Integrated wastewater pretreatment equipment

Abstract

The invention relates to the technical field of wastewater treatment, and provides integrated wastewater pretreatment equipment which comprises a shell, a reaction area, a solid-liquid separation area, a water purification area and a solid sediment concentration area are arranged in the shell; an inlet of the solid-liquid separation zone is communicated with an outlet of the reaction zone; the water purification area is communicated with the solid-liquid separation area, and the water purification area is used for filtering settled liquid in the solid-liquid separation area and outputting the filtered liquid to a reverse osmosis process; and the solid sediment concentration area is communicated with the solid-liquid separation area. The integrated equipment integrates various functions in a pretreatment process, so that the process integration degree is high, the maintenance process is simplified, the occupied area is reduced, the process flow is shortened, and the stability of the effluent quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly relates to an integrated wastewater pretreatment device. Background Art

[0002] The traditional pretreatment process before wastewater enters a reverse osmosis device is usually connected through multiple process tanks. For example, the pretreatment of wastewater is achieved by connecting multiple reaction tanks and filtration tanks. This treatment process requires a large process site, has a complex process connection, a long process flow, a large floor area, an unstable sedimentation effect, and is difficult to maintain, resulting in a situation where a fault may occur in a certain process without being noticed, and the stability of the effluent water quality from the clarifier is poor.

[0003] Therefore, based on the above technical problems, an integrated wastewater pretreatment device is needed. This integrated device integrates various functions in the pretreatment process, resulting in a high degree of process integration, simplified maintenance process, reduced occupied area, shortened process flow, and improved stability of the effluent water quality. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated wastewater pretreatment device. This integrated device integrates various functions in the pretreatment process, resulting in a high degree of process integration, simplified maintenance process, reduced occupied area, shortened process flow, and improved stability of the effluent water quality.

[0005] The present invention provides an integrated wastewater pretreatment device, including a housing;

[0006] A reaction zone, a solid-liquid separation zone, a purified water zone, and a solid sediment concentration zone are arranged inside the housing;

[0007] An inlet and a chemical addition port communicating with the reaction zone are arranged on the housing;

[0008] The inlet of the solid-liquid separation zone is communicated with the outlet of the reaction zone, and the solid-liquid separation zone is used for sedimentation of solids in the wastewater;

[0009] The purified water zone is communicated with the solid-liquid separation zone, and the purified water zone is used for filtering the liquid sedimented in the solid-liquid separation zone;

[0010] The solid sediment concentration zone is communicated with the solid-liquid separation zone, and the solid sediment concentration zone is used for receiving the solid sediment settled in the solid-liquid separation zone and concentrating the solid sediment.

[0011] Optionally, the reaction zone is located above the solid-liquid separation zone, and the outlet of the reaction zone is higher than the inlet of the solid-liquid separation zone.

[0012] Optionally, the purified water area is located above the solid-liquid separation area, and the solid sediment concentration area is located below the solid-liquid separation area; and / or, the reaction area and the purified water area are arranged horizontally.

[0013] Optionally, the reaction area includes a first reaction area and a second reaction area;

[0014] The water inlet and the chemical addition port are at least in communication with the first reaction area, the outlet of the first reaction area is in communication with the inlet of the second reaction area, and the outlet of the second reaction area is in communication with the inlet of the solid-liquid separation area;

[0015] A baffle is provided in the second reaction area, and each baffle forms a zigzag channel for the wastewater to pass through and bend back and forth.

[0016] Optionally, a plurality of inclined settling members are provided in the solid-liquid separation area, the settling members have inclined settling surfaces, and the bottom of the settling surfaces extends to the inlet of the solid sediment concentration area.

[0017] Optionally, the bottom of the solid sediment concentration area is in a tapered structure that narrows downward, and a scraping assembly is provided in the solid sediment concentration area. The scraping assembly is used to push the solid sediment at the bottom of the solid sediment concentration area so that the solid sediment gathers at the lowest point of the bottom of the solid sediment concentration area.

[0018] Optionally, a delivery port is provided at the lowest point of the solid sediment concentration area. The delivery port is in communication with a first delivery pipe and a second delivery pipe. The first delivery pipe is in communication with the reaction area to deliver part of the solid sediment in the solid sediment concentration area to the reaction area, and the second delivery pipe is used to deliver another part of the solid sediment to the drying area.

