CN215365294U - Zero liquid discharge processing system of pelletizing plant desulfurization waste water of high water recovery rate - Google Patents
Zero liquid discharge processing system of pelletizing plant desulfurization waste water of high water recovery rate Download PDFInfo
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- CN215365294U CN215365294U CN202120406787.7U CN202120406787U CN215365294U CN 215365294 U CN215365294 U CN 215365294U CN 202120406787 U CN202120406787 U CN 202120406787U CN 215365294 U CN215365294 U CN 215365294U
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Abstract
The utility model provides a zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate. The utility model comprises a pretreatment system, a tubular microfiltration system, a reverse osmosis system, an ion exchange membrane system, a multi-effect evaporation system and a steam water recovery system which are connected in sequence. The utility model improves the water utilization rate to the maximum through a thermal membrane coupling method on the premise of meeting the zero liquid discharge of the desulfurization wastewater of the pellet mill, achieves the aim of water saving and emission reduction, has reasonable process flow design, and saves the occupied area, investment and operating cost of a treatment device. The whole structure comprises a plurality of modularized structures, and the modularized design can be freely spliced according to the quality of inlet water and can be flexibly applied; the field workload is reduced, the civil construction period is shortened, and the construction period is shortened.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate.
Background
The desulfurization wastewater of the pellet mill is wastewater generated by a wet desulfurization process of the pellet mill, has the characteristics of high hardness, high suspended matters, high salt content, unstable water quality and water quantity, large fluctuation range, weak acidity and the like, is wastewater with high treatment difficulty in the pellet mill, and is an important ring for realizing zero emission in the pellet mill. China is in shortage of water resources, however, the demand of water resources is high due to economic development, and industrial water and domestic water pose great threats to the water resources of our country. Therefore, the reasonable utilization of water resources is particularly important, and the national department of hydraulic resources also puts higher requirements on the reasonable, effective and continuous utilization of the water resources. Therefore, the utility model of the desulfurization wastewater zero-liquid discharge treatment method with high water recovery rate is necessary.
The traditional desulfurization wastewater treatment system generally treats desulfurization wastewater through triple-box processes of dosing, precipitation, flocculation and the like, and supernatant is discharged out of a factory. With the improvement of the environmental protection requirement, in order to realize the zero discharge of the desulfurization wastewater of the pellet mill, treatment modes such as flue spraying, crystallization evaporation, membrane desalination and the like are added on the basis of the traditional desulfurization wastewater process, but the flue spraying reaction is difficult to control, dust removal equipment is easy to corrode, resource utilization is not facilitated, the direct thermal method is high in investment cost and energy consumption, scaling is easy, and continuous operation is not facilitated.
SUMMERY OF THE UTILITY MODEL
According to the technical problems, the utility model provides a zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate, which mainly utilizes modes such as pretreatment, tubular microfiltration and the like to effectively remove substances such as suspended matters, heavy metals, gypsum, colloids and the like in the desulfurization wastewater, utilizes reverse osmosis to carry out desalination treatment, utilizes an ion exchange membrane to further concentrate concentrated water, finally introduces the concentrated water into an evaporation system to crystallize into solid salt, and recovers water vapor formed by evaporation by using a steam-water separation membrane, thereby improving the water recovery utilization rate to the greatest extent on the premise of meeting the zero-liquid discharge environmental protection requirement of the pellet mill. The technical means adopted by the utility model are as follows:
a zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate, which comprises a pretreatment system, a tubular microfiltration system, a reverse osmosis system, an ion exchange membrane system, a multi-effect evaporation system and a steam-water recovery system which are connected in sequence,
the pretreatment system is used for removing suspended matters, heavy metals, hardness and part of colloids;
the tubular microfiltration system is used for removing suspended matters, colloids, organic macromolecules and microorganisms;
the reverse osmosis system is used for desalting;
the ion exchange membrane system is used for further concentrating reverse osmosis concentrated water;
the multi-effect evaporation system is used for evaporating and crystallizing concentrated water into solid salt;
the steam water recovery system is used for recovering the steam generated by evaporating the concentrated water;
the water inlet of the pretreatment system is used as the water inlet of the desulfurization wastewater, and the water outlet of the reverse osmosis produced water and steam water recovery system is used as the water outlet of the purified water.
