Experimental Study On Composite Porous Material Treating Methylamine Manufacturing Wastewater

Currently, there are many reports about modified zeolite treating ammonia-nitrogen wastewater, aiming at the problems of alternative modification methods and modifiers limited, and finite study in dynamic aspects, my research ideas were as follows:firstly, explored the methods of preparing composite porous materials, such as looking for suitable binders and determining the ratio; secondly, tested respectively the adsorption effects of composite porous materials by static and dynamic methods. Tested the factors by static method such as initial concentration, dosage, contact time and so on, and tested factors by dynamic methods including initial concentration, velocity and so on. The results were as follows:(1) By screening, decided to use attapulgite clay that can withstand certain temperature as the binder;(2) Optimum conditions to prepare composite porous materials were: m(zolite):m(attapulgite clay):m(activated carbon):m(fly ash)=100:8:20:20, sintering temperature 400℃, time 1 hour, called prescription 1;Static tests found that, with the increase of initial concentration ammonia-nitrogen, the amount of unite mass composite porous material adsorbing ammonia-nitrogen gradually increased, but when initial concentration were 0.8C and C, its adsorption were close; with the increase of dosage, the amount of unite mass composite porous material adsorbing ammonia-nitrogen gradually increased, but the amplitude became smaller; before 40min, extending time caused the amount of unite mass porous material adsorbing ammonia-nitrogen to increase, and after 40min, the curve flattened; appropriate increase in temperature was beneficial to composite porous material adsorbing ammonia-nitrogen.The results of dynamic tests showed that, velocity comparison between 3L/h,6 L/h,0.2 L/h,0.4 L/h, at low velocity conditions, having longer contact time with wastewater, so the treatment effect of porous materials was better; initial concentration comparison between 0.8C and C, the treatment effect was better at former conditions, and the amount of unite mass porous material adsorbing ammonia-nitrogen was bigger, so not concentration was higher, the amount of adsorbing ammonia-nitrogen was greater; comparison between burned composite porous material at 400℃and 500℃ condition, the treatment effect of the former was better than the latter, but after 1 OOmin, the effect became stable; the difference between activated carbon and coal as porous-forming agent was that before 120min, the treatment effect of the former was better than the latter; composite porous material dosage comparison between m and m/2, the treatment effect of the former was better than the latter, but after 60min, the effect became stable.(3) Another optimum conditions to prepare composite porous materials are: m(zolite):m(attapulgite clay):m(Al(OH)3)=100:10:16, sintering temperature 400℃, time 1.5 hours, called prescription 2;The results of dynamic tests are:initial concentration comparison between 0.5C and C, the treatment effect of the latter was significantly better than the former, and the conclusion was contrary to that of prescription 1; velocity comparison between 0.2 L/h and 0.4 L/h, the treatment effect of the former was better than the latter, the conclusion is similar to that of prescription 1; composite porous materials preparing by 170 mesh and 80 mesh zeolite comparison, the treatment effect of the former was better than the latter; composite porous materials burned at 400℃and 500℃condition, their treatment effects were similar, so temperature had little effect on the treatment effect.