Study On The Phenol Wastewater Treatment By Activated Carbon Fibre Cathode Electro Fenton Method

Electro Fenton method is a new wastewater treatment method, which is developed from the traditional Fenton method. In recent years, it was given great concern at home and abroad. The study used electrochemical method to make the Fenton reagent, the three-dimensional electrode reactor was self-made. It applied activated carbon fiber cathode to treat phenol wastewater, and studied its process conditions and mechanism systematically. The experiment investigated the removal rules of phenol in the samples, and it provided technical basis for treat refractory organic wastewater by activated carbon fiber cathode Fenton method.The main contents of the study were as follow:â‘ The electrode materials were chosen in the activated carbon fiber cathode Electro-Fenton method;â‘¡The single factor influence experiment, orthogonal experiment, and reaction kinetics of activated carbon fiber cathode Electro-Fenton method were studied;â‘¢Particle electrode pollution in the activated carbon fiber cathode Electro-Fenton method were studied;â‘£Two-dimensional and three-dimensional electrode of activated carbon fiber cathode method to dealing with phenol wastewater were comparison.Titanium coated ruthenium iridium electrode as the anode material of the experiment was more suitable than iron and graphite. Titanium coated ruthenium iridium electrode treating phenol had a good effect. By scanning electron microscopy (SEM), the electrode was founded that the performance of the electrode surface was good. Chemical stability, conductivity, electrode potential and catalytic performance of the electrode were also good and durable; Activated carbon fiber electrode as the cathode material of the experiment was more suitable than iron and graphite. It had a big surface area, and its mineralization capacity was good. It had a more significant effect on treating the phenol. When the column carbon particle diameter of the particle electrode material in the reactor was 3mm, it had the best treatment effect than other specifications column carbon and grain carbon. The suitable dosage of the activated carbon was 500g. While increasing activated carbon dosage, the effect was not obvious on the phenol.The study got the different level effects on dealing with the phenol wastewater by single factor experiment, such as pH, influent phenol concentration, reaction time, electrolysis voltage, Fe2+ dosage concentration, aeration, electrolyte dosage concentration and electrode spacing. And pH, electrolysis voltage, Fe2+ dosage concentration, electrolyte dosage concentration and electrode spacing had big effects on treating the phenol wastewater. The optimal reaction conditions were determined by orthogonal experiment. When pH was 3.0, reaction time was 120min, electrolysis voltage was 15V, Fe2+ dosage concentration was 0.6mmol/L, aeration was 0.6m3/h, the concentration of electrolyte dosing was 1.2g/L, and electrode distance was 10.5cm, the experiment got the optimal reaction conditions. Under the optimal reaction conditions, the removal rate of the phenol and COD were respectively 88.61% and 83.37%. The process of activated carbon fiber cathode electro Fenton method degradation phenol was conformed to pseudo-first-order reaction kinetics model, fitting effect was good.When the particle electrode used repeatedly and the particle electrode didn't wash out, the phenol degradation rate was decreasing with the operation cycle was increasing, and the particle electrode was polluted heavily. With the operation cycle was increasing, the electrolysis voltage had a great effects on the reduction trend of the phenol removal rate curve. Relative to 10V and 30V, when voltage is 20V, the phenol removal rate decreased the most slowly, particle electrode pollution was the smallest, and aeration was benefit to degrade phenol. After running 30 cycles, the phenol removal rate raised about 18% than the situation without aeration, and the particle electrode pollution was small.The comparison results of two-dimensional and three-dimensional electrode of activated carbon fiber cathode method to dealing with phenol wastewater showed that: Under the same reaction conditions, three-dimensional electrode method is higher above 16% than two-dimensional electrode method, and when the phenol removal rate ws about 90%, three-dimensional electrode was energy-saving almost 40% than two-dimensional electrode. At the same time, the requirements of pH of three-dimensional electrode method was lower than two-dimensional electrode method, and it was possible to treat a higher concentration of phenol wastewater, it also needed low voltage and electrolyte.Activated carbon fiber cathode electricity Fenton method dealing with phenol wastewater is superior to other cathode electricity Fenton method. And the operation of the method is easy. It doesn't have secondary pollution, it is also more energy-saving and high efficiency than conventional two-dimensional electrode. It is one of the effective method to treating refractory organic wastewater, and has a wide application prospects.