CN109678273A - A kind of purifying treatment method of rawhide preimpregnation aqueous waste solution - Google Patents
A kind of purifying treatment method of rawhide preimpregnation aqueous waste solution Download PDFInfo
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- CN109678273A CN109678273A CN201811542491.7A CN201811542491A CN109678273A CN 109678273 A CN109678273 A CN 109678273A CN 201811542491 A CN201811542491 A CN 201811542491A CN 109678273 A CN109678273 A CN 109678273A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention proposes a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution, which in turn includes the following steps: the dehydration and drying processing of filtering, coagulating, air-flotation process, the reuse of water outlet or the condensing crystallizing, dross of the waste liquid that soaks；The advantages of the principle of the present invention is using gas floatation process, it will be complex in composition, the high soaking of hide or skin waste liquid of suspension content carries out efficient, quickly processing, the clear water obtained after processing can direct reuse, or carry out concentration, effluent reuse is when the process hides manufacturing procedure of rawhide, because impurity content is few, it can ensure that the consistency of final leather products quality, and effectively reduce the consumption of process hides water and the usage amount of sodium chloride, when sodium chloride concentration is higher in water outlet, it can be directly concentrated to recycle sodium chloride, to effectively reduce chloride ion content in synthetic leather wastewater, realize the qualified discharge of waste water.
Description
[technical field]
The present invention relates to water-treatment technology fields, and in particular to the purifying treatment method of aqueous waste solution is presoaked to process hides rawhide,
To realize effective reuse of the waste water, the pollution of sodium chloride in waste water is reduced.
[background technique]
Salted anti-corrosion is always the most usual manner that process hides processing rawhide saves, and usual salted process will use fresh rawhide
The sodium chloride (Yu Shuxian, modern rawhide storage technical literature summary, Chinese leather, 1999,17:23-24) of weight 20~40%.
Although current leather-making enterprises can carry out at recycling the solid salt on rawhide using the mechanical system of shake desalination before processing
Reason, but most salt still retains in rawhide, and enter in immersion liquid in pre- soaking process (Jan-Tiest Pelckmans,
The method for reducing salt content in leather-making waste water, Chinese leather, 2005,1:42-45).Statistics shows salt brined hide per ton into waste water
The sodium chloride of discharge is in 300kg or more, and chlorine ions are at concentrations up to 25000~35000mg/L (Wei in this waste liquid that causes to soak
Clouds rosy clouds etc., Analysis on influencing factors of tannery wastewater treatment, industrial water and waste water, 2007,38:43-46).This high concentration
Salt water not only influences wastewater treatment efficiency (influencing microorganism in biochemistry pool), while because chloride ion is difficult in sewage disposal system
Conversion and and eliminate, cause chloride ion content in the aqueous solution of terminal drainage exceeded, be unable to satisfy state compulsory standard (such as GB
30486) emission request.
For many years, lasting research has been carried out in terms of sodium chloride pollution during eliminating soaking of hide or skin both at home and abroad, wherein most
Effective approach be waste liquid reuse (Yu from just etc., the pollutional load and its countermeasure of master operation, China Leather in process hides processing
Leather, 2004,23:28-31).However during soaking in advance because of rawhide, with sodium chloride, into the substance in immersion liquid, there are also blood simultaneously
The a large amount of organic matter such as dirt, soluble protein, fat, hair, scurf, and immersion when be added surfactant, alkali, kill
The process hides auxiliary agent such as microbial inoculum, this causes in immersion waste liquid, and suspended matter is more, complex in composition, can not carry out direct reuse, necessary before reuse
Carry out effective purified treatment.(Zhang Zhuandou, a kind of process hides being repeatedly circulated waste water from soaking to dyeing are raw for existing patent
Production. art, CN102534056B, 2011) the dedicated liquid storage tank of setting is reported by immersion waste liquid centralized recovery, then addition wadding
Natural subsidence after solidifying agent, mixing takes clear liquid to be back to the technology of immersion process；The technical operation is simple, but its nature for using
Sedimentation profile causes treatment effeciency low, and deposit needs periodic cleaning, and the organic matter contained in synchronous deposits is easily
It causes going bad for water body smelly, influences the working environment in workshop.