[0019] Optionally, a microfiltration membrane module is provided in the purified water area. The inner cavity of the microfiltration membrane module is in communication with a drain pipe, and the drain pipe penetrates outside the housing.

[0020] Optionally, the inner cavity of the microfiltration membrane module is also in communication with a backwash pipe, and the backwash pipe is used to introduce backwash liquid and / or backwash gas into the inner cavity of the microfiltration membrane module.

[0021] Optionally, an air pipe is provided in the purified water area. The air outlet of the air pipe is located below the microfiltration membrane module and faces the microfiltration membrane module so that the gas introduced into the purified water area by the air pipe contacts the outer surface of the microfiltration membrane module. The air outlet of the air pipe is located above the solid-liquid separation area so that the gas introduced into the purified water area by the air pipe does not enter the solid-liquid separation area.

[0022] In summary, the integrated wastewater pretreatment equipment includes a housing; a reaction zone, a solid-liquid separation zone, a purified water zone, and a solid sediment concentration zone are arranged in the housing; an inlet and a chemical agent addition port communicating with the reaction zone are arranged on the housing; the inlet of the solid-liquid separation zone communicates with the outlet of the reaction zone, and the solid-liquid separation zone is used for settling solids in the wastewater; the purified water zone communicates with the solid-liquid separation zone, and the purified water zone is used for filtering the liquid settled in the solid-liquid separation zone; the solid sediment concentration zone communicates with the solid-liquid separation zone, and the solid sediment concentration zone is used for receiving the solid sediment settled in the solid-liquid separation zone and concentrating the solid sediment.

[0023] With such a configuration, the partition in the above integrated wastewater pretreatment equipment forms four functional zones: a reaction zone, a solid-liquid separation zone, a purified water zone, and a solid sediment concentration zone, enabling the equipment to have the functions of coagulation, sedimentation, filtration, and solid sediment concentration. This equipment can be used for removing hardness, silicon, heavy metal ions, turbidity, etc. from wastewater, and can effectively reduce the pollutant concentration in the wastewater. The above equipment integrates filtration technology with chemical softening for hardness removal, fluoride removal, and organic matter removal technologies, enabling the integrated equipment to integrate various functions in the pretreatment process, with a high degree of process integration, simplified maintenance process, reduced occupied area (the floor area can be reduced by more than 50%), greatly shortened process flow, and contributed to improving the stability of the effluent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the integrated wastewater pretreatment equipment in some embodiments of the present invention Figure 1 ;

[0025] Figure 2 is a schematic structural diagram of the integrated wastewater pretreatment equipment in some embodiments of the present invention Figure 2 。

[0026] Wherein, in the drawings:

[0027] 100 - housing;

[0028] 10 - reaction zone; 101 - first reaction zone; 102 - second reaction zone;

[0029] 11 - inlet; 12 - chemical agent addition port; 13 - baffle; 14 - stirring blade;

[0030] 20 - solid-liquid separation zone; 21 - settling member;

[0031] 30 - purified water zone; 31 - microfiltration membrane module; 32 - drain pipe; 33 - backwash pipe; 34 - air pipe; 35 - first water pump; 36 - compressed air equipment; 37 - second water pump; 38 - fan;

[0032] 40 - Solid sediment concentration area; 41 - Scraping component; 42 - First conveying pipe; 43 - Second conveying pipe; 44 - Concave area; 45 - First sludge pump; 46 - Second sludge pump; 47 - Sludge level gauge; 48 - Flowmeter;

[0033] 51 - External water supply equipment; 52 - First chemical dosing equipment; 53 - Second chemical dosing equipment;

[0034] 200 - Drying system;

[0035] 300 - Water tank. Detailed implementation manner

[0036] The following further describes in detail the integrated wastewater pretreatment equipment proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0037] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is usually used in the sense of including "and / or", the term "several" is usually used in the sense of including "at least one", the term "at least two" or "multiple" is usually used in the sense of including "two or more", in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features. In addition, as used in the present invention, "installed", "connected", "coupled", an element "disposed" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the two elements can be directly or indirectly connected, coupled, cooperated or transmitted through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, an element can be inside, outside, above, below or on one side of another element in any orientation, unless the content clearly indicates otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the figures, with the upward or upward direction facing the top of the corresponding figure and the downward or downward direction facing the bottom of the corresponding figure.

