CN1247166A - Biological treatment process and unit for wate water containing dye in textile and leather industry - Google Patents
Biological treatment process and unit for wate water containing dye in textile and leather industry Download PDFInfo
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- CN1247166A CN1247166A CN 98123458 CN98123458A CN1247166A CN 1247166 A CN1247166 A CN 1247166A CN 98123458 CN98123458 CN 98123458 CN 98123458 A CN98123458 A CN 98123458A CN 1247166 A CN1247166 A CN 1247166A
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Abstract
A biotreating process and equipment for the waste water containing dye from textile and leather industries includes passing the sewage into anaerobic initial stage with negative redox potential, staying in the stage for the shortest time, passing it into both anaerobic and aerobic activating stage where active slurry is cultured under the unit volume load higher than 1.0 KgBOD (cumxd) and 0-180 mv of positive redox potential, precipitation, returning part of active slurry back to initial stage, returning another part of active slurry back to activating stage, and thickening and then discharging the rest. The nutrients are added in the initial stage and/or activating stage. Said process is suitable for treating the sewage containing zo dye and sulfur dye.
Description
The present invention relates to textile industry and leather industry waste water containing dye, specifically is a kind of bioremediation that contains azoic dyestuff and sulphur waste water from dyestuff, also relates to the wastewater treatment equipment that is applicable to this method of enforcement.
Change has taken place in the degree of concern to environment in recent years, and has caused the wastewater treatment rules that variation has taken place thus.These change and all to require significantly to reduce pollutants in waste water matter, for example from fabric auxiliary agent, halohydrocarbon and the dyestuff etc. of textile industry and leather industry.
In order to handle the waste water that these contain dyestuff, in fact be to use chemistry up to now entirely with the treatment process of physics.If suitable, these treatment processs can be used in combination with aerobic biological method.
It is known that numerous chemical treatment methods are arranged.Generally, suggestion adding iron (II valency) and lime reduce.In this case, dyestuff is removed by reduction reaction.The oxygen level of waste water must be low, so that suppress ferrous iron to ferric competitive oxidation process.Because can form the ironic hydroxide mud that contains adsorpting dye molecule.This mud must take out in another wastewater treatment stage and abandon.And then processing waste water, excessive iron must be removed in the waste water in this treating processes, just can be introduced into the water body (Buschmann/Schollmeyer of reception then, Moglichkeiten zur Teilstromentsorgung ... [Possibilities for partial stream disposal..] inKorrespondenz Abwasser, Issue 2/93, Volumn 40, and pp.208-214 is referring to p.210).
Another kind of known chemical method is by under the condition greater than the 200mV redox potential, uses air, ozone or Fenton reagent to make dyestuff generation oxidation destroy (this paper quotes).
Can also use instead or add the physics method of using.Commonly used is ultrafiltration or charcoal absorption or brown coal powder absorption.Waste water behind this spline filter carries out oxide treatment (ATV-Arbeitsberichte with the thing generation method subsequently, Abwasser derTextilindustrie[ATV working reports, textile industry wastewaters] in KorrespondenzAbwasser, Issue 9/89, Volume 36, pp.1074-1084 is referring to p.1083).Yet, except higher equipment requirements, only need import very high energy with the oxide treatment dispose of wastewater.
In addition, attempted handling the waste water of textile industry with method of evaporation.Yet, still stayed liquefied concentrate to be disposed.In addition, the shortcoming of such treatment unit is the cost of investment height, energy consumption big (with above-listed document).
Except cause because of substance and/or equipment requirements expensive, the efficient of all known means all can not be satisfactory.Because still have residual dye in waste water, it is impossible therefore reusing waste water in circulation technology.
The bioremediation of the further employing that people know already begins with the oxidation of activated sludge in the stage mostly.Yet the residence time required in containing the activated sludge device is unrealisticly high.In addition, the efficient that can reach can not satisfactory (the same document, the 1082nd page).
The two-stage bio-reaction system also is known, it constitutes (Glasser by anaerobic stages and aerobic stage, Liebelt, Hempel, Anaerob-Aerob biologischer Abbau vonFarbstoff ... [Anaerobic/aerobic biodegradation of dye ... ] in 1.Colloquium Produktionsin tegrierter Umweltschutz, published by GVC-VDI-Society for Process Engineeringand Chemical Engineering-and IUV-Institue for Environmental Engineering-University of Bremen, 1993, pp.293-303).But needed degradation time is still long when this method of industrial application, and accessible efficient is also low excessively.
According to present viewpoint, some dyestuff be may be not biodegradable (Buschmann/Schollmeyer, this paper quotes, p.210).
The purpose of this invention is to provide a kind of method of wastewater treatment and device, the waste water containing dye in order to biological treatment textile industry and leather industry is suitable for industrial application.
