CN1978337A

CN1978337A - Printing-dyeing waste water treatment process

Info

Publication number: CN1978337A
Application number: CN 200510101734
Authority: CN
Inventors: 曹健
Original assignee: Zhu Rongxiang
Current assignee: Zhu Rongxiang
Priority date: 2005-12-01
Filing date: 2005-12-01
Publication date: 2007-06-13
Anticipated expiration: 2025-12-01
Also published as: CN100457654C

Abstract

This invention provides a process technology for waste water of printing and dyeing characterizing in including the following steps: a, adjusting pH value, b, primary filtration, c, decolor and flocculation, d, secondary filtration, e, de-water and oxidation. This invention is formed on the basis of chemical flocculation, filtration, oxidation of ozone and optical catalyzed oxidation and their related equipments, in which, processed water can reach the standard and satisfies the requirement of returned water in production.

Description

Printing-dyeing waste water treatment process

Technical field

The present invention relates to a kind of Technology that adopts physical chemistry method degrading high concentration dyeing waste water.

Background technology

Can produce high pollution waste water in the textile printing and dyeing production process, pollution indexs such as the colourity of this waste water, concentration of suspension, COD chemical oxygen demand (COD), BOD biochemical oxygen demand (BOD) are all very high, and because the water yield of waste water and water quality are unfixing, difficult processing.Usually biochemical method is adopted in the processing of dyeing waste water, but often treatment effect is undesirable in actual moving process.Its major cause is because painted kind changes, cause the change of component of the waste water of discharging bigger, the water yield of waste water also has bigger variation, more there is the additive that adopts in some production technique to be unfavorable for the growth of biological respinse bacterial classification, so adopt bioremediation to be difficult to accomplish complete qualified discharge.Other adopted biochemical methods often because treatment technology is single, can't resolve the contradiction between treatment effect and the processing cost.Therefore the comprehensive treating process of dyeing waste water still is a more scabrous problem in actual applications.

Summary of the invention

The purpose of this invention is to provide a kind of effectively printing-dyeing waste water treatment process, to overcome the deficiencies in the prior art.

To achieve these goals, the technical solution used in the present invention is a kind of printing-dyeing waste water treatment process, it is characterized in that comprising the steps:

A, adjusting pH value are introduced the equalizing tank buffering with the sewage that the printing and dyeing production plant is discharged, and to equalizing tank adding acid solution or alkali lye the potential of hydrogen of sewage are regulated, and the pH value of the sewage in the equalizing tank is stabilized between 6 to 9;

B, one-level are filtered, and add flocculating aids in the sewage after pH value is stable, filter behind sewage flocculation, and wherein most suspended substances is removed, and only stays fine suspension and solute that filtrate is mainly contained color;

The oxidative decoloration agent is adopted in c, decolouring flocculation, makes to be dissolved in to filter pigment oxidative decoloration in the sewage of back, adopts flocculation agent that these oxide compounds are condensed into bigger full-blown flowers then, is convenient to follow-up cascade filtration;

D, cascade filtration make the full-blown flowers that flocculate separate with filtrate, because of after twice flocculation, substantially suspended substance and product dyed thereby are thoroughly separated in water;

E, dehydration and oxidation, the deslagging after twice filtration is dehydrated into dewatered sludge through sludge dewatering equipment, burns or other harmless treatment, and still below standard water enters the oxidizing reaction pond after filtering for the second time, carries out ozone and ultraviolet catalyzed oxidizing reaction therein;

More excellent, the catalyzer that the infrared rays catalytic oxidation among the above-mentioned steps e adopts is MnO, TiO ₂Deng metal oxide;

And the ozone of the ozone oxidation reaction among the step e is to be produced by ozonizer, and with ozone with gas-liquid mixing pump or ejector and water thorough mixing;

And, before water outlet, adopt adsorbent absorption such as gac, to guarantee effluent quality;

And, being stabilized in 6 to 7 after regulating between, the pH value in step a is optimum.

The present invention is by comprehensively forming on processing methodes such as chemical flocculation, filtration, ozone oxidation, photochemical catalytic oxidation and the relevant device basis thereof, the not only easy qualified discharge of water quality after the processing, and can satisfy the requirement of producing reuse water, provide a cover low cost, high-level efficiency, stable solution route to treatment of dyeing wastewater.

