Treatment of Domestic Sewage by Aquatic Ribbon System,
NATIONAL CHENG KUNG UNIV TAINAN (TAIWAN) DEPT OF ENVIRONMENTAL ENGINEERING
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The aquatic-ribbon fixed-film biological treatment process discussed in this paper is a newly developed treatment technology, which is capable of achieving removal of soluble BOD, nitrification, and denitrification form domestic or municipal wastewaters at a level similar to conventional rotating biological contactors RBCs. Under the experimental conditions in this study, the pilot aquatic ribbon treatment system was capable of removing more than 91 of the total 5-day BOD at a hydraulic detention of 16 hours providing 94 nitrification at a hydraulic detention time of 8 hours and achieving 87 denitrification at a hydraulic detention time of 2 hours. The combination of the liquid-solids separation process with the aquatic ribbon reactor into one physical unit is a unique feature of the aquatic ribbon fixed-film biological treatment system. This feature effectively eliminates the need for a separate clarifier and thus should result in a cost-savings for aquatic-ribbon systems compared to conventional RBC systems.