High-salinity wastewater softening and hardness removing device system

Abstract

The utility model provides a softening and hardness-removing device system for high-salinity wastewater. The device system comprises a reaction unit, a dosing unit and a central control unit, the reaction unit comprises a water inlet pipeline, a precipitation reactor and a water outlet pipeline which are connected in sequence; the water inlet pipeline is provided with a first detection module, the precipitation reactor comprises a plurality of purification monomers, each purification monomer is provided with a second detection module, the water outlet pipeline is provided with a third detection module, and the first detection module, the second detection module and the third detection module are used for detecting the quality of wastewater; the chemical adding unit is used for providing chemicals for the purification monomers; the central control unit is electrically connected with the first detection module, the second detection module, the third detection module and the dosing unit respectively. According to the high-salinity wastewater softening and hardness removing device, efficient and convenient softening and hardness removing of high-salinity wastewater are realized through accurate dosing control.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-salt wastewater and relates to a high-salt wastewater softening and hardness removal device system. Background Art

[0002] During the development of oil and gas fields, especially unconventional shale oil and gas development, a large amount of drilling mud filtrate and fracturing flowback fluid will be generated. Drilling mud filtrate and fracturing flowback fluid have complex components and are discharged intermittently with large fluctuations. After being collected, they are usually transported to centralized waste disposal plants through pipelines or vehicles for unified disposal.

[0003] Drilling mud filtrate and fracturing flowback fluid are associated water produced along with drilling, including formation water and water injected during the fracturing process. They are characterized by high COD (Chemical Oxygen Demand) concentration (3000-8000 mg / L), high total dissolved solids concentration (20000-80000 us / cm), and high hardness (3000-20000 mg / L). They are typical high-salt, high-hardness, and high-COD wastewater, which is extremely difficult to treat.

[0004] At present, the traditional treatment process of drilling mud filtrate and fracturing flowback fluid is: oil removal, hardness removal, COD removal and membrane treatment. Among them, the existing hardness removal treatment is mainly controlled by dosing adjustment in the following two ways: (1) by constantly testing the calcium and magnesium content, using the following chemical equation to calculate the required dosage and adjust the dosage; (2) directly determining the dosage by on-site beaker experiment and adjusting the dosage.

[0005] Mg 2+ +Ca(OH)2→Mg(OH)2↓+Ca 2+ ;

[0006] Ca 2+ +Na2CO3→CaCO3↓+2Na + ;

[0007] However, it is difficult to implement the above two methods to control and adjust the hardness removal of drilling mud filtrate and fracturing return fluid. This is mainly because in the actual wastewater collection process, the types of wastewater are different and it is impossible to achieve effective homogenization. The existing technology has lags, which will cause the hardness removal system to collapse and even the entire system cannot operate normally.

[0008] Therefore, how to quickly and effectively control the dosage during the hardness removal process of high-salt and high-hardness wastewater to improve the softening and hardness removal effect is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0009] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-salinity wastewater softening and hardness removal device system, which achieves efficient and convenient high-salinity wastewater softening and hardness removal through precise dosing control.

[0010] To achieve this purpose, the utility model adopts the following technical solutions:

[0011] The utility model provides a high-salinity wastewater softening and hardness removal device system, the device system comprises a reaction unit, a dosing unit and a central control unit; the reaction unit comprises an inlet pipe, a sedimentation reactor and an outlet pipe which are connected in sequence; a first detection module is arranged on the inlet pipe, the sedimentation reactor comprises a plurality of purification monomers, the purification monomers are provided with a second detection module, the outlet pipe is provided with a third detection module, the first detection module, the second detection module and the third detection module are used for detecting the quality of the wastewater; the dosing unit is used for providing agents to the purification monomers; the central control unit is electrically connected to the first detection module, the second detection module, the third detection module and the dosing unit respectively.

[0012] As a preferred technical solution of the utility model, the first detection module includes a first pH detection component and a first conductivity detection component arranged on the water inlet pipe, which are used to detect the pH value and conductivity of the wastewater inlet, respectively.

