下行流芦苇床污水处理试验研究与设计方程

WASTEWATER TREATMENT IN CONSTRUCTED DOWNFLOW REED BEDS:EXPERIMENTAL STUDIES AND DESIGN EQUATION

对于用人工下行流芦苇床处理污水的技术进行了研究。实验结果显示：这类芦苇床具有较好的耗氧处理能力，能够明显地降低污水的ＢＯＤ５和ＣＯＤ；ＳＳ、ＰＯ４－Ｐ和ＮＨ４－Ｎ也可得到一定的去除；ＢＯＤ５与ＣＯＤ的去除速率随有机负荷的增加而增加，随水力负荷的增大而减小，增加进水频率有利于提高其去除效果；ＢＯＤ５的去除可认为由吸附与生物耗氧降解两步进行。在此基础上提出了有关的设计方程。

Studies were carried out on wastewater treatment using constructed downflow reed beds.Experimental results indicate that significant BOD5 and COD reductions can be obtained in these beds owing to their good areobic treatment ability,considerable amounts of SS.PO4-P and NH4-N can be removed,and the removal rates of BOD5 and COD increase with organic load and feeding frequency and decrease with hydraulic loading.A design equation for this downflow reed beds was set up based on an assumption of BOD5 removal caused by the consecutive processes of adsorption and aerobic microbial decomposition.