Method for advanced treatment and reuse of printing and dyeing wastewater pre-processed by macroporous resin

A macroporous resin, printing and dyeing wastewater technology, applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., can solve problems such as resin blockage, resin work exchange capacity reduction, etc. The effect of saving investment and operating costs, prolonging the service life and regeneration cycle

Inactive Publication Date: 2014-10-15

NINGBO QINGSHUIYUAN WATER TECH

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However, the disadvantage of this invention is that the secondary effluent directly enters the resin, and the suspended matter in the waste...

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Abstract

The invention discloses a method for advanced treatment and reuse of printing and dyeing wastewater pre-processed by macroporous resin. The method comprises the following steps: taking the printing and dyeing wastewater for the secondary treatment; performing conducting Fenton reaction precipitation, ultra-filtrate membrane filtration, macroporous resin absorption and reverse osmosis membrane separation on discharged wastewater subjected to the treatment, wherein the output water of the reverse osmosis membrane is adopted as the high-quality water for recycling for enterprises, and the concentrated water of the reverse osmosis membrane is emitted on standard, or is emitted to a sewage plant through nano tubes for centralized processing. The method has the advantages that (1) the regular pre-processing technology and multi-media filtration procedure before the macroporous resin is eliminated, and the investment and operation cost is reduced; (2) the ultra-filtrate membrane filtration is adopted as the pre-processing of the macroporous resin, the input water quality is improved, pollutants, such as suspended solids, in water are greatly reduced, the service life and the regeneration period are prolonged, and the operation cost is lowered; (3) the macroporous resin absorption is added as the pre-processing of the reverse osmosis membrane on the basis of the ultra-filtration, the input water quality of the reverse osmosis membrane is improved, pollution is relieved, the service life and the cleaning period are prolonged, and the water output of the reverse osmosis membrane is improved.

Application Domain

Multistage water/sewage treatmentWaste water treatment from textile industry

Technology Topic

UltrafiltrationChemistry +13

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[0026] The present invention will be described in further detail below in conjunction with the embodiments of the drawings.

[0027] Such as figure 1 Shown is the flow chart of the present invention,

[0028] A method for advanced treatment and reuse of printing and dyeing wastewater using macroporous resin pretreatment, including the following steps:

[0029] Step 1. Fenton reaction: Take the secondary treatment effluent of printing and dyeing wastewater and add acid to adjust the PH value to 3 to 6, then perform Fenton reaction. After the Fenton reaction is completed, add alkali to adjust the pH to 7 to 8, and then add polyacrylamide. Perform coagulation and precipitation; the solubility of polyacrylamide is 1ppm to 10ppm. The Fenton reaction uses ferrous sulfate and hydrogen peroxide as the Fenton reaction agent, and the time of the Fenton reaction is controlled within 1 to 3 hours.

[0030] The above-mentioned printing and dyeing wastewater secondary treatment effluent refers to the wastewater that can be discharged up to the standard or reach the discharge of the nanotube after the conventional anaerobic, hydrolyzed, aerobic and other biological treatments, coagulation and sedimentation, and other physical and chemical treatments. The COD is generally below 200mg/L, and the chemical oxygen demand (COD) of a small part of the wastewater discharged from the nanotube is below 500mg/L.

[0031] Step 2. Ultrafiltration membrane filtration: take the supernatant after precipitation in step 1 and perform ultrafiltration membrane filtration to obtain ultrafiltration membrane effluent and ultrafiltration membrane concentrated water; the ultrafiltration membrane filtration uses ultrafiltration with a precision of 0.1 micron Membrane, the ultrafiltration membrane is in the form of immersion or external pressure, the water production rate of the ultrafiltration membrane is controlled at 90% to 95%, and the concentrated water of the remaining ultrafiltration membrane is mixed with the secondary treatment effluent for recycling treatment.

[0032] Step 3. Macroporous resin adsorption: the effluent of the ultrafiltration membrane obtained in step 2 enters the macroporous resin reactor mainly composed of macroporous resin for adsorption treatment, and the concentrated water of the ultrafiltration membrane is refluxed and mixed with the secondary treated effluent for recycling treatment. The macroporous resin is composed of a basic anionic macroporous resin and an acid cationic macroporous resin, and the mixing ratio of the basic anionic macroporous resin and the acid cationic macroporous resin is 1:5 to 5:1 by volume. When the adsorption of the macroporous resin is saturated, the regenerated solution of 2% to 4% sodium hydroxide and 2% to 6% of sodium chloride is used for regeneration treatment and then reused. The macroporous resin regenerated solution is returned to The wastewater treatment tank of the enterprise is recycled for secondary treatment.

