Method for degrading synthetic dye through compound system

Abstract

The invention discloses a method for degrading a synthetic dye through a compound system, which belongs to the field of wastewater processing. The method has the following processing steps of: (1) adding printing and dyeing wastewater into a reactor, wherein the chrominance of the printing and dyeing wastewater to be processed is equal to or lower than 50000 times of chrominance; (2) respectively and sequentially adding zero-valent iron, a white-rot fungus film and an acid-secreting bacterium film into the printing and dyeing wastewater; and (3) carrying out decoloring processing after adding the processing materials, reacting under natural conditions at the temperature of 20 to 40 DEG C and under a normal pressure, and stirring once at intervals of 5 to 7 hours until the decoloring rate and the chrominance are kept stable. Through the method, the advantages of individually processing the zero-valent iron and white-rot fungi are integrated, the advantages of higher decoloring rate and lower processing-fluid toxicity are represented, the acting strength of the zero-valent iron and the white-rot fungi can be enhanced through the introduction of acid-secreting bacteria, synthetic dye wastewater can be processed with high efficiency, the decoloring rate reaches more than 85 percent, and compared with a method for individually processing the white-rot fungi, the processing time is shortened by about 43 percent.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for efficiently degrading synthetic dyes in dye wastewater by using a composite system of iron powder, white rot fungus pellicles and acidoxyn bacterium pellicles. Background technique [0002] Synthetic dyes are common water pollutants in industrial wastewater from textile, leather, printing, medical and other industries. The components are complex. The wastewater contains a large amount of organic matter and salt. It has the characteristics of high COD and deep color. Dye wastewater contains various types Synthetic dyes, such as anthraquinones, azos, triphenylmethanes, phthalocyanines and other dyes, most of these dyes are carcinogenic, teratogenic, mutagenic and other hazards. When these dyes are discharged into water bodies, they will harm To aquatic organisms, it will have harmful effects on the liver, gills, kidneys, intestines, gonads, pituitary cel...

AI Technical Summary

Problems solved by technology

The decolorization speed of zero-valent iron is fast, and the decolorization rate can reach more than 80% even within tens of minutes, but there is a shortcoming that pollutants cannot be completely removed (Wang Wenjun, Ruan Hongquan, etc., research on the reduction and decolorization conditions and mechanism of zero-valent iron in Congo red, Environmental Science and Management, 2008), and the reaction must be carried out in a low-pH environment, so as not to form a passivation layer on the iron surface (Tang Xinhu, Huang Lisha, etc., Ultrasonic Synergistic Zero-valent Iron Degradation of Active Brilliant Red X-3B, Environmental Science, 2006) , but since most dye wastewater is alkaline (Joe MH, Lim SY et al., Decolorization of reactive dyes by Clostridium bifermentans SL186 isolated from contaminated soil, World J Microbiol Biotechnol, 2008), the pH of dye wastewater should be reduced when treating wastewater, which will increase the cost and cause secondary pollution and other problems

The white rot fungus degradation method has the advantage of completely degrading the dye into carbon dioxide and water, but it has the disadvantage of a long decolorization cycle, which generally takes several days; at the same time, most white rot fungi show higher efficiency in the low pH range ( Ali N, Ikramullah L G, et al., Decolorization of Acid red 151 by Aspergillus niger SA1 under different physicochemical conditions, World J Microbiol Biotechnol, 2008; Mazmanci MA, Unyayar A, Decolorization efficiency of Funalia trogii under static condition: Effect of C: N ratios, Afr J Biotechnol, 2010; Rismayani S, Fukushima M, et al., Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic acid, J Hazard Mater, 2004)

[0004]In previous studies, due to the rapid decolorization advantages of zero-valent iron, environmental researchers paid great attention to it, and blindly pursued the quickness of decolorization, while The changes in the treatment products and their possible impact on the environment are ignored; on the other hand, researchers who prefer to use white rot fungi for decolorization treatment pay more attention to the metabolic changes of dyes and pay more attention to the decolorization of dyes. Environmental protection, but less concerned about the quickness of treatment; at the same time, when the two methods are used alone, they need to maintain a low pH to achieve better treatment effects. In most cases, it is more convenient to use hydrochloric acid and the cost is not very high. Researchers often choose hydrochloric acid to reduce the pH of dye wastewater. So far, bio-organic acids with relatively slow release rates have not been used to reduce the pH of dye wastewater treatment systems.