CN101486514A - Wet finishing workshop section wastewater treatment and reclaimed water recycling process for leather - Google Patents
Wet finishing workshop section wastewater treatment and reclaimed water recycling process for leather Download PDFInfo
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- CN101486514A CN101486514A CNA2009100959972A CN200910095997A CN101486514A CN 101486514 A CN101486514 A CN 101486514A CN A2009100959972 A CNA2009100959972 A CN A2009100959972A CN 200910095997 A CN200910095997 A CN 200910095997A CN 101486514 A CN101486514 A CN 101486514A
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Abstract
The invention provides a process for sewage treatment and reuse of recycled water during the leather wet-finishing section in accordance with the characteristics of the water quality of the sewage generated during the existing tannery sewage wet-finishing phase and the preparation section. The process collects the sewage generated by the working procedures of non-chrome retanning, neutralization, coloration, fatliquoring oiling, washing and the like in the wet-finishing phase of the tanning machining process; after the sewage is treated and meets the requirement of water applied to the preparation section, the water is reused in the preparation section by thermoregulation. Therefore, the process lowers the total quantity of the comprehensive sewage, reduces the sewage treatment cost and saves about 30 percent of the total water consumption.
Description
Technical field
The invention belongs to the polluted water of leather production process field, particularly wastewater treatment of leather processing procedure wet finishing workshop section and middle water recovering process.
Background technology
Tanning industry is high water consumption, the heavy polluted industry that is only second to paper-making industry in the light industry.Leather industry reaches 8000～1,200,000,000 tons to the wastewater flow rate of environmental emission every year at present, accounts for 0.3% of national trade effluent total release, contains 120,000 tons of suspended substances in the waste water of these dischargings, ten thousand tons of COD18, ten thousand tons of BOD7,3500 tons of chromium.The tanning production flow process is distinguished to some extent according to raw material skin and the different of product, but roughly prepares workshop section, tanning workshop section, wet finishing workshop section, dried finishing workshop section by being divided into, and wherein prepares workshop section and includes immersion, degreasing, depilation liming, deliming, softening process; Tanning workshop section includes pickling, tanning operation; Wet finishing workshop section includes retanning, neutralization, dyeing, stuffing operation; The dried ornamenting stage includes operations such as drying, arrangement, covering with paint.Wherein, preparing workshop section is the main source of tanning sewage, and quantity of wastewater effluent accounts for about 60% of process hides Total Water, and pollution load accounts for about 70% of total release; Tanning workshop section quantity of wastewater effluent accounts for about 5% of process hides Total Water, and wet finishing workshop section then accounts for about 30%, and other are 5% years old.Because the auxiliary material of preparing to add in the operation of workshop section is salt, tensio-active agent, alkali etc., composition comprises remnants, water soluble protein, hair, skin bit of above-mentioned auxiliary material etc. in the waste water, the waste water principal pollutant are COD, BOD, SS, colourity, grease, ammonia nitrogen and S2 etc., and content is apparently higher than other workshop sections.These Pollutant Treatment more complicated, processing costs is higher; And wet finishing workshop section is removed the retanning stage and may be added beyond the chromium, this workshop section adds auxiliary material and is mainly: sodium acetate, sodium bicarbonate, dyestuff, fatting agent, auxiliary agent and organic acid etc., its waste water main component is the remnants of above-mentioned auxiliary material, the waste water principal pollutant are COD, BOD and colourity, and content is starkly lower than prepares workshop section, these Pollutant Treatment are fairly simple, and processing costs is also low.
Following table is listed each workshop section's waste water main component:
Summary of the invention
The objective of the invention is to have reduced the total amount of composite wastewater in the tanning industry, reduced the sewage disposal expense, also save the wastewater treatment of leather wet finishing workshop section and the middle water recovering process of total water consumption in the process hides process simultaneously in order to provide a kind of.
For achieving the above object, technical scheme of the present invention is, includes following steps,
(1), waste collection and remove solid substance impurity: mixing pit is advanced in the wastewater collection of wet finishing workshop section neutralization, dyeing, stuffing, washing step, and the waste water of collecting is entered grating tank remove solid substance impurity;
(2) wastewater treatment: will collect waste water and carry out the sewage purification processing, degree of treatment is as the criterion to reach preparation workshop section's water and other water workshop section water quality requirements; Wherein prepare workshop section and include washing, immersion, fleshing, depilation liming, deliming, softening workshop section, described other water workshop sections include fleshing machine water, split machine water at least, clean the ground water.
