Browsing by Author "Chen, Yi-Chian"

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Effect of zinc on anammox activity and performance of simultaneous partial nitrification, anammox and denitrification (SNAD) process
(2014-08-01)
Daverey, Achlesh
;
Chen, Yi-Chian
;
Sung, Shihwu
;
Lin, Jih-Gaw
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環境工程研究所
In the present study, short-term effects of zinc on anammox activities and long-term effect of zinc on the performance of simultaneous partial nitrification, anammox and denitrification (SNAD) process were evaluated. The anammox activity decreased with increasing zinc concentration and exposure time in short-term tests. The IC50 value of zinc was found to be 6.9 mg/L. However, the presence of zinc (<10 mg/L) in wastewater stimulated the microbial activities and nitrogen removal performance of SNAD process in sequencing batch biofilm reactor (SBBR). At first, inhibition of SNAD process was observed when influent zinc concentration increased to 20 mg/L. The system recovered immediately, suggesting the acclimatization of microbial communities of SNAD process. The results showed that SBBR was well acclimatized under high zinc concentration (50-100 mg/L) achieving 98% NH4+-N, 96% TN and 87% COD removal efficiencies. (C) 2014 Elsevier Ltd. All rights reserved.
Start-up of simultaneous partial nitrification, anammox and denitrification (SNAD) process in sequencing batch biofilm reactor using novel biomass carriers
(2015-08-01)
Daverey, Achlesh
;
Chen, Yi-Chian
;
Dutta, Kasturi
;
Huang, Yu-Tzu
;
Lin, Jih-Gaw
Simultaneous partial nitrification, anammox and denitrification (SNAD) process was started-up in a 2.5 L sequencing batch biofilm reactor (SBBR) using novel biomass carriers. The SNAD process took only 51 d for start-up at nitrogen loading rate (NLR) and organic loading rate (OLR) of 120 and 60 g/m(3)-d, respectively. Long-term stable operation of SNAD process was observed at NLR and OLR of 360 and 180 g/m(3)-d with average total nitrogen and COD removal efficiencies of >88% and >90%, respectively. The values of conversion ratio Y(NO2-+NO3-)/NH4+ remained below 0.11 after the start-up period, which further confirmed the long-term stability of SNAD process. Results of polymerase chain reaction (PCR), qualitative PCR, and scanning electron microscopic (SEM) analysis of sludge samples confirmed the co-existence and enrichment of AOB, anammox bacteria and denitrifying bacteria in the reactor and biofilm formation on to the carriers. (C) 2015 Elsevier Ltd. All rights reserved.