CN108439644A - A kind of processing of desulfurization wastewater and chemical industry for making chlorine and alkali technique link processing system - Google Patents
A kind of processing of desulfurization wastewater and chemical industry for making chlorine and alkali technique link processing system Download PDFInfo
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- CN108439644A CN108439644A CN201810339496.3A CN201810339496A CN108439644A CN 108439644 A CN108439644 A CN 108439644A CN 201810339496 A CN201810339496 A CN 201810339496A CN 108439644 A CN108439644 A CN 108439644A
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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
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- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/04—Hypochlorous acid
- C01B11/06—Hypochlorites
- C01B11/062—Hypochlorites of alkali metals
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- 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
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Abstract
The present invention provides a kind of processing of desulfurization wastewater and chemical industry for making chlorine and alkali technique linkage processing system, including preformed precipitate system, melded system and sodium hypochlorite configure system, the preformed precipitate system, including preformed precipitate pond, preformed precipitate pond top is respectively equipped with water intake and preformed precipitate overflowing liquid water outlet, preformed precipitate bottom of pond end is exported equipped with the first precipitating sludge, the melded system includes softening pond, the softening pond top is respectively equipped with preformed precipitate overflowing liquid water inlet and softened water water outlet, the preformed precipitate overflowing liquid water inlet is connected to preformed precipitate overflowing liquid water outlet by pipeline, the softening bottom of pond end is exported equipped with the second precipitating sludge, the sodium hypochlorite configuration system includes sequentially connected mixer, sodium hypochlorite reaction tank and sodium hypochlorite reaction tower, the softened water water outlet is connected to the mixer by pipeline.The system realizes the coupling of wastewater treatment and process units.
Description
Technical field
The invention belongs to chemical engineering industry technical fields, and in particular to a kind of processing of desulfurization wastewater links with chemical industry for making chlorine and alkali technique
Processing system.
Background technology
Waste water caused by the wet process of FGD of steam power plant, general weakly acidic, water is little, but containing there are many pollutions
Object, such as organic matter, suspended matter, fluoride, micro heavy, while having the characteristics that extreme hardness and extremely low basicity.At present
It is that desulfurization wastewater is handled using physico-chemical process (chemical coagulation+sedimentation basin), is claimed in the industry at once after preliminary sedimentation processing mostly
Three header techniques.Desulfurization wastewater eliminates most suspended substances, few hardness and heavy metal after conventional three headers processing.
But salt content is still very high, and generally in 2-3%, main component cation is sodium, calcium, magnesium, and anion is chlorine, sulfate radical, carbonic acid
Root etc., contains certain suspended matter, COD, ammonia nitrogen etc. simultaneously, therefore desulfurization wastewater is up to standard that treated that advanced treating is very tired
The calcium and magnesium ingredient of difficulty, especially wherein high concentration handles either special type RO separation or evaporator, can all bring pole
Big trouble.In addition, most of three header processing equipments are because of a variety of causes, even for suspended solid, fluorine ion, a various huge sum of moneys
Belong to, can not really reach good removing in fact.Only the water of this kind of waste water is smaller, and most power plant are through the letter of three headers
After single processing, that is, it is used as and rushes the uses such as ash so that the limitation of traditional handicraft is not shown.
The domestic processing for being directed to desulfurization wastewater has the tendency that newer at present, i.e. recycling reuse zero-emission is target.
At this point, in order to ensure the good operation of follow-up reuse core equipment (various RO films or evaporator), it is necessary to for the dirty ingredient of cause
(calcium, magnesium, barium, strontium, silicon etc.) is handled, and must remove it completely.It is general to select filter+nanofiltration membrane+high pressure anti-
The treatment process of osmosis membrane filters+disc tube reverse osmosis (dt-ro) membrane filtration+three-effect evaporation and condensation, this technique not only high energy consumption, cost is big,
And it does not put into production formally in experimental stage so far.
