Wastewater treatment equipment

Abstract

The utility model provides wastewater treatment equipment for treating thallium-containing desulfurization wastewater. The wastewater treatment equipment comprises a box body, wherein a pretreatment unit, a biochemical treatment unit and an equipment unit are arranged in the box body; the pretreatment unit comprises a regulating tank, a reaction tank, a first sedimentation tank and a middle water tank which are sequentially connected; the biochemical treatment unit is arranged at the downstream of the pretreatment unit and comprises an AO tank and a biochemical treatment sedimentation tank which are connected in sequence; the equipment unit is arranged at the downstream of the biochemical treatment unit and comprises a water inlet pump, a water outlet pump, a sludge pump, a fan, a dosing device and electric control equipment. By optimizing the equipment layout, the functionality and the collaboration of the processing unit are improved, and the independence and the adjustability of the equipment unit are enhanced. The equipment unit is arranged at the downstream of the biochemical treatment unit, so that the overall structure is optimized, the operation efficiency and stability are improved, daily management and maintenance work are greatly facilitated, and powerful support is provided for effective treatment of thallium-containing desulfurization wastewater.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater treatment, and more specifically to a wastewater treatment device. Background Art

[0002] With the rapid development of industrial production, the problem of wastewater discharge has become increasingly prominent. Especially for thallium-containing desulfurization wastewater, due to the presence of heavy metal thallium and other harmful substances, if directly discharged into the environment without effective treatment, it will cause serious pollution and damage to water bodies, soil, and even the ecological system, affecting human health and ecological balance. Therefore, the development of efficient and stable wastewater treatment equipment has become an urgent need in the field of environmental protection.

[0003] Existing wastewater treatment equipment uses a combination of physical, chemical, and biological methods to remove pollutants in wastewater. However, when treating specific wastewater such as thallium-containing desulfurization wastewater, maintenance and management are inconvenient: wastewater treatment equipment usually includes multiple treatment units and a complex pipeline system, resulting in a large and cumbersome workload for daily management and maintenance. In traditional designs, equipment units may be scattered, which is not conducive to centralized management and rapid response to faults.

[0004] Therefore, it is necessary to provide a wastewater treatment device to at least partially solve the above problems. Summary of the Utility Model

[0005] A series of simplified concepts are introduced in the Summary of the Utility Model section, which will be further elaborated in the Detailed Implementation section. The Summary of the Utility Model section of the present utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present utility model provides a wastewater treatment device for treating thallium-containing desulfurization wastewater, including a box body, in which a pretreatment unit, a biochemical treatment unit, and an equipment unit are arranged;

[0007] The pretreatment unit includes an adjustment tank, a reaction tank, a first sedimentation tank, and an intermediate water tank connected in sequence;

[0008] The biochemical treatment unit is arranged downstream of the pretreatment unit and includes an AO tank and a biochemical treatment sedimentation tank connected in sequence;

[0009] The equipment unit is arranged downstream of the biochemical treatment unit and includes a feed water pump, a discharge water pump, a sludge pump, a blower, a chemical dosing device, and an electric control device.

[0010] The wastewater treatment equipment according to the present utility model realizes a more efficient, stable and economical wastewater treatment effect by optimizing the equipment layout, enhancing the functionality and synergy of the treatment units, and strengthening the independence and adjustability of the equipment units. The equipment unit is arranged downstream of the biochemical treatment unit, which not only optimizes the overall structure, improves the operation efficiency and stability, but also greatly facilitates the daily management and maintenance work, reduces the energy consumption and material consumption, and provides strong support for the effective treatment of thallium-containing desulfurization wastewater.

[0011] The reaction tank is connected to the overflow port of the regulating tank;

[0012] The first sedimentation tank is connected to the overflow port of the reaction tank;

[0013] The intermediate water tank is connected to the overflow port of the first sedimentation tank.

[0014] Optionally, the reaction tank includes a first reaction tank and a second reaction tank, and the bottom of the first reaction tank is connected to the bottom of the second reaction tank.

