A resin waste liquid treatment system and treatment method

Abstract

The present disclosure relates to a resin waste liquid treatment system and treatment method, the treatment system comprising a resin filter, a resin waste liquid tank, a resin waste liquid delivery pump, a coal-containing wastewater collection tank, a coal-containing wastewater discharge pump, and a coagulation and clarification unit; the coagulation and clarification unit comprising a wastewater cyclone, a flocculant and coagulant dosing device, a dosing pump, a coal-containing wastewater clarifier, and a resin waste liquid clarifier. The present disclosure, by adding a coagulation and clarification unit, utilizes a wastewater cyclone to effectively separate large particles of adsorbent coal from fine mud that inhibits resin adsorption in the coal-containing wastewater, thereby separating and treating the resin waste liquid and the coal-containing wastewater, making full use of the adsorption properties of large particles of coal in the coal mud, greatly improving the treatment efficiency of the resin waste liquid and the coal-containing water, reducing the consumption of flocculants and coagulants, achieving harmless treatment of the backwash liquid of the powdered resin filter, and reducing treatment costs.

Description

Technical Field

[0001] The present disclosure relates to the fields of environmental protection and chemistry of thermal power plants, and in particular to a system and method for treating resin waste liquid. Background Art

[0002] Coal-fired power plants that use powdered resin-coated filters for condensate polishing often produce wastewater containing a certain amount of resin powder and fiber powder during regeneration and backwashing. These wastewaters are fibrous or powdery, insoluble in water and common solvents, and chemically stable. Large-particle resin powders have high mechanical strength and density, allowing them to settle naturally. However, fiber powder and small-particle resin powders have a density similar to that of water and exhibit Brownian motion in water, resulting in poor natural settling. Even with the addition of flocculants and coagulants, these small-particle resin powders exhibit poor settling effects. Furthermore, these organic-containing wastewaters cannot be discharged directly, placing significant environmental pressure on thermal power plants.

[0003] Therefore, it is necessary to design and develop a low-cost and harmless resin waste liquid treatment system and method. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a resin waste liquid treatment system and treatment method, which can achieve harmless treatment of powder resin filter backwash liquid, reduce treatment costs, and improve backwash water utilization and treatment efficiency.

[0005] To achieve the above-mentioned object, the present disclosure provides a resin waste liquid treatment system in a first aspect, the system comprising a resin filter, a resin waste liquid tank, a resin waste liquid delivery pump, a coal-containing waste water collection tank, a coal-containing waste water discharge pump, and a coagulation and clarification unit;

[0006] The coagulation and clarification unit comprises a wastewater cyclone, a flocculant and coagulant dosing device, a dosing pump, a coal-containing wastewater clarifier and a resin waste liquid clarifier.

[0007] Optionally, the resin waste liquid pool is formed in a wedge shape; the resin waste liquid pool is installed with a liquid level meter; a first outlet is provided at the bottom of the resin waste liquid pool, the first outlet is connected to the inlet of the resin waste liquid delivery pump, and the outlet of the resin waste liquid delivery pump is connected to the resin waste liquid clarification tank.

[0008] Optionally, a second outlet is provided at the bottom of the coal-containing wastewater collection tank, the second outlet is connected to the inlet of the coal-containing wastewater discharge pump, and the outlet of the coal-containing wastewater discharge pump is connected to the wastewater cyclone.

[0009] Optionally, the top of the wastewater cyclone is connected to the coal-containing wastewater clarifier, and the bottom of the wastewater cyclone is connected to the resin waste liquid clarifier.

[0010] Optionally, the outlet of the dosing pump is communicated with the coal-containing wastewater clarifier and the resin waste liquid clarifier.

[0011] Optionally, the treatment system further comprises a coal sludge filter press and recovery device, a coal-containing wastewater sludge pump, and a resin waste liquid sludge pump;

[0012] The inlet of the coal-containing wastewater sludge pump is connected to the bottom of the coal-containing wastewater clarifier, and the outlet of the coal-containing wastewater sludge pump is connected to the coal slime filter press and recovery device; the inlet of the resin waste liquid sludge pump is connected to the bottom of the resin waste liquid clarifier, and the outlet of the resin waste liquid sludge pump is connected to the coal slime filter press and recovery device.

[0013] The second aspect of the present disclosure provides a method for treating resin waste liquid using the treatment system described in the first aspect of the present disclosure, the treatment method comprising:

[0014] (1) After the backwash waste liquid of the resin filter enters the resin waste liquid tank, it is separated into layers after standing. The upper layer is the supernatant liquid, and the lower layer is the waste liquid containing fiber powder and resin powder. The supernatant liquid overflows into the circulating water system, and the waste liquid containing fiber powder and resin powder is transported to the resin waste liquid clarification tank through the resin waste liquid delivery pump.

