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Combined treating process for waste water of basic printing and dyeing

A technology for printing and dyeing wastewater and composite treatment, which is used in textile industry wastewater treatment, neutralization water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. and other problems to achieve the effect of reducing dosage, improving quality and preventing toxicity

Inactive Publication Date: 2006-06-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used in the treatment of alkaline printing and dyeing wastewater, there are disadvantages such as a large amount of magnesium salt used, a large amount of sludge, and small alum flowers, which limit its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1000ml of a neutral printing and dyeing wastewater, chromaticity 800 times, adding calcium oxide to adjust pH = 12, adding MgSO containing 0.1g magnesium 4 .7H 2 O with FeSO containing 0.8 g Fe 4 .7H 2 O for flocculation, while adding 0.5mg / L polyacrylamide solution, after flocculation, measure the color of the supernatant, the decolorization rate is 85%.

Embodiment 2

[0015] pH>10 printing and dyeing wastewater 1000ml, chroma 800 times, add MgCl containing 0.4g magnesium 2 .6H 2 O with FeSO containing 0.2 g Fe 4 .7H 2 O for flocculation, after flocculation, measure the color of the supernatant, the decolorization rate is 92%.

Embodiment 3

[0017] 1000ml of printing and dyeing wastewater with a pH>12 and a chroma of 800 times, add a brine solution containing 1 gram of magnesium and FeCl containing 0.04 grams of iron 2 .6H 2 O for flocculation, while adding 0.1mg / L polyacrylamide solution, after flocculation, measure the color of the supernatant, the decolorization rate is 90%.

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PUM

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Abstract

A process for treating the alkaline printing-dyeing sewage features that the inorganic Mg salt and inorganic ferrous salt are proportionally added to said sewage for flocculating reaction.

Description

technical field [0001] The invention relates to a composite treatment method for alkaline printing and dyeing wastewater, in particular to a method for compositely treating alkaline printing and dyeing wastewater by using magnesium salt and ferrous salt. It belongs to the technical field of waste water treatment. Background technique [0002] Printing and dyeing wastewater is one of the main harmful wastewater in my country, which seriously pollutes the water environment. Printing and dyeing wastewater is characterized by a large volume and wide area, complex components, and deep color. It mainly contains printing and dyeing, dyeing auxiliaries, size, fiber impurities, and inorganic salts, among which the pollution of printing and dyeing is the most serious. Conventional treatment methods include chemical coagulation, biochemical, electrochemical coagulation and activated carbon method. Due to the simple process and low cost of chemical coagulation, it is widely used, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/66C02F103/30
Inventor 周保学刘军深姜述芹宋文芹
Owner SHANGHAI JIAO TONG UNIV
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