A device for treating wastewater containing complexed nickel and phosphorus

Abstract

The utility model provides a kind of treatment device of organic wastewater containing complex nickel and phosphorus, it is related to the treatment of organic wastewater containing heavy metal ions, including the pretreatment module, initial breakage module, depth impurity removal module, depth oil removal module connected in sequence;When organic wastewater containing complex nickel and phosphorus is sequentially pretreated, initial breakage and enters depth impurity removal module, first remove most of the oil and heavy metal in wastewater by flocculation sedimentation tank, obtain oil-containing, heavy metal sludge, then carry out depth breakage, impurity removal treatment by the ozone advanced oxidation carried out in third reaction tank, and then realize the final purification of wastewater by depth oil removal module.The treatment device has the advantages of simple process design, wide application range, strong treatment effect, low treatment cost, etc., can realize the cyclic efficient utilization of wastewater, reduce water resource waste.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and relates to the treatment of organic wastewater containing heavy metal ions, and particularly to a treatment device for organic wastewater containing complexed nickel and phosphorus. Background Technology

[0002] During the lithium battery recycling process, wastewater containing heavy metal ions is generated. Due to the use of various chemical reagents, such as complexing agents and chelating agents, the heavy metal ions in the wastewater are complexed and chelated to form stable complexed compounds that cannot be removed by simple chemical precipitation or physical adsorption methods.

[0003] Existing treatment methods for this type of industrial wastewater include catalytic oxidation, electrochemical oxidation, and resin exchange. However, since single oxidation treatment technologies (such as Fenton and ozone) have limitations, the actual treatment process tends to enhance the effects of complex breaking, heavy metal removal, and impurity removal through synergistic technology to improve the applicability of the synergistic process and the high efficiency of target pollutant removal.

[0004] In the lithium battery recycling process, a type of organic wastewater containing complexed nickel and phosphorus is often generated. The nickel in this wastewater often forms complexed nickel with organic complexing agents such as EDTA and citric acid, while the phosphorus often exists in the form of organophosphates, such as phosphate esters used as electrolyte additives or binders, or other phosphorus-containing organic decomposition products. When complexed nickel and organophosphates coexist in the same wastewater, they may compete for oxidants (e.g., ·OH radicals, ozone, etc.), causing the oxidant to preferentially treat one type of pollutant while neglecting the other, resulting in uneven oxidation treatment. Furthermore, the nickel ions released after complex breakdown may encounter phosphate ions released by hydrolysis, potentially forming nickel phosphate precipitates, leading to equipment blockage or unclear effluent. Therefore, the treatment of organic wastewater containing complexed nickel and phosphorus presents certain technical challenges.

[0005] In summary, there is a need to develop a treatment device for organic wastewater containing complexed nickel and phosphorus. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a treatment device for organic wastewater containing complexed nickel and phosphorus. The device comprises a pretreatment module, a primary complex-breaking module, a deep impurity removal module, and a deep oil removal module connected in sequence. After the wastewater containing complexed nickel and phosphorus passes through the pretreatment and primary complex-breaking stages and enters the deep impurity removal module, it first passes through a flocculation sedimentation tank to remove most of the oil and heavy metals, resulting in oil- and heavy metal-containing sludge. Then, it undergoes advanced ozone oxidation in a third reaction tank for further complex-breaking and impurity removal. Finally, the wastewater passes through the deep oil removal module to achieve final purification. This treatment device has advantages such as simple process design, wide applicability, strong treatment effect, and low treatment cost. It enables efficient recycling of wastewater and reduces water waste.

[0007] To achieve this objective, the present invention adopts the following technical solution: The purpose of this utility model is to provide a treatment device for organic wastewater containing complexed nickel and phosphorus, comprising a pretreatment module, a primary complex breaking module, a deep impurity removal module, and a deep oil removal module connected in sequence. The pretreatment module includes a first reaction vessel for performing pretreatment; The initial complex-breaking module includes a second reaction tank and a complex-breaking agent storage tank; wastewater from the first reaction tank enters the second reaction tank, and the complex-breaking agent storage tank is used to introduce complex-breaking agent into the second reaction tank; The deep impurity removal module includes a flocculation sedimentation tank, a first solid-liquid separator, a third reaction tank, a flocculant storage tank, a precipitant storage tank, an ozone generator, and a tail gas collection tank. Wastewater from the second reaction tank enters the flocculation sedimentation tank. The flocculant storage tank and the precipitant storage tank are used to introduce flocculant and precipitant into the flocculation sedimentation tank, respectively. Slurry from the flocculation sedimentation tank enters the first solid-liquid separator for solid-liquid separation. The resulting liquid phase enters the third reaction tank. The outlet of the ozone generator is connected to the bottom inlet of the third reaction tank, and the gas inlet of the tail gas collection tank is connected to the top gas outlet of the third reaction tank. The deep oil removal module includes an activated carbon tank, into which wastewater from the third reaction tank enters.