[0015] Optionally, the reaction tank is provided with stirring equipment.

[0016] Optionally, in the biochemical treatment unit, the biochemical treatment sedimentation tank is connected to the overflow port of the AO tank.

[0017] Optionally, the biochemical treatment sedimentation tank includes a flocculation tank and a second sedimentation tank, and the flocculation tank is connected to the AO tank.

[0018] Optionally, stirring equipment is provided in the flocculation tank.

[0019] Optionally, an aeration pipe is provided at the bottom of the AO tank, and the aeration pipe is connected to the blower; and / or fillers are provided in the AO tank.

[0020] Optionally, the bottoms of the first sedimentation tank and the biochemical treatment sedimentation tank are connected to the sludge tank through pipelines.

[0021] Optionally, the equipment unit satisfies at least one of the following conditions:

[0022] The inlet water pump is used to transport the wastewater into the regulating tank;

[0023] The outlet water pump is used to discharge the wastewater treated by the biochemical treatment unit out of the box body;

[0024] The sludge pump is used to discharge the sludge in the first sedimentation tank and / or the biochemical treatment sedimentation tank out of the box body;

[0025] The blower is used to supply oxygen to the AO tank;

[0026] The chemical dosing device is used to add chemicals to the reaction tank. Description of the Drawings

[0027] The following drawings of the embodiments of the present utility model are hereby taken as a part of the present utility model for understanding the present utility model. The embodiments and descriptions of the present utility model are shown in the drawings to explain the principle of the present utility model. In the drawings,

[0028] Figure 1 is a schematic diagram of a wastewater treatment device of the present utility model.

[0029] Description of reference numerals

[0030] 110: Regulation tank

[0031] 120: Reaction tank

[0032] 130: First sedimentation tank

[0033] 140: Intermediate water tank

[0034] 211: Aeration pipe

[0035] 221: Flocculation tank

[0036] 222: Second sedimentation tank

[0037] 310: Feed water pump

[0038] 320: Discharge water pump

[0039] 330: Sludge pump

[0040] 340: Blower

[0041] 350: Chemical dosing device

[0042] 360: Electric control equipment

[0043] 400: Clear water tank Detailed Embodiments

[0044] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the embodiments of the present utility model can be implemented without one or more of these details. In other examples, some well-known technical features are not described to avoid confusion with the embodiments of the present utility model.

[0045] In this text, the ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself.

[0046] In this text, "upper", "lower", "front", "rear", "left", "right", etc. are only used to represent the relative positional relationship between relevant parts, rather than defining the absolute positions of these relevant parts.

[0047] In this text, "equal", "same", etc. are not strict mathematical and / or geometric limitations, and also include errors that can be understood by those skilled in the art and are allowed in manufacturing or using, etc.

[0048] Unless otherwise specified, the numerical ranges in this text include not only the entire range within its two endpoints, but also several sub-ranges included therein.

[0049] Now, exemplary embodiments according to the present utility model will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present utility model is thorough and complete, and the concepts of these exemplary embodiments are fully conveyed to those of ordinary skill in the art.

[0050] Referring to Figure 1 , the present utility model provides a wastewater treatment device for treating thallium-containing desulfurization wastewater.

[0051] The wastewater treatment device includes a box body. A pretreatment unit, a biochemical treatment unit, and an equipment unit are arranged in the box body. Through the coordinated action of the pretreatment unit, the biochemical treatment unit, and the equipment unit, the wastewater treatment device realizes the effective treatment and purification of wastewater, improves the effluent quality, and reduces environmental pollution. Among them, the equipment unit provides the necessary power and auxiliary facilities for the entire wastewater treatment system to ensure the normal operation of the system. The equipment unit is separately arranged, which is conducive to the daily management and maintenance work of the staff. For example, it is more convenient to monitor the operation status of the equipment, adjust the operation parameters, and conduct fault troubleshooting and maintenance. Specifically, the equipment unit is arranged downstream of the biochemical treatment unit, optimizing the overall structure of the wastewater treatment device, improving the operation efficiency and stability of the wastewater treatment system, and thus reducing the operation costs such as energy consumption and material consumption.

