中,NO₃^--N去除率随电流增大而升高;电流为100 mA时NO₃^--N去除率最高,达到了73.8%,出水NO₃^--N浓度为8.27 mg·L^-1;电流高于100 mA时,NO₃^--N去除率略有下降.电流从0 mA增加至150 mA的过程中,NO₂^--N积累量先增加后减少;电流为60 mA时NO₂^--N的积累最为严重.温度为31~35 ℃时,反硝化效果较好,出水NO₃^--N浓度低于10 mg·L^-1;温度为35 ℃时,NO₃^--N去除率最高,达到了85.5%.pH值为7.2~8.2时,反硝化效果较为理想,出水NO₃^--N浓度在10 mg·L^-1以下,NO₂^--N浓度低于1 mg·L^-1.该反应器具有较好的pH缓冲性能,进水pH从5.5上升至9.0的过程中,其出水pH可维持在7.6~8.2,NO₃^--N去除率在59.6%~80.2%.此外,电流、温度和进水pH还对氨氮的生成量和总磷的去除产生明显影响.通过复三维电极-生物膜反应器与纯电化学反应器的对比试验,对氨氮产生和总磷去除的可能原因进行了分析和探讨.

• Abstract：The performance of a three-dimensional biofilm-electrode reactor (3D-BER) was tested under different conditions. Results showed that nitrate removal efficiency increased when the current intensity increased from 0 mA to 100 mA. The highest nitrate removal efficiency of 73.8% was achieved at the current of 100 mA, and the nitrate concentration in the effluent was 8.27 mg·L^-1. However, with a further increase of the current intensity from 100 mA to 150 mA, the nitrate removal efficiency decreased slightly. With the current intensity increased from 0 mA to 150 mA, the nitrite generation increased in the beginning then decreased. The accumulation of nitrite was the most serious when the current was 60 mA. It was founded that the optimum temperature for denitrification was from 31 ℃ to 35 ℃, with nitrate concentrations in effluent less than 10 mg·L^-1. A nitrate removal efficiency up to 85.5% was achieved at 35 ℃. Results showed that appropriate pH for denitrification was between 7.2 and 8.2, with nitrite concentrations in effluent lower than 1 mg·L^-1. The 3D-BER had a good pH buffer capacity. When the pH of the influent increased from 5.5 to 9.0, pH of the effluent ranged between 7.6 and 8.2, with the nitrate removal efficiency between 59.6% and 80.2%. In addition, the current intensity, temperature and pH also influenced the concentrations of ammonia nitrogen in the effluent and the removal efficiency of the total phosphorus (TP). Probable causes of TP removal and ammonia nitrogen generation were also discussed by comparing the performance of the 3D-BER with an electrochemical reactor.

• Key words：three-dimensional biofilm-electrode reactor(3D-BER)  denitrification  phosphorus removal  current intensity  temperature  pH

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