Applid Experimental Research Of Coal Fly Ash-based Adsorbent

Forming coal fly ash-based adsorbent and homemade adsorption column was prepared for coal fly ash dynamic adsorption of the actual campus sewage to analyze whether the adsorbent in industrialized production and has extensive application prospect. Superfine fly ash was used as raw materials, reacted with a certain concentration of alkali solution under the certain conditions, superfine fly ash particles in the process of zeolite treatment of chemical reactions closely bonded together by extrusion molding device, named the forming of fly ash adsorbent. A certain amount of coal fly ash-based adsorbent was used for static adsorption experiment and combining the campus sewage water quality status with the experimental conditions, the experiment on the campus sewage test indicators identified as: chromaticity, pH, CODcr and ammonia nitrogen. Then the coal fly ash-based adsorbent was used to analyze the adsorbent packing height, velocity,adsorption initial concentration and pH on the absorption effect of the sewage. Breakthrough curve was made and the experimental data were dealt by Origin software to get the model of breakthrough curve equation.The results showed that :(1)The fly ash-based adsorbent has great removal effect on color and smell of sewage After processing the samples changed from yellow to pale yellow to colorless, and may have reached tasteless or only a light scent.(2)Using fly ash-based adsorbent adsorption column to treat the actual campus sewage including raw water and secondary effluent, when initial concentration of CODcr was 262.1 mg/L with varying filling height the time to penetration point increased with filling height increased, the concentration of CODcr and ammonia nitrogen at raw water can decreased from 262.1mg/L to 60~70mg/L, 32.37mg/L to 11mg/L respectively, removal effect is remarkable.(3)Fly ash-based adsorption column with CODcr concentration of 75.4 mg/L, ammonia nitrogen concentration of 18.23 mg/L life wastewater after biochemical treatment of secondary effluent, the effluent concentration reached 26 mg/L and 8 mg/L respectively,which is below the national discharge standards, the removal effect is great.(4)The breakthrough curves were plotted with experimental dataand fitted with the Origin software Logistic models, R2 were 0.95 to 0.99, indicating that fit the curve with Logistic modelhas high reliability, high correlation, regression formula accurate and reliable. The model can well describe the adsorption kinetics of coal fly ash-based adsorbents of CODcr and ammonia nitrogen.And we can take advantage of Logistic model to predict the dynamic adsorption capacity of coal fly ash-based adsorbent.(5)Applying ultrasound in stripping process can not only change the phase equilibrium condition but also can make the adsorption/stripping rate significantly fast. Therefore, ultrasound for regeneration of adsorbent, there are a few advantages. Firstly, it can accelerate the stripping rate and make the sorbent regenerational, secondly, it will effectively overcome the current widespread in industrial adsorbent regeneration which is not completely. Last but most important is it can low utilization efficiency of faults. Generally speaking,the removal effect is remarkable with the fly ash treatment. Through ultrasonic stripping molding saturated fly ash adsorbent regeneration, and analyzed the adsorption effect of fresh sorbent and regeneration of adsorbent. The existing questions of the fly ash are analyzed and constructive suggestions to the future of the studies are put forward.The development direction and theoretical basis of the fly ash-based adsorbent were provided for the exploitation and utilization. The paper has carried on the further forming of fly ash adsorbent applied amplification experiments and the forming of fly ash adsorbent in potential and application prospect of industrialization have further investigation.