CN110156181A - A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process - Google Patents
A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process Download PDFInfo
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- CN110156181A CN110156181A CN201810256841.7A CN201810256841A CN110156181A CN 110156181 A CN110156181 A CN 110156181A CN 201810256841 A CN201810256841 A CN 201810256841A CN 110156181 A CN110156181 A CN 110156181A
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- Prior art keywords
- sludge
- reaction pond
- order reaction
- desulfurization wastewater
- treatment process
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process, the equipment used includes first order reaction pond, second order reaction pond, first medicine system, second medicine system, blender, sludge delivery pump, sludge reflux pump and sludge treating system, the first order reaction pond is connected to upper end with the first medicine system, first order reaction pond lower end is connected to sludge delivery pump, second order reaction pond upper end is connected to the second medicine system, second order reaction pond lower end is connected to sludge reflux pump, the outlet of the sludge reflux pump is equipped with mud return line, one end of the mud return line is connect with sludge treating system.The present invention can efficiently remove the calcium and magnesium hardness in desulfurization wastewater, while effective using the sludge generated, save raw material, increase economic efficiency.
Description
Technical field
The present invention relates to desulfurization wastewater processing technology field more particularly to a kind of desulfurization wastewater secondary softening scale removal and sludge
Reuse treatment process.
Background technique
China is that maximum coal production and country of consumption, ratio of the coal in energy structure in China are up in the world
76.2%, the sulfur dioxide 90% of China's discharge is both from fire coal.In recent years, although China took Regulation Policy on Pollution Discharge Fee, but
Still above 20,000,000 tons, Acid Rain Pollution area expands rapidly annual SO2 emissions, to China crops, forest, soil
Earth and human health etc. cause huge damage, also become an important factor for restricting China's economy, social sustainable development, because
This, it is imperative to the control of sulfur dioxide (SO2) emissions.Flue gas desulfurization is unique large-scale commercial application in the world at present
Desulfurization method is the technical way for controlling sulfur dioxide pollution.Boiler smoke wet desulphurization (limestone/gypsum method) process
The wastewater source of generation discharges water in absorption tower.In order to maintain the balance of desulfurizer serum recycle system substance, flue gas is prevented
Middle soluble fraction, that is, cl concn is more than specified value and guarantee gypsum quality, it is necessary to a certain amount of waste water, waste water are discharged from system
Mainly from gypsum dehydration and cleaning system.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process, can efficiently remove desulfurization
Calcium and magnesium hardness in waste water, at the same it is effective using the sludge generated, raw material is saved, is increased economic efficiency.
A kind of desulfurization wastewater secondary softening scale removal according to an embodiment of the present invention and sludge reuse treatment process, what is used sets
Standby includes first order reaction pond, second order reaction pond, the first medicine system, the second medicine system, blender, sludge delivery pump, sludge
Reflux pump and sludge treating system, the first order reaction pond are connected to upper end with the first medicine system, under the first order reaction pond
End be connected to sludge delivery pump, second order reaction pond upper end is connected to the second medicine system, second order reaction pond lower end and
Sludge reflux pump connection, method and step are as follows:
S1: the desulfurization wastewater produced in flue gas wet desulphurization process enters first order reaction pond by collection conduit, medicament NaOH,
Na2S, flocculant and flocculation aid are added by the first medicine system into first order reaction pond, the stirring of agitated machine, medicament and useless
Water is sufficiently mixed, reacts, and waste water is delivered to second order reaction pond from water pipe after sedimentation, and the precipitating of bottom is in form of a sludge by sludge
Delivery pump is delivered to sludge treating system processing, handles dewatered sludge outward transport landfill disposal；
S2: medicament Na is added to the waste water entered in second order reaction pond by the second medicine system2CO3, flocculant and flocculation aid,
Agitated machine is sufficiently stirred, and medicament and waste water are sufficiently mixed, react, and the waste water after sedimentation enters from the water outlet in second order reaction pond
Subsequent processing unit, the precipitating of bottom are delivered to flue gas wet desulphurization process section by sludge reflux pump in form of a sludge.
