The Macroporous Polyurethane Carrier Used For Immobilization Microorganism And Its Application For Sewage Treatment Research

This paper was divided into two parts to immobilized microorganism technology of macroporous polyurethane carrier as the core. In the first part, the treatment of actual potato processing wastewater was studied using combined process of anaerobic-aerobic biological filter. The start-up, influence factors of the anaerobic reactor, acidification recovery process, recovery measures after anaerobic microorganisms chloroform poisoning, as well as stable operation of combined anaerobic-aerobic biological filter process were studied; In the second part, a combination of traditional A/O process and biofilm technology was used to the denitrification, decarburization, and phosphorus removal of artificial sewage wastewater. It was investigated that influence factors such as ammonia nitrogen load, hydraulic load on the artificial urban sewage. In addition, chemical phosphorus removal methods which made the final effluent total phosphorus reach the standard were also studied. The experimental results are as follows:Anaerobic reactor used actual potato processing water to start. Influent COD was gradually increased from740mg/L to10,000mg/L, influent pH was controlled between7.6and8.7, and HRT for9.6h, under these conditions, one month was spent to complete a quick startup of the reactor. Through the operation conditions in the process of impact test, the results showed that the optimal influent HRT was9.6h. Under good operation conditions, COD removal efficiency increased gradually with the increase in height of the reactor. The reactor was on normal operation in the temperature range of25℃-35℃, and COD removal rate did not appear particularly significant decline. When influent pH drops to4, the reactor appeared serious acidification. After completely acidification, the reactor successfully realized second start-up lasting two months and through three stages of acidification recovery. After20d stable operation, the various indicators of the system was relatively stable, and there is a good re-achieve balance.Combining process of anaerobic-aerobic biological filter to treat influent about5000mg/LCOD was studied. The result showed that final effluent COD maintained at100mg/L and the average COD removal efficiency of the system was98.5%.In the second part, the system showed good denitrification and decarburizatfon effect. Influent ammonia load of the system could stand as high as120.91g/m3·d, the optimal HRT was12h. For treatment low C/TN (2-6.7)wastewater, the average of TN and ammonia nitrogen removal rate were79.6%and91.5%, respectively, and COD removal rate was between80%and90%; the impact of mixture return ratio on TN and ammonia nitrogen removal rate was light. Stable operation of a week showed that the effluent ammonia and TN concentrations were0.47mg/L and13mg/L, respectively. At the same time, the average of ammonia nitrogen, TN and COD removal efficiency were99.39%,83.18%and88.5%, respectively. The results of chemical phosphorus removal studies showed that the optimal combination of flocculating agents are40mg/L FeCl3and70mg/L PAC, optimum stirring speed15min, settling time60min, under these conditions, the effluent TP is less than lmg/L.