CN102452745A - Treatment process of waste water containing heavy metal - Google Patents
Treatment process of waste water containing heavy metal Download PDFInfo
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- CN102452745A CN102452745A CN2010105190930A CN201010519093A CN102452745A CN 102452745 A CN102452745 A CN 102452745A CN 2010105190930 A CN2010105190930 A CN 2010105190930A CN 201010519093 A CN201010519093 A CN 201010519093A CN 102452745 A CN102452745 A CN 102452745A
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- waste water
- heavy metal
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- precipitation
- containing waste
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Abstract
The invention discloses a treatment process of waste water containing heavy metal, which comprises: an adjustment step, wherein acid and alkali adjustment of waste water containing heavy metal is performed, and the waste water is adjusted to be alkaline; a precipitation reaction step, wherein a hydroxide precipitator is added into the waste water containing heavy metal, and the hydroxide precipitator combines with heavy metal ions in the waste water to generate a hydroxide precipitate; a mechanical stirring step, wherein the waste water with the added hydroxide precipitator is stirred so as to allow the hydroxide to fully diffuse in the waste water; a precipitation step, wherein solid-liquid separation of the hydroxide precipitate is realized in a precipitation tank; a filtration step, wherein the hydroxide precipitate is filtered by using a filter screen; a readjustment step, wherein acid and alkali adjustment of the filtered waste water is performed again, and the waste water is adjusted to be neutral. With the technical scheme of the invention, heavy metal ions in waste water containing heavy metal can be removed effectively, and environment pollution is prevented.
Description
Technical field
The present invention relates to technical field of waste water processing, relate in particular to a kind of treatment process of heavy metal-containing waste water.
Background technology
Heavy metal-containing waste water is meant the waste water that contains heavy metal ion of discharging in the Industrial processes such as mining and metallurgy, machinofacture, chemical industry, electronics, instrument.Heavy metal (like iron content, copper, cadmium, nickel, mercury, zinc etc.) waste water is that environmental pollution the most seriously and to the mankind endangers maximum trade effluent.
Because metal is dissolved in the waste water with ionic condition in the heavy metal-containing waste water, can not decomposes through physical environment and destroy, if therefore arbitrarily heavy metal-containing waste water is discharged in the physical environment and will causes huge threat to physical environment and human beings'health.Because the heavy metal ion in this type of waste water is to be dissolved in the waste water, can't remove through modes such as simple deposition, filtrations, therefore traditional waste water treatment process can't be used to handle heavy metal-containing waste water.
To handle effectively heavy metal-containing waste water, must remove heavy metal ion wherein.
Summary of the invention
The present invention is intended to propose a kind of treatment process to heavy metal-containing waste water, utilizes chemical reaction that the heavy metal ion in the waste water is cemented out and form the solid precipitation thing and removes.
According to the present invention, a kind of treatment process of heavy metal-containing waste water is proposed, comprise following step:
Regulating step carries out acid-alkali accommodation to heavy metal-containing waste water, is adjusted to alkalescence;
The precipitin reaction step adds the precipitation of hydroxide agent in heavy metal-containing waste water, combines the generation precipitation of hydroxide with heavy metal ion in the waste water;
The mechanical stirring step stirs the waste water that has added the precipitation of hydroxide agent, makes oxyhydroxide fully be diffused in the waste water;
Settling step makes precipitation of hydroxide realize solid-liquid separation in settling tank;
Filtration step uses filtering net to filter precipitation of hydroxide;
The re-adjustment step to carrying out acid-alkali accommodation once more through filtering waste water, is adjusted to neutrality.
Regulating step comprises: in heavy metal-containing waste water, add alkali, regulate pH value to 9～10 of heavy metal-containing waste water.
Wherein the churning time of mechanical stirring step is 10-20 minute.
Adopt technical scheme of the present invention, can remove the heavy metal ion in the heavy metal-containing waste water effectively, avoid environment is polluted.
Description of drawings
Fig. 1 is the schema according to the treatment process of heavy metal-containing waste water of the present invention.
Embodiment
Because metals ion can't directly be removed from waste water, can only change its materialization form, and then remove.The present invention utilizes chemical reaction to convert metals ion to the solid precipitation thing and removes.
With reference to shown in Figure 1, the present invention has disclosed a kind of treatment process of heavy metal-containing waste water, comprising:
S101. regulating step carries out acid-alkali accommodation to heavy metal-containing waste water, is adjusted to alkalescence.In one embodiment, in heavy metal-containing waste water, add alkali among the step S101, regulate pH value to 9～10 of heavy metal-containing waste water, the environment of meta-alkalescence helps in follow-up step, adding oxyhydroxide and forms precipitation of hydroxide.
