CN102120664B - Process for recycling tanning waste liquid by steps - Google Patents
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Abstract
The invention provides a process for recycling tanning waste liquid by steps, which is characterized in that the waste liquid recycling is carried out by steps through main soaking, liming, deliming and softening, and chorme tanning, wherein the circulation of the waste liquid in the main soaking step is of hemicycle, and the circulation of the waste liquid in the steps of liming, deliming and softening, and chorme tanning is of totally closed circulation. By means of the process provided by the invention, waste liquid recycling is basically realized from original leather to wet blue leather, the quality of the wet blue leather is simultaneously guaranteed, the expense is not increased, the cost on chemical materials is effectively saved, and the sewage discharge is greatly decreased.
Description
Technical field
The present invention relates to leather industry waste water circulation recycling field.
Background technology
Production process from raw hide to blue skin is the heavily contaminated stage whole tanning production, and its blowdown flow rate accounts for total the more than 75% of blowdown flow rate in whole process hides process, and its water quality characteristics is to contain a large amount of complicated components and poisonous and harmful substances.Wherein contain a large amount of lime, protein, salt, grease, ammonia nitriding compound, sulfide, chromic salts, hairs, skin slag, silt etc., and COD, BOD are very high.Its pollutant kind is various, complicated, and the large and foul smelling phenomenon of water quality and quantity variation factor, is compared with the trade effluent of refractory reason.
Along with the development of green technology equipment, leather-making waste water has formed the treatment process (seeing the following form) of comparative maturity at present.But that its operational process often spends is high, efficiency is low, weak effect cannot reach real pollution treatment object.
| technique title | technical superiority | technological deficiency |
| traditional activated sludge process | this method is to BOD 5clearance is more than 90%, and COD is at 60%～80%, and colourity is at 50%～90%, and S is at 85%～98%. | high to the need water quality requirement of disposing of sewage, be not suitable with impact load, need high power and capital cost; Floor space is also large, and general enterprise is difficult to bear; Simultaneously not good to the ammonia nitrogen treatment effect in waste water. |
| biological contact oxidation process | to organic removal rate BOD 5in 95 % left and right, COD is in 92% left and right, and S is in 98% left and right. | easily produce and stop up, safeguard also more difficult.Once go wrong, system must out of servicely just can be safeguarded. |
| oxidation ditch | to BOD 5clearance is more than 95%, S at 99%～100%, SS in 75% left and right | treatment effect is unstable, is relatively suitable for the south that temperature is higher, and for the north, winter operation may have problem. |
| double-deck biological filter | to SS clearance at 95%, BOD 5at 98%, COD at 90%, Cr (III) more than 96%, S is at 96 %. | need to determine suitable reflux ratio, select suitable filtrate, working cost is larger. |
| sBR method | sBR technique is to COD, S 2-, SS, Cr clearance be respectively 93.3%, 99.0%, 90.3%, 99.4%. | working cost is larger, and the less efficiency of scale is lower, safeguards also more difficult. |
Also there is at present people to carry out cycling and reutilization to leather-making waste water, but just simply the waste water of a certain operation has been carried out to recycle, all very limited to reduction of the saving of the minimizing of quantity of wastewater effluent, material, production cost etc. like this.If want, realize the disposable whole recyclings of waste water from raw hide to all workshop sections of blue skin, but be an extremely complicated scabrous problem, and often follow the appearance of following problem: graywall rate of body weight gain, the blue skin yield of leather 1.5%-3.5% that all declines, shrinkage temperature declines 1.5 ℃-3.5 ℃, also can make blue skin grain impaired, grain chap, darkens, and even produces " hair side " phenomenon.
