Mechanism Study on a Combined Denitrification Approach for Nitrate-Contaminated Groundwater Remediation

HUANG Guo-xin; GAO Yun-he; Howard Fallowfield; Huade Guan; LIU Fei

2012 Vol. 31, No. 5

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HUANG Guo-xin, GAO Yun-he, Howard Fallowfield, Huade Guan, LIU Fei. Mechanism Study on a Combined Denitrification Approach for Nitrate-Contaminated Groundwater Remediation[J]. Rock and Mineral Analysis, 2012, 31(5): 855-862.

Citation:

Mechanism Study on a Combined Denitrification Approach for Nitrate-Contaminated Groundwater Remediation

1.
China Meat Research Center, Beijing 100068, China
2.
Shenyang Water Group Co., Shenyang 110003, China
3.
School of the Environment, Flinders University, Sturt Road, Bedford Park, SA 5001, Australia
4.
School of the Environment, Flinders University, Sturt Road, Bedford Park, SA 5001, Australia
5.
Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences(Beijing), Beijing 100083, China

Received Date: 01 March 2012

Publish Date: 28 October 2012

Abstract

Abstract

Nitrate in groundwater has become a worldwide environmental and public health issue. Nitrate can cause methaemoglobinaemia, septicemia, hepatopathy, and even cancers. Currently, single chemical reduction (CR), autotrophic denitrification (AD) and heterotrophic denitrification (HD) have been reported worldwide, however their combined denitrification approaches are rarely studied. In this paper the denitrification capacities, by products, pathways and mechanisms of a combined denitrification approach via batch experiments are explored, which are supported by zero valent iron, methanol and mixed bacteria. The results indicate that the elimination rates of 5.79%, 14.30% and 63.03% were achieved by single zero valent iron-based CR, AD and HD respectively after 5 days, whereas close to 100% was attained by the combined approach. The combined approach is superior to single CR, AD or HD. Nitrite accumulation did not occur in the single CR or AD, but did take place in the single HD. Ammonium variations of in situ remediation.
- zero /
- valent /
- iron-based /
- chemical /
- reduction /
- autotrophic