CN100486918C - Method for realizing closed cycle of dyeing waste water - Google Patents

Method for realizing closed cycle of dyeing waste water Download PDF

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Publication number
CN100486918C
CN100486918C CNB2006100929899A CN200610092989A CN100486918C CN 100486918 C CN100486918 C CN 100486918C CN B2006100929899 A CNB2006100929899 A CN B2006100929899A CN 200610092989 A CN200610092989 A CN 200610092989A CN 100486918 C CN100486918 C CN 100486918C
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waste water
dyeing waste
dyeing
cod
colourity
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CN1884146A (en
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张永锋
吉仁塔布
郝云升
王先平
崔景东
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Inner Mongolia University of Technology
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Abstract

The invention discloses a disposing method of loop circulating printing and dyeing wastewater, which is characterized by the following: regenerating printing and dyeing wastewater; removing most of COD and colority in the printing and dyeing wastewater through flocculating and sedimenting; proceeding further disposal in the micro-filter; obtaining the disposed water with less than 10mg/L COD and 300 mus/ms conductivity without turbidity, SS and colority; utilizing soft water in the printing and dyeing technology as washing water to realize loop circulation.

Description

The treatment process of dyeing waste water closed cycle
Technical field:
The present invention relates to a kind of treatment process of dyeing waste water closed cycle, belong to wastewater treatment method.
Background technology:
Dyeing is the industrial wastewater discharge rich and influential family, and according to incompletely statistics, national dyeing waste water quantity discharged every day is 3 * 10 6~4 * 10 6 tDyeing waste water has characteristics such as the water yield is big, colourity dark, alkalescence is big, variation water quality is big, belongs to unmanageable trade effluent.China's integrated wastewater discharge standard (GB8978-1996) is clearly stipulated the project of building after 1 day January in 1998, must carry out new emission standard.New standard has been made strict more regulation to the discharging of dyeing waste water, and traditional techniques of Dyeing Wastewater Treatment is difficult to reach the requirement of new standard.Therefore, the effective techniques of Dyeing Wastewater Treatment of exploiting economy becomes the focus that current environmental protection industry (epi) is paid close attention to day by day.
The method of treatment of dyeing and printing is a lot, and as flocculation sediment, absorption, ion-exchange, ultrafiltration, chemical oxidation, photoxidation, electrolysis and bioremediation, industrial method commonly used has methods such as flocculation sediment, electrolysis, oxidation, absorption, biological degradation.Single method is difficult to thorough treatment of dyeing and printing, for example the flocculent precipitation of one of treatment of dyeing and printing common method has characteristics such as equipment is simple, convenient management, and is suitable for batch operation, but under the smaller situation of COD value, the clearance of colourity and COD is not high; Though bioremediation has the advantage of the secondary pollution of not bringing, it can not remove enough colourity, COD and ionogen etc.Along with the continuous development of printing technology and the exploitation of new dye, the characteristics that it is more and more difficult that the dyestuff composition becomes increasingly complex and be degraded by microorganisms degree make dyeing waste water become one of domestic and international unmanageable trade effluent.Especially the colourity of dyeing waste water, traditional method intractable, but the nanofiltration membrane separation technology can effectively removal colourity.
Membrane separation technique is a new and high technology that grows up over nearly 30 years, has obtained using widely in various fields at present.From existing data, abroad, mainly concentrate in the raising of film properties, but purpose is to make dyestuff in the concentrated solution recyclable and see through the liquid reuse or reach emission standard for adopting membrane separation process to administer Dyeing Wastewater.Though domestic have many research institutions to be engaged in the research of membrane technique aspect treatment of dyeing wastewater, these researchs rest on the experimental study stage mostly, also do not have actual application.
It is numerous that Inner Mongolia Autonomous Region is processed as main textile printing and dyeing enterprises with wool, cashmere, and private, individual enterprise is more.At present, the waste water of these enterprise's dischargings is not effectively administered mostly, and this has not only caused environmental pollution, and has wasted water resources.Many private, individual enterprises are because industrial scale is little. and be subjected to the influence in market bigger, their dyeing workshop has some months to stop production in general 1 year, thereby the biologic treating techniques such as bio-contact oxidation of technology comparative maturity can't effectively move at present.And these biologic treating technique floor spaces are bigger, and the enterprise more in short supply for the soil can't adopt.Moreover Inner Mongolia Autonomous Region shortage of water resources if the dyeing waste water after handling can be carried out reuse, just can be saved a large amount of former water.
Summary of the invention:
At the problems referred to above, the invention provides a kind of effective technology that is fit to large, medium and small printing and dyeing enterprise treatment of dyeing wastewater of researching and developing, present technique is to be the dyeing waste water closed cycle technology of core with the membrane separation technique, can realize the closed cycle of dyeing waste water, when administering the dyeing waste water pollution, realized the regeneration of dyeing waste water.This technology has not only solved the pollution problem of dyeing, has protected ecotope, also provides the theory and technology support for promoting cleaner production at dyeing.
