The Denitrification Technology Research On Simultaneous Nitrification And Denitrification In Sequencing Batch Reactor (SBR)

The standard of nitrogen removal in wastewater discharge was controlled more and more strictly with severe water pollution and eutrophication question occurred and the sense of environmental protection enhanced. The wastewater techniques developed gradually from the period of pure COD removal to the period of simultaneous COD and nitrogen removal.The experiment about SND was carried out operated with artificial municipal wastewater by sequencing batch reacter (SBR). Some factors that effect SND were studied particularly.The mechanism of SND was studied too. Simultaneously the best operation mode with SND was figured out in the lab.The results show that the efficiency of SND by sludge can be enhanced cultured for one month in SBR. The best operation mode is to controll DO about 0.5~1.5mg/L, SRT about 17~25d, MLSS about 5000mg/L, the mixture of beer and starchy is used as carbon source of SND and pH about 7.5~8.0. Under the best operation mode, the artificial municipal wastewater with about 22.1~28.6mg/L of NH4+-N, about 30.0mg/L of TN, about 200mg/L of COD was treated by operating aerobic process for 5h, with COD, NH4+-N, NO3--N and NO2--N of 20.0mg/L,0.5mg/L,5.0mg/L and 0.3mg/L below in the effluent, the removal rate of COD is 90% above , the removal rate of TN is 81%~94% .The experiment also studied the character of SND by sludge and the variation of DO,ORP and pH. By analyzing the reaction process of SND, the main mechanism of SND in the experiment is the theory of microenvironment and biology.