Furthermore, the pretreatment system comprises a wastewater adjusting aeration tank and a triple box (a neutralization tank, a coagulation tank and a flocculation tank) which are sequentially connected, wherein the water outlet of the flocculation tank is connected with a clarification tank, the outlet of the clarification tank is connected with a pH adjusting tank, and the wastewater adjusting aeration tank is used for fully aerating the desulfurization wastewater and reducing the COD value of the wastewater in the tank; the neutralization tank is connected with a lime milk dosing device for adding lime milk into the neutralization tank; the coagulation box is connected with an organic sulfur dosing device used for adding organic sulfur into the coagulation box; the flocculation box is connected with a flocculant dosing device used for adding a flocculant into the flocculation box; the pH adjusting tank is connected with a hydrochloric acid dosing device used for adding hydrochloric acid into the pH adjusting tank, and a pH meter is further installed on the pH adjusting tank.
Furthermore, the bottom of the clarification tank is provided with a mud scraping device, and the clarification tank is also connected with a sludge dewatering machine through a sludge pump.
Further, the tubular microfiltration system comprises a tubular microfiltration membrane and a cleaning and dosing device.
Furthermore, the reverse osmosis system comprises a reverse osmosis membrane, a high-pressure pump and a filter, wherein a water outlet of the tubular microfiltration system is connected to the filter, and the filter is connected with the reverse osmosis membrane through the high-pressure pump.
Further, the multi-effect evaporation system comprises a multi-effect evaporator connected to a water outlet of the ion exchange membrane system, secondary steam generated by the last stage multi-effect evaporator enters the water recovery system for condensation, and the multi-effect evaporation system further comprises a centrifugal drying device used for carrying out centrifugal drying on high-salt mother liquor generated by evaporation so as to prepare solid salt.
According to the utility model, the water utilization rate is improved to the maximum through a thermal membrane coupling method on the premise of meeting the zero liquid discharge of the desulfurization wastewater of the pellet mill, so that the aims of water saving and emission reduction are achieved.
The utility model has the following advantages:
1. the membrane desalination process, the evaporative crystallization process and the steam-water recovery process are fully combined, and after the chemical examination analysis, the process calculation and the optimization, the process flow is reasonable in design, and the occupied area, the investment and the operating cost of a treatment device are saved.
2. The whole system process is mature and reliable, the technology can adapt to high-salinity wastewater of 15000-70000 mg/L, the water quality fluctuation is resisted, the effluent water quality is stable, the water yield of the system can reach more than 90%, and the technology is suitable for power plants in arid regions needing flue gas water recovery systems.
3. The whole structure comprises a plurality of modularized structures, and the modularized design can be freely spliced according to the quality of inlet water and can be flexibly applied; the field workload is reduced, the civil construction period is shortened, and the construction period is shortened.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall system of the present invention.
FIG. 2 is a schematic diagram of the pretreatment system of the present invention.
FIG. 3 is a schematic diagram of a reverse osmosis system according to the present invention.
FIG. 4 is a schematic diagram of the structure of an ion exchange membrane system of the present invention.
FIG. 5 is a schematic diagram of the water production process of the steam system of the present invention.
In the figure: 1. a pre-treatment system; 2. a tubular microfiltration system; 3. a reverse osmosis system; 4. an ion exchange membrane system; 5. a multi-effect evaporation system; 6. a steam water recovery system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the utility model discloses a zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate, which comprises a pretreatment system, a tubular microfiltration system, a reverse osmosis system, an ion exchange membrane system, a multi-effect evaporation system and a steam-water recovery system which are connected in sequence,
the pretreatment system 1 is used for removing suspended matters, heavy metals, hardness and part of colloids;
the tubular microfiltration system 2 is used for removing suspended matters, colloids, organic macromolecules and microorganisms;
the reverse osmosis system 3 is used for desalting;
the ion exchange membrane system 4 is used for further concentrating reverse osmosis concentrated water;
the multi-effect evaporation system 5 is used for evaporating and crystallizing concentrated water into solid salt;
the steam water recovery system 6 is used for recovering the steam generated by evaporating the concentrated water;
the water inlet of the pretreatment system is used as the water inlet of the desulfurization wastewater, and the water outlet of the reverse osmosis produced water and steam water recovery system is used as the water outlet of the purified water.