[0008] As a preferred technical solution of this utility model, the pretreatment module further includes an air flotation oil storage tank, a compressed air-ozone storage tank, and a dilute acid storage tank. The outlet of the compressed air-ozone storage tank is connected to the bottom gas inlet of the first reaction tank. The dilute acid storage tank is used to introduce dilute acid into the first reaction tank to adjust the pH value. The air flotation oil storage tank is used to collect the oil on the surface of the wastewater in the first reaction tank.

[0009] As a preferred technical solution of this utility model, the pretreatment module further includes an air compressor, the outlet of which is connected to the inlet of the compressed air-ozone storage tank, and the outlet of the exhaust gas collection tank is connected to the inlet of the air compressor, for providing ozone.

[0010] As a preferred technical solution of this utility model, the complex-breaking agent storage tank includes a first complex-breaking agent storage tank and a second complex-breaking agent storage tank. The first complex-breaking agent storage tank is used to introduce a first complex-breaking agent into the upper part of the second reaction tank, and the second complex-breaking agent storage tank is used to introduce a second complex-breaking agent into the lower part of the second reaction tank.

[0011] As a preferred embodiment of this invention, the outlet of the precipitant storage tank is also connected to an upper inlet of the third reaction tank for introducing precipitant into the third reaction tank.

[0012] As a preferred technical solution of this utility model, the first solid-liquid separator includes a plate and frame filter press.

[0013] As a preferred technical solution of this utility model, the deep oil removal module further includes a second solid-liquid separator, which is disposed on the pipeline between the third reaction tank and the activated carbon tank.

[0014] As a preferred embodiment of the present invention, the second solid-liquid separator includes a filter.

[0015] As a preferred technical solution of this utility model, the deep oil removal module further includes a recycled water storage tank, and the outlet of the activated carbon tank is connected to the inlet of the recycled water storage tank.

[0016] As a preferred technical solution of this utility model, the outlet of the recycled water storage tank is independently connected to the complex-breaking agent storage tank, the flocculant storage tank, and the precipitant storage tank.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The treatment device described in this utility model has the advantages of simple process design, wide applicability, strong treatment effect and low treatment cost, and can realize the efficient recycling of wastewater and reduce water waste.

[0018] (2) The treatment device described in this utility model can treat mixed wastewater containing one or more pollutants, such as organic wastewater containing complexed nickel and phosphorus, as well as complexed heavy metal wastewater, phosphorus-containing wastewater, oil-containing or organic wastewater, etc. from other sources. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the treatment device for organic wastewater containing complexed nickel and phosphorus as described in Embodiment 1 of this utility model; Among them, 1-first reaction tank, 2-compressed air-ozone storage tank, 3-air flotation oil storage tank, 4-dilute acid storage tank, 5-air compressor, 6-second reaction tank, 7-first complexing agent storage tank, 8-second complexing agent storage tank, 9-flocculation sedimentation tank, 10-first solid-liquid separator, 11-third reaction tank, 12-flocculating agent storage tank, 13-precipitant storage tank, 14-ozone generator, 15-tail gas collection tank, 16-activated carbon tank, 17-reclaimed water storage tank. Detailed Implementation