Summary of the invention
Object of the present invention: realize the cycling utilization of wastewater from raw hide to blue skin all process steps; particularly liming and chrome tanning workshop section; waste liquid can unlimitedly recycle; outside removing the normal volatilization under state of nature and inevitably spilling; the rate of recovery of waste liquid can reach 100%, and guarantees blue cortex amount, makes the large 1-3.5% of blue skin yield of leather; the high 3-12 of shrinkage temperature ℃ (comparing with common process), has obtained the blue skin of high-quality.The finished product leather property indices of producing thus all reaches requirement, and effectively reduces finished leather loose side rate, has improved the degree of packing of finished leather, and can realize and save material 10-55%, and indivedual materials can realize saves more than 90%, reduces sewage discharge 70%-85%.
Technical scheme of the present invention is as follows:
A kind of process for recycling waste leather-making liquid step by step, it is characterized in that proceed step by step waste liquid cycling and reutilization in main immersion, liming, deashing and softening, chrome tanning process, wherein the circulation of soaking process waste liquid is half circulation, the circulation of liming, deashing and softening, chrome tanning process waste liquid is closed circulating, and described technique comprises the steps:
(1) the waste liquid cycling and reutilization of main soaking process: main immersion waste liquid liquid storage tank is set on main soaking drum side, in the waste liquid elimination waste liquid of next autonomous soaking process, after solid substance, enter main immersion waste liquid liquid storage tank, stir, to be ready for use on down the pre-immersion of batch raw hide; The technique of utilizing main immersion waste liquid to carry out pre-immersion is: with raw hide weighing scale, the liquor ratio of take is become owner of immersion waste liquid as 1.8-2.2 adds, add 0.2-0.4% sterilant, rotary drum rotates 15 minutes, then add 0.3-0.5% Soaking, 0.2-0.5% grease-removing agent, rotary drum rotates 20 minutes, stops 40 minutes, turn and stop in conjunction with carrying out 4 times, the discharge of wastewater after pre-immersion finishes falls;
(2) the waste liquid cycling and reutilization of liming operation: on liming rotary drum side, Lime Liquor liquid storage tank is set, from entering Lime Liquor liquid storage tank after solid substance in the Lime Liquor elimination waste liquid of liming operation, stirs, to be ready for use on down the liming of batch skin; The technique of utilizing Lime Liquor to carry out liming is: with raw hide weighing scale, add 30-90% Lime Liquor, 0.15-0.3% grease-removing agent, 0.1-0.2% Sodium sulfhydrate, rotary drum rotates 30 minutes, stops 5 minutes, turns and stops in conjunction with carrying out 4 times; Add 30-90% Lime Liquor, 0.7-0.8% lime, 0.3-0.4% sodium sulphite, 0.2-0.5% Sodium sulfhydrate, 1.2-1.5% again and must remove from office treasured, rotary drum rotates 40 minutes, stops 20 minutes, turns and stops in conjunction with carrying out 2 times; Add 20-60% Lime Liquor, 0.2-0.5% sodium sulphite, 0.1-0.3% sodium hydroxide, 0.1-0.15% liming enzyme, 0.6-0.8% again and must remove from office treasured, rotary drum rotates 60 minutes, stops 30 minutes, turns and stops in conjunction with carrying out 2 times; Add 10-20% clear water, 1-2.0% lime, turn and stop each 30 minutes, then often turn 5 minutes and stop 25 minutes, carry out 2 times, then every rotation stops 90 minutes for 5 minutes, spends the night;
(3) the waste liquid cycling and reutilization of deashing and softening operation: at the other deashing and softening waste liquid liquid storage tank that arranges of deashing and softening rotary drum, from entering deashing and softening waste liquid liquid storage tank after solid substance in the waste liquid elimination waste liquid of deashing and softening operation, stir, to be ready for use on down the deashing and softening of batch skin; The technique of utilizing deashing and softening waste liquid to carry out deashing and softening is: with graywall weighing scale, liquor ratio is 1-1.5, add 0.1-0.3% grease-removing agent, 0.4-0.8% deliming agent, 0.8-1.2% ammonium sulfate, 0.1-0.4% hydrochloric acid, rotary drum rotates 30-50 minute, add 0.15-0.3% macerating enzyme, rotate 25-40 minute;
