CN102774990A - Treatment method of heavy metal sewage - Google Patents

Treatment method of heavy metal sewage Download PDF

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Publication number
CN102774990A
CN102774990A CN2012102625126A CN201210262512A CN102774990A CN 102774990 A CN102774990 A CN 102774990A CN 2012102625126 A CN2012102625126 A CN 2012102625126A CN 201210262512 A CN201210262512 A CN 201210262512A CN 102774990 A CN102774990 A CN 102774990A
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CN
China
Prior art keywords
heavy metal
treatment
filtration
ferrous sulfate
effluent
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CN2012102625126A
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Chinese (zh)
Inventor
乔长文
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珠海市晴宇环保科技服务有限公司
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Priority to CN2012102625126A priority Critical patent/CN102774990A/en
Publication of CN102774990A publication Critical patent/CN102774990A/en

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Abstract

The invention discloses a treatment method of heavy metal sewage. The treatment method includes adding sodium sulfide and equivalent ferrous sulfate into alkaline precipitation effluent according to the proportion of 5-10mg/L, and performing filtration through a fiber ball low-speed filter, wherein the filtration velocity is less than 8m/h. According to the treatment method, the complexation interference resistance performance of heavy metal vulcanization precipitate is used, the sodium sulfide and the ferrous sulfate are sequentially added into the normal alkaline precipitation effluent, and then fiber ball low-speed filtration is directly performed to complete the treatment of the heavy metal sewage, the treating effect is good, the method can be applied to treatment of industrial wastewater in industries such as electroplating, circuit boards, heavy metal surface treatment, effluent sulfide and exceeding chemical oxygen demand (COD) cannot be caused, and effluent heavy metal is up to standards; and the occupied area is small, the original flow paths are not affected basically, and the method is particularly suitable for reconstruction projects of enterprises.

