| Summary: | 碩士 === 國立交通大學 === 環境工程系所 === 102 === Anammox has been regarded as the most cost effective and efficient nitrogen removal process. However, its real world applications are limited due to long start-up time. Moreover, heavy metals such as zinc are common in several wastewater streams and can affect the anammox process. Therefore, in this study novel carriers were used to retain biomass for fast start-up of the simultaneous partial nitrification, anammox and denitrification (SNAD) process in a sequencing batch reactor (SBR) and the short- and long-term effects of the zinc on the SNAD process were investigated. The SNAD process was started up in 51 days and within one month the biomass attached to the carriers in the form of biofilm. Nitrogen and COD removal efficiencies were over 90% when the NLR and OLR increased to 360 and 180 g/m3-d, respectively. The short-term effect of zinc on the anammox activity was evaluated using batch tests. The IC50 of zinc at 24 h exposure time was 6.9 mg/L. The long-term effect of zinc on the SNAD process was examined in SBR. The NH4+-N, TN and COD removal efficiencies at 100 mg/L zinc concentration were 98, 97, and 86%, respectively. These results suggested that carrier used are efficent in biomass retention inside the reactor and it is feasible to treat zinc containing nitrogen rich wastewater by SNAD process.
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