Sabbah I, Ghattas B, Hayeek A, Omari J, Haj Y, Admon S, Green M
R&D Center-The Galilee Society, PO Box 437, Shefa-Amr 20200, Israel.
Water Sci Technol. 2003;48(11-12):147-52.
This paper concentrates on Intermittent Sand Filtration (ISF) as a polishing stage for effluent from a facultative pond. During the three-year research program, the system operated with an influent flow-rate of 500-1,000 L/day and an average BOD concentration of 200-400 hydraulic and BOD loadings of 110-200 L/m2/day and 20-40 gBOD/m2/day, respectively. Flow to the ISF was applied intermittently with a different number of doses in each run. In addition, the effects of the frequency and the duration of rest periods (no feeding) were studied. Removal of 90-95% of BOD and 75-90% of COD and TSS was achieved consistently throughout the study period. Elevated levels of nitrification were observed with 95-100% removal of NH3. The ISF performed best when fed with 5-10 doses/day. Reducing the daily number of doses to 3/day at the same hydraulic loading rate resulted in a 20-30% reduction in removal efficiency. The 2-4 week rest period had no effect on the biological activity in the subsequent run. However, rest periods of more than 30 days were found to negatively affect removal efficiency.
本文着重研究间歇砂滤（ISF）作为兼性塘出水的抛光处理阶段。在为期三年的研究项目中，该系统运行时进水流量为500 - 1000升/天，平均生化需氧量（BOD）浓度为200 - 400，水力负荷和BOD负荷分别为110 - 200升/平方米·天和20 - 40克BOD/平方米·天。进入ISF的水流是间歇性的，每次运行的投加次数不同。此外，还研究了休止期（不进水）的频率和持续时间的影响。在整个研究期间， consistently实现了90 - 95%的BOD去除率以及75 - 90%的化学需氧量（COD）和总悬浮固体（TSS）去除率。观察到硝化水平升高，氨（NH3）去除率达到95 - 100%。当每天投加5 - 10次时，ISF的性能最佳。在相同水力负荷率下将每日投加次数减少到3次/天，去除效率降低了20 - 30%。2 - 4周的休止期对后续运行中的生物活性没有影响。然而，发现休止期超过30天会对去除效率产生负面影响。