[0013] The first pH detection component and the first conductivity detection component are independently and electrically connected to the central control unit, and are used to transmit the pH value and conductivity of the wastewater inlet to the central control unit.

[0014] As a preferred technical solution of the utility model, a plurality of the purification units include a magnesium removal device, a calcium removal device and a flocculation device which are connected in sequence.

[0015] The dosing unit includes a first dosing device, a second dosing device and a third dosing device. The first dosing device is connected to the magnesium removal device, the second dosing device is connected to the calcium removal device, and the third dosing device is connected to the flocculation device. The first dosing device, the second dosing device and the third dosing device independently include a dosing pump and a drug source.

[0016] The dosing pumps of the first dosing device and the second dosing device are both variable frequency dosing pumps, and the variable frequency dosing pumps are electrically connected to the central control unit.

[0017] As a preferred technical solution of the present utility model, the second detection module includes a second pH detection component, a third pH detection component and a second conductivity detection component; the second pH detection component is connected to the magnesium removal device, the third pH detection component is connected to the calcium removal device, and the second conductivity detection component is connected to the flocculation device; the second pH detection component, the third pH detection component and the second conductivity detection component are independently electrically connected to the central control unit.

[0018] As a preferred technical solution of the utility model, a flow detection component is further provided at the outlet end of the second dosing device, and the flow detection component is electrically connected to the central control unit.

[0019] As a preferred technical solution of the utility model, a first stirring component is provided in the magnesium removal device.

[0020] A second stirring component is arranged in the decalcification device.

[0021] A third stirring component is arranged in the flocculation device.

[0022] As a preferred technical solution of the utility model, several of the purification units also include a maturation device, a sedimentation device, a neutralization device and a buffer device connected in sequence, the water inlet end of the maturation device is connected to the flocculation device, and the water outlet end of the buffer device is connected to the water outlet pipe.

[0023] As a preferred technical solution of the utility model, the dosing unit also includes a fourth dosing device, the fourth dosing device is connected to the neutralization device, the fourth dosing device includes a dosing pump and a drug source, and the dosing pump is electrically connected to the central control unit.

[0024] As a preferred technical solution of the present utility model, the second detection module further includes a fourth pH detection component connected to the buffer device, and the fourth pH detection component is electrically connected to the central control unit.

[0025] A fourth stirring component is arranged in the neutralization device.

[0026] As a preferred technical solution of the present utility model, the third detection module includes a hardness detection component arranged on the outlet pipe, which is used to detect the outlet water hardness of the wastewater.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] The utility model provides a high-salt wastewater softening and hardness removal device system, which accurately adjusts the dosing frequency based on the inlet water quality and the outlet water hardness to ensure efficient and stable operation of the system, meeting the softening and hardness removal requirements of high-salt wastewater, has a simple process, low cost, simple equipment maintenance, is environmentally friendly, and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the high-salinity wastewater softening and hardness removal device system provided in Example 1 of the utility model.

[0030] Among them, 1-water inlet pipe; 101-first pH detection component; 102-first conductivity detection component; 2-magnesium removal reaction tank; 201-second pH detection component; 202-first stirring component; 3-calcium removal reaction tank; 301-third pH detection component; 302-second stirring component; 4-flocculation tank; 401-second conductivity detection component; 402-third stirring component; 5-maturation tank; 6-sedimentation tank; 7-neutralization reaction tank; 701-fourth stirring component; 8-buffer tank; 801-fourth pH detection component; 9-water outlet pipe; 901-hardness detection component; 10-first dosing device; 11-second dosing device; 111-flow detection component; 12-third dosing device; 13-fourth dosing device. DETAILED DESCRIPTION

[0031] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0032] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not constitute the main improvement of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements or specific limitations on this.

