Removal Mechanism of Nitrogen and Phosphorus from Landfill Leachate by High Water Content Cyanobacteria Pulp
Landfill leachate and cyanobacterial bloom will have a serious impact on the ecological environment,and this study mixed the high-moisture content cyanobacterial slurry and landfill leachate directly salvaged from Taihu Lake in different proportions to explore a path to control leachate pollution with cyanobacterial waste.The results showed that when the proportion of landfill leachate exceeded 30%,it would lead to the fragmentation and extinction of the Microcystis colony.On the first day of the experiment,the nitrogen and phosphorus contents of a single extracellular polysaccharide were 1.63 pg/cell and 0.523 pg/cell,respectively,which were 32.5%and 12.0%higher than those in the control group,and the nitrogen and phosphorus content in a single cell was 5.22 pg/cell and 0.389 pg/cell,respectively,which was not significantly different from the control group.There are two mechanisms for Microcystis to remove landfill leachate,namely rapid adsorption of exopolysaccharides and slow intracellular absorption.However,after being in the landfill leachate for a long time,the Microcystis colony will gradually dissolve and release a large amount of nitrogen and phosphorus,so the rapid adsorption mechanism of the Microcystis colony can only be used to remove the nitrogen and phosphorus in the landfill leachate,and when a large number of Microcystis still retain the colony morphology and floating ability,they can be quickly separated from the landfill leachate.Future research needs to consider how to reduce the toxicity of landfill leachate,so that Microcystis can simultaneously play the function of intracellular absorption of nitrogen and phosphorus,so as to purify landfill leachate more efficiently.
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