CN205556299U - Desulfurization waste water softens processing apparatus - Google Patents

Desulfurization waste water softens processing apparatus Download PDF

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Publication number
CN205556299U
CN205556299U CN201620116138.2U CN201620116138U CN205556299U CN 205556299 U CN205556299 U CN 205556299U CN 201620116138 U CN201620116138 U CN 201620116138U CN 205556299 U CN205556299 U CN 205556299U
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China
Prior art keywords
pond
deliming
waste water
desulfurization wastewater
demagging
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CN201620116138.2U
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Chinese (zh)
Inventor
刘海洋
夏怀祥
江澄宇
李叶红
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大唐环境产业集团股份有限公司
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Abstract

The utility model provides a desulfurization waste water softens processing apparatus, include: a removal of magnesium removes heavy pond, is equipped with 1 the 1st adding pipe, with removal of magnesium removes a just heavy pond of heavy pond intercommunication, and its bottom is equipped with 1 the 1st discharge mud pipe, with one of the pond intercommunication that just sinks removes calcium deposit pond group. Can make desulfurization waste water accord with membrane separation technique requirements such as RO through carry out the preliminary treatment to desulfurization waste water to can reduce operation and treatment cost by a wide margin.

Description

Desulfurization wastewater sofening treatment device

Technical field

The utility model relates to environmental protection technical field, is specifically related to a kind of desulfurization wastewater sofening treatment device.

Background technology

Coal fired power generation occupies critical role in China's energy resource supply.For environment protection, most of power plant of China in recent years Have employed Limestone-gypsum Wet Flue Gas Desulfurization Process technology, in order to remove the sulfur dioxide in flue gas.Use aforementioned desulfurization technology can produce greatly The desulfurization wastewater of amount, the wet desulphurization waste component of coal-burning power plant is complicated, containing high concentration suspended matter, oversaturated sulphite, Chlorion, sulfate and various heavy.

At present, desulfurization wastewater mainly uses chemical precipitation method to process, part index number difficulty up to standard, even if after process up to standard, due to Substantial amounts of sulfate and muriatic existence in waste water, water outlet salt content is still up to 2%~4%, is difficult to recycling, after outer row also Surface water and soil ecology can be caused to destroy, cause secondary pollution.Therefore, the research and development of desulfurization wastewater zero discharge treatment technology more come More come into one's own.

Evaporative crystallization method is desulfurization wastewater Zero-discharge treating process currently mainly, and evaporative crystallization method has, and energy consumption is high, equipment is easy The shortcoming that fouling is big with investment.And, it is the highest that evaporative crystallization method processes desulfurization wastewater cost, and ton water processing cost generally to reach More than 60 yuan;In order to reduce processing cost, in some practice of construction, the membrane separation techniques such as RO (counter-infiltration) can be used first Waste water carries out minimizing process, and the dense water that UF membrane produces is evaporated crystallization again, so can effectively reduce evaporative crystallization Process load and save processing cost.But when using the membrane separation technique such as RO, need in advance desulfurization wastewater to be carried out strict pre- Processing, owing in waste water, calcium and magnesium concentration is high, calcium sulfate is in hypersaturated state, and softening pretreatment cost can be caused high.Have Time, the most only ton water softens cost the most up to more than 30 yuan, is still unable to reach the purpose effectively controlling cost.

Chinese utility model patent (CN204752423U) and application for a patent for invention (CN104843927A) all disclose employing Sodium sulphate combines flue gas tenderizer process and processes desulfurization wastewater, but uses flue gas to provide carbonate to carry out deliming and have the disadvantage in that Aeration process controls difficulty, and once flue gas excess, can cause the pH value of desulfurization wastewater to reduce, and then cause calcium carbonate again to dissolve; Further, the flue gas in flue is high-temperature gas, can be heated waste water by heat exchange, causes waste water to lose, meanwhile, and two Technique disclosed in piece patent document do not has removal of mercury measure, it is easy to cause the escape of mercury, so, in addition it is also necessary to extra to cigarette Gas carries out purified treatment, increases extra processing equipment, in a disguised form adds the complexity of desulphurization system, improves operation and dimension Protect cost.

Therefore, in order to avoid environmental pollution and recycle-water resource, in view of the shortcoming and defect that desulfurization wastewater sofening treatment cost is high, Exploiting economy efficient desulfurization wastewater sofening treatment technology for Wet Flue Gas Desulfurization Technique field, it is critical that.

