CN104261537A - Discoloring process for refined cotton wastewater as well as wastes and application thereof - Google Patents
Discoloring process for refined cotton wastewater as well as wastes and application thereof Download PDFInfo
- Publication number
- CN104261537A CN104261537A CN201410515534.8A CN201410515534A CN104261537A CN 104261537 A CN104261537 A CN 104261537A CN 201410515534 A CN201410515534 A CN 201410515534A CN 104261537 A CN104261537 A CN 104261537A
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- China
- Prior art keywords
- waste water
- purified cotton
- cotton waste
- wastewater
- refined cotton
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
Abstract
The invention belongs to the field of sewage treatment and in particular relates to a discoloring process for refined cotton wastewater as well as wastes and an application thereof. According to the technical problem to be solved, the invention provides a discoloring process for refined cotton wastewater. With the adoption of the technical scheme, the process comprises the following steps: a, absorbing smoke dust in coal-fired boiler flue gas by using the refined cotton wastewater; b, regulating the pH value of the refined cotton wastewater in which the smoke dust is absorbed to be less than or equal to 4.5; c, regulating the pH value of the refined cotton wastewater to be more than or equal to 10.5, settling, thereby obtaining the clarified wastewater and ash residues; and d, regulating the pH value of the clarified wastewater to reach the integrated wastewater discharge standard, wherein the refined cotton wastewater in the step a refers to refined cotton wastewater of which COD (chemical oxygen demand) accords with the integrated discharge standard; and when the smoke dust in the coal-fired boiler flue gas is absorbed by using the refined cotton wastewater in the step a, the smoke dust per ton is controlled to be absorbed by using the refined cotton wastewater of less than or equal to 77tons. According to the method disclosed by the invention, the chroma of the refined cotton wastewater can be reduced to 30 times or below, and the integrated wastewater discharge standard is reached.
Description
Technical field
The invention belongs to field of sewage treatment, be specifically related to a kind of decoloration process of purified cotton waste water and refuse thereof and application.
Background technology
Purified cotton is the basic raw material of production of cellulose derivative.The degreasing of producing purified cotton is boiled and is washed operation and can produce waste water containing high COD concentration and high chroma.Waste water main component is fat, protein, pectin, tannin, hemicellulose, xylogen etc.Wherein hemicellulose, xylogen are the major causes causing colourity high.Due to the reason such as hemicellulose, xylogen, waste water decoloring process is exactly a great problem of a lot of enterprise.This waste water is by after biochemical treatment, and COD is minimized conformance with standard, but colourity after biochemical treatment still up to 300 times.Many at present tube settler is adopted to this waste water, biological carbon pond filters, or tube settler, activated coke process method process; Though aforesaid method is effective to reduction chroma in waste water, processing cost is higher, and can produce secondary pollution.
Those skilled in the art need the decoloration process of the low purified cotton waste water of a kind of processing cost badly.
Summary of the invention
Technical problem to be solved by this invention is to provide the decoloration process of the low purified cotton waste water of a kind of processing cost.
For solving the problems of the technologies described above, the technical solution adopted in the present invention comprises the steps:
A, the flue dust used in purified cotton waste water absorption fire coal boiler fume;
B, adjustment absorb purified cotton waste water ph≤4.5 after flue dust;
C, regulate purified cotton waste water ph >=10.5 again, sedimentation obtains clarified wastewater and lime-ash;
D, adjustment clarified wastewater reach integrated wastewater discharge standard to pH value;
Wherein, purified cotton waste water described in step a is the purified cotton waste water that COD meets integrated wastewater discharge standard; When absorbing the flue dust in fire coal boiler fume with purified cotton waste water described in step a, control flue dust per ton and adopt the purified cotton waste water absorption being less than and equaling 77t.
Because coal firing boiler can produce volume of smoke, adopt technique scheme, the oxide compound of metallic dust in flue dust as aluminium, zinc, iron is brought in waste water, by regulating pH to make it to become metal ion, in the basic conditions, generate the oxyhydroxide of metal, as the oxyhydroxide etc. of aluminium hydroxide, zinc hydroxide, iron, the oxyhydroxide flocculation of metal, the impurity developed the color in refining with adsorbents cotton wastes water sedimentation, reach the object of purified cotton waste water decoloring.
