HAO Jianchao1, LIU Huifen1, ZHOU Wei1, SHI Lijun1, LI Shaopeng1, LIAN Bin2
(1.Tianjin Agricultural University, Tianjin 300384, China;
2. Nanjing Normal University, Nanjing 210023, China)
Abstract: In order to provide theoretical guidance for controlling the eutrophication of ponds and reservoirs, the interaction between growth of Microcystis aeruginosa and adsorption and desorption of phosphorus on ferric oxide was studied in this paper. The ferric oxide was synthesized and characterized by SEM-EDS and XRD, adsorption and desorption behaviors of phosphorus on ferric oxide were correlated with the growth of M. aeruginosa. The results showed that the synthesized ferric oxide was similar to that found in natural soil and sediment; the adsorption of phosphorus on ferric oxide was a specific adsorption whose isotherm follows the Langmuir sorption model; adsorption of phosphorus on ferric oxide decreased concentrations of total phosphorus (TP) and water soluble phosphorus (SWP) in the culture, and such inhibited the growth of M. aeruginosa; M. aeruginosa could grow in the non-phosphorus BG11 culture （4.02<pH<10.05）with phosphorus contained ferric oxide; the growth of M. aeruginosa induced increasing of pH which favors desorption of phosphorus from ferric oxide; the transformation of Fe3+ to Fe2+ was inhibited by oxygen released by photosynthesis of algae. The above results indicated that the input of exogenous phosphorus, the release of phosphorus from iron minerals and the removal of algae must be controlled to avoid algal blooms in the eutrophic water body.
Key words: M. aeruginosa; ferric oxide; phosphorus; adsorption
EARTH AND ENVIRONMENT Vol.46, No.5, Tot No.325, 2018, Page 505
