CN104016436A - Zinc-containing wastewater treatment method - Google Patents
Zinc-containing wastewater treatment method Download PDFInfo
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- CN104016436A CN104016436A CN201410259834.4A CN201410259834A CN104016436A CN 104016436 A CN104016436 A CN 104016436A CN 201410259834 A CN201410259834 A CN 201410259834A CN 104016436 A CN104016436 A CN 104016436A
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- tricalcium aluminate
- zinc
- adsorption
- wastewater
- zinc ions
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Abstract
The invention discloses a zinc-containing wastewater treatment method, in particular relating to application of tricalcium aluminate to removal of zinc ions from wastewater and belonging to the field of wastewater treatment in environmental protection. The method comprises the following steps of adding a certain amount of tricalcium aluminate into a Zn(NO3)2 solution for removing zinc ions. A result shows that the maximum adsorption amount of the zinc ions by tricalcium aluminate is 13.73mmol/g, the adsorption saturation state is achieved within about 2 hours, the adsorption amount is large, and the removal effect is good. A solid product obtained after the zinc ions are adsorbed by tricalcium aluminate can be added into organic or inorganic anion wastewater for adsorbing organic or inorganic anion pollutants in the wastewater. The method has the advantages of being quick, efficient, large in adsorption amount, high in selectivity and the like; the process is simple, and the operation is convenient; heavy metal ions are quickly enriched, and adsorption products can be recycled, so that high-added-value recycling of the pollutants is realized based on waste control by waste.
Description
Technical field
The present invention is a kind for the treatment of process of zinc-containing water, is specifically related to tricalcium aluminate application aspect zine ion removal in waste water, belongs to field of waste water treatment in environment protection.
Background technology
A large amount of zinc all can be discharged in zinc factory and other industry such as Electroplate Factory, printing and dyeing mill, pig farm etc.Although the trace element that zinc is needed by human is also that in animal and plant growth, but indispensable trace element a large amount of zinc can be to bio toxigenicities, for example allergy, sore muscle, expiratory dyspnea, malaise, gastroenteropathy, tuberculosis, growth retardation are even carcinogenic.In addition, zinc-containing water pollutes features such as having toxic effect continues for a long time, biological non-degradable, and can enter organism accumulation by food chain effect, thereby causes various diseases and disorder.It is the most serious and the mankind are endangered to one of maximum trade effluent that heavy metal wastewater thereby has become environmental pollution, therefore seeks a kind of method of zinc of effectively removing in waste water imperative.
The method of administering heavy metal polluted waste water comprise physics, chemistry with biology etc. the whole bag of tricks.Common are chemical precipitation method, electrolytic process, ion exchange method, membrane separation technique, active carbon adsorption technology etc.Chemical precipitation method operation is relatively simple, cost is low, but can produce a large amount of mud, and poor for the heavy metal containing wastewater treatment effect of high density.Electrochemical treatment can reclaim metal, but running cost is high.Reverse osmosis method water outlet can reuse, but needs elevated pressures, and film easily stops up.Ion exchange method treatment effect is good, and metal can reclaim, but responsive to particulate matter, and resin price is more expensive.Biotechnology is processed has the advantages such as improvement that cost is low, secondary pollution is few, be conducive to ecotope, but microorganism culturing and domestication time are long, wayward, and mostly selective, and many places are in the laboratory study stage at present.
Absorption method is to utilize a kind of method of sorbent material absorption heavy metal in waste water, and traditional sorbent material has gac, zeolite, clay mineral and organism or derivatives thereof.The high adsorption capacity of gac, high to heavy metal removing rate, but expensive, work-ing life is short.By organism and derivative thereof, to the adsorption of heavy metal ion in water, can remove part heavy metal, but adsorptive capacity is little, and is difficult to recycle.Found in the last few years that mineral material had stronger adsorptive power, wherein natural zeolite is the earliest for the mineral material of heavy metal containing wastewater treatment, but its complex disposal process, thereby be difficult to promote.Tricalcium aluminate is extensively present in discarded cement material, and its aqueous solution is strong basicity, and can aquation form calcium base layered double hydroxide (CaAl-LDH).
Summary of the invention
The object of the invention is to overcome prior art deficiency, a kind for the treatment of process of zinc-containing water is provided.The present invention has fast, efficient, adsorptive capacity is large, selectivity advantages of higher, rapidly enriched zine ion, again reusable edible product, realize the science administration idea of " treatment of wastes with processes of wastes against one another ", technique is simple, easy to operate, in zinc-containing water process field, will have unprecedented development space.
The present invention is achieved like this, and a kind for the treatment of process of zinc-containing water is characterized in that a certain amount of tricalcium aluminate to put in zinc-containing water, and vibration, makes tricalcium aluminate fully dissolve and be evenly distributed rapidly, removes the zine ion in solution.
The removal process of heavy metal of the present invention is as follows:
(1) tricalcium aluminate is water-soluble, and hydration occurs, and forms the laminar structured intermediate product of inferior stable state, and calcium base layered double hydroxide (CaAl-LDH), mainly comprises 4CaOAl
2o
319H
2o (is C
4aH
19), 2CaOAl
2o
38H
2o (is C
2aH
8), they are six square piece layered crystal structures.In addition,, because tricalcium aluminate has certain solvability, can discharge a part of Ca after water-soluble
2+and Al
3+, and solution is stronger alkalescence (pH=11.8), therefore the Al in solution
3+with Al (OH)
4 -form exist.
(2) Zn in solution
2+can replace intermediate product 4CaOAl
2o
319H
2o and 2CaOAl
2o
38H
2ca on O plymetal
2+enter plymetal, form ZnAl-LDH, and Ca on plymetal
2+be discharged in solution.
(3) Zn in solution
2+the Al (OH) that can discharge with tricalcium aluminate
4 -there is precipitin reaction, form ZnAl-LDH.
The invention has the beneficial effects as follows:
(1) compare with other sorbent material, tricalcium aluminate is large to the adsorptive capacity of heavy metal, and treatment effect is good.
(2) tricalcium aluminate, extensively in discarded cement material, is removed cost lower.
(3) adsorbed product is layered double hydroxide (LDH), can be added to again in organic or inorganic negatively charged ion waste water and continue to use, and the organic or inorganic anionic pollutant in absorption waste water, reusable edible, realizes " treatment of wastes with processes of wastes against one another ".
Accompanying drawing explanation
Fig. 1 is the isothermal adsorption curve of tricalcium aluminate to zine ion;
Fig. 2 is the curve of adsorption kinetics of tricalcium aluminate to zine ion;
Fig. 3 is the XRD figure spectrum of solid product after tricalcium aluminate absorption zine ion;
Fig. 4 is the SEM collection of illustrative plates of solid product after tricalcium aluminate absorption zine ion.
Embodiment
For the present invention is described better, be convenient to understand technical scheme of the present invention, below in conjunction with example, the present invention is further described.
Embodiment 1
Compound concentration gradient be respectively 50,100,200,400,600,800, the Zn (NO of 1000ppm
3)
2each 20mL of solution, then respectively to the Zn (NO of each concentration gradient
3)
2in solution, vibration limit in limit slowly adds 0.02g tricalcium aluminate, after adding, shakes up fast.Again sample is put into the water bath with thermostatic control vibrator of 25 ℃, vibrated 16 hours.Finally sample is carried out to centrifugal, filtration, get supernatant liquid check weighing concentration of metal ions, the solid product the arriving washing of filtration, oven dry, carry out XRD detection.Detect absorption front and back Zn
2+concentration, show that tricalcium aluminate is to Zn
2+maximal absorptive capacity be about 13.73mmol/g, suction type is Langmuir absorption.Figure 1 shows that the isothermal adsorption curve of tricalcium aluminate to zine ion, result shows that at 25 ℃, tricalcium aluminate is to Zn
2+maximal absorptive capacity be about 13.73mmol/g, suction type meets Langmuir Adsorption Model most.Figure 2 shows that the curve of adsorption kinetics of tricalcium aluminate to zine ion, result shows that at 25 ℃, tricalcium aluminate is to Zn
2+adsorptive capacity in 2 hours, along with the increase in reaction times, increase sharply, about 2 hours, reach absorption saturated.Figure 3 shows that the XRD figure spectrum of solid product after tricalcium aluminate absorption zine ion, result shows first to generate the ZnAl-LDH that interlayer anion is nitrate radical after tricalcium aluminate absorption zine ion, along with the increase in reaction times, product finally becomes the ZnAl-LDH that interlayer anion is carbonate.The SEM collection of illustrative plates that Figure 4 shows that solid product after tricalcium aluminate absorption zine ion, result shows that adsorbed product is laminar structured.
