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Use of permeable reactive barrier to mitigate groundwater nitrate contamination from on-site sanitation

Rao, Sudhakar M and Malini, R (2015) Use of permeable reactive barrier to mitigate groundwater nitrate contamination from on-site sanitation. In: JOURNAL OF WATER SANITATION AND HYGIENE FOR DEVELOPMENT, 5 (2). pp. 336-340.

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Official URL: http://dx.doi.org/ 10.2166/washdev.2015.159

Abstract

Nearly 50% of India's population depends on variants of pit-toilet systems for human waste disposal. Nitrate contamination of groundwater by pit-toilet leachate is a major environmental concern in the country as it sources a major proportion (50-80%) of potable water from aquifers. Therefore, minimizing nitrate contamination of groundwater due to leachate infiltration from pit-toilet systems is essential. Batch and column experiments demonstrated the capability of bentonite-enhanced sand (BES) specimens to reduce nitrate concentrations in synthetic solutions (initial NO3-N concentration = 22.7 mg/L, C/N = 3) by about 85-90% in 10 to 24 hour by a heterotrophic denitrification process. Based on the laboratory results, it is recommended that use of a BES-permeable reactive barrier layer at the base of pit-toilets will facilitate heterotrophic denitrification and mitigate nitrate contamination of the underlying aquifer.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IWA PUBLISHING, ALLIANCE HOUSE, 12 CAXTON ST, LONDON SW1H0QS, ENGLAND
Keywords: contamination; groundwater; nitrate; on-site sanitation; permeable reactive barrier
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Division of Mechanical Sciences > Civil Engineering
Depositing User: Id for Latest eprints
Date Deposited: 19 Jul 2015 09:42
Last Modified: 19 Jul 2015 09:42
URI: http://eprints.iisc.ac.in/id/eprint/51895

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