In view of the processing technique status of rawhide preimpregnation aqueous waste solution, it is proposed that a kind of purified treatment side of rawhide preimpregnation aqueous waste solution
Method.
[summary of the invention]
The object of the invention is to solve the problems of the prior art, a kind of purified treatment of rawhide preimpregnation aqueous waste solution is proposed
Method, to solve the pollution problem of waste liquid middle and high concentration sodium chloride generation, and to treated, aqueous solution carries out reuse, has
The feature that processing is efficient, effect is obvious.
To achieve the above object, the invention proposes a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution, successively include
Following steps: the filtering of the waste liquid that soaks, coagulating, air-flotation process, the reuse of water outlet or condensing crystallizing, dross dehydration and drying
Processing, the operation of each step are as follows:
S1. the filtering of immersion waste liquid: the immersion waste liquid given off from rotary drum is filtered using fine fack, to remove big ruler
Very little particulate matter, then by waste collection in coagulating basin；
S2. coagulating: flocculant is added into coagulating basin, and carries out being sufficiently mixed reaction under stiring, makes in waste liquid
Impurity forms floc particle and suspends in water, and obtains coagulating treated waste water；
S3. air-flotation process: by coagulating, treated that waste water is delivered in the flotation tank having been turned on, and carries out at air bearing
Reason, makes wadding body form dross with bubble floating, and the clear water of lower layer's water outlet is discharged by collector pipe；
S4. the reuse being discharged or condensing crystallizing: checking the Baume degrees of water outlet, determines that effluent reuse produced according to Baume degrees
Journey, or carry out condensing crystallizing processing；
S5. the dehydration and drying processing of dross: after dross is collected, it is incorporated in the sludge to be drained off of enterprise's sewage treatment place
In, then it is carried out dehydrating using plate and frame filter press or centrifuge.
Preferably, being filtered using thin rotary machine grid to immersion waste liquid in the step S1.
Preferably, the stirring condition of the step S2 coagulating are as follows: be sufficiently mixed under 50~450rpm speed of agitator
Reaction 10~30 minutes.
Preferably, the flocculant in the step S2 coagulating includes: aluminium polychloride, non-ionic polyacrylamide
And cationic polyacrylamide, the concentration after wherein aluminium polychloride is added are 30~100mg/L, nonionic polyacrylamide is added
Concentration afterwards is 0.5~10mg/L, and the concentration after cationic polyacrylamide is added is 0.5~10mg/L.
Preferably, the aluminium polychloride is added after being configured to 2~3% aqueous solution, the nonionic polyacrylamide
Amine and cationic polyacrylamide are added after being configured to 0.1~0.3% aqueous solution.
Preferably, the step S3 air-flotation process uses pressure air-dissolving air-float processing equipment, pressuring method is that pump is laggard
Gas method: being passed through compressed air using air compressor machine on pressure pipe, enters back into dissolving, and then dissolved air water enters flotation tank, to mixed
Condensate carries out flotation, and the operating pressure of dissolved air water is 0.2~0.5MPa.
Preferably, the step S3 air-flotation process uses pressure air-dissolving air-float processing equipment, pressuring method is that pump advances
Gas method: being drawn air into using water sprayer and is mixed with water, then is sent into dissolving through water pump, and then dissolved air water enters flotation tank,
Flotation is carried out to coagulation water, the operating pressure of dissolved air water is 0.2~0.5MPa.
