CN112499900A - Method for removing nickel from ammonia-containing wastewater - Google Patents
Method for removing nickel from ammonia-containing wastewater Download PDFInfo
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- CN112499900A CN112499900A CN202011357071.9A CN202011357071A CN112499900A CN 112499900 A CN112499900 A CN 112499900A CN 202011357071 A CN202011357071 A CN 202011357071A CN 112499900 A CN112499900 A CN 112499900A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses a method for removing nickel from ammonia-containing wastewater, which comprises the following steps: (1) adjusting the pH value of the ammonia-containing wastewater to 7-8, adding nitrosobacteria into the ammonia-containing wastewater after the pH value is adjusted, heating to 30-50 ℃, aerating once every 3-5 min, reacting for 5-6 h, and stopping aeration to obtain a mixture; adding the mixture into denitrifying bacteria and continuously stirring to obtain a first filtrate; (2) adjusting the pH value of the first filtrate to 3-4, adding a sodium sulfide solution with the mass fraction of 12% -15% into the first filtrate, stirring and filtering to obtain a precipitate and a second filtrate; (3) and adding magnesium hydroxide into the second filtrate until the pH value is 8-9, stirring for 3-4 h, and filtering to obtain a treated liquid meeting the discharge standard of the ammonia-containing wastewater. The invention can effectively reduce the concentration of ammonium ions and nickel ions in the wastewater and can solve the environmental protection problem of the waste liquid in the process of discharging the ammonia-containing wastewater.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for removing nickel from ammonia-containing wastewater.
Background
The prior method for treating the ammonia-containing wastewater mainly comprises an air stripping method, an ion exchange method, a chlorine introducing method, a biological method and a steam stripping method. Wherein, the air stripping method has simple process and the defects of high energy consumption and pollutant transfer; the ion exchange method, which uses ion exchange resin to absorb ammonium ions and uses sulfuric acid to elute, has strong selectivity, but large medicament consumption and high treatment cost; the chlorine introducing method is used for oxidizing ammonium by using chlorine, and a large amount of chlorine is required to be introduced in the method, so that secondary pollution to the environment is easily caused; the biological method converts ammonia into nitrogen by utilizing nitration and denitrification reactions, has good effect, but needs a carbon source; stripping, by distillation of NH3And (3) from the top, ammonia water is produced through condensation. Considering various factors such as production cost and the like, the combined use of the chemical precipitation method and the biological method is more economical and has good treatment effect.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides the method for treating the ammonia-containing wastewater, which has the advantages of short production flow, low production cost and good ammonia and nickel ion removal effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for removing nickel from ammonia-containing wastewater, characterized in that the method comprises the following steps:
(1) adjusting the pH value of the ammonia-containing wastewater to 7-8, adding nitrosobacteria into the ammonia-containing wastewater after the pH value is adjusted, heating to 30-50 ℃, aerating once every 3-5 min, reacting for 5-6 h, and stopping aeration to obtain a mixture; adding the mixture into denitrifying bacteria, continuously stirring, stirring for 5-6 h, and filtering to obtain a first filtrate;
(2) adjusting the pH value of the first filtrate to 3-4, adding a sodium sulfide solution with the mass fraction of 12% -15% into the first filtrate, stirring for 3-4 h, and filtering to obtain a precipitate and a second filtrate; the volume ratio of the first filtrate to the sodium sulfide solution is (10-12) to 1;
(3) and adding magnesium hydroxide into the second filtrate until the pH value is 8-9, stirring for 3-4 h, and filtering to obtain a treated liquid meeting the discharge standard of the ammonia-containing wastewater.
The method for removing nickel from ammonia-containing wastewater is characterized in that the concentration of ammonium ions in the ammonia-containing wastewater is 0.8 g/L-1.5 g/L, and the concentration of nickel ions in the ammonia-containing wastewater is 0.084 g/L-0.98 g/L.
The method for removing nickel from ammonia-containing wastewater is characterized in that the liquid-solid ratio of the ammonia-containing wastewater after pH adjustment in the step (1) to nitrosobacteria is (3-4): 1.
The method for removing nickel from ammonia-containing wastewater is characterized in that the liquid-solid ratio of the mixture to the denitrifying bacteria in the step (1) is (5-6): 1.
The method for removing nickel from ammonia-containing wastewater is characterized in that the removal rate of ammonium ions in the treated liquid meeting the discharge standard of ammonia-containing wastewater obtained in the step (3) is higher than 95%, the removal rate of nickel ions is higher than 99%, the concentration of ammonium ions is less than 0.05g/L, and the concentration of nickel ions is less than 0.0008 g/L.
Compared with the prior art, the invention has the following beneficial technical effects: the method adopts a biological method to remove ammonia nitrogen ions in the ammonia-containing wastewater, can effectively reduce the content of ammonium ions in the ammonia-containing wastewater, eliminates the complexing action of the ammonium ions in the wastewater on heavy metal ions, adopts a vulcanization method to precipitate the metal ions in the ammonia-containing wastewater, further removes heavy metal elements in the ammonia-containing wastewater, filters the wastewater after reaction, adds magnesium hydroxide powder into filtrate, adjusts the pH value of the solution, and simultaneously precipitates and adsorbs the residual heavy metal ions in the wastewater. The removal rate of ammonium ions in the waste liquid treated by the method reaches more than 95 percent, the removal rate of nickel ions reaches more than 99 percent, the concentration of the ammonium ions in the treated liquid reaches less than 0.05g/L, and the concentration of the nickel ions reaches less than 0.0008 g/L.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the method for removing nickel from ammonia-containing wastewater of the invention comprises the following steps:
(1) adjusting the pH value of the ammonia-containing wastewater to 7-8, adding nitrosobacteria into the ammonia-containing wastewater after the pH value is adjusted, heating to 30-50 ℃, aerating once every 3-5 min, reacting for 5-6 h, and stopping aeration to obtain a mixture; adding the mixture into denitrifying bacteria, continuously stirring, stirring for 5-6 h, and filtering to obtain a first filtrate; the concentration of ammonium ions in the ammonia-containing wastewater is 0.8 g/L-1.5 g/L, and the concentration of nickel ions is 0.084 g/L-0.98 g/L. The liquid-solid ratio of the ammonia-containing wastewater after pH adjustment to the nitrosobacteria is (3-4): 1, wherein the liquid-solid ratio refers to the volume (m) of the ammonia-containing wastewater after pH adjustment3) The mass (kg) of nitrosobacteria. The liquid-solid ratio of the mixture to the denitrifying bacteria is (5-6): 1, and the liquid-solid ratio refers to the volume (m) of the compound3) The mass (kg) of the denitrifying bacteria.
(2) Adjusting the pH value of the first filtrate to 3-4, adding a sodium sulfide solution with the mass fraction of 12% -15% into the first filtrate, stirring for 3-4 h, and filtering to obtain a precipitate and a second filtrate; the volume ratio of the first filtrate to the sodium sulfide solution is (10-12) to 1;
(3) and adding magnesium hydroxide into the second filtrate until the pH value is 8-9, stirring for 3-4 h, and filtering to obtain a treated liquid meeting the discharge standard of the ammonia-containing wastewater. The removal rate of ammonium ions in the treated liquid meeting the discharge standard of the ammonia-containing wastewater is higher than 95%, the removal rate of nickel ions is higher than 99%, the concentration of the ammonium ions is less than 0.05g/L, the concentration of the nickel ions is less than 0.0008g/L, and the treated liquid meets the discharge standard of the ammonia-containing wastewater.
Example 1
NH in waste liquid generated by platinum refining4 +The concentration is 1.5g/L, Ni+The concentration is 0.58g/L, and the output of the wastewater per cycle is 1m3Pumping waste water produced by platinum refining into a reaction tank, adjusting the pH value of the waste water to be 7, adding 334kg of activated sludge into the waste water, heating to 42 ℃, aerating once every five minutes by a Roots blower, reacting for 6 hours, and stopping aeration to obtain a mixture; adding 167kg of denitrifying bacteria into the mixture, continuously stirring, stirring for 6h, and filtering to obtain a first filtrate. Adjusting the pH value of the first filtrate to 3, adding 110L of sodium sulfide solution with the mass fraction of 15% into the first filtrate, stirring for 3h, and filtering to obtain a precipitate and a second filtrate; magnesium hydroxide was added to the second filtrate to a solution pH of 8, stirred for 3h and filtered to obtain a treated liquid. The concentration of ammonium ions in the treated liquid is 0.046g/L, the concentration of nickel ions in the treated liquid is 0.0006g/L, and the treated liquid meets the discharge standard of ammonia-containing wastewater.
Example 2
NH in waste liquid generated by platinum refining4 +The concentration is 0.9g/L, Ni+The concentration is 0.32g/L, and the output of the wastewater per cycle is 1.2m3Pumping waste water produced by platinum refining into a reaction tank, adjusting the pH value of the waste water to be 8, adding 343kg of activated sludge into the waste water, heating to 38 ℃, aerating once every three minutes by using a Roots blower, reacting for 6 hours, and stopping aeration to obtain a mixture; adding 240kg of denitrifying bacteria into the mixture, continuously stirring, stirring for 6 hours, and filtering to obtain a first filtrate. Adjusting the pH value of the first filtrate to be 4, adding 144L of sodium sulfide solution with the mass fraction of 13% into the first filtrate, stirring for 3h, and filtering to obtain a precipitate and a second filtrate; magnesium hydroxide was added to the second filtrate to a solution pH of 9, and after stirring for 3 hours, filtration was performed to obtain a treated liquid. The concentration of ammonium ions in the treated liquid is 0.039g/L, the concentration of nickel ions in the treated liquid is 0.0005g/L, and the treated liquid meets the discharge standard of ammonia-containing wastewater.
