A5067766228- Constructed Wetlands for Wastewater Treatment
- Wastewater Treatment and Nitrogen Removal
- Coastal wetland ecosystem dynamics
- Microbial Community Ecology and Physiology
- Microbial bioremediation and biosurfactants
- Plant responses to water stress
- Microbial Metabolic Engineering and Bioproduction
- Peatlands and Wetlands Ecology
- Microbial metabolism and enzyme function
- Microplastics and Plastic Pollution
- Wastewater Treatment and Reuse
- biodegradable polymer synthesis and properties
- Urban Stormwater Management Solutions
- Heavy metals in environment
- Recycling and Waste Management Techniques
- Tailings Management and Properties
- Mine drainage and remediation techniques
- Protist diversity and phylogeny
- Landfill Environmental Impact Studies
- Legionella and Acanthamoeba research
- Mining and Resource Management
- Radioactive element chemistry and processing
- Groundwater and Isotope Geochemistry
- Metal Extraction and Bioleaching
- Anaerobic Digestion and Biogas Production
Helmholtz Centre for Environmental Research
2013-2022
University of the Witwatersrand
2017-2018
China Agricultural University
2013
Deutsches Biomasseforschungszentrum
2002
The fate of plastic waste and a sustainable use synthetic polymers is one the major challenges twenty first century. Waste valorization strategies can contribute to solution this problem. Besides chemical recycling, biological degradation could be promising tool. Among high diversity polymers, polyurethanes are widely used as foams insulation materials. In order examine bacterial biodegradability polyurethanes, soil bacterium was isolated from site rich in brittle waste. strain, identified...
In constructed wetlands, organic pollutants are mainly degraded via microbial processes. Helophytes, plants that commonly used in these systems, provide oxygen and root exudates to the rhizosphere, stimulating degradation. While treatment performance of wetlands can be remarkable, a mechanistic understanding degradation processes rhizosphere is still limited. We investigated toluene removal wetland model system combining 16S rRNA gene sequencing, metaproteomics (13) C-toluene situ...
Abstract The continuing reports of plastic pollution in various ecosystems highlight the threat posed by ever-increasing consumption synthetic polymers. Therefore, Pseudomonas capeferrum TDA1, a strain recently isolated from dump site, was examined further regarding its ability to degrade polyurethane (PU) compounds. previously reported degradation pathway for 2,4-toluene diamine, precursor and intermediate PU, could be confirmed RNA-seq this organism. In addition, different cell fractions...
ABSTRACT In the present study, microbial toluene degradation in controlled constructed wetland model systems, planted fixed-bed reactors (PFRs), was queried with DNA-based methods combination stable isotope fractionation analysis and characterization of toluene-degrading isolates. Two PFR replicates were operated as sole external carbon electron source for 2 years. The bulk redox conditions these systems hypoxic to anoxic. autochthonous bacterial communities, analyzed by Illumina sequencing...
Abstract The aim of this study was to investigate the removal ibuprofen in laboratory scale constructed wetlands. Four (planted and unplanted) laboratory‐scale horizontal subsurface flow wetlands were supplemented with order elucidate (i) role plants on (ii) evaluate performance a bioaugmented lab wetland. planted systems showed higher efficiency than an unplanted one. system Juncus effusus found have rate Phalaris arundinacea . highest after inoculation gravel previously loaded newly...
To characterize a methane-utilizing poly-beta-hydroxybutyrate (PHB)-producing microbial community.Three different approaches based on microbiology, analytical chemistry and molecular biology were used to determine the composition of mixed culture. The dominant species, Methylocystis sp. GB25, represents more than 86% total biomass. Seven accompanying bacterial species are present in culture which two methylotrophic bacteria five utilizers complex carbon sources. Both these groups found be at...
The effectiveness of three operational strategies for maintaining nitrifiers in bench-scale, aerated, submerged fixed-bed biofilm reactors (SFBBRs) during long-term starvation at 20 degrees C were evaluated. characterized by the resulting oxidation-reduction potential (ORP) SFBBRs. activity rates measured and decay was expressed half-life times. It found that anoxic alternating anoxic/aerobic conditions best ways to preserve ammonia-oxidizing bacteria (AOB) long periods resulted times up 34...
ABSTRACT Constructed wetlands (CWs) are successfully applied for the treatment of waters contaminated with aromatic compounds. In these systems, plants provide oxygen and root exudates to rhizosphere thereby stimulate microbial degradation processes. Root exudation organic compounds depends on photosynthetic activity thus may show day-night fluctuations. While diurnal changes in CW effluent composition have been observed, information respective fluctuations bacterial scarce. We investigated...
A good deal of experience has already been acquired concerning the building constructed wetlands. This study describes design and “process behavior” a recently developed test system called Planted Fixed Bed Reactor. Judging by findings, reactor presented here can be used as universal for studying processes taking place in
ABSTRACT Pseudomonas putida mt-2 harbors the TOL plasmid (pWWO), which contains genes encoding enzymes necessary to degrade toluene aerobically. The xyl are clustered in upper operon and encode of pathway that benzoate, while lower ( meta -cleavage pathway) for conversion benzoate tricarboxylic acid cycle intermediates, encoded a separate operon. In this study, effects oxygen availability oscillation on expression catabolic involved degradation were studied by using P. as model bacterium....
The physiology of the response in methanotrophic bacterium Methylococcus capsulatus Bath towards thermal and solvent stress was studied. A systematic investigation toxic effects organic compounds (chlorinated phenols alkanols) on growth this carried out. sensitivity to tested alkanols correlated with their chain length hydrophobicity; methanol shown be an exception which cells showed a very high tolerance. This can explained by adaptation these bacteria C1 compounds. On other hand, M....