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Method for treating dye wastewater
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A technology for dye wastewater and wastewater, which is applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc. , No secondary pollution, simple treatment process
Inactive Publication Date: 2014-01-29
HANGZHOU DIANZI UNIV
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Problems solved by technology
Activated carbon is used as an adsorption material for the decolorization of dye wastewater. It has the advantages of large adsorption capacity due to its porosity and large specific surface area; Adsorption, the main function of macropores and micropores is to provide a pathway for the adsorbate to enter the adsorption site, so leakage suction often occurs.
In addition, activated carbon is expensive, difficult to regenerate, low in strength, easy to pulverize, and will cause secondary pollution
Various other treatment technologies have also been tried or applied in dye wastewater treatment projects, but they have not been widely used due to unsatisfactory effects or high costs.
Method used
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Embodiment 1
[0014] Step 1: Adjust the pH of acid red B wastewater to 6 to obtain treated wastewater;
[0015] Step 2: Flow the treated wastewater at a speed of 5L / h through a 10L adsorption column filled with medicament, and cyclically treat it for 1h; the COD removal rate in the wastewater reaches 95%, and the color removal rate reaches 95%;
[0016] Step 3: After the medicament in the adsorption column reaches saturation adsorption, take it out, and use air flotation filtration to separate acid red B.
[0017] The medicament is made by grinding calcite after high-temperature roasting at 800°C for 6 hours, with an average particle size of 300nm; the used medicament can be reused after being roasted at 300°C for 300 minutes.
Embodiment 2
[0019] Step 1: Adjust the pH of acid scarlet GR wastewater to 2 to obtain treated wastewater;
[0020] Step 2: Flow the treated wastewater at a speed of 300L / h through a 10L adsorption column filled with medicament, and cyclically treat it for 5 hours; the COD removal rate in the wastewater reaches 80%, and the color removal rate reaches 85%;
[0021] Step 3: After the agent in the adsorption column reaches saturation adsorption, it is taken out, and the acid scarlet GR is separated by air flotation filtration.
[0022] The medicament is made by grinding calcite after high-temperature roasting at 1200°C for 2 hours, with an average particle size of 10nm; the used medicament can be reused after being roasted at 600°C for 30 minutes.
Embodiment 3
[0024] Step 1: Adjust the pH of acid yellow G wastewater to 3 to obtain treated wastewater;
[0025] Step 2: Flow the treated wastewater at a speed of 200L / h through a 20L adsorption column filled with medicament, and cyclically treat it for 2 hours; the COD removal rate in the wastewater reaches 80%, and the color removal rate reaches 90%;
[0026] Step 3: After the medicament in the adsorption column reaches saturation adsorption, take it out, and use air flotation filtration to separate acid yellow G.
[0027] The medicament is made by grinding dolomite after high temperature roasting at 800°C for 6 hours, with an average particle size of 300 nm; the used medicament can be reused after roasting at 400°C for 240 minutes.
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Abstract
The invention discloses a method for treating dye wastewater. The method comprises the following steps of: (1) regulating the pH value of the dye wastewater to be 2 to 6; (2) controlling the wastewater to flow through an adsorption column which is filled with an agent at the speed of 0.5 to 30 times of the volume of the adsorption column / hour, and treating circularly for 1 to 5 hours, so that the chemical oxygen demand (COD) removal rate of the dye wastewater is 80 to 95 percent, and the removal rate of chroma is 85 to 95 percent; and (3) extracting the agent after the agent in the adsorption column is saturated, filtering and separating a dye out by air floating, and roasting the agent for recycling. By the method, the defects of complex process, high treatment cost, large mud production amount and the like in the conventional treatment technology are overcome; and the method is reliable and stable in running and good in effluent effect and has high environmental and economic benefits, and the dye can also be recycled while the wastewater is treated.
Description
Technical field [0001] The invention relates to the field of industrial wastewater treatment and resource utilization, in particular to a method for treating dye wastewater. Background technique [0002] my country is a big country in the textile industry, and the total printing and dyeing industry ranks first in the world. Dye wastewater is not only large in water, but also complex in composition, with deep color, COD and BOD 5 It has high content and contains a variety of biologically toxic and difficult-to-degrade substances with poor biodegradability; dyes in wastewater can absorb light, reduce water transparency, consume a large amount of oxygen in the water body, cause water hypoxia, and destroy the water body's self-purification ability. It is a type of organic wastewater that is currently difficult to treat. [0003] The current treatment methods of dye wastewater mainly include coagulation, adsorption, membrane separation, ozone oxidation and photocatalysis. The most com...
Claims
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Application Information
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