(3) temperature regulation: processed waste water is adjusted to the temperature of preparing workshop section's water;
(4) water is back to and prepares workshop section in: will be back to use preparation workshop section and other water workshop sections by waste liquid after above-mentioned steps is handled." middle water " gives a name in Japan, and the definition of " middle water " has multiple explanation, is called " reuse water " aspect sewerage, and the factory aspect is called " reuse water ", generally with the sign of water quality as differentiation.It is meant that mainly municipal effluent or sanitary sewage reach certain water quality standard after treatment, can reusable within the specific limits undrinkable water.The present invention will handle after reach the reuse water quality requirement of the preparation workshop section of leather production and other water workshop sections waste water be defined as middle water.
Further being provided with is the waste liquid that waste collection also includes non-chromium retanning operation in the described step 1.
Further being provided with is that described preparations workshop section includes washing, immersion, fleshing, depilation liming, deliming, softening workshop section, and described other water workshop sections include fleshing machine water, split machine water, cleaning ground water at least.
The coarse strainer mesh that further setting is described grating tank is not more than 1cm, and the fie screen mesh is not more than 1mm.
Further be provided with is that wastewater treatment is conventional tanning sewage treatment process or other sewage water treatment methods in the described step (2).The method of carrying out middle water treatment owing to the waste water with those wet ornamenting stages is many, but the most stable the most complicated method is exactly conventional tanning sewage treatment process, this method is because relate to the design and the order of a whole set of treatment process, each treatment process is different to the clearance of pollutent, concrete processing parameter can be determined according to reality, but as long as the water quality after last the processing can reach the water quality of reuse.Figure of description 2 provides the simple water treatment process figure can be for reference, and different slip-stick artists can design different schemes according to original waste water and reuse water quality requirement.Also can adopt additive method to dispose of sewage in addition, the water quality that can reach reuse with the middle water water quality after the last processing gets final product, as adopting the method for flocculation sediment.
Further be provided be in the described step 3 temperature regulation for to freeze by refrigerator.
The invention has the advantages that:
(1), wet finishing workshop section waste water is carried out individual curing, Pollutant Treatment is simple in the waste water, and the sewage disposal expense is low; Conventional tanning sewage treatment process generally arrives country-level or three grades of emission standards (meeting of each department is variant) with sewage disposal, do the water treatment expense like this than higher, and water resources is used once just discharging, water consumption is huge, and the present invention will be in conjunction with the water quality characteristics in wet ornamenting stage, the waste water in wet ornamenting stage is carried out simple process to reuse water water quality requirement, be back to preparation workshop section and other water workshop sections that the huge leather of water loss is produced then, so not only water treatment expense is just lower, and water resources is used again, leather water of productive use and sewage disposal expense have been saved, and directly reduce effluent charge, bring great economic benefit and environmental benefit.
(2), the present invention can save total water amount about 30%, and is even higher, total amount of sewage discharge reduces about 30%, for the leather industry energy-saving and emission-reduction provide a kind of new approach.
(3), because preparation workshop section is lower to water quality requirement, as long as that uses works as, reuse water generally can not cause product quality problem, and the leather quality that technology of the present invention is made does not have obvious difference with the conventional leather of producing, and its product meets People's Republic of China's light industry standard;
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
Fig. 1 wet finishing workshop section waste water recycling of the present invention schematic flow sheet;
Fig. 2 wastewater treatment process synoptic diagram of the present invention.
Embodiment
Below in conjunction with Figure of description and embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the qualification to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Embodiment 1
(1) waste collection and remove solid substance impurity: mixing pit is advanced in the wastewater collection of non-chromium retanning, neutralization, dyeing, stuffing, washing step in the ornamenting stage of will wetting, and the waste water of collecting is entered grating tank removes solid substance impurity;
(2) wastewater treatment: will collect waste water and handle, and make that COD will be less than 80Omg/L in the waste water, BOD5 is less than 500mg/L, and colourity is less than 50 times;
(3) temperature regulation: processed waste water is freezed to 20 ± 2 degree;
(4) be back to preparation workshop section: will after above-mentioned steps is handled, be back to use preparation workshop section by waste liquid, as operations such as washing, immersion, depilation limings.
Embodiment 2
(1) waste collection and remove solid substance impurity: mixing pit is advanced in the wastewater collection of operations such as wet ornamenting stage neutralization, dyeing, stuffing, washing, enters grating tank and removes solid substance impurity;
(2) wastewater treatment: will collect waste water and handle, and make that COD will be less than 50Omg/L in the waste water, BOD5 is less than 300mg/L, and colourity is less than 50 times;
(3) temperature regulation: with processed waste water freeze to 30 the degree about;
(4) be back to and prepare workshop section: will be through above-mentioned steps be handled after waste liquid be back to use deliming, deliming after washing in the preparation workshop section, wash operation such as ground.
Embodiment 3
(1) collect, remove solid substance impurity: mixing pit is advanced in the wastewater collection of operations such as wet ornamenting stage neutralization, dyeing, stuffing, washing, enters grating tank and removes solid substance impurity;
(2) wastewater treatment: will collect waste water and handle, and make that COD will be less than 1000mg/L in the waste water, BOD5 is less than 600mg/L, and colourity is less than 50 times;
(3) temperature regulation: with processed waste water freeze to 25 the degree about;
(4) be back to preparation workshop section: will after above-mentioned steps is handled, be back to use operations such as preparing fleshing in the workshop section, immersion, liming after washing, flushing ground by waste liquid.
