CN1982230A - Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer - Google Patents
Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer Download PDFInfo
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- CN1982230A CN1982230A CN 200510122303 CN200510122303A CN1982230A CN 1982230 A CN1982230 A CN 1982230A CN 200510122303 CN200510122303 CN 200510122303 CN 200510122303 A CN200510122303 A CN 200510122303A CN 1982230 A CN1982230 A CN 1982230A
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Abstract
Alkali treatment for sea water with sodium hydrate as basifier is carried out by regulating sea-water pH value by basifier addition, reacting magnesium salt with alkali to generate magnesium hydrate with strong adsorptive function, and adsorbing rapidly electric colloid, suspended substance, microbe, bacterial and algae. It has faster flocculation depositing speed, gentle reactive condition, simple process and less investment. It can be used as acid waster-water neutralizer and magnesium hydrate slurry.
Description
Technical field
The present invention adopts sodium hydroxide etc. to be basifier, directly seawater is carried out alkalinisation treatment, and the seawater after the alkalinisation treatment reaches the purpose of degree of depth turbidity removal, and coproduction magnesium hydroxide slurry can be used as the acid waste water neutralizing agent in sea water advanced turbidity removal.
Background technology
Current China water resources critical shortage, most existing water system have all caused pollution and destruction in various degree, and it is extremely urgent to develop new Freshwater resources.Seawater is the abundantest in the water resources, supplies the most stable water source, and the water yield is not subjected to the influence of factors such as weather.Carry out the seawater cleaning technical study, the development and use seawater is imperative.At present, it is a lot of to require that seawater is carried out the pretreated industry of degree of depth turbidity removal, two aspects of the wherein main extraction that useful component in seawater utilization (comprising sea water desaltination and direct seawater utilization) and the seawater is arranged (comprising salt manufacturing and the extraction of other useful component).In recent years, the reverse osmosis seawater desalting technology has obtained using widely, the core component of this technology is a reverse osmosis membrane, film is higher to the water quality requirement of water inlet, directly desalinate without pre-treatment, can cause film to pollute very soon, and the film pollution is to cause the membrane module life-span short, the major cause that the sea water desaltination cost is high.Therefore, must carry out degree of depth turbidity removal pre-treatment, fundamentally reduce the sea water desaltination processing cost seawater.
The Bohai Sea is contaminated serious near the seawater of seashore, existing suspended substance, colloid and dissolved substance in the water, also have pollution substances such as large amount of organic, microorganism, bacterium, algae, extracting inorganic salt etc. from seawater also all needs seawater is carried out degree of depth turbidity removal pre-treatment, guarantee that extract has good purity, thereby simplify follow-up purification processes technology.This method not only can reach the degree of depth and remove turbidity, also has functions such as sterilization, reduction SDI simultaneously.
Sweetening agent or the acid waste water neutralizing agent that generally uses both at home and abroad is milk of lime at present, in recent years, because magnesium hydroxide has stronger shock-absorbing capacity (the pH value is the highest to be no more than 9), higher activity and absorption property, and handle the safe and reliable special performances such as corrodibility that do not have, have broad application prospects as a kind of environmentally friendly acidic substance neutralizing agent.
Domestic some coastland has been carried out the construction of sea water desaltination demonstration project, but the pretreated research report of the special sea water desaltination degree of depth and few.What have also all is to adopt the inorganic flocculating agent pre-treatment of flocculating separately, and traditional inorganic flocculating agent corrodibility is extremely strong, device is caused heavy corrosion, water turbidity index after the processing still is difficult to reach requirement, make the aftertreatment burden, directly influence sea water desaltination and other seawater utilization cost.
Summary of the invention
Accompanying drawing is seen in this basifier technical process of flocculating.
Adopt sea crystal configuration simulated seawater, in room temperature, stirring velocity 100～300r/min adds basifier such as sodium hydroxide down, calcium hydroxide, ammoniacal liquor etc. or (basifier and trace iron class flocculation agent) are regulated the pH value and carry out flocculation reaction in 9～13 scopes, because the flco of this moment is very little, settling velocity is very slow, therefore adding the settling agent polyacrylamide makes its flco become big, the add-on of settling agent is in 0.15～5ppm scope, to quicken its settling velocity, precipitin reaction finishes, after static for some time, supernatant liquid is low turbid seawater, and lower floor is hydrogeneous magnesian slurry, and slurry becomes through washing that to contain magnesium hydroxide be 20～40% slurry.
