CN105695642B - A kind of effective reduction waste discharge COD fur tanning method - Google Patents

Abstract

The invention provides a kind of effective reduction waste discharge COD fur tanning method, comprise the following steps：(A) the raw material fur of high-quality is selected, after immersion is handled, carries out using lipase concentration in degreasing, skimming processes for 2 3g/L, Ai Lite degreasings agent concentration is the 0.5 1g/L aqueous solution, the quality of the aqueous solution and the quality of fur are 20 30:1；(B) by fur that above-mentioned steps are treated again by softening pickling, tanning, after cleaning, produce.The fur tanning method of the embodiment of the present invention can replace the enzyme preparation of degreasing agent by using a kind of, so as to largely reduce in big production because the pollution that degreasing is caused to water, production cost is greatly reduced, technological operation is simplified, COD/BOD discharge is reduced.

Description

A kind of effective reduction waste discharge COD fur tanning method

Technical field

The present invention relates to animal fur manufacture field, in particular to a kind of effective reduction waste discharge COD fur Process for tanning.

Background technology

Stabilization, fast development with World Economics, the living standard of people are improved constantly, the past as rich merchant noble as The fur dress ornament levied, has gradually entered into increasing fashional consumption person's life, and the fashion of current fur product is more and more stronger, Its popular pattern is more and more.Meanwhile, the fashion design of FUR GARMENT style, a large amount of uses of other clothes fur edgings, Also the consumption figure cumulative year after year of fur is made.And the trend of consumer groups' more and more rejuvenation with FUR GARMENT, it is personalized As new pattern requirement.The rag trade with developing that reaches its maturity leads the trend of fashionable life, gives leather and fur processing industry to provide Infinite commercial opportunities, while it is also proposed higher requirement to leather and fur dyeing and finishing processing, leather and fur processing industry relies on leather and fur chemical industry Technological progress occupies more and more important position in the apparel industry of riot of color.

Wherein, it is tanning processes to carry out the essential link of fur manufacturing, and tanning can make between collagen polypeptide chain Generate cross-bond, add the stability of collagen structure, improve shrinkage temperature and hydrothermal stability, improve antiacid, alkali, The ability of the chemicals such as enzyme.General rawhide is needed before tanning by a series of preparatory process such as immersion, degreasing, softening, pickling, Current fur market is mostly used for using the special degreasing agent of fur (surfactant) in the common process for making fur Degreasing is carried out to raw hide；The indexs such as COD, BOD in substantial amounts of pollution, waste water can be produced by carrying out degreasing to fur using degreasing agent Severe overweight, causes the cost in later stage sewage disposal higher.

In view of this, it is special to propose the present invention.

The content of the invention

It is an object of the invention to provide a kind of effective reduction waste discharge COD fur tanning method, by using one The enzyme preparation of degreasing agent can be replaced by planting, and the enzyme preparation has certain removal effect to grease so that dermatotome grease greatly reduces, Original degreasing agent pollution on the environment can also be greatly reduced by acting on this process using the enzyme preparation, so that in very great Cheng Reduce in big production because the pollution that degreasing is caused to water, greatly reduces production cost, simplify technological operation, drop on degree Low COD, BOD discharge.

In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：

Waste discharge COD fur tanning method can be effectively reduced the embodiments of the invention provide a kind of, including it is as follows Step：

(A) the raw material fur of high-quality is selected, after immersion is handled, carries out using lipase dense in degreasing, skimming processes Spend for 2-3g/L, Ai Lite degreasings agent concentration is the 0.5-1g/L aqueous solution, and the quality of the aqueous solution and the quality of fur are 20-30:1；

(B) by fur that above-mentioned steps are treated again by softening pickling, tanning, after cleaning, produce.

