Study Of The Cross-linked Rectorite For NH₄～+,PO₄～(3-) And The Application Of Landscape Water

This thesis with the mingliu company provides of rectorite for raw material, make use of the laboratory self-made hydroxy-aluminum to form cross-linked rectorite, currently aiming at the high expenses and the slower effects of landscape water. The thesis systemly studies of its adsorption behavior for NH₄⁺, PO₄^3-, and discussed interrelated mechanisms, its applications firstly carried out into actual landscape water.The main results are studies as follows:(1) The cross-linked rectorite are studied and the results indicates: mineral concentration,the temperature,the compare of hydroxy-aluminum and mineral,the time of mix round are the four main factors to infect the reaction. the better condition from the experimentation of 4 factors is 4% mineral concentration,normal temperature, 10mmol.g^-1 the compare of hydroxy-aluminum and mineral, 2 h the time of mix round.(2) The adsorption behavior is studied for NH₄⁺, PO₄^3- and also discuss interrelated mechanisms. The results indicate: the cross-linked rectorites have good adsorption for NH₄⁺ in wastewater, especially for low concentration(≤100mg/L),the result still very good by using polyvinylalcohol(PVA)cross-linked with boric acid. The result of experiment shows that the process of the adsorption by the cross-linked rectorite and the immobilized cross-linked rectorite is fitted to Langmuir adsorption isotherm. The maximum of PO₄^3- adsorptions by the rectorite,the immobilized rectorite,the cross-linked rectorite,the immobilized rectorite are 9.67mg/g, 8.24mg/2g,17.67mg/g,13.13mg/2g,the adsorptions are augmented by using cross link. The results show by testing the cross-linked rectorite by means of XRD instrument that the cause of adsorption for NH₄⁺ is the ion-exchange and the cause for PO₄^3- is the area of the interplanar space.(3)The first step studies to repair the landscape water by the cross-linked rectorite, the results show: the donghu water can be discharged up to A water quality of 《water quality standard for scenery and recreation area》 when be treated with the cross-linked rectorite in captive test. The burden of water power is a main factor to affect the experiment. The cumulate water is 532ml when SV= 10h^-1 and 805ml when SV = 5h^-1,which are discharged up to C water quality. Therefore, the time of adsorbable pole can be prolonged and the cumulate water is improved when lowering the burden of water power.