Effectiveness Research On Using E-fenton With New Type Of Ni Electrode To Pretreat Dyeing Printing Wastewater

Printing and dyeing industry is one of the most important economic sectiors. The wastewater from this industry has become a major source of industrial wastewater. The dyeing printing wastewater is a kind of typical recalcitrant wastewater for its high chroma and complex composition. It is necessary to find a fast and efficient pretreatment to reduce colour of wastewater, while improving its biodegradability.In this study, we use printing and dyeing wastewater which from a northern textile mill as research subjects. Using Electro Fenton(E-Fenton) method to treat dye wastewater with foam Ni and graphite as cathode respectively. Study the effect of various parameters on the process influence on dye wasterwater treatment and optimized conditions, meanwhile compared the E-Fenton process with different cathode material. Ultimately, better results at the wastewater pretreatment achieved.Research C/C E-Fenton system which anode and cathode are graphite plates and C/ Ni E-Fenton system which anode is graphite and cathode is foam Ni. By changing the main factors p H and Fe2+ concentration making E-Fenton process achive optimal. We find in E-Fenton system the optimal condition is p H 3, C(Fe2+)=15 μmol/L nomatter using which material as cathode. The production rate improve significantly in E-Fenton system with the foam Ni cathode compare with graphite cathode. The higher p H, the less efficiently Fe2+ consumption. The lower p H, the higher H2O2 production. The optimal p H for ?OH production is p H 3 and 15 μmol/L Fe2+.We used E-Fenton method to treat Rh B wastewater prove ?OH is the main oxidizing agent for Rh B degradation. By fluorescence spectrometer and LC-MS analyzing Rh B degradation processes and products, we found the fluorescence peaks of wastewater changed significantly and some fluorescence still existed after degradation. Using LC-MS analyzing wastewater, we found Rh B molecules were gradually broken down into small molecules in reaction. Although the Rh B wastewater color took off, not fully degraded organic matter.Using E-Fenton method to treat actual dye wastewater found that the use of C/Ni E-Fenton system can significantly improve wastewater B/C, remove wastewater colour at low current and enhance the current efficiency. Using GC-MS analyzing actual wastewater indicates the relative amount of macromolecule and molecule which contain chromophoric group reduced and the relative amount of micromolecule increased consistent with the chroma reduced and B/C increased.