Description of drawings

Fig. 1 is an art breading schema of the present invention;

State 2 is a kind of concrete embodiments of the present invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is done a detailed description,

Embodiments of the invention are shown in Figure 2.The pH value of sewage is 10 before handling, COD is 1840, BOD is 420.0, the SS suspended substance is 479.0, colourity is 1000, sewage is annotated philtrum and equalizing tank 1, acid base concentration deflection according to pH value detector 13, add suitable acid solution 11 toward equalizing tank 1, the pH value of sewage in the equalizing tank 1 is between 6 to 7; Like this, not only sewage that can the be pending discharge value that tentatively is near the mark more can be to make the effecting reaction pH value that will reach flocculating aids, and the flocculating aids consumption of use is minimum.

Fully reaction, when PH is stabilized in 6 to 7 scope, with sewage by entering in the grade one filter 2 through line mixer 21, because of the form of colourity a large amount of in the dyeing and printing sewage with suspended substance occurs, so need in line mixer 21, to add flocculating aids 22, to its pressurization, flocculating aids 22 is mixed with sump pump 23 in sewage through abundant; At this moment, the thick suspended substance of part in the flocculation sewage after behind the strainer 2, wherein most suspended substances leach, is sent to via sludge pipe and blocks in the dirty slag remover 4, and remaining filtrate is mainly contained the fine suspension and the solute of color.

Before entering the cascade filtration program, the one-level filtered sewage is added an amount of oxidative decoloration agent 31 earlier in reactive tank 3, through fully mixed, make and filters contained pigment and discoloring agent oxidation in the sewage of back; Question response fully after, add coagulant aidss 32 toward reactive tank 3, with instrument it is fully stirred mixedly, add flocculation agent 33, at this moment that the volume that flocculates is bigger full-blown flowers toward reactive tank again; After simply block the cascade filtration of dirty slag remover 4, pigment in the sewage is become deslagging fully discharge and the one-level deslagging is transported in the storage mud groove 41 at sludge pipe, the filtrate of this moment has been removed foreign material and variegated.

The deslagging that I and II filters out is transported to deslagging in the sludge dewatering equipment 5 by mud lift pump 52 earlier, adds an amount of dehydration flocculation agent 51, and press dewatering becomes the mud cake harmless treatment again.

The COD of the filtrate that goes out through cascade filtration is 532, BOD is 202.0, the SS suspended substance is 142.0, colourity is 50, filtrate is sent in the circulatory pool 6, by gas-liquid mixing pump 62, the filtrate that ozonizer 63 ozone that produces and cascade filtration are gone out is fully mixed, adds an amount of MnO, TiO ₂Deng metal oxide as catalyzer; With the filtrate that ultraviolet catalytic oxidation reactor 61 goes out cascade filtration, dysoxidizable molecular structure is opened, make it become the molecularity of easy oxidative degradation; Under the effect of ozone, decompose rapidly, the organism in the sewage is degraded fast, use gas-liquid mixing pump 62, can reduce the usage quantity of ozone, simultaneously the reaction efficiency of Ti Gaoing; Behind the abundant catalyzed oxidation of certain hour, the COD of filtrate is 65 to filtrate in circulatory pool 6, BOD is 18, SS is 54, colourity is 48.

For guaranteeing discharge water up to standard, can filter through the charcoal absorption of activated charcoal filter 7 again, the discharge water of gained can reach that COD is 22, BOD is 5.2, SS is 2.0, colourity is 10.

Claims

1, a kind of printing-dyeing waste water treatment process is characterized in that comprising the steps:

B, one-level are filtered, and add flocculating aids in the sewage after pH value is stable, filter behind sewage flocculation, and wherein most suspended substances is removed, and remaining filtrate is mainly contained the fine suspension and the solute of color;

D, cascade filtration will contain the pigment flocculation material and filter;

E, dehydration and oxidation, the deslagging after twice filtration is dehydrated into dewatered sludge through sludge dewatering equipment, burns or other harmless treatment, and still below standard water enters the oxidizing reaction circulatory pool after filtering for the second time, carries out ozone and ultraviolet catalyzed oxidizing reaction therein.

2, printing-dyeing waste water treatment process according to claim 1 is characterized in that the catalyzer that the infrared rays catalytic oxidation among the step e adopts is MnO, TiO ₂Deng metal oxide.

3, printing-dyeing waste water treatment process according to claim 1, the ozone that it is characterized in that the ozone oxidation reaction among the step e are to be produced by ozonizer, and with ozone with gas-liquid mixing pump or ejector and water thorough mixing.

4, printing-dyeing waste water treatment process according to claim 1, it is characterized in that step e finishes after, before water outlet, adopt adsorbent absorption such as gac, to guarantee effluent quality.

5,, it is characterized in that the pH value among the step a is optimum between being stabilized in 6 to 7 after the adjusting according to any described printing-dyeing waste water treatment process of claim 1 to 4.