Description

The treatment process of heavy metal containing sewage
Technical field
The present invention relates to sewage treatment area, particularly a kind of treatment process of heavy metal containing sewage.
Background technology
At present, industries such as plating, wiring board, heavy metal surface treatment produce plurality of heavy metal sewage, and environment is caused very serious pollution.
The treatment process of general heavy metal containing sewage has alkaline sedimentation method or sulfurization-precipitation method.Heavy metal forms heavy metal complex easily, and sewage alkaline sedimentation method is having under the complex compound interferential situation, handles not goodly, and the water outlet heavy metal still exceeds standard, and can not reach discharging standards; There is not complex compound interferential problem in sulfurization-precipitation method, but the metallic sulfide sedimentation effect that forms in the sulfurization-precipitation method process is relatively poor, and common deposition and filter effect are undesirable, and the water outlet heavy metal still exceeds standard easily; In addition for reaching reaction efficiency, must the excessive sulfide that adds, cause that easily water outlet sulfide and COD (COD) exceed standard, and the water outlet color is darker.
At present, be to guarantee the processing efficiency of heavy metal wastewater thereby, method commonly used is to add the interference that heavy metal chelating agent is cut down complex compound, but fine heavy metals trapping device costs an arm and a leg, and a lot of enterprises all are difficult to bear.
Summary of the invention
Based on this, be necessary to provide a kind of to heavy metal good sewage processing effect and lower-cost heavy metal-polluted water treatment method.
A kind of heavy metal-polluted water treatment method, said heavy metal-polluted water treatment method may further comprise the steps:
(1) in the ratio of 5~10mg/L, in the alkaline sedimentation water outlet, adds sodium sulphite;
(2) drop into again with step (1) in the ferrous sulfate of sodium sulfate equivalent;
(3) fibrous nodules strainer filtration at a slow speed gets final product, and said filtration velocity is no more than 8m/h.
Among embodiment, filtration velocity is 6~8m/h described in the step (3) therein.
Therein among some embodiment, said fibrous nodules at a slow speed the thickness of filter bed of strainer greater than 2m.
Among some embodiment, the said fibrous nodules thickness of filter bed of strainer at a slow speed is 2m-4m therein.
Among embodiment, the add-on of sodium sulphite is 10mg/L described in the step (1) therein.
Among embodiment, the add-on of ferrous sulfate is 10mg/L described in the step (2) therein.
The treatment process of above-mentioned heavy metal containing sewage is utilized the anti-complexing jamming performance of heavy metal sulfide precipitation thing, in common alkaline precipitated outlet water, adds sodium sulphite and ferrous sulfate successively; Directly carrying out fibrous nodules then filters at a slow speed; Completion is to the processing of heavy metal containing sewage, and treatment effect is good, can be applicable to electroplate, the production wastewater treatment of industry such as wiring board, heavy metal surface treatment; Can not cause that water outlet sulfide and COD exceed standard, guarantee that the water outlet heavy metal is up to standard; The method of the invention floor space is little simultaneously, and original flow process is not had influence basically, is specially adapted to the improvement project of above-mentioned enterprise.
Description of drawings
Fig. 1 is the schema of the heavy metal-polluted water treatment method of the present invention.
Embodiment
Specify the present invention below in conjunction with accompanying drawing and specific embodiment.
Embodiment 1
As shown in Figure 1, board wastewater treatment process of the present invention may further comprise the steps: alkaline sedimentation 110, sulfide precipitation 120 and filter 130.
(1) adopt alkaline sedimentation 110 to impel the formation of the heavy metal ion except that complex compound deposition in the board wastewater; Upper strata sewage liquid is discharged, and has so just removed most of heavy metal ion, detects total copper in the sewage after alkaline sedimentation 110 is handled; In general; Total copper is no more than 2mg/L, and in this embodiment, total copper is 1.5mg/L.In this embodiment, alkaline sedimentation step 110 is a prior art, normally adds sheet alkali or lime the pH value of waste water is adjusted to more than the regulation point, and for example cupric ion requires the pH value more than 7.5, and the nickel ion general requirement makes copper form oxyhydroxide more than 9; Add Poly aluminum Chloride (PAC) and SEPIGEL 305 then the metallic hydrogen cupric oxide is condensed into sludge settling at the bottom of the pond, the copper concentration in the clear water reduces greatly, mainly is unprecipitated verditer particle and complex copper ion.This is the major cause of alkaline sedimentation method heavy metals exceeding standard.
(2) in the sulfide precipitation pond, carry out sulfide precipitation 120, add sodium sulphite and ferrous sulfate successively, since lower through the total metals of alkaline sedimentation 110 back liquid, generally be no more than 2mg/L, and therefore in this embodiment, the amount of the sodium sulphite of adding is 4mg/L.After sodium sulphite is handled, add an amount of ferrous sulfate again, remove excessive sodium sulphite, in this embodiment, the add-on of ferrous sulfate is 4mg/L.
(3) filter 130 steps then; In this embodiment, what take is to filter (run by gravity filtration) at a slow speed, and filtering velocity is about 8m/h; Far below the present recommendation filtering velocity of fiber ball filter 30-50m/h commonly used, so the absorption of strainer and cohesion are greater than interception function.
In this embodiment; Use fibrous nodules strainer is at a slow speed handled; Wherein this fibrous nodules at a slow speed strainer be to adopt commercially available diameter 25mm polyster fibre ball to do filtrate; Strainer filtering layer (being filler) total thickness surpasses 2m, the idiozome that the huge surface-area of fibrous nodules can active adsorption forms with the interception metallic sulfide, thus reach the effect of removing heavy metal in the water.The fiber-ball filter media acid-fast alkali-proof, not mould being stale-proof, and also proportion is little, can be through carbonated drink associating back flushing regeneration, and the system that guaranteed operation steady in a long-term.