[0038] Please refer to Figure 1 and Figure 2As shown, this embodiment provides an integrated wastewater pretreatment device. The wastewater to be treated by this device can be coking wastewater after biochemical treatment or concentrated brine after membrane concentration, which contains high levels of pollutants such as COD, hardness, fluoride, and silica.

[0039] The integrated wastewater pretreatment device includes a housing 100;

[0040] A reaction zone 10, a solid-liquid separation zone 20, a purified water zone 30, and a solid sediment concentration zone 40 are provided inside the housing 100.

[0041] An inlet 11 and a chemical agent addition port 12 that communicate with the reaction zone 10 are provided on the housing 100.

[0042] As Figure 2 shown, the inlet 11 is connected to an external water supply device 51 for supplying wastewater. There are two chemical agent addition ports 12. One of the chemical agent addition ports 12 is connected to an external first chemical agent supply device 52 for adding chemical agents; the other chemical agent addition port 12 is connected to an external second chemical agent supply device 53 for adding chemical agents. The two chemical agent addition ports 12 add chemical agents to different positions in the reaction zone 10. The chemical agents are generally flocculants or coagulants. The added chemical agents react with the wastewater to produce a coagulation reaction, causing suspended particles to aggregate into larger flocs, facilitating solid sedimentation to achieve solid-liquid separation. In other alternative embodiments, the chemical agent addition port 12 can add chemical agents for functions such as softening, defluorination, and desilication.

[0043] The inlet of the solid-liquid separation zone 20 communicates with the outlet of the reaction zone 10. The liquid after the coagulation reaction enters the interior of the solid-liquid separation zone 20 through the outlet of the reaction zone 10 and the inlet of the solid-liquid separation zone 20. The solid-liquid separation zone 20 is used to cause the solids in the wastewater to settle. The large particle flocs formed in the reaction zone 10 are guided to the solid-liquid separation zone 20 and settle down by gravity.

[0044] The purified water zone 30 communicates with the solid-liquid separation zone 20. The purified water zone 30 is used to filter the liquid settled in the solid-liquid separation zone 20 and output the filtered liquid to the reverse osmosis process. Appropriate filter membranes can be selected in the purified water zone 30 based on requirements. For example, it can achieve functions such as hardness removal, silica removal, heavy metal ion removal, and turbidity removal.

[0045] The solid sediment concentration zone 40 communicates with the solid-liquid separation zone 20. The solid sediment concentration zone 40 is used to receive the solid sediments settled in the solid-liquid separation zone 20 and concentrate the solid sediments.

[0046] The concentration function of the solid sediment concentration area 40 can be used to reduce the water content of the solid sediment, thereby increasing the solid content in the sediment under the same volume. The solid sediment concentration area 40 can be concentrated by gravity or external force to remove the water in the solid sediment and make the solid sediment more compact.

[0047] The above-mentioned partition in the integrated wastewater pretreatment equipment forms four functional areas: the reaction area 10, the solid-liquid separation area 20, the purified water area 30, and the solid sediment concentration area 40, enabling the equipment to have the functions of coagulation, sedimentation, filtration, and solid sediment concentration. The equipment can be used for removing hardness, silicon, heavy metal ions, turbidity, etc. from wastewater, and can effectively reduce the pollutant concentration in the wastewater. The above equipment integrates filtration technology with technologies for chemical softening to remove hardness, fluoride, and organic matter, enabling the integrated equipment to integrate various functions in the pretreatment process, with a high degree of process integration, simplified maintenance process, reduced occupied area (the floor area can be reduced by more than 50%), greatly shortened process flow, and help improve the stability of the effluent quality.

