CN104692594B - A kind of recycled polyester produces the processing method of waste water - Google Patents
A kind of recycled polyester produces the processing method of waste water Download PDFInfo
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- CN104692594B CN104692594B CN201510094389.5A CN201510094389A CN104692594B CN 104692594 B CN104692594 B CN 104692594B CN 201510094389 A CN201510094389 A CN 201510094389A CN 104692594 B CN104692594 B CN 104692594B
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Abstract
The present invention relates to a kind of recycled polyester produces the processing method of waste water.Recycled polyester production waste water is entered the first chemical oxidation pond by the present invention, the first neutralization regulating reservoir is entered after chemical oxidation, pH is adjusted to 6.5, it is dehydrated through the first centrifugal dehydrator, carry out first time biochemical treatment through anoxic pond the first sedimentation tank the first Aerobic Pond the second sedimentation tank, second chemical oxidation pond carries out chemical treatment, adjust pH=4, remove part COD, enter the second neutralization regulating reservoir, pH is adjusted to 7.5, it is dehydrated by the second centrifugal dehydrator, carry out second biochemical treatment through the second Aerobic Pond the 3rd sedimentation tank, enter the 3rd chemical oxidation pond and carry out chemical treatment, adjust pH=4, enter the 3rd neutralization regulating reservoir, pH is adjusted to 6, discharge after 3rd centrifugal dehydrator dehydration.Instant invention overcomes power consumption height, the high defect of cost.The present invention is friendly, compared with the way of distillation, cost for wastewater treatment is low, energy consumption is low, improves COD clearance, it is to avoid the not treatable problem of dangerous mother solution that the way of distillation is brought.
Description
Technical field
The present invention relates to method of wastewater treatment, produce the processing method of waste water particularly to a kind of recycled polyester.
Background technology
Recycled polyester is typically under certain reaction condition waste polyester by its depolymerization, obtain polyester basic monomer or
Oligomer, the raw material for fiber recombining.The waste water producing in production process is recycled polyester waste water.
Recycled polyester produces waste water with primary polyester production waste water nature difference greatly, is characterized in that useless Organic substance in water is dense
Degree is high, biodegradability is almost nil.
Before the present invention makes, process, currently without reasonable, the method that recycled polyester produces waste water.Real-world situation
Under, also only adopt distillating method, waste water is passed through distilling apparatus, its distillate is cooked biochemical treatment, and evaporated mother liquor is as danger
Waste disposal.Problems with is had using such waster water process：Way of distillation power consumption is high, can only process part distillate, difficulty waves
Sending out larger molecular organicses high boiling all remains in evaporated mother liquor, processes only as hazardous waste, and processing cost is high.
Content of the invention
The purpose of the present invention is that and overcomes drawbacks described above, develops the processing method that a kind of recycled polyester produces waste water.
The technical scheme is that：
A kind of recycled polyester produces the processing method of waste water, and it is as follows that it is mainly characterized by step：
(5) recycled polyester production waste water enters the first chemical oxidation pond；
(6) waste water after chemical oxidation enters the first neutralization regulating reservoir, and pH is adjusted to 6.5；
(7) waste water is dehydrated through the first centrifugal dehydrator；
(8) it is secondary that the waste water after being dehydrated carries out first through anoxic pond the-the first sedimentation tank the-the first Aerobic Pond the-the second sedimentation tank
Change is processed；
(5) water entrance the second chemical oxidation pond after first time biochemical treatment carries out chemical treatment, adjusts pH=4, removes
Part COD；
Waste water after (6) second chemical oxidation pond are processed enters the second neutralization regulating reservoir, and pH is adjusted to 7.5；
(7) pH value is adjusted to the waste water after 7.5 by the second centrifugal dehydrator dehydration；
(8) waste water after being dehydrated carries out second biochemical treatment through second Aerobic Pond the-the three sedimentation tank；
Water after (9) second biochemical treatment enters the 3rd chemical oxidation pond and carries out chemical treatment, adjusts pH=4；
Waste water after (10) the 3rd chemical oxidation pond are processed enters the 3rd neutralization regulating reservoir, and pH is adjusted to 6；
(11) pH value is adjusted to the waste water after 6 and discharges after the 3rd centrifugal dehydrator is dehydrated.
