CN103708666A - Method and equipment for desulfurization waste water reuse and zero discharge treatment - Google Patents
Method and equipment for desulfurization waste water reuse and zero discharge treatment Download PDFInfo
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- CN103708666A CN103708666A CN201310702040.6A CN201310702040A CN103708666A CN 103708666 A CN103708666 A CN 103708666A CN 201310702040 A CN201310702040 A CN 201310702040A CN 103708666 A CN103708666 A CN 103708666A
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Abstract
The invention relates to a method and equipment for desulfurization waste water reuse and zero discharge treatment. The method comprises the steps of pretreatment, chemical reaction treatment, separation treatment, purification and filtration treatment, and evaporative crystallization treatment, thus obtaining purified water and salt for reuse. The equipment comprises a pretreatment settling device, a reaction device, a circulating device, a booster pump, a separation host machine, a filter, a reverse osmosis host machine and an evaporating crystallizer. The method and the equipment disclosed by the invention have outstanding advantages that suspended matters, heavy metal ions, hard ions, silicon ions and chemical oxygen demand (COD) removal rate are removed, and simultaneously partial pollutant is converted into a solid state from an ionic state, so as to separate the pollutant from the wastewater, thus reducing reverse osmosis membrane scaling, silica scale pollution and biological pollution and stopping secondary pollution; the method and the equipment can realize emission of the wastewater on standard firstly, recycle the wastewater with high recovery rate secondly, and relieve scaling and fouling of the evaporating crystallizer, increase heat exchange effect and reduce operation cost thirdly; and the entire equipment is small in occupied space, compact in structure, simple to operate and low in operation cost.
Description
Technical field
The present invention relates to desulfurization wastewater reuse and Zero discharge treatment method and equipment, belong to the reuse of tubular membrane system and zero release desulfurization wastewater processing technology field.
background technology:
Existingly for desulfurization wastewater treatment technology, have the following disadvantages:
1, wet process of FGD is that a kind of maturation, efficient sulfur removal technology are processed in sulphur topsoil, is widely used in various flue gas desulfurization (FGD) units; But wet desulphurization meeting produces desulfurization wastewater, contains a large amount of suspended substances, calcium magnesium hardness, activated silica, heavy metal, COD, high salt amount and other particular matters in this part waste water; Present stage, desulfurization wastewater was to discharge after simple process substantially, and waste water resource so mainly brings very large impact to environment; So advanced treatment further reuse desulfurization wastewater, until wastewater zero discharge is a kind of trend that desulfurization wastewater is processed, be also a technical barrier simultaneously.
2, the existing technical study of processing about desulfurization wastewater, there are some problems in method and principle:
In China Patent No., be 200610166002 < < flue gas desulfurization waste-water treatment process and system and device > >, and China Patent No. is 201110076844 < < zero emission treatment of desulfured waste waters and system > >, also having China Patent No. is the prior aries such as 201110204147 < < method for treating desulfurized wastewater > >, at relevant desulfurization wastewater, recycle in research, they are at common feature: in desulfurization wastewater, add medicament, suspended substance and part heavy metal precipitation are separated, then by the water discharge of processing, or the water after processing is reached to zero release by atomisation unit and electrostatic precipitator evaporate to dryness.The shortcoming of above-mentioned technical matters is: 1) water does not carry out reuse; 2) desulfurization wastewater discharging after simple process, wherein saltiness and other pollutent, as heavy metal ion, calcium magnesium hardness ion, silicon, COD and other pollution substances are all discharged in environment, cause the pollution of new mode to environment.
Summary of the invention
The object of the invention is, overcome the shortcoming of prior art, a kind of desulfurization wastewater reuse and Zero discharge treatment method and equipment are provided, improve the clearance that comprises heavy metal ion, hardness ions, silicon ion and COD; Reduce reverse osmosis membrane fouling, reduce silicon dirt and pollute and biotic pollution, blocking-up is polluted for the second time; The high desulfurization wastewater of recycling, finally reaches zero release, protection of the environment; And whole set equipment takes up an area less, close structure, simple to operate, working cost is low.
