Research And Application Of Bottom Microporous Aeration And Partition Of Oxygen Supply Technology

The conventional surface mechanical aeration in oxidation ditch existed someproblems, such as low efficiency aeration, high energy consumption, poor handling,regulation inconvenience and others. In order to solve these problems, regarding theFirst Kunming Sewage Treatment Plant as the research object, presented the upgradeprogram that replacing surface mechanical aeration with the microporous bottomaeration, under the premise without changing the structure of the pool. Throughresearching and appllying partitioning oxygen technology, optimize the health of theoxidation ditch, improve the oxidation ditch treatment effect of pollutants, and reduceenergy consumption.In order to find the best partitions in bottom aeration oxidation ditch, SBRcoupled oxidation ditch analog device was used for simulating the partitions of aerobicmode in oxidation ditch. Simulated different A/O ratio (the length of the anoxiczone/aerobic zone length) and aeration modes under different AO numbers. The resultsshowed that the less AO numbers are, the better effection of denitrification was. Whenthe A/O ratio was1.5:1to2:1, the effect of total nitrogen removal was the best, and theammonia removal rate was high. In different aeration modes, there were differentpathways of using the carbon source. By material balance calculations, the morecarbon source used for denitrification process and the less carbon was oxidized underthe optimized partitions.Based on the above research and combined engineering practice, the findings ofSBR coupled oxidation ditch analog device were used in the debugging of bottommicroporous aeration oxidation ditch. The aeration modes were applied to different partitions in parallel oxidation ditch process. The application effect of practicalengineering was in accordance with simulation results. Water quality monitoringresults showed that the effect of effluent was best under A/O ratio of2:1,1AO inoxidation ditch. And compared with the original surface mechanical aeration oxidationditch, the total nitrogen removal efficiency in bottom aeration oxidation ditch hasgreatly enhanced, and the water quality is stable. Modified oxidation ditch hasachieved the purpose of saving energy and reducing consumption, energy consumptionwas reduced by20.11%.