The regulation sedimentation tank plays the effect of balanced quality of water and the great suspended solid of sediment, creates suitable reaction condition for the follow-up processing technology link, pretreatment systems is including consecutive waste water regulation aeration tank, neutralization tank, coagulating tank and flocculation case, and the depositing reservoir is connected to the delivery port of flocculation case, and the exit linkage pH equalizing basin of depositing reservoir, waste water regulation aeration tank is used for carrying out abundant aeration to desulfurization waste water through arranging the aeration equipment at the bottom of the pool, reduces the COD value of waste water in the pond, later adopts the waste water elevator pump to carry waste water to neutralization tank, the neutralization tank is connected with the lime breast charge device who is used for adding the lime breast wherein. Because the wastewater is acidic, lime milk is added, the pH of the wastewater is adjusted to about 8.5-9.5, S042-, iron and part of heavy metals are precipitated, and simultaneously soda is added to soften the raw water. The coagulation box is connected with an organic sulfur dosing device used for adding organic sulfur (TMT-15) into the coagulation box, and heavy metal ions which cannot be precipitated by hydroxide are further precipitated. Meanwhile, coagulant FeClS04 is added into the coagulation tank to generate flocculate, and polymer polyelectrolyte is added into the pipeline before the effluent of the flocculation tank enters the settling tank to serve as coagulant aid, so that the flocculate becomes larger and is easier to settle, and can be settled and separated in the settling tank. The desulfurized wastewater automatically flows into a clarification tank from a flocculation tank, flocculates in the wastewater are deposited at the bottom of the clarification tank under the action of gravity, are concentrated into sludge, are removed by a sludge scraping device, and are conveyed to a sludge dewatering machine by a sludge pump to be dried and transported out; clear water then rises to the top and flows to the pH equalizing basin through the oxidation mixing arrangement automatically through annular triangle overflow weir, installs the pH meter on the pH equalizing basin, adjusts pH to between 6 ~ 9 through adding hydrochloric acid.
The desulfurization wastewater is homogenized and uniformly regulated in a pretreatment system through a regulating tank, suspended matters, heavy metals, hardness and partial colloids are removed in a triple box and a clarification tank through pretreatment modes such as dosing, coagulating sedimentation and the like, and sludge generated by sedimentation is solidified by a dehydrator and then transported outside.
After being pretreated, the wastewater enters a tubular microfiltration system, as shown in fig. 2, wherein the tubular microfiltration system comprises a tubular microfiltration membrane and a cleaning and dosing device. Suspended matters, colloid, organic macromolecules, microorganisms and the like in the inlet water are removed in a membrane filtration mode, so that a subsequent reverse osmosis system can normally operate, and scaling and fouling blockage are prevented.
After the wastewater enters the intermediate water tank, further desalting treatment is needed, but because the hardness, suspended matters, colloidal substances and the like in the wastewater do not meet the reverse osmosis water inlet standard, pretreatment before membrane is needed. Suspended matters in the wastewater have higher viscosity, and the hollow fiber membrane filaments are easy to be polluted and blocked, so the tubular microfiltration is a more reasonable membrane pretreatment process. The tubular microfiltration is a composite membrane tube formed by combining a porous membrane made of ultra-high molecular polymer PVDF and a support tube, can work under higher operating pressure and obtain extremely high suspended matter removal efficiency and membrane flux, and can separate suspended matters, colloids, organic macromolecules, microorganisms and the like in inlet water by combining a micro-flocculation technology so that a subsequent reverse osmosis system can normally operate to prevent scaling and fouling.