The technical scheme of a kind of desulfurization wastewater reuse of the present invention and Zero discharge treatment method is:
Desulfurization wastewater reuse and Zero discharge treatment method, comprise the steps:
A, pre-treatment: by desulfurization wastewater dosing clarification, make suspended substance flocculation form a team, precipitate, and isolate pretreated waste water;
B, chemical reaction handling: will isolate pretreated waste water dosing and carry out chemical reaction, and make the ionic forms pollution substance reaction generation floc particle in waste water suspend in water and make waste water softening, and obtain the waste water of chemical reaction handling;
C, separating treatment: the solid particulate in the waste water of chemical reaction handling is separated, and wherein: a road is delivered to sludge press filtration by the waste water with solid particulate and processed, and discharges solids, another road is by the waste water output purification filtering of separating treatment;
D, purification filtering are processed: with strainer and reverse osmosis main frame, the waste water of separating treatment is carried out to purification filtering processing, obtain purifying filtered water;
E, evaporative crystallization are processed: with evaporative crystallizer, purifying filtered water is carried out to evaporative crystallization and process also apportion discharge purifying waste water and salt for reuse.
Further scheme is:
Described desulfurization wastewater reuse and Zero discharge treatment method, in described sludge press filtration handling procedure, press filtration waste water is out sent into chemical reaction handling B step.
Described desulfurization wastewater reuse and Zero discharge treatment method, in described A step preprocessing process, suspended substance flocculation drains in sludge press filtration handling procedure and processes after forming a team, precipitating.
The not standby skill scheme of a kind of desulfurization wastewater reuse for desulfurization wastewater reuse of the present invention and Zero discharge treatment method and zero discharge treatment is: this equipment is installed and comprised by water (flow) direction order: with pre-treatment clarifying plant, reaction unit, circulation device, separation host, strainer, reverse osmosis main frame and the evaporative crystallizer of desulfurization wastewater UNICOM; Described pre-treatment clarifying plant comprises doser and settler, and the throw out relief outlet of this settler is connected with sludge filter press import, and the pretreated wastewater outlet of settler is connected with the import of the chemical reactor of reaction unit; Chemical reactor import is also connected with sludge filter press press filtration wastewater outlet; Each chemical reactor has 1 doser at least; Described separation host is tubular type mould separation host, and its import is connected with circulation device by topping-up pump, and this circulation device import is connected with chemical reactor outlet, and its throw out outlet is connected with sludge filter press import by sludge pump; Described separation host is connected with strainer by lift pump; Strainer is connected with reverse osmosis main frame by high-pressure pump, and reverse osmosis main frame is connected with evaporative crystallizer by boosting pump, and this evaporative crystallizer is respectively arranged with purifies waste water and the relief outlet of salt.
Described desulfurization wastewater reuse and zero discharge treatment do not have standby further scheme to be:
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and the film silk of its separation host is that the internal diameter that sintering forms is more than or equal to 10 millimeters, is less than or equal to the filtering membrane silk of 105 millimeters.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and the film silk internal diameter of its separation host is the filtering membrane silk of 12.5 millimeters.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and the film silk internal diameter of its separation host is the filtering membrane silk of 25.4 millimeters.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and the film silk internal diameter of its separation host is the filtering membrane silk of 100 millimeters.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and its pre-treatment clarifying plant is comprised of 1 doser and 1 settler.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and its chemical reactor is by least 1 chemical reaction pond, and each chemical reaction pond has at least 1 doser to form.
Described desulfurization wastewater reuse and zero discharge treatment are not standby, and its separation host film is selected by following technical indicator: film surface velocity is 1-10 meter per seconds; Treatable solids concn with the waste water weight ratio of solid weight and chemical reaction handling, count: 0.02%-15%.
Ultimate principle of the present invention and major technique effect are described as follows:
1, desulfurization wastewater reuse of the present invention and Zero discharge treatment method are that the hardness ionses such as suspended substance, heavy metal ion, calcium magnesium were removed before entering dense water reverse osmosis; Enter again reverse osmosis main frame; Like this, the tendency of heavy metal contamination and calcium magnesium scale has just been avoided on reverse osmosis main frame film surface; Reduce simultaneously enter evaporative crystallizer the water yield, avoid its dirty bridging dirt, finally reach liquid zero emission, high-quality the purifying waste water of reuse simultaneously.
2, the exclusive feature of film silk structure of tubular membrane separation host 4 of the present invention, makes tubular membrane separation host and method of work thereof greatly reduce the floor space of reaction tank; And its large cross-flow technique of selecting, guaranteed cleaning and strainability of film silk surface.
3, the tubular membrane separation host in the present invention with it fore portion form together the removal of heavy metal ion, hardness ions, silicon, COD and other pollutent with separated, except small part mud, do not form secondary wastewater, its rate of recovery reaches 99.4%.
4, the present invention can upgrade to wastewater zero discharge by the simple process discharge of traditional desulfurization wastewater.
