The Research On Applying Extended Sbr To Disposing The Starch Wastewater Of Mid And High Concentration

As some limitations exiting in the traditional SBR, the technologies of SBR, ABR and carrier techniques are combined to dispose the starch wastewater of mid and high concentration in this study. And the startup of the system of ABR+SBR, biomorphic distribution and the volume rate of aerobic/anaerobic are researched, and it is implied that the system of ABR+SBR is dependable in disposing the starch wastewater of mid and high concentration. Furthermore, in the system of composite SBR which combined the technologies of SBR and technique of carriers, the selection of the carriers, the design of the configuration of SBR, the startup of the system of the composite SBR and the biomorphic distribution are researched, and it is found that the composite SBR not only has good removals of pollutants in disposing starch wastewater at the optimized pH, temperature, but also has the ability of sustaining the fluctuation of the organic loading and hydrodynamic loading. Finally, the ability of removing pollutants and the stable-abilities of the composite SBR and the traditional SBR are compared.In the tests, it is indicated that the microorganism in the combination technology of ABR+SBR could be domesticated within a month (aerobic microorganism only needs one week, but the anaerobic microorganism in ABR needs longer time). After analysis of the biomorphic distribution in the system of ABR+SBR, it is found that there are not only common microorganisms appearing in the aerobic, anaerobic and anoxic environments, but also some Monascus. And at the steady stage, when the HRT has 14 hours, volume loading is 1.04 kgCOD/m3·d, it is found that the system of ABR+SBR has removals of COD, NH4+-N, TP and TN are above 90%, about 80%, above 70% and above 80% respectively, and the concentration of COD and NH4+-N in the effluent is below 60mg/L and lmg/L respectively.Furthermore, in the research, it is found that the time of the startup of the composite SBR is within one week, and the biomorphic distribution is similar to the activated sludge system and with high concentration of Metazoa. And when it is at the steady stage, without the effect of pH and temperature, and using the mode of aeration 5 hours every 6.5 hours, though the COD, NH4+-N and TP in the influent are 400-1000mg/L(the average is 700mg/L), 1-16mg/L, and 0.5-2.5mg/L respectively, COD, NH4+-N and TP in the effluent could be below 100mg/L(most time is 60mg/L), 1.5mg/L and lmg/L respectively, and the average removal rate of COD, NH4+-N and TP are 81.5%,81.5%,81.4% respectively. Compared with the traditional SBR, the ability of removing pollutants and stable-ability of composite SBR in disposing the starch wastewater is better.