In described step (1) first time chemical oxidation treatment unit, add green vitriol 30g/L, 30% mistake
Hydrogen oxide 30ml/L, the control time of staying is 1h.
In the first time biochemical treatment of described step (4), control dissolved oxygen 0.1～0.5mg/L in anoxic pond, in anoxic pond
Add potassium nitrate 125mg/L, it is 1: 1 that sedimentation tank is back to the anoxic pond water yield with the ratio of anoxic pond inflow, hydraulic detention time
24h.
In Aerobic Pond in described step (4), (8) biochemical treatment, the second Aerobic Pond, controlled molten in pond by micro-pore aeration
Solution oxygen amount is 2～3mg/L, removes part COD, the second sedimentation tank, the 3rd sedimentation tank is back to the Aerobic Pond water yield and Aerobic Pond enters
The ratio of the water yield is 1: 1, hydraulic detention time 32h.
In second chemical oxidation treatment unit of described step (5), add green vitriol 15g/L, 30% mistake
Hydrogen oxide 15ml/L, the control time of staying is 1h.
In described step (9) third time chemical oxidation treatment unit, add green vitriol 15g/L, 30% mistake
Hydrogen oxide 15ml/L, the control time of staying is 1h.
Advantages of the present invention and effect are：
(1) water outlet reaches recycled polyester waste water after treatment《Integrated wastewater discharge standard》(GB8978-1996) three in
Level discharge standard.
(2) technical scheme or by close friend, compared with the way of distillation, cost for wastewater treatment is low, energy consumption is low, improves COD and removes
Rate, it is to avoid the dangerous mother solution not treatable problem that the way of distillation is brought.
The other concrete advantage of the present invention and effect will continue with explanation.
Brief description
Fig. 1 present invention process schematic flow sheet.
Specific embodiment
Visible as shown in Figure 1, the present invention is a kind of recycled polyester production wastewater treatment method, including physical chemistry process and
Biological treatment, comprises the following steps successively：
(1) waste water first enters chemical oxidation pond 1 (the first chemical oxidation pond) and is aoxidized, and acts on removal portion by chemical reagent
Point COD, and part hardly degraded organic substance is resolved into the easily biodegradable organicses of molecular weight, improve its biodegradability.
(2) waste water after chemical oxidation enters neutralization regulating reservoir 1, and wastewater pH is adjusted to 6.5.
(3) pH value is adjusted to the waste water after 6.5 and is dehydrated by centrifugal dehydrator 1.
(4) waste water after being dehydrated is through anoxic pond-sedimentation tank 1 (the first sedimentation tank)-Aerobic Pond 1 (the first Aerobic Pond)-precipitation
Pond 2 (the second sedimentation tank) carries out first time biochemical treatment.It is all provided between anoxic pond 1 and sedimentation tank 1, Aerobic Pond 1 and sedimentation tank 2
Put sludge reflux, to improve the sludge concentration of anoxic pond, Aerobic Pond, strengthen degraded organic matter of sewage effect, general reflux ratio control
It is made as the 100% of flow of inlet water.
(5) water entrance chemical oxidation pond 2 (the second chemical oxidation pond) after first time biochemical treatment carries out chemical treatment, pond
Interior regulation pH=4, the Organic substance of biochemical treatment post-modification is decomposed further, removes part COD.
(6) waste water after chemical oxidation pond 2 is processed enters the second neutralization regulating reservoir 2, and wastewater pH is adjusted to 7.5.
(7) pH value is adjusted to the waste water after 7.5 and is dehydrated by the second centrifugal dehydrator 2.
