Research On Advanced Nitr Ogen And Phosphorus Removal Of Two Typical Industrical Wastewater

As the quality of water environment is more and more demanding,the discharge standard of industrial wastewater is more and more strict.Among them,ammonia nitrogen is an important index for the treatment of water environment,meanwhile,the difference of ammonia nitrogen concentration in industrial wastewater is large and the treatment process is diversified.However,there is a lack of high-standard compliance technology.Total nitrogen and phosphorus are also receiving increasing attention.Deep denitrification?total nitrogen?and phosphorus removal are also currently pressing problems in industrial wastewater treatment.In this study,two kinds of typical industrial was tewater were selected for the wastewater with low/high ammonia nitrogen concentration.Two pilot routes were proposed through pilot study.The verification test was carried out on the pilot plant and the two typical processes were compared and analyzed.Biopharmaceutical wastewater is selected as industrial wastewater with low concentration of ammonia nitrogen.ANAO and ozone activated carbon based on the principle of denitrification and denitrification are adopted.Nitrification tank fiber packing hanging membrane approach can achieve the depth of ammonia treatment,nitrification liquid back to the anaerobic denitrification can achieve the depth of nitrification and phosphorus treatment,ozone activated carbon can achieve the depth of COD treatment.Pilot system using "first nitrifying bacteria and denitrifying phosphorus removal bacteria domestication alone,after the integration optimization" startup mode,which lasted 45 days,the successful completion of the system startup.The results showed that the combined process of ANAO and ozone activated carbon could stably realize the deep denitrification and phosphorus removal of biopharmaceutical wastewater,and the effluent could reach the standard of surface water level IV?TN<5 mg/L?.The average concentration of COD,NH₄⁺-N,TN and TP were 7.4 mg/L,0.1 mg/L,3.8 mg/L and 0.18 mg/L,respectively.Based on the small scale biological fluidized bed reactor,the pilot scheme of biochemical technology was explored and the pilot plant system was constructed.The performance of nitrogen and phosphorus removal system was investigated through commissioning and operation.Experiments showed that the high salinity had an adverse effect on the biological nitrogen removal,but the system still maintained a good pollutant removal effect under the condition of salinity ?20‰ through domestication mode of "gradual increase of salinity".On the other hand,high concentration of COD has a greater impact on the removal efficiency of NH₄⁺-N.Based on the results of the pilot study,the technology of "multi-stage fluidized bed + BAF + Fenton" was put forward to carry out the pilot study.Pilot start using "control of water flow,and gradually increase the water load" approach,which lasted 50 days,the system starts to complete.The results of pilot-scale operation showed that the pilot-scale process has a stable treatment effect on highammonia and high-ammonia wastewater.The average concentrations of COD,NH₄⁺-N and TP in effluent were 29.83 mg/L,1.3 mg/L and 0.22 mg/L,respectively,all of them can reach the Class IV water standard of surface water stably.Through the comparison of two typical industrial wastewater,for the industrial wastewater with low concentration of ammonia nitrogen,the technology based on the combination of biochemical treatment and physicochemical treatment based on denitrification and denitrification and denitrification can be used to reach a high standard and remove the total nitrogen and total phosphorus.For industrial wastewater with high concentratio n of ammonia nitrogen,biochemical and chemical methods should be combined before and after.Ammonia nitrogen should be removed by biochemical method and part of total nitrogen should be removed by intensified denitrification.Total phosphorus can be removed chemically after biochemical method.For COD in wastewater,advanced post oxidation treatment is advanced for high emission standards.