CN101525188A - Treatment method of chemo-setting and membrane separation of waste water containing Hg - Google Patents
Treatment method of chemo-setting and membrane separation of waste water containing Hg Download PDFInfo
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- CN101525188A CN101525188A CN200810127150A CN200810127150A CN101525188A CN 101525188 A CN101525188 A CN 101525188A CN 200810127150 A CN200810127150 A CN 200810127150A CN 200810127150 A CN200810127150 A CN 200810127150A CN 101525188 A CN101525188 A CN 101525188A
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Abstract
The invention discloses a treatment method of chemo-setting and membrane separation of waste water containing Hg, comprising the following steps: a. waste water containing Hg is lifted to a reactor; b. the waste water containing Hg reacts with the composite chemical agent added into the reactor and is transferred to be in a solid phase from a liquid phase; c. the waste water containing Hg automatically flows into an air oxidation reactor, and a reducing substance in the waste water is oxidized; d. the oxidized waste water enters a liquor storage tank and is lifted into a membrane separator by a lift pump for realizing solid-liquid separation, the exudation liquor is recycled, and the concentration liquor returns to the reactor; and e. part of the concentrated liquor is discharged to a dreg storage pool for recycling when the solid-containing content of the concentration liquor reaches a certain concentration, the overflow liquor returns to the reactor, and the composite chemical agent is supplemented into the reactor regularly. The invention has a water quality attaining the national discharging standard, effectively recycles the Hg and treats the waste water simultaneously, greatly reduces the treatment cost, can high-efficiently recycle refuses, thereby having favorable economic and social benefits, and has simple process, low operation cost and low energy consumption.
Description
Technical field:
A kind of wastewater treatment method of the present invention, particularly a kind of Hg wastewater treatment method that contains.
Background technology:
Along with developing rapidly of industry, prevent that the problem of trade effluent, waste residue is urgent day by day, wherein generally come into one's own in the world with the problem that contains Hg waste water especially.There are several processing to contain the Hg wastewater treatment method now, as sodium borohydride reduction method, copper scale substitution method, ion-exchange-resin process etc., but all there is complex treatment process, running cost, energy consumption height, solid is difficult to reclaim, and water quality can not be stablized and reaches discharging standards (concentration is less than 5ppb).
Summary of the invention:
Purpose of the present invention just is to overcome weak point of the prior art, provides a kind of treatment process simple, and running cost, energy consumption are low, and what water quality can reach discharging standards fully contains the Hg wastewater treatment method.
The object of the present invention is achieved like this: it may further comprise the steps:
A, the former Hg of containing waste water is promoted to reactor;
B, contain Hg waste water and in reactor, react, make Hg transfer to solid phase from liquid phase with the composite chemical medicament that adds;
C, then from flowing into air oxidation reaction device, the reducing substances in the oxidized waste water;
Waste water after d, the oxidation enters reservoir, enters membrane separation apparatus through lift pump, realizes solid-liquid separation, and transudate is recycled, and concentrated solution returns reactor;
E, partial concentration liquid drained into the storage slag bath after concentrated solution solid content concentration reaches 3～5 grams per liters and recycle, overflowing liquid returns reactor, regularly adds the composite chemical medicament in reactor.
Purpose of the present invention also can realize by following technical measures, the described composite chemical medicament of step b is not got rid of metal ion and complex compounds thereof such as calcium, magnesium, copper, iron, manganese, zinc, aluminium, chromium, tin, silver, the compound and the silicate compound of sulfide, sulphate cpd, halogeno salt compound, phosphorus comprise polyacrylamide series macromolecular compound.Containing Hg waste water is 30 minutes-3 hours minutes in the residence time of reactor, and the ratio of waste water and composite chemical medicament is 1000: 0.1～1, and the time that stops in step c is 5-60 minute, and vapour-liquid ratio is 40-15: 1.
Compared to existing technology, it is simple that the present invention has a treatment process, running cost, energy consumption are low, water quality can reach discharging standards fully, when handling waste water, but efficient recovery obtains the compound of Hg, and the present invention greatly reduces treatment cost, can efficiently refuse be recycled again simultaneously, have good economic benefits and social benefit.
Description of drawings: the present invention is made of 7 units.1: reactor, 2: air oxidation reaction device, 3: reservoir, 4: storage slag bath, 5: membrane separation apparatus, 6: lift pump, 7: efflux, 8: lift pump
Fig. 1 is a process flow sheet of the present invention
Embodiment:
Below by drawings and Examples in detail the present invention is described in detail:
Embodiment one, at first the waste water with the former Hg of containing is promoted to reactor 1, in reactor 1, add the vitriol reaction with the composite chemical medicament, make Hg transfer to solid phase from liquid phase, the residence time in reactor 1 is 10 minutes, and the ratio of waste water and composite chemical medicament vitriol is 1000: 0.2, then from flowing into air oxidation reaction device 2, reducing substances in the oxidized waste water, the tail gas emptying, the oxidation residence time also is 10 minutes, vapour-liquid ratio is 40: 1.Waste water after the oxidation enters a reservoir 3, enters membrane separation apparatus 5 through lift pump 8, realizes solid-liquid separation, and transudate effluxes to stablize by pipeline 7 and reaches discharging standards, Hg＜5ppb, and concentrated solution is controlled back reactor 1 by valve, and medicament is reused.
