CN109775884A - A kind of mercury-containing waste water treatment process - Google Patents
A kind of mercury-containing waste water treatment process Download PDFInfo
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- CN109775884A CN109775884A CN201711111740.2A CN201711111740A CN109775884A CN 109775884 A CN109775884 A CN 109775884A CN 201711111740 A CN201711111740 A CN 201711111740A CN 109775884 A CN109775884 A CN 109775884A
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Abstract
The present invention relates to technical field of waste water processing, more particularly to a kind of mercury-containing waste water treatment process, specifically by pre-processing, three process compositions of the removal of mercury and heavy metal chelating, mercury-containing waste water is adjusted to suitable pH value in pH conditioning tank by pretreatment, the removal of mercury includes converting mercuric sulphide for ionic mercury in a kettle and carrying out the liquid phase separation of mercuric sulphide, heavy metal chelating is that the clear liquid after liquid phase separation is carried out to multistage capture filter, guarantee that the mercury content in final outflow water is lower than 3 μ g/L, compared with the prior art, its mercury-containing waste water treatment process uses batch technique, continuous processing is become into batch processing, effect stability is reliable, removal of mercury reaction is carried out in a kettle, increase efficiency and mercuric sulphide that ionic mercury is converted into mercuric sulphide from the probability of liquid phase separation, supernatant carries out multistage capture filter, guarantee that the mercury in final outflow water contains It measures up to standard.
Description
Technical field:
The present invention relates to technical field of waste water processing more particularly to a kind of mercury-containing waste water treatment process.
Background technique:
Mercury is a kind of heavy metal element for having severe toxicity, is generated greatly once being lost to meeting in environment to the body of the mankind and animal
Harm, therefore, mercury pollution problem has been used as great attention of the new Global Environmental Problems by international community.The United Nations
United Nations Environment Programme (UNEP) is studying and defining the circulation of limitation mercury and is implementing the international convention that mercury is cut down, the Ministry of Industry and Information Technology, China also phase
Reinforce prevention and treatment to mercury pollution after having put into effect a series of laws and regulations.
Currently, mercury-containing waste water be mainly derived from chlorine industry, plastics industry, fur processing and pharmacy etc. " three wastes " discharge and
The use etc. of mercurous organic bactericide, for example, the catalyst used in production of vinyl chloride by calcium carbide method monomer production technology, usually with
Activated carbon is carrier, and the mercury chloride of dipping absorption certain mass score is prepared, due to the distillation of mercury chloride, cause mercury with
Synthesis gas enter it is subsequent washing, alkali cleaning purification system, form mercurous spent acid and mercury-containing waste water.
Existing mercury-containing waste water treatment method includes the precipitation method, absorption method, electrolysis method, phytoremediation and ion-exchange
Deng.The advantages of precipitation method: be widely used, cost performance it is high, disadvantage: water outlet mercury content is unstable between 5 ~ 20 μ g/L；Absorption method
Advantage: secondary pollution is small, disadvantage: power of regeneration is poor, operating cost is high；The advantages of electrolysis method: equipment is simple, strong operability, lacks
Point: energy consumption is high, operating cost is high；The advantages of phytoremediation: at low cost, disadvantage: period length, slow effect；Ion-exchange
Advantage: equipment operation is simple, and water outlet mercury content is lower than 5 μ g/L, and disadvantage: being easily clogged with impurities, wrap up, and is unable to long period and stablizes
Operation.
In conclusion the prior art is difficult to ensure the stabilization of mercury content in water outlet after handling mercury-containing waste water, it is unable to reach
Requirement in " caustic soda, PVC industry pollutant emission standard " (GB 15581-2016), so how to handle mercury-containing waste water
The mercury content in waste water to guarantee discharge is up to standard, becomes current urgent problem to be solved.