(8) it is secondary that the waste water after being dehydrated carries out second through Aerobic Pond 2 (the second Aerobic Pond)-sedimentation tank 3 (the 3rd sedimentation tank)
Change is processed.It is respectively provided with backflow to improve the sludge concentration of anoxic pond, Aerobic Pond between Aerobic Pond 2 and sedimentation tank 3, strengthen degraded
Organic matter of sewage effect, general control of reflux ratio is the 100% of flow of inlet water.
Water after (9) second biochemical treatment enters chemical oxidation pond 3 (the 3rd chemical oxidation pond) to be carried out at finally chemical
Reason, adjusts pH-4 in pond.
(10) waste water after chemical oxidation pond 3 is processed enters the 3rd neutralization regulating reservoir 3, and wastewater pH is adjusted to 6.
(11) pH value is adjusted to the discharge after the 3rd centrifugal dehydrator 3 dehydration of the waste water after 6.
In described step (1) first time chemical oxidation treatment unit, addition green vitriol 30g/L, 30%
Hydrogen peroxide 30ml/L, the control time of staying is 1h.Because waste textile produces the water outlet pH of recycled polyester waste water 3～4
Left and right, therefore suitably directly do chemical oxidation treatment.
In described step (4) first time biochemical treatment, control dissolved oxygen 0.1～0.5mg/L in anoxic pond, in anoxic pond
Middle addition potassium nitrate 125mg/L, makes microorganism remove partial organic substances denitrifying, sedimentation tank 1 is back to anoxic pond simultaneously
The water yield is 1: 1 with the ratio of anoxic pond inflow, hydraulic detention time 24h.
In the Aerobic Pond 1 in described step (4), (8) biochemical treatment, Aerobic Pond 2, controlled molten in pond by micro-pore aeration
Solution oxygen amount is 2～3mg/L, removes part COD, sedimentation tank 2, sedimentation tank 3 are back to the Aerobic Pond water yield and Aerobic Pond select the water yield it
Than for 1: 1, hydraulic detention time 32h.
In second chemical oxidation treatment unit of described step (5), addition green vitriol 15g/L, 30%
Hydrogen peroxide 15ml/L, the control time of staying is 1h.
In described step (9) third time chemical oxidation treatment unit, addition green vitriol 15g/L, 30%
Hydrogen peroxide 15ml/L, the control time of staying is 1h.
Process the water quality index of recycled polyester waste water using the technology of the present invention：
| pH | COD(mg/L) | Colourity (extension rate) | Waste water performance description | |
| Before processing | 4 | 7716 | 200 | Huang, irritant abnormal smells from the patient |
| After process | 6 | 272 | 10 | Limpid, tasteless |
As shown above, the waste water indices after being processed using the waste water treatment process of the present invention are all met and exceeded
GB8978-1996《Integrated wastewater discharges grade III Standard》Requirement, wherein COD drops to 272mg/L by 7716mg/L, and clearance reaches
To 96.5%, colourity is reduced to 10 times by 200 times, also achieves good effect, and the yellow with significant stimulation abnormal smells from the patient is given up
Liquid is through by becoming limpid, tasteless after this PROCESS FOR TREATMENT.Compared with the way of distillation, improve COD clearance, it is to avoid the way of distillation is brought
The not treatable problem of high-risk mother solution, also reduce operating cost, from the aspect of economical and environmentally friendly two, this technique is all
Great advance.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although with reference to relatively
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, the objective without deviating from technical solution of the present invention and scope, and it all should be covered at this
In the middle of the right of invention.