The invention has the advantages that:
1, coproduction acid waste water neutralizing agent (or sweetening agent) when carrying out sea water advanced turbidity removal;
2, the method for the micro-flocculation agent of proposition adding reaches the purpose of further reduction turbidity of sea water;
3, the method that proposes the micro-settling agent of adding realizes that flco filters and make things convenient for the purpose of industrialization fast.
Embodiment
Example one
Add the turbidity removal effect that sodium hydroxide is regulated seawater pH value for investigating, measuring the 600ml seawater stirs with 250r/min speed, at room temperature, add the pH value of the sodium hydroxide solution adjusting seawater of 4mol/L, behind the stirring 10min, add the polyacrylamide (PAM) of 0.15ppm, regulate stirring velocity, under 120r/min, stir 1min, leave standstill 10h, measure its turbidity.Former turbidity of sea water: 49.30NTU, the pH value: 8.01, water temperature: 14 ℃, result sees the following form.
The different pH value of table one is to the turbidity removal effect of seawater
| The test sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| pH | 10.31 | 10.59 | 10.66 | 11.02 | 11.51 | 12.00 | 12.50 |
| Residual turbidity (NTU) | 1.38 | 0.38 | 0.16 | 0.26 | 0.53 | 0.65 | 1.32 |
Can find out that from table one turbidity removal effect of seawater is better when regulating the pH value to 10.59-11.51 with sodium hydroxide, is that 10.66 o'clock effects are best at pH.
Example two
Add the turbidity removal effect of micro-poly-ferric chloride under the identical pH value for investigating to seawater, measuring 600ml seawater low whipping speed is about 250r/min, under the room temperature condition, the sodium hydroxide solution that adds 4mol/L is regulated pH value to 10.59, adds micro-poly-ferric chloride (PFC), behind the stirring 10min, adding concentration is 0.2% polyacrylamide (PAM) 0.15ppm, under 120r/min, stir 1min, leave standstill 10h, measure its turbidity.Former turbidity of sea water: 49.30NTU, the pH value: 8.01, water temperature: 14 ℃, result sees the following form.
The identical PFC add-on of table two is to the turbidity removal effect of seawater
| The test sequence number | 1 | 2 | 3 | 4 | 5 |
| PFC add-on (ppm) | 0.037 | 0.073 | 0.110 | 0.147 | 0.183 |
| Residual turbidity (NTU) | 0.90 | 0.72 | 0.27 | 0.69 | 0.78 |
Can find out that from table two with sodium hydroxide the pH value of seawater is adjusted at 10.59 o'clock, the turbidity removal effect to seawater when the add-on of PFC is 0.110ppm is better.
Example three
For investigating under the different pH values calcium hydroxide to the turbidity removal effect of seawater, measuring the 600ml seawater stirs in 250r/min speed, at room temperature, the aqua calcis that adds 0.023mol/L is regulated the pH value, after stirring 10min, add polyacrylamide (PAM) 0.15ppm, under 120r/min, stir 1min, leave standstill 10h, measure its turbidity.Former turbidity of sea water: 49.30NTU, the pH value: 8.01, water temperature: 14 ℃, result sees the following form.
The different pH value of table three is to the turbidity removal effect of seawater
| The test sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| pH | 9.69 | 9.78 | 9.83 | 9.90 | 9.99 | 10.06 | 10.13 |
| Residual turbidity (NTU) | 2.80 | 2.00 | 1.90 | 1.70 | 0.8 | 0.50 | 1.20 |
Can find out the value to 10.06 with calcium hydroxide adjusting pH from table three, turbidity removal effect is better.
Example four
For investigating under the different pH values ammoniacal liquor to the turbidity removal effect of seawater, measuring the 600ml seawater stirs in 250r/min speed, at room temperature, the ammonia soln that adds 2.0mol/L is regulated the pH value, after stirring 10min, add polyacrylamide (PAM) 0.15ppm, under 120r/min, stir 1min, leave standstill 10h, measure its turbidity.Former turbidity of sea water: 49.30NTU, the pH value: 8.01, water temperature: 14 ℃, result sees the following form.
The different pH value of table four is to the turbidity removal effect of seawater
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 |
| pH | 9.30 | 9.35 | 9.40 | 9.45 | 9.50 | 9.55 |
| Residual turbidity (NTU) | 6.30 | 3.00 | 5.20 | 0.80 | 4.80 | 4.80 |
Can find out that from table four pH value to 9.45 turbidity removal effect of regulating seawater with ammoniacal liquor is better.
