Waste acid cleaning solution treatment system

Abstract

The utility model discloses a waste acid cleaning solution treatment system which comprises a fiber filter, a neutralizing tank, an air floatation tank, a multi-medium filter, a filter bag assembly, a reuse water concentrated tank, a reuse water diluted tank, a membrane concentration device, an evaporator and a drying machine, waste cleaning liquid is conveyed to the fiber filter through the conveying pump; condensate water of the membrane concentration device, condensate water of the evaporator and condensate water of the drying agent flow into the reuse water dilution tank, and water in the reuse water dilution tank is conveyed into the water storage tank through the reuse water supply pump. The device disclosed by the utility model is integrated with the existing production process, and realizes cyclic utilization of cleaning waste liquid and zero discharge of waste water. The thought of main circulation and partial concentration evaporation is adopted, the design volume of the evaporation drying process is reduced as much as possible while the water quality and water quantity requirements of process water are met, the treatment process is simplified, and the treatment cost is reduced.

Description

Technical Field

[0001] The utility model specifically relates to a waste acid cleaning liquid processing system. Background Art

[0002] In the wool felt production process, sulfuric acid is often used for shrinking. The wool felt treated with sulfuric acid needs to be washed with clean water and dehydrated before the subsequent drying step.

[0003] The traditional process is to neutralize the waste acid cleaning liquid and then discharge it for treatment. However, due to stringent environmental protection requirements, the cost of treating wastewater after discharge is getting higher and higher. It is urgent to adopt new wastewater treatment processes to achieve the recycling of wastewater and create a "green factory". Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a waste acid cleaning liquid treatment system.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] The utility model discloses a waste acid cleaning liquid treatment system, comprising: a fiber filter, a neutralization tank, an air flotation tank, a multi-media filter, a filter bag assembly, a recycled water concentration tank, a recycled water dilution tank, a membrane concentration device, an evaporator and a dryer;

[0007] The cleaning waste liquid is transported to the fiber filter through a delivery pump;

[0008] The fiber filter is used to filter and remove large particle pollutants from the cleaning waste liquid;

[0009] The neutralization tank is used to neutralize the cleaning waste liquid after passing through the fiber filter;

[0010] The flotation tank is used to remove suspended particles in the water from the cleaning waste liquid after neutralization;

[0011] Multi-media filters are used to remove scum from the waste liquid after flotation;

[0012] The filter bag assembly includes: an oil-separating filter bag filter, which is used to remove oil droplets from the cleaning waste liquid after passing through the multi-media filter;

[0013] The recycled water concentrate tank is used to carry the cleaning waste liquid after being filtered by the filter bag assembly;

[0014] The membrane concentration device is used to process and recycle the liquid in the recycled water concentration tank;

[0015] The evaporator is used to evaporate the concentrated water after being treated by the membrane concentration device;

[0016] The dryer is used to dry the concentrated water after being treated by the evaporator;

[0017] The condensed water from the membrane concentration device, the condensed water from the evaporator, and the condensed water from the desiccant flow into the reuse water tank, and the water in the reuse water tank is transported to the water storage tank through the reuse water supply pump.

[0018] Based on the above technical solution, the following improvements can be made:

[0019] As a preferred solution, the slag discharge port of the fiber filter is connected to a collecting tank, and the collecting tank is used to collect waste slag.

[0020] As a preferred solution, the neutralization tank includes: a plurality of tank grids for different neutralization modes.

[0021] As a preferred solution, the cleaning waste liquid in the neutralization tank is lifted to the flotation tank by an acid-base resistant self-priming pump.

[0022] As a preferred solution, the slag discharge port of the air flotation tank is connected to a mud press, and the mud press is used to dehydrate the mud discharged from the air flotation tank.

[0023] As a preferred solution, the recycled water concentrate tank and the recycled water dilute tank are two different cells of the recycled water tank.

[0024] As a preferred solution, a recycled water supply pump is used to backwash the multi-media filter.

[0025] As a preferred solution, the filter bag assembly includes: an oil-separating filter bag filter and a plurality of secondary filter bag filters.