[0034] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] In a specific embodiment, the utility model provides a high-salinity wastewater softening and hardness removal device system, the device system includes a reaction unit, a dosing unit and a central control unit; the reaction unit includes an inlet pipe, a sedimentation reactor and an outlet pipe connected in sequence; the inlet pipe is provided with a first detection module, the sedimentation reactor includes a plurality of purification units, the purification unit is provided with a second detection module, the outlet pipe is provided with a third detection module, the first detection module, the second detection module and the third detection module are used to detect the quality of the wastewater; the dosing unit is used to provide a reagent to the purification unit; the central control unit is electrically connected to the first detection module, the second detection module, the third detection module and the dosing unit respectively. The first detection module obtains the quality of the wastewater inlet and transmits it to the central control unit; the second detection module obtains the quality of the wastewater in the purification unit and transmits it to the central control unit; the third detection module obtains the quality of the wastewater outlet and transmits it to the central control unit; the central control unit feedback controls the dosing of the dosing unit based on the analysis of the quality of the outlet, the quality of the inlet and the quality of the wastewater in the purification unit.

[0036] The central control unit of the utility model serves as a terminal for the operation and online detection of the reaction unit and the dosing unit, and may include a main control device, and necessary connecting wires for connecting each reaction unit, the dosing unit, the first detection module, the second detection module, and the third detection module, etc., to establish a complete communication network. The main control device can electrically connect the reaction unit and the dosing unit through the hardware and software and electromechanical control technology familiar to those skilled in the art to achieve remote control. In order to facilitate the staff to grasp the operation of the system, the main control device can also be provided with a display and an operation interface, etc., which is not specifically limited in the utility model, and the technicians in this field need to reasonably adjust, add or delete according to the actual production needs.

[0037] In some embodiments, the first detection module includes a first pH detection component and a first conductivity detection component disposed on the water inlet pipe, respectively used to detect the pH value and conductivity of the wastewater inlet. The first pH detection component and the first conductivity detection component are independently electrically connected to the central control unit to transmit the acidity and conductivity of the wastewater inlet to the central control unit.

[0038] In some embodiments, several of the purification units include a magnesium removal device, a calcium removal device and a flocculation device connected in sequence. During the application of the utility model, the wastewater flows into the magnesium removal device from the water inlet pipe, and reacts with the added agent to form a precipitate to remove the magnesium ions in the wastewater; the wastewater flowing into the calcium removal device reacts with the added agent to form a precipitate to remove the calcium ions in the wastewater; the agents originally added to the wastewater in the flocculation device interact with each other, so that the colloids, precipitates and tiny suspended solids in the wastewater are aggregated and removed. The utility model does not make special requirements for the structure and size of the magnesium removal device, the calcium removal device and the flocculation device, and can adopt the wastewater treatment device commonly used in the art, and the size of the treatment device can be adjusted according to the wastewater treatment amount. In order to improve the wastewater treatment effect, the utility model is also provided with a reflux pipe, one end of which is connected to the outlet pipe, and the other end is connected to the magnesium removal device or the calcium removal device. When it is detected that the outlet water quality does not meet the requirements, the wastewater is returned to the magnesium removal device or the calcium removal device through the reflux pipe to further remove the hardness and soften until the discharge requirements are met.

[0039] The dosing unit includes a first dosing device, a second dosing device and a third dosing device. The first dosing device is connected to the magnesium removal device, the second dosing device is connected to the calcium removal device, and the third dosing device is connected to the flocculation device. The first dosing device, the second dosing device and the third dosing device each independently include a dosing pump and a drug source. The dosing pumps of the first dosing device and the second dosing device are both variable frequency dosing pumps, and the variable frequency dosing pumps are electrically connected to the central control unit. The first dosing device is used to provide a hardening agent to the magnesium removal device, the second dosing device is used to provide a softening agent to the calcium removal device, and the third dosing device is used to provide a flocculation agent to the flocculation device. The dosing pumps of the first dosing device, the second dosing device and the third dosing device are used to pump the drug from the drug source into the corresponding purification monomer. The dosing pump of the third dosing device can be a variable frequency dosing pump or a conventional pump. The technicians in this field adjust the adjustment unit of the variable frequency dosing pump according to the actual operation conditions, preferably controlling and adjusting with 3Hz or 5Hz as an adjustment unit, so as to achieve full automatic operation. In addition, the above-mentioned dosing device also includes necessary connecting pipelines and switch control valves. The present invention does not make special limitations on this. Technical personnel in this field need to reasonably adjust, add or delete according to actual production needs. It should be clear that new technical solutions generated by deleting some unnecessary connecting pipelines and switch control valves, or replacing single-function switch control valves with multi-function integrated control valves and other conventional technical means commonly used and well-known by technical personnel in this field also fall within the scope of disclosure and protection of the present invention.