According to the present invention, this purpose realizes by following manner:
-the waste water that will contain dyestuff is sent into anaerobism starting stage with negative redox potential (first treatment stage),
-after the anaerobism starting stage stops short residence time(SRT) (this depends on the type of dyestuff), waste water fed amphimicrobian or aerobic activation stage (second treatment stage) when waste water, in this stage, activated sludge is greater than 1.0kg BOD/ (m
3Cultivate under * unit volume load (every cubic metre of waste water required biological oxygen demand every day) d) and the positive redox potential condition of 0-180mV,
-after precipitation, the part of activated sludge is returned activation stage, part is returned the anaerobism starting stage, and all the other are removed after thickening,
-nutrient is added waste water in starting stage and/or the activation stage, and keep negative redox potential in the starting stage,
-will import the aerobic secondary treatment stage from the waste water that activation stage comes out (the 3rd treatment stage),
-subsequently, the discharge of wastewater handled to receiving in the water body, is perhaps used separately.
Microorganism by in the starting stage (fs) of aerobic/anaerobic, adopt being fit to (this microorganism produces at the activation stage of operating under high loading, amphimicrobian or the aerobic condition (second treatment stage)), just can make the compound reduction that under aerobic condition, is difficult to degrade or can not aerobic degradation, wherein even comprise AOX (halohydrocarbon).AOX can be by subsequently bio-oxidation (the 3rd treatment stage) and finally remove effectively with residual waste water component.In addition, because the effect of concrete bacterium of using, with respect to present known biological process, the speed of degradation process has been brought up to higher degree.
This method can be carried out under the situation of using considerably less energy efficiently.
Activated sludge can precipitate in the precipitate phase of opening in a minute, also can be kept in amphimicrobian or aerobic activation stage (second treatment stage).
In the method, to the redox potential continuously measured of anaerobism in the starting stage, and by special aeration and/or Control Circulation activated sludge speed to the anaerobism starting stage, with this oxidation reduction potential control between 0 to-550mV, preferably≤350mV.
In the method, also nitrogenous and phosphatic nutrient can be added in the waste water that contains dyestuff.
Sanitary wastewater and other waste water (they are normally produced in this class industrial production) can be used as nutrient equally, as other waste water from the human or animal.These waste water should mix with the waste water that contains dyestuff mutually by activated sludge, and anaerobism starting stage and amphimicrobian or aerobic activation stage are returned in this activated sludge recirculation then.
Preferably, the treating water that produces in the excessive activated sludge process of thickening is back to the anaerobism starting stage.
The waste gas that produces in the anaerobism pretreatment stage can be used as the oxygen carrier of aerobic secondary treatment in the stage.Therefore, also the gas sampling that anaerobism was produced in the starting stage is delivered to the aerobic secondary treatment stage.
The wastewater treatment equipment of the present invention that is used for this method comprises: carry out activated sludge jar, setting tank and the aerobic secondary treatment stage of amphimicrobian or aerobic treatment, they all are installed in the downstream of the pre-treatment jar of work under the anaerobic environment; And the pipeline of activated sludge being led back activated sludge jar and pre-treatment jar is installed on setting tank, and the pipeline that activated sludge is directed at the sludge treatment device.
Except that setting tank is arranged, a system that keeps mud can be installed in the activated sludge jar; Perhaps keep the mud system and replace setting tank with this.
Wastewater treatment equipment also should have following structure: in activated sludge being led go back to the pipeline way of activated sludge jar and pre-treatment jar, a dusting cover system is installed.
In order to maintain operation condition required in each container, pre-treatment jar, activated sludge jar and aerobic secondary treatment stage all are equipped with the device of control air or oxygen feeding.
For identical purpose, preferably, pre-treatment jar, activated sludge jar and aerobic secondary treatment stage all also are equipped with the device of control sludge recycle speed.
If the waste gas that produces in the anaerobism pretreatment stage is used as oxygen carrier, the pre-treatment jar just is equipped with the device of accepting waste gas and waste gas being transferred to the aerobic secondary treatment stage so.
If sanitary wastewater or other waste water add as nutrient, they should add by leading the pipeline of getting back to activated sludge jar and pre-treatment jar so.
In addition, can a pipeline that lead to the pre-treatment jar from the sludge treatment device be installed for the treating water that produces.
In the processing of aerobic secondary treatment in the stage, can in a known way in trickling filter, activated sludge device, fixed-bed reactor or pond system, under the condition of bubbling air oxygen or pure oxygen, carry out.
In conjunction with an illustrative embodiment present method is described in more detail below.Its relevant accompanying drawing has shown the schema according to the wastewater treatment equipment of the inventive method running.
Waste water containing dye from textile finishing or leather processing factory at first feeds pre-treatment jar 1.This pre-treatment jar effect at first is to mix and surge tank as one.Mixing and surge tank under any circumstance all are essential, because the generation of waste water is inhomogeneous, and the character of waste water is also inhomogeneous.The size of pre-treatment jar 1 depends on the type and the quantity of waste water, and its selection should guarantee at least 6 hours the residence time as far as possible.
