CN103880221A - Process for treating and recycling wet finishing mixing wastewater in leather production - Google Patents
Process for treating and recycling wet finishing mixing wastewater in leather production Download PDFInfo
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- CN103880221A CN103880221A CN201410148108.5A CN201410148108A CN103880221A CN 103880221 A CN103880221 A CN 103880221A CN 201410148108 A CN201410148108 A CN 201410148108A CN 103880221 A CN103880221 A CN 103880221A
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- composite waste
- reuse technology
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Abstract
The invention discloses a process for treating and recycling wet finishing mixing wastewater in leather production. The wet finishing mixing wastewater specifically comprises neutralizing wastewater, retanning filling wastewater, dyeing wastewater and ester adding mixing wastewater. The treatment method of the mixing wastewater comprises the following steps of: adding a coagulant and a coagulant to wastewater for flocculating and precipitating; filtering; adding acid to adjust pH until reaching a certain range; adding an oxidant for oxidizing; precipitating by the stage type precipitating method after the oxidization is finished; then adding acid to adjust the pH of the treated wastewater to be neutral; and finally recycling. According to the recycling process for treating the wet finishing mixing wastewater in the leather production, the technology in the combination of flocculating method and the oxidization method is utilized for removing the pollutant in the wastewater; in addition, the secondary precipitating method is carried out to further remove the pollutant in the wastewater, and as a result, the purposes of purifying water and recycling wastewater are reached.
Description
Technical field
The processing reuse technology that the present invention relates to leather industry waste water, belongs to waste water treating and reutilizing field.
Background technology
Leather industry is that sewage produces rich and influential family, and tanning sewage not only output is large, and complicated component, concentration are high, wherein COD
cr, BOD
5, sulfide, ammonia nitrogen, suspended substance etc. are very high, are a kind of compared with the trade effluent of refractory reason.Different according to the specific requirement of raw material skin and product, leather Production Flow Chart is difference to some extent also, therefore the waste water composition in production process also has bigger difference, and leather Production Flow Chart can be divided on the whole prepares workshop section, tanning process, wet finishing workshop section, dry finishing workshop section.
Prepare workshop section and mainly comprise immersion, degreasing, liming depilation, deliming, softening process; Tanning process includes pickling, tanning operation; Wet finishing workshop section includes retanning, neutralization, dyeing, stuffing operation; The operations such as that dry finishing workshop section includes is dry, arrangement, covering with paint.
Preparing workshop section is the main source of tanning sewage, and quantity of wastewater effluent accounts for 60% left and right of process hides total Water, and pollution load accounts for 70% left and right of total release; Tanning process quantity of wastewater effluent accounts for 5% left and right of process hides total water amount, and wet finishing workshop section accounts for 30% left and right, and other are 5% years old; Wet finishing workshop section may be introduced chromium except the retanning stage, this workshop section also can introduce sodium bicarbonate, sodium acetate, fatting agent, dyestuff, auxiliary agent and organic acid etc., so workshop section has higher COD, BOD and colourity, pollutent complicated, hazardness is large, difficulty of governance is high, and therefore this workshop section is the most important thing during leather waste water is processed.
At present, the existing sewage treatment facility of domestic curriery, 95% be all to reach the secondary discharge standard of country in " integrated wastewater discharge standard ", reach first discharge standard, and normal operation is few in number, be mostly because treatment process is unreasonable, working cost is too high, operational management is loaded down with trivial details, and can not normally move.In addition, have the tannery waste of some amount unprocessed or only after simple precipitation, directly enter river or lake, the even dell having discharge, has caused great harm to ecotope and living environment.
In actual production process; process by dyeing, stuffing, retanning composite waste being carried out to letter; after making it to reach the water of preparing workshop section, tanning process, dyeing, stuffing, retanning workshop section and requiring; can reuse leather water of productive use; water conservation and people's living environment to a certain extent, the maximized coordinating and unifying that realizes economic benefit and ecological benefits.
Summary of the invention
The object of this invention is to provide a kind of total amount that can reduce composite wastewater in tanning industry, reduce sewage disposal expense, reduce in process hides process the processing reuse technology of dyeing in the leather production of leather production total water consumption, stuffing, retanning composite waste simultaneously.
For achieving the above object, technical scheme of the present invention is:
A kind of leather is wet ornamenting composite waste processing reuse technology in producing, and it is characterized in that, comprises step:
A, in composite waste, add a certain amount of coagulating agent and flocculation agent, carry out flocculation sediment, and carry out press filtration processing;
The pH of b, adjustment filtrate, in certain limit, adds oxygenant to carry out oxide treatment subsequently wherein;
C, reacted after, first adjust pH between 7.5～11.0 with binary highly basic, and the precipitation of generation carried out to press filtration processing; Add wherein subsequently monobasic highly basic, further adjust pH between 12.0～14.0, after stirring reaction, the precipitation of generation is carried out to press filtration processing;
D, pressure filtrate, acid adding is adjusted pH between 6.0～7.0.
