CN105293805A - High-salinity high-hardness waste water zero-discharge processing apparatus and method thereof - Google Patents
High-salinity high-hardness waste water zero-discharge processing apparatus and method thereof Download PDFInfo
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Abstract
The invention relates to a high-salinity high-hardness waste water zero-discharge processing apparatus and a method thereof. The method comprises the following steps: 1) performing physicochemical coagulation on waste water to form precipitate and colloid; 2) performing material separation on an effluent in the step 1), removing the precipitate and the colloid to reduce hardness and turbidity of the effluent; 3) performing reverse osmosis treatment on the effluent in the step 2) to remove ions in water; and 4) performing machinery evaporation treatment on the reverse osmosis effluent in the step 3), and obtaining distilled water for reuse. The apparatus and the method have the beneficial effects that 1)a physicochemical coagulation and membrane separation technology is employed for displacing the substances with high calcium magnesium hardness and easy fouling substances such as silicon dioxide, reverse osmosis membrane fouling risk is reduced, fresh water generation amount of a reverse osmosis membrane system is increased, the effluent can be reused, energy consumption for ton of water is low; and 2)low energy consumption machinery evaporation is employed, high salinity concentrated water is processed, evaporated cooling water can be reused, and concentrated water treatment is complete.
Description
Technical field
The present invention relates to sewage treatment area, the present invention relates to a kind of high salinity high rigidity wastewater zero discharge treatment unit and method particularly, the present invention relates to a kind of technique be applied in high salinity, high rigidity Sewage advanced treatment process, be particularly useful for burning power plant, landfill factory landfill leachate treatment industry, also can be applicable to the wastewater zero discharge such as iron and steel, chemical industry industry.
Background technology
The advanced treatment of high saliferous, high rigidity, high organic content waste water is a difficult problem for research both at home and abroad at present always.For percolate, its Organic pollutants concentration is high, ammonia nitrogen concentration is high and containing a large amount of soluble solid and heavy metal ion, severe contamination can be caused to the water body of surrounding and soil, conduct oneself well the healthy generation serious threat comprehended the periphery people as improper.
More and more stricter to the requirement of effluent quality after landfill leachate treatment at present, especially for the percolate that burning power plant produces, the recirculated cooling water moisturizing standard that some ring major river valley regional requirements percolate water outlets reach " urban wastewater treatment firm pollutant emission standard " middle one-level emission standard A or reach in " urban sewage reutilization industry water standard " standard (GB/T19923-2005), even because of surrounding enviroment requirement, also all can not arrange outward even if some burning power plants all products water is up to standard.Therefore the advanced treatment " zero release " of percolate be one in the urgent need to technology.
In current engineering, percolate advanced treatment adopts nanofiltration+reverse osmosis process substantially, water outlet can meet the recirculated cooling water moisturizing standard in one-level A standard or reuse water, but after nanofiltration and reverse osmosis, a large amount of dense water can be produced, wherein the dense water of nanofiltration contains a large amount of divalent-metal ions and the organic pollutant of difficult degradation, and its dense water production rate is about 15% ~ 25%; Because calcium magnesium hardness in percolate is high, silicon dioxide structure tendency is higher, reverse osmosis concentrated water is containing higher salinity, and dense water generation is about 25% ~ 30%; Then the total producing water ratio of system is about 60%.The producing water ratio dense water yield that is low, that produce is higher, cannot reach the requirement of " zero release ", and not have economically viable way temporarily for the dense water treatment of percolate in industry, in the face of so many dense water, burn power plant's reuse and have difficulties.
For the predicament faced in industry, develop a kind of economical rationality, technical feasibility further treatment technique scheme imperative, this further treatment technique is intended to reuse water production rate up to standard to improve, and residual salts grades solid matter can individual curing.
Summary of the invention
In summary of the invention part, introduce the concept of a series of reduced form, this will further describe in embodiment part.Summary of the invention part of the present invention does not also mean that the key feature and essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection domain attempting to determine technical scheme required for protection.
One aspect of the present invention provides a kind for the treatment of process of high salinity high rigidity wastewater zero discharge, comprising:
Step S1: carry out materialization coagulation to described waste water, to form precipitation and colloid;
Step S2: carry out feed separation to the water outlet of described step S1, remove described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Step S3: carry out reverse-osmosis treated to the water outlet in described step S2, to remove the ion in this water outlet;
Step S4: carry out mechanical vapor process to the reverse osmosis water outlet in described step S3, carries out reuse to obtain distilled water.