[0040] In some embodiments, the second detection module includes a second pH detection component, a third pH detection component and a second conductivity detection component; the second pH detection component is connected to the magnesium removal device, the third pH detection component is connected to the calcium removal device, and the second conductivity detection component is connected to the flocculation device; the second pH detection component, the third pH detection component and the second conductivity detection component are independently electrically connected to the central control unit.

[0041] In some embodiments, the outlet of the second dosing device is further provided with a flow detection component, which is electrically connected to the central control unit to monitor whether the dosing flow is normal. The utility model does not specifically limit the selection of the flow detection component, which can be an electromagnetic flowmeter or other forms of flowmeter.

[0042] In some embodiments, the magnesium removal device is provided with a first stirring component, the calcium removal device is provided with a second stirring component, and the flocculation device is provided with a third stirring component. When the utility model is in operation, the wastewater is stirred to make the wastewater and the added agent fully mixed and reacted, thereby improving the treatment effect.

[0043] In some embodiments, several of the purification units further include a maturation device, a sedimentation device, a neutralization device and a buffer device connected in sequence, the water inlet end of the maturation device is connected to the flocculation device, and the water outlet end of the buffer device is connected to the outlet pipe. In the utility model, the wastewater discharged from the flocculation device enters the maturation device, and then flows into the sedimentation device, so that pollutants such as sediment, colloid, and suspended matter in the wastewater are precipitated and removed, and the sewage sludge is discharged from the bottom of the sedimentation device, and the purified water enters the neutralization device for further neutralization treatment. The wastewater flowing into the neutralization device reacts with the added agent to neutralize the acid and alkali of the wastewater, and then enters the buffer device. After the wastewater quality meets the treatment requirements, it flows out from the outlet pipe. The utility model does not make special requirements for the structure and size of the maturation device, sedimentation device, neutralization device and buffer device. The wastewater treatment device commonly used in the field can be used, and the size of the treatment device can be adjusted according to the wastewater treatment volume.

[0044] In some embodiments, the dosing unit further includes a fourth dosing device, the fourth dosing device is connected to the neutralization device, the fourth dosing device includes a dosing pump and a drug source, the dosing pump is electrically connected to the central control unit. The dosing pump can be a variable frequency pump or a conventional pump, and its on / off and opening degree can be remotely controlled by the central control unit.

[0045] In some embodiments, the second detection module further includes a fourth pH detection component connected to the buffer device, the fourth pH detection component is electrically connected to the central control unit, and is used to detect the quality of wastewater in the buffer device, thereby adjusting the dosage in the neutralization device. Preferably, a fourth stirring component is provided in the neutralization device.

[0046] Furthermore, in order to improve the softening effect of wastewater, the dosing unit further includes a fifth dosing device, which is connected to the decalcification device and is used to provide a water purifier to the decalcification device. The water purifier includes at least one of polyacrylamide, polyferric sulfate or polyaluminium chloride commonly used in the art.

[0047] In some embodiments, the third detection module includes a hardness detection component disposed on the outlet pipe, which is used to detect the outlet hardness of the wastewater. During operation, the utility model detects the outlet hardness of the wastewater in the outlet pipe at regular intervals. When the outlet hardness meets the requirements, the system can be discharged. When the outlet water fails to meet the hardness requirements, the central control unit feedback control is used to adjust the dosing situation in the precipitation reactor.

[0048] Specifically, the precipitation reactor includes an inclined tube reactor, a high-density reactor or a vertical flow reactor. The utility model does not specifically limit the layout of the purified monomer in the precipitation reactor, and those skilled in the art can reasonably adjust it according to actual production needs.

