CN104211232A - Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater - Google Patents

Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater Download PDF

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Publication number
CN104211232A
CN104211232A CN201410467576.9A CN201410467576A CN104211232A CN 104211232 A CN104211232 A CN 104211232A CN 201410467576 A CN201410467576 A CN 201410467576A CN 104211232 A CN104211232 A CN 104211232A
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CN
China
Prior art keywords
dyeing
wastewater
coal ash
scrap iron
flyash
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Pending
Application number
CN201410467576.9A
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Chinese (zh)
Inventor
陆强
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XI'AN HUALU ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
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XI'AN HUALU ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
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Application filed by XI'AN HUALU ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd filed Critical XI'AN HUALU ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
Priority to CN201410467576.9A priority Critical patent/CN104211232A/en
Publication of CN104211232A publication Critical patent/CN104211232A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a method for coal ash and scrap iron combined treatment of dyeing and printing wastewater, belonging to the field of wastewater treatment methods. The method comprises the following steps: coarsely filtering the dyeing and printing wastewater, adjusting the pH value to be 3-5 by using an acid, adding a certain proportion of coal ash and scrap iron, uniformly stirring, standing for 40-60 minutes, and filtering the wastewater to obtain treated outlet water meeting the standard. According to the method, the industrial wastes-coal ash and scrap iron are combined for treating the dyeing and printing wastewater; the color removal rate and the COD removal rate are high; an electrochemical action is mainly used and meanwhile various mechanisms of reduction, physical adsorption, coagulation and the like are used; the treatment effect is a result of the synergistic effect of the various mechanisms; the used coal ash and scrap iron are two types of industrial wastes and are low in price and wide in source, and wastes can be treated with wastes; the method has the advantages of being efficient, low in investment, simple in technological process, convenient to perform, low in operating expense and the like, and is an effective method for treating the dyeing and printing wastewater.

Description

The method of flyash iron filings combined treatment dyeing waste water
Technical field
The present invention relates to a kind of method of flyash iron filings combined treatment dyeing waste water, belong to method of wastewater treatment field.
Background technology
The dyeing waste-water of dyeing discharge is one of noxious industry waste water generally run into both at home and abroad, serious environment pollution, the domestic main treatment technology about such waste water has oxidation style, absorption method, reverse osmosis method, electrolytic process, flocculent precipitation, coagulation-biochemical process etc. at present, although these methods achieve certain achievement, but still existing problems.
Therefore, the treatment process studying the dyeing waste-water that a kind of technique is simple, easy to operate, working cost is low, treatment effect is good has certain necessity.
Summary of the invention
The present invention aims to provide a kind of method utilizing trade waste flyash iron filings combined treatment dyeing waste water that technique is simple, easy to operate, working cost is low, treatment effect is good.
The method of flyash iron filings combined treatment dyeing waste water of the present invention, comprises the following steps:
After dyeing waste water coarse filtration, with acid, its pH is adjusted to 3-5, adds a certain proportion of flyash and iron filings simultaneously, static process 40-60min after stirring, the draining that filtered wastewater is up to standard after being process
Preferably, iron filings dosage of the present invention is 5% weight of wastewater volume, flyash dosage is 6% weight of wastewater volume.
Preferred, described water inlet pH value of the present invention is 4, and the static treatment time is 50min.
The method of flyash iron filings combined treatment dyeing waste water of the present invention, adopt the organism in internal electrolysis degrading waste water, its principle mainly there occurs electrochemical action, reductive action, coagulation, physisorption, H+ activation and process effect indirectly.
(1) electrochemical action: because iron and carbon electromotive force have notable difference, the iron filings contacted with each other in electrolyte solution and flyash can be used as powdery electrode, and form numerous galvanic cell, iron is corroded as anode, and carbon as negative electrode, and electrode reaction occurs.
Anode (Fe) Fe → Fe 2++ 2e E=-0.44V
Negative electrode (C) 2H ++ 2e → 2 [H] → H 2(acidic solution) E=0.00V
Nascent state product H and Fe 2+there is higher chemically reactive, with the many component generation reduction reactions in dyeing waste water, the chromonic structures of chromonic material can be destroyed in slant acidity solution, make the conjugated system of dyestuff fracture occur and reach the object of decolouring.
(2) reductive action: nascent state product Fe in an acidic solution 2+azo dyes has stronger reductive action to make macromole dyestuff dissociate into lower-molecular substance.
4Fe 2++R-N?=?N-R’?+?4H 2O?=?RNH 2+R’NH 2+?4Fe 3++4OH-
Reducing dyes can be directly amido organism by iron in acidic aqueous solution, and amido is organic to be looked for light, therefore chroma in waste water reduces.
4Fe+R-N?=?N-R’?+?4H 2O?=?RNH 2+R’NH 2+?4Fe 2++?4OH-
(3) coagulation: Fe 2+and Fe 3+be good flocculation agent, Fe (OH) can be formed when suitable pH value 2
With Fe (OH) 3 flocks, in acid condition Fe 2+there is very high absorption, flocculation activity, can be crosslinked together and deposition of flocculating is got off by the dye molecule in waste water, thus reduce COD and the colourity of waste water.Flyash is originally conducive to the formation of ferric hydroxide colloid as alkalescence, contained silicate micelle can play coagulant aids effect again.
(4) physisorption: flyash because its structural porousness, particle diameter are less, have the nonsaturation of larger specific surface area, surperficial valence link and there is a large amount of oxy radicals (as hydroxycarbonyl group etc.), therefore have stronger adsorptive power, adsorbable dye molecule.
(5) H+ activation: iron, in aerobic environment, very easily produces passivation phenomenon at its Surface Creation layer oxide film, metallic corrosion is slowed down, and reduces decolorizing effect.In good time add H+ and can destroy anode oxide film, play the activation of anode.
(6) process effect indirectly: with Fe in the water outlet after process 2+, Fe 3+be good flocculation agent and sorbent material with small coke grain, then water quality after alkaline chemical precipitation process, can be made to improve further, thus improve colourity and COD clearance.
The method of flyash iron filings combined treatment dyeing waste water of the present invention, adopt trade waste flyash and iron filings combined treatment dyeing waste water, there is good percent of decolourization and COD clearance, the method is mainly based on electrochemical action, have reduction concurrently simultaneously, the number of mechanisms such as physical adsorption and coagulation, treatment effect is the synergistic result of various mechanism, the flyash used and iron filings are two kinds of industrial wastes, cheap, wide material sources, and can the treatment of wastes with processes of wastes against one another, the method has efficiently, less investment, technical process is simple, easy to operate, the advantages such as working cost is low, it is a kind of method of effective treatment of dyeing and printing.
Embodiment
Embodiment one:
After dyeing waste water coarse filtration, with acid, its pH is adjusted to 4, adds the flyash of the iron filings of 5% weight of wastewater volume and 6% weight of wastewater volume simultaneously, static process 50min after stirring, the draining that filtered wastewater is up to standard after being process.
Embodiment two: treatment effect
Use the method for flyash iron filings combined treatment dyeing waste water of the present invention, process two kinds of dyeing waste waters, result as shown in Table-1.
Table-1 treatment effect

