Effects of HRT and water temperature on nitrogen removal in autotrophic gravel filter

Chemosphere
Jing-hang XuXue-chu Chen

Abstract

Organic Carbon added to low ratio of carbon to nitrogen (C/N ratio) wastewater to enhance heterotrophic denitrification performance might lead to higher operating costs and secondary pollution. In this study, sodium thiosulfate (Na2S2O3) was applied as an electron donor for a gravel filter (one kind of constructed wetland) to investigate effects of hydraulic retention time (HRT) and water temperature on the nitrate removal efficiency. The results show that with an HRT of 12 h, the average total nitrogen (TN) removal efficiencies were 91% at 15-20 °C and 18% at 3-6 °C, respectively. When HRT increased to 24 h, the average TN removal increased accordingly to 41% at 3-6 °C, suggesting denitrification performance was improved by extended HRT at low water temperatures. Due to denitrification, 96% of added nitrate nitrogen (NO3(-)-N) was converted to nitrogen gas, with a mean flux of nitrous oxide (N2O) was 0.0268-0.1500 ug m(-2) h(-1), while 98.86% of thiosulfate was gradually converted to sulfate throughout the system. Thus, our results show that the sulfur driven autotrophic denitrification constructed wetland demonstrated an excellent removal efficiency of nitrate for wastewater treatment. The HRT and water temperature proved to ...Continue Reading

References

May 7, 2003·Environmental Science & Technology·Achintya N Bezbaruah, Tian C Zhang
May 20, 2008·The Science of the Total Environment·Ulo ManderJürgen Augustin
May 19, 2009·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Guenter LangergraberJavier Mena

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Citations

Jan 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yanjun MaoTao Liu
Jan 9, 2021·Environmental Science and Pollution Research International·Jacineumo Falcão de OliveiraThaís Caroline da Cruz
Dec 28, 2019·Journal of Hazardous Materials·Jianping LuAlistair G L Borthwick

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