UV influent and effluent
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA890043 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR21888620.fastq.gz | Fastqsanger.gz | |||
| SRR21888621.fastq.gz | Fastqsanger.gz | |||
| SRR21888622.fastq.gz | Fastqsanger.gz | |||
| SRR21888623.fastq.gz | Fastqsanger.gz | |||
| SRR21888624.fastq.gz | Fastqsanger.gz |
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Project description:Wastewater treatment plants use a variety of bioreactor types and configurations to remove organic matter and nutrients. Little is known regarding the effects of different configurations and within-plant immigration on microbial community dynamics. Previously, we found that the structure of ammonia-oxidizing bacterial (AOB) communities in a full-scale dispersed growth activated sludge bioreactor correlated strongly with levels of NO2- entering the reactor from an upstream trickling filter (Wells et al 2009). Here, to further examine this puzzling association, we profile within-plant microbial biogeography (spatial variation) and test the hypothesis that substantial microbial immigration occurs along a transect (raw influent, trickling filter biofilm, trickling filter effluent, and activated sludge) at the same full-scale wastewater treatment plant. AOB amoA gene abundance increased >30-fold between influent and trickling filter effluent concomitant with NO2- production, indicating unexpected growth and activity of AOB within the trickling filter. Nitrosomonas europaea was the dominant AOB phylotype in trickling filter biofilm and effluent, while a distinct ‘Nitrosomonas-like’ lineage dominated in activated sludge. Prior time series indicated that this ‘Nitrosomonas-like’ lineage was dominant when NO2- levels in the trickling filter effluent (i.e., activated sludge influent) were low, while N. europaea became dominant in the activated sludge when NO2- levels were high. This is consistent with the hypothesis that NO2- production may co-occur with biofilm sloughing, releasing N. europaea from the trickling filter into the activated sludge bioreactor. Phylogenetic microarray (PhyloChip) analyses revealed significant spatial variation in taxonomic diversity, including a large excess of methanogens in the trickling filter relative to activated sludge and attenuation of Enterobacteriaceae across the transect, and demonstrated transport of a highly diverse microbial community via the trickling filter effluent to the activated sludge bioreactor. Our results provide compelling evidence that substantial immigration between coupled process units occurs and may exert significant influence over microbial community dynamics within staged bioreactors.
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Project description:The mechanisms of metal accumulation and toxicity in primary producers are not well understood. In a previous study (deposited in ArrayExpress archive under accession E-MTAB-892), we generated a dataset giving a fist insight into transcriptomic response of the aquatic macrophyte Elodea nuttallii to Hg and Cd exposure. In the present study we aimed to extend this investigation to different Hg-species, dose-response effects and multiple stress exposure. We therefore investigated the transcriptomic response of Elodea nuttallii to Hg, methyl-Hg, Cu and ultraviolet-B (UV-B) exposure. We applied different concentrations of Hg and methyl-Hg in order to study dose-response effects. Combined exposures of Hg and UV-B were conducted in order to assess interaction effects of multiple factors. Plants were exposed up to 24 h, RNA was extracted using Tri reagent, libraries prepared according to Illumina standard protocols and sequencing was done on Illumina HiSeq 2000. After quality check, raw sequence reads were assembled into contigs. About 160 Mbp assembled sequence information were generated in this study.
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