Summary of the invention:
It is an object of the invention to be directed to the existing state of the art, provide that a kind of simple process, mercury contains in effect stability and water outlet
Measure mercury-containing waste water treatment process up to standard.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of mercury-containing waste water treatment process, comprises the following steps:
(1) it pre-processes: mercury-containing waste water is imported into pH conditioning tank, adjusting pH value is 4 ~ 7；
(2) removal of mercury: the mercury-containing waste water after adjusting pH value is imported into reaction kettle in batches, blender is opened, is added into reaction kettle
Vulcanized sodium is stirred by 10min or more, and flocculant is added into reaction kettle, is stirred using 10min or more, and blender is stopped
And 60min or more is stood, bed mud under being formed in reaction kettle and in upper clear liquid；
(3) heavy metal chelating: the clear liquid in reaction kettle, which captures to pump by level-one, imports first level filtering device, in first level filtering device
Equipped with the first active carbon filter, coarse filtration is carried out to clear liquid and mercury adsorbs, oxidation is imported by the clear liquid after first level filtering device
Reaction tank carries out oxidation reaction, and the clear liquid through peroxidization is pumped by second capture and imports two-stage filter, second level mistake
It filters and is equipped with accurate filter in device, advanced treating and filtering are carried out to clear liquid.
Preferably, pH value described in process (1) is 5 ~ 6.
Further, reactor bottom described in process (2) is equipped with deslagging nozzle, and reaction kettle side wall is equipped with drain pipe
Mouthful.
Further, bed mud described in process (2) is discharged into plate and frame filter press by the deslagging nozzle, is taken off
The lower filter cake of water content is made in water process, and the waste water pressed out imports pH conditioning tank.
Further, it is connected with more medium filter before the first active carbon filter described in process (3), in clear liquid
Into before the first active carbon filter, particulate matter unprecipitated in clear liquid is intercepted.
Further, it is connected with manganese sand filter before accurate filter described in process (3), through peroxidization
Clear liquid enter before accurate filter, further aoxidize and intercept unprecipitated particulate matter in clear liquid.
Further, the second active carbon filter, further Adsorption of Mercury, and shape are connected with after the accurate filter
At final outflow water.
Further, level-one described in process (3) captures pump and second capture pump is all made of non-centrifugal water pump.
The invention has the benefit that
1, compared with the prior art, mercury-containing waste water treatment process pre-processes mercury-containing waste water in pH conditioning tank, and adjusting pH value is 4
~ 7, that is, it is adjusted to acidity, the conversion ratio that ionic mercury is converted into mercuric sulphide can be greatly increased, improves mercury removal rate；
2, using batch technique, continuous processing is become into batch processing, the mercurous useless of fixed volume is handled by reaction kettle every time
Water, effect stability are reliable；
3, the revolving speed control of vulcanized sodium cooperation blender increases the efficiency that ionic mercury is converted into mercuric sulphide, flocculant cooperation stirring
The revolving speed of machine controls, and improves probability of the mercuric sulphide from liquid phase separation, improves the efficiency of the technique removal of mercury；
4, reaction kettle stands 60min or more, and then clear liquid is discharged by drain nozzle, bed mud is discharged by deslagging nozzle,
It is tentatively separated by solid-liquid separation, creates more preferably condition for subsequent filter, reduce the burden and required precision of subsequent filter equipment；
5, bed mud is discharged into plate and frame filter press by deslagging nozzle, is carried out dehydrating, and the waste water pressed out imports pH conditioning tank,
Processing is re-started, keeps processing more thorough；
6, multistage capture filter is carried out by first level filtering device, two-stage filter, enhances and mercury chloride and mercuric sulphide is blocked
It cuts and adsorbs, improve the removal rate of mercury ion, guarantee that the mercury content in final outflow water is up to standard；
7, level-one captures pump and second capture pump is all made of non-centrifugal water pump, avoids the mercury slag to flocculate from being broken up, is conducive to
The interception of first level filtering device and two-stage filter to mercury slag；
8, it is equipped with oxidation reaction pond between first level filtering device and two-stage filter, carries out oxidation reaction, increases flocculating effect.
Detailed description of the invention:
Attached drawing 1 is process flow chart of the invention.
