Notice of RetractionEffect of Different Carbon Resource on Enrichment of Polyphosphate Accumulating Organisms in Sediments from Lake Taihu

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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In order to investigate the effect of different carbon resource on enrichment of polyphosphate accumulating organisms (PAO) from sediment samples as well as the effect of PAO on the cycle of phosphorus in lake sediments, sedimentary samples in Lake Taihu were taken and enriched through using four kinds of carbon sources (glucose, cellulose, sodium acetate and propionate) in laboratory-scale sequencing batch reactors (SBRs). The COD/P ratio in the feeding was 15:1. The cycle time was 24 h and consisted of feeding, anaerobic period, aerobic period settle/decant period. The hydraulic retention time was 48 h, and the solids retention time was controlled at approximately 20 days. The dissolved oxygen concentration in aerobic period was maintained at 2-3 mg/L using an pump, where air was supplied at a flow rate of about 1 L/min. The reactor was operated at 25°C with an initial pH of 7.5 ± 0.1. The results showed that the orthophosphate concentration increased at the anaerobic phase in four reactors more or less, and decreased at the aerobic phase, which confirmed that there existed polyphosphate accumulating organisms in sediments of Lake Taihu. While phosphorus release rate using propionate as single carbon resource was the highest, acetate and propionate as substrate were benefit for accumulation of PAO.