Purpose of the present invention is implemented by following technical scheme:
The treatment process of dyeing waste water closed cycle includes following steps:
1) dyeing waste water is entered the dyeing waste water collecting tank, described dyeing waste water removes colourity and COD more than 50% through flocculation sediment, and the mud of generation is through separating centrifuge or plate-and-frame filter press dehydration;
2) enter micro-strainer through the flocculation sediment separated liquid supernatant and remove small flco and get filtrate, described filtrate has reached emission standard, and the filtrate discharging with 20%-30% to prevent the accumulation of salt, influences the normal operation of closed circuit circulatory system;
3) step 2) filtrate of the remainder that obtains enters the nanofiltration membrane treatment system after the high-pressure pump pressurization, and waste water is further purified, and obtains reuse water; The nanofiltration concentrated solution that produces enters the dyeing waste water collecting tank again, carries out closed cycle and handles;
4) described reuse water is as preparation dyeing and printing process soft water source or as the washing water in the dyeing process, thereby realized the closed cycle of dyeing waste water.
The employed flocculation agent of described flocculation sediment technology is polymerize aluminum chloride PAC, and coagulant aids is polyacrylamide PAM, and the addition of described PAC is 100~200mg/L, and the addition of described PAM is 0.5~1mg/L.
Described COD<150mg/L through the supernatant liquor behind the flocculation sediment, specific conductivity<400 μ s/ms, turbidity<30mg/L, SS<60mg/L, colourity<60 times.
The microfiltration membrane material of described micro-strainer is a kind of in polyvinylidene difluoride (PVDF), tetrafluoroethylene, carbon microporous pipe and the ceramic membrane microporous pipe.
Described micro-strainer internal pressure 0.03~0.5MPa, 25~85 ℃ of temperature, pH value 4~12.
COD<the 90mg/L of described filtrate, specific conductivity<600 μ s/ms, turbidity<10mg/L, SS<20mg/L, colourity<50 times; Reach the safety dumping requirement.
In order to prevent the accumulation of inorganic salt, guarantee the normal operation of native system, 20%~40% qualified discharge of micro-filtration water outlet.
The nanofiltration membrane material of described nanofiltration membrane treatment system is a kind of in aromatic polyamides, polyvinyl alcohol, the sulfonated polyether sulfone, and structure formation is rolling or tubular fibre formula.
The described nanofiltration membrane treatment internal pressure 0.8~2.0MPa of system, 25~90 ℃ of temperature, pH value 4~12.
COD<the 10mg/L of described reuse water, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than.
The invention has the advantages that: the present invention provides a kind of treatment technology that is easy to the closed cycle of industrialized realization dyeing waste water, can realize the regeneration of dyeing waste water, dyeing waste water is after flocculation sediment removes most COD and colourity, after the micro-strainer pre-treatment, enter the further advanced treatment of nanofiltration system, handle the COD<10mg/L of back water outlet, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than, can be used as preparation dyeing and printing process soft water source or, thereby realized the closed cycle of dyeing waste water as the washing water in the dyeing process.Process stabilizing of the present invention, easy to operate, the influence of the gentle plant downtime of not being bullied, running cost is low, is highly susceptible to industrial applications, and dyeing waste water is realized closed cycle.Adopt the technology of the present invention, renewable 60%~80% dyeing waste water, the COD<10mg/L of reuse water, specific conductivity<300 μ s/ms, turbidity, colourity and SS all detect less than.
Description of drawings:
Fig. 1 is the process flow diagram of dyeing waste water closed cycle.
Embodiment:
Embodiment 1: as shown in Figure 1, the treatment process of dyeing waste water closed cycle includes following steps:
1) dyeing waste water is entered the dyeing waste water collecting tank, adopt accelerator, add flocculation agent and coagulant aids, the residence time is 20min, wherein the employed flocculation agent of flocculation sediment technology is polymerize aluminum chloride PAC, and the addition of PAC is 100mg/L, and coagulant aids is polyacrylamide PAM, the addition of PAM is 0.5mg/L, and the mud of generation dewaters through separating centrifuge; Through the COD<150mg/L of the supernatant liquor behind the flocculation sediment, specific conductivity<400 μ s/ms, turbidity<30mg/L, SS<60mg/L, colourity<60 times, dyeing waste water removes colourity and COD more than 50% through flocculation sediment.Dyeing waste water removes colourity and COD through flocculation sediment technology,
2) entering micro-strainer through the flocculation sediment separated liquid supernatant removes small flco and gets filtrate, the microfiltration membrane material of micro-strainer is a polyvinylidene difluoride (PVDF), also can be a kind of in tetrafluoroethylene or carbon microporous pipe or the ceramic membrane microporous pipe, the micro-strainer internal pressure is 0.03MPa, temperature is 25 ℃, and the pH value is 4, the COD<90mg/L of filtrate, specific conductivity<600 μ s/ms, turbidity<10mg/L, SS<20mg/L, colourity<50 times; Reach the safety dumping requirement.In order to prevent the accumulation of inorganic salt, 20% filtrate is discharged in the normal operation that influences closed circuit circulatory system.
