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Structure and function of slow release organic carbon source in groundwater in-situ denitrification

Research output: Contribution in Book/Report/ProceedingsPaper

Published

Publication date2006
Host publication5th World Water Congress: drinking water treatment processes : selected papers of the 5th World Water Congress of the International Water Association held in Beijing, China, 10-14 September 2006
EditorsHelmut Kroiss
Place of publicationLondon
PublisherI W A PUBLISHING
Pages105-113
Number of pages9
ISBN (Print)978-1-84339-587-4
Original languageEnglish

Conference

Conference5th World Water Congress of the International-Water-Association
CityBeijing
Period10/09/0614/09/06

Publication series

NameWATER SCIENCE AND TECHNOLOGY: WATER SUPPLY
PublisherI W A PUBLISHING
Volume6
ISSN (Print)1606-9749

Conference

Conference5th World Water Congress of the International-Water-Association
CityBeijing
Period10/09/0614/09/06

Abstract

Many nitrate pollution cases exceed the threshold as recommended by the World Health Organization (50 mg NO3/L) and by the USA (10 mg N/L) for drinking water. In-situ denitrification was regarded as a good method to decrease nitrate contamination but is restricted by carbon absent in groundwater. Considering the disadvantages of known carbon sources, this paper provided slow-release organic carbon-source (SOC) technique to solve the problem and the results showed that SOC materials showed good performance during simulated groundwater denitrification. Structure analysis suggested that hydroxy chemical bond existed between PVA and starch in SOC and surface configuration changed with materials dissolving into water. After seven days of domestication, with 40-50 mg/L initial NO3-N, denitrification efficiency increased from 80.6% to 90.7% and the real COD consumption per N-NO3 reduction was 1.82-3.73 with 2.79 as average. Denitrification process followed the law of zero order kinetics and the parameter of denitrification dynamics, K, was from 0.1366 to 0.1873. It was suggested that SOC was a potential carbon source material (electron donor) suitable for in-situ groundwater denitrification.