Mark explanation: 1, pH conditioning tank, 2, waste water pump, 3, reaction kettle, 4, level-one capture pump, 5, first level filtering device,
501, more medium filter, the 502, first active carbon filter, 6, oxidation reaction pond, 7, second capture pump, 8, secondary filtration dress
It sets, 801, manganese sand filter, 802, accurate filter, the 9, second active carbon filter, 10, plate and frame filter press.
Specific embodiment:
In order to enable juror to be further understood that the purpose, feature and function of the present invention, hereby preferred embodiment is lifted simultaneously
Cooperating schema, detailed description are as follows:
As shown in Figure 1, a kind of mercury-containing waste water treatment process, comprises the following steps:
(1) it pre-processes: mercury-containing waste water being imported into pH conditioning tank 1, spent acid or spent lye is added, adjusting pH value is 4 ~ 7, it is preferred that
Adjusting pH value is 5 ~ 6；
(2) removal of mercury: opening waste water pump 2, the mercury-containing waste water after adjusting pH value is imported reaction kettle 3 in batches, when liquid in reaction kettle 3
When position reaches the batch value of setting, waste water pump 2 is closed, blender is opened, blender revolving speed is adjusted to 30 ~ 50rpm, preferably
, revolving speed is adjusted to 41rpm, adds vulcanized sodium into reaction kettle 3, stirs by 10min, blender revolving speed is adjusted to 10 ~
20rpm, it is preferred that revolving speed is adjusted to 15rpm, adds flocculant into reaction kettle 3, stirs using 10min, stops blender
3 and 60min is stood, is separated by solid-liquid separation, bed mud under being formed in reaction kettle 3 and in upper clear liquid；
(3) heavy metal chelating: after the separation of solid and liquid for completing process (2), the drain nozzle on 3 side wall of reaction kettle is opened, opens one
Grade captures pump 4, and the clear liquid in reaction kettle 3 captures pump 4 by level-one and imports first level filtering device 5, is equipped in first level filtering device 5
First active carbon filter 502, carries out coarse filtration to clear liquid and mercury adsorbs, and imports oxidation by the clear liquid after first level filtering device 5
Reaction tank 6 after carrying out oxidation reaction in oxidation reaction pond 6, is then turned on second capture pump 7, will be through the clear of peroxidization
Liquid imports two-stage filters 8 by second capture pump 7, and accurate filter 802 is equipped in two-stage filter 8, to clear liquid into
Row advanced treating and filtering.
In process (1), the pH value of mercury-containing waste water is adjusted to 4 ~ 7, it is preferred that adjusting pH value is 5 ~ 6, that is, is adjusted to acid
Property, the conversion ratio that ionic mercury is converted into mercuric sulphide can be greatly increased, mercury removal rate is improved.
Removal of mercury processing example can be shown in Table 1:
Table 1
In process (2), 3 volume of reaction kettle is certain, facilitates the dosage of fixed added medicament, debugs and determine every kind of medicament
Dosage after, it is subsequent it is basic do not have to adjustment dosage,.
In process (2), 3 bottom of reaction kettle is equipped with deslagging nozzle, and 3 side wall of reaction kettle is equipped with drain nozzle, removes
Mercuration after reaction, first opens the drain nozzle on side wall, by clear liquid discharging to subsequent filter equipment, clear liquid discharging is finished
Afterwards, bed mud is discharged from the deslagging nozzle of bottom, and heavy metal is made full use of to settle principle, and preliminary solid-liquid point is carried out in reaction kettle 3
From for subsequent filter creation more preferably condition, the burden and required precision of reduction subsequent filter equipment.
In process (2), the bed mud is discharged into plate and frame filter press 10 by deslagging nozzle, or is discharged into centrifuge,
It is carried out dehydrating, the lower filter cake of water content is made, filter cake is transferred to the producer with mercurous Waste disposal qualification to recycle, extruded
The waste water come imports pH conditioning tank 1, re-starts processing, keeps processing more thorough, after the emptying of reaction kettle 3, closes all valves
Door waits next batch waste water to enter reaction kettle 3.