In sum, principle of the present invention is to enter hardness ions, silicon, COD and other contaminant removal such as heavy metal ion before dense water reverse osmosis, calcium magnesium, protected dense water reverse osmosis main frame, reverse osmosis main frame can be moved under high-recovery, reduce the water yield and the pollutent that enter evaporative crystallizer, improve the salt concentration in water simultaneously, improve the operation stability of evaporative crystallizer; And due to its tubular membrane solid-liquid separation technique and feature, also have, due to chemical reaction, use medicament still less, produce mud still less.
Accompanying drawing explanation
Fig. 1 is the program schematic diagram of desulfurization wastewater reuse of the present invention and Zero discharge treatment method.
Fig. 2 is desulfurization wastewater reuse of the present invention and zero discharge treatment equipment schematic diagram.
In figure, the name of each Reference numeral is called: 1-pre-treatment clarifying plant; 1.1-doser; 1.2-settler; 2.1-chemical reactor; 2.11-the 1st chemical reactor; 2.12-the 2nd chemical reactor; 2.2-doser; 3-circulation device; 4-topping-up pump; 5-separation host; 8-strainer; 10-reverse osmosis main frame; 12-evaporative crystallizer; 6-water tank; 7-lift pump; 9-high-pressure pump; The dense water boosting pump of 11-; 13,15-sludge pump; 14-sludge filter press; 16-desulfurization wastewater; 17-purifies waste water.
Embodiment
To a kind of desulfurization wastewater reuse of the present invention and Zero discharge treatment method and equipment, be described further as follows in conjunction with the accompanying drawings and embodiments:
embodiment 1:as shown in Figure 1, be 1 embodiment of a kind of desulfurization wastewater reuse of the present invention and Zero discharge treatment method.Comprise the steps:
A, pre-treatment: by desulfurization wastewater dosing clarification, make suspended substance flocculation form a team, precipitate, and isolate pretreated waste water;
B, chemical reaction handling: will isolate pretreated waste water dosing and carry out chemical reaction, and make the ionic forms pollution substance reaction generation floc particle in waste water suspend in water and make waste water softening, and obtain the waste water of chemical reaction handling;
C, separating treatment: the solid particulate in the waste water of chemical reaction handling is separated, and wherein: a road is delivered to sludge press filtration by the waste water with solid particulate and processed, and discharges solids, another road is by the waste water output purification filtering of separating treatment;
D, purification filtering are processed: with strainer and reverse osmosis main frame, the waste water of separating treatment is carried out to purification filtering processing, obtain purifying filtered water;
E, evaporative crystallization are processed: with evaporative crystallizer, purifying filtered water is carried out to evaporative crystallization and process also apportion discharge purifying waste water and salt for reuse;
In described sludge press filtration handling procedure, press filtration waste water is out sent into chemical reaction handling B step;
In described A step preprocessing process, suspended substance flocculation drains in sludge press filtration handling procedure and processes after forming a team, precipitating.
embodiment 2:as shown in Figure 2, be the specific equipment embodiment for a kind of desulfurization wastewater reuse of the present invention and Zero discharge treatment method.This equipment is installed and is comprised by water (flow) direction order: with pre-treatment clarifying plant 1, reaction unit 2, circulation device 3, separation host 5, strainer 8, reverse osmosis main frame 10 and the evaporative crystallizer 12 of desulfurization wastewater 16 UNICOMs; Described pre-treatment clarifying plant 1 comprises doser 1.1 and settler 1.2, be used for the suspended substance flocculate and clarify of desulfurization wastewater 16, the throw out relief outlet of this settler 1.2 is connected with sludge filter press 14 imports, and the pretreated wastewater outlet of settler 1.2 is connected with the import of the chemical reactor 2.1 of reaction unit 2; Chemical reactor 2.1 imports are also connected with sludge filter press 14 press filtration wastewater outlets; Each chemical reactor 2.1 has 1 doser 2.2 at least, reaction unit 2 is for by the pollution substance of the ionic state of original waste water, wherein contain the part in heavy metal ion, silicon ion, calcium, magnesium class hardness ions, fluorine, COD, also can suspend in water and soften original waste water for total material reaction generates floc particle; Described separation host 5 is tubular type mould separation host, its import is connected with circulation device 3 by topping-up pump 4, these circulation device 3 imports are connected with chemical reactor 2.1 outlets, the outlet of its throw out is connected with sludge filter press 14 imports by sludge pump 13, and separation host 5 is back to circulation device 3 and exports the waste water of separating treatment for the solid particulate of reaction unit 2 chemical precipitations reaction generations being separated with concentrated liquid; Described separation host 5 is connected with strainer 8 by lift pump 7, for the waste water lifting of isolating the separating treatment after solid through separation host 5 is made to filtration treatment to strainer 8, between separation host 5 lift pumps 7, can there is one for storing the water tank 6 of the waste water of separating treatment; Strainer 8 is connected with reverse osmosis main frame 10 by high-pressure pump 9, for being delivered to reverse osmosis main frame 10, the water of filtration purifies, reverse osmosis main frame 10 is connected with evaporative crystallizer 12 by boosting pump 11, this evaporative crystallizer 12 is respectively arranged with purifies waste water and the relief outlet of salt, for the dense water of reverse osmosis main frame 10 is delivered to evaporative crystallizer 12 carry out evaporative crystallization process after the output reuse of purifying waste water, salinity reclaims after solidifying, to reach the object of zero discharge treatment.