[0052] In some cases, the equipment configuration or operation parameters in the equipment unit can be adjusted according to actual needs. Arranging the equipment unit downstream of the biochemical treatment unit can make this adjustment more flexible and convenient.

[0053] The wastewater treatment equipment provided by the present utility model is used for treating thallium-containing desulfurization wastewater. Currently, the research on the treatment methods of thallium-containing industrial wastewater (such as boiler or sintering flue gas desulfurization wastewater) mainly includes the following several types: one is to add sulfide in an alkaline environment, and through the action of corresponding biological agents such as corresponding bacteria, to form thallium sulfide Tl2S precipitate for Tl + ions. However, for industrial wastewater with complex water quality, it is difficult to meet the expected target requirements. Using various adsorption materials (such as activated carbon, etc.) or mineral materials (such as clay minerals) or using activated alumina and ion exchange method for adsorption separation, the former is difficult to be popularized and applied in the treatment of a large amount of thallium-containing wastewater due to unsatisfactory treatment effects, and the latter is difficult to be popularized and applied due to high costs. Other methods such as ultrafiltration method, reverse osmosis method and electrodialysis method, etc., are also difficult to be popularized and applied in actual industrial production due to high material costs and daily maintenance costs. And with the recycling of the treated thallium-containing industrial wastewater, the COD in the wastewater will continue to accumulate, which will also affect the removal effect of thallium and other heavy metals.

[0054] As Figure 1 shown, the pretreatment unit includes a regulating tank 110, a reaction tank 120, a first sedimentation tank 130, and an intermediate water tank 140 connected in sequence. Through a series of physical and chemical processes, the pretreatment unit effectively removes large particle impurities and suspended solids in the wastewater, preliminarily treats the wastewater, provides good water quality conditions for subsequent biochemical treatment, reduces the load of the biochemical treatment unit, and improves the efficiency of the entire wastewater treatment system.

[0055] The regulating tank 110 is used to receive and store wastewater. Through homogenization and equalization adjustment, the water quality and water volume of the wastewater tend to be stable. At the same time, substances that are insoluble in water and have a relatively large specific gravity can be removed, providing stable influent conditions for subsequent treatment.

[0056] The reaction tank 120 can remove part of the COD that is insoluble in water, such as suspended organic matter and colloidal organic matter. The reaction process in the reaction tank 120 can remove pollutants such as heavy metals and part of the organic matter. The reagent reacts with heavy metals to form flocculent precipitates, making the heavy metals in the wastewater transfer from the liquid to the solid. The coagulant aids form larger flocs with impurities such as suspended solids and colloids, which is convenient for subsequent precipitation removal.

[0057] The first sedimentation tank 130 uses the gravity action to precipitate the flocs formed in the reaction tank 120, and at the same time removes heavy metals and part of the COD.

[0058] The intermediate water tank 140 serves as a buffer between the pretreatment unit and the biochemical treatment unit, further adjusting the water quality and water volume, and preparing for subsequent biochemical treatment.

[0059] Among them, in the pretreatment unit, the reaction tank 120 is connected to the overflow port of the regulation tank 110. The first sedimentation tank 130 is connected to the overflow port of the reaction tank 120. The intermediate water tank 140 is connected to the overflow port of the first sedimentation tank 130. The connection between each treatment unit through the overflow port can achieve the continuous flow and treatment of wastewater. When the wastewater completes the predetermined treatment goal in a certain treatment unit, it will automatically flow into the next treatment unit through the overflow port without additional power equipment, thus forming a continuous and stable treatment process, simplifying the process flow, and reducing energy consumption and operating costs.

[0060] Optionally, the overflow liquid level height of the regulation tank 110 is higher than that of the reaction tank 120 to ensure that the influent flow can be buffered and regulated during peak flow to avoid overloading of subsequent treatment units. The overflow liquid level height of the reaction tank 120 is higher than that of the first sedimentation tank 130 to ensure the reaction efficiency and prevent overflow to unexpected areas. The overflow liquid level height of the first sedimentation tank 130 is equal to that of the intermediate water tank 140 to maintain the hydraulic balance and continuous operation within the system.