[0026] The utility model discloses a waste acid cleaning liquid treatment system, which has the following beneficial effects:

[0027] First, the utility model can be integrated with the existing production process to achieve the recycling of cleaning waste liquid and zero wastewater discharge.

[0028] Second, the utility model adopts the idea of ​​main circulation and partial concentrated evaporation, which can reduce the design volume of the evaporation and drying process as much as possible while meeting the water quality and quantity requirements of the process water, simplify the treatment process, and reduce the treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic structural diagram of a waste acid cleaning liquid treatment system provided in an embodiment of the utility model.

[0031] Figure 2 A schematic diagram of the structure of a neutralization tank provided in an embodiment of the utility model (the two tank cells are not conductive).

[0032] Figure 3 A schematic diagram of the structure of a neutralization tank provided in an embodiment of the utility model (two cells are connected).

[0033] Among them: 1-fiber filter, 2-neutralization tank, 3-flotation tank, 4-multi-media filter, 5-oil-separating bag filter, 6-secondary bag filter, 7-recycled water tank, 8-membrane concentration device, 9-evaporator, 10-dryer, 11-motherboard, 12-daughterboard, 13-through hole, 14-limiting block, 15-mud press. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Meanwhile, expressions such as “first” and “second” are only used to distinguish multiple configurations, rather than to limit the order between configurations or other features.

[0037] In addition, the expression of “comprising” an element is an “open” expression, which simply means that a corresponding component exists, and should not be interpreted as excluding additional components.

[0038] In order to achieve the purpose of the utility model, in some embodiments of the waste acid cleaning liquid treatment system, as Figure 1 As shown, the waste acid cleaning liquid treatment system includes: a fiber filter 1, a neutralization tank 2, an air flotation tank 3, a multi-media filter 4, a filter bag assembly, a recycled water concentration tank, a recycled water dilution tank, a membrane concentration device 8, an evaporator 9 and a dryer 10.

[0039] The cleaning waste liquid is transported to the fiber filter 1 through the transport pump.

[0040] The fiber filter 1 is used to filter and remove large particle pollutants (such as wool scraps and sand and gravel, etc.) in the cleaning waste liquid.

[0041] The neutralization tank 2 is used to neutralize the cleaning waste liquid after passing through the fiber filter 1 .

[0042] The effluent from the neutralization tank 2 enters the flotation tank 3, which removes suspended particles from the water while breaking the emulsion and removing part of the floating oil. The lifting from the neutralization tank 2 to the flotation tank 3 uses an acid-base resistant self-priming pump, which is easy to install and maintain, has low investment costs, and a low failure rate compared to a submersible pump. The risk of empty air intake in the suction pipeline of the self-priming pump is minimized by optimizing the pipeline layout.

[0043] The effluent from the flotation tank 3 enters the multi-media filter 4 to remove a small amount of scum from the flotation effluent. The filter material of the multi-media filter 4 is arranged in multiple layers, and each layer uses uniform filter material. Through reasonable grading, the filter's pollution resistance is greatly increased, the effluent water quality is improved, and the backwash cycle is reduced.

[0044] The filter bag assembly includes: an oil-separating filter bag filter 5 and a secondary filter bag filter 6. According to the characteristics of the cleaning waste liquid, the oil-separating filter bag filter 5 is used to reduce the oil droplets dispersed in the water quality, protect the subsequent membrane concentration device 8 from being polluted by oil, and extend the cleaning cycle of the membrane concentration device 8.

[0045] The recycled water concentrate tank is used to carry the cleaning waste liquid after being filtered by the filter bag assembly.

[0046] The membrane concentration device 8 is used to process and recover the liquid in the reuse water concentration tank.

[0047] The evaporator 9 is used to evaporate the concentrated water after being treated by the membrane concentration device 8 .

[0048] The dryer 10 is used to dry the concentrated water after being processed by the evaporator 9 .

[0049] The condensed water from the membrane concentration device 8, the condensed water from the evaporator 9, and the condensed water from the desiccant flow into the reuse water tank, and the water in the reuse water tank is transported to the water storage tank by the reuse water supply pump.

[0050] The recycled water concentrate tank and the recycled water desalination tank are two different tank compartments of the recycled water tank 7, corresponding to the concentrated water side and the desalinated water side. The outlet water of the secondary filter bag filter 6 enters the concentrated water side, and the suction port of the recycled water supply pump is installed on the desalinated water side.

