Purification effect and adsorption characteristics of main pollutants in initial rain runoff by ZnFe2O4 modified desilting sludge permeable brick
In order to effectively utilize the desilting sludge from water body and solve the pollution problem of initial rain runoff simultaneously,the ZnFe2O4 was synthesized to modify desilting sludge permeable brick.The surface morphology,elemental composition and crystal structure of prepared desilting sludge permeable bricks were analyzed by SEM,EDS and XRD.The appropriate ZnFe2O4 mixing ratio permeable brick was screened through the ZnFe2O4 mixing ratio test,and the inital rain purification experiments and adsorption of the prepared desilting sludge permeable bricks were carried out.The experimental results showed that:1)the ZnFe2O4 modification greatly improved the theoretical maximum adsorption capacity of desilting sludge permeable bricks for suspended solids and phosphate.2)Before and after modification,the adsorption of phosphate by desilting sludge permeable bricks tended to be mono-molecular adsorption,and it was a spontaneous endothermic process.3)The adsorption process of unmodified desilting sludge permeable bricks to suspended solids was consistent with multi-molecular layer adsorption,while ZnFe2O4 modified desilting sludge permeable bricks were more consistent with mono-molecular adsorption.4)ZnFe2O4 modified desilting sludge permeable brick had the better adsorption performance and purification effect on suspended solids and phosphate than those of unmodified desilting sludge permeable bricks,and could be recommended as a suitable permeable material for use in sponge cities.
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