Invention content
Technical problem to be solved by the invention is to provide a kind of low cost, low energy consumption, Sewage treatment utilization rate height, zero-emissions
The desulfurization wastewater processing put and chemical industry for making chlorine and alkali technique linkage processing system.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of processing of desulfurization wastewater joins with chemical industry for making chlorine and alkali technique
Dynamic processing system, including preformed precipitate system, melded system and sodium hypochlorite configure system, and the preformed precipitate system includes preformed precipitate
Pond, preformed precipitate pond top are respectively equipped with water intake and preformed precipitate overflowing liquid water outlet, and preformed precipitate bottom of pond end is set
It includes softening pond to have the outlet of the first precipitating sludge, the melded system, and the softening pond top is respectively equipped with preformed precipitate overflowing liquid
Water inlet and softened water water outlet, the preformed precipitate overflowing liquid water inlet are connected to preformed precipitate overflowing liquid water outlet by pipeline,
The softening bottom of pond end is exported equipped with the second precipitating sludge, sodium hypochlorite configuration system include sequentially connected mixer,
Sodium hypochlorite reaction tank and sodium hypochlorite reaction tower, the softened water water outlet are connected to the mixer by pipeline.
Based on the above technical solution, the present invention can also have following further specific choice or optimum choice.
Specifically, the melded system further includes filter device, the filter device is arranged in the softened water water outlet
On connecting pipe between the mixer.
Specifically, being provided on connecting pipe between the filter device and the mixer for filling the filtering
The water outlet set is promoted to the elevator pump of the mixer.
Specifically, the sodium hypochlorite configuration system further includes cooler, the water inlet of the cooler and the secondary chlorine
The water outlet of sour sodium reaction tower is connected to.
Specifically, the sodium hypochlorite configuration system further includes exhaust gas absorption device, the air inlet of the exhaust gas absorption device
Mouth is connected to the gas outlet of the sodium hypochlorite reaction tower.
Specifically, the melded system further includes integral water purifying device, clear water tanks, middle water pump, filter device, reuse
The water inlet of water tank, the integral water purifying device is connected to preformed precipitate overflowing liquid water outlet by overflow manner, the water purification
The water inlet of case is connected to integral water purifying device water outlet by pipeline, the water inlet of the filter device and the clear water tanks
Water outlet is connected to by middle water pump, and the water outlet of the filter device is connected to the reuse water tank import by pipeline.
Specifically, the melded system further includes elevator pump, the water outlet of the reuse water tank passes through elevator pump and outer tube
Net carrys out liquid caustic soda and is connected to by mixer.
Specifically, the sodium hypochlorite configuration system further includes mixer, secondary sodium retort, secondary sodium reaction tower, cooler,
The outlet of the mixer is connected to time entrance of sodium retort by pipeline, the liquid outlet of the secondary sodium retort and time sodium are anti-
Tower liquid inlet is answered to be connected to by pipeline, when temperature is higher than 30 degree, the liquid outlet of the secondary sodium retort and entering for the cooler
Liquid mouth is connected to by pipeline, and the liquid outlet of the cooler is connected to the liquid inlet of the sodium hypochlorite reaction tower by pipeline.
The liquid outlet of the sodium hypochlorite reaction tower is connected to time refluxing opening of sodium retort by pipeline.
Specifically, the sodium hypochlorite configuration system further includes exhaust gas absorption device, the air inlet of the exhaust gas absorption device
Mouth is connected to the gas outlet of the sodium hypochlorite reaction tower, further absorbs remaining chlorine, chlorine by another secondary sodium reaction tower
Change the gases such as ammonium.
Sodium hypochlorite configuration system further includes circulating pump, the outlet of the secondary sodium retort by elevator pump with it is described
The inlet communication of secondary sodium reaction tower.
In addition, the present invention also provides use above equipment to carry out desulfurization wastewater processing to handle with chemical industry for making chlorine and alkali technique linkage
Method comprising following steps：
1) Ca (OH) is added into desulfurization wastewater in the preformed precipitate system (1)2, organic sulfur and FeClSO4, carry out pre-
Precipitation process；
2) sodium carbonate is added into step 1) treated liquid in the melded system (2), carries out sofening treatment；
3) step 2) treated liquid is subjected to oxidation processes in sodium hypochlorite configuration system (3), removed organic
Object, COD and ammonia nitrogen.
Compared with prior art, the beneficial effects of the invention are as follows：Product low cost of the present invention, low energy consumption, Sewage treatment profit
With rate height, zero-emission can be achieved, this method evades each pollutant in desulfurization wastewater, is efficiently used by basic handling realization.
First by preformed precipitate system, most suspended substances, few hardness and heavy metal in desulfurization wastewater are removed.It is further carried out soft
Change handle, by adding sodium carbonate with remove most of calcium firmly and part magnesium it is hard, then by filter device remove be suspended in water
In small calcium carbonate particles, production water mixed with alkali, further pass through equipment for producing sodium hypochlorite removing organic matter, COD, ammonia nitrogen.
