Study On Optimized Operation Parameters Of Denitrifying Phosphorus Removal And Electrogenesis System

The shortage of energy and the pollution of the aquatic environment have gradually become major challenges in determining the future destiny of mankind.Therefore,researchers have conducted in-depth research on the development of clean energy and the renewable use of water resources.This project uses artificial simulation to prepare low C/N urban domestic sewage as raw water.The denitrifying phosphorus removal and electrogenesis process is used to study the effects of various influencing factors on the stable operation of the system,and optimize the control parameters of the process.A certain result has been achieved.The denitrifying phosphorus removal and electrogenesis process is based on the dual sludge system and denitrifying phosphorus removal theory,combined with MFC technology.Denitrifying phosphorus removal technology is used to remove pollutants in water,such as COD,N,P,etc.;MFC technology is used to directly convert chemical energy in sewage into electrical energy.Nitrifying bacteria and DPAOs exist in separate reaction tanks,which overcome the contradiction of sludge age in single sludge system,and weaken the competition between carbon phosphate and DPAOs for carbon source,and greatly improve nitrogen and phosphorus removal.Efficiency and system stability.In order to further understand the factors affecting the efficient and stable operation of the denitrifying phosphorus removal and electrogenesis process,the author first carried out the trial operation phase of the process system.After 41 days of commissioning operation,the nitrogen and phosphorus removal and carbon removal effects and power generation performance were gradually improved.And tend to be stable.The average removal rates of COD,ammonia nitrogen and phosphorus in the final DPRE system were 89.69%,75.33%and 76.11%,respectively.The average effluent concentrations were 11.34 mg/L,6.48 mg/L and 1.68 mg/L,respectively.The DPRE system has an open circuit voltage of up to 0.621V and an average open circuit voltage of 0.519V,which produces good electrical performance.Secondly,on the basis of trial operation,we entered the experimental operation stage of exploring various influencing factors.The author continued to treat the system and produce electricity under different gradient influent salinity,influent pH,influent temperature and nitrifying sludge reflux ratio.Performance analysis and analysis.The results show that when the influent salinity is 0.5 g/L NaCl concentration,the influent pH is 7±0.2,the influent temperature is 20?,and the nitrifying sludge reflux ratio is 1,the denitrifying phosphorus removal process produces COD.The average removal rates of ammonia nitrogen and PO43-P in the last three days were 94.89%,84.77%,and 81.18%,respectively.The average effluent concentrations in the next three days were 8.9 mg/L,1.57 mg/L,and 1.26 mg/L,respectively.The average anoxic denitrification rate was 89.56%.The MFC has an ohmic internal resistance of 102.64 ? and a maximum power density of 131.41 mW/m3.At this time,the system has the best effect of nitrogen and phosphorus removal and carbon removal,and the electricity production performance is good.All the operating parameters established in the study are defined as the optimal control operation parameters of the test.