Study On Magnesium Slag, Red Mud Utilization Of Ceramic Filter Ball To Remove As From Wastewater

With the rapid development of the social economy and technology,the pollution ofarsenic unknown in the past is increasingly serious in the water source.Recently, because the arsenic compounds are lethal toxicants and widely—used in the agriculture and industry,environmental scientists around the world have paidattention to the problems brought out by arsenic compounds that contaminates theenvironment, especially in the water sources. Therefore, it makes importantse. nse to develop a thorough, simple and economical method to remove the arsenicfrom the wastewater or drinking water source at present.The article uses ceramic filter material made of magnesium slag and red mud as adsorption, which is magnesium slag ceramic filter (MPB) and red mud and ecological ceramic filter (RPB)that can be put into reuse and recycle. Its utilization of TiO2 load in the ceramic filter on the ball is modified, which is magnesium slag ball loaded TiO2 and red mud and ecological ceramic magnesium slag ball loaded TiO2. And the passage also includes the research and mechanism of the removal of Arsenic. Through the research of the topic, we reach these conclusions.(1) the experiment research on the regulation of MPB-Ti's removal of As(V), and research shows that the best absorptive condition of concentration of 2mg/L is pH=2,240min time, filter ball dosing quantity 20g/L. The arsenic removal can reach 95.96%. Through orthogonal test L9 (34), we find the optimum technological conditions to remove As(V) is temperature for 323K, time for 6h, dosing quantity for 6g and pH for 2. And the effect of MPB-Ti's ions adsorption of As(V) is above 99%.(2) MPB-Ti's adsorption kinetics for As(V) fit with secondary adsorption dynamics model. And in different concentrations and under the influence of different temperature, we reach its adsorption and absorption rate constant, the half time of adsorption equilibrium adsorption, and activation energy for 10.517 kJ/mol. The research on thermodynamics of MPB-Ti's adsorption for As(V), and find that it's easy to describe MPB-Ti's adsorption for As(V) by Freundlich equation. We reach its adsorption entropy (?)S=16.48J/(k-mol) and adsorption enthalpy (?)H=36.609kJ·mol.(?)G is less than zero which illustrates absorption is a spontaneous process.(3) Comparative study on the regulation of MPB-Ti's adsorption for As(Ⅲ) of four adsorption materials ranging from pH=3 to pH=11 shows that the adsorption ability of MPB-Ti is superior to other adsorption materials. Research shows that MPB-Ti's adsorption for As(Ⅲ) reaches its peak in neutral and weakly alkaline conditions.(4)Through L16 (45) orthogonal experiment, we find that it influence most by the types of adsorption through the removal of As(Ⅲ).And the MPB-Ti's function is the best. When alpha take 0.1 and adsorption materials F=2.838> F0.1(3,15)=2.49 by adsorption materials, it shows significant difference at performance among the adsorption materials. L9 (34) orthogonal experiment shows that the best condition of MPB-Ti's adsorption for As(Ⅲ) is temperature, time, dosing quantity, pH for 313K, 3h,4g,8. The effect of MPB-Ti's adsorption for As(Ⅲ) can reach above 85%.(5) We do research on photo catalytic oxidation synchronic adsorption When pH=2, dosing quantity is 4g, adsorption time is 4h and find that the removal rate can add to 11%.