In the prior art, tanning is to produce to cause substantial amounts of discharge of wastewater, so as to pollute environment, jeopardizes the body of people In heart health, every preparation especially before tanning, the degreasing agent used in skimming processes carries out meeting after degreasing to fur Produce COD, BOD severe overweight in substantial amounts of waste water, waste water, in addition it is also necessary to can be only achieved discharge after subsequently being administered to waste water Standard, virtually adds running cost, and also operating personnel and operating environment are polluted, the theory phase with environmental protection Run counter to.The present invention can effectively reduce waste discharge COD for the technical problem for effectively solving to appear above there is provided one kind Fur tanning method, lipase is specially with the addition of in skimming processes to reduce the consumption of degreasing agent itself, lipase is this Enzyme preparation has certain removal effect to grease so that dermatotome grease greatly reduces, and is easy to being smoothed out for follow-up tanning processes, Certain maintenance action can also be played to dermatotome, because the addition of lipase greatly reduces the addition of original degreasing agent, from And pollution of the degreasing agent to environment is reduced, the pollution that the degreasing of fur manufacturing field is caused to water is largely reduced, is had Effect reduces COD, BOD discharge, decreases the follow-up running cost for administering sewage, saves manpower and materials.In addition, it is necessary to note Meaning be addition lipase consumption, the concentration of the Ai Lite degreasing agents on the premise of without lipase in the aqueous solution needs 2-3g/L is reached, but the present invention exactly with the addition of lipase, the control of Ai Lite degreasings agent concentration can expire in 0.5-1g/L Sufficient degreasing requirement, the concentration of certain lipase is also to find control in this suitable scope by repeatedly practising, Ji Neng great The big oil quantity that reduces does not interfere with the glossiness of dermatotome in itself again, therefore concentration range needs to hold suitably.Preferably, degreasing In the aqueous solution used in journey, lipase concentration is 2.5-2.8g/L, and Ai Lite degreasings agent concentration is 0.7-0.9g/L, optimal , lipase concentration is 2.7g/L, and Ai Lite degreasings agent concentration is 0.8g/L.Lipase concentration can also take 2.1g/L, 2.2g/ L, 2.3g/L, 2.6g/L, 2.7g/L, 2.9g/L etc..The mass ratio of the also aqueous solution and fur needs to be strict controlled in 20-30: 1, this parameter is relevant except the species of the fur with selection, alsos for that fur can be sufficiently impregnated to and will not wasted medicament, Mutually balanced each other so as to be reached between both.

In addition, two important operating parameters of skimming processes, skimming temp directly decides whole degreasing with degreasing time Carry out degree, skimming temp control is at 30-40 DEG C, and degreasing time control is 32-38 in 60-90min, preferably skimming temp DEG C, degreasing time is 70-80min, and skimming temp can also be 33 DEG C, 34 DEG C, 35 DEG C, 36 DEG C etc., and time of degreasing can be with For 65min, 67min, 69min, 72min, 75min etc..Degreasing time it is unsuitable it is oversize also should not be too short, these operating parameters are Performance according to fur dermatotome itself carries out putting into practice what is obtained, dermatotome can be caused durable in itself, improves dermatotome in itself Performance will not cause dermatotome by any infringement again, it is therefore desirable to which control is under the conditions of suitable skimming temp and degreasing time.

Except skimming processes use specific degreasing agent, immersion process of the invention, which have also been made, to be correspondingly improved, at immersion Reason process includes immersion, main immersion and process of soaking again, wherein again in the medicament aqueous solution used in immersion process, sodium chloride is dense Spend for 20-30g/L, Ai Lite concentration of wetting agent is 1.5-2ml/L, and lipase concentration is 1-2g/L.It can be seen that during multiple immersion Also it specially with the addition of lipase, although levels are not so good as concentration height in above skimming processes, but can also aid in playing degreasing Process so that degreasing is more thorough.The mass ratio of general the medicament aqueous solution soaked again and fur is controlled in 20-30:1, just Get well and fur is sufficiently soaked to and will not wasted medicament.

The temperature of pickling is preferably controlled between 30-40 DEG C, and the step of pickling preferably divides three phases to carry out, and first Stage uses sodium chloride concentration for 50-60g/L, and prestige this degreasing agent JA-50 concentration is 0.5-0.7ml/L, and formic acid concn is 2- The 3ml/L aqueous solution, interval agitation 60-80min；Second stage adds Ai Lite macerating enzymes BRH in aqueous so that its is dense Spend for 1-2g/L, interval agitation 2-3h；Phase III adds Weiler fatting agent FNP in aqueous so that its concentration is 1-2ml/ L, addition sulfuric acid so that its concentration be 1-2ml/L, intermittently stir and stand more than 12h, first salt, degreasing agent and formic acid composition Mixed aqueous solution in intermittently agitation a period of time, then above reagent constitute mixed solution in add Ai Lite macerating enzymes, Finally addition sulfuric acid continues to stir, so as to complete whole pickling process step, the concentration of the reagent of each step has certain It is in same mixed aqueous solution in fact it is required that, it is necessary to control in suitable scope, it is seen that although being divided into three phases Carry out, simply with the continuous progress of acid soaking step, different medicaments are added successively, the order of addition of medicament is also to have specific It is required that, because if order of addition may upset being normally carried out for whole process for tanning before and after reverse.Different medicaments exist It is to have suitable area requirement that concentration in the aqueous solution, which also has,.It is more excellent, second stage pickling process stood after finishing 12h with On be warming up to again 30-40 DEG C progress phase III pickling process.