Utility model content

For the problems referred to above, the purpose of this utility model is to provide a kind of desulfurization wastewater sofening treatment device.Can be by desulfurization Waste water pre-processes, and makes desulfurization wastewater meet the membrane separation technique requirements such as RO, and operation can be greatly lowered and be processed into This.

For reaching above-mentioned purpose, the concrete technical scheme that the utility model is taked is:

A kind of desulfurization wastewater sofening treatment device, including:

One demagging, except weight pond, is provided with one first dosing pipe;

The preliminary sedimentation tank connected except weight pond with described demagging, is provided with one first spoil disposal pipeline bottom it;

The deliming sedimentation basin group connected with described preliminary sedimentation tank.

Further, described deliming sedimentation basin group includes the first deliming pond being sequentially communicated, one or two deliming ponds and a second pond; Described first deliming pond is provided with one second dosing pipe;Described secondary deliming pond is provided with one the 3rd dosing pipe;At the bottom of described second pond Portion is provided with one second spoil disposal pipeline and connects with an outlet pipeline;Described outlet pipeline connection one neutralization dosing pipe.

Further, described demagging removes weight pond, first deliming pond and secondary deliming pond and is equipped with liquid mixing device.

Further, described liquid loads in mixture and is set to an agitating device or an aerator.

Further, the bottom of described preliminary sedimentation tank and second pond is bucket-shaped, described bucket-shaped most advanced and sophisticated connection the first spoil disposal pipeline or Second spoil disposal pipeline.

The method carrying out desulfurization wastewater sofening treatment based on aforementioned means, comprises the following steps:

1) desulfurization wastewater enters demagging and removes weight pond, and to demagging except adding calcium hydroxide and organic sulfur in weight pond, in controlling pond, pH is 9~12, obtain demagging except weight waste water;

2) demagging enters preliminary sedimentation tank except weight waste water, carries out mud-water separation, obtains primary sludge and low concentration wastewater;

3) low concentration wastewater enters deliming sedimentation basin group, carries out deliming, precipitation and neutralisation treatment, obtains water outlet and secondary sludge.

Further, step 1) also include to demagging except weight pond adds flocculant and/or flocculation aid.

Further, landfill stabilization after described primary sludge carries out thickening process;Described secondary sludge passes through a gypsum dehydration Machine carries out processed, comprehensively utilizes as gypsum by-product.

Further, step 3) in low concentration wastewater enter deliming sedimentation basin group, carry out deliming, precipitation and neutralisation treatment include:

3-1) low concentration wastewater enters first deliming pond, sulfate in first deliming pond, makes calcium ion concentration in low concentration wastewater It is reduced to 300~800mg/L, obtains first deliming waste water;

3-2) first deliming waste water enters secondary deliming pond, adds carbonate, flocculant and flocculation aid to secondary deliming pond, makes to give up In water, remaining calcium ion generates precipitation of calcium carbonate, obtains secondary deliming waste water;

3-3) secondary deliming waste water enters second pond, carries out precipitation clarification, makes calcium ion concentration in secondary deliming waste water be reduced to Below 10mg/L, obtains secondary sludge and water outlet;

3-4) in water outlet, add hydrochloric acid, the pH value of water outlet is regulated to 6~8.

By taking technique scheme, due to sulfate, the medicament such as such as sodium sulphate is cheap, soft realizing desulfurization wastewater While changing purpose, advantageously reduce desulfurization wastewater sofening treatment cost, heavy metal row up to standard in desulfurization wastewater can be realized simultaneously Put, it is to avoid the heavy metal in waste water causes environmental pollution.Additionally, the mud that demagging produces except weight process contains various heavy, May be hazardous waste, and deliming process produces mud and is mainly calcium sulfate and calcium carbonate, for general solid waste, can be as gypsum Byproduct, therefore primary sludge and secondary sludge to producing carry out different disposal, can effectively reduce sludge treatment amount.To sum up, Desulfurization wastewater sofening treatment device and method of the present utility model has that operating cost is low, bating effect good, mud generation amount less and It is prone to the advantage combined with other technique.

Accompanying drawing explanation

Fig. 1 is the layout schematic diagram of the desulfurization wastewater sofening treatment device in the utility model one embodiment.

