Notice of RetractionThe Contribution of Leaching under Different pH to Nutrients Release of Cattail Litter

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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The anaerobic decomposition of aquatic plants could serve the dual roles for producing renewable energy and reducing waste. In this study, a laboratory experiment was carried out using cattail (a lignocellulosic aquatic plant) as substrate to explore the contribution of leaching to its nutrients release under 25°C and different pH conditions. Results showed that the nutrients release was significantly influenced by pH values. Alkaline conditions favored the dissolution of SCOD, HS and protein while reducing sugar was much easier to release under acidic solution. On 25^th day, about 9%, 11% and 37% of COD was converted from the solid phase to the liquid phase at pH 6, 9 and 12, respectively. It was the complex structure of lignocellulose that made it need strong alkaline condition and more time to decompose. VFAs production increased with pH value, and achieved maximum 88mg / L under the condition of pH 12 and the retention time 25d. The concentration of VFAs accounted a tiny part in total organic carbon of leaching liquor probably because of the lack of enzymatic reaction of microorganism.