Alternatively, described in described step S4, mechanical steam recompression technology is selected in mechanical vapor process.
Alternatively, in described step S1, the pH value of described waste water is adjusted to 11.5 ~ 12.5.
Alternatively, in described step S2, micro-filtration feed separation film is selected to carry out feed separation.
Alternatively, described in described step S3, reverse-osmosis treated selects multi-section circulation pressurized treatment.
Alternatively, the salinity in described waste water is crystallized into solid, to focus on disposal in mechanical vapor process described in described step S4.
Alternatively, in described step S1, before described materialization coagulation, the step selecting membrane bioreactor to process to described waste water is also comprised further.
Present invention also offers a kind of device based on aforesaid method, comprising:
Materialization coagulation unit, for carrying out materialization coagulation to described waste water, to form precipitation and colloid;
Feed separation unit, for carrying out feed separation to the water outlet of described materialization coagulation unit, removes described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Reverse-osmosis treated unit, for carrying out reverse-osmosis treated to the water outlet of described feed separation unit, to remove the ion in water outlet;
Mechanical vapor processing unit, for carrying out mechanical vapor process to the water outlet of described reverse-osmosis treated unit, carries out reuse to obtain distilled water.
Alternatively, described materialization coagulation unit comprise set gradually pH regulator pond, sterilization pool and coagulation reaction tank.
Alternatively, described mechanical vapor processing unit at least comprises mechanical steam recompression equipment.
Alternatively, micro-filtration feed separation film is selected in described feed separation unit.
Beneficial effect of the present invention is:
1, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce reverse osmosis membrane fouling risk, can further improve the fresh water generation of reverse osmosis membrane system, producing water can reuse, and ton water consumption is low;
2, adopt less energy-consumption mechanical vapor, can process the dense water of high salinity, the water coolant after evaporation can reuse, and dense water treatment is thorough;
3, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce evaporator plant and pipeline scale risk, improve service life of equipment;
4, process high rigidity of the present invention, high salinity waste water, economical rationality, solves the predicament that dense water cannot process, and can accomplish that producing water ratio is more than 95%, close to " zero release " of water treatment.
Accompanying drawing explanation
Following accompanying drawing of the present invention in this as a part of the present invention for understanding the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 is that in prior art, percolate adopts " NF+RO " advanced treatment process schema;
Fig. 2 is that in prior art, percolate adopts " changing soft+micro-filtration+RO " advanced treatment process schema;
Fig. 3 is that in prior art, percolate adopts " changing soft+precipitation+mechanical vapor MVR " advanced treatment process schema;
Fig. 4 is that in the present invention, percolate adopts " changing soft+dense water of micro-filtration+RO+ mechanical vapor MVR " advanced treatment process schema.
Embodiment
In the following description, a large amount of concrete details is given to provide more thorough understanding of the invention.But, it will be apparent to one skilled in the art that the present invention can be implemented without the need to these details one or more.In other example, in order to avoid obscuring with the present invention, technical characteristics more well known in the art are not described.
The invention provides one and be applied in high salinity, high rigidity advanced waste treatment method, make high salinity, high rigidity waste water after this advanced treatment process process, the recirculated cooling water moisturizing standard that all product water water quality all reaches in " urban sewage reutilization industry water standard " standard (GB/T19923-2005) can be carried out reuse utilization, produce salt grade solid matter individual curing dispose.For current burning power plant refuse leachate treatment technology, its prior art case study is described below:
1) further treatment technique of existing MSW Incineration Plant percolate " NF+RO ", as shown in Figure 1:
This technical matters flow process is that filter and reverse osmosis process are directly received in MBR water outlet, wherein nanofiltration generally adopts pollution-resistant membrane, the fresh water productive rate of nanofiltration technique is about 75% ~ 85%, percolate after nanofiltration process is again through reverse osmosis process, reverse osmosis process many employings brackish water or sea water desalination membrane, the fresh water productive rate of reverse osmosis is about 70% ~ 75% of flooding quantity, then entire depth treatment system fresh water productive rate is about 50% ~ 60%.
