Sodium Hypochlorite Treatment Of Refractory Organic Dyeing Wastewater

High efficiency, low cost treatment for refractory organic technology is the hotspot and difficulty in the study of environmental management. Sodium hypochlorite method widely used in treatment of pollutants, with its good treatment effect, simple equipment, investment and other economic advantages and attention. In this paper, using sodium hypochlorite treatment of three aryl methane dyes, azo and anthraquinone dyes, and the analysis of treatment effect and the relationship between the molecular structure of the material.By orthogonal test and single factor experiment, determine the target substance using sodium hypochlorite method for processing the reasonable operation conditions, including sodium hypochlorite dosage, reaction time, the initial dye concentration. In order to anthraquinone dyes as an example, through the single factor experiment to determine the effect of sodium hypochlorite treatment of anthraquinone dyes and the best operating conditions. Weak acid brilliant blue RAW (concentration is 40mg/L):sodium hypochlorite dosage is 0.3mL, reaction time 2.5h, under the conditions of weak acid brilliant blue RAW removal rate was 94.28%, COD removal rate can reach to 63.82%. Weak acid brilliant green GS (concentration is 40mg/L):sodium hypochlorite dosage is 1.0mL, reaction time 3h, under the conditions of weak acid brilliant green GS removal rate was 92.52%, COD removal rate can reach to 69.45%.On the reaction kinetics study found, sodium hypochlorite treatment target material response are approximately shows a first-order kinetics characteristics.This study selects the appropriate dye molecular structure descriptor, by means of linear regression, several target three aryl methane dyes and azo dyes were investigated by molecular structure with sodium hypochlorite method in the study of the quantitative relationship between the removal effect. Study found that target three aryl methane dye removal rate and sulfonic acid number, I/O, aromatic ring number and ethylene alkyl number existed good linear correlation between the I/O value, to target three aryl methane dye removal rate influence the most significant contribution; target azo dye removal rate and sulfonic acid number, I/O, aromatic ring number and azo number existed good linear correlation between the I/O value, the target of azo dye removal is affected the most significant contribution.