Because the metallic dust in flue dust plays a crucial role to purified cotton waste water decoloring effect, control flue dust per ton purified cotton waste water≤77t absorption and can guarantee that decolouring provides required metal ion.For avoiding the metallic dust in purified cotton waste water too much, preferably controlling flue dust per ton purified cotton waste water 47t ~ 77t and absorbing.
The coal that coal firing boiler described in technique scheme adopts both can be bituminous coal, also can be hard coal, and its flue dust composition is identical, was only that the generation of flue gas ash there are differences.
Flue dust in absorption fire coal boiler fume described in technique scheme step a can adopt spray, fire coal boiler fume be passed into the medium mode that the flue dust in fire coal boiler fume can be made to be absorbed by the purified cotton waste water that COD meets integrated wastewater discharge standard of purified cotton waste water.
In technique scheme, step b, c, d adjust ph material used can't introduce other pollutent pH value can be adjusted within the scope of this.
For saving production cost, step b adjust ph is 3.5 ~ 4.5, can make the metal oxide in lime-ash, and the oxide compound as aluminium, zinc, iron changes metal ion into.Owing to regulating pH to use acid in step b, and nitro-cotton can produce acid waste water in producing, and its pH value is 2 ~ 3, for the object of waste reclaimation, nitro-cotton acid wastewater can be used for adjust ph in step b.
For cost-saving, step c adjust ph can be selected and add calcium hydroxide adjust ph.In step c, preferred adjust ph is 10.5 ~ 11.5.
The waste water of purified cotton described in technique scheme need reduce COD, and it reduces COD and adopts conventional biochemical treatment mode process to up to standard.Due to reduce COD process in other pending items in purified cotton waste water can be made as the reduction such as BOD, suspended substance, fall COD again as first decoloured, then difficulty of decolouring can significantly increase, and decolorizing effect is difficult to reach integrated wastewater discharge standard.Therefore, mode of the present invention is applicable to the purified cotton waste water that COD meets integrated wastewater discharge standard.
Except technique scheme, the present invention also provides above-mentioned decoloration process gained lime-ash.
The starting material that above-mentioned decoloration process gained lime-ash can be used as roadbed or brickmaking use.
Beneficial effect of the present invention is as follows:
1, the purified cotton waste water that COD is up to standard, its colourity is up to more than 300 times, and after the inventive method process, colourity, below 30 times, reaches integrated wastewater discharge standard.
2, purified cotton waste water is used for coal firing boiler water dust scrubber flue gas ash removal water, saving water resource, make use of the metallic dust in flue gas simultaneously, achieves waste recovery recycling.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment
Waste water decoloring technique, successively through following step:
1, by the purified cotton waste water of colourity >=300 after biochemical treatment times, deliver to 35t/h boiler water film dust-remover top with pump with the water yield of 100t/h and down spray, implement boiler smoke water film dedusting, control flue dust per ton purified cotton waste water 47t ~ 77t;
2, add at water dust scrubber lower part outlet place the nitro-cotton acid wastewater that pH value is 2 ~ 3, pH value controlled to be 3.5 ~ 4.5, make the dust waste water of dust-laden slag in acid condition, metal oxide is analysed and is separated as metal ion;
3, be collected in settling tank by dust waste water and add milk of lime, control ph is 10.5 ~ 11.5, precipitation clarification more than 30min under the state relatively left standstill, and to be delivered to after neutralization tank carries out neutralizing treatment by upper strata clear water reach integrated wastewater discharge standard discharge with pump;
4, settling tank bottom ashe dragged for lime-ash stacking ground, the starting material sent outside as roadbed, brickmaking use.
Purified cotton waste water after aforesaid method decolouring, colourity is less than 30 times, meet GB8978-1996 standard regulation, simultaneously, save boiler water film water for dust removal, and nitro-cotton acid wastewater achieves utilization of waste material, lime-ash uses as the starting material of roadbed, brickmaking, not only achieves saving processing cost and also creates economic worth.