Current technology advanced treatment concentrated solution production rate about 50% ~ 60%, wherein nanofiltration concentrated solution productive rate is about 15% ~ 25% of flooding quantity, and reverse osmosis concentrated liquid productive rate is about 25% ~ 30% of feed water by reverse osmosis amount; Because nanofiltration concentrated solution and reverse osmosis concentrated liquid water quality difference are greatly, adopt the mode of reuse respectively to dispose, but no matter adopt which kind of disposal options, so many concentrated solution is all a difficult problem concerning power plant.
2) further treatment technique that existing MSW Incineration Plant percolate " changes soft+micro-filtration+RO ", as shown in Figure 2:
This technology produces hydromining with after materialization coagulation+feed separation to the percolate MBR after biochemical treatment, water hardness after process reduces, decrease membranous system fouling risk, can further improve reverse osmosis pressure and then improve reverse osmosis produced water rate, and there is no NF dope problem, make total producing water ratio can more than 70%.Although this technological line improves part producing water ratio, be the increase in process complexity, lose more than gain.
3) further treatment technique that existing MSW Incineration Plant percolate " changes soft+precipitation+mechanical vapor MVR ", as shown in Figure 3:
This technology produces hydromining materialization coagulation+precipitate and separate to the percolate MBR after biochemical treatment, the water hardness after process reduces, and decreases evaporator system fouling risk, adopts mechanical vapor technology can make the producing water ratio of whole system more than 90%.This technological line steam output is large, and energy consumption higher (MVR ton water power consumes about 40KWh, and reverse osmosis membrane power consumption only has 4-6KWh), actual production is difficult to bear.
Therefore any method of the prior art can not be selected to process high salinity, high rigidity waste water, also do not reach less than emission standard and reuse standard after process, therefore need a kind of method and apparatus for high salinity, high rigidity wastewater treatment specially.
Embodiment 1
Be further described a kind of preferred implementation of the present invention below in conjunction with accompanying drawing, as shown in Figure 4, the technical program technical process is: change soft+dense water of micro-filtration+RO+ mechanical vapor MVR.
Described high salinity high rigidity wastewater zero emission treatment method, comprising:
Step S1: carry out materialization coagulation to described waste water, to form precipitation and colloid;
Step S2: carry out feed separation to the water outlet of described step S1, remove described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Step S3: carry out reverse-osmosis treated to the water outlet in described step S2, to remove the ion in this water outlet;
Step S4: carry out mechanical vapor process to the dense water of the reverse osmosis water outlet in described step S3, carries out reuse to obtain distilled water.
Present invention incorporates the feature of " changing soft+micro-filtration+RO " low operating cost and " changing soft+precipitation+mechanical vapor MVR " high yield water rate, share chemical tendering flocculation and reduce calcium magnesium hardness operational path, total producing water ratio is improved further, close to " zero release ", as shown in Figure 4.
The technical solution adopted in the present invention is: produce water to the percolate MBR after biochemical treatment, adopt materialization coagulation+feed separation+reverse osmosis, reverse osmosis produced Water circulation, reverse osmosis concentrated water adopts mechanically compress evaporation technology to carry out evaporation process, transpiration cooling Water circulation, the material individual curing such as the salinity solid after evaporation;
Wherein, materialization coagulation: materialization coagulation process is primarily of pH regulator pond, sterilization pool, coagulation reaction tank composition, water is through pH regulator pond, by adding alkali lye, pH value is adjusted to 11.5 ~ 12.5, enter sterilization pool afterwards, sterilization pool mainly adds clorox, and coagulation reaction tank mainly adds flocculation agent and coagulant aids.Containing a large amount of HCO3-in such as percolate, when adding alkali lye and solution ph being adjusted to 12, can generate a large amount of CO32+, and react with Ca2+, the Mg2+ in water and form CaCO3, MgCO3 and precipitate, in solution, iron ion and OH-ionic reaction form Fe (HO) 3 colloid.By above reaction, most calcium in solution, magnesium, iron, silicon form throw out or flocculating colloid and are separated with water precipitation;
Wherein, feed separation: feed separation is a kind of membrane separation process, adopts micro-filtration feed separation film, the passage of this film is large, flux is large, acid and alkali-resistance, can bear larger working pressure;
Wherein, reverse osmosis process: reverse osmosis is a kind of membrane separation process, adopt sea water desalination membrane, this film ratio of desalinization is high, reverse osmosis produced water rate can be made to control between 75 ~ 80% through multi-section circulation pressurized treatment.
