Study On D-A~2O Process Effectiveness Of Sewage Treatment And Process Optimization

The study design of the double anaerobic/anoxia alternative operating A²O?D-A²O?reactor,which is characterized as follows:?1?From the structural characteristics of the reactor,we can found that the structural characteristics of D-A² O in a two-phase anaerobic/anoxic alternately running style and D-A²O reactor designed a separate system with the two-phase reactors,nitrification and sludge return reflux systems,two-phase alternating operation largely resolved the way into the anoxic nitrification liquid pool DO affect denitrification effect,thus ensuring efficient removal of nitrogen.?2?From the operating characteristics of the reactor,the D-A²O reactor integrated A²O process and the principle of SBR process characteristics.Especially the SBR process have many similar periods,such as the influent period,the reaction period,precipitation and drainage Drainage sludge of the stages.The main contents of this paper that by optimizing the D-A²O reactor operation method and structural improvements to further enhance the effectiveness of the system in terms of nitrogen and phosphorus removal wastewater treatment,as well as to explore its optimal operation,energy saving and other aspects of feasibility.Designed to meet the social development needs of the design of an efficient operation with nitrogen and phosphorus removal,energy saving new sewage treatment system.With the further research of the trial study,based on the results of D-A²O trial,when sewage low C/N ratio and anaerobic conditions anoxic microbial competition for nitrogen and carbon is still hampered the key factor to further improve phosphorus removal.Considering two reasons:?1?If we are taking into account the improve the effectiveness of nitrogen and phosphorus removal process A²O timely shorten HRT,nitrogen and phosphorus removal efficiency shall be resolved within the system can be used directly as a result of lack of carbon lower overall problem fundamentally.?2?If we can take measures to address the adverse effects of the run process D-A²O that due to improved technology resulting from the reflux ratio,greatly improved the system nitrification/de-nitrification and phosphorus release and the extent of uptake capacity that its nitrogen and phosphorus removal efficacy would be significantly enhanced.Based on the above point of views,the study of the original D-A²O way of influent was improved partition type way?anaerobic/anoxic water ratio of 8/2?,so the partition type influent D-A²O reactor is formated.Study shows that the partition type influent D-A²O reactor in treatment domestic wastewater are highly efficient,and its removal efficiency COD,nitrogen and phosphorus is much higher than the existing A²O process,SBR process and other processes.In view of our group the partition type influent D-A²O reactor have optimum water quality,the author believe that the Arco Mats R ecological fabric can be located in partition type influent D-A²O reactor effluent drainage ditches,forming a Arco Mats R ecological drainage,there may be a small increase in infrastructure investment under conditions more significantly improve water quality.Based on this view,the research team designed the partition type influent D-A²O integrated the Arco Mats R ecological ditch sewage treatment system,and the results of trail that the COD,TN,NH₃-N,TP average water content can be reduced to 10.56mg/L,1.04mg/L,0.96mg/L,0.107mg/L,water quality can be partially approached or reached between the IV-V surface water quality.Obviously,this technology matures and promotion,there are highly economic,social and environmental benefits.This will also make the promotion and application of the technology has long-term market protection,and this is exactly what the significance of this research lies.