Wastewater solid-liquid separation structure and separation method thereof

Abstract

The invention relates to the technical field of sewage treatment, in particular to a wastewater solid-liquid separation structure and a separation method thereof. The processing device comprises a sewage tank and a liquid supply device, the interior of the sewage tank is divided into a liquid supply bin, a heating bin, a separation bin and a standing bin by an inner partition plate and an outer partition plate which are arranged in the sewage tank, and a liquid collection mechanism is arranged at the top of the heating bin and comprises a gas transmission part and a temperature sensing part. Cool air conveyed in a cooling capacity box is used for achieving separation of solidified grease and sewage, a boundary plate is promoted to guide grease discharged by a heating bin into a discharging channel, the moving path of the grease is changed, meanwhile, the cold air provides cooling capacity for hot air in a liquid storage box, and a memory spring is forced by condensed liquid to push a push plate to move; and the push plate pushes the solidified grease to the far end to isolate the solidified grease and receive the grease from the discharging channel, so that the solidified grease is prevented from hindering newly injected grease, and the grease treatment efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater solid-liquid separation structure and separation method thereof. Background Technology

[0002] In the oily wastewater of kitchen waste, the composition and existence form of oil are complex. It generally exists in the form of suspended oil, dispersed oil, emulsified oil, dissolved oil and oily solid waste. Among them, the most difficult to treat is the high concentration of emulsified oil.

[0003] Currently, Chinese Patent Publication No. CN115536199A discloses a kitchen wastewater oil filtration and treatment device and method, including an oil filter tank body, chain wheels on both sides of the oil filter tank body, and a power component on the chain wheels. The chain wheels are equipped with scrapers. The device and method also include a treatment component disposed inside the oil filter tank body; an addition component disposed inside the oil filter tank body; and a control component disposed inside the oil filter tank body for controlling the treatment component through the power of the scraper's movement. This kitchen wastewater oil filtration and treatment device and method utilizes the treatment component to prevent solidified grease from obstructing the underwater grease.

[0004] As the upper layer of grease in the sewage is scraped into the grease storage area, the scraper will scrape both the grease and sewage into the grease storage area at the same time. This causes the grease and sewage to mix together and become inseparable. When the grease storage area is exposed to cold weather, the grease is prone to solidify. This solidified grease will block the newly injected grease and sewage, which is not conducive to the stratification of oil and sewage, and thus affects the separation of oil and sewage. Summary of the Invention

[0005] This invention provides a wastewater solid-liquid separation structure that utilizes the condensed liquid to force a memory spring to move a pusher plate. The pusher plate pushes the solidified grease to a distal end, isolating the solidified grease, and receives grease from the feeding channel, preventing the solidified grease from obstructing newly injected grease, thereby solving the problems mentioned in the background art, namely: To achieve the above objectives, the wastewater solid-liquid separation structure includes a wastewater tank and a liquid supply device. The wastewater tank is divided into a liquid supply chamber, a heating chamber, a separation chamber, and a settling chamber by an inner and outer partition. A liquid collection mechanism is installed on top of the heating chamber, comprising a gas conveying section and a temperature sensing section. The gas conveying section is connected to a liquid storage box located within the separation chamber. The gas conveying section is covered by the inner partition and is used to guide the evaporated gas in the heating chamber to the liquid storage box. When the liquid level in the separation chamber reaches a preset discharge amount, a cooling supply mechanism located outside the liquid storage box is used. This cooling supply mechanism guides the grease discharged from the heating chamber into the separation chamber and cools the hot gas transported in the liquid storage box. The cooling effect of the condensed water droplets drives the temperature sensing section located in the liquid storage box to move. The temperature sensing section then pushes the solidified grease in the separation chamber further away to receive the grease discharged from the heating chamber into the separation chamber.

[0006] When cold air is introduced into the cold volume box, a discharge channel for grease to be discharged into the separation chamber is formed between the dividing plate and the liquid storage box. The dividing plate corresponding to the cold volume box has an exhaust box. The exhaust box is movably set at the end of the dividing plate. The exhaust box is connected to the opening on the discharge channel, and the dividing plate and the end of the cold volume box are elastically connected by a compression spring. The temperature sensing unit includes a push plate disposed below and abutting the dividing plate, and a memory spring located inside the liquid storage box. The memory spring is situated within a groove formed by an inner partition plate, the groove being close to the bottom of the liquid storage box. The lower end of the push plate extends into the grease and is used to push the grease layer away from the liquid storage box. A slide rod is fixedly disposed between the push plate and the memory spring, the slide rod penetrating the side wall of the liquid storage box. At this time, based on... Figure 5 Based on and combined Figure 7 and Figure 8 As shown, the connection between the gas duct and the liquid storage box is blocked by the condensed liquid, so the hot gas is no longer delivered to the cold storage box. The liquid level overflows the groove, causing the memory spring to be in a soft phase. The memory spring then pushes the slide bar to move, and the pusher plate pushes the unmelted solidified grease to one side, so that the pusher plate is away from the liquid storage box and connects with the upper discharge channel. The grease that passes through the discharge plate slides into the separation chamber, avoiding the unmelted solidified grease from forming a barrier to the newly injected grease.

