Preliminary Study on Influencing Factors of Wastewater Purification by Microbial Nano-Silica Ball

EM enrichment culture liquid was immobilized on nano-silica carrier consisting of pond sediment, zeolite powder and nano-silica to form microbial nano-silica ball. Influencing factors of initial ammonia nitrogen (NH4+-N), COD, pH and dissolved oxygen (DO) concentrations on wastewater purification by microbial nano-silica ball were studied. The results showed that removal rate of NH4+-N, total nitrogen (TN) and total phosphorus (TP) was the highest with COD concentration of 500mg/L when initial COD was ranged from 250 to 2000mg/L. On the condition of initial NH4+-N concentration ranged from 50 to 500mg/L, removal amount of NH4+-N and TN in wastewater reached the maximum when NH4+-N concentration was 400mg/L. On the condition that pH was ranged from6 to 9, removal effect of pollutants was the best when pH was 8. The results also showed that NH4+-N and TN removal rates in wastewater could be increased by appropriate aeration. But aeration had no effect on TP removal rate in wastewater.