A method for treating methylene blue in printing and dyeing wastewater

Abstract

The invention relates to a method for processing methylthionine chloride in a printing and dyeing wastewater, and belongs to the field of sewage treatment. The method comprises the following steps: crushing aluminum foil powder into aluminum powder by virtue of a fluid jet mill, screening the aluminum powder into 200-300-mesh powder; putting the screened aluminum powder in 30% ammonium peroxydisulfate for 1-2 hours; adding 3%-5% of urea, stirring at 60-70 DEG C for 2-3 hours, and adding 10-50ppm of sodium dodecyl benzene sulfonate and stirring for 1-2 hours; vacuumizing at 80-90 DEG C to dry by distillation at 60-70 DEG C; under protection of nitrogen, heating to 800-900 DEG C to obtain the modified aluminum powder adsorbent; uniformly mixing the modified aluminum powder adsorbent with the activated carbon at the ratio of 1 to 5, feeding to a sodium hydroxide solution with the mass concentration being 5% to soak for 12-24 hours; filtering the mixed solution, and drying in a muffle furnace at 100-105 DEG C, wherein the concentration range of the raw wastewater is 620-670mg / L; and finally putting the modified aluminum powder into the wastewater, wherein the concentration range of methylthionine chloride in the printing and dyeing wastewater is 0.75-0.87mg / L by detection, and the removal rate is 99.87%.

Description

technical field [0001] The invention relates to a method for treating methylene blue in printing and dyeing wastewater, belonging to the field of sewage treatment. Background technique [0002] In recent years, printing and dyeing enterprises have produced more and more types of products. In addition to different production methods, the fiber composition has also changed greatly. Especially in recent years, with the rapid development of chemical fibers, the quality of wastewater discharged during the production process has also often changed. The color of printing and dyeing wastewater is changeable, the chroma is high, and it becomes black when it is discharged into the river. Chromaticity is one of the main control indicators of printing and dyeing wastewater. The main reason for the chroma of printing and dyeing wastewater is dyes, which are in the transitional stage of material transformation. The nature is extremely unstable, and the COD value is very high. According t...

AI Technical Summary

Problems solved by technology

[0003] At present, physical and chemical methods, biological methods and electrochemical methods are mostly used to treat methylene blue in printing and dyeing wastewater. Commonly used physical and chemical methods include ion exchange, ultrafiltration, membrane technology, etc.; chemical methods such as coagulation, oxidation, electrolysis, etc.; Methods include anaerobic and aerobic processes, etc. From the wastewater treatment processes and effects of some domestic dye factories, it is difficult to achieve the unity of removal effect, economic cost, and ecological protection by using traditional physicochemical and biochemical methods to treat dye wastewater. still difficult to meet

However, the electrochemical method consumes a lot of electric energy and consumes too much electrode material. When the concentration of reactants is not high, the processing time is prolonged and the current efficiency is low.

so none of these methods do a good job of removing it