A variety of bleaching agent in dyeing wastewater treatment advantages and disadvantages - printing, wastewater treatment, bleaching agent - water

A variety of bleaching agent in dyeing wastewater treatment advantages and disadvantages - printing

, wastewater treatment, bleaching agent - water

Abstract: The complexity of dyeing wastewater composition, color and high, this in accordance with the marking methods (adsorption, flocculation) to analyze the mechanism of the bleaching agent bleaching, bleaching agents reviewed a variety of bleaching effect, summed up the advantages and disadvantages of various bleaching agents.

Keywords: Dyeing wastewater; decolorization; adsorption; flocculation

Recent years, Decolorization of dyeing wastewater is very active in dealing with the different methods can be divided into two categories, namely, biochemical and physicochemical methods. Physico-chemical methods including adsorption, coagulation, and in other biochemical methods, including activated sludge, rotating biological contactors, etc.. Actual water treatment works in a variety of methods are often combined in order to achieve the best results. This article will decolorization and Flocculation reviewed.

1 assay Adsorption method is used

Activated Carbon , Clay, porous material such as powder or granules mixed with water, or to waste water through its filter bed composed of granular materials to make dyes and other pollutants in waste water adsorbed on the surface of porous material be removed. One of the main advantages of decolorization by adsorption effect could be removed from the water dye, the dye adsorption process to retain the structure of [1].

1.1 activated carbon adsorbent Activated dye selective bleaching performance of its order of basic dyes, direct dyes, acid dyes and sulfur dyes [1]. Normally activated by the animal charcoal, charcoal, pitch-based carbon and other carbon-bearing material formed by high temperature carbonization and activation. Microporous activated carbon, medium and large enough hole, hydrophilic strong, limiting the hydrophobic dye molecules and the proliferation of suitable molecular weight of not more than 400 water-soluble dyes decolorization of dye molecules or hydrophobic effect of decolorization than poor [2]. Activated carbon can effectively remove waste water dyes, basic dyes, azo dyes. Under certain conditions, can be directly activated carbon adsorption of some heavy metal ions. In addition, water-soluble dyes when activated carbon adsorption, adsorption rate, but not adsorption of suspended solids (ss) and insoluble dyes. Although the adsorption properties of activated carbon fine, but regeneration difficulties, high cost, generally lower concentrations of dye used in wastewater treatment or advanced treatment. For SMEs, often need cheap, readily available raw materials, adsorbents for wastewater treatment [3].

1.2 mineral adsorbent Organic bentonite water treatment agent has rich raw materials, low cost and simple preparation method, the adsorption characteristics of good performance. At present, the new type of bentonite adsorbents in wastewater treatment studies have involved removal of heavy metals, organic pollutants, bleaching, dephosphorization, deodorant and other areas, and laboratory results have been obtained a good product . Bentonite is a montmorillonite clay as the main ingredient, montmorillonite is a 2:1 layered aluminosilicate, in layers with exchangeable calcium, magnesium, sodium and other ions, the surface of bentonite particles tend to exist negative charge and positive charge, negative charge also includes a constant negative charge and ph control the negative charge, the nature of the bentonite has good adsorption, ion exchange performance,

Dyeing Wastewater Treatment Gained a wide range of applications [4]. Zhao Dongyuan such as the use of natural montmorillonite with acidic cationic dye wastewater treatment, the study found more than 90% decolorization rate, cod removal rate as high as 96.9%, montmorillonite is the removal of pigments by adsorption mechanism and simple, period moderate, easy regeneration and low investment and so on [2].

Wang Qi congruent [5] studied the Stone on the water-soluble dye Direct Fast Scarlet 4bs adsorption. The results show that the Stone on the dye adsorption to better meet the langmuir equation, and the dye solution and the actual bearing wastewater decolorization rate and cod removal. China medical stone is rich in resources, open up medical stone Biosorption technology and broad prospects.

Qiuzu Nan et al [6] studied the use of attapulgite powder as adsorbent to remove wastewater, decolorization obvious effect on the cationic and reactive dyes decolorization notable. It is noteworthy that the decolorization mechanism of minerals in addition to adsorption, but also has the flocculation and ion exchange integrated

Cooperation Use. 1.3 coal, slag adsorbents

Coal slag as industrial waste, with more porous, surface area characteristics of large molecular weight of the dyeing wastewater, non-polar dyes and additives and so has a good adsorption, when the coal micropores and adsorbed The more material the size of the particle diameter is similar to the adsorption effect is better. Nanning Silk and Linen

Textile Dye used for decolorization of dyeing wastewater by coal, the coal used in the gap rate of 72.8%, the coal of different types of dye decolorization rate of between 62.5% and 99.5% used. Cinder is without regeneration, without the cost of the adsorption material, composed of single and multiple dyes of various printing and dyeing wastewater treatment has good results, the decolorization rate is generally greater than 96%.

Decolorization with fly ash as adsorbent, its investment and operating costs significantly less than the activated carbon, therefore, economically more reasonable. MIANYANG net results showed that the fly ash on the reactive dye and reactive red x.8b x.3b good bleaching effect.

Activated coal is low quality coal as raw material, crushing, screening, dipping, vaccination and other technology made a new type of high-quality water treatment

Filter Media . It has a large internal surface area, mesoporous more developed, it is beneficial for the adsorption of large organic molecules. GUO et al [9] Treatment of dyeing wastewater by activated coal results show that activation of coal as the effect of dyeing wastewater tertiary treatment is obvious. Removal rate basically stable at: cod removal rate of greater than 80%, the decolorization rate of more than 70%. The method of investment is low (lower than the activated carbon 40%), small footprint, simple operation, easy to manage, stable treatment effect for treatment of wastewater has opened up a cost-effective way.

1.4 Synthesis of inorganic adsorbents

Containing silica mixed oxides and the activity of mgo can be used to handle wastewater, and with heat regeneration. By mg (oh) Adsorption of anionic dye wastewater showed good decolorization, the decolorization is the use of magnesium plus generate positively charged alkali mg (oh) 2 precipitation, strong adsorption of negatively charged anion dyes Ershi wastewater decolorization, Xu Kun et al [10] studies have shown, mg (oh) 2 anions decolorization rate as high as 99% ~ 100%, mg (oh) 2 adsorption storage time should not be too long, otherwise the potential impact of bleaching effect desorption .

1.5 Ion exchange resins Adsorbent Recent years, for water-soluble ionic dye wastewater difficult issue, for the use of sulfonated coal and cellulose ion exchange resin decolorization studies.

Sulphonated coal is a new type of ion exchange water treatment agent, is a low quality coal (eg lignite) after sulfuric acid

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