Preferably, first reaction tank and the second reaction tank include the first dosing chamber, the second dosing chamber and sedimentation chamber.
Preferably, first medicine system is added with the first dosing chamber in first order reaction pond and second respectively by chemical feed pipe
Medicine cavity connection, the sedimentation chamber bottom in the first order reaction pond is connect with sludge delivery pump.
Preferably, second medicine system is added with the first dosing chamber in second order reaction pond and second respectively by chemical feed pipe
Medicine cavity connection, the sedimentation chamber bottom in the second order reaction pond is connect with sludge reflux pump.
Preferably, the first dosing chamber and the second dosing is intracavitary is equipped with blender, the sedimentation chamber water outlet is equipped with
Strainer.
Preferably, the outlet of the sludge reflux pump is equipped with mud return line, one end of the mud return line and sludge
Processing system connection.
Preferably, the flocculant be one of aluminium polychloride, polyaluminium sulfate, poly-ferric chloride and polysilicon acid or
It is several.
Preferably, the flocculation aid is activated silicic acid, polyacrylamide and one of gelatine and sodium alginate or several
Kind.
Compared with prior art, the beneficial effects of the present invention are: desulfurization wastewater secondary softening scale removal of the invention and sludge
Reuse treatment process method is eliminated the calcium ions and magnesium ions and heavy metal ion in dehydration waste water, is reduced by secondary softening scale removal
The hardness of desulfurization wastewater reduces the load of wastewater treatment, improves waster water process operational efficiency；In secondary softening stain eliminating technology
The precipitation of calcium carbonate of generation exists in the form of the lime stone slurry of high-purity, is back to smoke-gas wet desulfurization (lime stone-stone
Cream method) process section is not required to dissolve slurrying again as smoke-gas wet desulfurization (limestone-gypsum method) raw material, reduce wet flue gas
The operating cost of desulfurization, it is easy to operate, generate considerable economic benefit.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of a kind of desulfurization wastewater secondary softening scale removal proposed by the present invention and sludge reuse treatment process.
In figure: 1- first order reaction pond, 2- second order reaction pond, the first medicine system of 3-, the second medicine system of 4-, 5- stirring
Machine, 6- sludge delivery pump, 7- sludge reflux pump, 8- valve, 9- mud return line, 10- sludge treating system, the first dosing of 11-
Chamber, the second dosing of 12- chamber, 13- sedimentation chamber；
A- desulfurization wastewater, B- soften the desulfurization wastewater after scale removal, the sludge of C- to flue gas wet desulphurization process, and the outward transport of D- sludge is filled out
It buries.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Examples of the embodiments are shown in the accompanying drawings, and in which the same or similar labels are throughly indicated identical or classes
As element or element with the same or similar functions.The embodiments described below with reference to the accompanying drawings are exemplary, purport
It is being used to explain the present invention, and is being not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Referring to Fig.1, a kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process, the equipment used include level-one
Reaction tank 1, second order reaction pond 2, the first medicine system 3, the second medicine system 4, blender 5, sludge delivery pump 6, sludge reflux
Pump 7 and sludge treating system 10, the first order reaction pond 1 are connected to upper end with the first medicine system 3, the first order reaction pond 1
Lower end is connected to sludge delivery pump 6, and 2 upper end of second order reaction pond is connected to the second medicine system 4, the second order reaction pond 2
Lower end is connected to sludge reflux pump 7, and method and step is as follows:
S1: the desulfurization wastewater produced in flue gas wet desulphurization process enters first order reaction pond 1 by collection conduit, medicament NaOH,
Na2S, flocculant and flocculation aid are added by the first medicine system 3 into first order reaction pond 1, the stirring of agitated machine 5, medicament
It is sufficiently mixed, reacts with waste water, the magnesium ion, mercury ion, copper ion and other heavy metal ion in waste water form hydroxide
And sulfide precipitation, waste water is delivered to second order reaction pond 2 from water pipe after sedimentation, and the precipitating of bottom is defeated by sludge in form of a sludge
It send pump 6 to be delivered to the processing of sludge treating system 10, handles dewatered sludge outward transport landfill disposal；
S2: medicament Na is added to the waste water entered in second order reaction pond 2 by the second medicine system 42CO3, flocculant and help solidifying
Agent, agitated machine 5 are sufficiently stirred, and medicament and waste water are sufficiently mixed, react, water outlet of the waste water after sedimentation from second order reaction pond 2
Mouth enters subsequent processing unit, and the precipitating of bottom is delivered to smoke-gas wet desulfurization work by sludge reflux pump 7 in form of a sludge
Skill section.
