NDLI: Column Experiment on Nitrate Purification with Polylactic Acid and Iron Powder

Content Provider	Springer Nature Link
Author	Soejima, Takamichi Itoh, Masako Imamura, Satoshi
Copyright Year	2010
Abstract	Groundwater contamination by nitrates is a worldwide problem, but to date there have been no effective measures to purify contaminated groundwater. If a denitrifying system can be constructed in aquifers, it will be able to purify groundwater in situ. This purifying system should also be maintenance free. The purpose of our work is to construct a maintenance-free denitrification system for in situ groundwater purification. This paper presents the result of a basic study on a maintenance-free denitrification system using biodegradable plastic and iron powder. A biodegradable plastic (polylactic acid, PLA) and iron powder were used as detergents, and the nitrate-contaminated groundwater was injected from the bottom of a packed silica sand column filled with a mixture of the detergents. Laboratory experiments were carried out, varying factors such as molecular weight of the biodegradable plastic and mixing ratio of the detergents. Water that permeated through the purification column was sampled to determine the decrease in nitrate concentration. The experimental results suggest that a combination of PLA and iron powder seems effective for denitrification, and that the rate of the PLA degradation is closely related to the molecular weight of the PLA and iron powder content. In this case iron powder acts as accelerator in denitrification. It is concluded that a maintenance-free denitrification system can be built, using PLA and iron powder as detergents. The proposed system may also be used in a wide range of nitrate contamination conditions, adjusting the molecular weight of the PLA and the mixing ratio of the detergents.
Starting Page	485
Ending Page	492
Page Count	8
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	213
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrate contamination Denitrification Biodegradable plastic Groundwater Polylactic acid Climate Change Hydrogeology Soil Science & Conservation Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Environment
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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