Study On Effect Of SBBR Sewage System And Production Of Magnetic Biofilm Carrier

Nitrogen pollution has been concerned by people. In the 12th 5 year plan, total amount control will include the ammonia nitrogen, the provision to the urban sewage treatment puts forward new requirements. This research use biological carrier strengthening technology, combine aerobic denitrification bacteria and magnetic strengthening technology together, develop magnetic biological denitrification efficiency carrier. Using magnetic biological carrier and the SBR system, construct SBBR sewage system, investigate nitrogen and COD removal effect, use different environmental influencing factors of SBBR. Through PCR-DGGE system of microbial community structure succession law for existing wastewater treatment system, the strengthening of the aerobic denitrification and the application of nitrogen and synchronization mechanism provides further reference.Results show that 2 # carrier hang membrane effect, and can promote best growth and nitrate nitrogen removal efficiency of 0.91 and 94.17%, significantly better than pure bacteria. Of the three kinds magnetic strengthen treatment, P# and M+P# carrier promote removal efficiency of NO3-N the most advantageous, average removal rate increases to 99.06% and 98.44%, and promote the stability. M#, M+P# carrier increased value is 48.28 and 50.25 gO2·(gMLVSS·hr)-1. In the test different time T13 biofilm on the transformation of nitrogen, P# and found M# carrier grew more good, 4 h of nitrate nitrogen removal rate after that 95.79% and 96.38% of the water, and the nitrate nitrogen removal efficiency of also good. After 12h, total nitrogen removal to 91.63% and 92.46%. According to the results choose P# as the reactor dosing carrier.Dose the carrier in to SBR system and construct of the SBBR reactor system. In SBBR and control system two reactor operation period, SBBR average water ammonia nitrogen concentration of 2.91 mg/L, removal rate is 96.79%, and total nitrogen removal of water is 76.19%, COD evaluation is 49.25mg/L. Control system average water ammonia nitrogen concentration 7.23mg/L, removal rate 92.08%, total nitrogen removal rate of 59.84% on average. Average COD 55.93 mg/L water concentration, SBBR of TN and COD removal efficiency and stability are superior to that of the control system.The best HRT for SBBR system is 24 hours, contrast system is 28 hours. SBBR system got appropriate effect in the pH range of 7 to 9 total nitrogen and COD removal, and control system in the pH range of 7 to 8 can obtain corresponding best effect. As DO concentration, two sets of system increased total nitrogen removal rate drop, SBBR and control system got best effect when DO concentration is 2.0mg/L. DGGE analysis showed that, SBBR system and control system has the rich diversity, T13 in operation process of the operation and the magnetic strengthen carrier has been in.