Claims (6)
1. a kind of recycled polyester produces the processing method of waste water it is characterised in that step is as follows：
(1) recycled polyester production waste water enters the first chemical oxidation pond；
(2) waste water after chemical oxidation enters the first neutralization regulating reservoir, and pH is adjusted to 6.5；
(3) waste water is dehydrated through the first centrifugal dehydrator；
(4) waste water after being dehydrated is carried out at biochemical for the first time through anoxic pond the-the first sedimentation tank the-the first Aerobic Pond the-the second sedimentation tank
Reason；
(5) water entrance the second chemical oxidation pond after first time biochemical treatment carries out chemical treatment, adjusts pH=4, removes part
COD；
Waste water after (6) second chemical oxidation pond are processed enters the second neutralization regulating reservoir, and pH is adjusted to 7.5；
(7) pH value is adjusted to the waste water after 7.5 by the second centrifugal dehydrator dehydration；
(8) waste water after being dehydrated carries out second biochemical treatment through second Aerobic Pond the-the three sedimentation tank；
Water after (9) second biochemical treatment enters the 3rd chemical oxidation pond and carries out chemical treatment, adjusts pH=4；
Waste water after (10) the 3rd chemical oxidation pond are processed enters the 3rd neutralization regulating reservoir, and pH is adjusted to 6；
(11) pH value is adjusted to the waste water after 6 and discharges after the 3rd centrifugal dehydrator is dehydrated.
2. a kind of recycled polyester according to claim 1 produces the processing method of waste water it is characterised in that described step (1)
In first time chemical oxidation treatment unit, add green vitriol 30g/L, 30% hydrogen peroxide 30ml/L, control stops
The time is stayed to be 1h.
3. a kind of recycled polyester according to claim 1 produces the processing method of waste water it is characterised in that described step (4)
In first time biochemical treatment, control dissolved oxygen 0.1～0.5mg/L in anoxic pond, in anoxic pond, add potassium nitrate 125mg/L,
It is 1: 1 that sedimentation tank is back to the anoxic pond water yield with the ratio of anoxic pond inflow, hydraulic detention time 24h.
4. a kind of recycled polyester according to claim 1 produces the processing method of waste water it is characterised in that described step
(4), the first Aerobic Pond in (8) biochemical treatment, in the second Aerobic Pond, by micro-pore aeration control dissolved oxygen content in pond be 2～
3mg/L, removes part COD, and it is 1 that the second sedimentation tank, the 3rd sedimentation tank are back to the Aerobic Pond water yield and the ratio of Aerobic Pond inflow:
1, hydraulic detention time 32h.
5. a kind of recycled polyester according to claim 1 produces the processing method of waste water it is characterised in that described step (5)
In second chemical oxidation treatment unit, add green vitriol 15g/L, 30% hydrogen peroxide 15ml/L, control stops
The time is stayed to be 1h.
6. a kind of recycled polyester according to claim 1 produces the processing method of waste water it is characterised in that described step (9)
In third time chemical oxidation treatment unit, add green vitriol 15g/L, 30% hydrogen peroxide 15ml/L, control stops
The time is stayed to be 1h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100225694B1 (en) * | 1996-12-03 | 1999-10-15 | 장병주 | Solid waste landfill leachate treatment process |
| CN101844379B (en) * | 2010-05-18 | 2012-09-05 | 北京朗林德通环保科技有限公司 | Device for producing regenerative polyester bottle chips by using waste plastics and production process thereof |
| CN102491591B (en) * | 2011-12-09 | 2014-12-03 | 宜兴市荣盛达环保有限公司 | Sewage treating and recycling system and method for high-concentration polyester slices |
| CN202390289U (en) * | 2011-12-21 | 2012-08-22 | 江阴明大化工有限公司 | Device for treating unsaturated polyester process wastewater efficiently |
| CN102557341B (en) * | 2011-12-26 | 2014-07-23 | 集惠瑞曼迪斯（上海）环保科技发展有限公司 | Treatment method of high-concentration emulsion waste water |
| CN103449685B (en) * | 2013-09-26 | 2014-09-17 | 中国海洋石油总公司 | Method for disposing high-salt high-polymer wastewater through Fenton oxidation and biology combined technology |
| CN103570191B (en) * | 2013-10-28 | 2014-12-10 | 浙江大学 | Biochemical treatment device and method for wastewater generated in production of polyester resin |
| CN203568944U (en) * | 2013-11-18 | 2014-04-30 | 苏州膜华材料科技有限公司 | Coking wastewater reuse treatment system |
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