Study On The Removalof Carbon And Denitrification Of SND Bythe Efficient Reactor Of Double Aerationand Double Sludge-layer Filtering

The sewage discharged by small towns, schools, hospitals, factories on remote areas andrural areas, is small and relatively dispersed. It will greatly increase the scale of constructionof pipeline and the economic cost to carry out large-scale processing together. But the harm ofthese massive organic matter and nitrogen in the sewage can not be ignored. Therefore, thesewage treatment process that can treat the decentralized wastewater, has good carbon andnitrogen removal effect, energy saving and high efficiency, and can be widely applied hasbecome the urgent needs of people.This topic is supported by the education research project of the Department of ShandongProvincial that experimental study on the reactor of high efficiency of aerobic granularsludge-mud filtration (12-1-4-4-(5)-jch). and the project of Science and Technology ofQingdao Municipal that small town sewage-double aeration double sludge backflow doublesludge filtration process (J09LB14). Developed high efficiency reactor with double aerobicaeration and bidirectional return sludge and double sludge filtration area (invention patent,patent number: ZL201010573254.4), the reactor has two aeration zone with different loadand two high concentration sludge filtering area.This experiment use this reactor treating the domestic sewage, study on quick start of thereactor with high inoculation sludge and routine load; the removal of carbon anddenitrification of SND and the mechanism of nitrogen removal of SND under conceptualcontrol (because of water sewage has fluctuation, it is difficult to control the reactor in aparticular volume load, and can only be conceptual control, that is to control the actualvolume load as far as possible in the required volume load value, the actual control values inthe range as small as possible fluctuation) of the three load levels1.3kgCOD/(m3·d),1.8kgCOD/(m3·d),2.3kgCOD/(m3·d); the COD and ammonia nitrogen and total nitrogenremoval ability respectively of the reactor and the two section of biochemical reaction systemof the reactor; sludge reduction effectiveness. The test lasted122days, the results are asfollows:(1)Put the amount of sludge as normal operation required into the reactor as inoculation,and conceptual control1.3kgCOD/(m3·d) volume load level to start. The third day, the effluentCOD achieved the standard which realized the quick start with high sludge and routinevolume load;(2)The reactor under the1.3kgCOD/(m3·d),1.8kgCOD/(m3·d),2.3kgCOD/(m3·d) three different concept control volume loading level conditions:1) The reactor effluent COD caneventually stabilized below50mg/L, achieved standard of modification of the "Shandongprovince Peninsula river basin water pollutant comprehensive discharge standard"(DB37/676-2007).The effluent COD average removal rate was:91%,90%and90%; theaverage COD removal rate of the corresponding first biochemical reaction zone was:80%,78%and77%.2) By adjusting the DO range, three different volume loading level allachieved the SND nitrogen removal process, the corresponding DO respectively of firstaerated zone was:0.7-1.1mg/L,1.1-1.5mg/L and1.5-1.9mg/L, corresponding the second DOaeration zone was about0.5mg/L;3) When realized SND, the concentration of ammonianitrogen in effluent was below5mg/L, the effluent can reach the standard, the respectivelyaverage removal rate of ammonia was96%,96%and96%; the ammonia nitrogen inbiochemical reaction zone of the first section removal rate was93%,88%and87%;4)Whenrealized SND, the effluent total nitrogen respectively average removal rate was92%,90%and90%; corresponding to the first biochemical reaction zone total nitrogen removal rate was85%,82%and80%.(3)The reactor has good sludge reduction performance, the sludge reduction rate wasover88%.