Claims (3)

1. the method for flyash iron filings combined treatment dyeing waste water, comprises the following steps:
After dyeing waste water coarse filtration, with acid, its pH is adjusted to 3-5, adds a certain proportion of flyash and iron filings simultaneously, static process 40-60min after stirring, the draining that filtered wastewater is up to standard after being process.
2. the method for flyash iron filings combined treatment dyeing waste water as claimed in claim 1, is characterized in that 6% weight that described iron filings dosage is 5% weight of wastewater volume, flyash dosage is wastewater volume.
3. the method for flyash iron filings combined treatment dyeing waste water as claimed in claim 1, it is characterized in that described water inlet pH value is 4, the static treatment time is 50min.
CN201410467576.9A 2014-09-15 2014-09-15 Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater Pending CN104211232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410467576.9A CN104211232A (en) 2014-09-15 2014-09-15 Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410467576.9A CN104211232A (en) 2014-09-15 2014-09-15 Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater

Publications (1)

Publication Number Publication Date
CN104211232A true CN104211232A (en) 2014-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410467576.9A Pending CN104211232A (en) 2014-09-15 2014-09-15 Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater

Country Status (1)

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CN (1) CN104211232A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104591368A (en) * 2015-01-26 2015-05-06 大连理工大学 Iron-coal ash-kaolin filler and method for reductively converting nitro-aromatic waste water
CN108383227A (en) * 2018-03-15 2018-08-10 长兴科创科技咨询有限公司 A kind of preparation method for the pretreated flocculating agent of dyeing waste-water
CN108408963A (en) * 2018-03-15 2018-08-17 长兴科创科技咨询有限公司 A kind of method of coagulation pretreatment dyeing waste-water

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104591368A (en) * 2015-01-26 2015-05-06 大连理工大学 Iron-coal ash-kaolin filler and method for reductively converting nitro-aromatic waste water
CN108383227A (en) * 2018-03-15 2018-08-10 长兴科创科技咨询有限公司 A kind of preparation method for the pretreated flocculating agent of dyeing waste-water
CN108408963A (en) * 2018-03-15 2018-08-17 长兴科创科技咨询有限公司 A kind of method of coagulation pretreatment dyeing waste-water
CN108408963B (en) * 2018-03-15 2021-04-20 长兴科创科技咨询有限公司 Method for pretreating dyeing wastewater by coagulation
CN108383227B (en) * 2018-03-15 2021-06-04 长兴科创科技咨询有限公司 Preparation method of coagulant for pretreatment of dyeing wastewater

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