It is that tanning creates advantage, tanning by the preparation of the steps such as the immersion before tanning, degreasing, pickling The effect of preceding preparation is mainly reflected in the following aspects：1) discommodity put on such as hypodermis, grease, dirty is removed Thing, preserver, some skins end to end etc.；2) the raw material skin moisture and moisture by preservative treatment are made in intracutaneous distribution feelings Condition, the structure of hide fiber return to fresh hide state；3) intracutaneous interfibrillar substance, destruction elastomer and musculature, pine are removed Dissipate collagenous fibres.

It is exactly important tanning processes, the temperature control of tanning after the preparations such as immersion, degreasing, pickling are passed through Between 30-40 DEG C, the too high color and luster that can influence fur of temperature, feel and mechanical performance.The step of tanning, specifically includes：First It is that 0.5-2ml/L, Weiler fatting agent FLH concentration are 1- for 50-60g/L, prestige this degreasing agent JA-50 concentration to use sodium chloride concentration 2ml/L aqueous solution interval agitation 60-80min, then prestige this chrome and aluminium tanning agent AC is added so that its concentration is 5-6g/L, addition chromium powder So that its concentration is 6-7g/L, interval agitation more than 90min, then stand more than 12h.First use salt, degreasing agent and fatting agent The mixed aqueous solution dipping of formation carries out agitation tan, then adds chrome and aluminium tanning agent, chromium powder in aqueous again so that this chromium of prestige The concentration of aluminium tanningagent AC in aqueous is controlled in 5-6g/L, and the concentration of chromium powder in aqueous is controlled in 6-7g/L, is had The chrome tanning of effect is so that fur is converted into bark, the performance of raising each side.

Finally, stand after more than 12h, addition Ai Lite auxiliary tanning agents B is playing the work that helps tan so that its concentration is 2-3g/L With simultaneously by the pH of system regulation between 3.8-4.0, reaching the condition that is more suitable for tan.

Step linking is close before and after the fur tanning method of the embodiment of the present invention, and each step is by largely putting into practice optimization Go out optimal operating condition, it is therefore desirable to implement to operate in strict accordance with the solution of the present invention, the medicament involved by above step is equal Produced by Fanbo Chemicals Co., Ltd..

Compared with prior art, beneficial effects of the present invention are：

(1) the invention provides a kind of effective reduction waste discharge COD fur tanning method, preparation method is simple, behaviour Facilitate, cost is low, process stabilizing, step linking is close before and after process, and each technique operating parameter is reasonable in design, specifically Need to carry out in strict accordance with the operating procedure of the present invention during operation, step is unable to tandem and overturned, and can not lack any one Individual processing step, this process is highly subsequently used for reference, with the meaning being widely popularized；

(2) the fur skin base made using the process for tanning of the present invention can reach the blue skin requirement made by common process, It is plentiful and the fur made using the technique is more soft, improve the added value of fur itself, most important be can The water pollution produced in common process is reduced, so as to reduce in a large amount of expenses produced by processing water pollution；

(3) the invention by using a kind of can replace the enzyme preparation of degreasing agent, and the enzyme preparation has to grease Certain removal effect so that dermatotome grease greatly reduces, and original can also be greatly reduced by acting on this process using the enzyme preparation There is degreasing agent pollution on the environment, so as to largely reduce in big production because the dirt that degreasing is caused to water Dye, greatly reduces production cost, simplifies technological operation, reduce COD, BOD discharge, and enzyme preparation cost itself It is low, cost of material is reduced, broader economic benefit is created, the foundation referred to is provided for subsequent operation.