[0015] (2) The coal-containing wastewater is collected into the coal-containing wastewater collection pool through a pipe, and then transported to the wastewater cyclone through a coal-containing wastewater discharge pump. The wastewater cyclone performs cyclone separation and desliming on the coal-containing wastewater. The separated mud minerals are enriched in the cyclone. The separated large coal particles enter the resin waste liquid clarification pool through the bottom flow. The deslimed coal-containing wastewater is obtained in the wastewater cyclone;

[0016] (3) The desludging coal-containing wastewater flows into the coal-containing wastewater clarifier through overflow, and then undergoes flocculation by adding chemicals; the large coal-containing particles enter the resin waste liquid clarifier, and are mixed with the waste liquid containing fiber powder and resin powder, and then undergoes flocculation by adding chemicals;

[0017] (4) The flocculant and coagulant dosing device adds the flocculant and coagulant into the coal-containing wastewater clarifier and the resin waste liquid clarifier respectively through a dosing pump to perform flocculation and sedimentation.

[0018] Optionally, the treatment method further comprises connecting the bottom of the coal-containing wastewater clarifier to a coal-containing wastewater sludge pump, and the coal-containing wastewater sludge pump transports the coal-containing wastewater sludge after flocculation and precipitation to a coal sludge filter press and recovery device.

[0019] Optionally, the treatment method further comprises connecting the bottom of the resin waste liquid clarifier tank to a resin waste liquid sludge pump, and the resin waste liquid sludge pump transports the mixed resin and coal slime after flocculation and precipitation to a coal slime filter press and recovery device;

[0020] The mud cake in the coal mud filter pressing and recovery device enters the coal storage yard and is burned together with the coal in the coal storage yard.

[0021] Optionally, the standing time in (1) is more than 4 hours; the residence time of the resin waste liquid in the resin waste liquid clarification tank is more than 30 minutes; and the temperature in the coal-containing wastewater collection tank is preferably above 5°C.

[0022] Through the above technical solution, the present invention installs a coagulation and clarification unit and uses a wastewater cyclone to effectively separate the large particles of coal with adsorptive properties and the fine mud that inhibits resin adsorption in the coal-containing wastewater, thereby separating and treating the resin waste liquid and the coal-containing wastewater, making full use of the adsorption characteristics of the large particles of coal in the coal mud, greatly improving the treatment efficiency of the resin waste liquid and the coal powder-containing water, reducing the consumption of flocculants and coagulants, realizing the harmless treatment of the backwash liquid of the powdered resin filter, and reducing the treatment cost.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0025] Figure 1 It is a structural diagram of the processing system in Example 1.

[0026] Description of Reference Numerals

[0027] 1. Resin filter, 2. Resin waste liquid tank, 3. Resin waste liquid delivery pump, 4. Coal-containing wastewater collection tank, 5. Coal-containing wastewater discharge pump, 6. Wastewater cyclone, 7. Flocculant and coagulant dosing device, 8. Coal-containing wastewater clarifier, 9. Resin waste liquid clarifier, 10. Dosing pump, 11. Coal-containing wastewater sludge pump, 12. Resin waste liquid sludge pump, 13. Coal sludge filter press and recovery device. DETAILED DESCRIPTION

[0028] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0029] A first aspect of the present disclosure provides a resin waste liquid treatment system, the treatment system comprising a resin filter, a resin waste liquid tank, a resin waste liquid delivery pump, a coal-containing waste water collection tank, a coal-containing waste water discharge pump, and a coagulation and clarification unit;

[0030] The coagulation and clarification unit comprises a wastewater cyclone, a flocculant and coagulant dosing device, a dosing pump, a coal-containing wastewater clarifier and a resin waste liquid clarifier.

[0031] The treatment system disclosed herein achieves effective treatment of resin waste liquid by adding a set of coagulation and clarification units, has strong operability, and does not affect the original thermal power plant system.

[0032] According to one embodiment of the present disclosure, the resin waste liquid pool is formed in a wedge shape; the resin waste liquid pool is installed with a liquid level gauge; a first outlet is provided at the bottom of the resin waste liquid pool, the first outlet is connected to the inlet of the resin waste liquid delivery pump, and the outlet of the resin waste liquid delivery pump is connected to the resin waste liquid clarification tank.

