Treatment method of active black dye wastewater
A dye wastewater, reactive black technology, applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of low COD removal rate and poor decolorization effect, and reduce the cost of wastewater treatment. , the effect of broad application prospects
Inactive Publication Date: 2014-01-22
SHAANXI SHENGMAI PETROLEUM
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AI Technical Summary
Problems solved by technology
[0003] Good, but poor decolorization effect on water-soluble dyes containing azo bonds and multiple sulfonic acid groups, such as acidic and reactive dyes
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0008] Take 100 mL of reactive black dye wastewater, add NaOH to adjust the pH to 13, add 0.2 g CaO powder under magnetic stirring, wait until it is completely dissolved and dispersed evenly, then add 0.12 g MgSO 4 ·7H 2 0, after stirring for 30 minutes, let it stand until the solution is separated, take the supernatant, measure its absorbance at 600 nm on a UV spectrophotometer, calculate the decolorization rate according to the change of absorbance, and measure the COD of the solution with the potassium dichromate method , and calculate the COD removal rate according to the change of COD.
[0009] The measured decolorization rate was 99.3%, and the COD removal rate was 95.1%.
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Abstract
The invention relates to a wastewater treatment method, and discloses a treatment method of active black dye wastewater. The treatment method comprises the following steps: first adjusting the active black dye wastewater to be alkaline, then adding 0.6-2.0g / L of CaO powder with stirring, adding 1.2g / L of MgSO4.7H2O after the CaO powder is fully dissolved and dispersed evenly, stirring for a certain time, standing for solution layering, and then taking a supernatant. By using the treatment method, the wastewater decolorization rate reaches 99%, the COD removal rate reaches 95%, COD is reduced to less than 25mg / L, and meets first-class water quality requirements of the '' national integrated wastewater discharge standard''. The raw materials of CaO and MgSO4.7H20 are cheap and easy to get, so that the wastewater treatment cost is reduced greatly, and the treatment method has broad application prospects in industrial wastewater treatment.
Description
technical field [0001] The invention relates to a method for treating waste water. Background technique [0002] The wastewater treatment of the printing and dyeing industry has always been a hot issue in the wastewater treatment of the chemical industry. Among the many dye wastewater decolorization treatment methods, the flocculation method is widely used because of its low investment cost, small equipment occupation, large treatment capacity and high decolorization rate. Commonly used flocculants include ferrous sulfate, ferric chloride, aluminum sulfate, polyaluminum chloride (PAC) and polyferric sulfate (PES). Decolorization effect of aluminum salt and iron salt flocculant on hydrophobic dyes [0003] Better, but less effective in decolorizing water-soluble dyes containing azo bonds and multiple sulfonic acid groups, such as acidic and reactive dyes. Zhang Xianqiu et al. studied the treatment of printing and dyeing wastewater with magnesium-iron composite floccula...
Claims
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IPC IPC(8): C02F9/04C02F103/30
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM