CN1418831A - Method for treating acidic waste-water contg. nonferrous metals - Google Patents
Method for treating acidic waste-water contg. nonferrous metals Download PDFInfo
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- CN1418831A CN1418831A CN 02139855 CN02139855A CN1418831A CN 1418831 A CN1418831 A CN 1418831A CN 02139855 CN02139855 CN 02139855 CN 02139855 A CN02139855 A CN 02139855A CN 1418831 A CN1418831 A CN 1418831A
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Abstract
The new process for treating acidic waste water containing non-ferrous metal ions includes two-stage treatment method, one of them adopts lime neutralization treatment step, the lime milk can be added into said acidic waste water to make the pH value of waste water up to 7.5-9, and another method is a ferric polysulfate precipitation treatment step, the ferric polysulfate is added into the supernatant fluid of the waste water, and the pH value of said waste water can be up to 7.5-9.
Description
Technical field
The present invention relates to a kind of method of handling non-ferrous metal acid waste water, belong to waste water treatment process.
Background technology
Chinese invention patent 01145534.9 discloses a kind of process for treating acidic sewage with high-density mud, and it is made up of device systems such as first reactor, second reactor, aeration tank, settling vessel, pressure filter.Adopt mud reflux, to wherein adding the neutralizing agent technology, make neutralizing agent be adsorbed in the sludge carrier surface, utilize in this carrier again and waste water, make the precipitate metal hydroxides of the big particle diameter of multiple metal ion formation high-density in the waste water, improved the solid content of sludge settling efficient and mud, reduce the sludge dewatering time, reduce the wastewater treatment expense.Invention suits to be extensive use of in industries such as iron and steel, mine, chemical industry, plating.
Aforesaid method belongs to one section neutralisation, and for containing non-ferrous metal ionic acid waste water, when metal ion content was higher, one section neutralisation was difficult to reach national grade one discharge standard, thereby, rivers are still had pollution, this is the weak point of one section neutralisation.
Summary of the invention
The object of the present invention is to provide a kind of two-phase method to handle the novel process of non-ferrous metal acid waste water, it is to adopt one section lime neutralization to add two sections polyaluminum sulfate iron precipitation processes to handle non-ferrous metal acid waste water, make it to reach national grade one discharge standard, to overcome the deficiency of one section neutralisation.
Technical solution of the present invention is to send containing non-ferrous metal ionic acid waste water into the neutralization reaction pond after desilting, homogenizing, and add milk of lime to this reaction tank, in the lime and back liquid send the inclined-plate clarifying basin post precipitation, to wherein adding bodied ferric sulfate, give another inclined-plate clarifying basin precipitate and separate again, supernatant liquor can efflux or do industrial backwater and use.
Method of the present invention is characterized in that it is made up of lime neutralizing treatment and two steps of bodied ferric sulfate precipitation process, and described lime neutralizing treatment step is that milk of lime is added in this acid waste water, makes the waste water pH value after the neutralization reach 7.5-9; Described bodied ferric sulfate precipitation process step is that bodied ferric sulfate is added in the wastewater supernatant fluid of milk of lime neutralization and post precipitation, makes the waste water pH value of polymerization post precipitation reach 7.5-9.
The concentration of described milk of lime is 6-10%.
The concentration of described bodied ferric sulfate is 5-20%.
The invention has the beneficial effects as follows: through the acid waste water that two-phase method is handled, average annual 95% can reach national grade one discharge standard, and one section neutralisation has only 80% to reach state three grade emissioning standard every year; The recycling water utilization rate of section method is 300M
3/ hour, two-phase method is then brought up to 500M
3/ hour, simultaneously, the amount of pollutant that enters rivers has also reduced.
It below is one section lime neutralisation (one-stage process) and the neutralize processing empirical average contrast table as a result of bodied ferric sulfate precipitator method (two-phase method) of lime.
Acid waste water 500ml, composition (mg/l): Cu3.64, Pb5.74, Zn157.64, Cd6.90, PH3.7.
| Method | PH value control | The quantity of slag (%) | The milk of lime consumption (ml) of concentration 8% | (mg/l) purifies waste water | |||||
| ????Cu | ????Pb | ????Zn | ??Cd | ??PH | |||||
| Two-phase method | One section | ????7.5-9 | ??73 | ??14.42 | ??0.120 | ??0.478 | ??1.278 | ??0.04 | ??7.67 |
| Two sections | ????7.5-8.5 | ??27 | (5.76 the bodied ferric sulfate of concentration 10%) | ||||||
| One-stage process | ????7-9 | Total quantity of slag lacks 30% approximately | ??11.25 | ??0.165 | ??0.762 | ??2.495 | ??0.06 | ??7.92 | |
As seen from the above table, lime neutralization---the bodied ferric sulfate precipitator method (two-phase method) have more significantly raising than lime neutralisation (one-stage process) on treatment effect, wherein, lead, zinc, cadmium reduce by 37.27%, 48.78%, 33.33% respectively, and because first section in the two-phase method separates the quantity of slag more than 70%, alleviate second section processing load greatly, be suitable for overproof waste water quality equally.
Description of drawings
Accompanying drawing is the process flow sheet that two-phase method of the present invention is handled non-ferrous metal acid waste water.
Embodiment
Below in conjunction with accompanying drawing the present invention and embodiment thereof are described in further detail.
