Research On Enhanced Contaminant Removal Efficiency In SBR By Adding New Biological Fluidized Media

Along with the development of Industry and Agriculture, The quantity of sewage has surpassed the ability of water clean itself. So, more efforts should be made to build and improve the sewage treatment factory, and improve the quality of environment .Because the exhaustion standard is Increasingly stringent, more effluent can't meet the emission standards, the reason is that the standards of influent and effluent were lower in that time.A Sewage Treatment Plant in Beijing used traditional the SBR craft, because the initial Influent indicator and actual Influent indicators had relatively big gap, after production, the effluent indicators has been unsatisfactory and could not achieve to the oneclass A exhaustion standard of (GB18918-2002) that Beijing requested, Even can not reach the second class exhaustion standard. In this case, the tentative plan may through adding some new fluidization padding to strengthen the traditional the SBR craft to make the effluent to reach the standards. This experiment is done to prove this tentative plan through the field test , and during the process, we get some conclusions as follows:(1) As is shown by the comparative experimental results of theprior period, SBR reactor with new style biological padding has great adaptive capacity to load pulses resulted from inflow of industrialwaste water. The removal rate of BOD₅,COD,NH₄-N,TN are 97%,92.6%,97.7%,64% respectively. The BOD₅, NH₄-N and TN in theeffluent are 8mg/L, 2.1 mg/L,37 mg/L respectively. All three indexes can meet the first class criteria A specified in the Integrated Wastewater Discharge Standard except the TN. But removal rate of TN also reaches a relatively high level of 64%.(2) Entering the wastewater continuously (in testing, as a resultof test equipment, was unable to simulate entering water continuously, therefore entered water to be possible at different times) , relief the problem that the carbon source was insufficient to a certain extent , and promote the removal effect of total nitrogen relatively.(3) After the aeration, there was little carbon source in thewastewater, the anaerobic denitrification in the subsidence time was extremely limited, the removal rate was less than 1%, in order to solve the shortage of carbon source, pretage denitrification is a good choice, as it could provide sufficient carbon source for the denitrification.(4) The simulated treatment of wastewater increased from10,000 tons to 30,000 tons, the effluent still was able to achieve a satisfactory result, COD and ammonia nitrogen could achieve therequirements of the one class A exhaustion standards. the treatmenteffect that the SBR reactor adding the padding is obviously superior than the traditional SBR reactor.(5) The aeration tube that the experiment using was same toSewage Treatment Plant, moreover, the SBR ponds of Sewage Treatment Plant were 2.7 times deeper than the test equipment, the impact on water, Sewage Treatment Plants were better than experiment that in the rate of oxygen using .moreover, the ratio of gas to water that Sewage Treatment Plants are using was between 20:1 and 23:1, but in the testing, the ratio was between 13:1 and 20:1.Therefore,it may prove that the Oxygen utilization that the SBR reactor adding the padding was higher than the traditional SBR reactor, and was more saving energy.(6) From the testing, the sludge could sediment basically in 15minutes after adding the padding, more quickly than the traditional SBR reactor, so it was useful to increase padding. In practical, since it could shorten the settling time accordingly, and it was helpful to adjust the other process cycle time .