Title

Bioaugmentation of Sequencing Batch Reactors for Biological Phosphorus Removal: Comparative rRNA Sequence Analysis and Hybridization with Oligonucleotide Probes

Abstract

Four laboratory-scale sequencing batch reactors (SBRs) were operated to evaluate whether bioaugmentation with Acinetobacter spp. can be used to improve start-up and performance of enhanced biological phosphorus removal (EBPR) systems. Two of the SBRs were bioaugmented during start-up by adding pure cultures of Acinetobacter spp., the third reactor received an amendment of activated sludge from a laboratory-scale EBPR system, and the fourth reactor, receiving no amendment, served as a control. Various chemical parameters were measured to monitor the performance of the four SBRS. Oligonucleotide probes of nested phylogenetic specificity were designed to quantify the contribution of Acinetobacter to EBPR. The probes were characterized for use in quantitative membrane hybridizations and fluorescent in situ hybridizations. Data from hybridizations with samples collected from the SBRs show declining levels of Acinetobacter spp. over the experiment. All four reactors achieved significant phosphorus removal and 90% nitrification after three days of operation. The results do not show a positive correlation between levels of Acinetobacter and successful EBPR. Four laboratory-scale sequencing batch reactors (SBRs) were operated to evaluate whether bioaugmentation with Acinetobacter spp. can be used to improve start-up and performance of enhanced biological phosphorus removal (EBPR) systems. Two of the SBRs were bioaugmented during start-up by adding pure cultures of Acinetobacter spp., the third reactor received an amendment of activated sludge from a laboratory-scale EBPR system, and the fourth reactor, receiving no amendment, served as a control. Various chemical parameters were measured to monitor the performance of the four SBRS. Oligonucleotide probes of nested phylogenetic specificity were designed to quantify the contribution of Acinetobacter to EBPR. The probes were characterized for use in quantitative membrane hybridizations and fluorescent in situ hybridizations. Data from hybridizations with samples collected from the SBRs show declining levels of Acinetobacter spp. over the experiment. All four reactors achieved significant phosphorus removal and 90% nitrification after three days of operation. The results do not show a positive correlation between levels of Acinetobacter and successful EBPR.

Meeting Name

2nd International Conference on Microorganisms in Activated Sludge and Biofilm Processes (1997: Jul. 21-23, Berkeley, CA)

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Activated sludge process; Bacteria; Bioreactors; Nucleic acid sequences; Phosphates; RNA; Bioaugmentation; Enhanced biological phosphorus removal; Biological sewage treatment; phosphorus; ribosome rna; acinetobacter; activated sludge; bacterium culture; bioreactor; conference paper; controlled study; fluorescence in situ hybridization; nonhuman; oligonucleotide probe; phylogeny; Acinetobacter

International Standard Serial Number (ISSN)

02731223

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1998 Elsevier Sci Ltd, Exeter, United Kingdom, All rights reserved.


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