In process (3), be connected with more medium filter 501 before described first active carbon filter 502, clear liquid into
Before entering the first active carbon filter 502, particulate matter unprecipitated in clear liquid is intercepted.
In process (3), it is connected with manganese sand filter 801 before the accurate filter 802, through peroxidization
Clear liquid enters before accurate filter 802, further aoxidizes and intercepts unprecipitated particulate matter in clear liquid, main function is to protect
Protect subsequent accurate filter 802.
In process (3), the level-one captures pump 4 and second capture pump 7 is all made of non-centrifugal water pump, avoids under flocculation
The mercury slag come is broken up, the interception conducive to first level filtering device 5 and two-stage filter 8 to mercury slag.
It is connected with the second active carbon filter 9, further Adsorption of Mercury after the accurate filter 802, and is formed most
Water outlet eventually guarantees that the mercury content in final outflow water is lower than 3 μ g/L, reaches wastewater discharge standard.
Certainly, illustrated above is only better embodiment of the present invention, and use scope of the invention is not limited with this, therefore,
It is all made in the principle of the invention it is equivalent change should be included within the scope of the present invention.
Claims (8)
1. a kind of mercury-containing waste water treatment process, it is characterised in that comprise the following steps:
(1) it pre-processes: mercury-containing waste water is imported into pH conditioning tank, adjusting pH value is 4 ~ 7；
(2) removal of mercury: the mercury-containing waste water after adjusting pH value is imported into reaction kettle in batches, blender is opened, is added into reaction kettle
Vulcanized sodium is stirred by 10min or more, and flocculant is added into reaction kettle, is stirred using 10min or more, and blender is stopped
And 60min or more is stood, bed mud under being formed in reaction kettle and in upper clear liquid；
(3) heavy metal chelating: the clear liquid in reaction kettle, which captures to pump by level-one, imports first level filtering device, in first level filtering device
Equipped with the first active carbon filter, coarse filtration is carried out to clear liquid and mercury adsorbs, oxidation is imported by the clear liquid after first level filtering device
Reaction tank carries out oxidation reaction, and the clear liquid through peroxidization is pumped by second capture and imports two-stage filter, second level mistake
It filters and is equipped with accurate filter in device, advanced treating and filtering are carried out to clear liquid.
2. a kind of mercury-containing waste water treatment process according to claim 1, it is characterised in that: pH value described in process (1)
It is 5 ~ 6.
3. a kind of mercury-containing waste water treatment process according to claim 1, it is characterised in that: reaction described in process (2)
Bottom portion is equipped with deslagging nozzle, and reaction kettle side wall is equipped with drain nozzle.
4. a kind of mercury-containing waste water treatment process according to claim 3, it is characterised in that: bed mud described in process (2)
It is discharged into plate and frame filter press, is carried out dehydrating by the deslagging nozzle, the lower filter cake of water content is made, presses out
Waste water imports pH conditioning tank.
5. a kind of mercury-containing waste water treatment process according to claim 1, it is characterised in that: first described in process (3)
More medium filter is connected with before active carbon filter, before clear liquid enters the first active carbon filter, in clear liquid not
The particulate matter of precipitating is intercepted.
6. a kind of mercury-containing waste water treatment process according to claim 1, it is characterised in that: precision described in process (3)
It is connected with manganese sand filter before filter, before the clear liquid through peroxidization enters accurate filter, is further aoxidized
And intercept unprecipitated particulate matter in clear liquid.
7. a kind of mercury-containing waste water treatment process according to claim 6, it is characterised in that: after the accurate filter
It is connected with the second active carbon filter, further Adsorption of Mercury, and forms final outflow water.
8. a kind of mercury-containing waste water treatment process according to claim 1, it is characterised in that: level-one described in process (3)
It captures pump and second capture pump is all made of non-centrifugal water pump.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031207A (en) * | 2021-10-13 | 2022-02-11 | 宁夏金昱元高新材料有限公司 | Method for treating mercury-containing wastewater in PVC production |
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Application publication date: 20190521 |