Preferably, reuse or the condensing crystallizing of the step S4 water outlet, the Baume degrees inspection of water outlet: if Baume degrees is greater than
20oBe' will carry out condensing crystallizing, isolate salt after effluent collection；If Baume degrees is less than 20oBe', water outlet direct reuse is arrived
During rawhide is processed, comprising: rawhide soaks in advance, main immersion, pickling procedure；Simultaneously by part effluent recycling, and pass through pump
Enter in dissolving after pressurization, molten gas in air-flotation process process.
Beneficial effects of the present invention: the present invention carries out purified treatment to the waste liquid using dissolved air flotation, which includes
The dehydration and drying processing of filtering, coagulating, air-flotation process, the reuse of water outlet or the condensing crystallizing, dross of immersion waste liquid, makes to locate
Aqueous after reason is limpid, mainly contains sodium chloride, can be back to the processes such as immersion, the pickling of rawhide；When treated aqueous solution
When middle salinity is higher, condensing crystallizing can be directly carried out, the dross isolated in treatment process is waited for enterprise's sewage treatment place
After the sludge mixing of dehydration, it is carried out dehydrating, has the advantage that
(1) water treatment facilities used in, occupied area is small, treatment effeciency is high；
(2) after using this method to soaking of hide or skin liquid waste processing, water clarity is high out, and suspension content is few；
(3) effluent reuse is when the process hides manufacturing procedure of rawhide, because impurity content is few, it can be ensured that final leather products quality
Consistency, and effectively reduce the consumption of process hides water and the usage amount of sodium chloride；
(4) it when sodium chloride concentration is higher in water outlet, can be directly concentrated to recycle sodium chloride, to effectively reduce system
Chloride ion content in comprehensive wastewater is removed from office, realizes the qualified discharge of waste water.
Feature and advantage of the invention will be described in detail by embodiment combination attached drawing.
[Detailed description of the invention]
Fig. 1 is a kind of flow chart of the purifying treatment method of rawhide preimpregnation aqueous waste solution of the present invention using air inlet method after pump；
Fig. 2 is a kind of flow chart of the purifying treatment method of rawhide preimpregnation aqueous waste solution of the present invention using air inlet method before pumping.
[specific embodiment]
The present invention is described in detail below by embodiment, it is necessary to which indicated herein is that following embodiment is only used
In invention is further explained, it should not be understood as limiting the scope of the invention, the people that is skilled in technique in the field
Member can make some nonessential modifications and adaptations to the present invention according to the content of foregoing invention.
Embodiment 1:
Ox-hide tannery rawhide presoaks the purified treatment of aqueous waste solution refering to fig. 1:
The filtering of step S1. immersion waste liquid: it will be given off in rotary drum using the rotary machine grid that rake teeth grid gap is 1mm
The waste liquid that soaks filters, then by waste collection in coagulating basin；
Step S2. coagulating: it is poly- that the good aluminium polychloride of predissolve (PAC), nonionic are sequentially added into coagulating basin
The solution of acrylamide (PAM) and cationic polyacrylamide (CPAM) three kinds of substances, makes PAC, PAM, CPAM in coagulating basin
Concentration is respectively 50~80mg/L, 4~6mg/L, 2~4mg/L；Then it is sufficiently mixed under 150~200rpm speed of agitator
Reaction 15 minutes is closed, so that impurity is formed floc particle and suspends in water, obtains coagulating treated waste water；
Step S3. air-flotation process: being pressurizeed using air compressor, using pressurization after pump, the good dissolved air water of pre-debug
Operating pressure be 0.3~0.35MPa, the waste water after coagulating treatment is then delivered to dissolving, subsequently into flotation tank,
Air-flotation process is carried out, makes wadding body with bubble floating, forms dross；The clear water of lower layer's water outlet is discharged by collector pipe；
The reuse of step S4. water outlet or condensing crystallizing: checking the Baume degrees of water outlet, if Baume degrees is greater than 20oBe', will go out
Water carries out condensing crystallizing after collecting, and isolates the salt containing sodium chloride；If Baume degrees is less than 20oBe', water outlet can directly be returned
With, such as soak in advance for rawhide, in the processes such as pickling；Part effluent recycling is in air-flotation process system simultaneously.