[0033] According to one embodiment of the present disclosure, a second outlet is provided at the bottom of the coal-containing wastewater collection tank, the second outlet being connected to the inlet of the coal-containing wastewater discharge pump, and the outlet of the coal-containing wastewater discharge pump being connected to the wastewater cyclone. According to the present disclosure, an activated carbon adsorption method is used in the coal-containing wastewater collection tank, which has the characteristics of simple process, low operational difficulty, and flexible application. The coal slime in the coal-containing wastewater is a porous activated carbon with good adsorption and treatment capabilities for fiber powder and resin powder. The above embodiment is conducive to improving the treatment efficiency of resin waste liquid and coal powder-containing water.

[0034] According to one embodiment of the present disclosure, the top of the wastewater cyclone is connected to the coal-containing wastewater clarifier, and the bottom of the wastewater cyclone is connected to the resin waste liquid clarifier. The inventors have discovered that the heterogeneous fine mud in the coal-containing wastewater will preemptively adsorb the flocculating agent and then cover the surface of the coal mud. After the resin waste liquid is added, the active adsorption and agent coagulation effects are weak, and the increase in the content of large particles in the coal-containing wastewater will lead to an increase in the dosage of the agent. Therefore, before desludging the coal-containing wastewater, the coal-containing wastewater is subjected to primary desludging through a small cone angle hydrocyclone. The mud minerals can be enriched in the cyclone overflow, and the large coal particles are enriched in the bottom flow. The overflow of the coal-containing wastewater is separately collected and sent to the coal mud clarifier for dosing and flocculation.

[0035] According to the present disclosure, in the resin waste liquid clarification tank, fiber powder and resin powder are further adsorbed by coal slime to form precipitated coal slime containing fiber powder and resin powder. The flocculant mainly acts on the coal slime through electrostatic bonding, hydrogen bonding and covalent bonding, thereby causing the aggregation of particles, making the coal slime particles adsorbed with fiber powder and resin powder easier to settle; at the same time, the coagulant is added to the coal slime water. Since the mineral particles carry negative charges, they themselves are in a dispersed state in the coal slime water. At this time, the coagulant will electrolyze to produce positively charged ions to offset the surface charge of the mineral particles and compress the double layer to finally coagulate the mineral particles. The coagulation and clarification treatment unit finally achieves the rapid sedimentation of coal powder particles, fiber powder and resin powder. The main agents used in the treatment system of the present disclosure are flocculants and coagulants, which are relatively low in cost, effectively improving the utilization rate of backwash water, reducing the cost of the backwash process, and at the same time improving the equipment utilization rate of the powder resin covered filter.

[0036] According to one embodiment of the present disclosure, the outlet of the dosing pump is connected to the coal-containing wastewater clarifier and the resin waste liquid clarifier.

[0037] According to one embodiment of the present disclosure, the treatment system also includes a coal slime filter press and recovery device, a coal-containing wastewater sludge pump and a resin waste liquid sludge pump; in a further embodiment, the inlet of the coal-containing wastewater sludge pump is connected to the bottom of the coal-containing wastewater clarifier, and the outlet of the coal-containing wastewater sludge pump is connected to the coal slime filter press and recovery device; the inlet of the resin waste liquid sludge pump is connected to the bottom of the resin waste liquid clarifier, and the outlet of the resin waste liquid sludge pump is connected to the coal slime filter press and recovery device.

[0038] The second aspect of the present disclosure provides a method for treating resin waste liquid using the treatment system described in the first aspect of the present disclosure, the treatment method comprising:

[0039] (1) After the backwash waste liquid of the resin filter enters the resin waste liquid tank, it is separated into layers after standing. The upper layer is the supernatant liquid, and the lower layer is the waste liquid containing fiber powder and resin powder. The supernatant liquid overflows into the circulating water system, and the waste liquid containing fiber powder and resin powder is transported to the resin waste liquid clarification tank through the resin waste liquid delivery pump.

[0040] (2) The coal-containing wastewater is collected into the coal-containing wastewater collection pool through a pipe, and then transported to the wastewater cyclone through a coal-containing wastewater discharge pump. The wastewater cyclone performs cyclone separation and desliming on the coal-containing wastewater. The separated mud minerals are enriched in the cyclone. The separated large coal particles enter the resin waste liquid clarification pool through the bottom flow. The deslimed coal-containing wastewater is obtained in the wastewater cyclone;

[0041] (3) The desludging coal-containing wastewater flows into the coal-containing wastewater clarifier through overflow, and then undergoes flocculation by adding chemicals; the large coal-containing particles enter the resin waste liquid clarifier, and are mixed with the waste liquid containing fiber powder and resin powder, and then undergoes flocculation by adding chemicals;

[0042] (4) The flocculant and coagulant dosing device adds the flocculant and coagulant into the coal-containing wastewater clarifier and the resin waste liquid clarifier respectively through a dosing pump to perform flocculation and sedimentation.

