Browsing by Author "Su, Sin-Han"

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Nitrogen removal from opto-electronic wastewater using the simultaneous partial nitrification, anaerobic ammonium oxidation and denitrification (SNAD) process in sequencing batch reactor
(2012-06-01)
Daverey, Achlesh
;
Su, Sin-Han
;
Huang, Yu-Tzu
;
Lin, Jih-Gaw
;
環境工程研究所
Simultaneous partial nitrification, anaerobic ammonium oxidation and denitrification (SNAD) system was applied to treat the opto-electronic industrial wastewater in a 2.5 L sequencing batch reactor. The characteristics of wastewater were low C/N ratio (similar to 0.2) with 100 mg-COD/L and 567 mgNH(4)(+)-N/L. The experiment was carried out over 8 months in six different stages, where nitrogen loading rate was gradually increased from 16 g-N/m(3) d in stage I to 230 g-N/m(3) d in stage VI. The COD and nitrogen removal rates by the SNAD system reached to 28 g COD/m(3) d and 197 g NH4+-N/m(3) d, respectively in stage VI. These results showed that the SNAD system is suitable to treat wastewater containing high nitrogen pollutants with low COD level. Presence of ammonium oxidizing bacteria and anammox bacteria were confirmed by polymerase chain reaction (PCR). PCR results also indicated that Candidatus Kuenenia stuttgartiensis may be one of the dominant species in the reactor. (C) 2011 Elsevier Ltd. All rights reserved.
Partial nitrification and anammox process: A method for high strength optoelectronic industrial wastewater treatment
(2013-06-01)
Daverey, Achlesh
;
Su, Sin-Han
;
Huang, Yu-Tzu
;
Chen, Shiou-Shiou
;
Sung, Shihwu
Completely autotrophic nitrogen removal over nitrite (CANON) process was employed in an 18 L sequencing batch reactor (SBR) for treatment of optoelectronic industrial wastewater containing high strength ammonium nitrogen (3712 +/- 120 mg NH4+ - N L-1). About 89% of total nitrogen and 98% of NH4+ - N removal efficiencies were observed at the loading rate of 909 g N m(-3) d(-1) and the HRT of 4 d. A profound variation in the performance of CANON process was experienced at high DO exposure (above 1 mg L-1) and high nitrite concentration (above 100 mg L-1). Inhibition due to high DO exposure was found to be reversible phenomenon whereas the synergistic inhibition of nitrite, free ammonia and free nitrous acid was irreversible. The fluctuation of reactor temperature between 17 and 37 degrees C did not affect the performance of CANON system. The CANON process was stably controlled at high nitrogen loading rate for more than one month. The co-existence of aerobic and anaerobic ammonium oxidizing bacteria in the reactor was detected by The PCR analysis. About 5 fold increase in amount of anammox bacteria over a period of 258 days was confirmed from the results of qPCR on day 487. (C) 2013 Elsevier Ltd. All rights reserved.