[0048] Combined Figure 1 As shown, in this embodiment, the reaction area 10 is located above the solid-liquid separation area 20, and the outlet of the reaction area 10 is higher than the inlet of the solid-liquid separation area 20. Specifically, the outlet of the reaction area 10 is located at the bottom of the reaction area 10, and the inlet of the solid-liquid separation area 20 is located at the top of the solid-liquid separation area 20. This layout enables the wastewater after reaction in the reaction area 10 to flow into the solid-liquid separation area 20 by gravity, and this process does not require dedicated power equipment (such as a water pump), which helps reduce energy consumption.

[0049] Furthermore, the purified water area 30 is located above the solid-liquid separation area 20, and the solid sediment concentration area 40 is located below the solid-liquid separation area 20; the reaction area 10 and the purified water area 30 are arranged horizontally.

[0050] The top of the solid-liquid separation area 20 has an open structure, and the bottom of the purified water area 30 has an open structure. The top of the solid-liquid separation area 20 and the bottom of the purified water area 30 are naturally connected, and there is no obvious boundary at the connection. This setting enables the solid sediment in the solid-liquid separation area 20 to settle downward. As the liquid injected into the solid-liquid separation area 20 increases, the liquid level gradually rises, and the supernatant after sedimentation naturally enters the purified water area 30 for filtration. This setting enables the supernatant in the purified water area 30 to be naturally separated from the solid sediment, preventing the solid sediment from entering the purified water area 30. At the same time, this setting also enables the liquid from the solid-liquid separation area 20 to the purified water area 30 not to require dedicated power equipment (such as a water pump) for transportation, which helps reduce energy consumption.

[0051] In this embodiment, the bottom of the solid-liquid separation zone 20 has an open structure, and the top of the solid sediment concentration zone 40 has an open structure. The bottom of the solid-liquid separation zone 20 and the top of the solid sediment concentration zone 40 are naturally connected, and there is no obvious boundary at the connection. This setting enables the solid sediment in the solid-liquid separation zone 20 to naturally settle downward. As the sediment increases, it naturally slides down to the solid sediment concentration zone 40 due to its own weight. This process also does not require a dedicated power device (such as a sludge pump) to transport the solid sediment, which helps to reduce energy consumption.

[0052] The settings of the above-mentioned regions are relatively reasonable, which helps to improve the space utilization rate of the housing and enables the wastewater to flow in each region by gravity. The processes of each region are naturally connected, which helps to improve the efficiency of wastewater pretreatment and also effectively reduces energy consumption.

[0053] Please refer to Figure 1 and Figure 2 As shown, the reaction zone 10 includes a first reaction zone 101 and a second reaction zone 102;

[0054] The water inlet 11 is connected to the first reaction zone 101. A stirring blade 14 is arranged in the first reaction zone 101. The stirring blade 14 is externally connected to a first motor, and the stirring blade 14 is driven to rotate by the first motor. Strong mechanical stirring is adopted in the first reaction zone 101 to quickly, fully, and mix the wastewater with the reagent.

[0055] The two reagent addition ports 12 are respectively connected to the first reaction zone 101 and the second reaction zone 102 for adding reagents into the first reaction zone 101 and the second reaction zone 102 respectively.

[0056] The outlet of the first reaction zone 101 is connected to the inlet of the second reaction zone 102. The bottom of the first reaction zone 101 and the bottom of the second reaction zone 102 are at the same height. The outlet of the first reaction zone 101 is located at the bottom of the first reaction zone 101, and the inlet of the second reaction zone 102 is located at the bottom of the second reaction zone 102.

[0057] The outlet of the second reaction zone 102 is connected to the inlet of the solid-liquid separation zone 20; the outlet of the second reaction zone 102 is located at the top of the second reaction zone 102. The liquid in the first reaction zone 101 flows into the second reaction zone 102, and as the liquid level in the second reaction zone 102 rises, it flows out from the outlet of the second reaction zone 102.

[0058] A baffle 13 is arranged in the second reaction zone 102. As Figure 1 shown, the baffle 13 is of a plate structure and extends vertically. Each baffle 13 forms a baffle channel for the wastewater to pass through and bend vertically and reciprocally.

[0059] In the second reaction zone 102, a baffle 13 is used to guide the hydraulic mixing of water. The setting of the baffle 13 helps to reduce the velocity gradient of the water flow, so that the suspended substances in the water can be more evenly distributed, thereby increasing the chance of their aggregation into clusters and improving the flocculation efficiency.