Claims (6)
1. water recovering process during leather wet finishing workshop section wastewater treatment reaches is characterized in that: include following steps,
(1), waste collection and remove solid substance impurity: mixing pit is advanced in the wastewater collection of will the wet neutralization of ornamenting stage, dyeing, stuffing, washing step, and the waste water of collecting is entered grating tank removes solid substance impurity;
(2) wastewater treatment: will collect waste water and carry out the sewage purification processing, degree of treatment is as the criterion to reach preparation workshop section's water and other water workshop section water quality requirements;
(3) temperature regulation: processed waste water is adjusted to the temperature of preparing workshop section's water;
(4) water is back to and prepares workshop section in: will be after above-mentioned steps be handled waste liquid be back to use preparation workshop section and other water workshop sections of process hides.
2. leather wet finishing workshop section according to claim 1 wastewater treatment and middle water recovering process, it is characterized in that: waste collection also includes the waste liquid of non-chromium retanning operation in the described step (1).
3. leather wet finishing workshop section according to claim 1 and 2 wastewater treatment and middle water recovering process, it is characterized in that: described preparation workshop section includes washing, immersion, fleshing, depilation liming, deliming, softening workshop section, and described other water workshop sections include fleshing machine water, split machine water at least, clean the ground water.
4. leather wet finishing workshop section according to claim 3 wastewater treatment and middle water recovering process, it is characterized in that: the coarse strainer mesh of described grating tank is not more than 1cm, and the fie screen mesh is not more than 1mm.
5. leather wet finishing workshop section according to claim 4 wastewater treatment and middle water recovering process, it is characterized in that: wastewater treatment is conventional tanning sewage treatment process or other sewage water treatment methods in the described step (2).
6. leather wet finishing workshop section according to claim 5 wastewater treatment and middle water recovering process, it is characterized in that: temperature regulation is for to freeze by refrigerator in the described step 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100959972A CN101486514B (en) | 2009-02-26 | 2009-02-26 | Wet finishing workshop section wastewater treatment and reclaimed water recycling process for leather |
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| CN2009100959972A CN101486514B (en) | 2009-02-26 | 2009-02-26 | Wet finishing workshop section wastewater treatment and reclaimed water recycling process for leather |
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| CN101486514A true CN101486514A (en) | 2009-07-22 |
| CN101486514B CN101486514B (en) | 2012-08-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433773A (en) * | 2011-08-25 | 2012-05-02 | 浙江亿得化工有限公司 | Process for recycling printing and dyeing waste water |
| CN102535197A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process indefinitely recycling waste liquid to perform dyeing |
| CN105154596A (en) * | 2015-10-26 | 2015-12-16 | 烟台大学 | Manufacturing technology for flame-retardant, anti-yellowing and low-fogging cowhide car seat cushion leather |
| CN106032552A (en) * | 2015-03-13 | 2016-10-19 | 焦作隆丰皮草企业有限公司 | A treating system and a treating method for fur processing waste water |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132184A (en) * | 1995-03-31 | 1996-10-02 | 成都华西环保科技公司 | Leather waste water treatment technique |
| CN101239769B (en) * | 2008-02-01 | 2011-05-25 | 浙江大学 | Leather-making waste water reusing treatment method |
| CN101269901B (en) * | 2008-05-13 | 2011-07-27 | 广西丽桂环保科技有限公司 | Comprehensive approach for processing and cyclic utilization of sewage water |
-
2009
- 2009-02-26 CN CN2009100959972A patent/CN101486514B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535197A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process indefinitely recycling waste liquid to perform dyeing |
| CN102433773A (en) * | 2011-08-25 | 2012-05-02 | 浙江亿得化工有限公司 | Process for recycling printing and dyeing waste water |
| CN102433773B (en) * | 2011-08-25 | 2013-05-29 | 浙江亿得化工有限公司 | Process for recycling printing and dyeing waste water |
| CN106032552A (en) * | 2015-03-13 | 2016-10-19 | 焦作隆丰皮草企业有限公司 | A treating system and a treating method for fur processing waste water |
| CN105154596A (en) * | 2015-10-26 | 2015-12-16 | 烟台大学 | Manufacturing technology for flame-retardant, anti-yellowing and low-fogging cowhide car seat cushion leather |
| CN105154596B (en) * | 2015-10-26 | 2017-03-22 | 烟台大学 | Manufacturing technology for flame-retardant, anti-yellowing and low-fogging cowhide car seat cushion leather |
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| CN101486514B (en) | 2012-08-22 |
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