Described coagulating agent is polymerize aluminum chloride, polyaluminium sulfate, polymer phosphate iron, poly-ferric chloride or poly-ferrous, and the concentration of the coagulating agent aqueous solution is 5～20%, and the volume ratio of its aqueous solution and waste water is controlled at 2～10%.
Described flocculation agent is polyacrylamide, sodium polyacrylate or calcium polyacrylate (CPA), and the concentration of its aqueous solution is controlled between 1～5 ‰, and the add-on of flocculant aqueous solution is controlled at 2～6% of wastewater volume.
Described oxygenant is potassium permanganate, ozone, hydrogen peroxide, chlorine, oxymuriate, hypochlorite or Fenton reagent.
Described alkaline chemical precipitation adopts binary highly basic and monobasic highly basic substep to add, the method for ladder precipitation, and described binary highly basic is calcium hydroxide, magnesium hydroxide, calcium oxide or magnesium oxide.
Described monobasic highly basic is sodium hydroxide or potassium hydroxide.
In described step b, adjusting pH acid used is sulfuric acid, and its pH scope control is between 3.5～5.5.
Acid in described steps d is sulfuric acid or hydrochloric acid.
Advantage of the present invention is: two kinds of classics, easy wastewater processing technology are combined, and at employing ladder, the secondary precipitation of alkaline chemical precipitation stage novelty, waste water is processed, easy and simple to handle, stable effluent quality, can reduce to the full extent the contamination indexs such as suspended substance in waste water, BOD, COD, colourity, wherein the content of chromium (Cr) can be reduced to 1.5mg/L, has realized good waste water treating and reutilizing effect.
Embodiment
By the case by concrete first, the present invention will be described below.
Case study on implementation 1:
A, the ornamenting composite waste that will wet are collected into mixing pit, process wastewater volume than 3% polymerize aluminum chloride (PAC) aqueous solution (its concentration is 10%) to adding in composite waste, and vigorous stirring, makes it fully react with composite waste; To polyacrylamide (PAM) aqueous solution that adds volume ratio 3% in composite waste, the concentration of the PAM aqueous solution is controlled at 3 ‰ again; After fully stirring, waste water is carried out to press filtration processing.
B, use sulfuric acid to adjust the pH of filtered liquid in 4 left and right, adding wherein subsequently mass ratio is 1 ‰ solid potassium permanganate (KMnO
4), add before potassium permanganate, need to be first made into 10% solution, then join in the supernatant liquor after pre-treatment, then vigorous stirring is carried out oxidizing reaction 1.5h.
C, after oxidizing reaction completes, use Ca (OH)
2adjust pH in 10.0 left and right, after vigorous stirring reaction, carry out press filtration processing; Collect filtrate, in filtrate, add NaOH, further adjust pH in 13.5 left and right, fully, after stirring reaction, carry out press filtration processing.
D, get filtrate, use sulfuric acid (H
2sO
4) adjust pH between 6.0～7.0.
Case study on implementation 2:
A, the ornamenting composite waste that will wet are collected into mixing pit, process wastewater volume than 4% polyphosphoric acid iron (PFP) aqueous solution (its concentration is 5%) to adding in composite waste, and vigorous stirring, makes it fully react with composite waste; Polyacrylamide (PAM) aqueous solution that adds wherein again volume ratio 4%, the concentration of the PAM aqueous solution is controlled at 3 ‰; Fully, after effect, waste water is carried out to press filtration processing.
B, use sulfuric acid to adjust the pH of filtered liquid in 3.5 left and right, adding wherein subsequently mass ratio is 1.5 ‰ potassium permanganate (KMnO
4), in the supernatant liquor adding after pre-treatment before, need first potassium permanganate is made into 10% solution, after adding, vigorous stirring is carried out oxidizing reaction 1h.
After c, oxidizing reaction complete, with Ca (OH)
2adjust pH in 11.0 left and right, after vigorous stirring reaction, precipitation is carried out to press filtration processing; Collect filtrate, add wherein NaOH, further adjust pH more than 14.0, fully, after stirring reaction, precipitation is carried out to press filtration processing.
D, get filtrate, adjust pH between 6.0～7.0 with hydrochloric acid (HCl).
