Abstract
The removal efficiency of sediment phosphorus (P) in all fractions with in-situ adsorption-biological combined technology was studied in West Lake, Hangzhou, China. The removal amounts of sediment Ca-P, Fe/Al-P, IP, OP and TP by the combined effect of PCFM (Porous ceramic filter media) and V. spiralis was 61 mg/kg, 249 mg/kg, 318 mg/kg, 85 mg/kg and 416 mg/kg, respectively, and the corresponding removing rate reached 10.5%, 44.6%, 27.5%, 30.6% and 29.2%. This study suggested that the combination of PCFM and V. spiralis could achieve a synergetic sediment P removal because the removal rates of the combinations were higher than the sum of that of PCFM and macrophytes used separately. From analysis of sediment microbial community and predicted function, we found that the combined PCFM and V. spiralis enhanced the function of P metabolism by increasing specific genus that belong to phylum Firmicutes and Nitrospirae. Thus it can be seen the in-situ adsorption-biological combined technology could be further applied to treat internal P loading in eutrophic waters.
Highlights
Various remediation strategies have been developed to control internal P loading, such as precipitation of P by physicochemical methods[12,13,14], sediment dredging[15], in-situ physical adsorption methods and phytoremediation[16], etc
The key genera responsible for P metabolism was further predicted by PICRUSt (Phylogenetic Investigation of Communities by Reconstruction of Unobserved States) which was a newly developed software[25] and already applied for functional prediction in wheat straw degrading microbial consortia[26], streams with a gradient of alkaline mountaintop mine drainage[27] and changes of root-zone microbial community by plant invasions[28]
The sediment was siliceous, and total proportions of SiO2, Al2O3,CaO, Fe2O3 and K2O were more than 80%
Summary
Various remediation strategies have been developed to control internal P loading, such as precipitation of P by physicochemical methods[12,13,14], sediment dredging[15], in-situ physical adsorption methods and phytoremediation[16], etc. The key genera responsible for P metabolism was further predicted by PICRUSt (Phylogenetic Investigation of Communities by Reconstruction of Unobserved States) which was a newly developed software[25] and already applied for functional prediction in wheat straw degrading microbial consortia[26], streams with a gradient of alkaline mountaintop mine drainage[27] and changes of root-zone microbial community by plant invasions[28]. This is the first time to use PICRUSt in removal mechanism of sediment P in all fractions with the combined technology of PCFM and submerged macrophytes
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