(4) the waste liquid cycling and reutilization of chrome tanning process: on chrome tanning rotary drum side, chroming waste liquor liquid storage tank is set, this pond should be deep to underground 3-6 rice in order to temperature control, and preferably has standby pool.From entering chroming waste liquor liquid storage tank after solid substance in the waste liquid elimination waste liquid of chrome tanning process, after cooling, with acid, regulate the pH value of chroming waste liquor to 0.7-1.4, stir, to be ready for use on down the chrome tanning of batch skin, preferably rear use overnight of chroming waste liquor; The technique of utilizing chroming waste liquor to carry out chrome tanning is: with graywall weighing scale, add 20-100% chroming waste liquor, 0.2-0.3% mould inhibitor, 0-3% Industrial Salt, rotary drum rotates 10 minutes, 0.3-0.5% formic acid, rotates 0.3-0.5% sulfuric acid 20 minutes, dividing two to three times equally adds, every minor tick 10 minutes, rotary drum rotates 70-100 minute, adds 0.4-0.6% cationic fat liquor, rotate 30 minutes, stop 1-2 hour; Add 1-2% chromium powder, rotary drum rotates 30 minutes, then adds 1.5-3.5% chromium powder, rotates 1 hour, add 0.3-0.7% sodium formiate, turn 30 minutes, add 0.3-0.5% to carry alkaline agent, rotate 3.5-4.5 hour, after be warming up to 28-32 ℃, add 20-80% chroming waste liquor, rotate 3-5 hour.
In above-mentioned technique, each liquid storage tank is equipped with whipping appts.Graywall after liming carries out fleshing and split, and the waste collection producing in fleshing and split process enters Lime Liquor liquid storage tank in order to cycling and reutilization.Micromicro after deashing and softening operation and chrome tanning process processing is to remove conventional water-washing step from.
Initial waste liquid used in the present invention comes from respectively traditional main immersion, liming, deashing and softening, chrome tanning process, and the formation situation of various waste liquids is well known by persons skilled in the art.In general, in main immersion waste liquid, contain immersion agent, NaCl, Na
2cO
3, grease-removing agent, grease and degradation production thereof, hair, keratin protein, Saliva Orthana, meat, blood etc., wherein, generally, in waste liquid, residual grease-removing agent content is generally the 15-30% of initial content, in waste liquid, residual immersion agent content is generally the 15-25% of initial content, residual Na in waste liquid
2cO
3content is generally the 30-50% of initial content; In Lime Liquor, contain grease and degradation production thereof, salt, lime, auxiliary liming agent, S
2-, OH
-, Na
+, Ca
++, protein and degradation production, enzyme and amine substance etc., wherein, generally, in waste liquid, residual lime is generally the 37-55% of initial content, residual Na in waste liquid
2s content is generally 2.4-3.2g/l; In deashing and softening waste liquid, contain protein and degradation production thereof, deliming agent, grease-removing agent, grease and degradation production thereof, enzyme and ammonium salt, amine substance etc., wherein in waste liquid, residual enzyme content is generally the 30-50% of initial content, and in waste liquid, residual amounts of ammonium salt is generally the 30-40% of initial content; In chroming waste liquor, contain Cr
3+, Cl
-, SO
4 2-, acid group, protein and degradation production, grease and degradation production thereof etc., wherein residual Cr in waste liquid
3+be generally 2.8-3.2g/l, Cl
-be generally 7-15g/l, in waste liquid, residual acid group content is generally the 30-45% of initial content.
Preferably, main soaking process and liming operation can adopt same rotary drum, on rotary drum side, main immersion waste liquid liquid storage tank and Lime Liquor liquid storage tank are set respectively, in the mode of valve, control rotary drum to the discharging of waste liquid of each liquid storage tank.Specifically, when main immersion and liming are when with a rotary drum, valve 1 is set on rotary drum, for main immersion discharging of waste liquid is arrived to main immersion waste liquid liquid storage tank, meanwhile, valve 2 is set on rotary drum, for Lime Liquor being discharged into Lime Liquor liquid storage tank.While discharging main immersion waste liquid, valve 1 is opened, and valve 2 is closed, and waste liquid is discharged into main immersion waste liquid liquid storage tank through shunt conduit; During discharge Lime Liquor, valve 1 is closed, and valve 2 is opened, and waste liquid is discharged into Lime Liquor liquid storage tank through shunt conduit.
