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Activated sludge metagenome

ABSTRACT: Metabolic potential of superphylum Patescibacteria reconstructed from activated sludge samples in a municipal wastewater treatment plant

PROVIDER: PRJDB13037 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	DRR348033_1.fastq.gz	Fastqsanger.gz
	DRR348033_2.fastq.gz	Fastqsanger.gz
	DRR348034_1.fastq.gz	Fastqsanger.gz
	DRR348034_2.fastq.gz	Fastqsanger.gz

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Project description:Manufactured nanomaterials (MNMs) are increasingly incorporated into consumer products that are disposed into sewage. In wastewater treatment, MNMs adsorb to activated sludge biomass where they may impact biological wastewater treatment performance, including nutrient removal. Here, we studied MNM effects on bacterial polyhydroxyalkanoate (PHA), specifically polyhydroxybutyrate (PHB), biosynthesis because of its importance to enhanced biological phosphorus (P) removal (EBPR). Activated sludge was sampled from an anoxic selector of a municipal wastewater treatment plant (WWTP), and PHB-containing bacteria were concentrated by density gradient centrifugation. After starvation to decrease intracellular PHB stores, bacteria were nutritionally augmented to promote PHB biosynthesis while being exposed to either MNMs (TiO2 or Ag) or to Ag salts (each at a concentration of 5 mg L-1). Cellular PHB concentration and PhyloChip community composition were analyzed. The final bacterial community composition differed from activated sludge, demonstrating that laboratory enrichment was selective. Still, PHB was synthesized to near-activated sludge levels. Ag salts altered final bacterial communities, although MNMs did not. PHB biosynthesis was diminished with Ag (salt or MNMs), indicating the potential for Ag-MNMs to physiologically impact EBPR through the effects of dissolved Ag ions on PHB producers.

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Project description:The performance of a lab-scale wastewater treatment plant during the start-up phase was investigated. A period of varying pH resulted in the loss of ammonium removal efficiency together with a decrease in the specific autotrophic oxygen uptake rate (OUR). From the OUR, it was inferred that the ammonium oxidizing bacteria (AOB) were inhibited by the fluctuation in the pH values. However, OUR alone could not provide the information as to how the AOB were affected at the molecular level. To gain a better insight, shotgun proteomic method was used in this work to quantify the total proteins in the system. Label-free quantification (LFQ) showed that during the time of poor ammonium removal, the marker enzyme hydroxylamine oxidase found in Nitrosomonas sp. was at the lowest LFQ intensity. Based on these results, proteomics has the potential to be used as a monitoring tool. Nevertheless, there are still some restrictions when measuring activated sludge using proteomic method such as the availability of a suitable proteomic database. In this paper, we describe our experience of using publicly available database for identification of activated sludge proteins.

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