CN207294424U - A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit - Google Patents
A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit Download PDFInfo
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- CN207294424U CN207294424U CN201721032808.3U CN201721032808U CN207294424U CN 207294424 U CN207294424 U CN 207294424U CN 201721032808 U CN201721032808 U CN 201721032808U CN 207294424 U CN207294424 U CN 207294424U
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Abstract
It the utility model is related to a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit.A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit, including settling tank, softening pond, flocculation basin and the clarifying basin being sequentially communicated；The settling tank bottom is connected to the first spoil disposal pipeline；Crystal seed is connected at the top of the softening pond and launches pipeline and the first medicament delivery pipeline, the softening bottom of pond portion is connected to the second spoil disposal pipeline；Second medicament is connected at the top of the flocculation basin and launches pipeline, the flocculation basin bottom is connected with the second spoil disposal pipeline；The clarifying basin bottom is connected with the second spoil disposal pipeline.The utility model can be by the Ca in desulfurization wastewater2+Selective Separation, is not influencing Mg2+Waste water is softened on the premise of concentration, reduces sediment growing amount, reduces the injected volume and cost of softening agent.
Description
Technical field
It the utility model is related to the device that a kind of desulfurization wastewater for high magnesium low calcium content carries out softening pretreatment, the dress
The dosage and cost for put and can reduce the growing amount of sediment in softening process, reducing softening agent, belong to environmental protection technology neck
Domain.
Background technology
In order to reach country to fired power generating unit SO2Increasingly stringent discharge limitation, most domestic thermal power plant are installed additional
Flue gas desulfurization device.Wherein, limestone-gypsum wet flue gas desulfurization technology is obtained since technical maturity is reliable, coal adaptability is strong
Widest application is arrived.The technology is in removing flue gas SO2While, it is severe and endanger pole also to generate complicated component, water quality
Big waste water (suspension content height, salt content superelevation, content of beary metal exceeded etc.).With State Council《Water pollution action plan》
Proposition, limitation of the country to discharge of wastewater will be more stringent, and heat-engine plant desulfurized wastewater zero discharge becomes Jiao paid close attention in the industry
Point.Because desulfurization waste water quality is extremely complex, various wastewater zero-discharge technology (such as flue evaporation, evaporative crystallization) is both needed to adopt at present
Making choice property of waste water is separated, concentrate and is purified with membrane filtration technique (such as reverse osmosis, nanofiltration) etc..Since desulfurization wastewater is past
It is very high toward hardness, easily result in blockage to fenestra, therefore need first to carry out softening pretreatment to waste water.
The desulfurization wastewater of high magnesium low calcium content is a kind of typical waste water quality, its Mg2+Concentration is up to ten thousand mg/L of 1-2, Ca2 +Concentration is about 500-1000mg/L.In conventional waste water softening preprocessing process, white lime-Method of Soda is commonly used to precipitate
Separate the Ca in solution2+And Mg2+.But for the desulfurization wastewater of high magnesium low calcium content, which has precipitation growing amount
Greatly, (softening agent and the precipitation capacity of generation that need to be added are up to waste water weight the problem of the consumption and excessive cost of softening agent
More than 10%, softening agent cost is up to 100-200 yuan/ton).Due to the Mg under sour environment2+Hardly fouling, and Ca2+Meeting
With the SO in waste water4 2-Form CaSO4The filter membrane in subsequent treatment process is blocked, therefore for the desulfurization wastewater of the type, selection
Separate Ca to property2+Softening efficiency can be not only improved, can more reduce reagent cost, realizes high efficiency, low cost softening pretreatment
It is crucial.
(step-by-step precipitation method removes the research water technologies of calcium and magnesium in RE waste water, 2016,42 (7) to Li Xin etc.：88-
92) experiment to RE waste water processing shows, oxalic acid is added into solution not to influence Mg2+Will be most of while concentration
Ca2+Precipitation separation.However, since the oxalic acid that the research uses is a kind of organic acid, it is extra in order to keep the certain pH of waste water to need
Ammonium hydroxide is added thereto to neutralize, if directly applying to desulfurization wastewater, can increase softening cost and process complexity, while can give
Waste water adds NH4 +, producing new pollutant need to further be handled；In addition, the RE waste water water quality that the research is directed to is given up with desulfurization
Water has very big difference, and (such as its suspension content is only below 4mg/L, and the suspension content of desulfurization wastewater is up to thousands of to several
Ten thousand mg/L；Its magnesium calcium ion concentration is than being only 5:1, and the desulfurization wastewater Mg of high magnesium low calcium content2+Concentration is up to Ca2+15-20
Times；Its solution is neutrality, and desulfurization wastewater is faintly acid), it is impossible to it is directly used in desulfurization wastewater softening.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of softening pretreatment of desulfurization wastewater for high magnesium low calcium content
Device, can be optionally by Ca2+Separated from waste water, effectively reduce precipitation growing amount, the consumption and cost of softening agent.