[0061] Optionally, the reaction tank 120 includes a first reaction tank 121 and a second reaction tank 122, and the bottom of the first reaction tank 121 is connected to the bottom of the second reaction tank 122. The design of connecting the bottoms of the first reaction tank 121 and the second reaction tank 122 makes the entire reaction area more compact and saves floor space.

[0062] Optionally, the reaction tank 120 is provided with stirring equipment. Specifically, stirring equipment is provided in both the first reaction tank 121 and the second reaction tank 122. The stirring equipment can effectively promote the mixing of wastewater and the added chemicals, ensure the uniform distribution of the chemicals in the wastewater, contribute to the full contact between the chemicals and the pollutants in the wastewater, and improve the reaction efficiency.

[0063] The biochemical treatment unit is arranged downstream of the pretreatment unit. The biochemical treatment unit includes an AO tank 210 and a biochemical treatment sedimentation tank connected in sequence. The above-mentioned pretreatment unit removes some suspended solids, precipitates, etc. by physical and chemical methods, providing more favorable conditions for biochemical treatment. So that the wastewater has better biodegradability when entering the AO tank 210, which is beneficial to the progress of biochemical reactions.

[0064] The AO tank 210 is the core part of the biochemical treatment unit. Through the alternating action of anaerobic and aerobic environments, the effective degradation of organic pollutants is achieved. In the anaerobic section, anaerobic bacteria decompose macromolecular organic matter into small-molecular organic matter; in the aerobic section, aerobic bacteria use oxygen to further oxidize and decompose the small-molecular organic matter into harmless substances such as carbon dioxide and water. This process can significantly reduce the COD concentration in the wastewater. The AO tank 210 also has the function of nitrogen and phosphorus removal, and removes nitrogen, phosphorus and other nutrients in the wastewater through biological action, further improving the effluent quality.

[0065] The AO tank 210 adopts an efficient fixed-bed multi-stage AO tank 210. The efficient fixed-bed multi-stage AO tank 210 is provided with a water distribution device, a fixed biological bed filler, and an aeration pipe 211 at the bottom. The water distribution device, the fixed biological bed filler, and the bottom aeration pipe 211 in the efficient fixed-bed multi-stage AO tank 210 cooperate together to achieve uniform distribution, efficient degradation, and stable treatment of wastewater. The water distribution device can make the water flow into the AO tank 210 evenly and stably. The aeration pipe 211 introduces air or oxygen into the multi-stage AO tank 210. The bubbles generated during the aeration process can drive the mixing of water flow and sludge, thereby enhancing the contact effect between wastewater and microorganisms. The aeration pipe 211 is connected to the blower 340. Optionally, multiple blowers 340 are provided to ensure the aeration volume of the aeration pipe 211.

[0066] The biochemical treatment sedimentation tank includes a flocculation tank 221 and a second sedimentation tank 222, and the flocculation tank 221 is connected to the AO tank 210.

[0067] By adding a flocculant in the flocculation tank 221, pollutants such as suspended particles and colloids in the wastewater are coagulated into larger flocs with each other, enhancing the sedimentability of the pollutants. The flocs are easy to separate from the water during the subsequent sedimentation process, thereby achieving the physical removal of COD.

[0068] Optionally, the flocculation tank 221 is connected to the overflow port of the AO tank 210. Connecting the flocculation tank 221 to the AO tank 210 through the overflow port can ensure the smooth transition of the water flow between the two.

[0069] Optionally, a stirring device is provided in the flocculation tank 221. The stirring device can accelerate the flocculation reaction, enabling a large number of flocs to be formed in a short time, which helps to shorten the time of the entire sewage treatment process and improve the treatment efficiency.