Similarly, deashing and softening operation and chrome tanning process also can adopt same rotary drum, on rotary drum side, deashing and softening waste liquid liquid storage tank and chroming waste liquor liquid storage tank are set respectively, in the mode of valve, control rotary drum to the discharging of waste liquid of each liquid storage tank.Specifically, when deashing and softening and chrome tanning are when with a rotary drum, valve 3 is set on rotary drum, be used for deashing and softening discharging of waste liquid to deashing and softening waste liquid liquid storage tank, meanwhile, valve 4 is set on rotary drum, for chroming waste liquor being discharged into chroming waste liquor liquid storage tank.During discharge deashing and softening waste liquid, valve 3 is opened, and valve 4 is closed, and waste liquid is discharged into deashing and softening waste liquid liquid storage tank through shunt conduit; During discharge chroming waste liquor, valve 3 is closed, and valve 4 is opened, and waste liquid is discharged into chroming waste liquor liquid storage tank through shunt conduit.
In waste liquid cycling and reutilization process of the present invention, for the operation of liming, deashing and softening, these totally-enclosed waste liquid circulations of chrome tanning, can regularly to waste liquid, clean processing according to the sliminess of waste liquid in each waste liquid liquid storage tank, remove solids wherein, liquid continues cycling and reutilization.For example, by the mode of press filtration, waste liquid is cleaned to processing, through the isolated solids of press filtration, be used for filling out hole or brickmaking or other purposes, isolated wastewater collection enters each waste liquid liquid storage tank in order to cycling and reutilization.
Waste liquid is cleaned to treatment cycle can be adjusted according to concrete production status, excessive when the sliminess of waste liquid, for example, make pumping Efficiency Decreasing, having limited the dissolving dispersion of skin material etc. of waste liquid, so that while being unfavorable for that leather is produced, can clean processing.For concrete waste liquid, clean treatment cycle, those skilled in the art can rule of thumb suitably adjust.Generally, for the medium-sized tannery that adopts traditional technology, Lime Liquor liquid storage tank can be every cleaning in 20-40 days once, and deashing and softening waste liquid liquid storage tank can be every cleaning in 30-50 days once, and chroming waste liquor liquid storage tank can be every cleaning in 40-60 days once.
" must remove from office treasured " used in the present invention is Bao Sika company product, is senior alcohol ether and salts substances, has been widely used in the art, can or directly from Bao Sika (Shangqiu) Chemical Co., Ltd., obtain by Chemical market.