[0051] Part of the concentrated water from the concentrated water side enters the membrane concentration device 8, and the fresh water enters the fresh water side for recycling. The system calculates the total system water volume through instrument monitoring, compares it with the set water volume, and determines whether to replenish the lost water based on the difference. The replenished water enters the fresh water side of the reuse water tank 7.

[0052] The membrane concentration device 8 can be opened regularly to process and recycle the concentrated water side of the reuse water tank 7. The daily processed water volume matches the daily water consumption, and the water is recycled in proportion to the total daily water consumption to ensure that the total amount of dissolved solids in the recycling system is constant.

[0053] The concentrated water from the membrane concentration device 8 enters the evaporator 9. According to the water quality characteristics, the natural circulation MVR evaporator 9 is adopted, which is more energy-efficient than the hydraulic circulation. The heat exchange between the inlet water of the evaporator 9 and the recycled water is carried out to save energy. At the same time, the inlet pump of the evaporator 9, the condensed water drainage pump and the internal liquid level of the evaporator 9 are linked to continuously inlet and outlet water, reducing the problem of excessive outlet water temperature caused by batch inlet and outlet water.

[0054] The concentrated water from the evaporator 9 enters the dryer 10. In order to prevent the evaporated concentrated water from crystallizing and clogging the pipeline during the shutdown of the dryer 10 in winter, a reasonable evaporation concentration ratio is set. Different concentration ratios are automatically used in summer and winter to reduce the concentration of the concentrated liquid while extending the operating time of the dryer 10 and eliminating the risk of crystallization during winter operation.

[0055] In order to further optimize the implementation effect of the utility model, in some other embodiments, the other characteristic technologies are the same, and the difference is that the slag discharge port of the fiber filter 1 is connected to the collecting tank, and the collecting tank is used to collect waste slag.

[0056] The fiber filter 1 has an automatic backwashing and slag removal function, and automatically discharges the flushing waste residue to the collection tank; the ditch wastewater contains some oil leaked from the machine tool, which can be adsorbed by the wool debris and discharged together through the fiber filter 1, thereby achieving the purpose of indirect oil removal.

[0057] In order to further optimize the implementation effect of the utility model, in some other embodiments, the other characteristic technologies are the same, except that the neutralization tank 2 includes: two slots for different neutralization modes, one adopts a group neutralization mode, and the other adopts a micro neutralization mode.

[0058] The drainage of cleaning waste liquid is a batch reaction, and the water volume is large in a short time, and the concentration varies greatly according to different batches. In view of this feature, a two-grid neutralization tank 2 is used, and a coarse neutralization mode and a micro neutralization mode are adopted. Each grid of the neutralization tank 2 can be equipped with a pH meter, and the cleaning waste liquid is monitored by an instrument. The frequency of the dosing pump is adapted according to the high and low monitoring values, and the dosage is adaptive according to the different drainage concentrations. The dosing is coordinated in multiple aspects to ensure the stability of the effluent pH.

[0059] Furthermore, in some embodiments, adjacent slots are separated by a mother board and a daughter board that can slide relative to each other. The mother board 11 is fixed in the neutralization slot 2, and the daughter board 12 is installed on the mother board 11 and slides relative to it. A number of through holes 13 are distributed on both the daughter board 12 and the mother board 11. By adjusting the relative position of the daughter board 12 and the mother board 11, the conductivity between adjacent slots can be adjusted.

[0060] Furthermore, the daughter board 12 and the mother board 11 are slidably connected via a guide sliding assembly, and the guide sliding assembly may be, but is not limited to, a protrusion groove structure or the like.

[0061] Furthermore, a limit block 14 is provided on the motherboard 11 for limiting the sliding area of ​​the daughterboard 12. Figure 2 and Figure 3 shown.

[0062] In order to further optimize the implementation effect of the utility model, in some other embodiments, the other characteristic technologies are the same, and the difference is that the cleaning waste liquid in the neutralization tank 2 is lifted to the flotation tank 3 by an acid and alkali resistant self-priming pump.