embodiment 3:further embodiment on embodiment 2 bases, as different from Example 2: the film silk of described separation host 5 is that the internal diameter that sintering forms is more than or equal to 10 millimeters, is less than or equal to the filtering membrane silk of 105 millimeters.Chemical reactor 2.1 is by least 1 chemical reaction pond, and each chemical reaction pond has at least 1 doser 2.2 to form.Separation host 5 films are selected by following technical indicator: film surface velocity is 1-10 meter per seconds; Treatable solids concn with the waste water weight ratio of solid weight and chemical reaction handling, count: 0.02%-15%.
embodiment 4:further embodiment on embodiment 2 bases, as different from Example 2: the film silk internal diameter of described separation host 5 is the filtering membrane silk of 12.5 millimeters.Filtering membrane wire material is selected from corrosion resistant PVDF, can also be PE or stainless steel.As shown in Figure 2, chemical reactor 2.1 is comprised of 2 chemical reaction ponds and 3 dosers 2.2, so that use, can also be 2 dosers.Circulation device 3 has 2 discharge outlets, and one of them discharge outlet is by being connected sludge filter press 14 with sludge pump 13, and another discharge outlet is connected with topping-up pump 4, can also have the leakage hole of maintenance for emergency use.
embodiment 5:further embodiment on embodiment 2 bases, as different from Example 2: the film silk internal diameter of described separation host 5 is the filtering membrane silk of 25.4 millimeters.Described filtering membrane silk is selected from corrosion resistant PE.Separation host 5 films are selected by following technical indicator: film surface velocity is 1-8 meter per seconds; The waste water weight ratio of treatable solids concn after with solid weight and chemical treatment count 0.02%-10%.Chemical reactor 2.1 is comprised of a chemical reaction pond and a doser 2.2.
embodiment 6:further embodiment on embodiment 2 bases, as different from Example 2: the film silk internal diameter of described separation host 5 is the filtering membrane silk of 100 millimeters.
embodiment 7:further embodiment on embodiment 2 bases, as different from Example 2: its described pre-treatment clarifying plant 1 is comprised of 1 doser 1.1 and 1 settler 1.2.The film silk internal diameter of separation host 5 equals 50 millimeters; Filtering membrane silk material is selected from corrosion resistant stainless steel.Described separation host 5 films are selected by following technical indicator: film surface velocity is 2-10 meter per seconds; The waste water weight ratio of treatable solids concn after with solid weight and chemical treatment count 0.05%-15%.
The claims in the present invention protection domain is not limited to above-described embodiment.
Claims (11)
1. desulfurization wastewater reuse and a Zero discharge treatment method, is characterized in that, comprises the steps:
A, pre-treatment: by desulfurization wastewater dosing clarification, make suspended substance flocculation form a team, precipitate, and isolate pretreated waste water;
B, chemical reaction handling: will isolate pretreated waste water dosing and carry out chemical reaction, and make the ionic forms pollution substance reaction generation floc particle in waste water suspend in water and make waste water softening, and obtain the waste water of chemical reaction handling;
C, separating treatment: the solid particulate in the waste water of chemical reaction handling is separated, and wherein: a road is delivered to sludge press filtration by the waste water with solid particulate and processed, and discharges solids, another road is by the waste water output purification filtering of separating treatment;
D, purification filtering are processed: with strainer and reverse osmosis main frame, the waste water of separating treatment is carried out to purification filtering processing, obtain purifying filtered water;
E, evaporative crystallization are processed: with evaporative crystallizer, purifying filtered water is carried out to evaporative crystallization and process also apportion discharge purifying waste water and salt for reuse.