[0070] The second sedimentation tank 222 is located downstream of the flocculation tank 221. The main function of the second sedimentation tank 222 is to perform solid-liquid separation, that is, to remove the flocs and other suspended substances formed in the flocculation tank 221 from the wastewater. Through the gravity sedimentation effect, the flocs and other suspended substances in the water gradually settle to the bottom of the sedimentation tank to form sludge. This process further reduces the COD concentration in the wastewater.

[0071] The bottoms of the first sedimentation tank 130 and the second sedimentation tank 222 are connected to the sludge tank through pipelines. Optionally, the sludge tank is arranged outside the box. Concentrating and returning the sludge from the first sedimentation tank 130 and the second sedimentation tank 222 to the sludge tank for unified treatment and management simplifies the sludge treatment process and reduces the management difficulty. Optionally, the sludge is further concentrated and discharged in the sludge tank.

[0072] After the wastewater is treated by the biochemical treatment unit, it is stored in the clear water tank.

[0073] The equipment unit is arranged downstream of the biochemical treatment unit. Further, the equipment unit is arranged downstream of the clear water tank. The equipment unit includes a feed water pump 310, a discharge water pump 320, a sludge pump 330, a blower 340, a chemical dosing device 350 and an electric control equipment 360. Each equipment unit within the equipment unit is relatively independent, making it easy to maintain, repair and replace. This modular design not only improves the maintainability of the equipment, but also helps to reduce the maintenance cost and time.

[0074] The feed water pump 310 is used to transport the wastewater into the regulating tank 110. The feed water pump 310 transports the wastewater to the regulating tank 110 efficiently and stably, providing a stable water flow for subsequent treatment.

[0075] The discharge water pump 320 is used to discharge the wastewater treated by the biochemical treatment unit outside the box. Specifically, the discharge water pump 320 is connected to the clear water tank 400. The discharge water pump 320 timely discharges the qualified wastewater treated by the biochemical treatment unit from the system, ensuring the smooth progress of the treatment process.

[0076] The sludge pump 330 is used to discharge the sludge in the first sedimentation tank 130 and the second sedimentation tank 222 outside the box. The sludge pump 330 regularly discharges the sludge outside the box to prevent excessive sludge accumulation from affecting the treatment effect, and at the same time facilitates the subsequent treatment and disposal of the sludge. It can be understood that the sludge pump 330 is set in two groups, and the two groups of sludge pumps 330 are respectively arranged corresponding to the first sedimentation tank 130 and the second sedimentation tank 222.

[0077] The blower 340 is used to supply oxygen to the AO tank 210. The blower 340 provides sufficient oxygen for the AO tank 210 (anoxic / aerobic tank), supports the growth and activities of aerobic microorganisms, thereby enhancing the degradation ability of organic matter and improving the treatment efficiency.

[0078] The chemical dosing device 350 is used to add chemicals to the reaction tank 120. The chemical dosing device 350 adds appropriate chemicals (such as flocculants, pH regulators, etc.) to the reaction tank 120 according to the treatment needs, promotes the coagulation, precipitation or transformation of pollutants, and further improves the treatment effect.

[0079] The electric control equipment 360 conducts automatic and intelligent control over the entire sewage treatment system, including the start and stop of equipment, the adjustment of operation parameters, etc. This can not only reduce the complexity and labor intensity of manual operation, but also improve the stability and reliability of the system, ensuring the consistency and continuity of the treatment effect.

[0080] Example 1

[0081] The thallium-containing desulfurized wastewater in the lithium mica desulfurization tower of a certain lithium industry company has been circulating without treatment, resulting in a large enrichment of pollutants. The thallium concentration is 330 μg / L, the arsenic concentration is 200 mg / L, the COD is 12,000 mg / L, the pH is 7.8, the conductivity is 5.2 ms / cm, and the wastewater treatment volume is 100 m 3 / d.

[0082] Pretreatment unit: The regulating tank 110 is designed for 1 h, the reaction tank 120 in the heavy metal removal unit is designed with a reaction time of 20 min, and the sedimentation time is designed for 40 min.