[0033] Step 4: Reverse osmosis membrane separation: In step 3, the macroporous resin adsorbs the effluent into the reverse osmosis membrane separation system mainly composed of reverse osmosis membranes. The water produced by the reverse osmosis membrane is used as a high-quality water for enterprise recycling. The concentrated water is discharged up to the standard or discharged to the sewage plant for centralized treatment. The reverse osmosis membrane adopts a reverse osmosis membrane with a salt rejection rate of more than 99%, made of polyamide, and a controlled membrane separation water production rate of more than 60%.

[0034] In the advanced treatment and reuse method of printing and dyeing wastewater, the Fenton reaction process is adopted before the ultrafiltration membrane filtration; and the macroporous resin adsorption is located after the ultrafiltration membrane filtration and before the reverse osmosis membrane separation. Fenton’s reagent in Fenton’s reaction has strong oxidizing properties in the mixed solution of hydrogen peroxide and ferrous ions, and has a high ability to remove refractory organic pollutants. It can be applied to the treatment of printing and dyeing wastewater, which can effectively improve the wastewater. Processing power.

[0035] Practical application of this printing and dyeing wastewater advanced treatment and reuse method in a printing and dyeing enterprise:

[0036] The company discharges about 5,000 tons of printing and dyeing wastewater every day in the production process. After conventional anaerobic, hydrolytic, aerobic and other biological treatments, coagulation sedimentation and other physical and chemical treatments, the secondary treated effluent is discharged to a large sewage plant for treatment. The nanotube requires the COD of the effluent from the secondary treatment of printing and dyeing wastewater to be below 500mg/L. This method is actually applied in the printing and dyeing enterprise. Every day, 3000 tons of printing and dyeing wastewater secondary treatment effluent is used for resource recycling. The treatment process is as follows:

[0037] Step 1. Fenton reaction: take the effluent from the secondary treatment of printing and dyeing wastewater with a COD of 400-500mg/L, add 2000ppm of ferrous sulfate, add acid to adjust the pH value of the wastewater to 4, and then add 400ppm of hydrogen peroxide for Fenton reaction The reaction time is 1 hour. After the reaction is over, alkali is added to adjust the pH to 7, and 10 ppm of polyacrylamide is added for coagulation and precipitation.

[0038] Step 2. Ultrafiltration membrane filtration: Take the supernatant after coagulation and filter it with ultrafiltration membrane. The COD of the precipitation supernatant is 150-200mg/L, and the COD of the ultrafiltration membrane effluent is 140-190mg/L. The degree is 200-600 times.

[0039] Step 3. Macroporous resin adsorption: the effluent of the ultrafiltration membrane enters the macroporous resin reactor for adsorption treatment, and the concentrated water of the ultrafiltration membrane is mixed with the secondary treatment effluent for recycling treatment. The macroporous resin adopts basic anionic resin and acid cationic macroporous resin, which are mixed according to the volume ratio of 4:1. The COD of the water absorbed by the macroporous resin is 60-90mg/L, and the chroma is less than 100 times; When the resin is saturated with adsorption, it needs to be reused after regeneration treatment, and the macroporous resin regeneration liquid is returned to the enterprise wastewater conditioning tank for secondary treatment in a cycle. The regeneration cycle is about one week, and the regeneration solution adopts a mixed solution of 2% sodium hydroxide + 4% sodium chloride.

[0040] Step 4: Reverse osmosis membrane separation: The macroporous resin adsorbs the effluent water into the reverse osmosis membrane separation system. The water produced by the reverse osmosis membrane is used as a high-quality water for enterprise recycling. The concentrated water of the reverse osmosis membrane is discharged to the standard or discharged to the pipe Centralized treatment in the sewage plant. The COD of the water produced by reverse osmosis membrane separation is less than 20mg/L, and the color is less than 10 times.

[0041] In step three, the macroporous resin adsorbs the effluent water into the reverse osmosis membrane separation system mainly composed of reverse osmosis membranes. The water produced by the reverse osmosis membrane is used as a high-quality water for enterprise recycling. The concentrated water of the reverse osmosis membrane is discharged or taken into account. Discharge to the sewage plant for centralized treatment. The reverse osmosis membrane adopts a reverse osmosis membrane with a salt rejection rate of more than 99%, made of polyamide, and a controlled membrane separation water production rate of more than 60%.

[0042] In the early stage of the project, the macroporous resin treatment process was not used after the ultrafiltration membrane. A separate ultrafiltration membrane is combined with a reverse osmosis membrane. The cleaning cycle of the reverse osmosis membrane is about one week, and between the ultrafiltration membrane and the reverse osmosis membrane After adding the macroporous resin adsorption process, the cleaning cycle of the reverse osmosis membrane is extended to about one month, and the effect is very significant; the extension of the cleaning cycle of the reverse osmosis membrane reduces the processing cost.

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Low investment and operating costs
Improve water quality

Method for advanced treatment and reuse of printing and dyeing wastewater pre-processed by macroporous resin

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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