Method for preparing printing dye adsorbent by taking eggshells as matrix and treatment method

Abstract

The invention relates to a method for preparing a printing dye adsorbent by taking eggshells as a matrix and a treatment method. The method comprises the following steps of: crushing the pretreated eggshells, treating by using a diluted alkali NaOH or KOH solution for 2 hours, cleaning by using clear water to remove alkali liquor, and drying at the temperature of 80 DEG C for 2 to 5 hours to obtain eggshell powder; and putting the eggshell powder, sodium silicate and aluminum sulfate in a mixer and mixing to obtain a mixture, regulating the pH value of the mixture, putting the mixture in a drying oven and drying at the temperature of between 100 and 1,000 DEG C for 2 to 5 hours, cooling and crushing to obtain a treating agent for printing and dyeing wastewater. According to the treatment method, the addition amount of the printing dye adsorbent is 0.5 to 5 g / L, and the printing and dyeing wastewater is treated by the printing dye adsorbent at the temperature of between 10 and 40 DEG Cfor over 20 minutes. According to the method, the discarded eggshells are taken as main raw materials, so the production cost is low; a heating activating treatment process is adopted, the process issimple and controllable, and waste gas, wastewater and industrial residues are not discharged in the production process; and water-soluble dyes in the printing and dyeing wastewater are adsorbed fully under the adsorption action of the discarded eggshells, the addition amount is little, the decoloration rate of alkaline dyes is over 90 percent, and the decoloration rate of direct dyes is over 80 percent, so that the chroma of the wastewater is reduced effectively, and water quality is improved.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing sewage treatment adsorbents, and in particular relates to a method for preparing printing and dyeing sewage adsorbents using eggshells as a substrate and a method for treating printing and dyeing sewage. Background technique [0002] Dyes have been widely used in papermaking, plastics, leather, rubber, coatings, inks, cosmetics, photosensitive materials and other fields. The widespread use of dyes produces a large amount of dye wastewater discharged into environmental waters, resulting in the pollution of natural waters. Traditional dye wastewater treatment methods include coagulation and flocculation, oxidation or ozonation, membrane separation and activated carbon adsorption, etc., but these technologies have not shown the advantages of high efficiency and low cost. Activated carbon is currently the most widely used dye adsorbent, but its relatively high price, high operating costs,...

AI Technical Summary

Problems solved by technology

In the research of Wen-Tien Tsai et al., put a certain amount of eggshell into the acidic 51 solution, after half an hour, its adsorption capacity will reach more than 50%, but in their research, it is not that the eggshell is to all Pigments and dyes have good adsorption effect, which has a specific relationship with the size of the molecular weight of the pigment and the functional groups of the molecule.

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