Preparation Of Ca²⁺, MnOOH/red Mud Filter Material And Its Removal Of Iron And Manganese From Water

With the rapid development of the economy,the groundwater damaged by different degrees,and the problems of Fe²⁺and Mn²⁺are very common.Long-term drinking groundwater with excess Fe²⁺and Mn²⁺can cause osteoporosis,parkinson's disease and damage to the central nervous system of the human body,and cause damage to organs.Excessive amounts of Fe²⁺and Mn²⁺also have a varying degree of impact on industry and life.Most of the methods for treating Fe²⁺and Mn²⁺are to add chemicals in a water treatment plant or to use bio-filters.Although the effect and the amount are very considerable,it is necessary to find effective filtration for the terminal treatment of drinking water.In this paper,red mud is used as the main raw material,in order to enhance the performance of the filter medium.The pulverized coal and bentonite are mixed in a certain proportion to add polyvinyl alcohol.The red mud particle filter is manually prepared,and the red mud particle filter material is placed in a muffle furnace and calcined at 1030°C for 40min to obtain red mud particle filter.However,the experiment shows that the treatment of Fe²⁺and Mn²⁺by the original red mud particle filter media can not directly make the effluent meet the drinking water standard promulgated in 2006.In this paper,it is proposed to use Ca²⁺and?-MnOOH double-loaded red mud particle filter material to treat trace exceeding amounts of Fe²⁺and Mn²⁺in water.The original red mud particle filter and Ca²⁺-?-MnOOH double-loaded red mud particle filter were used to treat the simulated polluted water containing Fe²⁺and Mn²⁺.The three affected control factors tested.XRD,TG-DTA,Zeta potential,BET and SEM were used to characterize the performance of the prepared samples.The specific surface area of the modified red mud particle filter material increased from 2.252m²g^-11 to14.070m²g^-1.The average pore size decreased from 26.218nm to 9.624nm.The experimental results show that the removal ability of Ca²⁺-?-MnOOH double loaded red mud filter media for Fe²⁺and Mn²⁺is stronger than that of the original red mud particle filter media,and the influencing factor of pH is the most important factor for the removal of Fe²⁺and Mn²⁺.In the experiment,the removal efficiency of Fe²⁺and Mn²⁺increased with the increase of adsorption time,and reached the adsorption equilibrium at 3h,and the effluent concentration of Fe²⁺and Mn²⁺was lower than that of 0.3mg/L and 0.1 mg/L.With the increase of the dosage,the removal effect of Fe²⁺and Mn²⁺is better,and the adsorption of the two pollutants is not much when the dosage is 0.2g,so2g/L is selected as the best amount of adsorbents in this experiment.The desorption of adsorbents has always been a difficult problem.In this experiment,the adsorbents after saturated adsorption of Fe²⁺and Mn²⁺were proposed to treat the trace amount of F^-which exceeded the standard in water.The removal efficiency of F^-in 10mg/L by saturated adsorbents treated with Fe²⁺and Mn²⁺wastewater can reach the standard of F^-content in reference water less than 1 mg/L.The results show that Ca²⁺-?-MnOOH double loaded red mud particle filter media is a promising absorbent for water treatment.