Degradation Of Chlorophenol Organics Wastewater By Three-dimensional Electrode Reactors

With the rapid development of the modern industry and urbanization process,the resulting water pollution has become a serious problem that needs urgent solution.Chlorophenols are widely used as organic solvents in drug research,dye industry,fine chemicals,etc.Because of its strong toxicity,high chemical stability,and difficulty in biodegradation,so it seriously threatens the natural environment and human security.Three-dimensional electrode method has been widely used in the field of water treatment due to its advantages of high processing efficiency,environmental protection and low cost,etc.In this paper,taking the three-dimensional electrode method as the research direction and the chlorophenol organics as simulated pollutants,the degradation effect and reaction mechanism of chlorophenol organics are studied in depth.In this work,the main simulated pollutant is 4-chlorophenol?4-CP?,three-dimensional electrode reactor used to remove 4-CP in wastewater experiment,three different electrode systems?titanium cathode-titanium anode,titanium cathode-stainless steel anode,titanium cathode-catalytic anode?Ti/Ru-Ir-SnO₂??are used for electrolysis tests,other conditions are the same,the results shown that maximum 4-CP removal rate is 92.66%by using cathode-catalytic anode?Ti/Ru-Ir-SnO₂?electrode system.The SEM characterization and electrochemical performance of the reaction electrode shown that,the catalytic electrode plate has better catalytic performance and corrosion resistance than titanium electrode plate,therefore,this experiment will select the titanium cathode-catalytic anode system for electrochemical degradation of 4-CP.Control variable method is carried out to study the influences of initial concentration,applied voltage,conductive particle dosage and electrolyte?NaCl?concentration on the treatment of 4-CP wastewater by three-dimensional electrode method,further apply response surface methodology to optimize various influencing factors and determine the best reaction conditions:the initial concentration is 50 mg/L,the applied voltage is 10.93 V,the conductive particle dosage is 6.33 g,and the electrolyte?NaCl?concentration is 0.83 g/L,under this optimized condition,4-CP removal rate up to 90.55%.Self-made plastic fillers and activated carbon fillers are used to compare the electrochemical degradate 4-CP effect,and study the reusability and regenerability of two fillers,the result shows,the plastic filler particles have better degradation of 4-CP,the reusability and regeneration are also better than activated carbon fillers.A dynamic three-dimensional electrode method is designed to cooperate with biodegradation of 4-CP,that is,waste water samples are first subjected to three-dimensional electrolysis reaction and then biodegraded.Study shows that biodegradability of water samples at different electrolysis times:electrolysis 30 min>electrolysis 20 min>electrolysis 10 min>raw water?not electrolysis?,further shows that electrolysis is beneficial to the biodegradation of waste water solution,and provides a reference for the feasibility of electrolysis and biological treatment of wastewater organic compounds.With 2-chlorophenol?2-CP?,4-chlorophenol?4-CP?and 2,4-dichlorophenol?2,4-DCP?as target pollutants,the effect of the structural properties of pollutants on electrochemical oxidation degradation is discussed,research shows,three chlorophenol organics in the three-dimensional electrode reactor constructed in this paper have good degradation effects,and their oxidative degradation processes conform to the first-order reaction kinetic model,and the sequence of reaction rate constants is:4-CP>2-CP>2,4-DCP.The degradation kinetics and degradation mechanism of 4-CP by three-dimensio nal electrode method are studied,through the determination of intermediate products produced during the degradation reaction,research shows,three-dimensional electrode method has a significant effect on 4-CP degradation,phenol,hydroquinone and benzoquinone produced in the reactor,further conversion to oxalic acid,acrylic acid,succinic acid formic acid,acetic acid and other small-molecule organic acids under the oxidation of·OH?H₂O₂ and other strong oxidizing substances,finally,small molecule organic acids are oxidized to CO₂ and H₂O.The mechanism of electrochemical degradation of chlorophenol organics is mainly through the oxidation reaction of active substances such as·OH and H₂O₂,and the reaction process follows the first-order reaction kinetics.In this paper,electrochemical oxidation degradation of chlorophenol organics is carried out by construct a three-dimensional electrode reactor,proves that the degradation of chlorophenol by three-dimensional electrode method is better than that by traditional two-dimensional electrode method,further verify that the catalytic anode and two conductive particles have highly efficient catalytic degradation of chlorophenol organic compounds;the experimental study on the treatment of chlorophenol organics by three dimensional electrode method and biological method,and provides an important technical reference and basis for the feasibility of electrolysis and biological treatment of wastewater organic pollutants.