APMP Effluent Treatment By Microwave Enhanced Iron-Carbon Internal Electrolysis Process

High yield pulping is widely accepted because of its high utilization of natural fibers and less pollutant discharge. High yield pulping process represented by APMP, PRC-APMP and BCTMP has become the mainstream of international pulp and paper industry development. But the effluent is high concentration of pollutant, is complicated in composition, and is poor in biodegradability. It not only caused great destruction to the environment, but also a serious impact on people’s health. So finding a method which is efficient for the degradation of lignin class in the waste water is a major problem to realize wastewater treatment efficiently.The inner electrolysis technology is developed based on the electrochemical oxidation-reduction reaction. This is a process by iron and activated carbon on the wastewater pollutants attached electric set, adsorption, flocculation, and filtration to achieve the purpose of the combined effects of a new method of purifying water. As a kind of advanced pollution treatment technology, Microwave Technology can kill bacteria and viruses without the formation of by-products and secondary pollution with its ultra-high frequency electromagnetic waves and high-energy electron beams. In addition, the internal heating of microwave catalysis can accelerate the break of molecular bonds.In this experiment, we combined the microwave heating technology and traditional iron-carbon inner electrolysis, which make iron and carbon mixture a continuously reaction in the inner electrolysis process. This method used the each advantages of microwave technology and internal electrolysis, improved wastewater treatment capacity.The carbon-iron internal electrolysis process enhanced by microwave was employed for APMP effluent treatment in this article. Removals of color and COD were focused to optimizing treated conditions. The optimized condition were:initial pH value was 3.0, mass ratio of carbon to iron was 3:5 and diameter of charcoal capsules was 80 mesh, at 700W power microwave radiation heat for 9min. The COD of the treated water reached at 380 mg/L from 910mg/L and the removal was about 60% at the optimized conditions. The color removal was about 75% from 2295 (C.U.) to 575(C.U.) at the same time. Microwave treatment improved the effect of carbon-iron internal electrolysis process markedly, but the application of this process on APMP effluent treatment needs to be done more and more work.By infrared spectroscopic analysis, the carbon-iron internal electrolysis process enhanced by microwave was employed for APMP effluent treatment,3400cm-1 absorption peak near the disappearance of some aromatic hydrocarbons described substances are well removed, but there are still containing C=C or C=O group of substances. After Fenton oxidation treatment,3434cm-1 absorption peak illustrate some aromatic substances persists, the absorption peaks represent near 1637cm-1 containing C=C bond of material existence.In this paper, GC-MS analysis of dichloromethane extracts are studied about the treated and untreated wastewater, showing that the total species of organic matter in the wastewater before and after treatment, and most of the organic content which have not been detected orsignificantly reduced were alcohols,phenols and benzene derivatives,unsaturated acids and etc.