3) step 2) filtrate of the remainder that obtains enters the nanofiltration membrane treatment system after the high-pressure pump pressurization, and waste water is further purified, and obtains reuse water; The nanofiltration concentrated solution that produces enters the dyeing waste water collecting tank again, carries out closed cycle and handles.Wherein the nanofiltration membrane material of nanofiltration membrane treatment system is an aromatic polyamides, and structure formation is rolling, and the nanofiltration membrane material also can be in polyvinyl alcohol or the sulfonated polyether sulfone any, and its structure formation also can be the tubular fibre formula; Nanofiltration membrane treatment system internal pressure is 0.8MPa, and temperature is 25 ℃, and the pH value is 4.COD<the 10mg/L of reuse water, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than.
4) reuse water is as preparation dyeing and printing process soft water source or as the washing water in the dyeing process, thereby realized the closed cycle of dyeing waste water.
Embodiment 2: as shown in Figure 1, the treatment process of dyeing waste water closed cycle includes following steps:
1) dyeing waste water is entered the dyeing waste water collecting tank, adopt accelerator, add flocculation agent and coagulant aids, the residence time is 20min, wherein the employed flocculation agent of flocculation sediment technology is polymerize aluminum chloride PAC, and the addition of PAC is 200mg/L, and coagulant aids is polyacrylamide PAM, the addition of PAM is 1mg/L, and the mud of generation dewaters through plate-and-frame filter press; Through the COD<150mg/L of the supernatant liquor behind the flocculation sediment, specific conductivity<400 μ s/ms, turbidity<30mg/L, SS<60mg/L, colourity<60 times, dyeing waste water removes colourity and COD more than 50% through flocculation sediment.
2) entering micro-strainer through the flocculation sediment separated liquid supernatant removes small flco and gets filtrate, the microfiltration membrane material of micro-strainer is a polyvinylidene difluoride (PVDF), also can be a kind of in tetrafluoroethylene or carbon microporous pipe or the ceramic membrane microporous pipe, the micro-strainer internal pressure is 0.5MPa, temperature is 85 ℃, and the pH value is 12, the COD<90mg/L of filtrate, specific conductivity<600 μ s/ms, turbidity<10mg/L, SS<20mg/L, colourity<50 times; Reach the safety dumping requirement.In order to prevent the accumulation of inorganic salt, 25% filtrate is discharged in the normal operation that influences closed circuit circulatory system.
3) step 2) filtrate of the remainder that obtains enters the nanofiltration membrane treatment system after the high-pressure pump pressurization, and waste water is further purified, and obtains reuse water; The nanofiltration concentrated solution that produces enters the dyeing waste water collecting tank again, carries out closed cycle and handles.Wherein the nanofiltration membrane material of nanofiltration membrane treatment system is an aromatic polyamides, and structure formation is rolling, and the nanofiltration membrane material also can be in polyvinyl alcohol or the sulfonated polyether sulfone any, and its structure formation also can be the tubular fibre formula; Nanofiltration membrane treatment system internal pressure is 2.0MPa, and temperature is 90 ℃, and the pH value is 12.COD<the 10mg/L of reuse water, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than.
4) reuse water is as preparation dyeing and printing process soft water source or as the washing water in the dyeing process, thereby realized the closed cycle of dyeing waste water.
Embodiment 3: as shown in Figure 1, the treatment process of dyeing waste water closed cycle includes following steps:
1) dyeing waste water is entered the dyeing waste water collecting tank, adopt accelerator, add flocculation agent and coagulant aids, the residence time is 20min, wherein the employed flocculation agent of flocculation sediment technology is polymerize aluminum chloride PAC, and the addition of PAC is 150mg/L, and coagulant aids is polyacrylamide PAM, the addition of PAM is 0.75mg/L, and the mud of generation dewaters through separating centrifuge; Through the COD<150mg/L of the supernatant liquor behind the flocculation sediment, specific conductivity<400 μ s/ms, turbidity<30mg/L, SS<60mg/L, colourity<60 times, dyeing waste water removes colourity and COD more than 50% through flocculation sediment.
2) entering micro-strainer through the flocculation sediment separated liquid supernatant removes small flco and gets filtrate, the microfiltration membrane material of micro-strainer is a polyvinylidene difluoride (PVDF), also can be a kind of in tetrafluoroethylene or carbon microporous pipe or the ceramic membrane microporous pipe, the micro-strainer internal pressure is 0.27MPa, temperature is 55 ℃, and the pH value is 8, the COD<90mg/L of filtrate, specific conductivity<600 μ s/ms, turbidity<10mg/L, SS<20mg/L, colourity<50 times; Reach the safety dumping requirement.In order to prevent the accumulation of inorganic salt, influence the normal operation of closed circuit circulatory system, filtrate discharging with 30%.
3) step 2) filtrate of the remainder that obtains enters the nanofiltration membrane treatment system after the high-pressure pump pressurization, and waste water is further purified, and obtains reuse water; The nanofiltration concentrated solution that produces enters the dyeing waste water collecting tank again, carries out closed cycle and handles.Wherein the nanofiltration membrane material of nanofiltration membrane treatment system is an aromatic polyamides, and structure formation is rolling, and the nanofiltration membrane material also can be in polyvinyl alcohol or the sulfonated polyether sulfone any, and its structure formation also can be the tubular fibre formula; Nanofiltration membrane treatment system internal pressure is 1.9MPa, and temperature is 58 ℃, and the pH value is 8.COD<the 10mg/L of reuse water, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than.
4) reuse water is as preparation dyeing and printing process soft water source or as the washing water in the dyeing process, thereby realized the closed cycle of dyeing waste water.
The treatment effect of each processing unit of embodiment is shown in Table 1.
Table 1 dyeing waste water each processing unit treatment effect

