两段曝气生物滤池处理生活污水的净化效能

Experimental Two-stage Biological Aerated Filter for Domestic Wastewater Treatment

采用两段曝气生物滤池进行了生活污水的试验研究。A段反应器进水负荷分别控制在9．17、15．59和22．01m^3／（m^2·d），气水体积比为6：1；B段反应器气水体积比控制在2：1，温度在18～20℃．经过近3个月的试验运行，结果表明：在稳态运行条件下，该系统出水稳定优质psCOD〈30mg／L，pNH3-N〈4．0mg／L，pSS〈10mg／L。无色无味透明），做进一步的消毒处理后可作生活杂用水．而在负荷变化及实施反冲洗等非稳态条件下。系统出水的sCOD、氨氮、TN和TP出水质量浓度仍保持较低值．试验表明。要维持两段BAF系统持续稳定运行．预处理、适当的反冲洗强度和良好的启动条件是必要的．

Two-stage biological aerated filter was used for domestic wastewater treatment. The hydraulic loading rate of A-stage limited to 9.17 m3/（m^2·d）, 15.59 m^3/（m^2·d） and 22.01 m^3/（m^2·d） respectively and the ratio of air to water was 6 to 1, while the mtio of air to water was 2 to I at B-stage, and temperature was kept in the range of 18-20℃ throughout the experiment. After 3-month operation, the rosult shows that stable and advanced effluent with the results of sCOD（ 30 mg/L, NH3-N（ 4.0 mg/L, SS（ 10 mg/L at steady state has been abtained, and the chlorinated effluent well meets the quality standards of water reused for toilet flushing, street flushing, fire fighting and urban greening; Meanwhile, the sCOD, ammonium, total nitrogen and total phosphorous of the effluant also has been kept at lower level under the condition of non-steady state such as loading rate adjustment or backwashing. Moreover, it is to maintain a stable operation of the BAF system, pre-treatment, suitable backwashing rate and good start-up conditions are quite necessary.