[0043] According to one embodiment of the present disclosure, the treatment method further includes connecting the bottom of the coal-containing wastewater clarifier to a coal-containing wastewater sludge pump, and the coal-containing wastewater sludge pump transports the flocculated and precipitated coal-containing wastewater sludge to a coal sludge filter press and recovery device.

[0044] According to one embodiment of the present disclosure, the treatment method further includes connecting the bottom of the resin waste liquid clarification tank to a resin waste liquid sludge pump, which transports the flocculated and precipitated resin and coal slime mixture to a coal slime filter press and recovery device. In a further embodiment, the slime cake from the coal slime filter press and recovery device enters a coal storage yard and is burned along with the coal in the coal storage yard. This embodiment achieves harmless disposal of the resin filter backwash wastewater.

[0045] According to one embodiment of the present disclosure, the standing time in (1) is 4 hours or longer; the residence time of the resin waste liquid in the resin waste liquid clarifier is 30 minutes or longer; and the temperature in the coal-containing wastewater collection tank is preferably 5°C or higher. The above embodiment ensures that the coal-based activated carbon effectively adsorbs the fiber powder and resin powder.

[0046] The present disclosure is further illustrated below by way of examples, but the present disclosure is not limited thereby.

[0047] Example 1

[0048] (1) The backwash waste liquid of the resin filter 1 flows from the high point to the low point after entering the resin waste liquid tank 2. After standing for 5 hours, stratification occurs. The upper layer is the supernatant, and the lower layer is the waste liquid containing fiber powder and resin powder. The supernatant overflows into the circulating water system, and the waste liquid containing fiber powder and resin powder is transported to the resin waste liquid clarification tank 9 through the resin waste liquid delivery pump 3.

[0049] (2) The coal-containing wastewater is collected through a pipe to a coal-containing wastewater collection tank 4, and then transported to a wastewater cyclone 6 through a coal-containing wastewater discharge pump 5. The wastewater cyclone performs cyclone separation and desliming on the coal-containing wastewater. The separated mud minerals are enriched in the cyclone, and the separated large coal particles enter the resin waste liquid clarification tank 9 through the bottom flow. The deslimed coal-containing wastewater is obtained in the wastewater cyclone; the main components of the coal-containing wastewater are coal particles and fine mud;

[0050] (3) The desludging coal-containing wastewater flows into the coal-containing wastewater clarifier 8 through overflow, and then undergoes flocculation by adding chemicals; the large coal particles enter the resin waste liquid clarifier 9, and are mixed with the waste liquid containing fiber powder and resin powder, and then undergoes flocculation by adding chemicals; the waste liquid containing fiber powder and resin powder is mixed with the coal containing large coal particles in the resin waste liquid clarifier, and the fiber powder and resin powder are initially adsorbed by the coal containing large coal particles;

[0051] (4) The flocculant and coagulant dosing device 7 adds flocculants and coagulants to the coal-containing wastewater clarifier 8 and the resin waste liquid clarifier 9 respectively through the dosing pump 10 for flocculation and sedimentation; the controlled adsorption time of the resin waste liquid clarifier is 2 hours, and the resin waste liquid clarifier is set indoors with a temperature above 5°C; the sludge after dosing flocculation and sedimentation is transported to the coal sludge filter pressing and recovery device 13 through the coal-containing wastewater clarifier and the resin waste liquid clarifier through the coal-containing wastewater sludge pump 11 and the resin waste liquid sludge pump 12. Finally, the mud cake is transported to the boiler for combustion together with the coal in the coal storage yard, thereby realizing the harmless disposal of the backwash waste liquid of the powder resin filter.

[0052] The treatment system and treatment method disclosed in the present invention realize the sedimentation of small-particle resin powder and fiber powder generated by backwashing resin waste liquid of the resin-coated filter, and finally settle them in the coal cake for recovery and combustion, thereby realizing the harmless treatment of the treated waste liquid; the treatment system and method disclosed in the present invention effectively separates the large-particle coal with adsorptive properties and the fine mud that inhibits resin adsorption in the coal-containing wastewater through the wastewater cyclone, separates and treats the resin waste liquid and the coal-containing wastewater, and utilizes the adsorption characteristics of the large-particle coal in the coal mud to greatly improve the treatment efficiency of the resin wastewater and the coal-containing wastewater, reduce the consumption of flocculants and coagulants, and reduce the treatment cost.

