Surface Modification Of Fly Ash And The Study On Removal Of Ammonia Nitrogen In Water

There is nearly a hundred million tons of fly ash discharged in China every year.These fly ash takes up a lot of land for agricultural,and dose a great harm for the wnvironment as well.By utilizing its adsorption capability,the effective of waste water treatment is studied.By the way,the fly ash is low cost and can be obtained conveniently.Through to pulverized coal ash inorganic modified processing, the acid, the alkali, salty modified processing can enhance the pulverized coal ash the cation exchange quantity, but comparatively speaking, under the alkalinity condition obtains the modified pulverized coal ash has the strong cation exchange capacity. According to the modified pulverized coal ash adsorption ammonia nitrogen's static state and the dynamic testing, the relationship between definite time, the temperature, pH, throws the increment, the organic matter density, the ammonia nitrogen initial density and the adsorptive capacity of ammonia nitrogen of modified coal ash is found. The actual water sample and the regeneration pulverized coal ash to actual water sample's processing, inspected the modified pulverized coal ash to apply in the project actual feasibility as well as pulverized coal ash circulation use ability.The result indicated: modified coal ash has a good adsorptive capacity to the ammonia nitrogen. Its adsorptive capacity increases with the increasing of time and increment throws; weak acid and the low temperature environment is advantageous to the modified coal ash adsorption; The orthogonal experiment indicated that various factors to the influence order of coal ash adsorption ammonia nitrogen are in turn: Throws the increment > the ammonia nitrogen initial density of ammonia nitrogen >pH> time; The low speed of flow condition is advantageous to the adsorption of modified pulverized coal ash; The modified pulverized coal ash has the high elimination rate to the low concentration ammonia nitrogen waste water; The modified coal ash has the good processing effect to the actual water sample.