[0020] To make the technical solution, objectives, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. In the fields of electricity and communication, they can refer to a wired connection or a wireless connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] This utility model provides a treatment device for organic wastewater containing complexed nickel and phosphorus, comprising a pretreatment module, a primary complex-breaking module, a deep impurity removal module, and a deep oil removal module connected in sequence. The pretreatment module includes a first reaction tank for pretreatment. The primary complex-breaking module includes a second reaction tank and a complex-breaking agent storage tank. Wastewater from the first reaction tank enters the second reaction tank, and the complex-breaking agent storage tank is used to introduce complex-breaking agent into the second reaction tank. The deep impurity removal module includes a flocculation sedimentation tank, a first solid-liquid separator, a third reaction tank, a flocculant storage tank, a precipitant storage tank, an ozone generator, and a tailings system. The system includes a gas collection tank; wastewater from the second reaction tank enters the flocculation sedimentation tank; the flocculant storage tank and the precipitant storage tank are used to introduce flocculant and precipitant into the flocculation sedimentation tank, respectively; slurry from the flocculation sedimentation tank enters the first solid-liquid separator for solid-liquid separation, and the resulting liquid phase enters the third reaction tank; the outlet of the ozone generator is connected to the bottom inlet of the third reaction tank, and the gas inlet of the tail gas collection tank is connected to the top gas outlet of the third reaction tank; the deep oil removal module includes an activated carbon tank, and wastewater from the third reaction tank enters the activated carbon tank.

[0024] Preferably, the pretreatment module further includes an air flotation oil storage tank, a compressed air-ozone storage tank, and a dilute acid storage tank. The outlet of the compressed air-ozone storage tank is connected to the bottom gas inlet of the first reaction tank. The dilute acid storage tank is used to introduce dilute acid into the first reaction tank to adjust the pH value. The air flotation oil storage tank is used to collect oil from the surface of the wastewater in the first reaction tank.

[0025] Preferably, the pretreatment module further includes an air compressor, the outlet of which is connected to the inlet of the compressed air-ozone storage tank, and the outlet of the exhaust gas collection tank is connected to the inlet of the air compressor, for providing ozone.

[0026] Preferably, the complex-breaking agent storage tank includes a first complex-breaking agent storage tank and a second complex-breaking agent storage tank, wherein the first complex-breaking agent storage tank is used to introduce a first complex-breaking agent into the upper part of the second reaction tank, and the second complex-breaking agent storage tank is used to introduce a second complex-breaking agent into the lower part of the second reaction tank.

[0027] Preferably, the outlet of the precipitant storage tank is also connected to an upper inlet of the third reaction tank for introducing precipitant into the third reaction tank.

[0028] Preferably, the first solid-liquid separator includes a plate and frame filter press.

[0029] Preferably, the deep oil removal module further includes a second solid-liquid separator, which is disposed on the pipeline between the third reaction tank and the activated carbon tank.

[0030] Preferably, the second solid-liquid separator includes a filter.

[0031] Preferably, the deep oil removal module further includes a recycled water storage tank, and the outlet of the activated carbon tank is connected to the inlet of the recycled water storage tank.

[0032] Preferably, the outlet of the recycled water storage tank is independently connected to the complex-breaking agent storage tank, the flocculant storage tank, and the precipitant storage tank.