Claims (4)
1, the method for sea water advanced turbidity removal and coproduction acid waste water neutralizing agent.Its production technique feature is: employing sodium hydroxide etc. is basifier, directly seawater is carried out alkalinisation treatment, regulate the pH value of seawater in 9～13 scopes by the add-on of basifier, the strong adsorption that the positively charged magnesium hydrate precipitate that utilizes magnesium salts in the seawater etc. and alkali reaction to generate has, make that pollution substances such as suspended substance, microorganism are adsorbed rapidly in charged colloidal particle in the seawater and the water, thereby realize the degree of depth turbidity removal of seawater and the purpose of coproduction acid waste water neutralizing agent (or separation of flow agent).
2, for improving the turbidity removal effect of seawater, add the efficient micro-flocculation agent of 0.1～5ppm, after precipitation such as magnesium hydroxide and small flco occurring, for improving the speed of flocculation sediment, add 0.15～5ppm polyacrylamide (PAM) again, this technology flco can conveniently be filtered, so that can realize industrialization smoothly.
3, as right 1 described alkalization process, basifier adopts sodium hydroxide, calcium hydroxide (or calcium oxide) or ammoniacal liquor; That the flocculation agent that accelerate precipitation is used adopts is polyacrylamide (PAM), and what flocculation agent adopted is inorganic polymer molysite such as iron trichloride, poly-ferric chloride and PFSC.
4, as described in the right 1,2,3, the seawater after the degree of depth turbidity removal can be used for sea water desaltination, direct seawater utilization and relevant salt manufacturing industry; The magnesium hydroxide of coproduction simultaneously slurry is applicable to acid waste water neutralization, flue gas desulfurization etc.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510122303 CN1982230A (en) | 2005-12-13 | 2005-12-13 | Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer |
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| CN 200510122303 CN1982230A (en) | 2005-12-13 | 2005-12-13 | Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer |
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| CN1982230A true CN1982230A (en) | 2007-06-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812418B (en) * | 2009-12-14 | 2011-11-02 | 国家海洋局天津海水淡化与综合利用研究所 | Halophilic decontamination bacterium and application thereof |
| CN103011468A (en) * | 2013-01-11 | 2013-04-03 | 中冶华天工程技术有限公司 | Seawater desalination pretreatment method |
| CN105731661A (en) * | 2014-12-10 | 2016-07-06 | 中国石油天然气股份有限公司 | Decalcifying agent and method for relieving scaling phenomenon in water |
| CN111032583A (en) * | 2017-07-27 | 2020-04-17 | 沙特阿拉伯石油公司 | Methods and compositions for producing seawater-based high temperature viscoelastic surfactant fluids with low fouling tendency |
| CN112789245A (en) * | 2018-07-30 | 2021-05-11 | 里克希维亚有限公司 | Compositions and methods for controlling pH in metal flotation processes |
| CN114853137A (en) * | 2022-05-12 | 2022-08-05 | 天津城建大学 | Method for cooperatively treating reactive dye and micro-plastic wastewater by coupling magnesium hydroxide and polyacrylamide |
| CN115571999A (en) * | 2022-09-06 | 2023-01-06 | 烟台大学 | Flocculation-adsorption integrated seawater purification synchronous boron removal equipment |
-
2005
- 2005-12-13 CN CN 200510122303 patent/CN1982230A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812418B (en) * | 2009-12-14 | 2011-11-02 | 国家海洋局天津海水淡化与综合利用研究所 | Halophilic decontamination bacterium and application thereof |
| CN103011468A (en) * | 2013-01-11 | 2013-04-03 | 中冶华天工程技术有限公司 | Seawater desalination pretreatment method |
| CN105731661A (en) * | 2014-12-10 | 2016-07-06 | 中国石油天然气股份有限公司 | Decalcifying agent and method for relieving scaling phenomenon in water |
| CN111032583A (en) * | 2017-07-27 | 2020-04-17 | 沙特阿拉伯石油公司 | Methods and compositions for producing seawater-based high temperature viscoelastic surfactant fluids with low fouling tendency |
| CN112789245A (en) * | 2018-07-30 | 2021-05-11 | 里克希维亚有限公司 | Compositions and methods for controlling pH in metal flotation processes |
| CN114853137A (en) * | 2022-05-12 | 2022-08-05 | 天津城建大学 | Method for cooperatively treating reactive dye and micro-plastic wastewater by coupling magnesium hydroxide and polyacrylamide |
| CN115571999A (en) * | 2022-09-06 | 2023-01-06 | 烟台大学 | Flocculation-adsorption integrated seawater purification synchronous boron removal equipment |
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