The present invention has following beneficial effect:
The present invention has realized in process hides the waste water circulation of each workshop section recycling from raw hide to wet blue substantially, and except immersion waste liquid is half recycle, the waste liquid of other operation has been realized whole recycles, and can unlimitedly circulate, sewage effluent, particularly utilizes useless chrome liquor hardly, and the moisturizing in later stage heats up than the few 7-10 of common process ℃ left and right, obtained the blue skin of high-quality, for traditional technology, can save following material: grease-removing agent 15-30%, immersion agent 15-25%, soda ash 30-50%, Na
2s35-50%, NaHS 30-45%, lime 37-55%, liming enzyme 20-30%, auxiliary liming agent 10-20%, ammonium sulfate 30-40%, deliming agent 15-20%, macerating enzyme 30-50%, formic acid 30-45%, sulfuric acid 30-50%, salt 70-100%, chromium powder 35-55%.Certainly concrete technology is different, and the amount of saving material is also slightly different, but in general, can realize and save material 15-55%, reduces sewage discharge 70%-85%, and wet blue yield of leather increases 1-3.5%; The high 3-12 ℃ of shrinkage temperature, has obtained high-quality wet blue.The finished product leather property indices of producing thus all reaches requirement, and effectively reduces finished leather loose side rate, has improved the degree of packing of finished leather.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet according to process for recycling waste leather-making liquid step by step of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
Embodiment 1
As shown in the figure, in soaking process, raw hide carries out after main immersion, after waste liquid elimination solid substance, be discharged into main immersion waste liquid liquid storage tank, with agitator, stir, then by lye pump, extract out and be drained into pre-soaking drum, the technique of utilizing main immersion waste liquid to carry out pre-immersion is: with raw hide weighing scale, liquor ratio is 2, adds 0.2% sterilant, rotary drum rotates 15 minutes, then add 0.35% Soaking, 0.2% grease-removing agent, rotary drum rotates 20 minutes, stops 40 minutes, turn and stop in conjunction with carrying out 4 times, the discharge of wastewater after pre-immersion finishes falls.In liming operation, after Lime Liquor elimination solid substance, enter Lime Liquor liquid storage tank, stir, then by lye pump, extract out and be drained into liming rotary drum, utilize Lime Liquor to carry out liming technique to be: with raw hide weighing scale, add 70% Lime Liquor, 0.2% grease-removing agent, 0.1% Sodium sulfhydrate, rotary drum rotates 30 minutes, stop 5 minutes, turn and stop in conjunction with carrying out 4 times; Add 70% Lime Liquor, 0.7% lime, 0.3% sodium sulphite, 0.2% Sodium sulfhydrate, 1.0% again and must remove from office treasured, rotary drum rotates 40 minutes, stops 20 minutes, turns and stops in conjunction with carrying out 2 times; Add 50% Lime Liquor, 0.3% sodium sulphite, 0.3% sodium hydroxide, 0.15% liming enzyme, 0.6% again and must remove from office treasured, rotary drum rotates 60 minutes, stops 30 minutes, turns and stops in conjunction with carrying out 2 times; Add 20% clear water, 1.5% lime, turn and stop each 30 minutes, then often turn 5 minutes and stop 25 minutes, carry out 2 times, then every rotation stops 90 minutes for 5 minutes, spends the night; Graywall is carried out to fleshing split, then carry out de-ization of deliming.In deashing and softening operation, after deashing and softening waste liquid elimination solid substance, enter deashing and softening waste liquid liquid storage tank, then by lye pump, extract out and be drained into deashing and softening rotary drum, the technique of utilizing waste liquid to carry out deashing and softening is: liquor ratio is 1, add 0.2% grease-removing agent, 0.6% deliming agent, 1.2% ammonium sulfate, 0.4% hydrochloric acid, rotary drum rotates 40 minutes, adds 0.25% macerating enzyme, rotates 30 minutes.In chrome tanning process, after useless chrome liquor elimination solid substance, be drained into liquid storage tank, with sulfuric acid, adjusting its pH value is 1-1.2, stir, then by acid proof pump, extract out and flow into chrome tanning rotary drum, the technique of utilizing chroming waste liquor to carry out chrome tanning is: 70% useless chrome liquor, 0.25% mould inhibitor, 3% salt, rotary drum rotates 10 minutes, 0.6% formic acid (diluting its concentration to 5% left and right with useless chrome liquor), rotate 20 minutes, 0.6% sulfuric acid (diluting its concentration to 5% left and right with useless chrome liquor), dividing three times equally adds, at interval of 10 minutes, add once, rotate 90 minutes, 0.5% cationic fat liquor, rotate 30 minutes, stop 1-2 hour, 2.5% chromium powder, rotates 30 minutes, and 3% chromium powder rotates 1 hour, and 0.5% sodium formiate, turns 30 minutes, and 0.4% carries alkaline agent, rotate 4 hours, after be warming up to 35 ℃, add 50% useless chrome liquor, rotate 3 hours.
The shrinkage temperature that records wet blue is 105 ℃, and wet blue color is blue, and grain is careful.