Wherein, mechanical vapor technique: for reverse osmosis concentrated water, adopt mechanical vapor process, the water entering vaporizer, because removing calcium magnesium hardness, reduces equipment and pipeline scale risk; 90% of the reverse osmosis concentrated water yield can be carried out evaporative condenser, the low recycle water standard that reaches of the distilled water salt content obtained recycles; Crystallizable one-tenth solid after the evaporation of salt lease making, is convenient to focus on disposal.
The present invention adopts materialization coagulation and membrane separation process to replace nanofiltration technique in existing film further treatment technique, avoids the dense water that the nanofiltration technique stage produces, improves whole system fresh water generation;
In the present invention, materialization coagulation process is primarily of pH regulator pond, sterilization pool, coagulation reaction tank composition, and main purpose is flocculated at the suspended substance in the percolate of life process and colloid, forms flco;
Adopt feed separation film in the present invention, chemical tendering flocculation is rapidly and efficiently separated, and the passage of this film is comparatively large, flux is comparatively large, can bear larger working pressure;
The present invention adopts reverse osmosis membrane mainly to adopt sea water desalination membrane, produces water and reach production reuse standard, economical rationality after low (4-6KWh) desalination of ton water power consumption.
The present invention adopts mechanical vapor equipment (MVR), and reverse osmosis concentrated water is carried out evaporation process, and distilled water reaches production reuse standard, and after distillation, remaining solid carries out individual curing, close to " zero release " of water.
The further treatment technique of simple at present " changing soft+micro-filtration+RO ", ton water cost of investment is less, and ton water consumption is on the low side, but producing water ratio is on the low side; Simple " changing soft+precipitation+mechanical vapor MVR ", cost of investment is bigger than normal, although producing water ratio is high, but energy consumption is seriously higher, the present invention by being incorporated into technical optimization " increase a mechanical vapor MVR after changing soft+micro-filtration+RO, both can solve membranous system producing water ratio problem on the low side, higher productive rate can be reached; comprehensive method of investment cost is less, and running cost also reduces; Both can share the pre-treatment of chemical tendering as water inlet, to save technical process, reduce comprehensive method of investment cost and working cost, reduce fouling risk simultaneously, improve the work-ing life of film and MVR.
Beneficial effect of the present invention is:
1, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce reverse osmosis membrane fouling risk, can further improve the fresh water generation of reverse osmosis membrane system, producing water can reuse, and ton water consumption is low;
2, adopt less energy-consumption mechanical vapor, can process the dense water of high salinity, the water coolant after evaporation can reuse, and dense water treatment is thorough;
3, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce evaporator plant and pipeline scale risk, improve service life of equipment;
4, process high rigidity of the present invention, high salinity waste water, economical rationality, solves the predicament that dense water cannot process, and can accomplish that producing water ratio is more than 95%, close to " zero release " of water treatment.
Embodiment 2
Present invention also offers a kind of high salinity high rigidity wastewater zero discharge treatment unit, comprising:
Materialization coagulation unit, for carrying out materialization coagulation to described waste water, to form precipitation and colloid;
Feed separation unit, for carrying out feed separation to the water outlet of described materialization coagulation unit, removes described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Reverse-osmosis treated unit, for carrying out reverse-osmosis treated to the water outlet of described feed separation unit, to remove the ion in this water outlet;
Mechanical vapor processing unit, for carrying out mechanical vapor process to the dense water of reverse osmosis water outlet of described reverse-osmosis treated unit, carries out reuse to obtain distilled water.
The present invention adopts materialization coagulation and membrane separation process to replace nanofiltration technique in existing film further treatment technique, avoids the dense water that the nanofiltration technique stage produces, improves whole system fresh water generation;
In the present invention, materialization coagulation process is primarily of pH regulator pond, sterilization pool, coagulation reaction tank composition, and main purpose is flocculated at the suspended substance in the percolate of life process and colloid, forms flco;
Adopt feed separation film in the present invention, chemical tendering flocculation is rapidly and efficiently separated, and the passage of this film is comparatively large, flux is comparatively large, can bear larger working pressure;
The present invention adopts reverse osmosis membrane mainly to adopt sea water desalination membrane, produces water and reach production reuse standard, economical rationality after low (4-6KWh) desalination of ton water power consumption.
