Denitrifying Phosphorus Removal In Two-sludge Baffled Reactor

From the angle of biological phosporus removal,Phosphorus bacteria can takes the oxygenous molecule for the electronic accepter and NO3--N is took for the electronic accepter. However, Nitrogen removal and phosporus removal are syncretized in the anoxic process of phosporus removal, and from the angle of that energy which is consumed, phosporus removal in anoxic condition is a metabolic mode that can retrench energy sources. So far Large numbers of date home and abroad indicated that the research on the two-sludge denitrifying phosphorus removal process has been in SBR of Sub-building-type , the integrate process is uncommon.Hydraulic flow pattern in Baffled Reactor has a characteristics that single compartment is nearly completely mixed, the overall compartments are nearly plug-flow .In addition that Baffled Reactor also has advantages.that simple structure, low investment, running stability, shock load capability, high efficiency treatment and so on. Therefore this study used two different sets of two-sludge baffled reactor, and the aerobic zone of the devices choose different filler - a flexible and stereoscopic bio-carrier and suspended bio-carrier(the reactor of No latter aerobic time and with flexible stereoscopic bio-carrier is 1#, the reactor of increasing latter aerobic time and with suspended bio-carrier is 2#) to operate performance studies, the major study results are as follows:(1) after a certain period of cultivation and domesticated, controling operating condi- tions, the two-sludge baffled are able to receive better performance of Denitrifying Phosphorus Removal and system runs stability.(2) In the period of starting reactor, the study with Express sludge on the effective- eness and impact of biofilm factors was tested. Influent organic concentration, HRT, filler characteristics and other factors have the important impact on the filler star-up.The best conditions are that DO is enough, room temperature is 18℃~ 22℃, influent CODcr concentration is 120mg / L, C / N is 5, HRT is 6h, Suspended bio-carrier is better than a flexible stereoscopic bio-carrier, NH4+-N removal rate reached 86%, CODcr effluent concentration is below 70 mg / L.(3) The first factor to make the system of denitrifying phosphorus removal oprerate steadily is water quality conditions. It is found that CODCr /TP is 50, TN/TP is 9, Influent CODCr concentration is 250 mg / L is the best . Under these conditions, the system can be higher denitrifying phosphorus removal. (4) The second factor to make the system of denitrifying phosphorus removal oprer- ate steadily is system operating parameters. Anaerobic HRT of too high or too low affects denitrifying phosphorus removal ,and short-term and low DO in the latter function is also key to improve the denitrifying phosphorus removal. Therefore controling anaerobic HRT is 2.5h, DO in latter function is 3mg / L, the system can improve the performance of denitrifying dephosphatation.(5) Controling in the system is also the important influencing factors, the length of SRT is selective for microbial speciese, MLSS is key to ensure long-term stable operation. Therefore controlling appropriate SRT and MLSS is essential for improving the effectiveness of denitrifying phosphorus removal. Under the experiment conditions ,to obtain the best SRT is 16d, the MLSS of anaerobic and anoxic zones is 4500mg / L.(6) According to the optimizing experiment, influent CODCr concentration was about 250 mg / L, CODCr / TP was about 50, TN / TP was about 9, anaerobic HRT was 2.5h, MLSS was about 4500 mg / L, SRT was about 16d, DO in 2# was 3 mg / L were the best conditions.(7) Under the same operating conditions, denitrifying phosphorus removal of increasing the latter aerobic time is better than the other one. TN, TP removal rate in 1# reached 82% and 76%, the effluent concentration of TN and TP were below 10 mg / L and 2mg / L ; TN, TP removal rate in 2# reached 84.38% and 84.13%, the effluent concentration of TN and TP were below 8 mg / L and 1mg / L ; In order to improve the operation performance, the reactor can be increasing the latter aerobic time.(8) Through searching the kinetic mode of the system of denitrifying phosphorus removal,combining with test data of optimal conditions in the process of dynamic equations, It can be solved the kinetic mode and kinetic parametersin this study. In TP removal kinetics, the kinetics of anaerobic phosphorus release formula was P2=P1+RP3-0.00001296xC3t; Kinetics of phosphorus absorption formula was .It can be seen above that anaerobic phosphorus absorption was relevant with the sludge concentration,HRT, sludge reflux ratio; In kinetic aspects of denitrification, anoxic denitrification kinetic formula was N1 = N 2 (1+ R?1r +)?R0 .00158xt.It Shows that nitrogen removal was relevant with \.It Shows that nitrogen removal was relevant withHRT, sludge concentration, sludge reflux ratio.