The circulation waste liquid of above-mentioned liming, deashing and softening, chrome tanning process optionally regularly carries out press filtration processing, and the waste liquid that press filtration obtains is recovered into corresponding waste liquid pool and continues cycling and reutilization, and the useless solid thing that press filtration obtains is cheated or other for filling out.
In the situation that not departing from spirit of the present invention or substantive features, can implement the present invention with other form, with reference to claim but not above-mentioned specification sheets, as indication scope of the present invention.
Claims (9)
1. a process for recycling waste leather-making liquid step by step, it is characterized in that proceed step by step waste liquid cycling and reutilization in main immersion, liming, deashing and softening, chrome tanning process, wherein the circulation of main soaking process waste liquid is half circulation, the circulation of liming, deashing and softening, chrome tanning process waste liquid is closed circulating, and described technique comprises the steps:
(1) the waste liquid cycling and reutilization of main soaking process: main immersion waste liquid liquid storage tank is set on main soaking drum side, in the waste liquid elimination waste liquid of next autonomous soaking process, after solid substance, enter main immersion waste liquid liquid storage tank, stir, to be ready for use on down the pre-immersion of batch raw hide; The technique of utilizing main immersion waste liquid to carry out pre-immersion is: with raw hide weighing scale, the liquor ratio of take is become owner of immersion waste liquid as 1.8-2.2 adds, add 0.2-0.4% sterilant, rotary drum rotates 15 minutes, then add 0.3-0.5% Soaking, 0.2-0.5% grease-removing agent, rotary drum rotates 20 minutes, stops 40 minutes, turn and stop in conjunction with carrying out 4 times, the discharge of wastewater after pre-immersion finishes falls;
(2) the waste liquid cycling and reutilization of liming operation: on liming rotary drum side, Lime Liquor liquid storage tank is set, from entering Lime Liquor liquid storage tank after solid substance in the Lime Liquor elimination waste liquid of liming operation, stirs, to be ready for use on down the liming of batch skin; The technique of utilizing Lime Liquor to carry out liming is: with raw hide weighing scale, add 30-90% Lime Liquor, 0.15-0.3% grease-removing agent, 0.1-0.2% Sodium sulfhydrate, rotary drum rotates 30 minutes, stops 5 minutes, turns and stops in conjunction with carrying out 4 times; Add 30-90% Lime Liquor, 0.7-0.8% lime, 0.3-0.4% sodium sulphite, 0.2-0.5% Sodium sulfhydrate, 1.2-1.5% again and must remove from office treasured, rotary drum rotates 40 minutes, stops 20 minutes, turns and stops in conjunction with carrying out 2 times; Add 20-60% Lime Liquor, 0.2-0.5% sodium sulphite, 0.1-0.3% sodium hydroxide, 0.1-0.15% liming enzyme, 0.6-0.8% again and must remove from office treasured, rotary drum rotates 60 minutes, stops 30 minutes, turns and stops in conjunction with carrying out 2 times; Add 10-20% clear water, 1-2.0% lime, turn and stop each 30 minutes, then often turn 5 minutes and stop 25 minutes, carry out 2 times, then every rotation stops 90 minutes for 5 minutes, spends the night;
(3) the waste liquid cycling and reutilization of deashing and softening operation: at the other deashing and softening waste liquid liquid storage tank that arranges of deashing and softening rotary drum, from entering deashing and softening waste liquid liquid storage tank after solid substance in the waste liquid elimination waste liquid of deashing and softening operation, stir, to be ready for use on down the deashing and softening of batch skin; The technique of utilizing deashing and softening waste liquid to carry out deashing and softening is: with graywall weighing scale, liquor ratio is 1-1.5, add 0.1-0.3% grease-removing agent, 0.4-0.8% deliming agent, 0.8-1.2% ammonium sulfate, 0.1-0.4% hydrochloric acid, rotary drum rotates 30-50 minute, add 0.15-0.3% macerating enzyme, rotate 25-40 minute;