S102. precipitin reaction step adds the precipitation of hydroxide agent in heavy metal-containing waste water, combines the generation precipitation of hydroxide with heavy metal ion in the waste water.Because the oxyhydroxide (for example ironic hydroxide, verditer) of most heavy metal ion is flocks, therefore can heavy metal ion be come out to form solid-state flocks from the waste water displace through adding the precipitation of hydroxide agent.
S103. the mechanical stirring step stirs the waste water that has added the precipitation of hydroxide agent, makes oxyhydroxide fully be diffused in the waste water.In order to make the precipitation of hydroxide agent fully contact with waste water, adopt mechanical stirring, in one embodiment, the churning time of mechanical stirring step is 10-20 minute.
S104. settling step makes precipitation of hydroxide realize solid-liquid separation in settling tank.Because mostly precipitation of hydroxide is flocks, therefore need provide enough STs to make the liquid of precipitation of hydroxide in waste water realize solid-liquid separation.This step S104 realizes in a settling tank usually.
S105. filtration step uses filtering net to filter precipitation of hydroxide.After accomplishing deposition, use filtering net to filter, through basically no longer containing heavy metal ion in the waste water of filtering net, tackle and heavy metal ion all forms precipitation of hydroxide and be filtered net.
S106. the re-adjustment step to carrying out acid-alkali accommodation once more through filtering waste water, is adjusted to neutrality.Because the pH value with waste water in step S101 has been adjusted to 9～10 of meta-alkalescence, after removing heavy metal ion, the pH value of the waste water after also needing to filter is adjusted near neutral, to meet emission standards again.
Adopt technical scheme of the present invention, can remove the heavy metal ion in the heavy metal-containing waste water effectively, avoid environment is polluted.
Claims (3)
1. the treatment process of a heavy metal-containing waste water is characterized in that, comprising:
Regulating step carries out acid-alkali accommodation to heavy metal-containing waste water, is adjusted to alkalescence;
The precipitin reaction step adds the precipitation of hydroxide agent in heavy metal-containing waste water, combines the generation precipitation of hydroxide with heavy metal ion in the waste water;
The mechanical stirring step stirs the waste water that has added the precipitation of hydroxide agent, makes oxyhydroxide fully be diffused in the waste water;
Settling step makes precipitation of hydroxide realize solid-liquid separation in settling tank;
Filtration step uses filtering net to filter precipitation of hydroxide;
The re-adjustment step to carrying out acid-alkali accommodation once more through filtering waste water, is adjusted to neutrality.
2. the treatment process of heavy metal-containing waste water as claimed in claim 1 is characterized in that, said regulating step comprises:
In heavy metal-containing waste water, add alkali, regulate pH value to 9～10 of heavy metal-containing waste water.
3. the treatment process of heavy metal-containing waste water as claimed in claim 1 is characterized in that,
The churning time of said mechanical stirring step is 10-20 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105190930A CN102452745A (en) | 2010-10-26 | 2010-10-26 | Treatment process of waste water containing heavy metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105190930A CN102452745A (en) | 2010-10-26 | 2010-10-26 | Treatment process of waste water containing heavy metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102452745A true CN102452745A (en) | 2012-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105190930A Pending CN102452745A (en) | 2010-10-26 | 2010-10-26 | Treatment process of waste water containing heavy metal |
Country Status (1)
| Country | Link |
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| CN (1) | CN102452745A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819021A (en) * | 2014-02-27 | 2014-05-28 | 南昌航空大学 | Method for processing heavy metal waste pipe |
| CN105621569A (en) * | 2015-12-30 | 2016-06-01 | 北京碧水源膜科技有限公司 | Device and method for treating reverse osmosis membrane production wastewater |
| CN110171886A (en) * | 2019-04-22 | 2019-08-27 | 昆明理工大学 | A method of waste acid containing arsenic is disposed using copper ashes step |
-
2010
- 2010-10-26 CN CN2010105190930A patent/CN102452745A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819021A (en) * | 2014-02-27 | 2014-05-28 | 南昌航空大学 | Method for processing heavy metal waste pipe |
| CN105621569A (en) * | 2015-12-30 | 2016-06-01 | 北京碧水源膜科技有限公司 | Device and method for treating reverse osmosis membrane production wastewater |
| CN110171886A (en) * | 2019-04-22 | 2019-08-27 | 昆明理工大学 | A method of waste acid containing arsenic is disposed using copper ashes step |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120516 |