Sewage treatment utilization is realized, and effectively produces part finished product, and applied to the acetylene cleaning device of chlor-alkali production, it is real
The further coupling of existing wastewater treatment and process units.
Description of the drawings
Fig. 1 is the technological process of a kind of desulfurization wastewater processing and chemical industry for making chlorine and alkali technique linkage processing system provided by the invention
Figure.
In figure：1, preformed precipitate system；2, melded system；3, sodium hypochlorite configures system；11, preformed precipitate pond；12, waste water into
The mouth of a river；13, the first precipitating sludge exports；14, preformed precipitate overflowing liquid water outlet；21, soften pond；22, preformed precipitate overflowing liquid is intake
Mouthful；23, the second precipitating sludge exports；24, softened water water outlet；25, filter device；31, mixer；32, sodium hypochlorite reaction
Tank；33, sodium hypochlorite reaction tower；34, cooler.
Specific implementation mode
For a better understanding of the present invention, below in conjunction with the accompanying drawings and the specific embodiment content that the present invention is furture elucidated,
But present disclosure is not limited solely to the following examples.
Technical problem to be solved by the invention is to provide a kind of low cost, low energy consumption, Sewage treatment utilization rate height, zero-emissions
The desulfurization wastewater processing put and chemical industry for making chlorine and alkali technique linkage processing system, including preformed precipitate system 1, melded system 2 and hypochlorous acid
Sodium configures system 3, and the preformed precipitate system 1 includes preformed precipitate pond 11, and preformed precipitate pond top is respectively equipped with water intake
12 are equipped with the first precipitating sludge and export 13 with preformed precipitate overflowing liquid water outlet 14, preformed precipitate bottom of pond end, the melded system 2
Including softening pond 21,21 top of softening pond is respectively equipped with preformed precipitate overflowing liquid water inlet 22 and softened water water outlet 24, institute
It states preformed precipitate overflowing liquid water inlet 22 to be connected to by pipeline with preformed precipitate overflowing liquid water outlet 14,21 bottom end of softening pond is equipped with
Second precipitating sludge outlet 23, the sodium hypochlorite configuration system 3 includes sequentially connected mixer 31, sodium hypochlorite reaction tank
32 and sodium hypochlorite reaction tower 33, the softened water water outlet 24 be connected to by pipeline with the mixer 31.
Based on the above technical solution, the present invention can also have following further specific choice or optimum choice.
Preferably, the melded system 2 further includes filter device 25, and the setting of the filter device 25 goes out in the softened water
On connecting pipe between the mouth of a river 24 and the mixer 31.
Preferably, it is provided on the connecting pipe between the filter device 25 and the mixer 31 for by the mistake
The water outlet of filter device 25 is promoted to the elevator pump of the mixer 31.
Preferably, sodium hypochlorite configuration system 3 further includes cooler 34, the water inlet of the cooler with described time
The water outlet of sodium chlorate reaction tower 33 is connected to.
Preferably, the sodium hypochlorite configuration system 3 further includes exhaust gas absorption device, the air inlet of the exhaust gas absorption device
Mouth is connected to the gas outlet of the sodium hypochlorite reaction tower 33.
In addition, the present invention also provides use above equipment to carry out desulfurization wastewater processing to handle with chemical industry for making chlorine and alkali technique linkage
Method comprising following steps：
1) Ca (OH) is added into desulfurization wastewater in the preformed precipitate system (1)2, organic sulfur and FeClSO4, carry out pre-
Precipitation process；
2) sodium carbonate is added into step 1) treated liquid in the melded system (2), carries out sofening treatment；
3) step 2) treated liquid is subjected to oxidation processes in sodium hypochlorite configuration system (3), removed organic
Object, COD and ammonia nitrogen.