Embodiment

Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the present invention.It is unreceipted specific in embodiment Condition person, the condition advised according to normal condition or manufacturer is carried out.Agents useful for same or the unreceipted production firm person of instrument, be The conventional products that can be obtained by commercially available purchase.

Embodiment 1

The fur tanning method of the present embodiment is carried out in accordance with the following steps：

1) the raw material skin of high-quality is selected, deburring is gone end to end, batching is weighed；

2) pre- immersion：It is normal temperature in temperature, liquor ratio is 20 using paddle-tumble:1 (being calculated by tare weight), Ai Lite wetting agents HAC 1ml/L, preservative 0.3g/L, soak 3-4h；Main immersion：Temperature is normal temperature, and liquor ratio is 20:1, Ai Lite wetting agent HAC 1ml/ L, interval stroke is stayed overnight, secondary sunrise skin, after cropping fleshing is weighed, is soaked again：Liquor ratio is 20:1, sodium chloride 20g/L, Ai Li Special wetting agent HAC 1.5ml/L, lipase 1g/L, slip-stick, overnight rear and fleshing, deburring；

3) degreasing：Temperature is 30 DEG C, and liquor ratio is 20:1, lipase 2g/L, Ai Lite degreasing agent H 0.5g/L, stroke 60- 90min, goes out skin, washes after-tack pickling：Temperature is 30 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 50g/L, prestige JA- It is quiet overnight after 500.5ml/L, formic acid 2.5ml/L interval stroke 60min, Ai Lite macerating enzyme BRH 1.5g/L, interval stroke 2h Put more than 12h；Next day is heated up 30-40 DEG C, and Weiler fatting agent FNP1ml/L, sulfuric acid 1.2ml/L, interval are added after stroke 30min Stroke, overnight, m seq goes out skin；

4) tanning：Temperature is 30 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 50g/L, prestige JA-500.5ml/L, Weiler Chromium powder 6g/ is added after fatting agent FLH 1ml/L, stroke 60min, prestige this chrome and aluminium tanning agent AC 5g/L, chromium powder 6g/L, stroke 90min L, interval stroke, overnight；Next day adds Ai Lite auxiliary tanning agent B 2g/L, pH regulations and arrives 3.8-4.0 or so, and interval stroke is stayed overnight, Secondary sunrise skin；

5) skin is washed：Temperature is 35 DEG C, and liquor ratio is 30:1, formic acid 0.3ml/L, prestige this degreasing agent JA-500.5wt%, stroke Go out skin control water after 20min.

Embodiment 2

The fur tanning method of the present embodiment is carried out in accordance with the following steps：

1) the raw material skin of high-quality is selected, deburring is gone end to end, batching is weighed；

2) pre- immersion：It is normal temperature in temperature, liquor ratio is 20 using paddle-tumble:1 (being calculated by tare weight), Ai Lite wetting agents HAC 1ml/L, preservative 0.3g/L, soak 3-4h；Main immersion：Temperature is normal temperature, and liquor ratio is 20:1, Ai Lite wetting agent HAC 1ml/ L, interval stroke is stayed overnight, secondary sunrise skin, after cropping fleshing is weighed, is soaked again：Liquor ratio is 30:1, sodium chloride 30g/L, Ai Li Special wetting agent HAC 2ml/L, lipase 2g/L, slip-stick, overnight rear and fleshing, deburring；

3) degreasing：Temperature is 40 DEG C, and liquor ratio is 30:1, lipase 3g/L, Ai Lite degreasing agent H 1g/L, stroke 70- 80min, goes out skin, washes after-tack pickling：Temperature is 40 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 60g/L, prestige JA- Overnight stand 12h after 500.7ml/L, formic acid 2ml/L interval stroke 80min, Ai Lite macerating enzyme BRH 1g/L, interval stroke 3h More than；Next day is heated up 30-40 DEG C, and Weiler fatting agent FNP2ml/L, sulfuric acid 1ml/L, interval stroke, mistake are added after stroke 30min Night, m seq goes out skin；

4) tanning：Temperature is 40 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 60g/L, prestige JA-502ml/L, Weiler add Chromium powder 6g/L is added after fat agent FLH 2ml/L, stroke 80min, prestige this chrome and aluminium tanning agent AC 6g/L, chromium powder 7g/L, stroke 90min, Interval stroke, overnight；Next day adds Ai Lite auxiliary tanning agent B 3g/L, pH regulations and arrives 3.8-4.0 or so, and interval stroke is overnight, secondary Sunrise skin；

5) skin is washed：Temperature is 35 DEG C, and liquor ratio is 30:1, formic acid 0.3ml/L, prestige this degreasing agent JA-500.5wt%, stroke Go out skin control water after 20min.

