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Application of FT-IR Spectroscopy for Investigation of Pink Water Remediation by Pine Bark
Latvia University, Latvia.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
Latvia University, Latvia.
Latvia University, Latvia.
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2015 (English)In: Open Biotechnology Journal, ISSN 1874-0707, Vol. 9Article in journal (Refereed) Published
Abstract [en]

This study demonstrates the application of FT-IR spectroscopy for investigating the remediation of pink water with the low cost adsorbent pine bark. The removal of 2,4,6-trinitrotoluene (TNT) from pink water by adsorption to pine bark was accompanied by a reduction in intensities of peaks at 1544 and 1347 cm-1 in the spectra of acetonitrile extracts of the pine bark. Hierarchial cluster analysis differentiated samples with high (30-180 mg/L) and low (0-4 mg/L) TNT concentrations, demonstrating the potential of this approach as a quick screening method for the control of the removal of TNT from pink water. The amount of lignin in pine bark was inversely proportional to the size of the pine bark particles, while the concentration of phenolic hydroxyl groups increases with increasing size of pine bark particles. FT-IR spectra showed that as well as TNT, pine bark can also adsorb nitramine explosives such as RDX and HMX.

Place, publisher, year, edition, pages
2015. Vol. 9
National Category
Natural Sciences Water Treatment
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-28835DOI: 10.2174/1874070720150430E007OAI: oai:DiVA.org:mdh-28835DiVA: diva2:851192
Projects
BIOEX
Funder
Knowledge Foundation
Available from: 2015-09-03 Created: 2015-09-03 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Remediation of TNT-contaminated water by using industrial low-cost residue pine bark
Open this publication in new window or tab >>Remediation of TNT-contaminated water by using industrial low-cost residue pine bark
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the process of demilitarization of explosives, army ammunition plants generate a waste stream known as pink water. The principal component of the wastewater is the nitro-aromatic compound 2,4,6-trinitrotoluene (TNT). Although the persistence of TNT when dissolved in surface water is very limited due to its susceptibility to photo- and biotransformation, discharge of pink water to the environment has been prohibited in Sweden, the U.S. and many other countries for decades because of the toxicity of the compound and its metabolites to various ecological receptors.

The most frequently used method for treatment of pink water in Sweden today is adsorption on activated carbon, which as well as being costly, creates a sludge that must be incinerated off site.

In many countries, the timber industry residue pine bark is discarded and has no high value application. The overall aim of this thesis was to investigate the potential of pine bark for the removal of TNT from contaminated water such as pink water. Several batch studies and a column experiment were conducted. Acetonitrile extraction of pine bark and 16S rRNA sequencing for analysis of the indigenous bacterial community of pine bark were used to investigate its performance in the treatment of pink water.

The results show that pine bark has great potential as an adsorbent medium for TNT from contaminated pink water. Simultaneous use of biotransformation and adsorption methods was shown to be an improvement over adsorption alone for the removal of TNT from contaminated water bodies. Pine bark showed higher affinity towards the amino metabolites of TNT than for TNT itself. Molecular analysis of the indigenous microbial community of pine bark and chemical analysis of its acetonitrile extracts provided evidence for its ability to biotransform TNT and its metabolites. The efficiency of the transformation was enhanced by the addition of glucose and/or inoculum.

Overall, this work demonstrates the versatility of this organic industrial residue with respect to pink water treatment. Not only does it have a high affinity towards TNT and its amino metabolites, but its native microbial community even in the absence of external inoculation can also be taken advantage of, opening new possibilities for remediation of pink water.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 183
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-28839 (URN)978-91-7485-226-4 (ISBN)
Public defence
2015-09-29, Gamma, Mälardalens högskola, Västerås, 10:00 (English)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2015-09-04 Created: 2015-09-03 Last updated: 2015-09-22Bibliographically approved

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