[0049] The utility model exemplarily provides the following specific structure of the precipitation reactor: the precipitation reactor is composed of a magnesium removal reaction tank, a calcium removal reaction tank, a flocculation tank, a maturation tank, a sedimentation tank, a neutralization reaction tank and a buffer tank connected in sequence, and is supported and fixed by a frame. A first water outlet is provided at the bottom of the magnesium removal reaction tank, which is connected to the middle of the calcium removal reaction tank; a first overflow port is provided at the upper part of the calcium removal reaction tank, which is connected to the upper part of the flocculation tank; a second water outlet is provided at the bottom of the flocculation tank, which is connected to the bottom of the maturation tank; a second overflow port is provided at the upper part of the maturation tank, which is connected to the sedimentation tank; at least two mud discharge buckets are provided at the bottom of the sedimentation tank for discharging sludge; a drainage assembly is provided at the upper part of the sedimentation tank, which is connected to the neutralization reaction tank and is used to discharge purified water into the neutralization reaction tank; a third water outlet is provided at the bottom of the neutralization reaction tank, which is connected to the buffer tank, and the bottom of the buffer tank is connected to the outlet pipe. In order to further improve the purification effect, multiple baffles can be provided in the sedimentation tank to extend the wastewater retention time. It should be noted that the above description of the structure of each purification monomer does not constitute a further limitation on the protection scope of the present utility model, that is, each purification monomer disclosed in the prior art or not disclosed in the new technology can be used in the present utility model, and is not limited to the operating module with the above structure. As long as the purification monomer can achieve the same or similar functions, it can be replaced arbitrarily, and the technical solution obtained after the replacement also falls within the protection scope and disclosure scope of the present utility model.

[0050] In another specific embodiment, the utility model provides a method for softening and removing hardness of wastewater using the high-salinity wastewater softening and hardness removal device system described in a specific embodiment, specifically comprising:

[0051] Injecting wastewater into the reaction unit through the water inlet pipe, and adding reagents into the reaction unit to purify the wastewater;

[0052] Obtaining the pH value and / or conductivity of the wastewater inlet and the wastewater in the reaction unit;

[0053] Adjust the dosing frequency of the reagents added to the reaction unit according to the water quality of the wastewater inlet and the wastewater in the reaction unit;

[0054] Detect the effluent water quality of the wastewater to determine whether the effluent water quality reaches the target water quality. If not, adjust the dosing frequency of adding reagents to the reaction unit according to the pH value and / or conductivity of the wastewater in the reaction unit.

[0055] The high-salt wastewater described in the utility model refers to wastewater with a COD concentration of 3000-8000 mg / L, a total dissolved solid concentration of 20000-80000 us / cm, and a hardness of 3000-20000 mg / L, which is difficult to treat. For the above-mentioned wastewater, the utility model realizes efficient and convenient wastewater softening and hardness removal through precise dosing control.

[0056] Specifically, the softening and hardening method comprises the following steps:

[0057] S1: sending the wastewater to the magnesium removal device, the calcium removal device and the flocculation device in sequence through the water inlet pipe, adding a hardness removal agent to the magnesium removal device, adding a softening agent to the calcium removal device, and adding a flocculation agent to the flocculation device;

[0058] S2: Obtain the first pH value of the influent wastewater and the second pH value of the wastewater in the magnesium removal device, monitor the change of the influent water quality in real time through the first pH value, set the acid-base threshold, analyze and compare the second pH value with the acid-base threshold, and adjust the dosing frequency of the hardness removal agent according to the analysis results;

[0059] S3: obtaining the first conductivity of the wastewater inlet and the second conductivity of the wastewater in the flocculation device, and setting the collection time, and detecting the hardness of the wastewater outlet at each collection time interval;

[0060] S4: Determine whether the effluent water quality exceeds the target hardness range. If so, adjust and increase the dosing frequency of the softening agent. Otherwise, determine whether the difference between the first conductivity and the second conductivity is greater than the purification threshold.