Detailed description of the invention

For making features described above of the present utility model and advantage to become apparent, special embodiment below, and coordinate institute's accompanying drawing to make in detail Carefully it is described as follows.

As it is shown in figure 1, in one embodiment, it is provided that a kind of desulfurization wastewater sofening treatment device, including:

Demagging removes weight pond 1, is provided with the first dosing pipe;The preliminary sedimentation tank 3 connected except weight pond 1 with demagging, is provided with first row bottom it Mud pipeline 4;The deliming sedimentation basin group connected with preliminary sedimentation tank 3.

Deliming sedimentation basin group includes first deliming pond 5, secondary deliming pond 7 and the second pond 9 being sequentially communicated;First deliming pond 7 sets There is one second dosing pipe;Secondary deliming pond 7 is provided with one the 3rd dosing pipe;The second spoil disposal pipeline 10 it is provided with bottom second pond 9 And connect with outlet pipeline;This outlet pipeline connection one neutralization dosing pipe.

From the figure, it can be seen that demagging is equipped with liquid mixing device except weight pond 1, first deliming pond 5 and secondary deliming pond 7, i.e. the One agitating device the 2, second agitating device 6 and the 3rd agitating device 8.Agitating device is only a kind of way of realization of liquid mixing device, In other embodiments, it would however also be possible to employ aerator is as liquid mixing device.

It addition, the bottom of preliminary sedimentation tank 3 and second pond 9 is bucket-shaped, bucket-shaped most advanced and sophisticated connection the first spoil disposal pipeline 4 or second row Mud pipeline 10.Be conducive to concentration alluvial and the discharge of mud.

When desulfurization wastewater is carried out sofening treatment, first, desulfurization wastewater enters demagging and removes weight pond 1, to demagging except throwing in weight pond Adding combination medicament A, including calcium hydroxide and organic sulfur, in control pond, pH is 9~12, makes the magnesium in desulfurization wastewater and major part Heavy metal generates hydroxide precipitation, and mercury in desulfurization wastewater generates sulfide precipitation, thus remove in desulfurization wastewater magnesium hardness and The heavy metals such as lead, zinc, chromium and mercury;Obtain demagging except weight waste water.

Then, demagging enters preliminary sedimentation tank 3 except weight waste water, carries out mud-water separation, and in preliminary sedimentation tank water outlet, magnesium density is reduced to 15mg/L Hereinafter, obtaining primary sludge and low concentration wastewater, primary sludge carries out landfill stabilization after thickening process, and heavy metal realizes reaching Mark discharge;

Subsequently, low concentration wastewater, i.e. preliminary sedimentation tank supernatant enter deliming sedimentation basin group, carry out deliming, precipitate and neutralisation treatment, Obtain water outlet and secondary sludge.

For strengthening subsequent mud-water separation effect, can be to demagging except weight pond 1 adds flocculant and/or flocculation aid.

Secondary sludge carries out processed by a gypsum dehydration machine, comprehensively utilizes as gypsum by-product.

Deliming, precipitates and neutralisation treatment specifically includes:

1) low concentration wastewater enters first deliming pond, and adding medicament B, medicament B in deliming pond is sulfate, preferably sulfuric acid Sodium, by increasing sulfate concentration in low concentration wastewater, makes oversaturated calcium sulfate in low concentration wastewater separate out, thus reaches Except the purpose of part calcium ion, in low concentration wastewater, sodium sulphate dosage is 0.01~0.3mol/L, makes calcium in low concentration wastewater Ion concentration is reduced to 300~800mg/L;Obtain first deliming waste water;

2) first deliming waste water enters secondary deliming pond, add to secondary deliming pond combination medicament C include carbonate, flocculant and Flocculation aid, makes in waste water remaining calcium ion generate precipitation of calcium carbonate, simultaneously according to precipitation status determine whether to add flocculant and Flocculation aid is to improve sludge settling performance further;Obtain secondary deliming waste water;Carbonate is preferably sodium carbonate;

3) secondary deliming waste water enters second pond, carries out precipitation clarification, makes calcium ion concentration in secondary deliming waste water be reduced to 10 Below mg/L, obtains secondary sludge and water outlet;

4) adding medicament D in water outlet, medicament D is acid medicine, preferably hydrochloric acid, regulates the pH value of water outlet to 6~8, In case being further processed (being such as directly evaporated crystallization again after evaporative crystallization or mould concentration) or qualified discharge.

