Catalytic Electrolysis Treatment Recycled Paper Wastewater

Papermaking industry with wastepaper gets more and more important.The main pollution source of regenerate papermaking industry is from washing during pulping.The pollution loading of the techniques with wastepaper is lower,but it is still far from over emission standards.The catalyzed iron inner electrolysis process is a new developed method for wastewater treatment,which is easier for the refractory organic pollutants to turn into biodegradable matters.In this paper,using COD decreasing rate and decolour rate as targets,five factors affecting catalytic effect were selected to proceed L₁₆(4⁵) orthogonal experiments,such as weight ratio of iron and copper,initial pH value,reaction time,reaction temperature,dilution multiple.Making up the primary and secondary factors,the optimizations were determined. Factors affecting COD decreasing rate and decolour rate in treating regenerate papermaking industry wastewater by the catalyzed iron inner electrolysis process were studied,and on the basis of mono-factor test,optimum experiment was carried out.Based on these experiments, the degradation of organic matter in wastewater was carried out to the kinetic analysis,and the catalytic electrolysis reactor was studied to design.Experimental results show that the optimal condition is weight ratio of iron and copper 2:1,initial pH value pH=6,reaction time 1h,reaction temperature 30℃,dilution multiple 2,COD decreasing rate is 51.6%and decolour rate is up to 96%.The kinetics model of the catalyzed iron inner electrolysis process in this paper was fit for 1-order or 1.8- order reaction.At the acidic condition,the rate constant of COD removal of the experiments for treating regenerate papermaking industry wastewater by the catalyzed iron inner electrolysis process was k=0.000033(mg/L)^-0.8.d^-1.The acidic condition of the catalyzed iron inner electrolysis process was recommended in the practical engineering.Studies have proved that the catalyzed iron inner electrolysis process of recycled waste water treatment works well,the application of a broad prospect.