The microfiltration product water enters a reverse osmosis system, as shown in fig. 3, the reverse osmosis system comprises a reverse osmosis membrane, a high-pressure pump and a filter, the water outlet of the tubular microfiltration system is connected to the filter, and the filter is connected with the reverse osmosis membrane through the high-pressure pump. Under the action of the high-pressure pump, pressure greater than osmotic pressure is applied to the membrane, water can perform reverse osmosis against the flow direction of natural osmosis, and the water which is permeated at the low-pressure side of the membrane is produced water which can be reused as process water; and obtaining a concentrated solution at the high-pressure side, namely reverse osmosis concentrated water.
As shown in fig. 4, the reverse osmosis concentrated water enters an ion exchange membrane system (the main equipment is an ion exchange membrane block) for further concentration, so that the evaporation capacity of subsequent multi-effect evaporation is reduced, the effect of hardness removal is achieved, the structural risk of the multi-effect evaporator is reduced, and the continuous operation of the multi-effect evaporation system is ensured.
The ion exchange membrane system is a process that charged ions in a solution selectively pass through an ion exchange membrane under the action of an electric field. The method is mainly used for separating the electrolyte in the solution. Saline water is introduced into the desalting chamber, a power supply is connected, positive ions in the solution move to the positive membrane in the direction of the cathode under the action of an electric field, and the positive ions penetrate through the membrane under the action of opposite attraction of groups with negative charges on the membrane and enter the concentration chamber on the right side. The negatively charged anions move to the cathode membrane in the direction of the anode and are attracted by the opposite phase of the positively charged groups on the membrane, pass through the membrane and enter the left concentrating compartment. Sodium chloride in the brine of the desalting chamber is continuously removed to obtain fresh water, and the sodium chloride is concentrated in the concentrating chamber.
Concentrated water after concentration and decrement enters a multi-effect evaporation system (the main equipment is an evaporator and a centrifugal crystallizer), water vapor and high-salt mother liquor are generated through triple-effect evaporation, and the high-salt mother liquor is centrifugally dried through the centrifugal crystallizer to prepare solid salt for outward transportation or resource utilization.
As shown in fig. 5, the evaporation process is a process of boiling and evaporating the salt-containing wastewater, and then recovering and condensing the vapor into fresh water. The evaporation process technology has no special requirements on salt substances in the salt-containing wastewater, can realize the separation of the salt substances, and is commonly used for the treatment of high-salinity wastewater. The common processing modes of evaporation of the strong brine are many, and the multiple-effect evaporation mode is more economical and reasonable due to the fact that the air source is sufficient in the pellet factory. The salt-containing wastewater is subjected to multiple-effect evaporation, the salt-containing wastewater is heated to a boiling point under corresponding pressure by using raw steam, then the salt-containing wastewater enters a first-effect evaporator, secondary steam is flashed out by the evaporator to serve as a heat source for next-effect evaporation, and the process is repeated until the secondary steam generated by a last effect enters a water recovery system for condensation. The distilled water produced in the evaporation process has good water quality and can be used as the process water of the pellet mill for continuous use. The high-salt mother liquor generated by evaporation is centrifugally dried to prepare solid salt.
The water vapor generated in the evaporation process is collected by arranging selective permeation films through a steam water recovery system (main equipment is a fan, a water capture module and a condenser), and the films adopt hollow fiber film filaments with water molecule selective coatings, only allow water molecules to pass through and have an interception effect on other molecules, so that only the water molecules are present in the fibers. Compared with the common condensation method, the method saves space and has better water quality, can be used as produced water, does not need to return to the front end of the system for retreatment, and reduces the equipment investment scale.
Steam generated in the evaporation process passes through the water trapping device before being discharged into the atmosphere, part of water molecules pass through the filtering membrane under the action of osmotic pressure, the residual non-condensable gas is continuously discharged, the water condensed by the filtering device can be recycled, and the osmotic pressure of the filtering membrane comes from vacuum caused by the vacuum device.
