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- Title
Biological Denitrification Using Corncobs as a Carbon Source and Biofilm Carrier.
- Authors
Xu, Zu-xin; Shao, Liu; Hal-long Yin; Chu, Hua-qiang; Yao, Yi-jun
- Abstract
In this research, agricultural waste—in particular, comcobs—was investigated for use as the sole carbon source and biofllm carrier to remove nitrate from wastewater in up.fiow laboratory reactors. An artificial wastewater with a temperature range of 27 to 33°C was used. Fast startup of the reactor and a high nitrate removal efficiency were observed. The highest denitrification rate of 0.203kg/(m3 . d) was achieved when flow rate and nitrate concentration were 153 L/d and 25.3 mgNIL, respectively. The accumulation of nitrite was not observed in this process. Moreover, flow rate and nitrate Concentration of the influent were observed to have a significant effect on nitrate removal efficiency. A sharp decline of nitrate removal efficiency was observed when the flow rate was greater than 50 LId. The reactor had the ability to accommodate a wide range of pH levels (6.5 to 8.5) and dissolved oxygen (1.5 mg/L to 4 mg/L). A time-dependent decrease in nitrate removal efficiency was observed after 67 days of operation. The addition of fresh comcobs brought about a rapid increase of nitrate removal efficiency. Results showed that comcobs could be used as an economical and effective carbon source for denitrification. Water Environ. Res., 81, 242 (2009).
- Subjects
AGRICULTURAL wastes; CORNCOBS; BIOFILMS; WASTEWATER treatment; NITRATES; DENITRIFICATION
- Publication
Water Environment Research (10614303), 2009, Vol 81, Issue 3, p242
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143008X325683