In order to achieve the above object, the concrete technical scheme of the utility model use is：
A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit, including settling tank, softening pond, the flocculation basin being sequentially communicated
And clarifying basin；
The settling tank is connected with desulfurizing tower, and the settling tank bottom is connected to the first spoil disposal pipeline；
Crystal seed is connected at the top of the softening pond and launches pipeline and the first medicament delivery pipeline, the softening bottom of pond portion is connected to the
Two spoil disposal pipelines；
Second medicament is connected at the top of the flocculation basin and launches pipeline, the flocculation basin bottom connects with the second spoil disposal pipeline
It is logical；
The clarifying basin bottom is connected with the second spoil disposal pipeline.
Further, the softening pond is internally provided with the first agitating device, and the flocculation basin is internally provided with the second stirring dress
Put.
Further, the settling tank, softening pond, flocculation basin and clarifying basin bottom are tapered.
Further, it is equipped with crystal seed reflux line between the second spoil disposal pipeline and softening pond top.
Further, the softening agent that the softening pond adds is sodium oxalate, is added by the first medicament delivery pipeline；It is described
The crystal seed that softening pond adds is calcium oxalate monohydrate, and launching pipeline by crystal seed adds.
The beneficial effects of the utility model are：
1. can be by the Ca in desulfurization wastewater2+Selective Separation, is not influencing Mg2+Waste water is carried out on the premise of concentration soft
Change, remain Ca2+Concentration is about Ca in raw water2The 10%-15% of concentration；
2. softening process can carry out under raw wastewater acid condition, it is not required to add neutralizing medicament to waste water；
3. reducing sediment growing amount, the injected volume and cost of softening agent are reduced；
4. using sodium oxalate as softening agent, waste water original pH will not be changed；
5. alleviate suspended matter and CaSO contained by waste water in subsequent film processing procedure4To the blockage problem of fenestra.
Brief description of the drawings
Fig. 1 is the structure diagram that high magnesium low calcium desulfurization wastewater described in the utility model softens pretreatment unit；
Wherein, 1- settling tanks, 2- softenings pond, 3- flocculation basins, 4- clarifying basins, the first agitating devices of 5-, the stirring dresses of 6- second
Put, 7- the first spoil disposal pipelines, 8- crystal seed reflux lines, 9- the second spoil disposal pipelines, 10- crystal seeds launch pipeline, and the first medicaments of 11- are thrown
Pipeline is put, 12- second medicaments launch pipeline.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining this
Utility model, is not used to limit the utility model.
As shown in Figure 1, there is provided a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit, including the settling tank being sequentially communicated
1st, pond 2, flocculation basin 3 and clarifying basin 4 are softened；
1 bottom of settling tank is connected to the first spoil disposal pipeline 7；
2 top of softening pond is connected to crystal seed and launches 10 and first medicament delivery pipeline 11 of pipeline, softening 2 bottom of pond
It is connected to the second spoil disposal pipeline 9；
The top of flocculation basin 3 is connected to second medicament and launches pipeline 12, flocculation basin (3) bottom and second spoil disposal
Pipeline 9 connects；
4 bottom of clarifying basin is connected with the second spoil disposal pipeline 9.
The softening pond 2 is internally provided with the first agitating device 5, and the flocculation basin 3 is internally provided with the second agitating device 6.
The settling tank 1, softening pond 2, flocculation basin 3 and 4 bottom of clarifying basin are tapered, its bottom tip connects the first spoil disposal
7 or second spoil disposal pipeline 9 of pipeline.
Be equipped with crystal seed reflux line 8 between the second spoil disposal pipeline 9 and softening pond 2 top, the crystal seed reflux line 8 and
Second spoil disposal pipeline 9 communicates, and the partly precipitated thing that softening pond 2 produces returns to soft through the second spoil disposal pipeline 9 and crystal seed reflux line 8
Change pond 2, as supplement crystal seed.