[0061] When the difference is greater than the purification threshold, the frequency of adding the softening agent is adjusted to be reduced; when the difference is less than or equal to the purification threshold, the frequency of adding the softening agent remains unchanged.

[0062] Furthermore, the high-salinity wastewater softening and hardness removal method further includes: obtaining a third pH value of the wastewater in the decalcification device, and monitoring the dosage of the softening agent in real time through the third pH value. That is, the utility model monitors the wastewater quality in the decalcification device according to the change of the third pH value, and controls the dosage and the start and stop of the dosage.

[0063] Specifically, the de-hardening agent includes lime or liquid caustic soda. The softening agent is sodium carbonate. The flocculating agent includes at least one of polyacrylamide, polyferric sulfate or polyaluminium chloride. It should be noted that all of the above agents are commonly used in the art for wastewater purification.

[0064] In some embodiments, the acid-base threshold is 11 to 11.7, the collection time is 30 to 60 minutes, the target hardness range is 0 to 300 mg / L, and the purification threshold is 1800 to 2000 us / cm.

[0065] In some embodiments, the high-salinity wastewater softening and hardness removal method further comprises:

[0066] The wastewater discharged from the flocculation device is sequentially sent to the maturation device, the sedimentation device, the neutralization device and the buffer device for discharge, and a neutralizing agent is added to the neutralization device;

[0067] The fourth pH value of the wastewater in the buffer device is obtained, and it is determined whether the fourth pH value exceeds the target pH range, so as to adjust the dosage of the neutralizing agent.

[0068] When the second pH value or the third pH value exceeds the respective target pH range, the start or stop or opening of the dosing pump of the second dosing device and / or the third dosing device can be controlled to adjust the dosage. The target pH range of the wastewater in the buffer device is 6 to 7. When the fourth pH value exceeds the above range, the dosage of the neutralizing agent provided by the fourth dosing device to the neutralization device can be adjusted. Furthermore, the dosage can be adjusted by adjusting the start or stop or opening of the dosing pump of the fourth dosing device. Specifically, the neutralizing agent includes at least one of hydrochloric acid, hydrochloric acid or sulfuric acid.

[0069] Example 1

[0070] This embodiment provides a high-salinity wastewater softening and hardness removal device system, including a reaction unit, a dosing unit and a central control unit. The reaction unit includes an inlet pipe 1, a precipitation reactor and an outlet pipe 9 connected in sequence. Figure 1 As shown, the water inlet pipe 1 is provided with a first pH detection component 101 and a first conductivity detection component 102, which are used to detect the acidity and conductivity of the wastewater inlet, respectively, and the first pH detection component 101 and the first conductivity detection component 102 are independently electrically connected to the central control unit, and are used to transmit the acidity and conductivity of the wastewater inlet to the central control unit. The water outlet pipe 9 is provided with a hardness detection component 901, which is electrically connected to the central control unit, and is used to detect the outlet hardness of the wastewater outlet.

[0071] The precipitation reactor is composed of a magnesium removal reaction tank 2, a calcium removal reaction tank 3, a flocculation tank 4, a maturation tank 5, a sedimentation tank 6, a neutralization reaction tank 7 and a buffer tank 8 which are connected in sequence. A first water outlet is provided at the bottom of the magnesium removal reaction tank 2, which is connected to the middle of the calcium removal reaction tank 3; a first overflow port is provided at the upper part of the calcium removal reaction tank 3, which is connected to the upper part of the flocculation tank 4; a second water outlet is provided at the bottom of the flocculation tank 4, which is connected to the bottom of the maturation tank 5; a second overflow port is provided at the upper part of the maturation tank 5, which is connected to the sedimentation tank 6; three mud discharge hoppers are provided at the bottom of the sedimentation tank 6 for discharging sludge; a drainage assembly is provided at the upper part of the sedimentation tank 6, which is connected to the neutralization reaction tank 7 and is used to discharge purified water into the neutralization reaction tank 7; a third water outlet is provided at the bottom of the neutralization reaction tank 7, which is connected to the buffer tank 8, and the bottom of the buffer tank 8 is connected to the outlet pipe 9. The magnesium removal reaction tank 2 is connected to the second pH detection component 201, the calcium removal reaction tank 3 is connected to the third pH detection component 301, the buffer tank 8 is connected to the fourth pH detection component 801, and the flocculation tank 4 is connected to the second conductivity detection component 401. The second pH detection component 201, the third pH detection component 301, the second conductivity detection component 401 and the fourth pH detection component 801 are independently electrically connected to the central control unit. The magnesium removal reaction tank 2 is provided with a first stirring component 202, the calcium removal device is provided with a second stirring component 302, the flocculation tank 4 is provided with a third stirring component 402, and the neutralization reaction tank 7 is provided with a fourth stirring component 701.