Embodiment 2
Prepare the Zn (NO that 10 groups of 20mL concentration are 1000ppm
3)
2solution then slowly adds 0.02g tricalcium aluminate respectively in each group heavy metal solution, and while adding, vibration, makes tricalcium aluminate uniform dissolution.It is 5min, 10min, 15min, 30min, 45min, 60min, 120min, 240min, 480min, 960min that 10 sampling time points are set, and every time point just takes out one group of corresponding Zn (NO
3)
2solution example, carries out centrifugal, filtration, gets supernatant liquid and surveys Zn
2+concentration.By result, show that tricalcium aluminate is to Zn
2+be adsorbed on about 2 hours and reach capacity, adsorptive capacity is about 13.73mmol/g, advantages of good adsorption effect.According to detected result, drawn the curve of adsorption kinetics of tricalcium aluminate as shown in Figure 2 to zine ion.
Claims (3)
1. a treatment process for zinc-containing water, is characterized in that a certain amount of tricalcium aluminate to put in zinc-containing water, and vibration, makes tricalcium aluminate fully dissolve and be evenly distributed rapidly.
2. according to the treatment process of a kind of zinc-containing water described in right 1, it is characterized in that tricalcium aluminate dosage is 1g/L.
3. according to the treatment process of a kind of zinc-containing water described in right 1, it is characterized in that vibrating 16 hours in the water bath with thermostatic control vibrator of 25 ℃.
Priority Applications (1)
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|---|---|---|---|
| CN201410259834.4A CN104016436A (en) | 2014-06-12 | 2014-06-12 | Zinc-containing wastewater treatment method |
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|---|---|---|---|
| CN201410259834.4A CN104016436A (en) | 2014-06-12 | 2014-06-12 | Zinc-containing wastewater treatment method |
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|---|---|
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Family
ID=51433497
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020011447A1 (en) * | 1999-09-30 | 2002-01-31 | Waldmann John J. | Chemical composition for treatment of nitrate and odors from water streams and process wastewater treatment |
| CN101519240A (en) * | 2009-02-24 | 2009-09-02 | 上海大学 | Method for treating wastewater containing Cr(VI) |
| CN102060366A (en) * | 2010-11-26 | 2011-05-18 | 武汉理工大学 | Composite for treating waste water containing cadmium compound and preparation method thereof |
| CN102079563A (en) * | 2010-12-21 | 2011-06-01 | 东华大学 | Regenerative coagulant, and preparation method and using method thereof |
-
2014
- 2014-06-12 CN CN201410259834.4A patent/CN104016436A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020011447A1 (en) * | 1999-09-30 | 2002-01-31 | Waldmann John J. | Chemical composition for treatment of nitrate and odors from water streams and process wastewater treatment |
| CN101519240A (en) * | 2009-02-24 | 2009-09-02 | 上海大学 | Method for treating wastewater containing Cr(VI) |
| CN102060366A (en) * | 2010-11-26 | 2011-05-18 | 武汉理工大学 | Composite for treating waste water containing cadmium compound and preparation method thereof |
| CN102079563A (en) * | 2010-12-21 | 2011-06-01 | 东华大学 | Regenerative coagulant, and preparation method and using method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘增刚 等: "含铀废水中镉的处理", 《矿业工程研究》, vol. 28, no. 3, 30 September 2011 (2011-09-30) * |
| 张光明、张信芳、张盼月: "《城市污泥资源化技术进展》", 30 April 2006, 北京：化学工业出版社, article "1.固化/稳定化技术", pages: 166-167 * |
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Application publication date: 20140903 |