The precipitation of calcium carbonate sludge that second order reaction pond 2 is formed exists in the form of lime stone slurry, due to first order reaction
Pond 1 eliminates the heavy metal ion and magnesium ion of the overwhelming majority, and lime stone slurry purity is high can be used as smoke-gas wet desulfurization (stone
Lime stone-gypsum) raw material continues to use, and 2 sludge of second order reaction pond is pumped by sludge reflux pump 7 to smoke-gas wet desulfurization (lime stone-
Gypsum) process section, by control valve 8, extra sludge can be delivered at sludge treating system 10 by sludge reflux pump 7
Reason.
First reaction tank 1 and the second reaction tank 2 include the first dosing chamber 11, the second dosing chamber 12 and sedimentation chamber
13；First medicine system 3 is connected with the first dosing chamber 11 in first order reaction pond 1 and the second dosing chamber 12 respectively by chemical feed pipe
Logical, 13 bottom of sedimentation chamber in the first order reaction pond 1 is connect with sludge delivery pump 6；Second medicine system 4 passes through chemical feed pipe
It is connected to respectively with the first dosing chamber 11 in second order reaction pond 2 and the second dosing chamber 12,13 bottom of sedimentation chamber in the second order reaction pond 2
Portion is connect with sludge reflux pump 7；Blender 5, the sedimentation chamber are equipped in the first dosing chamber 11 and the second dosing chamber 12
13 water outlets are equipped with strainer；The outlet of the sludge reflux pump 7 be equipped with mud return line 9, one end of the mud return line 9 with
Sludge treating system 10 connects；The flocculant is one in aluminium polychloride, polyaluminium sulfate, poly-ferric chloride and polysilicon acid
Kind is several；The flocculation aid is activated silicic acid, polyacrylamide and one or more of gelatine and sodium alginate.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process, the equipment used includes first order reaction pond, two
Order reaction pond, the first medicine system, the second medicine system, blender, sludge delivery pump, sludge reflux pump and Treatment of Sludge system
System, the first order reaction pond are connected to upper end with the first medicine system, and first order reaction pond lower end is connected to sludge delivery pump,
Second order reaction pond upper end is connected to the second medicine system, and second order reaction pond lower end is connected to sludge reflux pump, special
Sign is that method and step is as follows:
S1: the desulfurization wastewater produced in flue gas wet desulphurization process enters first order reaction pond by collection conduit, medicament NaOH,
Na2S, flocculant and flocculation aid are added by the first medicine system into first order reaction pond, the stirring of agitated machine, medicament and useless
Water is sufficiently mixed, reacts, and waste water is delivered to second order reaction pond from water pipe after sedimentation, and the precipitating of bottom is in form of a sludge by sludge
Delivery pump is delivered to sludge treating system processing, handles dewatered sludge outward transport landfill disposal；
S2: medicament Na is added to the waste water entered in second order reaction pond by the second medicine system2CO3, flocculant and flocculation aid,
Agitated machine is sufficiently stirred, and medicament and waste water are sufficiently mixed, react, and the waste water after sedimentation enters from the water outlet in second order reaction pond
Subsequent processing unit, the precipitating of bottom are delivered to flue gas wet desulphurization process section by sludge reflux pump in form of a sludge.
2. a kind of desulfurization wastewater secondary softening scale removal according to claim 1 and sludge reuse treatment process, feature exist
In: first reaction tank and the second reaction tank include the first dosing chamber, the second dosing chamber and sedimentation chamber.
3. a kind of desulfurization wastewater secondary softening scale removal according to claim 2 and sludge reuse treatment process, feature exist
In: first medicine system is connected to the first dosing chamber in first order reaction pond and the second dosing chamber respectively by chemical feed pipe, institute
The sedimentation chamber bottom for stating first order reaction pond is connect with sludge delivery pump.
