CN106927607A - A kind of electric flocculation desulfurization wastewater zero-emission pretreating process - Google Patents
A kind of electric flocculation desulfurization wastewater zero-emission pretreating process Download PDFInfo
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- CN106927607A CN106927607A CN201710251098.1A CN201710251098A CN106927607A CN 106927607 A CN106927607 A CN 106927607A CN 201710251098 A CN201710251098 A CN 201710251098A CN 106927607 A CN106927607 A CN 106927607A
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- Prior art keywords
- electric flocculation
- desulfurization wastewater
- electric
- particulate matter
- chemical tendering
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
-
- 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
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of electric flocculation desulfurization wastewater zero-emission pretreating process, including：Desulfurization wastewater is cached first in former pond, homogeneous, is then pumped to electric flocculation device；In electric flocculation device, the particulate matter in desulfurization wastewater condenses under electric field action, and tiny particulate gradually forms bulky grain, and makes particulate matter continuous loading electric charge in waste water, electric flocculation effect is continuingly acted on the particulate matter separated out in follow-up softening process；Under the oxidation of electric flocculation device, desulfurization wastewater COD is minimized, and electric flocculation device produces water and enters chemical tendering process section；Enter clarification spoil disposal technique through the desulfurization wastewater after chemical tendering, supernatant enters clear water reserviors, sludge outward transport disposal.By the oxidation of electric flocculation, the desulfurization wastewater COD after treatment is reduced to below 50mg/L to the present invention, alternative traditional aerating oxidation or the oxidizing handling process for waiting reduction COD.
Description
Technical field
The invention belongs to environmental protection industry (epi) field, and in particular to one kind is hard for power plant desulfurization waste water and other high salt degree, height
Spend the zero-emission pretreating process of industrial wastewater.
Background technology
Cl containing high concentration in the desulfurization wastewater that thermal power plant's limestone-gypsum method is produced-、SO4 2-、Na+、Ca2+、Mg2+,
It is typical high salt, high rigidity waste water.
At present, domestic and international Desulphurization for Coal-fired Power Plant wastewater zero discharge project uses " pretreatment+evaporative crystallization " technique road mostly
Line, some projects are concentrated, to reduce evaporation load using film after the pre-treatment in order to reduce evaporation capacity.To ensure the length of system
Phase stable operation, no matter using which kind of concentration and crystallization processes, being required for carrying out softening pretreatment.
Sludge quantum of output accounts for the 6% ~ 13% of feedwater quality flow in preprocessing process, and traditional desulfurization wastewater zero-emission is pre-
In handling process, in order to strengthen the sedimentation function of sludge, it is necessary to dosing coagulant and flocculation aid, because sludge quantity is larger, coagulation
The dosage of agent and flocculation aid is consequently increased, and coagulant and flocculation aid dosing expense reach 5 ~ 12 yuan/ton of waste water.
Due to being rich in plurality of inorganic salt ion in desulfurization wastewater, the softening medicament that softening preprocessing process is added can change again
The soda acid characteristic of waste water, coagulant and the flocculation aid using effect in water quality complicated and changeable are had a greatly reduced quality, can only be by adding
Excessive coagulant and flocculation aid can be only achieved expected clarifying effect.The flocculation aid for excessively adding improves waste water viscosity, causes
Serious, heat transfer coefficient reduction that subsequent ultrafiltration and counter-infiltration are easily blocked and evaporation process is bubbled, influence successive depths handling process
Normal operation.
The content of the invention
Goal of the invention：The invention aims to solve deficiency of the prior art, there is provided one kind passes through electric flocculation
Oxidation, the desulfurization wastewater COD after treatment is reduced to below 50mg/L, alternative traditional aerating oxidation or oxidant oxygen
Change etc. reduces the handling process of COD.