Claims (3)

1. the treatment process of dyeing waste water closed cycle is characterized in that, includes following steps:
1) dyeing waste water is entered the dyeing waste water collecting tank, described dyeing waste water removes colourity and COD more than 50% through flocculation sediment, and the mud of generation is through separating centrifuge or plate-and-frame filter press dehydration; The employed flocculation agent of wherein said flocculation sediment technology is polymerize aluminum chloride PAC, and coagulant aids is polyacrylamide PAM, and the addition of described PAC is 100~200mg/L, and the addition of described PAM is 0.5~1mg/L; Through the COD<150mg/L of the supernatant liquor behind the flocculation sediment, specific conductivity<400 μ s/ms, turbidity<30mg/L, SS<60mg/L, colourity<60 times;
2) enter micro-strainer through the flocculation sediment separated liquid supernatant and remove small flco and get filtrate, described filtrate has reached emission standard, the filtrate discharging with 20%-30%; Wherein said micro-strainer internal pressure 0.03~0.5MPa, 25~85 ℃ of temperature, pH value 4~12; COD<the 90mg/L of described filtrate, specific conductivity<600 μ s/ms, turbidity<10mg/L, SS<20mg/L, colourity<50 times; Reach the safety dumping requirement;
3) step 2) filtrate of the remainder that obtains enters the nanofiltration membrane treatment system after the high-pressure pump pressurization, and waste water is further purified, and obtains reuse water; The nanofiltration concentrated solution that produces enters the dyeing waste water collecting tank again, carries out closed cycle and handles; The nanofiltration membrane material of wherein said nanofiltration membrane treatment system is a kind of in aromatic polyamides, polyvinyl alcohol, the sulfonated polyether sulfone, and structure formation is rolling or tubular fibre formula; The described nanofiltration membrane treatment internal pressure 0.8~2.0MPa of system, 25~90 ℃ of temperature, pH value 4~12;
4) described reuse water is as preparation dyeing and printing process soft water source or as the washing water in the dyeing process, thereby realized the closed cycle of dyeing waste water.
2. the treatment process of dyeing waste water according to claim 1 is characterized in that, the microfiltration membrane material of described micro-strainer is a kind of in polyvinylidene difluoride (PVDF), tetrafluoroethylene, carbon microporous pipe and the ceramic membrane microporous pipe.
3. the treatment process of dyeing waste water according to claim 1 is characterized in that, the COD<10mg/L of described reuse water, specific conductivity<300 μ s/ms, turbidity, SS and colourity all detect less than.
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