CN101643264A - Method for treating waste water from electric galvanization in cold rolling - Google Patents
Method for treating waste water from electric galvanization in cold rolling Download PDFInfo
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- CN101643264A CN101643264A CN200810117788A CN200810117788A CN101643264A CN 101643264 A CN101643264 A CN 101643264A CN 200810117788 A CN200810117788 A CN 200810117788A CN 200810117788 A CN200810117788 A CN 200810117788A CN 101643264 A CN101643264 A CN 101643264A
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- waste water
- cold rolling
- galvanization
- electric galvanization
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Abstract
The invention belongs to the technical field of waste water treatment and particularly relates to a method for treating waste water from electric galvanization in cold rolling. The invention providesa method for treating waste water from electric galvanization in cold rolling, which has the advantages of little electricity consumption, good treatment effect and no secondary pollution. The treatment flow of the method comprises the following steps that: high-zinc concentration waste water discharged from a cold rolling electric galvanization machine set enters a neutralization reaction pond tobe neutralized by using industrial slaked lime serving as a neutralizer; the pH value of waste water is increased from 1 to 2 up to 8.5 to 9; the waste water is subjected to solid-liquid separation by a membrane liquid filter; and the filtrate obtained after filtration is discharged after reaching standards, and the sludge is delivered to an acid and alkali waste water processing sludge system.
Description
Technical field
The invention belongs to technical field of waste water processing, particularly a kind of treatment process of waste water from electric galvanization in cold rolling.
Background technology
Along with science and technology development, the turnout and the consumption of zinc increase sharply.In the Asia, the consumption of zinc accounts for 37.4% of world consumption total amount, and China has become the production and consumption big country of world's zinc.Zinc mainly is used to the galvinized steel goods, to prevent corrosion, secondly is brass consumption zinc, alloy for die casting etc.The application of metallic zinc has penetrated in all modern fundamental construction, all needs a large amount of galvanized steels as electric power factory and transport net thereof, airport, bridge, road, particularly motorway etc.When producing and using zinc, can produce a large amount of zinc-containing waters, the discharging of zinc-containing water has serious harm to HUMAN HEALTH and industrial or agricultural activity, have harm such as persistence, toxicity be big, seriously polluted, can not be behind the environment in case enter by biological degradation, great majority participate in the food chain circulation, and finally accumulation in vivo, destroy organism normal physiological Metabolic activity, be detrimental to health.
Zinc once was described as " flower of life ", and it is to keep the growth of body normal growth, metabolic important substance.Zinc has extremely heavy physiology and biochemical function in human body.If but zinc is too high at people's in-vivo content, will suppress cytophagous activity and sterilizing power, thereby reduce the immunologic function of human body, resistibility is weakened, disease susceptibility is increased.The treatment process of zinc-containing water has electrolytic process, sulfurization-precipitation method etc.Electrolytic process is to utilize the electrochemical properties of metal, and under the direct current effect, the compound of zinc (II) is dissociated into metal ion at anode, becomes metal in cathodic reduction, and removes the zine ion in the waste water.This method is to handle a kind of effective ways that contain zinc waste water, and the processing efficiency height also is convenient to recycle.But this method shortcoming is the zinc ion concentration in the water can not fall very lowly, and this kind method power consumption is big, the cost of investment height.Sulfurization-precipitation method utilizes Na under the weak basic condition
2S among S, the MgS
2+And stronger avidity is arranged between the heavy metal ion, generate the minimum sulfide precipitation of solubility product and from solution, remove.But the consumption of this kind method sulphur is wayward, the excessive secondary pollution that too much not only brings sulphur, and also excessive sulphur and some heavy metal ion can generate water-soluble complexing ion and reduce treatment effect.
Summary of the invention
The invention provides that a kind of power consumption is little, treatment effect good, the treatment process of a kind of waste water from electric galvanization in cold rolling of non-secondary pollution.
The invention provides a kind of treatment process of waste water from electric galvanization in cold rolling, its flow process is as follows:
The high zinc concentration waste water of being discharged by cold rolling electroplating zinc unit enters the neutralization reaction pond, with industrial slaked lime is the neutralizing agent neutralization, and wastewater pH brings up to 8.5～9 by 1～2, makes solid-liquid separation through the thin film fluid strainer then, filter the rear filtrate qualified discharge, mud send sludge treating system.
