Zhao Y Q, Sun G, Allen S J
School of Chemical Engineering, Queen's University Belfast, David Keir Building, Stranmillis Road, BT9 5AG, Northern Ireland, UK.
Sci Total Environ. 2004 Sep 1;330(1-3):1-8. doi: 10.1016/j.scitotenv.2004.03.002.
The purification capacity of a laboratory scale tidal flow reed bed system with final effluent recirculation at a ratio of 1:1 was investigated in this study. In particular, the four-stage reed bed system was heavily loaded with strong agricultural wastewater. Under the hydraulic and organic loading rates of 0.43 m3/m2.d and 1055 gCOD/m2.d, respectively, the average removal efficiencies obtained for COD, BOD5, SS, NH4-N and P were 77%, 78%, 66%, 62% and 38%, respectively. Even with the high loading rates, approximately 30% of NH4-N was converted into NO2-N and NO3-N from the mid-stage of the system where nitrification took place. The results suggest that the multi-stage reed bed system could be employed to treat strong wastewater under high loading, especially for the substantive mass removal of solids, organic matter and ammoniacal-nitrogen. Tidal flow combined with effluent recirculation is a favourable operation strategy to achieve this objective.
本研究考察了实验室规模的潮汐流芦苇床系统在终沉出水以1:1比例回流情况下的净化能力。具体而言，该四级芦苇床系统承受了高负荷的强农业废水。在水力负荷率和有机负荷率分别为0.43 m³/m²·d和1055 gCOD/m²·d的条件下，COD、BOD5、SS、NH4-N和P的平均去除率分别为77%、78%、66%、62%和38%。即便在高负荷率情况下，从系统发生硝化作用的中期起，仍有约30%的NH4-N转化为了NO2-N和NO3-N。结果表明，多级芦苇床系统可用于处理高负荷的强废水，特别是对于大量去除固体、有机物和氨氮而言。潮汐流与出水回流相结合是实现这一目标的有利运行策略。
