Research On Degradation Of Aquaculture Wastewater By Lead Dioxide Electrode Prepared Through Anodization

With the rapid development of social economy in recent years,the problem of water pollution has become increasingly serious,and various water treatment technologies have become to research hotspots.In the livestock and poultry breeding industry,due to the heavy use of various types of antibiotics,feed additives,etc.,COD after traditional biochemical treatment is still relatively high,and it has been unable to meet the needs of environmental protection.This paper studies the method of using lead dioxide?PbO₂?electrodes prepared by anodic oxidation to degrade bio-refractory organics in water.The effects of different process conditions on the catalytic performance,service life,and actual degradation effect of the electrode are discussed.Firstly,the anodizing mechanism of the lead electrode was analyzed by linear sweep voltammetry?LSV?and cyclic voltammetry?CV?method.The test results show that the oxidation reaction of Pb electrode at 1.5 V/vs.SCE is changed to PbO₂,and the method of anodization to prepare PbO₂ electrode is feasible.Secondly,the catalytic degradation of p-nitrophenol by electrode was tested.LSV test results showed that p-nitrophenol was oxidatively decomposed on the surface of prepared PbO₂ electrode.The microstructure of the surface layer of the electrode was analyzed by SEM and XRD results,and the preparation process was improved.The Pb was firstly heated to indicate that a PbO oxide layer was formed first,and then in a 0.1 mol/L sodium sulfate solution,1.5 V/vs.SCE.The peroxo-electrodes prepared by potentiostatic anodization have different crystal forms of PbO₂ intercalated with each other on the surface,so that they have good conductivity and electrocatalytic properties,but also have strong binding force.The results of accelerated aging experiments show that Life is above 1800 h.The solid surface PbO₂ layer still has good integrity after a long time of use.After the accelerated test,the Pb content of the water sample is below 0.05 mol/L,which avoids the secondary heavy metal pollution to the wastewater and is of significance to the actual production and use.Finally,the prepared PbO₂ electrode was used to treat the actual wastewater.The test result of the laboratory mini-electrode showed that after 60 min electrolysis,the actual wastewater COD decreased from 153.6 mg/L to 54.1 mol/L,the COD removal rate was 64.8%,and the BOD/COD rose from less than 0.1 to 0.7.A large-scale plate was prepared to conduct a pilot test at the site.The results of five-day continuous tests showed that the anode has good removal capacity for COD in wastewater.When the COD in the water is about 200 mol/L,the COD in the effluent is stable below 70 mol/L after reaching 30 min and reaches the discharge standard.BOD/COD increased from less than 0.1 to about 0.45,improved the biodegradability of wastewater,and provided a basis for further treatment of wastewater.