Advanced Treatment Of Cookery Wastewater And Mechanism By Fluid Three-dimensional Electrode Reactor

Advanced treatment of cookery wastewater by electrochemical oxidation in the three-dimensional fluid electrode was investigated in this thesis.The effects of operating conditions on the oxidation efficiency of organic pollutants, such as cell voltage,electrolyte concentration,and activated carbon packed weight,initial pH, residence time and aeration were also investigated.The experimental results show that impulse of the reaction voltage has the most notable impact the reaction and when at 1.5 V/cm has the best result.Initial pH is the secondary determinant factor on the reaction.The acidic media is favorable for the oxidation of organic pollutants due to the formation of strong oxidant such as hydrogen peroxide;the best initial pH is 2.The best aeration is 30 m³/(m²Â·h).Activated carbon packed weight is another notable factor on the reaction and the oxidation ratio can be improved rapidly with the increasing of the activated carbon bipolarized.The best packed weight is 100 g/L.The cost increases along with the residence time so the best residence time is 60 min.The removal rate of COD and decoloration rate were 70%and 84%,respectively,and the B/C(BOD₅/COD) ratio of effluent increased three times of influent.The analysis result of UV spectrum and HPLC showed part of chemicals degradation,composition change and intermediate products generation in the wastewater during the electrolysis reaction.In addition,Multiphase-catalysis is coupling in on the basis of the experiment above. The result shows that when FeSO₄ was 310mg/L,H₂O₂ was 250mg/L and the proportion of COD:H₂O₂:FeSO₄ goes to 5:5:6 a best result appeared in the experiment of multiphase and multielement catalysis,the removal rate of COD was 86.5%.The simple cost calculation shows that process of multiphase and multielement electrolysis catalysis oxidation is lower than fluid three-dimensional electrode reactor.