[0063] In order to further optimize the implementation effect of the utility model, in some other embodiments, the other characteristic technologies are the same, the difference is that the slag discharge port of the flotation tank 3 is connected to the mud press 15, and the mud press 15 is used to dehydrate the mud discharged from the flotation tank 3.

[0064] The air-floated mud is collected and sent to the plate-frame mud press 15 for dehydration.

[0065] In order to further optimize the implementation effect of the utility model, in some other implementations, the remaining characteristic technologies are the same, and the difference is that a recycled water supply pump is used to backwash the multi-media filter 4.

[0066] According to the backwash characteristics of the multi-media filter 4, a recycled water supply pump is used for backwashing. One pump is used for multiple purposes, and no additional backwash pump is required to save investment cost and operating cost.

[0067] In view of the existing problems: such as: 1) in the production of wool felt, the waste acid cleaning liquid needs to achieve zero discharge within the factory due to environmental protection and cost requirements; 2) due to insufficient steam supply in the factory, the cost of using concentrated evaporation technology for all wastewater is very high.

[0068] The utility model discloses a waste acid cleaning liquid treatment system, which has the following beneficial effects:

[0069] First, the utility model can be integrated with the existing production process to achieve the recycling of cleaning waste liquid and zero wastewater discharge.

[0070] Second, the utility model adopts the idea of ​​main circulation and partial concentrated evaporation, which can reduce the design volume of the evaporation and drying process as much as possible while meeting the water quality and quantity requirements of the process water, simplify the treatment process, and reduce the treatment cost.

[0071] Due to the heavy workload of on-site equipment maintenance personnel, in order to reduce operating and maintenance costs, the equipment uses a variety of low-cost instruments for online monitoring.

[0072] In summary, the system of the utility model can achieve zero emissions, reduce water and drainage costs, supplement the investment costs of environmental protection equipment operation to a certain extent, reduce the investment costs of corporate environmental protection equipment, and improve environmental benefits.

[0073] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0074] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0075] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

[0076] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

Claims

1. Waste acid cleaning liquid treatment system, characterized in that: include: Fiber filter, neutralization tank, flotation tank, multi-media filter, filter bag assembly, recycled water concentration tank, recycled water desalination tank, membrane concentration device, evaporator and dryer; The cleaning waste liquid is transported to the fiber filter through a delivery pump; The fiber filter is used to filter and remove large particle pollutants in the cleaning waste liquid; The neutralization tank is used to neutralize the cleaning waste liquid after passing through the fiber filter; The flotation tank is used to remove suspended particles in the water quality of the cleaning waste liquid after neutralization; The multi-media filter is used to remove scum from the waste liquid after washing the water from the flotation; The filter bag assembly comprises: an oil-separating filter bag filter, the oil-separating filter bag filter being used to remove oil droplets in the cleaning waste liquid after passing through the multi-media filter; The recycled water concentration tank is used to carry the cleaning waste liquid filtered by the filter bag assembly; The membrane concentration device is used to process and recover the liquid in the reuse water concentration tank; The evaporator is used to evaporate the concentrated water after being treated by the membrane concentration device; The dryer is used to dry the concentrated water after being processed by the evaporator; The condensed water of the membrane concentration device, the condensed water of the evaporator and the condensed water of the desiccant flow into the reuse water tank, and the water in the reuse water tank is transported to the water storage tank through the reuse water supply pump.

2. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The slag discharge port of the fiber filter is communicated with a collecting tank, and the collecting tank is used to collect waste slag.

3. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The neutralization tank comprises: a plurality of tank grids for different neutralization modes.

4. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The cleaning waste liquid in the neutralization tank is lifted to the flotation tank by an acid- and alkali-resistant self-priming pump.

5. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The slag discharge port of the air flotation tank is communicated with a mud press, and the mud press is used to dehydrate the mud discharged from the air flotation tank.

6. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The recycled water concentrate tank and the recycled water dilute tank are two different tank compartments of the recycled water tank.

7. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The multi-media filter is backwashed using a recycled water supply pump.

8. The waste acid cleaning liquid treatment system according to claim 1, characterized in that: The filter bag assembly comprises: an oil-separating filter bag filter and a plurality of secondary filter bag filters.

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