Technical scheme：A kind of electric flocculation desulfurization wastewater zero-emission pretreating process of the present invention, including following step
Suddenly：
1) desulfurization wastewater cached first in former pond, homogeneous, be then pumped to electric flocculation device；
2) in electric flocculation device, the particulate matter in desulfurization wastewater is condensed under electric field action, and tiny particulate is gradually formed greatly
Particle, and make particulate matter continuous loading electric charge in waste water, electric flocculation effect is separated out in continuingly acting on follow-up softening process
Particulate matter；
3) under the oxidation of electric flocculation device, desulfurization wastewater COD is minimized；
4) electric flocculation device produces water into chemical tendering process section, can use various chemical tendering techniques；Electric flocculation device with it is each
Planting chemical tendering technique has good matching, and the precipitation sediment to various chemical tendering techniques has good cohesion to make
With；
5) clarification-spoil disposal technique is entered through the desulfurization wastewater after chemical tendering, supernatant enters clear water reserviors, sludge outward transport disposal.
Further, step 3）In water outlet COD indexs be not higher than 50mg/L.
Further, step 3）In chemical tendering technique include lime soda ash tenderizer, double alkali tenderizers, lime flue
Gas tenderizer or lime-soda ash-caustic soda tenderizer.
Beneficial effect：Beneficial effects of the present invention are as follows：
1) electric flocculation device substitutes the adding equipment of coagulant and flocculation aid and exempts dosing cost, electric flocculation device power consumption
0.25 ~ 0.5kW/ tons of waste water, operating cost is less than traditional dosing technique.
2) by the oxidation of electric flocculation, the desulfurization wastewater COD after treatment is reduced to below 50mg/L, alternative biography
The aerating oxidation of system or the handling process for reducing COD such as oxidizing.
3) desulfurization wastewater processed by electric flocculation device, viscosity will not be raised, and be conducive to follow-up film process and evaporation to tie
Brilliant process stabilizing operation.
4) electric flocculation utensil has in wide in range flow condition（Including salt content, pH value, solid content etc.）Lower stable operation
Ability, it is to avoid traditional dosing flocculation due to caused by water quality difference flocculating effect it is undesirable.
5) electric flocculation device is full-automatic, unattended operation, is not required to manually make up a prescription, and mitigates operations staff's labour intensity.
Brief description of the drawings
Fig. 1 is process chart of the invention.
Specific embodiment
A kind of electric flocculation desulfurization wastewater zero-emission pretreating process as shown in Figure 1, comprises the following steps：
1) desulfurization wastewater cached first in former pond, homogeneous, be then pumped to electric flocculation device；
2) in electric flocculation device, the particulate matter in desulfurization wastewater is condensed under electric field action, and tiny particulate is gradually formed greatly
Particle, and make particulate matter continuous loading electric charge in waste water, electric flocculation effect is separated out in continuingly acting on follow-up softening process
Particulate matter；
3) under the oxidation of electric flocculation device, desulfurization wastewater COD is minimized, and water outlet COD indexs are not higher than 50mg/L；
4) electric flocculation device produces water into chemical tendering process section, can use various chemical tendering techniques, chemical tendering technique bag
Include lime soda ash tenderizer, double alkali tenderizers, lime-flue gas tenderizer or lime-soda ash-caustic soda tenderizer；Electric flocculation device
There is good matching with various chemical tendering techniques, have good coagulating to the precipitation sediment of various chemical tendering techniques
Poly- effect；
5) clarification-spoil disposal technique is entered through the desulfurization wastewater after chemical tendering, supernatant enters clear water reserviors, sludge outward transport disposal.
Electric flocculation principle of device：By its both inner pad and current feedback circuit come the water body additional electrical to inflow device
Stream, the particulate matter in water is condensed into the purpose of floccule precipitation so as to reach.The pole plate of electric flocculation system is submerged in water,
Electric current is set to import water body by pole plate by external power source, sewage will occur a series of electrochemistry mistake in the presence of electric current
Journey, including：Electric charge cohesion, demulsification, bleaching and oxidation, the general stream of electronics etc., in the presence of various chemical processes, in waste water
Particulate matter is finally able to flocculation sediment, and producing water turbidity after further clarification is less than 5mg/L.
