Optimization of nitrate removal from wastewater with a low C/N ratio using solid-phase denitrification

Environmental Science and Pollution Research International
Qian ZhangXiaoyi Xu

Abstract

In this study, the optimization of nitrate removal from wastewater with a low C/N ratio using solid-phase denitrification was investigated. Biodegradable polymer, an attractive alternative to liquid carbon sources for biological denitrification, was used as a carbon source and biofilm support for nitrate removal. An experiment was conducted based on a central composite design (CCD) with response surface methodology (RSM). A secondary polynomial regression with nitrate removal efficiency as response value was developed. Based on statistical analysis, the nitrate removal model was highly significant with very low probability values (<0.0001). At the optimal conditions for nitrate removal (hydraulic retention time (HRT), 3.5 h; influent NO3 (-)-N concentration, 14.73 mg/L; and influent CODCr concentration, 15.00 mg/L), the nitrate removal efficiency was 99.23 %. The results of an ANOVA and response surface analysis showed that HRT, influent NO3 (-)-N concentration, influent CODCr concentration, and the interaction between the HRT and influent CODCr concentration significantly affected the nitrate removal efficiency (P < 0.05). In solid-phase denitrification process, electron donor for denitrification could be obtained by biologica...Continue Reading

References

Mar 26, 2003·Applied Microbiology and Biotechnology·A Hiraishi, S T Khan
Aug 12, 2008·Bioresource Technology·Mary Ann Robinson-Lora, Rachel A Brennan
Feb 4, 2010·Journal of Hazardous Materials·Cristina TroisLaurent Oxarango
May 9, 2012·Environmental Science and Pollution Research International·Weizhong WuJianlong Wang

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