[0072] The dosing unit includes a first dosing device 10, a second dosing device 11, a third dosing device 12 and a fourth dosing device 13. The first dosing device 10 is connected to the magnesium removal reaction tank 2 to provide lime to the magnesium removal reaction tank 2. The second dosing device 11 is connected to the decalcification reaction tank 3 to provide sodium carbonate to the decalcification reaction tank 3, and the outlet end of the second dosing device 11 is also provided with a flow detection component 111 electrically connected to the central control unit. The third dosing device 12 is connected to the flocculation tank 4 to provide polyacrylamide to the flocculation tank 4. The fourth dosing device 13 is connected to the neutralization reaction tank 7 to provide hydrochloric acid to the neutralization reaction tank 7. The first dosing device 10, the second dosing device 11, the third dosing device 12 and the fourth dosing device 13 independently include a dosing pump and a drug source. The dosing pumps of the first dosing device 10 and the second dosing device 11 are both variable frequency dosing pumps, and the dosing pumps of the third dosing device 12 and the fourth dosing device 13 are conventional pumps.

[0073] The method for softening and removing hardness of wastewater using the high-salinity wastewater softening and hardness removal device system provided in this embodiment comprises the following steps:

[0074] (1) Wastewater is injected from the water inlet pipe 1 and sequentially passes through the magnesium removal reaction tank 2, the calcium removal reaction tank 3, the flocculation tank 4, the aging tank 5, the sedimentation tank 6, the neutralization reaction tank 7 and the buffer tank 8, and a dosing unit is used to add lime to the magnesium removal reaction tank 2, sodium carbonate to the calcium removal reaction tank 3, polyaluminium chloride to the flocculation tank 4, and hydrochloric acid to the neutralization reaction tank 7;

[0075] (2) obtaining a first pH value of the influent wastewater and a second pH value of the wastewater in the magnesium removal reaction tank 2, monitoring the influent water quality changes in real time through the first pH value, setting an acid-base threshold, analyzing and comparing the second pH value with the acid-base threshold, and adjusting the dosing frequency of the hardness removal agent according to the analysis results;

[0076] (3) The first conductivity detection component 102 is used to obtain the first conductivity of the wastewater inlet, and the second conductivity detection component 401 is used to obtain the second conductivity of the wastewater in the flocculation tank 4. The hardness of the effluent from the wastewater outlet pipe 9 is detected every 1 hour;

[0077] (4) Determine whether the water hardness exceeds 200 mg / L. If so, adjust and increase the dosing frequency of the softening agent. Otherwise, determine whether the difference between the first conductivity and the second conductivity is greater than 2000 us / cm;

[0078] When the difference is greater than 2000us / cm, the dosing frequency of the softening agent is adjusted to be reduced. When the difference is less than or equal to the purification threshold, the dosing frequency of the softening agent remains unchanged.

[0079] (5) obtaining a third pH value of the wastewater in the decalcification reaction tank 3, monitoring the water quality of the wastewater in the decalcification reaction tank 3 based on the change of the third pH value, and controlling the amount of dosing and the start and stop of dosing;

[0080] (6) Obtaining a fourth pH value of the wastewater in the buffer tank 8 and determining whether the fourth pH value is between 6 and 7; when the fourth pH value exceeds the range of 6 to 7, adjusting the amount of hydrochloric acid provided to the neutralization reaction tank 7.