[0060] The above setting method of the reaction zone 10 combines mechanical mixing and plug flow mixing. On the one hand, it improves the mixing and flocculation efficiency, and on the other hand, it also helps to reduce the energy consumption required for the mixing and flocculation of wastewater.

[0061] In the above embodiment, the baffle 13 is vertically arranged, so that the baffle channel bends vertically back and forth. In other alternative embodiments, the baffle 13 can also be horizontally arranged so that the baffle channel bends horizontally back and forth.

[0062] Please continue to refer to Figure 1 As shown, a plurality of inclined settling members 21 are arranged in the solid-liquid separation zone 20. The settling members 21 have inclined settling surfaces. The bottom of the settling surface extends to the inlet of the solid sediment concentration zone 40. When there is enough solid sediment settled on the settling surface, the solid sediment naturally slides down into the solid sediment concentration zone 40 by its own weight. The inclination angle of the settling surface should be relatively large to ensure the natural sliding of the solid sediment. For example, the inclination angle is set to 50° - 60°.

[0063] In this embodiment, the settling member 21 is of plate structure, and the settling members 21 are arranged in parallel. The upper surface of the settling member 21 serves as the settling surface. By arranging a plurality of settling members 21, it helps to increase the contact area with the wastewater and improve the settling capacity. Moreover, the settling member 21 is arranged in an inclined structure. On the one hand, it increases the horizontal projected area to improve the settling capacity. On the other hand, as the solid sediment accumulates on the settling surface, the self-weight of the solid sediment is used to make it automatically slide into the solid sediment concentration zone 40, which helps to improve the sludge discharge efficiency of the solid sediment.

[0064] Combined with Figure 1 and Figure 2 As shown, the wastewater containing flocs in the second reaction zone 102 enters the solid-liquid separation zone 20 and is quickly settled through the settling members 21 to achieve solid-liquid separation. The settling members 21 are densely arranged, and the settling members 21 divide the wastewater flow into multiple thin layers. Applying the principle of shallow sedimentation, the suspended particles only need to settle a very short distance to reach the settling surface, which helps to improve the settling efficiency. The supernatant of the settled water body rises to the purified water zone 30, and at the same time, the solid sediment settled on the settling surface slides along the settling surface to the solid sediment concentration zone 40, making the purification and sedimentation processes synchronous and orderly, and improving the wastewater treatment effect.

[0065] Furthermore, the bottom inside the solid sediment concentration area 40 is in a downwardly narrowing conical structure. A scraping component 41 is arranged inside the solid sediment concentration area 40. The scraping component 41 is used to push the solid sediment at the bottom of the solid sediment concentration area 40 so that the solid sediment gathers towards the lowest point at the bottom of the solid sediment concentration area 40.

[0066] Please refer to Figure 1 and Figure 2 As shown, the bottom of the solid sediment concentration area 40 is in a conical surface, which converges towards the center, and there is a sunken area 44 at the center. The inner cavity of the sunken area 44 is in a downwardly narrowing frustum conical structure. The scraping component 41 pushes the solid sediment on the bottom conical surface towards the center. The solid sediment is concentrated by self-weight extrusion in the sunken area 44, so that the solid sediment has less water content. The solid content of the solid sediment discharged outside the system can reach more than 5% - 8%, and it can directly enter the plate and frame filter press without secondary concentration.

[0067] Please continue to refer to Figure 1 and Figure 2 As shown, the scraping component 41 has blades adapted to the conical surface at the bottom of the sediment concentration area 40, and it is driven to rotate by a second motor arranged at the top of the housing 100. When the scraping component 41 rotates, it rotates while fitting to the conical bottom of the sediment concentration area 40, and can push the solid sediment settled at the bottom into the sunken area 44.

[0068] When the solid sediment on the sedimentation surface of the sedimentation part 21 slides obliquely to the bottom of the solid sediment concentration area 40, the solid sediment settled at the bottom is gradually compacted under its own weight, squeezing out the interstitial water. The scraping component 41 slowly rotates to push the solid sediment towards the sunken area 44 at the center of the bottom of the solid sediment concentration area 40, further squeezing out the interstitial water to achieve concentration.