The present invention has following beneficial effect: power consumption of the present invention is little, non-secondary pollution, protection environment; Thin film fluid filter apparatus volume is little, small accommodation area; Water outlet reaches emission standard, can realize useless Water reuse, has solved the problem of water scarcity, has reached economic benefit, social benefit and environmental benefit three's organic unity.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
High zinc concentration waste water enters the neutralization reaction pond, is the neutralizing agent neutralization with industrial slaked lime, and wastewater pH brings up to 8.5～9 by 1～2, and fully reaction is effectively controlled the pH value so that Zn
+Form Zn (OH)
2It is the prerequisite of guaranteeing the qualified discharging of waste water that precipitation is separated out, and is made of 3 neutralization reaction ponds, and the residence time is 5 hours.Milk of lime preparation and feed unit are made up of lime feed bin, milk of lime preparation and supply dosing system, comprise facilities such as warehouse, screw feeder, mixing tank, dissolving tank, stirring unit and Lime Milk Transfer Pump, the lime milk concentration for preparing is 8%～10%, by carrying pumping neutralization reaction pond.The thin film fluid strainer utilizes film to carry out surface filtration, film surface is a modification infusorial earth, make suspended solids in the liquid all be blocked in the surface of film, this filter membrane has that skin friction coefficient is low, the unit membrane area becomes characteristics such as porosity height, can remain low filtration resistance and higher membrane flux, in addition, mould material has better chemical stability and the anti-automatically characteristics of cleaning of energy bonding apparatus device, accomplishes continuous filtration.The sludge treatment unit is made up of mud collecting tank, slush pump etc., and mud send the pressure filter press filtration after concentrating.The hydrochloric acid activation cleaning unit is made up of hydrochloric acid pond and delivery cycle pump etc., to CaSO remaining on the filter membrane
4And Zn (OH)
2Clean,, influence filtering traffic in order to avoid stop up fenestra.
The cold rolling zinc-containing water water quality of table 1
| Content | Numerical value |
| Contain zinc concentration/(mgL -1) | ??≤800 |
| ??pH | ??1～5 |
| ??SO 4 2-/(mg·L -1) | ??≤23000 |
| ??TFe/(mg·L -1) | ??≤50 |
| Free acid/(mgL -1) | ??≤450 |
Table 2 effluent quality (unit: mg/L)
| Content | Operation mean value | The environmental protection standard value |
| ??Zn 2+/(mg·L -1) | ??2.13 | ??≤4 |
| ??pH | ??8.5～9 | ??6～9 |
| ??SS/(mg·L -1) | ??＜1 | ??＜150 |
Claims (3)
1. the treatment process of a waste water from electric galvanization in cold rolling, may further comprise the steps: the high zinc concentration waste water of being discharged by cold rolling electroplating zinc unit enters the neutralization reaction pond, with industrial slaked lime is the neutralizing agent neutralization, wastewater pH brings up to 8.5～9 by 1～2, make solid-liquid separation through the thin film fluid strainer then, filter the rear filtrate qualified discharge, mud send sludge treating system to handle.
2. the treatment process of a kind of waste water from electric galvanization in cold rolling according to claim 1, it is characterized in that: described slaked lime, the lime milk concentration for preparing are 8%～10%.
3. the treatment process of a kind of waste water from electric galvanization in cold rolling according to claim 1, it is characterized in that: described neutralization reaction pond, retention time of sewage are 5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810117788A CN101643264A (en) | 2008-08-06 | 2008-08-06 | Method for treating waste water from electric galvanization in cold rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810117788A CN101643264A (en) | 2008-08-06 | 2008-08-06 | Method for treating waste water from electric galvanization in cold rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101643264A true CN101643264A (en) | 2010-02-10 |
Family
ID=41655356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810117788A Pending CN101643264A (en) | 2008-08-06 | 2008-08-06 | Method for treating waste water from electric galvanization in cold rolling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101643264A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105417812A (en) * | 2014-08-21 | 2016-03-23 | 宝山钢铁股份有限公司 | Zero emission method of cold rolled zinc electroplating wastewater |
| CN105439315A (en) * | 2015-11-18 | 2016-03-30 | 苏浩强 | Acid electroplating effluent treatment device |
| CN113816526A (en) * | 2021-09-18 | 2021-12-21 | 武汉钢铁有限公司 | Water quenching water recycling treatment process for cold rolling continuous annealing unit |
-
2008
- 2008-08-06 CN CN200810117788A patent/CN101643264A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105417812A (en) * | 2014-08-21 | 2016-03-23 | 宝山钢铁股份有限公司 | Zero emission method of cold rolled zinc electroplating wastewater |
| CN105417812B (en) * | 2014-08-21 | 2018-03-09 | 宝山钢铁股份有限公司 | A kind of Zero emission method of waste water from electric galvanization in cold rolling |
| CN105439315A (en) * | 2015-11-18 | 2016-03-30 | 苏浩强 | Acid electroplating effluent treatment device |
| CN113816526A (en) * | 2021-09-18 | 2021-12-21 | 武汉钢铁有限公司 | Water quenching water recycling treatment process for cold rolling continuous annealing unit |
| CN113816526B (en) * | 2021-09-18 | 2023-02-28 | 武汉钢铁有限公司 | Water quenching water recycling treatment process for cold rolling continuous annealing unit |
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Open date: 20100210 |