The dehydration and drying of step S5. dross is handled: after dross is collected, being mixed in the dirt to be drained off of enterprise's sewage treatment place
In mud, then it is carried out dehydrating using conventional plate and frame filter press or centrifuge.
Embodiment 2:
Refering to the purified treatment of Fig. 2 preparing leather from goatskin factory's rawhide preimpregnation aqueous waste solution:
The filtering of step S1. immersion waste liquid: the immersion given off is given up using the rotary machine grid that rake teeth grid gap is 2mm
Liquid filtering, then by waste collection in coagulating basin；
Step S2. coagulating: it is poly- that the good aluminium polychloride of predissolve (PAC), nonionic are sequentially added into coagulating basin
The solution of acrylamide (PAM) and cationic polyacrylamide (CPAM) three kinds of substances, makes PAC, PAM, CPAM in coagulating basin
Concentration is respectively 70~90mg/L, 4~6mg/L, 3~5mg/L；Then it is sufficiently mixed under 150~200rpm speed of agitator
Reaction 10 minutes is closed, so that impurity is formed floc particle and suspends in water, obtains coagulating treated waste water；
Step S3. air-flotation process: being pressurizeed using water sprayer, using pressurization before pumping, the work of the good dissolved air water of pre-debug
Making pressure is 0.3~0.35MPa, and the waste water after coagulating treatment is then delivered to dissolving, subsequently into flotation tank, is carried out
Air-flotation process makes wadding body with bubble floating, forms dross；The clear water of the water outlet of lower layer is discharged by collector pipe；
The reuse of step S4. water outlet or condensing crystallizing: checking the Baume degrees of water outlet, if Baume degrees is greater than 20oBe', will go out
Water carries out condensing crystallizing after collecting, and isolates the salt containing sodium chloride；If Baume degrees is less than 20oBe', water outlet can directly be returned
With, such as soak in advance for rawhide, in the processes such as pickling；Part effluent recycling is in air-flotation process system simultaneously；
The dehydration and drying of step S5. dross is handled: after dross is collected, being mixed in the dirt to be drained off of enterprise's sewage treatment place
In mud, then it is carried out dehydrating using conventional plate and frame filter press or centrifuge.
Claims (8)
1. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution, it is characterised in that: successively the following steps are included: the waste liquid that soaks
The dehydration and drying processing of filtering, coagulating, air-flotation process, the reuse of water outlet or condensing crystallizing, dross, the operation of each step is such as
Under:
S1. the filtering of immersion waste liquid: the immersion waste liquid given off from rotary drum is filtered using fine fack, to remove large scale
Grain object, then by waste collection in coagulating basin；
S2. coagulating: flocculant is added into coagulating basin, and carries out being sufficiently mixed reaction under stiring, makes impurity in waste liquid
It forms floc particle to suspend in water, obtains coagulating treated waste water；
S3. air-flotation process: by coagulating, treated that waste water is delivered in the flotation tank having been turned on, and carries out air-flotation process, makes
Wadding body forms dross with bubble floating, and the clear water of lower layer's water outlet is discharged by collector pipe；
S4. the reuse being discharged or condensing crystallizing: checking the Baume degrees of water outlet, determines effluent reuse production process according to Baume degrees,
Or carry out condensing crystallizing processing；
S5. it the dehydration and drying processing of dross: after dross is collected, is incorporated in the sludge to be drained off of enterprise's sewage treatment place, so
It is carried out dehydrating afterwards using plate and frame filter press or centrifuge.
2. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S1
It is middle that immersion waste liquid is filtered using thin rotary machine grid.
3. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S2
The stirring condition of coagulating are as follows: reaction is sufficiently mixed under 50~450rpm speed of agitator 10~30 minutes.
4. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S2
Flocculant in coagulating includes: aluminium polychloride, non-ionic polyacrylamide and cationic polyacrylamide, wherein polymerizeing
Aluminium chloride be added after concentration be 30~100mg/L, nonionic polyacrylamide be added after concentration be 0.5~10mg/L, sun from
Concentration after sub- polyacrylamide is added is 0.5~10mg/L.
5. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as claimed in claim 4, it is characterised in that: the polymerization chlorine
Change after aluminium is configured to 2~3% aqueous solution and be added, the non-ionic polyacrylamide and cationic polyacrylamide are configured to
It is added after 0.1~0.3% aqueous solution.
6. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S3
Air-flotation process uses pressure air-dissolving air-float processing equipment, and pressuring method is air inlet method after pump: being led on pressure pipe using air compressor machine
Enter compressed air, enter back into dissolving, then dissolved air water enters flotation tank, carries out flotation, the work pressure of dissolved air water to coagulation water
Power is 0.2~0.5MPa.
7. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S3
Air-flotation process uses pressure air-dissolving air-float processing equipment, and pressuring method is air inlet method before pumping: being drawn air into simultaneously using water sprayer
It is mixed with water, then is sent into dissolving through water pump, then dissolved air water enters flotation tank, carries out flotation, the work of dissolved air water to coagulation water
Making pressure is 0.2~0.5MPa.
8. a kind of purifying treatment method of rawhide preimpregnation aqueous waste solution as described in claim 1, it is characterised in that: the step S4
The Baume degrees inspection of water outlet: the reuse of water outlet or condensing crystallizing if Baume degrees is greater than 20 ° of Be', will be concentrated after effluent collection
Crystallization, isolates salt；If less than 20 ° Be' of Baume degrees, during water outlet direct reuse to rawhide is processed, comprising: rawhide is pre-
Immersion, main immersion, pickling procedure；Simultaneously by part effluent recycling, and gas to be used in dissolving by entering after pump pressurization, molten gas
In floating treatment process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717863A (en) * | 2020-11-19 | 2021-04-30 | 中国恩菲工程技术有限公司 | Gas-liquid reaction system and hydrometallurgical equipment with same |
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| CN102583862A (en) * | 2012-02-22 | 2012-07-18 | 北京纬纶华业环保科技股份有限公司 | Method and system for treating saline wastewater to zero discharge and recycling |
| CN105731707A (en) * | 2016-02-22 | 2016-07-06 | 溧阳德维透平机械有限公司 | MVR processing unit and method for wastewater containing oil and salt |
| KR20170039017A (en) * | 2015-09-30 | 2017-04-10 | 에이티이 주식회사 | Advanced livestock excretions treatment system using microalgae |
| CN108585247A (en) * | 2018-05-16 | 2018-09-28 | 杭州绿夏环境科技有限公司 | Leather industry salt reuse method and salt reclaiming system |
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2018
- 2018-12-17 CN CN201811542491.7A patent/CN109678273A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583862A (en) * | 2012-02-22 | 2012-07-18 | 北京纬纶华业环保科技股份有限公司 | Method and system for treating saline wastewater to zero discharge and recycling |
| KR20170039017A (en) * | 2015-09-30 | 2017-04-10 | 에이티이 주식회사 | Advanced livestock excretions treatment system using microalgae |
| CN105731707A (en) * | 2016-02-22 | 2016-07-06 | 溧阳德维透平机械有限公司 | MVR processing unit and method for wastewater containing oil and salt |
| CN108585247A (en) * | 2018-05-16 | 2018-09-28 | 杭州绿夏环境科技有限公司 | Leather industry salt reuse method and salt reclaiming system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112717863A (en) * | 2020-11-19 | 2021-04-30 | 中国恩菲工程技术有限公司 | Gas-liquid reaction system and hydrometallurgical equipment with same |
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