As a example by a Practical Project, take certain power plant desulfurization waste water, initially enter demagging and remove weight pond, open agitating device, to reaction Adding calcium hydroxide and organic sulfur in pond, in control reactor, pH is about 11.5, makes the magnesium in waste water and major part heavy metal Generation hydroxide precipitates, and the mercury in waste water generates sulfide precipitation, and then waste water enters preliminary sedimentation tank, at the beginning of after mud-water separation In sinking pool effluent, magnesium density is reduced to below 15mg/L, and heavy metal realizes qualified discharge, and preliminary sedimentation tank produces mud with demagging except weight The further thickening of mud that pond produces processes, and final security landfill is disposed.

Preliminary sedimentation tank supernatant enters first deliming pond, adds sodium sulphate in deliming pond, and dosage is 0.1mol/L, by increasing Add sulfate radical in waste water concentration, make oversaturated calcium sulfate in waste water separate out, thus reach to remove the purpose of part calcium ion, useless In water, the dosage of sodium sulphate is 0.01~0.3mol/L, makes calcium ion concentration in waste water be reduced to about 500 by 2500mg/L mg/L.Then waste water enters secondary deliming pond, adds sodium carbonate, flocculant and flocculation aid, make in waste water remaining in waste water Calcium ion generates precipitation of calcium carbonate, is simultaneously introduced flocculant and flocculation aid improves sludge settling performance, and waste water enters second pond, warp After crossing precipitation clarification, making calcium ion concentration in waste water be reduced to below 10mg/L, second pond, deliming pond, secondary deliming pond are produced Raw mud is discharged into gypsum dehydration machine and carries out processed, comprehensively utilizes as gypsum by-product.

Wastewater pH, by adding hydrochloric acid, is pulled back to 6~8 by the supernatant of second pond, can meet evaporative crystallization or film concentrates water The requirement of matter, can select qualified discharge according to actual condition or be further processed.

During whole sofening treatment, through adjusting, ton water softens cost and is about 15 yuan;Mud is by splitting process, and it is processed into Originally more conventional desulfurization wastewater sofening treatment technique 50% can be reduced.

It should be noted that the utility model, for preferable case study on implementation of the present utility model, is not imposed any restrictions by the above, Every any simple modification, change and equivalent structure change above example made according to the utility model technical spirit, All still fall within the protection domain of technical solutions of the utility model.

Claims (5)

1. a desulfurization wastewater sofening treatment device, it is characterised in that including:
One demagging, except weight pond, is provided with one first dosing pipe;
The preliminary sedimentation tank connected except weight pond with described demagging, is provided with one first spoil disposal pipeline bottom it;
The deliming sedimentation basin group connected with described preliminary sedimentation tank.
2. desulfurization wastewater sofening treatment device as claimed in claim 1, it is characterised in that described deliming sedimentation basin group includes the first deliming pond being sequentially communicated, one or two deliming ponds and a second pond;Described first deliming pond is provided with one second dosing pipe;Described secondary deliming pond is provided with one the 3rd dosing pipe;It is provided with one second spoil disposal pipeline bottom described second pond and connects with an outlet pipeline;Described outlet pipeline connection one neutralization dosing pipe.
3. desulfurization wastewater sofening treatment device as claimed in claim 2, it is characterised in that described demagging is equipped with liquid mixing device except weight pond, first deliming pond and secondary deliming pond.
4. desulfurization wastewater sofening treatment device as claimed in claim 3, it is characterised in that described liquid loads in mixture and is set to an agitating device or an aerator.
5. desulfurization wastewater sofening treatment device as claimed in claim 2, it is characterised in that the bottom of described preliminary sedimentation tank and second pond is bucket-shaped, described bucket-shaped most advanced and sophisticated connection the first spoil disposal pipeline or the second spoil disposal pipeline.
CN201620116138.2U 2016-02-05 2016-02-05 Desulfurization waste water softens processing apparatus CN205556299U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621742A (en) * 2016-02-05 2016-06-01 大唐环境产业集团股份有限公司 Desulfurization waste water softening device and desulfurization waste water softening method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621742A (en) * 2016-02-05 2016-06-01 大唐环境产业集团股份有限公司 Desulfurization waste water softening device and desulfurization waste water softening method
CN105621742B (en) * 2016-02-05 2019-01-25 大唐环境产业集团股份有限公司 Desulfurization wastewater sofening treatment device and method

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