[0033] Example 1 See Figure 1 This embodiment provides a treatment device for organic wastewater containing complexed nickel and phosphorus, including a pretreatment module, a primary complex breaking module, a deep impurity removal module, and a deep oil removal module connected in sequence; The pretreatment module includes a first reaction tank 1, a compressed air-ozone storage tank 2, an air flotation oil storage tank 3, a dilute acid storage tank 4, and an air compressor 5. Material A represents organic wastewater containing complexed nickel and phosphorus, which enters through the first inlet of the first reaction tank 1. The outlet of the compressed air-ozone storage tank 2 is connected to the bottom gas inlet of the first reaction tank 1. The dilute acid storage tank 4 is connected to the second inlet of the first reaction tank 1 and is used to introduce dilute acid into the first reaction tank 1 to adjust the pH value. An overflow port is provided inside the first reaction tank 1, and the oil on the surface of the overflowing wastewater is collected in the air flotation oil storage tank 3 through the bottom pipe of the first reaction tank 1. The outlet of the air compressor 5 is connected to the inlet of the compressed air-ozone storage tank 2, and the outlet of the exhaust gas collection tank 15 is connected to the inlet of the air compressor 5. Material B represents air, which is mixed with ozone-containing exhaust gas from the exhaust gas collection tank 15 and then enters the air compressor 5. The resulting compressed air-ozone mixed gas is stored in the compressed air-ozone storage tank 2. The initial complex-breaking module includes a second reaction tank 6, a first complex-breaking agent storage tank 7, and a second complex-breaking agent storage tank 8; wastewater from the first reaction tank 1 enters the second reaction tank 6, the first complex-breaking agent storage tank 7 is used to introduce the first complex-breaking agent into the upper part of the second reaction tank 6, and the second complex-breaking agent storage tank 8 is used to introduce the second complex-breaking agent into the lower part of the second reaction tank 6. The deep impurity removal module includes a flocculation sedimentation tank 9, a first solid-liquid separator 10, a third reaction tank 11, a flocculant storage tank 12, a precipitant storage tank 13, an ozone generator 14, and a tail gas collection tank 15. Wastewater from the second reaction tank 6 enters the flocculation sedimentation tank 9. The flocculant storage tank 12 and the precipitant storage tank 13 are used to introduce flocculant and precipitant into the flocculation sedimentation tank 9, respectively. The slurry from the flocculation sedimentation tank 9 enters the first solid-liquid separator 10 for solid-liquid separation. The resulting liquid phase enters the third reaction tank 11. The outlet of the ozone generator 14 is connected to the bottom inlet of the third reaction tank 11, and the gas inlet of the tail gas collection tank 15 is connected to the top gas outlet of the third reaction tank 11. The outlet of the precipitant storage tank 13 is also connected to an upper inlet of the third reaction tank 11 for introducing precipitant into the third reaction tank 11. The first solid-liquid separator 10 is a plate and frame filter press. The deep oil removal module includes an activated carbon tank 16 and a recycled water storage tank 17. Wastewater from the third reaction tank enters the activated carbon tank 16. The outlet of the activated carbon tank 16 is connected to the inlet of the recycled water storage tank 17. The outlet of the recycled water storage tank 17 is independently connected to the first complexing agent storage tank 7, the flocculant storage tank 12, and the precipitant storage tank 13.

[0034] The processing device described in this embodiment includes the following components during actual operation: The organic wastewater containing complexed nickel and phosphorus first enters the first reaction tank 1. At the same time, compressed air and collected ozone mixed gas from the compressed air-ozone storage tank 2 are introduced into the bottom of the first reaction tank 1, and dilute acid from the dilute acid storage tank 4 is added to adjust the pH value. The complexes in the wastewater are pre-oxidized by the mixed gas, and some oil is carried to the surface of the wastewater by the bubbles. As the oil flows out through the internal overflow port of the first reaction tank 1, it is collected in the air flotation oil storage tank 3 through the bottom pipe, thus achieving the purpose of pre-oxidation and pre-oil removal simultaneously. The pretreated wastewater is transported through pipelines to the primary complex-breaking module. The pretreated wastewater is first transported through pipelines to the second reaction tank 6, and ferrous sulfate solution from the first complex-breaking agent storage tank 7 and hydrogen peroxide from the second complex-breaking agent storage tank 8 are added simultaneously for feeding and reaction. The hydrogen peroxide feeding pipeline extends below the liquid surface, close to the bottom of the second reaction tank 6, to improve the utilization efficiency of hydrogen peroxide. The wastewater after initial complex breaking is transported through pipelines to the deep impurity removal module. The wastewater after initial complex breaking is first transferred through pipelines to the flocculation sedimentation tank 9. Lime slurry from the precipitant storage tank 13 is added to adjust the pH value, and then PAM from the flocculant storage tank 12 is added. The resulting slurry is separated by a plate and frame filter press. The slag, represented by material C, can be discharged for treatment. The liquid is transferred to the third reaction tank 11. At the same time, ozone from the ozone generator 14 is introduced from the bottom for deep complex breaking and impurity removal. The ozone tail gas generated during the process is collected and stored in the tail gas collection tank 15 for secondary use to improve ozone utilization. After the reaction is completed, lime slurry from the precipitant storage tank 13 is added again to adjust the pH value and further remove nickel. After deep impurity removal, the wastewater is transported through pipelines to the deep oil removal module. The wastewater is first transferred to the activated carbon tank 16, where it undergoes adsorption by the activated carbon to achieve deep oil removal. Meanwhile, the purified wastewater is stored in the recycled water storage tank 17 and can be reused as bottom water in the preparation of the first complex-breaking agent (ferrous sulfate solution), flocculant, and precipitant, thus realizing the recycling of wastewater.