[0081] Example 2

[0082] This embodiment provides a high-salt wastewater softening and de-hardening device system, which differs from Embodiment 1 in that the dosing unit also includes a fifth dosing device connected to the decalcification reaction tank, which is used to provide polyaluminum chloride to the softening reaction tank. The rest of the structure is the same as that of Embodiment 1.

[0083] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A high-salinity wastewater softening and hardness removal device system, characterized in that: The device system includes a reaction unit, a dosing unit and a central control unit; the reaction unit includes an inlet pipe, a precipitation reactor and an outlet pipe connected in sequence; a first detection module is arranged on the inlet pipe, the precipitation reactor includes a plurality of purification monomers, the purification monomers are provided with a second detection module, the outlet pipe is provided with a third detection module, the first detection module, the second detection module and the third detection module are used to detect the quality of wastewater; the dosing unit is used to provide reagents to the purification monomers; the central control unit is electrically connected to the first detection module, the second detection module, the third detection module and the dosing unit respectively.

2. The high-salinity wastewater softening and hardness removal device system according to claim 1 is characterized in that: The first detection module includes a first pH detection component and a first conductivity detection component arranged on the water inlet pipe, and is used to detect the pH value and conductivity of the wastewater inlet, respectively; The first pH detection component and the first conductivity detection component are independently and electrically connected to the central control unit, and are used to transmit the pH value and conductivity of the wastewater inlet to the central control unit.

3. The high-salinity wastewater softening and hardness removal device system according to claim 1 is characterized in that: Several of the purification units include a magnesium removal device, a calcium removal device and a flocculation device connected in sequence; The dosing unit includes a first dosing device, a second dosing device and a third dosing device, the first dosing device is connected to the magnesium removal device, the second dosing device is connected to the calcium removal device, and the third dosing device is connected to the flocculation device; the first dosing device, the second dosing device and the third dosing device independently include a dosing pump and a drug source; The dosing pumps of the first dosing device and the second dosing device are both variable frequency dosing pumps, and the variable frequency dosing pumps are electrically connected to the central control unit.

4. The high-salinity wastewater softening and hardness removal device system according to claim 3 is characterized in that: The second detection module includes a second pH detection component, a third pH detection component and a second conductivity detection component; the second pH detection component is connected to the magnesium removal device, the third pH detection component is connected to the calcium removal device, and the second conductivity detection component is connected to the flocculation device; the second pH detection component, the third pH detection component and the second conductivity detection component are independently electrically connected to the central control unit.

5. The high-salinity wastewater softening and hardness removal device system according to claim 3 is characterized in that: The outlet end of the second dosing device is also provided with a flow detection component, and the flow detection component is electrically connected to the central control unit.

6. The high-salinity wastewater softening and hardness removal device system according to claim 3 is characterized in that: The magnesium removal device is provided with a first stirring component; A second stirring assembly is provided in the decalcification device; A third stirring component is arranged in the flocculation device.

7. The high-salinity wastewater softening and hardness removal device system according to claim 3 is characterized in that: Several of the purification units further include a maturation device, a sedimentation device, a neutralization device and a buffer device which are connected in sequence. The water inlet end of the maturation device is connected to the flocculation device, and the water outlet end of the buffer device is connected to the water outlet pipe.

8. The high-salinity wastewater softening and hardness removal device system according to claim 7 is characterized in that: The dosing unit further includes a fourth dosing device, the fourth dosing device is connected to the neutralization device, the fourth dosing device includes a dosing pump and a medicine source, and the dosing pump is electrically connected to the central control unit.

9. The high-salinity wastewater softening and hardness removal device system according to claim 7 is characterized in that: The second detection module further includes a fourth pH detection component connected to the buffer device, and the fourth pH detection component is electrically connected to the central control unit; A fourth stirring component is arranged in the neutralization device.

10. The high-salinity wastewater softening and hardness removal device system according to claim 1 is characterized in that: The third detection module includes a hardness detection component arranged on the water outlet pipe, which is used to detect the outlet water hardness of the wastewater.

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