Example 1:
Referring to accompanying drawing, accompanying drawing is the process flow sheet that two-phase method of the present invention is handled non-ferrous metal acid waste water, contain non-ferrous metal ionic acid waste water, through desilting, enter mixing pit after the homogenizing, milk of lime is added in this mixing pit, carry out one section lime neutralization, neutralization back liquid send reaction tank and inclined-plate clarifying basin, and this settling tank supernatant goes into to mix agitated pool, polyaddition ferric sulfate carries out two sections poly-iron precipitations in this agitated pool, mixed solution advances another inclined-plate clarifying basin, and supernatant returns and uses or efflux, the underflow entrance pressure filter press filtration of balancing reservoir underflow and other operations, filter residue send production system, and filtrate is then returned balancing reservoir.
Non-ferrous metal acid waste water flow 400M
3/ hour (continuous flow), waste water composition (mg/l); Cu3.88, Pb14.63, Cd12.65, Zn139.29, pH value 5.0.
One section lime neutralization: in mixing pit, add concentration and be 6% milk of lime, reach at 8.5 o'clock to pH value and end, in the sample examination and back composition (mg/l): Cu0.26, Pb1.22, Cd0.45, Zn17.86, pH value 8.5.
Two sections bodied ferric sulfate precipitations: input concentration is 10% bodied ferric sulfate 200PPM (amounting to 80kg/ hour) in mixing agitated pool, the supernatant liquor composition (mg/l) of sample examination polymerization post precipitation: Cu0.20, Pb0.91, Cd0.08, Zn1.43, pH value 8.5.
Example 2:
Waste water composition (mg/l): Cu1.82, Pb9.40, Cd7.12, Zn138.48, pH value 3.5.
Lime milk concentration 6% reaches till 7.5 to pH value, in the sample examination and back supernatant liquor composition (mg/l): Cu0.40, Pb1.04, Cd0.16, Zn2.14, pH value 7.5.
The bodied ferric sulfate 70PPM of concentration 5% (amounting to 28kg/ hour), the supernatant liquor composition (mg/l) of sample examination polymerization post precipitation: Cu0.28, pb0.97, Cd0.07, Zn1.93, pH value 7.5, all the other are with example 1.
Example 3
Waste water composition (mg/l): Cu5.65, Pb11.79, Cd6.89, Zn629.65, pH value 4.0.
Lime milk concentration 10% reaches till 9.0 to pH value, in the sample examination and back supernatant liquor composition (mg/l): Cu0.28, Pb1.31, Cd0.16, Zn9.55, pH value 9.0.
The bodied ferric sulfate 200PPM of concentration 20%, the supernatant liquor composition (mg/l) of sample examination polymerization post precipitation: Cu0.24, Pb0.92, Cd0.07, Zn2.00, pH value 9.0, all the other are with example 1.
Claims (3)
1, a kind of method of handling non-ferrous metal acid waste water, it is characterized in that it is made up of lime neutralizing treatment and two steps of bodied ferric sulfate precipitation process, described lime neutralizing treatment step is that milk of lime is added in this acid waste water, makes the waste water pH value after the neutralization reach 7.5-9; Described bodied ferric sulfate precipitation process step is that bodied ferric sulfate is added in the wastewater supernatant fluid of milk of lime neutralization and post precipitation, makes the waste water pH value of polymerization post precipitation reach 7.5-9.
2, by the described method of claim 1, the concentration that it is characterized in that described milk of lime is 6-10%.
3, by the described method of claim 1, the concentration that it is characterized in that described bodied ferric sulfate is 5-20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139855 CN1218889C (en) | 2002-12-17 | 2002-12-17 | Method for treating acidic waste-water contg. nonferrous metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139855 CN1218889C (en) | 2002-12-17 | 2002-12-17 | Method for treating acidic waste-water contg. nonferrous metals |
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| CN1418831A true CN1418831A (en) | 2003-05-21 |
| CN1218889C CN1218889C (en) | 2005-09-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560012A (en) * | 2009-03-17 | 2009-10-21 | 杭州诚洁环保有限公司 | Acidic chemical wastewater pretreating agent and preparation method thereof |
| CN102295372A (en) * | 2011-05-18 | 2011-12-28 | 山东恒邦冶炼股份有限公司 | Method for treating acidic smelting waste water containing high arsenic and heavy metal ions |
| CN101234826B (en) * | 2007-08-29 | 2012-12-12 | 大冶有色金属公司 | Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837435B (en) * | 2009-03-20 | 2011-09-21 | 宝山钢铁股份有限公司 | Method for preparing casting covering slag by utilizing stainless steel cold-rolling pickling wastewater |
-
2002
- 2002-12-17 CN CN 02139855 patent/CN1218889C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234826B (en) * | 2007-08-29 | 2012-12-12 | 大冶有色金属公司 | Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water |
| CN101560012A (en) * | 2009-03-17 | 2009-10-21 | 杭州诚洁环保有限公司 | Acidic chemical wastewater pretreating agent and preparation method thereof |
| CN102295372A (en) * | 2011-05-18 | 2011-12-28 | 山东恒邦冶炼股份有限公司 | Method for treating acidic smelting waste water containing high arsenic and heavy metal ions |
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| CN1218889C (en) | 2005-09-14 |
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