Through after this art breading, the copper content of board wastewater water outlet drops to 0.05mg/L by 1.5mg/L; Sulfide is increased to 0.5mg/L; COD has increased 5mg/L.
Embodiment 2
As shown in Figure 1, electroplating effluent treatment method of the present invention may further comprise the steps: alkaline sedimentation 110, sulfide precipitation 120 and filter 130.
(1) adopt alkaline sedimentation 110 to impel the formation of the copper nickel ion except that complex compound deposition in the electroplating wastewater; Upper strata sewage liquid is discharged; So just, remove most of heavy metal ion, detected total copper in the sewage after alkaline sedimentation 110 is handled, in general; Total copper is no more than 2mg/L, and total nickel is no more than 2mg/L; In this embodiment, total copper is 1.6mg/L; Total nickel is 1.2mg/L.In this embodiment; Alkaline sedimentation step 110 is a prior art, normally adds sheet alkali or lime the pH value of waste water is adjusted to more than the regulation point, and for example cupric ion requires the pH value more than 7.5; The nickel ion general requirement is more than 9; The electroplating wastewater general requirement is adjusted to the pH value of waste water more than 9.0, makes copper form verditer, and nickel forms nickel hydroxide; Add Poly aluminum Chloride (PAC) and SEPIGEL 305 then metal hydroxides is condensed into sludge settling at the bottom of the pond, the copper concentration in the clear water reduces greatly, mainly is unprecipitated hydroxide particles and complex copper nickel ion.This is the major cause of alkaline sedimentation method heavy metals exceeding standard.
(2) in the sulfide precipitation pond, carry out sulfide precipitation 120, add sodium sulphite and ferrous sulfate successively, since lower through the total metals of alkaline sedimentation 110 back liquid, generally be no more than 2mg/L, and in this embodiment, the amount of the sodium sulphite of adding is 5mg/L.After sodium sulphite is handled, add an amount of ferrous sulfate again, remove excessive sodium sulphite, in this embodiment, the add-on of ferrous sulfate is 5mg/L
(3) filter 130 steps then; In this embodiment, what take is to filter (run by gravity filtration) at a slow speed, and filtering velocity is about 6m/h; Far below the present recommendation filtering velocity of fiber ball filter 30-50m/h commonly used, so the absorption of strainer and cohesion are greater than interception function.
In this embodiment; Use fibrous nodules strainer is at a slow speed handled; Wherein this fibrous nodules at a slow speed strainer be to adopt commercially available diameter 25mm polyster fibre ball to do filtrate; Strainer filtering layer (being filler) total thickness surpasses 3m, the idiozome that the huge surface-area of fibrous nodules can active adsorption forms with the interception metallic sulfide, thus reach the effect of removing heavy metal in the water.The fiber-ball filter media acid-fast alkali-proof, not mould being stale-proof, and also proportion is little, can be through carbonated drink associating back flushing regeneration, and the system that guaranteed operation steady in a long-term.
Through after this art breading, the copper content of board wastewater water outlet drops to 0.05mg/L by 1.6mg/L; Nickel content drops to 0.06mg/L by 1.2mg/L; Sulfide is increased to 0.5mg/L; COD has increased 8mg/L.
Embodiment 3
As shown in Figure 1, process for treating heavy-metal waste water of the present invention may further comprise the steps: alkaline sedimentation 110, sulfide precipitation 120 and filter 130.
(1) adopt alkaline sedimentation 110 to impel the formation of the copper nickel ion except that complex compound deposition in the electroplating wastewater; Upper strata sewage liquid is discharged; So just, remove most of heavy metal ion, detected total copper in the sewage after alkaline sedimentation 110 is handled, in general; Total copper is no more than 2mg/L, and total nickel is no more than 2mg/L; In this embodiment, total copper is 2mg/L; Total nickel is 1.5mg/L.In this embodiment; Alkaline sedimentation step 110 is a prior art, normally adds sheet alkali or lime the pH value of waste water is adjusted to more than the regulation point, and for example cupric ion requires the pH value more than 7.5; The nickel ion general requirement is more than 9; The electroplating wastewater general requirement is adjusted to the pH value of waste water more than 9.0, makes copper form verditer, and nickel forms nickel hydroxide; Add Poly aluminum Chloride (PAC) and SEPIGEL 305 then metal hydroxides is condensed into sludge settling at the bottom of the pond, the copper concentration in the clear water reduces greatly, mainly is unprecipitated hydroxide particles and complex copper nickel ion.This is the major cause of alkaline sedimentation method heavy metals exceeding standard.
(2) in the sulfide precipitation pond, carry out sulfide precipitation 120; Add sodium sulphite and ferrous sulfate successively; Because the total metals through alkaline sedimentation 110 back liquid is lower, generally is no more than 2mg/L, the content of the sodium sulphite that therefore adds in said sulfide precipitation 120 steps is no more than 5mg/L; In this embodiment, the amount of the sodium sulphite of adding is 10mg/L.After sodium sulphite is handled, add an amount of ferrous sulfate again, remove excessive sodium sulphite, in this embodiment, the add-on of ferrous sulfate is 10mg/L.
(3) filter 130 steps then; In this embodiment, what take is to filter (run by gravity filtration) at a slow speed, and filtering velocity is about 7m/h; Far below the present recommendation filtering velocity of fiber ball filter 30-50m/h commonly used, so the absorption of strainer and cohesion are greater than interception function.
In this embodiment; Use fibrous nodules strainer is at a slow speed handled; Wherein this fibrous nodules at a slow speed strainer be to adopt commercially available diameter 25mm polyster fibre ball to do filtrate; Strainer filtering layer (being filler) total thickness surpasses 2.8m, the idiozome that the huge surface-area of fibrous nodules can active adsorption forms with the interception metallic sulfide, thus reach the effect of removing heavy metal in the water.The fiber-ball filter media acid-fast alkali-proof, not mould being stale-proof, and also proportion is little, can be through carbonated drink associating back flushing regeneration, and the system that guaranteed operation steady in a long-term.
Through after this art breading, the copper content of board wastewater water outlet drops to 0.06mg/L by 2mg/L; Nickel content drops to 0.05mg/L by 1.5mg/L; Sulfide is increased to 0.7mg/L; COD has increased 10mg/L.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.