What link to each other with pre-treatment jar 1 is biological activity mud jar 2 high loading, that maintain running under amphimicrobian or the aerobic condition.The load of its unit volume is at least 1.0kg BOD/ (m
3* d) (every cubic metre of waste water required biological oxygen demand every day).There is nutrient, when especially having phosphorus, nitrogen and trace element (in the present embodiment, they have been added in the pre-treatment jar 1), can under the condition of minimum oxygen supply, cultivating the amphimicrobian bacterial strain.The pH that also can add lime control waste water in this method.Mixed solution through after certain residence time, promptly flows into setting tank 3 in activated sludge jar 2, in this jar, activated sludge is pumped out.Its part is circulated in activated sludge jar 2 and the pre-treatment jar 1 after dusting cover system 4 filters, and flows into this ratio of two jars respectively and is about 2/3 (activated sludge jar 2) than 1/3 (pre-treatment jar 1).Remaining mud is then delivered to sludge treatment device 6, discards through thickening processing or taking-up in this device.
In pre-treatment jar 1, by cultured microorganism with keep anaerobic environment and produce＜redox potential of 0mV, make with after the waste water that contains dyestuff contacts the enough time, just begin the anaerobic digestion (reduction) of dyestuff.Activated sludge from the activating apparatus that operates under the high loading amphimicrobian condition demonstrates very high oxygen consumption, so the degraded of material is carried out quite soon in the textile waste, and the redox potential in the pre-treatment jar 1 can be reduced to-600mV.Therefore, in pre-treatment jar 1, measure its redox potential, and by the introducing of controlled aeration or mud redox potential is set in-50mV is between-the 500mV, preferably be lower than-350mV, at this moment, by air oxygen being introduced pre-treatment jar 1 and anaerobism/reduction activation device (activated sludge jar 2), and make the microorganism of participation effect have vigor.
Decolouring depends primarily on the content of dry-matter in the pre-treatment jar 1.Under common solids concn, dry matter content should be greater than 1 grams per liter.
In addition, the condition in advance of microorganism growth is the nutrient supply abundance, and for example the nutrient form that can be used as phosphorous or nitrogenous fertilizer is added in the pre-treatment jar 1, as shown in drawings.Yet nutrient also can be added in the activated sludge jar 2.Because in this factory, also can produce other waste water,, these other waste water add so also can be used as nutrient from for example living quarters.Favourable way is that sanitary wastewater is joined in the activated sludge of supply, and then by dusting cover system 4, sanitary wastewater can filter simultaneously like this.
After reduction, component residual in the waste water can be removed through aerobic secondary biological treatment.Therefore, waste water then enters the aerobic secondary treatment stage 5 from setting tank 3, finally sends into then to receive in the water body, perhaps adds utilization in addition.The aerobic secondary treatment stage 5 can be to handle under the condition of bubbling air oxygen or pure oxygen in trickling filter, activated sludge device, fixed-bed reactor or pond system.The excessive activated sludge that produce this moment is delivered to sludge treatment device 6 equally.
The waste gas that produces in preprocessing process can be used as the oxygen carrier in the aerobic secondary treatment stage 5.For this purpose, air must be collected in pre-treatment jar 1, feeds trickling filter then or as air inlet, perhaps delivers in the treatment process after compression.
Because facultative anaerobe in the activated sludge jar 2 is carried out aeration, therefore the very tiny fiber that is present in the waste water may be woven into longer pigtail shape.Be installed in the dusting cover system 4 that returns in the mud path and can remove these fibers very effectively.
Claims (19)
1. waste water containing dye to textile industry and leather industry specifically is to contain the method that azoic dyestuff and sulphur waste water from dyestuff are carried out a biological disposal upon, it is characterized in that,
-the waste water that will contain dyestuff is sent into the anaerobism starting stage with negative redox potential, promptly first the treatment stage;
-when waste water after the anaerobic starting stage stops short residence time(SRT), this short residence time(SRT) depends on the type of dyestuff, and waste water is fed amphimicrobian or aerobic activation stage, promptly second the treatment stage, in this stage, activated sludge is greater than 1.0kg BOD/ (m
3Cultivate under * unit volume load d) and the positive redox potential condition of 0-180mV;
-after precipitation, the part of activated sludge is returned activation stage, a part is returned the anaerobism starting stage, and all the other are removed after thickening;
-nutrient is added waste water in starting stage and/or the activation stage, and keep negative redox potential in the starting stage;
-will import the aerobic secondary treatment stage from the waste water that activation stage comes out, promptly the 3rd the treatment stage;
-subsequently, the discharge of wastewater handled to receiving in the water body, is perhaps used separately.