2. desulfurization wastewater reuse according to claim 1 and Zero discharge treatment method, is characterized in that, in described sludge press filtration handling procedure, press filtration waste water is out sent into chemical reaction handling B step.
3. desulfurization wastewater reuse according to claim 1 and Zero discharge treatment method, is characterized in that, in described A step preprocessing process, suspended substance flocculation drains in sludge press filtration handling procedure and processes after forming a team, precipitating.
4. the desulfurization wastewater reuse for method described in claim 1 and zero discharge treatment are not standby, it is characterized in that, by water (flow) direction order, install and comprise: with pre-treatment clarifying plant (1), reaction unit (2), circulation device (3), separation host (5), strainer (8), reverse osmosis main frame (10) and the evaporative crystallizer (12) of desulfurization wastewater (16) UNICOM; Described pre-treatment clarifying plant (1) comprises doser (1.1) and settler (1.2), the throw out relief outlet of this settler (1.2) is connected with sludge filter press (14) import, and the pretreated wastewater outlet of settler (1.2) is connected with the import of the chemical reactor (2.1) of reaction unit (2); Chemical reactor (2.1) import is also connected with sludge filter press (14) press filtration wastewater outlet; Each chemical reactor (2.1) has 1 doser (2.2) at least; Described separation host (5) is tubular type mould separation host, its import is connected with circulation device (3) by topping-up pump (4), this circulation device (3) import is connected with chemical reactor (2.1) outlet, and its throw out outlet is connected with sludge filter press (14) import by sludge pump (13); Described separation host (5) is connected with strainer (8) by lift pump (7); Strainer (8) is connected with reverse osmosis main frame (10) by high-pressure pump (9), and reverse osmosis main frame (10) passes through boosting pump (11) and is connected with evaporative crystallizer (12), and this evaporative crystallizer (12) is respectively arranged with purifies waste water and the relief outlet of salt.
5. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, the film silk of described separation host (5) is that the internal diameter that sintering forms is more than or equal to 10 millimeters, is less than or equal to the filtering membrane silk of 105 millimeters.
6. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, the film silk internal diameter of described separation host (5) is the filtering membrane silk of 12.5 millimeters.
7. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, the film silk internal diameter of described separation host (5) is the filtering membrane silk of 25.4 millimeters.
8. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, the film silk internal diameter of described separation host (5) is the filtering membrane silk of 100 millimeters.
9. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, described pre-treatment clarifying plant (1) is comprised of 1 doser (1.1) and 1 settler (1.2).
10. desulfurization wastewater reuse according to claim 4 and zero discharge treatment are not standby, it is characterized in that, described chemical reactor (2.1) is by least 1 chemical reaction pond, and each chemical reaction pond has at least 1 doser (2.2) to form.
11. desulfurization wastewater reuses according to claim 4 and zero discharge treatment are not standby, it is characterized in that, described separation host (5) film is selected by following technical indicator: film surface velocity is 1-10 meter per seconds; Treatable solids concn with the waste water weight ratio of solid weight and chemical reaction handling, count: 0.02%-15%.
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| CN104150669A (en) * | 2014-08-22 | 2014-11-19 | 国家电网公司 | Thermal power plant desulphurization wastewater purification system and purification method |
| CN104803535A (en) * | 2015-05-06 | 2015-07-29 | 广州新普利节能环保科技有限公司 | Recycling system and recycling process for recycling salt from desulfurization waste water |
| CN104829033A (en) * | 2015-05-29 | 2015-08-12 | 北京科泰兴达高新技术有限公司 | Method of recycling reverse osmosis concentrate |
| CN105174580A (en) * | 2015-08-25 | 2015-12-23 | 天津市华通寰昊水务科技有限公司 | Desulphurization waste-water zero discharge processing system and technology |
| CN105330081A (en) * | 2015-12-01 | 2016-02-17 | 上海龙净环保科技工程有限公司 | Method and system suitable for zero discharge of desulfurization waste water of power plant |
| CN105712559A (en) * | 2016-03-30 | 2016-06-29 | 北京朗新明环保科技有限公司南京分公司 | Membrane treatment system and technology for desulfurization wastewater |
| CN107215980A (en) * | 2017-06-14 | 2017-09-29 | 大唐环境产业集团股份有限公司 | The device and method of novel desulphurization wastewater treatment |
| CN107572713A (en) * | 2017-09-15 | 2018-01-12 | 许继联华国际环境工程有限责任公司 | A kind of zero emission of wastewater treatment device and method |
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Application publication date: 20140409 |