[0069] The solid sediment concentration area 40 can be used to reduce the water content of the solid sediment, thereby reducing the volume of the solid sediment. Through gravity concentration, the water in the solid sediment is removed, making the solid sediment more compact.

[0070] Furthermore, a delivery port is arranged at the bottom of the lowest sunken area 44 of the solid sediment concentration area 40. The delivery port is communicated with a first delivery pipe 42 and a second delivery pipe 43. The first delivery pipe 42 is communicated with the reaction area 10 to deliver part of the solid sediment in the solid sediment concentration area 40 to the reaction area 10, and the second delivery pipe 43 is used to deliver another part of the solid sediment to the drying area.

[0071] As Figure 2As shown, a first sludge pump 45 is provided on the first delivery pipe 42. When the first sludge pump 45 is turned on, the solid sediment in the solid sediment concentration area 40 can be conveyed into the first reaction area 101. At this time, the chemicals, wastewater and solid sediment in the first reaction area 101 are fully mixed to form a coagulation reaction.

[0072] In this equipment, by means of returning the solid sediment, the unreacted chemicals can be fully utilized and the flocculation effect of the returned solid sediment itself can be utilized to reduce the chemical consumption. Compared with the traditional technology, the chemical consumption can be reduced by more than 30%.

[0073] Please continue to refer to Figure 2 As shown, a second sludge pump 46 is provided on the second delivery pipe 43. When the second sludge pump 46 is turned on, the solid sediment in the solid sediment concentration area 40 can be conveyed to the drying area for drying without further concentration.

[0074] In this embodiment, a sludge level gauge 47 is provided in the solid sediment concentration area 40 to detect the content of the solid sediment in the solid sediment concentration area 40, so as to distribute the amount of the solid sediment conveyed by the first delivery pipe 42 and the second delivery pipe 43. When the return flow of the solid sediment conveyed by the first delivery pipe 42 reaches the requirement, the first sludge pump 45 stops running, and the second sludge pump 46 starts to convey the remaining part of the solid sediment to the solid sediment drying system 200 for drying.

[0075] In this embodiment, a flow meter 48 is provided on the first delivery pipe 42 to accurately detect the return flow of the solid sediment. Through the configuration of the sludge level gauge 47 and the flow meter 48, the automation degree of the equipment is high, and the equipment can operate fully automatically, only requiring daily inspection and monitoring by the upper computer.

[0076] In this embodiment, the first delivery pipe 42 and the second delivery pipe 43 are connected, and a valve is provided between the first delivery pipe 42 and the second delivery pipe 43 to control the on-off.

[0077] Please continue to refer to Figure 1 and Figure 2 As shown, a microfiltration membrane module 31 is provided in the water purification area 30. There are multiple microfiltration membrane modules 31, and the inner cavities of the microfiltration membrane modules 31 are communicated with a drain pipe 32, and the drain pipe 32 penetrates outside the housing 100.

[0078] A plurality of joints are connected to the drain pipe 32, and each joint is communicated with the inner cavity of each microfiltration membrane module 31.

[0079] The microfiltration membrane module 31 has excellent characteristics such as corrosion resistance, oxidation resistance, solvent resistance, wear resistance and non-sticking, and hydrophilicity, and has good adaptability to various complex environments.

[0080] The microfiltration membrane module 31 adopts a microfiltration membrane module with good hydrophilicity, large water permeability, good chemical stability, good anti-pollution performance, high corrosion resistance and high mechanical strength. For example, a free-end PTFE polytetrafluoroethylene heterogeneous membrane element is adopted. The type of the microfiltration membrane module 31 is an external pressure bag-type membrane. The membrane material substrate is made of polytetrafluoroethylene as the substrate and added with hydrophobic substances. The membrane pore size is less than 0.1μm, the produced water turbidity is less than 0.3NTU, and the interception rate of chemical pollutants is as high as 98% (in the liquid zero-discharge project, the hardness of the produced water can be lower than 10mg / L, silicon can be lower than 10mg / L, fluoride is lower than 10mg / L, and SDI is less than 3). The produced water filtered by the microfiltration membrane module 31 can directly enter the RO system.