Claims (8)
1. in leather production, wet ornamenting composite waste is processed a reuse technology, it is characterized in that, comprises step:
A, in composite waste, add a certain amount of coagulating agent and flocculation agent, carry out flocculation sediment, and carry out press filtration processing;
The pH of b, adjustment filtrate, in certain limit, adds oxygenant to carry out oxide treatment subsequently wherein;
C, reacted after, first adjust pH between 7.5～11.0 with binary highly basic, and the precipitation of generation carried out to press filtration processing; Add wherein subsequently monobasic highly basic, further adjust pH between 12.0～14.0, after stirring reaction, the precipitation of generation is carried out to press filtration processing;
D, pressure filtrate, acid adding is adjusted pH between 6.0～7.0.
2. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, described coagulating agent can be polymerize aluminum chloride, polyaluminium sulfate, polymer phosphate iron, poly-ferric chloride or poly-ferrous, the concentration of the coagulating agent aqueous solution is 5～20%, and the volume ratio of its aqueous solution and waste water is controlled at 2～10%.
3. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, described flocculation agent can be polyacrylamide, sodium polyacrylate or calcium polyacrylate (CPA), the concentration of its aqueous solution is controlled between 1～5 ‰, and the add-on of flocculant aqueous solution is controlled at 2～6% of wastewater volume.
4. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, described oxygenant is potassium permanganate, ozone, hydrogen peroxide, chlorine, oxymuriate, hypochlorite or Fenton reagent.
5. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, described alkaline chemical precipitation adopts binary highly basic and monobasic highly basic substep to add, the method of ladder precipitation, described binary highly basic is calcium hydroxide, magnesium hydroxide, calcium oxide or magnesium oxide.
6. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, described monobasic highly basic is sodium hydroxide or potassium hydroxide.
7. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, in described step b, adjusting pH acid used is sulfuric acid, and its pH scope control is between 3.5～5.5.
8. in leather production according to claim 1, wet ornamenting composite waste is processed reuse technology, it is characterized in that, the acid in described steps d is sulfuric acid or hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410148108.5A CN103880221B (en) | 2014-04-15 | 2014-04-15 | A kind of leather is wet ornamenting composite waste treatment for reuse technique in producing |
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|---|---|---|---|
| CN201410148108.5A CN103880221B (en) | 2014-04-15 | 2014-04-15 | A kind of leather is wet ornamenting composite waste treatment for reuse technique in producing |
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| CN103880221A true CN103880221A (en) | 2014-06-25 |
| CN103880221B CN103880221B (en) | 2016-04-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384172A (en) * | 2014-10-25 | 2015-03-04 | 陈列鑫 | Disposal method for rectification residues in production of synthetic leather |
| CN106745587A (en) * | 2016-12-01 | 2017-05-31 | 南平博士达节能科技有限公司 | The process for primary treatment of synthetic leather high ammonia-nitrogen wastewater |
| CN108975554A (en) * | 2018-08-07 | 2018-12-11 | 广东鼎丰纸业有限公司 | The efficiently method of removal pulp-making waste-water COD |
| CN113149164A (en) * | 2021-03-10 | 2021-07-23 | 四川大学 | Leather-making preparation section wastewater treatment agent and preparation method and application thereof |
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| CN103449677A (en) * | 2013-09-12 | 2013-12-18 | 安徽省绿巨人环境技术有限公司 | Treatment process for wastewater produced in production of PU (Poly Urethane) synthetic leather |
| CN103663865A (en) * | 2013-11-27 | 2014-03-26 | 湖州织里童装发展有限公司 | Leather wastewater treatment process |
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| KR200191269Y1 (en) * | 1999-10-18 | 2000-08-16 | 지종기 | Ultrasonic wave device for waste water treatment using hollow fiber filter |
| CN101041500A (en) * | 2007-03-28 | 2007-09-26 | 中国皮革和制鞋工业研究院 | Highly effective reusing method for leather producing chrome tanning exhausted liquid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384172A (en) * | 2014-10-25 | 2015-03-04 | 陈列鑫 | Disposal method for rectification residues in production of synthetic leather |
| CN106745587A (en) * | 2016-12-01 | 2017-05-31 | 南平博士达节能科技有限公司 | The process for primary treatment of synthetic leather high ammonia-nitrogen wastewater |
| CN108975554A (en) * | 2018-08-07 | 2018-12-11 | 广东鼎丰纸业有限公司 | The efficiently method of removal pulp-making waste-water COD |
| CN108975554B (en) * | 2018-08-07 | 2019-11-08 | 广东鼎丰纸业有限公司 | The efficiently method of removal pulp-making waste-water COD |
| CN113149164A (en) * | 2021-03-10 | 2021-07-23 | 四川大学 | Leather-making preparation section wastewater treatment agent and preparation method and application thereof |
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| CN103880221B (en) | 2016-04-06 |
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