[0083] Biochemical unit: The high-efficiency fixed-bed multi-stage AO tank 210 is provided with fixed packing. The empty bed residence time is 4.8 h; the effective water depth is 2.2 m; the anoxic zone: aerobic zone = 1:1; the sedimentation surface load of the coagulation sedimentation tank is 1.5 m 3 / m 2 ·h.

[0084] The wastewater is first treated by the heavy metal pretreatment unit in the integrated equipment to reduce the heavy metals in the water to a certain concentration, and then the biochemical unit is debugged. After the wastewater is circulated and treated by the biochemical unit in the equipment, the organic matter will not accumulate continuously, so that the heavy metals in the treated wastewater will not still fail to meet the standards. After the wastewater is circulated and treated by the integrated equipment, the chemical oxygen demand of the effluent ≤ 200 mg / L, the arsenic concentration ≤ 0.5 mg / L, and the thallium concentration ≤ 5 μg / L.

[0085] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field of the present utility model. The terms used herein are only for the purpose of describing specific implementation purposes and are not intended to limit the present utility model. Terms such as "provided" that appear herein can either mean that one component is directly attached to another component or that one component is attached to another component through an intermediate component. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0086] The present utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present utility model within the scope of the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teachings of the present utility model, and these variations and modifications all fall within the scope of protection required by the present utility model.

Claims

1. A wastewater treatment device for treating thallium-containing desulfurized wastewater, characterized in that, It includes a box body, in which a pretreatment unit, a biochemical treatment unit and an equipment unit are arranged; The pretreatment unit includes an adjustment tank, a reaction tank, a first sedimentation tank and an intermediate water tank connected in sequence; The biochemical treatment unit is arranged downstream of the pretreatment unit, and the biochemical treatment unit includes an AO tank and a biochemical treatment sedimentation tank connected in sequence; The equipment unit is arranged downstream of the biochemical treatment unit, and the equipment unit includes a feed water pump, a discharge water pump, a sludge pump, a blower, a chemical dosing device and an electric control equipment.

2. The wastewater treatment equipment according to claim 1, characterized in that, In the pretreatment unit, The reaction tank is connected to the overflow port of the adjustment tank; The first sedimentation tank is connected to the overflow port of the reaction tank; The intermediate water tank is connected to the overflow port of the first sedimentation tank.

3. The wastewater treatment equipment according to claim 1 or 2, characterized in that, The reaction tank includes a first reaction tank and a second reaction tank, and the bottom of the first reaction tank is communicated with the bottom of the second reaction tank.

4. The wastewater treatment equipment according to claim 3, characterized in that, The reaction tank is provided with stirring equipment.

5. The wastewater treatment equipment according to claim 1, characterized in that, In the biochemical treatment unit, the biochemical treatment sedimentation tank is connected to the overflow port of the AO tank.

6. The wastewater treatment equipment according to claim 1 or 5, characterized in that, The biochemical treatment sedimentation tank includes a flocculation tank and a second sedimentation tank, and the flocculation tank is connected to the AO tank.

7. The wastewater treatment equipment according to claim 6, characterized in that, Stirring equipment is arranged in the flocculation tank.

8. The wastewater treatment equipment according to claim 1, characterized in that, An aeration pipe is arranged at the bottom of the AO tank, and the aeration pipe is connected to the blower; and / or fillers are arranged in the AO tank.

9. The wastewater treatment equipment according to claim 1, characterized in that, The bottoms of the first sedimentation tank and the biochemical treatment sedimentation tank are connected to a sludge tank through pipelines.

10. The wastewater treatment equipment according to claim 1, characterized in that, The equipment unit satisfies at least one of the following conditions: The feed water pump is used to convey wastewater into the adjustment tank; The discharge water pump is used to discharge the wastewater treated by the biochemical treatment unit out of the box body; The sludge pump is used to discharge the sludge in the first sedimentation tank and / or the biochemical treatment sedimentation tank out of the box body; The blower is used to supply oxygen to the AO tank; The chemical dosing device is used to add chemicals into the reaction tank.

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