The Preparation Of PVA Embedding Zr-AC Adsorbent And Research Of Phosphorus Removal Effect On The Landscape Waters

Along with the development of human society, the human behaviour havefurther influence on the water environment, which leads to the water pollution problemmore extrusivly.The landscape water is closely related to the human life,the problem ofits eutrophication is becoming the focus of the research at present.The research showsthat:the main reason causing the eutrophication is that Nitrogen content and Phosphoruscontent in the water are highly more, when phosphorus content is more than20mg/l,theratio of N and P is16:1,it is thought that the eutrophication has happened. This subjectmainly aims at the eutrophication problem of the landscape water,combines the dippingmethod with the embedding method, and prepares a new type of embedding adsorbent.The new type of embedding adsorbent use the adsorptivity of the metal elements oxidein the transition zone, adsorb the root of phosphoric acid in the water,then reduce thephosphorus content in the water, break the proportion of N and P, restrain theeutrophication.The research shows that:the OH-on the surface of hydration zirconia happen theion exchange with PO₄^3-in the solution, and generate the complex, then achieve thepurpose of adsorbing and removing phosphorus.This subject based on this theory,selects active carbon as the carrier, PVA （polyving akohol） as the embeddingmedium,H3BO3as cross-linking agent,CaCl2and sodium alginate as the sodiumalginate, load and embed hydration zirconia, the new type of embedding adsorbent withadsorbing efficiently and using renewably was prepared. The experiment determinedthe optimum loading, embedding, removing phosphorus conditions of the new type ofembedding adsorbent, explored adsorbed mechanism and regenerated conditions, andcarried out the test of phosphorus removal effect on landscape water on the actual park.The optimum conditions of activated charcoal loading zirconia is determinedthrough the orthogonal experiments that: the dipping liquid concentration is0.04mol/l,the size of AC particle is1.0².0mm, the dipping time is12h, under the temperature120℃, the adsorbing performance of the loaded adsorbent is the optimum, Phosphorusremoval efficiency is95.60%，adsorbing capacity is11.34mg/g. the loaded adsorbent is cured by the emberred method, the optimum embedding condition determined is that:the mass concentration of PVA is8.0%, the mass concentration of sodium alginateas is1.2%, the mass concentration of the loaded adsorbent is7.5%, the temperature ofembedding fluid is45℃, the mass concentration of H₃BO₃is4.5%, the massconcentration of CaCl₂is2.0%, the embedding adsorbent after curing in20h has thewell Strength, swelling sex, mass transfer sex and crosslinking sex,its phosphorusremoval efficiency is95.27%, adsorption capacity is9.48mg/g.The new type ofembedding adsorbent with2.0g are joined in100ml water, its initial concentration for50mg/l, pH is5⁶,the temperature is30℃,the adsorbing time is72h,the phosphorusremoval efficiency is95.43%, the Phosphorus removal effect of the new type ofembedding adsorbent is best under the envirnment.For characterizing the adsorbing mechanism of the new embedding adsorbent,the experiment analyzes the adsorbing rate curve and adsorption balance law, theanalysis results show that:the adsorbing process of the embedding absorbentadsorption corresponds Level1dynamic model,can be described by the level1reaction kinetics equation-Class eritrea’s formula,the fitting correlation of the formulais R²=0.9941,the fitted equation is q=9.48(1-exp0.004t^1.5889); while the embeddingabsorbent adsorbs to the balance extent,its sothermal process fits the Freundlichisothermal type,its equation is q_e=7.1945c_e1/6.5617, the fitting correlation of the formulais R²=0.9265.In the actual landscape water treatment,the composition of thelandscape water were determined through the ion chromatographic analysis method,The experimental results show that:the main ion of landscape water includeF-,PO43-,Br-,NO2-,NO3-, the ion adsorbing ability order of the embedding adsorbents isPO₄^3-﹥﹥NO₃^-＞NO₂^-＞F，there is no adsorbing efficiency for Br-.In addition,the experiment measures the renewable performance of theembedding adsorbent, the desorption liquid is NaOH liquid,its concentration is2mol/l,the desorbing time is2h, the embedding adsorbent can be completely taked off basicly,the desorbing efficiency is99.43%,the activity ratio is98.37%.When the embeddingadsorbent is desorbed and regenerated after eight times, the desorbed efficiency ofembedding adsorbent is96.43%, the activity ratio is92.22%,the adsorbingphosphorus removal efficiency of the embedding adsorbent is87.86%, the adsorbingcapacity is8.75mg/g.The desorbed and regenered process increase the strength of theembedding adsorbent,and reduce swelling sex and crosslinking sex,improve theuntility value. According to the optimum experiment of the loaded, embedding, phosphorusremoval condition of the new embedding adsorbent, the adsorbing mechanism and thelaw of adsorbing equilibrium were characterizated by the ion chromatographicanalysis method and so on,thus prepared the new type of embedding phosphorusremoval adsorbent with highly efficiency, and applied in practical water treatmentprocess, the experimental results show that the adsorbent has highly efficiency onphosphorus adsorption performance and renewable performance.