Claims (6)

1. a heavy metal-polluted water treatment method is characterized in that, may further comprise the steps:
(1) in the ratio of 5~10mg/L, in the alkaline sedimentation water outlet, adds sodium sulphite;
(2) drop into again with step (1) in the ferrous sulfate of sodium sulfate equivalent;
(3) fibrous nodules strainer filtration at a slow speed gets final product, and said filtration velocity is no more than 8m/h.
2. heavy metal-polluted water treatment method according to claim 1 is characterized in that, filtration velocity is 6~8m/h described in the step (3).
3. heavy metal-polluted water treatment method according to claim 1 and 2 is characterized in that, said fibrous nodules at a slow speed the thickness of filter bed of strainer greater than 2m.
4. heavy metal-polluted water treatment method according to claim 3 is characterized in that, the said fibrous nodules thickness of filter bed of strainer at a slow speed is 2~4m.
5. heavy metal-polluted water treatment method according to claim 1 is characterized in that, the add-on of sodium sulphite is 10mg/L described in the step (1).
6. heavy metal-polluted water treatment method according to claim 1 is characterized in that, the add-on of ferrous sulfate is 10mg/L described in the step (2).
CN2012102625126A 2012-07-26 2012-07-26 Treatment method of heavy metal sewage CN102774990A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103723859A (en) * 2013-12-23 2014-04-16 南京工程学院 Method for efficiently removing lead ions and cadmium ions in reverse-osmosis concentrated water
CN104261526A (en) * 2014-09-17 2015-01-07 哈尔滨工业大学深圳研究生院 Treatment method of heavy metal wastewater

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973652A (en) * 2010-09-29 2011-02-16 同济大学 Method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like
CN102311182A (en) * 2010-07-06 2012-01-11 上海瑞勇实业有限公司 Electroplating wastewater treatment method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102311182A (en) * 2010-07-06 2012-01-11 上海瑞勇实业有限公司 Electroplating wastewater treatment method
CN101973652A (en) * 2010-09-29 2011-02-16 同济大学 Method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张秋玲等: "重金属废水处理技术", 《环境保护与循环经济》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103723859A (en) * 2013-12-23 2014-04-16 南京工程学院 Method for efficiently removing lead ions and cadmium ions in reverse-osmosis concentrated water
CN104261526A (en) * 2014-09-17 2015-01-07 哈尔滨工业大学深圳研究生院 Treatment method of heavy metal wastewater

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