Embodiment 3

The fur tanning method of the present embodiment is carried out in accordance with the following steps：

1) the raw material skin of high-quality is selected, deburring is gone end to end, batching is weighed；

2) pre- immersion：It is normal temperature in temperature, liquor ratio is 20 using paddle-tumble:1 (being calculated by tare weight), Ai Lite wetting agents HAC 1ml/L, preservative 0.3g/L, soak 3-4h；Main immersion：Temperature is normal temperature, and liquor ratio is 20:1, Ai Lite wetting agent HAC 1ml/ L, interval stroke is stayed overnight, secondary sunrise skin, after cropping fleshing is weighed, is soaked again：Liquor ratio is 25:1, sodium chloride 25g/L, Ai Li Special wetting agent HAC 1.8ml/L, lipase 1.5g/L, slip-stick, overnight rear and fleshing, deburring；

3) degreasing：Temperature is 32 DEG C, and liquor ratio is 25:1, lipase 2.5g/L, Ai Lite degreasing agent H 0.7g/L, stroke 70-80min, goes out skin, washes after-tack pickling：Temperature is 32 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 60g/L, prestige JA- Overnight stand 12h after 500.7ml/L, formic acid 3ml/L interval stroke 80min, Ai Lite macerating enzyme BRH 2g/L, interval stroke 3h More than；Next day heats up 30-40 DEG C, addition Weiler fatting agent FNP 1.5ml/L, sulfuric acid 2ml/L after stroke 30min, interval stroke, Overnight, m seq goes out skin；

4) tanning：Temperature is 35 DEG C, and liquor ratio is 20:1, this degreasing agent of sodium chloride 60g/L, prestige JA-500.5ml/L, Weiler Chromium is added after fatting agent FLH 2ml/L, stroke 80min, prestige this chrome and aluminium tanning agent AC 5.5g/L, chromium powder 6.5g/L, stroke 90min Powder 6g/L, interval stroke, overnight；Next day adds Ai Lite auxiliary tanning agent B 2.5g/L, pH regulations and arrives 3.8-4.0 or so, and interval is drawn It is dynamic, overnight, secondary sunrise skin；

5) skin is washed：Temperature is 35 DEG C, and liquor ratio is 30:1, formic acid 0.3ml/L, prestige this degreasing agent JA-500.5wt%, stroke Go out skin control water after 20min.

Embodiment 4

The fur tanning method of the present embodiment is substantially the same manner as Example 3, simply step 3) in the operating procedure of degreasing be： Temperature is 38 DEG C, and liquor ratio is 25:1, lipase 2.8g/L, Ai Lite degreasing agent H 0.9g/L, stroke 70-80min go out skin.

Embodiment 5

The fur tanning method of the present embodiment is substantially the same manner as Example 3, simply step 3) in the operating procedure of degreasing be： Temperature is 36 DEG C, and liquor ratio is 25:1, lipase 2.7g/L, Ai Lite degreasing agent H 0.8g/L, stroke 70-80min go out skin.

Comparative example 1

Operating procedure is substantially the same manner as Example 5, simply step 3) in the operating procedure of degreasing be：Temperature is 36 DEG C, liquid Than for 25:1, Ai Lite degreasing agent H 3g/L, stroke 70-80min, goes out skin, step 2) in be also added without lipase.

Experimental example 1

By the fur obtained using 1-5 of embodiment of the present invention process for tanning by tanning and the tanning side using comparative example 1 Each 10 of the fur that method is obtained, by observing repeatedly and determining performance, is carried out in terms of the sense organ and mechanical performance of fur Contrast, and obtained waste water is subjected to Indexs measure, specific comparative result is as shown in following table 1-3：

The subjective appreciation table of the fur of table 1

The mechanical performance of the fur of table 2

The Indexs measure result of the whole process for tanning output waste water of table 3

From table 1-3 as can be seen that the embodiment of the present invention fur from sense organ to mechanical performance in terms of, compared with prior art The obtained fur of processing method it is more excellent, it is seen that process for tanning of the invention should be widely promoted application, not only environmental protection but also The performance of fur each side can also be improved.

Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that without departing substantially from the present invention's Many other changes and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims Including belonging to all such changes and modifications in the scope of the invention.

Claims (10)

1. a kind of effective reduction waste discharge COD fur tanning method, it is characterised in that comprise the following steps：

(A) the raw material fur of high-quality is selected, after immersion is handled, degreasing is carried out, skimming temp is 30-40 DEG C, degreasing time For 60-90min, lipase concentration is used for 2-3g/L in skimming processes, and Ai Lite degreasings agent concentration is water-soluble for 0.5-1g/L's Liquid, the mass ratio of the aqueous solution and fur is 20-30:1；

(B) by fur that above-mentioned steps are treated again by softening pickling, tanning, after cleaning, produce；

Wherein, immersion processing procedure includes pre- immersion, main immersion and process of soaking again, wherein the medicament used in immersion process again In the aqueous solution, sodium chloride concentration is 20-30g/L, and Ai Lite concentration of wetting agent is 1.5-2ml/L, and lipase concentration is 1-2g/L, The medicament aqueous solution and the mass ratio of fur soaked again is 20-30:1.

2. a kind of effective reduction waste discharge COD according to claim 1 fur tanning method, it is characterised in that institute State in step (A), in the aqueous solution used in skimming processes, lipase concentration is 2.5-2.8g/L, Ai Lite degreasing agents Concentration is 0.7-0.9g/L.

3. a kind of effective reduction waste discharge COD according to claim 1 fur tanning method, it is characterised in that institute It is 32-38 DEG C to state skimming temp in step (A), and degreasing time is 70-80min.

4. a kind of effective reduction waste discharge COD according to claim 1 fur tanning method, it is characterised in that institute State in step (B), the temperature control of pickling is at 30-40 DEG C.

5. a kind of effective reduction waste discharge COD according to claim 1 fur tanning method, it is characterised in that institute State in step (B), the acid soaking step is carried out including three phases, the first stage uses sodium chloride concentration for 50-60g/L, prestige This degreasing agent JA-50 concentration is 0.5-0.7ml/L, and formic acid concn is the 2-3ml/L aqueous solution, interval agitation 60-80min；The Two-stage adds Ai Lite macerating enzyme BRH in aqueous, and its concentration control in aqueous is in 1-2g/L, interval agitation 2- 3h；Phase III addition Weiler fatting agent FNP, sulfuric acid successively in aqueous, their concentration in aqueous are respectively 1- 2ml/L, 1-2ml/L, intermittently stir and stand more than 12h.

6. a kind of effective reduction waste discharge COD according to claim 5 fur tanning method, it is characterised in that institute State in step (B), second stage pickling process stands more than 12h after finishing, then is warming up to 30-40 DEG C of progress phase III pickling Process.

7. a kind of effective reduction waste discharge COD according to claim 1 fur tanning method, it is characterised in that institute State in step (B), the temperature control of tanning is at 30-40 DEG C.

8. a kind of effective reduction waste discharge COD according to claim 7 fur tanning method, it is characterised in that institute State in step (B), stand more than 12h after, in aqueous add Ai Lite auxiliary tanning agent B, its in aqueous concentration control In 2-3g/L.

9. a kind of effective reduction waste discharge COD according to claim 2 fur tanning method, it is characterised in that institute State in step (A), lipase concentration is 2.7g/L, Ai Lite degreasings agent concentration is 0.8g/L.

10. a kind of effective reduction waste discharge COD according to claim 7 fur tanning method, it is characterised in that institute State in step (A), in tannery, it is 0.5- for 50-60g/L, prestige this degreasing agent JA-50 concentration first to use sodium chloride concentration 2ml/L, Weiler fatting agent FLH concentration stir 60-80min, then this chromium aluminum tanning of addition prestige successively for 1-2ml/L aqueous solution interval Agent AC, chromium powder, their concentration in aqueous are respectively 5-6g/L, 6-7g/L, interval agitation more than 90min, then stand 12h More than.