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Engineering difference: Matrix design determines community composition in wastewater treatment systems

Lookup NU author(s): Dr Joana Baptista, Professor Thomas Curtis

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Abstract

There is a growing view that the application of ecological theory has the potential to facilitate a transition from a descriptive to a predictive framework in wastewater engineering. In this study we tested the hypotheses that: (i) it is possible to engineer consistent differences between microbial communities in wastewater treatment modules; (ii) there is a positive relationship between structural complexity and genetic diversity; (iii) such interactions are modulated by the availability of energy. We developed four treatment modules of increasingly complex support material (matrix) design, and pumped a synthetic wastewater through them for 16 weeks. We then disassembled the modules and assessed the phylogenetic (general eubacteria and ammonium oxidisers, by DGGE profiling) and phenotypic (by PLFA profiling) diversity of the communities present on the support materials. We found that different genotypic and phenotypic community structures were reliably generated by the engineering of their physical environment in terms of structural complexity (as determined by particle size distribution and therefore pore size distribution). Furthermore, there was a notably consistent response of the phenotypic structure to such circumstances, and also to the presence of organic matter. However, we found no significant relationships between genetic diversity and structural complexity either for eubacterial or ammonia-oxidiser microbial groups. This work demonstrates that is it possible to engineer modules of differing microbial community composition by varying their physical complexity. This is an essential first step in testing relationships between system diversity and treatment resilience at a process level. (C) 2012 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Harris JA, Baptista JDC, Curtis TP, Nelson AK, Pawlett M, Ritz K, Tyrrel SF

Publication type: Article

Publication status: Published

Journal: Ecological Engineering

Year: 2012

Volume: 40

Pages: 183-188

Print publication date: 16/01/2012

ISSN (print): 0925-8574

ISSN (electronic): 1872-6992

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.ecoleng.2011.12.016

DOI: 10.1016/j.ecoleng.2011.12.016


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