The present invention also provides desulfurization wastewater processing with chemical industry for making chlorine and alkali technique linkage processing system and using the equipment side
Method main technique principle：After desulfurization wastewater removes heavy metal using the preformed precipitate system precipitation method, the sodium carbonate liquor with 10% is pressed
According to 10:2 proportioning reaction generates calcium carbonate, adds a small amount of sodium hydroxide, PH to be adjusted to 9.0 or so, reacts life with magnesium ion in water
At magnesium hydroxide softened water is obtained after removing calcium, magnesium.The control of softened water calcium is requiring sodium carbonate not excessive in 20-100mg/l
On the basis of, while meeting the clarity requirement of softened water configuration time sodium.Softened water is being sent to equipment for producing sodium hypochlorite, utilizes
Enough sodium hypochlorite dosage is provided, the ammonia nitrogen in water is converted to nitrogen by series reaction and removes, synchronization process recycled water
Substitute time sodium reaction water.COD main components inferior sulfate radical is oxidized to sulfate radical in water in desulfurizing tower, removes COD.And it obtains just
Normal sodium hypochlorite finished product.Overall reaction equation is as follows：
2NH3+3NaClO→N2↑+3H2O+3NaCL
Except COD equations are:ClOˉ+SO3 2ˉ→Clˉ+SO4 2ˉ
Ammonia nitrogen and COD are to be not detected in finished product time sodium, and finished product time sodium free chlorine, free alkali are qualified.Dissociate in order to control
The control of alkali softened water calcium, increases reflux, is reprocessed to underproof softened water.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of desulfurization wastewater processing and chemical industry for making chlorine and alkali technique linkage processing system, which is characterized in that including preformed precipitate system
(1), melded system (2) and sodium hypochlorite configuration system (3), the preformed precipitate system (1) includes preformed precipitate pond (11), described pre-
Sedimentation basin top is respectively equipped with water intake (12) and preformed precipitate overflowing liquid water outlet (14), and preformed precipitate bottom of pond end is equipped with
First precipitating sludge exports (13), and the melded system (2) includes softening pond (21), and softening pond (21) top is respectively equipped with
Preformed precipitate overflowing liquid water inlet (22) and softened water water outlet (24), the preformed precipitate overflowing liquid water inlet (22) are overflow with preformed precipitate
Flow liquid water outlet (14) is connected to by pipeline, and softening pond (21) bottom end is equipped with the second precipitating sludge and exports (23), described time
It includes sequentially connected mixer (31), sodium hypochlorite reaction tank (32) and sodium hypochlorite reaction tower that sodium chlorate, which configures system (3),
(33), the softened water water outlet (24) is connected to the mixer (31) by pipeline.
2. a kind of desulfurization wastewater processing according to claim 1 and chemical industry for making chlorine and alkali technique linkage processing system, feature exist
In：The melded system (2) further includes filter device (25), and the filter device (25) is arranged in the softened water water outlet
(24) on the connecting pipe between the mixer (31).
3. a kind of desulfurization wastewater processing according to claim 2 and chemical industry for making chlorine and alkali technique linkage processing system, feature exist
In：It is provided on connecting pipe between the filter device (25) and the mixer (31) for by the filter device
(25) water outlet is promoted to the elevator pump of the mixer (31).
4. a kind of desulfurization wastewater processing according to claim 1 and chemical industry for making chlorine and alkali technique linkage processing system, feature exist
In：The sodium hypochlorite configuration system (3) further includes cooler (34), and the water inlet of the cooler and the sodium hypochlorite are anti-
The water outlet of tower (33) is answered to be connected to.
5. a kind of desulfurization wastewater processing according to claim 1 and chemical industry for making chlorine and alkali technique linkage processing system, feature exist
In：Sodium hypochlorite configuration system (3) further includes exhaust gas absorption device, the air inlet of the exhaust gas absorption device with described time
The gas outlet of sodium chlorate reaction tower (33) is connected to.
6. a kind of carried out using the equipment as described in claim any one of 1-5 at desulfurization wastewater processing and chemical industry for making chlorine and alkali technique linkage
The method of reason, which is characterized in that include the following steps：
1) Ca (OH) is added into desulfurization wastewater in the preformed precipitate system (1)2, organic sulfur and FeClSO4, carry out preformed precipitate
Processing；
2) sodium carbonate is added into step 1) treated liquid in the melded system (2), carries out sofening treatment；
3) step 2) treated liquid is subjected to oxidation processes in sodium hypochlorite configuration system (3), remove organic matter,
COD and ammonia nitrogen.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110028178A (en) * | 2019-04-17 | 2019-07-19 | 新疆中泰化学阜康能源有限公司 | The method and device thereof of coagulation chemical oxidation coprecipitation method processing desulfurization wastewater |
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| 李同春;: "烧结烟气脱硫废水零排放处理实践", 金属材料与冶金工程, no. 05, pages 35 - 37 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110028178A (en) * | 2019-04-17 | 2019-07-19 | 新疆中泰化学阜康能源有限公司 | The method and device thereof of coagulation chemical oxidation coprecipitation method processing desulfurization wastewater |
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