2. the method for claim 1 is characterized in that, the redox potential in the continuously measured anaerobism starting stage, and by special aeration and/or Control Circulation to the activated sludge quantity of anaerobism starting stage and it is controlled between 0 to-550mV.
3. method as claimed in claim 2 is characterized in that, with oxidation reduction potential control at≤350mV.
4. as the described method of above-mentioned arbitrary claim, it is characterized in that, nitrogenous or phosphatic nutrient adding is contained in the waste water of dyestuff.
5. as the described method of above-mentioned arbitrary claim, it is characterized in that, sanitary wastewater or other waste water of deriving from humans and animals are added contain in the waste water of dyestuff.
6. method as claimed in claim 5 is characterized in that, sanitary wastewater or other waste water are mixed with activated sludge, again anaerobism starting stage and amphimicrobian or aerobic activation stage is returned in this activated sludge circulation.
7. as the described method of above-mentioned arbitrary claim, it is characterized in that the treating water that will produce is back to the anaerobism starting stage in the excessive activated sludge process of thickening.
8. as the described method of above-mentioned arbitrary claim, it is characterized in that the gas sampling that will produce in the starting stage in anaerobism is delivered to the aerobic secondary treatment stage.
9. wastewater treatment equipment that is used to implement the described method of above-mentioned arbitrary claim, it is characterized in that, activated sludge jar (2), setting tank (3) and the aerobic secondary treatment stage (5) of carrying out amphimicrobian or aerobic treatment all are installed in the downstream of the pre-treatment jar (1) of work under the anaerobic environment, and the pipeline of activated sludge being led back activated sludge jar (2) and pre-treatment jar (1) is installed on setting tank (3), and the pipeline that activated sludge is directed at sludge treatment device (6).
10. wastewater treatment equipment as claimed in claim 9 is characterized in that, in activated sludge being led go back to the pipeline way of activated sludge jar (2) and pre-treatment jar (1), a dusting cover system (4) is installed.
11., it is characterized in that pre-treatment jar (1), activated sludge jar (2) and aerobic secondary treatment stage (5) all are equipped with the device of control air or oxygen feeding as claim 9 or 10 described wastewater treatment equipments.
12., it is characterized in that pre-treatment jar (1), activated sludge jar (2) and aerobic secondary treatment stage (5) all are equipped with the device of control sludge recycle speed as arbitrary described wastewater treatment equipment among the claim 9-11.
13., it is characterized in that pre-treatment jar (1) is equipped with the device of accepting waste gas and waste gas being transferred to aerobic secondary treatment stage (5) as arbitrary described wastewater treatment equipment among the claim 9-12.
14., it is characterized in that the pipeline of leading back activated sludge jar (2) and pre-treatment jar (1) is equipped with inlet as arbitrary described wastewater treatment equipment among the claim 9-13, be used to feed sanitary wastewater or from other waste water of human or animal.
15. as arbitrary described wastewater treatment equipment among the claim 9-14, it is characterized in that, for the treating water that produces is installed a pipeline that leads to pre-treatment jar (1) from sludge treatment device (6).
16., it is characterized in that the aerobic secondary treatment stage (5) is by the trickling filter system implementation as arbitrary described wastewater treatment equipment among the claim 9-15.
17., it is characterized in that the aerobic secondary treatment stage (5) is an activated sludge device as arbitrary described wastewater treatment equipment among the claim 9-15.
18., it is characterized in that the aerobic secondary treatment stage (5) is a fixed bed type reactor as arbitrary described wastewater treatment equipment among the claim 9-15.
19., it is characterized in that the aerobic secondary treatment stage (5) is a pond system as arbitrary described wastewater treatment equipment among the claim 9-15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123458 CN1247166A (en) | 1998-10-22 | 1998-10-22 | Biological treatment process and unit for wate water containing dye in textile and leather industry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123458 CN1247166A (en) | 1998-10-22 | 1998-10-22 | Biological treatment process and unit for wate water containing dye in textile and leather industry |
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| CN1247166A true CN1247166A (en) | 2000-03-15 |
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| CN 98123458 Pending CN1247166A (en) | 1998-10-22 | 1998-10-22 | Biological treatment process and unit for wate water containing dye in textile and leather industry |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357201C (en) * | 2005-12-15 | 2007-12-26 | 南京大学 | Artificial leather effluent treating process |
| CN100384751C (en) * | 2006-06-22 | 2008-04-30 | 南京大学 | Method for treating wastewater of azo dye |
-
1998
- 1998-10-22 CN CN 98123458 patent/CN1247166A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357201C (en) * | 2005-12-15 | 2007-12-26 | 南京大学 | Artificial leather effluent treating process |
| CN100384751C (en) * | 2006-06-22 | 2008-04-30 | 南京大学 | Method for treating wastewater of azo dye |
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