[0081] The supernatant liquid in the solid-liquid separation area 20 is filtered by the microfiltration membrane module 31 from bottom to top. The filtered liquid enters the inner cavity of the microfiltration membrane module 31, and impurities adhere to the outer wall of the microfiltration membrane module 31 and are removed. As Figure 2 shown, the drain pipe 32 is externally connected to the first water pump 35, and the liquid filtered by the microfiltration membrane module 31 is sent to the first water tank 300 through the first water pump 35.

[0082] Furthermore, the inner cavity of the microfiltration membrane module 31 is communicated with the backwash pipe 33, and the backwash pipe 33 is used to introduce backwash liquid and / or backwash gas into the inner cavity of the microfiltration membrane module 31.

[0083] Please continue to refer to Figure 1 and Figure 2 shown, the backwash pipe 33 penetrates outside the housing 100 and is respectively connected to the air outlet of the compressed air device 36 and the liquid outlet of the second water pump 37.

[0084] The liquid inlet of the second water pump 37 is communicated with the first water tank 300, so that the backwash of the microfiltration membrane module 31 can be realized by using the liquid stored in the first water tank 300 after being filtered by the microfiltration membrane module 31.

[0085] Air backwash of the microfiltration membrane module 31 can be realized by introducing air into the inner cavity of the microfiltration membrane module 31 through the compressed air device 36 and the backwash pipe 33, or liquid backwash of the microfiltration membrane module 31 can be realized by introducing clean liquid into the inner cavity of the microfiltration membrane module 31 through the second water pump 37 and the backwash pipe 33, or air-liquid backwash of the microfiltration membrane module 31 can be realized by introducing air and clean liquid into the inner cavity of the microfiltration membrane module 31 through the compressed air device 36 and the second water pump 37 at the same time, so as to restore the water production flux. This setting method makes the backwash more flexible to improve the backwash effect.

[0086] Further, an air pipe 34 is disposed in the water purification area 30. The air inlet of the air pipe 34 penetrates outside the housing 100 and is communicated with the air outlet of the fan 38. The air outlet of the air pipe 34 is located below the microfiltration membrane module 31, and this air outlet faces upward toward the microfiltration membrane module 31. A plurality of air outlets are provided on the air pipe 34, and each air outlet is respectively arranged corresponding to each microfiltration membrane module 31, so that the gas introduced into the water purification area 30 through the air pipe 34 contacts the outer surface of the microfiltration membrane module 31 during the upward movement. During the filtration operation of the microfiltration membrane module 31, gas can be introduced through the air pipe 34, and air is used for air scrubbing and vibrating the outer surface of the microfiltration membrane module 31 to prevent the escaped flocs from adhering to the surface of the microfiltration membrane module 31 and help maintain the filtration performance of the membrane. Air jitter is realized through the air pipe 34 to ensure the cleanliness of the surface of the microfiltration membrane module 31, so as to reduce the backwashing frequency and energy consumption.

[0087] The air outlet of the air pipe 34 is located above the solid-liquid separation area 20, so that the gas introduced into the water purification area 30 through the air pipe 34 floats upward and will not enter the solid-liquid separation area 20, preventing air from interfering with the solid sediment and ensuring the stability of the solid sedimentation environment.

[0088] In the present invention, solid-liquid separation is achieved through two-stage reactions in the first reaction zone 101 and the second reaction zone 102 and the solid-liquid separation area 20 provided with the inclined sedimentation member 21. Then, pollutants are removed by filtration through the microfiltration membrane module 31. After the solid sediment is compacted in the solid sediment concentration area 40, it is transported to the drying system 200. At the same time, part of the solid sediment flows back to the first reaction zone 101, realizing the effective utilization of the solid sediment, saving the chemical dosage and energy consumption compared with the traditional pretreatment process.

[0089] Based on the traditional process, this equipment is integrated and upgraded, greatly improving the effects of softening and removing hardness, fluoride and organic matter, and the produced water quality is excellent.

[0090] The above equipment has the advantages of short process flow, small floor area, small amount of solid sediment, low chemical consumption, low energy consumption, strong adaptability to water sources, high degree of automation and convenient operation and maintenance. This equipment is especially suitable for treating complex water sources such as high hardness, high alkalinity, high silicon, high organic matter and high suspended solids. The produced water quality is excellent and the produced water can directly enter the RO system. The equipment has a small amount of operation and maintenance work, and the membrane parts are simple to repair and replace. The equipment has low energy consumption, and its comprehensive energy consumption can be reduced by more than 30%.

