dc.contributor.author |
Rava, Eleonora Maria Elizabeth
|
|
dc.contributor.author |
Chirwa, Evans M.N.
|
|
dc.date.accessioned |
2016-07-04T06:59:11Z |
|
dc.date.issued |
2016-05 |
|
dc.description.abstract |
The purpose of this study was to determine the effect different biofilm carrier filling ratios would have on biofilm morphology and activity and
bacterial diversity in a hybrid fixed-film bioreactor treating high strength coal gasification wastewater (CGWW) for the removal of chemical
oxygen demand (COD), phenols and ammonia-nitrogen. Results showed that a carrier fill of 70% formed a ‘compact’ biofilm, a 50% fill formed
a ‘rippling’ biofilm and a 30% fill formed a ‘porous’ biofilm. The highest microbial activity was obtained with a 50% carrier fill supporting a
relatively thin biofilm. The highest level of biofilm bound metals were aluminium, silicon, calcium and iron in the ‘compact’ biofilm; nitrogen,
magnesium, chloride, sodium and potassium in the ‘rippling’ biofilm, and copper in the ‘porous’ biofilm. The bioreactor improved the quality
of the CGWW by removing 49% and 78% of the COD and phenols, respectively. However, no significant amount of ammonia-nitrogen was
removed since nitrification did not take place due to heterotrophic bacteria out-competing autotrophic nitrifying bacteria in the biofilm. The
dominant heterotrophic genera identified for all three carrier filling ratios were Thauera, Pseudaminobacter, Pseudomonas and
Diaphorobacter. |
en_ZA |
dc.description.department |
Chemical Engineering |
en_ZA |
dc.description.embargo |
2016-11-30 |
|
dc.description.librarian |
hb2016 |
en_ZA |
dc.description.sponsorship |
Buckman Africa and the University of Pretoria. |
en_ZA |
dc.description.uri |
http://wst.iwaponline.com |
en_ZA |
dc.identifier.citation |
Rava, E & Chirwa, E 2016, 'Effect of carrier fill ratio on biofilm properties and performance of a hybrid fixed-film bioreactor treating coal gasification wastewater for the removal of COD, phenols and ammonia-nitrogen', Water Science and Technology, vol. 73, no. 10, pp. 2461-2467. |
en_ZA |
dc.identifier.issn |
0273-1223 (print) |
|
dc.identifier.issn |
1996-9732 (online) |
|
dc.identifier.other |
10.2166/wst.2016.108 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/53600 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
IWA Publishing |
en_ZA |
dc.rights |
© IWA Publishing 2016. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, vol. 73, no. 10, pp. 2461-2467, 2016. doi: 10.2166/wst.2016.108 and is available at : http://www.iwaponline.com. |
en_ZA |
dc.subject |
Anox-kaldness |
en_ZA |
dc.subject |
Biofilm |
en_ZA |
dc.subject |
Next-generation sequencing |
en_ZA |
dc.subject |
Nitrification |
en_ZA |
dc.subject |
Pollutants |
en_ZA |
dc.subject |
Thauera |
en_ZA |
dc.subject |
Coal gasification wastewater (CGWW) |
en_ZA |
dc.subject |
Chemical oxygen demand (COD) |
en_ZA |
dc.title |
Effect of carrier fill ratio on biofilm properties and performance of a hybrid fixed-film bioreactor treating coal gasification wastewater for the removal of COD, phenols and ammonia-nitrogen |
en_ZA |
dc.type |
Postprint Article |
en_ZA |