This patent proposes a kind of electric flocculation desulfurization wastewater zero-emission pretreating process, with following advantage：
1) electric flocculation device substitutes the adding equipment of coagulant and flocculation aid and exempts dosing cost, electric flocculation device power consumption
0.25 ~ 0.5kW/ tons of waste water, operating cost is less than traditional dosing technique.
2) by the oxidation of electric flocculation, the desulfurization wastewater COD after treatment is reduced to below 50mg/L, alternative biography
The aerating oxidation of system or the handling process for reducing COD such as oxidizing.
3) desulfurization wastewater processed by electric flocculation device, viscosity will not be raised, and be conducive to follow-up film process and evaporation to tie
Brilliant process stabilizing operation.
4) electric flocculation utensil has in wide in range flow condition（Including salt content, pH value, solid content etc.）Lower stable operation
Ability, it is to avoid traditional dosing flocculation due to caused by water quality difference flocculating effect it is undesirable.
5) electric flocculation device is full-automatic, unattended operation, is not required to manually make up a prescription, and mitigates operations staff's labour intensity.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when making a little change or modification using the technology contents of the disclosure above
It is the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to technical spirit of the invention
Any simple modification, equivalent variations and the modification made to above example, still fall within the range of technical solution of the present invention.
Claims (3)
1. a kind of electric flocculation desulfurization wastewater zero-emission pretreating process, it is characterised in that：Comprise the following steps：
1) desulfurization wastewater cached first in former pond, homogeneous, be then pumped to electric flocculation device；
2) in electric flocculation device, the particulate matter in desulfurization wastewater is condensed under electric field action, and tiny particulate is gradually formed greatly
Particle, and make particulate matter continuous loading electric charge in waste water, electric flocculation effect is separated out in continuingly acting on follow-up softening process
Particulate matter；
3) under the oxidation of electric flocculation device, desulfurization wastewater COD is minimized；
4) electric flocculation device produces water into chemical tendering process section, can use various chemical tendering techniques；Electric flocculation device with it is each
Planting chemical tendering technique has good matching, and the precipitation sediment to various chemical tendering techniques has good cohesion to make
With；
5) clarification-spoil disposal technique is entered through the desulfurization wastewater after chemical tendering, supernatant enters clear water reserviors, sludge outward transport disposal.
2. a kind of electric flocculation desulfurization wastewater zero-emission pretreating process according to claim 1, it is characterised in that：Step
3）In water outlet COD indexs be not higher than 50mg/L.
3. a kind of electric flocculation desulfurization wastewater zero-emission pretreating process according to claim 1, it is characterised in that：Step
3）In chemical tendering technique include lime soda ash tenderizer, double alkali tenderizers, lime-flue gas tenderizer or lime-soda ash-
Caustic soda tenderizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710251098.1A CN106927607A (en) | 2017-04-18 | 2017-04-18 | A kind of electric flocculation desulfurization wastewater zero-emission pretreating process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710251098.1A CN106927607A (en) | 2017-04-18 | 2017-04-18 | A kind of electric flocculation desulfurization wastewater zero-emission pretreating process |
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| Publication Number | Publication Date |
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| CN106927607A true CN106927607A (en) | 2017-07-07 |
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| CN201710251098.1A Pending CN106927607A (en) | 2017-04-18 | 2017-04-18 | A kind of electric flocculation desulfurization wastewater zero-emission pretreating process |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254104A (en) * | 2015-11-06 | 2016-01-20 | 江苏京源环保股份有限公司 | Desulphurization wastewater zero discharge treatment process for power plant with low running cost |
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2017
- 2017-04-18 CN CN201710251098.1A patent/CN106927607A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254104A (en) * | 2015-11-06 | 2016-01-20 | 江苏京源环保股份有限公司 | Desulphurization wastewater zero discharge treatment process for power plant with low running cost |
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Application publication date: 20170707 |
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