Study On The Effect Of Anoxic/ Anaerobic/Deep Well Aeration On Municipal Wastewater Treatment

Songhua River is one of the important water systems in China,its water quality has a great impact on the production and life of the basin.Majiagou River as an important tributary of the Songhua River,the improvement of its water environment is of great significance,and sewage plant pollutant depth abatement has been an important issue in the field of environmental engineering.For the upper reaches of Majiagou area is very tight,high water quality requirements of sewage treatment,in the "12.5" national science and technology major projects with the support of anaerobic / anoxic / deep well aeration process depth emission reduction Study on Phosphorus Efficiency.It includes the following: high pressure aeration test study,the anoxic / anaerobic / deep well aeration test on the productivity start operation and the impact on the removal of pollutants,the impact resistance of anoxic/ anaerobic / deep well aeration production process on water temperature,water quality and water flow,Harbin Chaoyang water purification plant energy consumption and economic and technical analysis.The test was carried out under constant pressure conditions between 0.0 Mpa and 0.7 MPa in a controlled pressure reactor from a constant pressure test.Each pressure condition was run for 3.0 h,in order to examine the removal rule of COD,NH3-N,NO3-N,with time and pressure changes.The gradient pressure test was carried out under the conditions of 0.0Mpa-0.7Mpa gradient pressure for 10 min,15min and 20 min in each pressure state.The effects of COD,NH3-N and NO₃^--N show that the removal efficiency of pollutants is getting better with the increase of pressure.In the gradient pressure test,when the pressure interval is 20 min,the effluent concentration of each pollutant is: COD is 71 mg / L,the removal rate of ammonia nitrogen is 10.17 mg / L,the sludge load is 0.55 kgCOD / kgMLSS · d,the total residence time 160 min,the longer the treatment time,the better the effect of pollutant removal effect.Analysis of Microbial Population Structure in Sludge under Different Pressure Conditions by High Throughput Sequencing.The results showed that the high pressure state was beneficial to the growth and proliferation of ?-strain bacteria,which population contained a large number of biochemical functions with nitrogen and phosphorus removal.Small test study for the actual project provides design parameters.The study was conducted on the scale of production and the optimum operating conditions were explored by adjusting the operating parameters of the anaerobic / anoxic / deep well aeration process.Determine the optimum operating conditions for the influent ratio of the anaerobic section and the anoxic section is 1: 2,nitrification solution reflux ratio of 250%,sludge reflux ratio of 70%.Under the optimum working conditions,the effluent concentration of COD,ammonia nitrogen,TN,TP and other pollutants can meet the national A emission standards.When the COD reaches 1200 mg / L,the water temperature is about 10 ?,and the pollutant removal index still reaches Grade A and the effect of low temperature on the whole process is denitrification process.The results show that the pollutant removal index of biochemical treatment unit is still up to Grade A when the amount of water treated is 115% of the designed water.In the small test,the pressure of 0.7MPa degradation unit of COD consumed by the oxygen volume and the reaction pressure of 0.0MPa compared to the savings of 31.7%,degradation Ammonia nitrogen saved 32.0% by volume of oxygen,saving 45.6% when generating unit mass NO3-N.The reaction pressure is 0.7MPa.The unit volume of COD depleted is reduced by 37.7% compared with the reaction pressure of 0.0MPa,40.0% of ammonia nitrogen is saved,and 53.8% of the air volume is saved when NO₃^--N is produced.The practical application shows that the annual aeration power consumption of Chaoyang water purification plant is 322.37 million kW · h,the gas consumption of ton waste water is 1.935m³,the aeration power consumption of tons of ton water is 0.177 kW · h,The same size A²/O process water plant annual aeration power consumption is 367.41 million kW·h,power consumption of ton water is 0.201kW·h.Chaoyang water purification plant saves power about 454000 kW·h every year compared with the A²/ O water plant,12.3% of electricity consumption,the total area of the biochemical process to save 80% and the total area of more than 50% savings.Sewage treatment costs 1.971 yuan / m³ · year,include operating costs of 0.909 yuan / m³ · year,the research results for the Majiagou Chaoyang upstream sewage treatment to provide technical support,will effectively improve the ecological environment of Majiagou watershed,with a high Social benefits.