The present invention adopts mechanical vapor equipment (MVR), and reverse osmosis concentrated water is carried out evaporation process, and distilled water reaches production reuse standard, and after distillation, remaining solid carries out individual curing, close to " zero release " of water.
Beneficial effect of the present invention is:
1, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce reverse osmosis membrane fouling risk, can further improve the fresh water generation of reverse osmosis membrane system, producing water can reuse, and ton water consumption is low;
2, adopt less energy-consumption mechanical vapor, can process the dense water of high salinity, the water coolant after evaporation can reuse, and dense water treatment is thorough;
3, adopt materialization coagulation and membrane separation process to replace the easily scale forming matter such as calcium magnesium hardness in former water and silicon-dioxide, reduce evaporator plant and pipeline scale risk, improve service life of equipment;
4, process high rigidity of the present invention, high salinity waste water, economical rationality, solves the predicament that dense water cannot process, and can accomplish that producing water ratio is more than 95%, close to " zero release " of water treatment.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (11)
1. a treatment process for high salinity high rigidity wastewater zero discharge, comprising:
Step S1: carry out materialization coagulation to described waste water, to form precipitation and colloid;
Step S2: carry out feed separation to the water outlet of described step S1, remove described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Step S3: carry out reverse-osmosis treated to the water outlet in described step S2, to remove the ion in this water outlet;
Step S4: carry out mechanical vapor process to the reverse osmosis water outlet in described step S3, carries out reuse to obtain distilled water.
2. method according to claim 1, is characterized in that, described in described step S4, mechanical steam recompression technology is selected in mechanical vapor process.
3. method according to claim 1, is characterized in that, in described step S1, the pH value of described waste water is adjusted to 11.5 ~ 12.5.
4. method according to claim 1, is characterized in that, selects micro-filtration feed separation film to carry out feed separation in described step S2.
5. method according to claim 1, is characterized in that, described in described step S3, reverse-osmosis treated selects multi-section circulation pressurized treatment.
6. method according to claim 1, is characterized in that, the salinity in described waste water is crystallized into solid, to focus on disposal in mechanical vapor process described in described step S4.
7. method according to claim 1, is characterized in that, in described step S1, also comprised the step selecting membrane bioreactor to process described waste water further before described materialization coagulation.
8., based on a device for the described method of one of claim 1 to 7, comprising:
Materialization coagulation unit, for carrying out materialization coagulation to described waste water, to form precipitation and colloid;
Feed separation unit, for carrying out feed separation to the water outlet of described materialization coagulation unit, removes described precipitation and colloid, goes out water hardness and turbidity to reduce this;
Reverse-osmosis treated unit, for carrying out reverse-osmosis treated to the water outlet of described feed separation unit, to remove the ion in water outlet;
Mechanical vapor processing unit, for carrying out mechanical vapor process to the water outlet of described reverse-osmosis treated unit, carries out reuse to obtain distilled water.
9. device according to claim 8, is characterized in that, described materialization coagulation unit comprise set gradually pH regulator pond, sterilization pool and coagulation reaction tank.
10. device according to claim 8, is characterized in that, described mechanical vapor processing unit at least comprises mechanical steam recompression equipment.
11. devices according to claim 8, is characterized in that, select micro-filtration feed separation film in described feed separation unit.
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| CN106145498A (en) * | 2016-08-23 | 2016-11-23 | 华电郑州机械设计研究院有限公司 | A kind of thermal power plant high slat-containing wastewater zero-emission recovery and treatment method |
| CN108117220A (en) * | 2016-11-29 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of integrated conduct method of high slat-containing wastewater |
| CN108117225A (en) * | 2016-11-29 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of processing method of high slat-containing wastewater |
| CN108046482A (en) * | 2018-01-29 | 2018-05-18 | 广州华浩能源环保集团股份有限公司 | A kind of organic concentration wastewater treatment method of high salinity high rigidity difficult degradation and system |
| CN111170554A (en) * | 2019-10-29 | 2020-05-19 | 光大环保技术研究院（南京）有限公司 | A processing apparatus for waste water of high organic matter of high salt |
| CN116621387A (en) * | 2023-06-30 | 2023-08-22 | 青岛水务集团有限公司 | Concentrated solution full-quantification treatment system and method |
| CN116621387B (en) * | 2023-06-30 | 2023-11-14 | 青岛水务集团有限公司 | Concentrated solution full-quantification treatment system and method |
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