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Effect of pine bark on the biotransformation of trinitrotoluene and on the bacterial community structure in a batch experiment
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51014, Estonia.
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.ORCID-id: 0000-0003-3311-9465
University of Tartu, Estonia.
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2014 (Engelska)Ingår i: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 35, nr 19, s. 2456-2465Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Pine bark, a low-cost industrial residue, has been suggested as a promising substitute for granular activated carbon in the on-site treatment of water contaminated with 2,4,6-trinitrotoluene (TNT). However, the complex organic structure and indigenous microbial community of pine bark have thus far not been thoroughly described in the context of TNT-contaminated water treatment. This two-week batch study examined the removal efficiency of TNT from water by (1) adsorption on pine bark and (2) simultaneous adsorption on pine bark and biotransformation by specialized TNT-biotransforming microbial inocula. The bacterial community composition of experimental batches, inocula and pine bark, was profiled by Illumina sequencing of the V6 region ofthe 16S rRNA gene. The results revealed that the inocula and experimental batches were dominated by phylotypes belonging to the Enterobacteriaceae family and that the tested inocula had good potential for TNT biotransformation. The type of applied inocula had the most profound effect on the TNT-transforming bacterial community structure in the experimental batches. The indigenous microbial community of pine bark harboured phylotypes that also have a potential to degrade TNT. Altogether, the combination of a specialized inoculum and pine bark proved to be the most efficient treatment option for TNT-contaminated water.

Ort, förlag, år, upplaga, sidor
2014. Vol. 35, nr 19, s. 2456-2465
Nationell ämneskategori
Naturvetenskap Vattenbehandling
Identifikatorer
URN: urn:nbn:se:mdh:diva-25024DOI: 10.1080/09593330.2014.909888ISI: 000337615000007Scopus ID: 2-s2.0-84902785939OAI: oai:DiVA.org:mdh-25024DiVA, id: diva2:718858
Tillgänglig från: 2014-05-22 Skapad: 2014-05-22 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Remediation of TNT-contaminated water by using industrial low-cost residue pine bark
Öppna denna publikation i ny flik eller fönster >>Remediation of TNT-contaminated water by using industrial low-cost residue pine bark
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Västerås: Mälardalen University, 2015
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 183
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-28839 (URN)978-91-7485-226-4 (ISBN)
Disputation
2015-09-29, Gamma, Mälardalens högskola, Västerås, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2015-09-04 Skapad: 2015-09-03 Senast uppdaterad: 2015-09-22Bibliografiskt granskad

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