Experimental Two-stage Biological Aerated Filter for Domestic Wastewater Treatment
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摘要: 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22.01 m3/(m2·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ρsCOD<30 mg/L,ρNH3-N<4.0 mg/L,ρSS<10 mg/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.
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关键词:
- 两段曝气生物滤池(BAF) /
- 稳态运行 /
- 非稳态运行 /
- 去除率
Abstract: Two-stage biological aerated filter was used for domestic wastewater treatment. The hydraulic loading rate of A-stage limited to 9.17 m3/(m2·d),15.59 m3/(m2·d) and 22.01 m3/(m2·d) respectively and the ratio of air to water was 6 to 1,while the mtio of air to water was 2 to 1 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.-
Keywords:
- two-stage biological aerated filter(BAF) /
- steady state /
- non-steady state /
- removal
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