Embodiment two, the waste water of the former Hg of containing is promoted to reactor 1, in reactor 1 with composite chemical medicament iron halide reactant salt, make Hg transfer to solid phase from liquid phase, the residence time in reactor 1 is 120 minutes, and the ratio that waste water and composite chemical medicament add the halogenation molysite is 1000: 0.5, then from flowing into air oxidation reaction device 2, reducing substances in the oxidized waste water, the tail gas emptying, the oxidation residence time also is 20 minutes, vapour-liquid ratio is 30: 1.Enter a reservoir 3 at last, enter membrane separation apparatus 5 through lift pump 8, realize solid-liquid separation, transudate effluxes to stablize by pipeline 7 and reaches discharging standards, Hg＜5ppb, and concentrated solution is controlled back reactor 1 by valve, and medicament is reused.Also can to increase work efficiency, behind the finite concentration partial concentration liquid regularly be drained into storage slag bath 6 by pump 6 at membrane separation apparatus 5 internal recycle, overflowing liquid returns reactor 1, and solid is recycled, and regularly adds the composite chemical medicament in reactor 1.
Embodiment three, the waste water of the former Hg of containing is promoted to reactor 1, in reactor 1, react with composite chemical medicament polyacrylamide, make Hg transfer to solid phase from liquid phase, the residence time in reactor 1 is 50 minutes, and the ratio that waste water and composite chemical medicament add polyacrylamide is 1000: 1, then from flowing into air oxidation reaction device 2, reducing substances in the oxidized waste water, the tail gas emptying, the oxidation residence time also is 60 minutes, vapour-liquid ratio is 15: 1.Enter a reservoir 3 at last, enter membrane separation apparatus 5 through lift pump 8, realize solid-liquid separation, transudate effluxes to stablize by pipeline 7 and reaches discharging standards, Hg＜5ppb, and concentrated solution is controlled back reactor 1 by valve, and medicament is reused.Also can to increase work efficiency, behind the finite concentration partial concentration liquid regularly be drained into storage slag bath 6 by pump 6 at membrane separation apparatus 5 internal recycle, overflowing liquid returns reactor 1, and solid is recycled, and regularly adds the composite chemical medicament in reactor 1.
Claims (5)
1, the treatment process of chemosetting and membrane separation of waste water containing Hg is characterized in that may further comprise the steps:
A, the former Hg of containing waste water is promoted to reactor;
B, contain Hg waste water and in reactor, react, make Hg transfer to solid phase from liquid phase with the composite chemical medicament that adds;
C, then from flowing into air oxidation reaction device, the reducing substances in the oxidized waste water;
Waste water after d, the oxidation enters reservoir, enters membrane separation apparatus through lift pump, and membrane separation apparatus adopts internal recycle, and control interface flow velocity 0.5～4m/s prevents that film from stopping up, and realizes solid-liquid separation, and transudate is recycled, and concentrated solution returns reactor;
E, after concentrated solution solid content concentration reaches 3～5 grams per liters, partial concentration liquid is drained into the storage slag bath reclaims and to send mercury ore to recycle, overflowing liquid returns reactor, regularly adds the composite chemical medicament in reactor.
2, the Hg wastewater treatment method that contains according to claim 1, it is characterized in that: the described composite chemical medicament of step b is not got rid of metal ion and complex compounds thereof such as calcium, magnesium, copper, iron, manganese, zinc, aluminium, chromium, tin, silver, the compound and the silicate compound of sulfide, sulphate cpd, halogeno salt compound, phosphorus comprise polyacrylamide series macromolecular compound;
3, according to the described Hg wastewater treatment method that contains of claim 1, it is characterized in that: containing Hg waste water is 30 minutes-3 hours in the residence time of reactor, and the ratio of waste water and composite chemical medicament is 1000: 0.1～1;
4, according to the described Hg wastewater treatment method that contains of claim 1, it is characterized in that: the time that stops in step c is 5-60 minute, and vapour-liquid ratio is 40-15: 1;
5, according to the described Hg wastewater treatment method that contains of claim 1, it is characterized in that: membrane separation apparatus employing internal recycle flow velocity is 0.5～4m/s in steps d, prevents that film from blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810127150A CN101525188A (en) | 2008-06-20 | 2008-06-20 | Treatment method of chemo-setting and membrane separation of waste water containing Hg |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810127150A CN101525188A (en) | 2008-06-20 | 2008-06-20 | Treatment method of chemo-setting and membrane separation of waste water containing Hg |
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| CN101525188A true CN101525188A (en) | 2009-09-09 |
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| CN200810127150A Pending CN101525188A (en) | 2008-06-20 | 2008-06-20 | Treatment method of chemo-setting and membrane separation of waste water containing Hg |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698728A (en) * | 2015-07-13 | 2017-05-24 | 上海氯德新材料科技有限公司 | Method for treating mercury-containing wastewater |
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2008
- 2008-06-20 CN CN200810127150A patent/CN101525188A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698728A (en) * | 2015-07-13 | 2017-05-24 | 上海氯德新材料科技有限公司 | Method for treating mercury-containing wastewater |
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Open date: 20090909 |