Application of Improved AAO Process for Refined Denitrification Control Technology in a WWTP
Taking a municipal wastewater treatment plant(WWTP)using AAO process for example,current operational problems of low carbon nitrogen ratio(C/N)influent and high carbon source dosage denitrification were analyzed respectively.Its refinement operation measures of denitrification were studied respectively and a systematic operational strategy for denitrification was established,which included carbon source dosage and reflux ratio linkage control.The best internal re-flux ratio was adjusted in real time according to the ammonia nitrogen(NO3--N)concentration in anoxic zone.Meanwhile,the external carbon source was dosed flexibly accrording to the nitrate nitrogen concentration in anoxic zone.Thus,the wasted part of carbon source due to oxygen dissolved in internal reflux could be minimized.After adjustment,per ton of carbon source dosage decreased from 60 g to 20 g,and the carbon source dosage could be saved by 12 ton each day(sodium acetate solution with effective mass fraction of 20％).About 0.468 million yuan per month could be saved.The indirect carbon emission generated from external carbon source was cut down by 430 ton annually.At the background of peak carbon dioxide emissions and carbon neutrality,the operational strategy is valuable for the refinement operation of WWTP with similar low C/N influent.
万方数据
维普