Example 3
NH in waste liquid produced in platinum-palladium reduction post4 +The concentration is 1.4g/L, Ni+The concentration is 0.16g/L, and the amount of wastewater produced per day is 1.5m3Pumping waste water produced by platinum-palladium reduction into a reaction tank, adjusting the pH value of the waste water to be 7, adding 500kg of activated sludge into the waste water, heating to 35 ℃, aerating once every five minutes by using a Roots blower, reacting for 5 hours, and stopping aeration to obtain a mixture; 273kg of denitrifying bacteria is added to the mixture and stirred continuously for 6 hours, and then filtered to obtain a first filtrate. Adjusting the pH value of the first filtrate to 3, adding 135L of 14% sodium sulfide solution into the first filtrate, stirring for 3h, and filtering to obtain a precipitate and a second filtrate; magnesium hydroxide was added to the second filtrate to a solution pH of 8, stirred for 3h and filtered to obtain a treated liquid. The concentration of ammonium ions in the treated liquid is 0.041g/L, the concentration of nickel ions in the treated liquid is 0.0003g/L, and the treated liquid meets the discharge standard of ammonia-containing wastewater.
Claims (5)
1. A method for removing nickel from ammonia-containing wastewater, characterized in that the method comprises the following steps:
(1) adjusting the pH value of the ammonia-containing wastewater to 7-8, adding nitrosobacteria into the ammonia-containing wastewater after the pH value is adjusted, heating to 30-50 ℃, aerating once every 3-5 min, reacting for 5-6 h, and stopping aeration to obtain a mixture; adding the mixture into denitrifying bacteria, continuously stirring, stirring for 5-6 h, and filtering to obtain a first filtrate;
(2) adjusting the pH value of the first filtrate to 3-4, adding a sodium sulfide solution with the mass fraction of 12% -15% into the first filtrate, stirring for 3-4 h, and filtering to obtain a precipitate and a second filtrate; the volume ratio of the first filtrate to the sodium sulfide solution is (10-12) to 1;
(3) and adding magnesium hydroxide into the second filtrate until the pH value is 8-9, stirring for 3-4 h, and filtering to obtain a treated liquid meeting the discharge standard of the ammonia-containing wastewater.
2. The method for removing nickel from ammonia-containing wastewater according to claim 1, wherein the concentration of ammonium ions in the ammonia-containing wastewater is 0.8g/L to 1.5g/L, and the concentration of nickel ions in the ammonia-containing wastewater is 0.084g/L to 0.98 g/L.
3. The method for removing nickel from ammonia-containing wastewater according to claim 2, wherein the liquid-solid ratio of the ammonia-containing wastewater after the pH adjustment in the step (1) to the nitrosobacteria is (3-4): 1.
4. The method for removing nickel from ammonia-containing wastewater according to claim 3, wherein the liquid-solid ratio of the mixture to the denitrifying bacteria in the step (1) is (5-6): 1.
5. The method for removing nickel from ammonia-containing wastewater according to any one of claims 1 to 4, wherein the treated liquor obtained in the step (3) which meets the discharge standard of ammonia-containing wastewater has the ammonium ion removal rate of higher than 95%, the nickel ion removal rate of higher than 99%, the ammonium ion concentration of less than 0.05g/L and the nickel ion concentration of less than 0.0008 g/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011357071.9A CN112499900A (en) | 2020-11-26 | 2020-11-26 | Method for removing nickel from ammonia-containing wastewater |
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| CN202011357071.9A CN112499900A (en) | 2020-11-26 | 2020-11-26 | Method for removing nickel from ammonia-containing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735842A (en) * | 2022-03-07 | 2022-07-12 | 金川集团股份有限公司 | Method for removing heavy metals from ammonia-containing wastewater |
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| US20090180945A1 (en) * | 2008-01-15 | 2009-07-16 | Vale Inco Limited | Liquid and solid effluent treatment process |
| CN101723512A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Ammonia-contained waste water high-efficiency biochemical processing method |
| CN102260794A (en) * | 2011-05-23 | 2011-11-30 | 陕西华泽镍钴金属有限公司 | Process for recovering nickel by adding sodium sulfide in aqueous solution containing nickel and ammonium |
| CN105384277A (en) * | 2015-11-08 | 2016-03-09 | 成都育芽科技有限公司 | Treatment method for cobalt-nickel waste water |
| CN108395052A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | Method for efficiently treating coking residual ammonia water |
-
2020
- 2020-11-26 CN CN202011357071.9A patent/CN112499900A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090180945A1 (en) * | 2008-01-15 | 2009-07-16 | Vale Inco Limited | Liquid and solid effluent treatment process |
| CN101723512A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Ammonia-contained waste water high-efficiency biochemical processing method |
| CN102260794A (en) * | 2011-05-23 | 2011-11-30 | 陕西华泽镍钴金属有限公司 | Process for recovering nickel by adding sodium sulfide in aqueous solution containing nickel and ammonium |
| CN105384277A (en) * | 2015-11-08 | 2016-03-09 | 成都育芽科技有限公司 | Treatment method for cobalt-nickel waste water |
| CN108395052A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | Method for efficiently treating coking residual ammonia water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735842A (en) * | 2022-03-07 | 2022-07-12 | 金川集团股份有限公司 | Method for removing heavy metals from ammonia-containing wastewater |
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