(4) the waste liquid cycling and reutilization of chrome tanning process: at the other chroming waste liquor liquid storage tank that arranges of chrome tanning rotary drum, this pond should be deep to underground 3-6 rice in order to temperature control, and there is standby pool, from entering chroming waste liquor liquid storage tank after solid substance in the waste liquid elimination waste liquid of chrome tanning process, after cooling, with acid, regulate the pH value of chroming waste liquor to 0.7-1.4, stir, to be ready for use on down the chrome tanning of batch skin, chroming waste liquor use overnight is better than use not overnight; The technique of utilizing chroming waste liquor to carry out chrome tanning is: with graywall weighing scale, add 20-100% chroming waste liquor, 0.2-0.3% mould inhibitor, 0-3% Industrial Salt, rotary drum rotates 10 minutes, 0.3-0.5% formic acid, rotates 0.3-0.5% sulfuric acid 20 minutes, dividing two to three times equally adds, every minor tick 10 minutes, rotary drum rotates 70-100 minute, adds 0.4-0.6% cationic fat liquor, rotate 30 minutes, stop 1-2 hour; Add 1-2% chromium powder, rotary drum rotates 30 minutes, then adds 1.5-3.5% chromium powder, rotates 1 hour, add 0.3-0.7% sodium formiate, turn 30 minutes, add 0.3-0.5% to carry alkaline agent, rotate 3.5-4.5 hour, after be warming up to 28-32 ℃, add 20-80% chroming waste liquor, rotate 3-5 hour.
2. process for recycling waste leather-making liquid step by step as claimed in claim 1, is characterized in that each liquid storage tank is provided with whipping appts.
3. process for recycling waste leather-making liquid step by step as claimed in claim 1, the graywall after liming carries out fleshing and split, and the waste collection producing in fleshing and split process enters Lime Liquor liquid storage tank in order to cycling and reutilization.
4. process for recycling waste leather-making liquid step by step as claimed in claim 1, it is characterized in that main soaking process and liming operation adopt same rotary drum, on rotary drum side, main immersion waste liquid liquid storage tank and Lime Liquor liquid storage tank are set respectively, in the mode of valve, control rotary drum to the discharging of waste liquid of each liquid storage tank.
5. process for recycling waste leather-making liquid step by step as claimed in claim 1, it is characterized in that deashing and softening operation and chrome tanning process adopt same rotary drum, on rotary drum side, deashing and softening waste liquid liquid storage tank and chroming waste liquor liquid storage tank are set respectively, in the mode of valve, control rotary drum to the discharging of waste liquid of each liquid storage tank.
6. process for recycling waste leather-making liquid step by step as claimed in claim 1, is characterized in that regularly waste liquid being cleaned to processing according to the sliminess of waste liquid in each waste liquid liquid storage tank, removes solids wherein, and liquid continues cycling and reutilization.
7. process for recycling waste leather-making liquid step by step as claimed in claim 6, it is characterized in that, by the mode of press filtration, waste liquid is cleaned to processing, through the isolated solids of press filtration, be used for filling out hole or brickmaking or other purposes, isolated wastewater collection enters each waste liquid liquid storage tank in order to cycling and reutilization.
8. process for recycling waste leather-making liquid step by step as claimed in claim 1, is characterized in that the skin after deashing and softening operation and chrome tanning process processing is removed conventional water-washing step from.
9. process for recycling waste leather-making liquid step by step as claimed in claim 1, is characterized in that at the other standby pool that arranges again of chroming waste liquor liquid storage tank.
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| US9776887B2 (en) | 2013-12-04 | 2017-10-03 | Zhuangdou Zhang | Tannery process with effluent recycling |
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| CN102535197A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process indefinitely recycling waste liquid to perform dyeing |
| CN103525955A (en) * | 2013-04-18 | 2014-01-22 | 张壮斗 | Tanning waste liquor stepwise recycling process with good effects |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9776887B2 (en) | 2013-12-04 | 2017-10-03 | Zhuangdou Zhang | Tannery process with effluent recycling |
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| CN102120664A (en) | 2011-07-13 |
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