4. a kind of desulfurization wastewater secondary softening scale removal according to claim 2 and sludge reuse treatment process, feature exist
In: second medicine system is connected to the first dosing chamber in second order reaction pond and the second dosing chamber respectively by chemical feed pipe, institute
The sedimentation chamber bottom for stating second order reaction pond is connect with sludge reflux pump.
5. a kind of desulfurization wastewater secondary softening scale removal according to claim 2 and sludge reuse treatment process, feature exist
Blender is equipped in: the first dosing chamber and the second dosing are intracavitary, the sedimentation chamber water outlet is equipped with strainer.
6. a kind of desulfurization wastewater secondary softening scale removal according to claim 1 and sludge reuse treatment process, feature exist
In: the outlet of the sludge reflux pump is equipped with mud return line, and one end of the mud return line is connect with sludge treating system.
7. a kind of desulfurization wastewater secondary softening scale removal according to claim 1 and sludge reuse treatment process, feature exist
In: the flocculant is one or more of aluminium polychloride, polyaluminium sulfate, poly-ferric chloride and polysilicon acid.
8. a kind of desulfurization wastewater secondary softening scale removal according to claim 1 and sludge reuse treatment process, feature exist
In: the flocculation aid is activated silicic acid, polyacrylamide and one or more of gelatine and sodium alginate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810256841.7A CN110156181A (en) | 2018-03-27 | 2018-03-27 | A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process |
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| CN201810256841.7A CN110156181A (en) | 2018-03-27 | 2018-03-27 | A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5213782A (en) * | 1991-11-22 | 1993-05-25 | Electric Power Research Institute | Clear liquor scrubbing magnesium-enhanced lime flue gas desulfurization process |
| WO2001096240A1 (en) * | 2000-06-15 | 2001-12-20 | Ciba Specialty Chemicals Water Treatments Limited | Stabilised calcium hydroxide slurries |
| CN105439358A (en) * | 2015-12-30 | 2016-03-30 | 北京清大国华环境股份有限公司 | Method and device for realizing zero discharge of desulfurization wastewater |
| 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 |
| CN105967389A (en) * | 2016-05-31 | 2016-09-28 | 江苏京源环保股份有限公司 | Desulfurization waste water sludge separation and salt separation zero-emission pretreatment system and process |
| CN206467062U (en) * | 2016-12-27 | 2017-09-05 | 武汉凯迪电力环保有限公司 | Three-stage for desulfurization wastewater zero-discharge technology softens pre-processing device |
| CN107265696A (en) * | 2017-07-12 | 2017-10-20 | 大唐环境产业集团股份有限公司 | A kind of desulfurization wastewater sofening treatment device and method |
-
2018
- 2018-03-27 CN CN201810256841.7A patent/CN110156181A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5213782A (en) * | 1991-11-22 | 1993-05-25 | Electric Power Research Institute | Clear liquor scrubbing magnesium-enhanced lime flue gas desulfurization process |
| WO2001096240A1 (en) * | 2000-06-15 | 2001-12-20 | Ciba Specialty Chemicals Water Treatments Limited | Stabilised calcium hydroxide slurries |
| CN105439358A (en) * | 2015-12-30 | 2016-03-30 | 北京清大国华环境股份有限公司 | Method and device for realizing zero discharge of desulfurization wastewater |
| 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 |
| CN105967389A (en) * | 2016-05-31 | 2016-09-28 | 江苏京源环保股份有限公司 | Desulfurization waste water sludge separation and salt separation zero-emission pretreatment system and process |
| CN206467062U (en) * | 2016-12-27 | 2017-09-05 | 武汉凯迪电力环保有限公司 | Three-stage for desulfurization wastewater zero-discharge technology softens pre-processing device |
| CN107265696A (en) * | 2017-07-12 | 2017-10-20 | 大唐环境产业集团股份有限公司 | A kind of desulfurization wastewater sofening treatment device and method |
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Application publication date: 20190823 |