Condensation of water molecules is achieved by a vacuum system comprising a cooler, a water recovery unit and a vacuum pump. Power plants requiring flue gas water recovery systems are mostly located in arid areas, so air-cooled condensers are selected to create necessary water concentration. The vacuum system consists of an air-cooled condenser and an impeller rotary vacuum pump.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A zero-liquid discharge treatment system for desulfurization wastewater of a pellet mill with high water recovery rate is characterized by comprising a pretreatment system, a tubular microfiltration system, a reverse osmosis system, an ion exchange membrane system, a multi-effect evaporation system and a steam-water recovery system which are sequentially connected,
the pretreatment system is used for removing suspended matters, heavy metals, hardness and part of colloids;
the tubular microfiltration system is used for removing suspended matters, colloids, organic macromolecules and microorganisms;
the reverse osmosis system is used for desalting;
the ion exchange membrane system is used for further concentrating reverse osmosis concentrated water;
the multi-effect evaporation system is used for evaporating and crystallizing concentrated water into solid salt;
the steam water recovery system is used for recovering the steam generated by evaporating the concentrated water;
the water inlet of the pretreatment system is used as the water inlet of the desulfurization wastewater, and the water outlet of the reverse osmosis produced water and steam water recovery system is used as the water outlet of the purified water.
2. The zero-liquid discharge treatment system for desulfurization wastewater of pellet mill with high water recovery rate as claimed in claim 1, wherein the pretreatment system comprises a wastewater adjusting aeration tank, a neutralization tank, a coagulation tank and a flocculation tank which are connected in sequence, a water outlet of the flocculation tank is connected with a clarification tank, an outlet of the clarification tank is connected with a pH adjusting tank, and the wastewater adjusting aeration tank is used for fully aerating desulfurization wastewater to reduce COD value of wastewater in the tank; the neutralization tank is connected with a lime milk dosing device for adding lime milk into the neutralization tank; the coagulation box is connected with an organic sulfur dosing device used for adding organic sulfur into the coagulation box; the flocculation box is connected with a flocculant dosing device used for adding a flocculant into the flocculation box; the pH adjusting tank is connected with a hydrochloric acid dosing device used for adding hydrochloric acid into the pH adjusting tank, and a pH meter is further installed on the pH adjusting tank.
3. The zero-liquid discharge treatment system for desulfurization wastewater of pellet mill with high water recovery rate as claimed in claim 2, wherein the bottom of the clarification tank is provided with a mud scraping device, and the clarification tank is further connected with a sludge dewatering machine through a sludge pump.
4. The zero-liquid discharge treatment system for desulfurization wastewater of pellet mill with high water recovery rate of claim 1, wherein the tubular microfiltration system comprises a tubular microfiltration membrane and a cleaning and dosing device.
5. The zero-liquid discharge treatment system for desulfurization wastewater of pellet mill with high water recovery rate of claim 1, wherein the reverse osmosis system comprises a reverse osmosis membrane, a high-pressure pump and a filter, the water outlet of the tubular microfiltration system is connected to the filter, and the filter is connected with the reverse osmosis membrane through the high-pressure pump.
6. The zero-liquid discharge treatment system for desulfurization wastewater of pellet mill with high water recovery rate as recited in claim 1, wherein the multi-effect evaporation system comprises a multi-effect evaporator connected to the water outlet of the ion exchange membrane system, the secondary steam generated by the last multi-effect evaporator enters the water recovery system for condensation, and the multi-effect evaporation system further comprises a centrifugal drying device for centrifugally drying the high-salt mother liquid generated by evaporation to prepare solid salt.
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| CN202120406787.7U CN215365294U (en) | 2021-02-23 | 2021-02-23 | Zero liquid discharge processing system of pelletizing plant desulfurization waste water of high water recovery rate |
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| CN202120406787.7U CN215365294U (en) | 2021-02-23 | 2021-02-23 | Zero liquid discharge processing system of pelletizing plant desulfurization waste water of high water recovery rate |
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