[0053] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0055] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A resin waste liquid treatment system, characterized in that: The treatment system includes a resin filter, a resin waste liquid tank, a resin waste liquid delivery pump, a coal-containing waste water collection tank, a coal-containing waste water discharge pump and a coagulation and clarification unit; The coagulation and clarification unit includes a wastewater cyclone, a flocculant and coagulant dosing device, a dosing pump, a coal-containing wastewater clarifier and a resin waste liquid clarifier; Wherein, a first outlet is provided at the bottom of the resin waste liquid tank, which is connected to the inlet of the resin waste liquid delivery pump, and the outlet of the resin waste liquid delivery pump is connected to the resin waste liquid clarifier; a second outlet is provided at the bottom of the coal-containing wastewater collection tank, which is connected to the inlet of the coal-containing wastewater discharge pump, and the outlet of the coal-containing wastewater discharge pump is connected to the wastewater cyclone; the top of the wastewater cyclone is connected to the coal-containing wastewater clarifier, and the bottom of the wastewater cyclone is connected to the resin waste liquid clarifier; the outlet of the dosing pump is connected to the coal-containing wastewater clarifier and the resin waste liquid clarifier.

2. The processing system according to claim 1, wherein The resin waste liquid pool is formed in a wedge shape; and a liquid level meter is installed in the resin waste liquid pool.

3. The processing system according to claim 1, wherein: The treatment system also includes a coal sludge filter press and recovery device, a coal-containing wastewater sludge pump, and a resin waste liquid sludge pump; The inlet of the coal-containing wastewater sludge pump is connected to the bottom of the coal-containing wastewater clarifier, and the outlet of the coal-containing wastewater sludge pump is connected to the coal slime filter press and recovery device; the inlet of the resin waste liquid sludge pump is connected to the bottom of the resin waste liquid clarifier, and the outlet of the resin waste liquid sludge pump is connected to the coal slime filter press and recovery device.

4. A method for treating resin waste liquid using the treatment system according to any one of claims 1 to 3, characterized in that: The method includes: (1) After the backwash waste liquid of the resin filter enters the resin waste liquid tank, it is separated into layers after standing. The upper layer is the supernatant liquid, and the lower layer is the waste liquid containing fiber powder and resin powder. The supernatant liquid overflows into the circulating water system, and the waste liquid containing fiber powder and resin powder is transported to the resin waste liquid clarification tank through the resin waste liquid delivery pump. (2) The coal-containing wastewater is collected into the coal-containing wastewater collection pool through a pipe, and then transported to the wastewater cyclone through a coal-containing wastewater discharge pump. The wastewater cyclone performs cyclone separation and desliming on the coal-containing wastewater. The separated mud minerals are enriched in the cyclone. The separated large coal particles enter the resin waste liquid clarification pool through the bottom flow. The deslimed coal-containing wastewater is obtained in the wastewater cyclone; (3) The desludging coal-containing wastewater flows into the coal-containing wastewater clarifier through overflow, and then undergoes flocculation by adding chemicals; the large coal-containing particles enter the resin waste liquid clarifier, and are mixed with the waste liquid containing fiber powder and resin powder, and then undergoes flocculation by adding chemicals; (4) The flocculant and coagulant dosing device adds the flocculant and coagulant into the coal-containing wastewater clarifier and the resin waste liquid clarifier respectively through a dosing pump to perform flocculation and sedimentation.

5. The processing method according to claim 4, wherein: The treatment method further includes connecting the bottom of the coal-containing wastewater clarifier to a coal-containing wastewater sludge pump, and the coal-containing wastewater sludge pump transports the coal-containing wastewater sludge after flocculation and precipitation to a coal sludge filter press and recovery device.

6. The processing method according to claim 4, wherein: The treatment method further includes connecting the bottom of the resin waste liquid clarifier tank to a resin waste liquid sludge pump, and the resin waste liquid sludge pump transports the flocculated and precipitated resin and coal slime mixture to a coal slime filter press and recovery device; The mud cake in the coal mud filter pressing and recovery device enters the coal storage yard and is burned together with the coal in the coal storage yard.

7. The processing method according to claim 4, wherein: The standing time mentioned in (1) is more than 4 hours; The residence time of the resin waste liquid in the resin waste liquid clarification tank is more than 30 minutes; the temperature in the coal-containing wastewater collection tank is above 5°C.

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