El-Shafai Saber A, El-Gohary Fatma A, Nasr Fayza A, van der Steen N Peter, Gijzen Huub J
Water Pollution Control Department, National Research Centre, El-Tahrir Street, Dokki, Egypt.
Bioresour Technol. 2007 Mar;98(4):798-807. doi: 10.1016/j.biortech.2006.03.011. Epub 2006 May 19.
The pilot-scale wastewater treatment system used in this study comprised a 40-l UASB reactor (6-h HRT) followed by three duckweed ponds in series (total HRT 15 days). During the warm season, the treatment system achieved removal values of 93%, 96% and 91% for COD, BOD and TSS, respectively. Residual values of ammonia, TKN and total phosphorus were 0.41 mg N/l, 4.4 mg N/l and 1.11 mg P/l, with removal efficiencies of 98%, 85% and 78%, respectively. The system achieved 99.998% faecal coliform removal during the warm season with final effluent containing 4 x 10(3) cfu/100 ml. During the winter, the system was efficient in removing COD, BOD and TSS but not nutrients. The system was deficient in the removal of faecal coliforms during the winter, producing effluent with 4.7 x 10(5) cfu/100 ml. During the warm season, the N removal consisted of 80% by plant uptake, 5% by sedimentation and 15% unaccounted for. A duckweed production rate of 33 t dry matter per hectare per 8 months was achieved.
本研究中使用的中试规模废水处理系统包括一个40升的UASB反应器（水力停留时间为6小时），随后串联三个浮萍池（总水力停留时间为15天）。在温暖季节，该处理系统对COD、BOD和TSS的去除率分别达到93%、96%和91%。氨、总凯氏氮和总磷的残留值分别为0.41毫克氮/升、4.4毫克氮/升和1.11毫克磷/升，去除效率分别为98%、85%和78%。该系统在温暖季节对粪便大肠菌群的去除率达到99.998%，最终出水粪便大肠菌群含量为4×10³ 菌落形成单位/100毫升。在冬季，该系统能有效去除COD、BOD和TSS，但对营养物质的去除效果不佳。该系统在冬季对粪便大肠菌群的去除能力不足，出水粪便大肠菌群含量为4.7×10⁵ 菌落形成单位/100毫升。在温暖季节，氮去除量中80%通过植物吸收，5%通过沉淀，15%去向不明。浮萍产量达到每公顷每8个月33吨干物质。