High magnesium low calcium desulfurization wastewater softening pretreatment is carried out based on above-mentioned high magnesium low calcium desulfurization wastewater softening pretreatment unit
Method, comprise the following steps：
Step 1, desulfurization wastewater enters settling tank 1, and the setting sedimentation time is 1-2h, obtains sedimentation waste water；In desulfurization wastewater
Suspended substance sedimentation to bottom of pond, discharged by the first spoil disposal pipeline 7, effluent can be used as gypsum by-product to comprehensively utilize；
Step 2, the sedimentation waste water on settling tank top enters softening pond 2, adds medicament A to softening pond 2, passes through the first stirring
Device 5 accelerates softening reaction speed, will settle the Ca in waste water2+Precipitation, the medicament A is sodium oxalate, and oxalic acid is added in step 2
After sodium, the molar concentration for controlling the sedimentation waste water mesoxalic acid sodium is Ca2+1-1.5 times of molar concentration.In order to improve precipitation point
From effect, while launch pipeline 10 through crystal seed and add crystal seed to softening pond 2, control crystal seed and sedimentation wastewater quality ratio be 2 ‰-
5 ‰, setting hydraulic detention time is 1-2h, and the crystal seed is calcium oxalate monohydrate.Sediment is discharged by the second spoil disposal pipeline 9, soft
Change and softening waste water is obtained inside pond 2.The partly precipitated thing that softening pond 2 produces is returned through the second spoil disposal pipeline 9 and crystal seed reflux line 8
To softening pond, as supplement crystal seed.
Step 3, the softening waste water enters flocculation basin 3, and adding combination medicament B, the combination medicament B to flocculation basin 3 is
Flocculant and flocculation aid.Accelerate the flocculation rate of suspended matter in softening waste water by the second agitating device 6, sediment is by second row
Mud pipeline 9 is discharged, and coagulation waste water is obtained inside flocculation basin 3.
Step 4, the coagulation waste water enters clarifying basin 4, and sediment is further by sedimentation separation, and through the second spoil disposal pipeline
9 discharge, and water outlet is obtained inside clarifying basin 4.
By taking the high magnesium low calcium content desulfurization wastewater softening of certain typical case as an example, its Mg2+And Ca2+Concentration be respectively 15000mg/L
And 800mg/L.According to the softening method of conventional white lime-soda ash, waste water per ton needs to add white lime in theory and soda ash is total to
About 120kg, only softening agent are of high cost up to 150 yuan/ton, and can additionally produce the sediment of 100kg or so needs to clear up, and seriously affects
Waste water treatment efficiency and economic benefit are arrived.According to device and method described in the utility model, waste water per ton in theory only
Sodium oxalate 3kg or so need to be added, softening agent cost is only 18 yuan/ton or so, and it is about 3kg to produce precipitation capacity, can be greatly enhanced
Waste water treatment efficiency and economic benefit.If being calculated with the desulfurization wastewater amount of 10-20t/h, compared with conventional white lime-soda ash this
Utility model can save ten thousand yuan of softening reagent cost 1000-2000, remarkable in economical benefits every year.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the present invention, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on, should be included within the scope of protection of this utility model.
Claims (5)
- A kind of 1. high magnesium low calcium desulfurization wastewater softening pretreatment unit, it is characterised in that including be sequentially communicated settling tank (1), Soften pond (2), flocculation basin (3) and clarifying basin (4)；Settling tank (1) bottom is connected to the first spoil disposal pipeline (7)；Crystal seed is connected at the top of softening pond (2) and launches pipeline (10) and the first medicament delivery pipeline (11), softening pond (2) Bottom is connected to the second spoil disposal pipeline (9)；Second medicament is connected at the top of the flocculation basin (3) and launches pipeline (12), flocculation basin (3) bottom and second spoil disposal Pipeline (9) connects；Clarifying basin (4) bottom is connected with the second spoil disposal pipeline (9).
- 2. a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit according to claim 1, it is characterised in that described soft Change pond (2) and be internally provided with the first agitating device (5), the flocculation basin (3) is internally provided with the second agitating device (6).
- 3. a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit according to claim 1, it is characterised in that described heavy It is tapered that pond (1), softening pond (2), flocculation basin (3) and clarifying basin (4) bottom drop.
- 4. a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit according to claim 1, it is characterised in that described the Crystal seed reflux line (8) is equipped between at the top of two spoil disposal pipelines (9) and softening pond (2).
- 5. a kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit according to claim 1, it is characterised in that described soft Change pond (2) using sodium oxalate as softening agent, added by the first medicament delivery pipeline (11)；Softening pond (2) uses one Water calcium oxalate is crystal seed, and launching pipeline (10) by crystal seed adds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311352A (en) * | 2017-08-17 | 2017-11-03 | 大唐环境产业集团股份有限公司 | A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311352A (en) * | 2017-08-17 | 2017-11-03 | 大唐环境产业集团股份有限公司 | A kind of high magnesium low calcium desulfurization wastewater softening pretreatment unit and method |
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