[0035] In this embodiment, ozone can be collected by the exhaust gas collection tank and reused for pretreatment, which can save the investment in ozone exhaust gas treatment equipment; the outlet of the compressed air-ozone storage tank is connected to the bottom gas inlet of the first reaction tank. While the compressed air-ozone mixed gas is introduced for pre-oxidation, some oil is carried to the surface of the wastewater by the air bubbles, thereby achieving pre-oil removal through air flotation; the second complex-breaking agent storage tank storing hydrogen peroxide has a feeding pipe that extends below the liquid surface, close to the bottom of the second reaction tank, which can improve the utilization efficiency of hydrogen peroxide.

[0036] In summary, this invention provides a treatment device for organic wastewater containing complexed nickel and phosphorus. It features simple modular design, ease of industrial production, and high efficiency. While fully utilizing ozone exhaust gas, reducing acid / alkali / flocculator consumption, and efficiently separating precipitates, it simultaneously achieves efficient complex breaking of heavy metal complexes and Ni... 2+ It can efficiently remove coexisting pollutants and solve the problems of high difficulty, complex process and high cost in treating wastewater containing complex nickel and phosphorus.

[0037] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A treatment device for organic wastewater containing complexed nickel and phosphorus, characterized in that, It includes a pretreatment module, a primary network breaking module, a deep impurity removal module, and a deep oil removal module connected in sequence; The pretreatment module includes a first reaction vessel for performing pretreatment; The initial complex-breaking module includes a second reaction tank and a complex-breaking agent storage tank; wastewater from the first reaction tank enters the second reaction tank, and the complex-breaking agent storage tank is used to introduce complex-breaking agent into the second reaction tank; The deep impurity removal module includes a flocculation sedimentation tank, a first solid-liquid separator, a third reaction tank, a flocculant storage tank, a precipitant storage tank, an ozone generator, and a tail gas collection tank. Wastewater from the second reaction tank enters the flocculation sedimentation tank. The flocculant storage tank and the precipitant storage tank are used to introduce flocculant and precipitant into the flocculation sedimentation tank, respectively. Slurry from the flocculation sedimentation tank enters the first solid-liquid separator for solid-liquid separation. The resulting liquid phase enters the third reaction tank. The outlet of the ozone generator is connected to the bottom inlet of the third reaction tank, and the gas inlet of the tail gas collection tank is connected to the top gas outlet of the third reaction tank. The deep oil removal module includes an activated carbon tank, into which wastewater from the third reaction tank enters.

2. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1, characterized in that, The pretreatment module also includes an air flotation oil storage tank, a compressed air-ozone storage tank, and a dilute acid storage tank. The outlet of the compressed air-ozone storage tank is connected to the bottom gas inlet of the first reaction tank. The dilute acid storage tank is used to introduce dilute acid into the first reaction tank to adjust the pH value. The air flotation oil storage tank is used to collect oil from the surface of the wastewater in the first reaction tank.

3. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 2, characterized in that, The pretreatment module also includes an air compressor, the outlet of which is connected to the inlet of the compressed air-ozone storage tank, and the outlet of the exhaust gas collection tank is connected to the inlet of the air compressor, for providing ozone.

4. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1, characterized in that, The complex-breaking agent storage tank includes a first complex-breaking agent storage tank and a second complex-breaking agent storage tank. The first complex-breaking agent storage tank is used to introduce a first complex-breaking agent into the upper part of the second reaction tank, and the second complex-breaking agent storage tank is used to introduce a second complex-breaking agent into the lower part of the second reaction tank.

5. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1, characterized in that, The outlet of the precipitant storage tank is also connected to an upper inlet of the third reaction tank for introducing precipitant into the third reaction tank.

6. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1, characterized in that, The first solid-liquid separator includes a plate and frame filter press.

7. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1, characterized in that, The deep oil removal module also includes a second solid-liquid separator, which is installed on the pipeline between the third reaction tank and the activated carbon tank.

8. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 7, characterized in that, The second solid-liquid separator includes a filter.

9. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 1 or 7, characterized in that, The deep oil removal module also includes a recycled water storage tank, and the outlet of the activated carbon tank is connected to the inlet of the recycled water storage tank.

10. The treatment apparatus for organic wastewater containing complexed nickel and phosphorus according to claim 9, characterized in that, The outlet of the recycled water storage tank is independently connected to the complex-breaking agent storage tank, the flocculant storage tank, and the precipitant storage tank.

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