Claims (9)
1. the decoloration process of purified cotton waste water, is characterized in that, comprises the following steps:
A, the flue dust used in purified cotton waste water absorption fire coal boiler fume;
B, adjustment absorb purified cotton waste water ph≤4.5 after flue dust;
C, regulate purified cotton waste water ph >=10.5 again, sedimentation obtains clarified wastewater and lime-ash;
D, adjustment clarified wastewater reach integrated wastewater discharge standard to pH value;
Wherein, purified cotton waste water described in step a is the purified cotton waste water that COD meets integrated wastewater discharge standard; When absorbing the flue dust in fire coal boiler fume with purified cotton waste water described in step a, control flue dust per ton and adopt the purified cotton waste water absorption being less than and equaling 77t.
2. the decoloration process of purified cotton waste water according to claim 1, is characterized in that: when step a purified cotton waste water absorbs the flue dust in fire coal boiler fume, control flue dust per ton purified cotton waste water 47t ~ 77t and absorb.
3. the decoloration process of purified cotton waste water according to claim 1 and 2, is characterized in that: step b adjust ph is 3.5 ~ 4.5.
4. the decoloration process of purified cotton waste water according to claim 1, is characterized in that: step c adjust ph is 10.5 ~ 11.5.
5. the decoloration process of the purified cotton waste water according to any one of Claims 1 to 4, is characterized in that: step b, step c, steps d adjust ph material used can't introduce other pollutent pH value can be adjusted within the scope of this.
6. the decoloration process of purified cotton waste water according to claim 5, is characterized in that: step b adjust ph is the acid waste water adding the generation of nitro-cotton technique.
7. the decoloration process of purified cotton waste water according to claim 5, is characterized in that: step c adjust ph is for adding calcium hydroxide adjust ph.
8. the decoloration process gained lime-ash of any one of claim 1 ~ 7 purified cotton waste water.
9. the application of lime-ash according to claim 8 in roadbed or brickmaking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515534.8A CN104261537A (en) | 2014-09-29 | 2014-09-29 | Discoloring process for refined cotton wastewater as well as wastes and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515534.8A CN104261537A (en) | 2014-09-29 | 2014-09-29 | Discoloring process for refined cotton wastewater as well as wastes and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104261537A true CN104261537A (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410515534.8A Pending CN104261537A (en) | 2014-09-29 | 2014-09-29 | Discoloring process for refined cotton wastewater as well as wastes and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112194313A (en) * | 2020-09-16 | 2021-01-08 | 广东硕成科技有限公司 | Wastewater treatment method and application thereof |
Citations (5)
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|---|---|---|---|---|
| CN85102583A (en) * | 1985-04-01 | 1986-09-24 | 南京大学 | Dyeing and printing sewage treatment process and technology |
| CN101397164A (en) * | 2007-09-24 | 2009-04-01 | 宝山钢铁股份有限公司 | Processing method of flue gas cooling waste water during sintered flue gas desulfurization process and use of product after processing |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
| CN103351076A (en) * | 2013-07-16 | 2013-10-16 | 李德志 | Comprehensive industrial wastewater processing method |
| CN103755074A (en) * | 2014-01-27 | 2014-04-30 | 北京科泰兴达高新技术有限公司 | Treatment system for flue gas and reverse osmosis concentrated water |
-
2014
- 2014-09-29 CN CN201410515534.8A patent/CN104261537A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102583A (en) * | 1985-04-01 | 1986-09-24 | 南京大学 | Dyeing and printing sewage treatment process and technology |
| CN101397164A (en) * | 2007-09-24 | 2009-04-01 | 宝山钢铁股份有限公司 | Processing method of flue gas cooling waste water during sintered flue gas desulfurization process and use of product after processing |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
| CN103351076A (en) * | 2013-07-16 | 2013-10-16 | 李德志 | Comprehensive industrial wastewater processing method |
| CN103755074A (en) * | 2014-01-27 | 2014-04-30 | 北京科泰兴达高新技术有限公司 | Treatment system for flue gas and reverse osmosis concentrated water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112194313A (en) * | 2020-09-16 | 2021-01-08 | 广东硕成科技有限公司 | Wastewater treatment method and application thereof |
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Application publication date: 20150107 |