[0091] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0092] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure fall within the scope of protection of the claims.

Claims

1. An integrated wastewater pretreatment device, characterized in that, Comprising a housing; A reaction zone, a solid-liquid separation zone, a purified water zone and a solid sediment concentration zone are arranged inside the housing; An inlet and a chemical addition port communicating with the reaction zone are arranged on the housing; The inlet of the solid-liquid separation zone communicates with the outlet of the reaction zone, and the solid-liquid separation zone is used for settling the solids in the wastewater; The purified water zone communicates with the solid-liquid separation zone, and the purified water zone is used for filtering the liquid settled in the solid-liquid separation zone; The solid sediment concentration zone communicates with the solid-liquid separation zone, and the solid sediment concentration zone is used for receiving the solid sediment settled in the solid-liquid separation zone and concentrating the solid sediment.

2. The integrated wastewater pretreatment equipment according to claim 1, wherein The reaction zone is located above the solid-liquid separation zone, and the outlet of the reaction zone is higher than the inlet of the solid-liquid separation zone.

3. The integrated wastewater pretreatment equipment according to claim 1 or 2, characterized in that, The purified water zone is located above the solid-liquid separation zone, and the solid sediment concentration zone is located below the solid-liquid separation zone; and / or, the reaction zone and the purified water zone are arranged horizontally.

4. The integrated wastewater pretreatment equipment according to claim 1, characterized in that, The reaction zone includes a first reaction zone and a second reaction zone; The inlet and the chemical addition port are at least in communication with the first reaction zone, the outlet of the first reaction zone communicates with the inlet of the second reaction zone, and the outlet of the second reaction zone communicates with the inlet of the solid-liquid separation zone; Baffling members are arranged in the second reaction zone, and each baffling member constitutes a baffling channel for the wastewater to pass through and bend back and forth.

5. The integrated wastewater pretreatment equipment according to claim 1, characterized in that, A plurality of inclined settling members are arranged in the solid-liquid separation zone, the settling members have inclined settling surfaces, and the bottom of the settling surfaces extends to the inlet of the solid sediment concentration zone.

6. The integrated wastewater pretreatment equipment according to claim 1, wherein, The bottom inside the solid sediment concentration zone is in a conical structure that narrows downward, and a scraping assembly is arranged inside the solid sediment concentration zone. The scraping assembly is used to push the solid sediment at the bottom of the solid sediment concentration zone so that the solid sediment gathers at the lowest point of the bottom of the solid sediment concentration zone.

7. The integrated wastewater pretreatment equipment according to claim 6, wherein A delivery port is arranged at the lowest point inside the solid sediment concentration zone. The delivery port communicates with a first delivery pipe and a second delivery pipe. The first delivery pipe communicates with the reaction zone to deliver part of the solid sediment in the solid sediment concentration zone to the reaction zone, and the second delivery pipe is used to deliver another part of the solid sediment to the drying zone.

8. The integrated wastewater pretreatment equipment according to claim 1, characterized in that, A microfiltration membrane module is arranged inside the purified water zone. The inner cavity of the microfiltration membrane module communicates with a drain pipe, and the drain pipe penetrates outside the housing.

9. The integrated wastewater pretreatment equipment according to claim 8, characterized in that, The inner cavity of the microfiltration membrane module also communicates with a backwash pipe, and the backwash pipe is used to introduce backwash liquid and / or backwash gas into the inner cavity of the microfiltration membrane module.

10. The integrated wastewater pretreatment equipment according to claim 8, characterized in that, An air pipe is arranged inside the purified water zone. The air outlet of the air pipe is located below the microfiltration membrane module and faces the microfiltration membrane module, so that the gas introduced into the purified water zone by the air pipe contacts the outer surface of the microfiltration membrane module. The air outlet of the air pipe is located above the solid-liquid separation zone, so that the gas introduced into the purified water zone by the air pipe does not enter the solid-liquid separation zone.

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