Browsing by Author "Lan, Chien-Ju"

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Development of simultaneous partial nitrification, anammox and denitrification (SNAD) process in a sequential batch reactor
(2011-05-01)
Lan, Chien-Ju
;
Kumar, Mathava
;
Wang, Chih-Cheng
;
Lin, Jih-Gaw
;
環境工程研究所
Simultaneous partial nitrification, anammox and denitrification (SNAD) process was developed in a sequential batch reactor (SBR) and the influence of hydraulic retention time (HRT) on the SNAD process was investigated. Around 96% NH(4)(+)-N removal and 87% COD removal were observed at 9 d HRT. Marginal decreases in the removal efficiencies were observed when the HRT was reduced to 3 d or the loading rate was increased by three times. On the other hand, a drastic decrease in NH(4)(+)-N and COD removals were observed when the DO, pH and temperature were dropped shockingly. The response of the SNAD system towards the shock in substrate loading and operating conditions was evaluated by sensitivity index. Finally, the extent of total nitrogen (TN) removal by partial nitrification with anammox and denitrification was modeled using stoichiometric relationship. Modeling results indicated a TN removal of 85-87% by anammox with partial nitrification and 7-9% by denitrification. (C) 2010 Elsevier Ltd. All rights reserved.
Landfill-leachate treatment by simultaneous partial nitrification, anammox and denitrification (SNAD) process
(2011-08-01)
Wang, Chih-Cheng
;
Kumar, Mathava
;
Lan, Chien-Ju
;
Lin, Jih-Gaw
;
環境工程研究所
Simultaneous partial nitrification, anammox and denitrification (SNAD) process was developed in a sequential batch reactor (SBR), and the application of SNAD process for landfill-leachate treatment was investigated. The SNAD process was developed from the biomass of a full-scale landfill-leachate treatment plant. After the adaptation of biomass, the SBR was operated in four stages (I-IV) with varying nitrogen loading rates (NLRs), i.e. 118-280 mg-N/L/d, and organic loading rates (OLRs), i.e. 100-200 mg/L/d. The increase in the NLR has proportionately reduced the NH(4)(+)-N removal. However, the NO(2)(-)-N concentration was close to zero and the NO(3)(-)-N concentration was less than 36 mg/L in all the stages. A consistent chemical oxygen demand (COD) removal was observed in stages I to IV, which indicate that the SBR was not affected by the increase or decrease of the OLR. The total nitrogen removal in the SBR was mainly achieved by partial nitrification and anammox (69-88%) that was evaluated by a stoichiometric model. Moreover, the influence of NLR and OLR on the SNAD process was determined based on sensitivity index (SI). The SI values indicate that the SNAD process was highly affected by the influent NH(4)(+)-N compared to COD.