[0007] The second objective of the invention is to provide a separation method for a solid-liquid separation structure for wastewater, comprising the following steps: S1. First, inject domestic sewage into the settling chamber for settling. After a period of time, the liquid supply device will pump the sewage in the settling chamber into the liquid supply chamber. The sewage will then be discharged into the heating chamber through the liquid supply chamber. At the same time, the heater installed in the heating chamber will heat the sewage. S2. The grease in the heating chamber floats upward and is discharged into the separation chamber. The cold energy box conducts cold energy to the grease, causing the grease to change from a liquid state to a solid state at a low temperature and solidify, so as to form a solid grease layer that floats on the sewage. S3, and when the oil pollution in the separation chamber reaches the preset discharge amount, the solidified grease is intercepted by the cold energy box, while the residual sewage in the separation chamber flows back to the liquid supply chamber.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: The cold air supplied in the cold air chamber separates solidified grease from wastewater and causes the dividing plate to guide the grease discharged from the heating chamber into the feeding channel, changing the movement path of the grease. At the same time, the cold air provides cooling for the hot air in the liquid storage box. The condensed liquid forces the memory spring to push the push plate to move. The push plate pushes the solidified grease to the far end to form an isolation of the solidified grease and receives the grease from the feeding channel, thereby avoiding the solidified grease from obstructing the newly injected grease and improving the grease processing efficiency. Attached Figure Description

[0009] Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the internal structure of the sewage tank of the present invention; Figure 3 This is a perspective view of the gas collection hood and gas collection pipe structure of the present invention; Figure 4 This is a schematic diagram illustrating the principle of wastewater conveying and suction using a pressure plate in this invention. Figure 5 This is a schematic diagram illustrating the principle of grease solidification in this invention; Figure 6 This is a schematic diagram showing the connection between the cold storage box and the dividing plate of the present invention; Figure 7 This is a schematic diagram illustrating the principle of hot gas delivery from the liquid storage box to the cold volume box in this invention. Figure 8 This is a schematic diagram of the oil flow according to the present invention.

[0010] The meanings of the labels in the diagram are as follows: 100. Wastewater tank; 101. Liquid supply device; 102. Inner partition; 102a. Feed plate; 103. Outer partition; 103a. Liquid supply chamber; 104. Heating chamber; 105. Separation chamber; 106. Hydraulic rod; 107. Through hole; 108. First check valve; 109. Conduit; 110. Liquid collection mechanism; 111. Gas collection hood; 111a. Discharge port; 112. Gas collection pipe; 113. Liquid storage box; 113a. Discharge channel; 113b. Discharge pipe; 114. Push plate; 115. Memory spring; 120. Cooling supply mechanism; 121. Cooling box; 121a. Infusion tube; 122. Dividing plate; 123. Compression spring; 124. Exhaust box; 125. Blower; 126. Air guide pipe; 127. Exhaust pipe; 128. Second check valve. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] The scraper often scrapes grease and wastewater simultaneously into the grease storage area, causing them to mix together and become difficult to separate. In cold weather, the grease in the storage area easily solidifies, obstructing newly injected grease and wastewater and hindering stratification, thus affecting separation. This invention provides a wastewater solid-liquid separation structure. (See attached image.) Figures 1-3 As shown, the system includes a wastewater tank 100 and a liquid supply device 101. An inner partition 102 and an outer partition 103 within the wastewater tank 100 divide it into a liquid supply chamber 103a, a heating chamber 104, a separation chamber 105, and a settling chamber. For details, please refer to [link to relevant documentation]. Figure 2 As shown, firstly, it needs to be clarified that during the injection process, domestic sewage is first injected into the settling chamber for settling. After a period of time, the supply device 101 pumps the sewage from the settling chamber into the supply chamber 103a. The sediment is discharged through the drain pipe, and the sewage is discharged into the heating chamber 104 through the supply chamber 103a. At the same time, the heater (not shown in the figure) installed in the heating chamber 104 heats the sewage, causing the grease in the heating chamber 104 to float upward and be discharged into the separation chamber 105. The grease is separated from the sewage in the separation chamber 105 and discharged from the separation chamber 105. The sewage remaining in the separation chamber 105 flows back into the supply chamber 103a. The above process is the entire flow path of the sewage. The following is a step-by-step explanation: A liquid collection mechanism 110 is provided on the top of the heating chamber 104. The liquid collection mechanism 110 includes a gas conveying section and a temperature sensing section. The gas venting section is connected to a liquid storage box 113 located in the separation chamber 105. The gas conveying section is covered by the inner partition 102 and is used to guide the evaporated gas in the heating chamber 104 to the liquid storage box 113. When the liquid level in the separation chamber 105 reaches the preset discharge amount, in conjunction with the use of the cold energy supply mechanism 120 located outside the liquid storage box 113, the cold energy supply mechanism 120 can guide the grease discharged from the heating chamber 104 to the separation chamber 105 into the separation chamber 105 and cool the hot gas transported in the liquid storage box 113. The cold energy of the condensed water droplets drives the temperature sensing section located in the liquid storage box 113 to move. The temperature sensing section is used to push the solidified grease in the separation chamber 105 to the far end to receive the grease discharged from the heating chamber 104 to the separation chamber 105. First, the reason why the sewage in the supply chamber 103a can be discharged into the heating chamber 104 is that: at the bottom of the inner partition 102 near the outer partition 103, there is a through hole 107 connecting the supply chamber 103a and the heating chamber 104; a hydraulic rod 106 is provided at the top of the outer partition 103; and a pressure plate is provided at the bottom of the hydraulic rod 106 to press the sewage in the supply chamber 103a into the heating chamber 104. On the other hand, a conduit 109 connecting the separation chamber 105 and the supply chamber 103a is provided above the through hole 107. Both the conduit 109 and the through hole 107 are provided with a first one-way valve 108. The first one-way valve 108 located in the through hole 107 is intended to supply the sewage in the supply chamber 103a into the heating chamber 104, while the first one-way valve 108 located in the conduit 109 is intended to return the sewage in the separation chamber 105 to the supply chamber 103a. Working principle: Before the sewage in the supply chamber 103a is pumped into the heating chamber 104, the pressure plate moves up to the top. Then, the supply device 101 pumps the sewage from the settling chamber into the supply chamber 103a for use. As the sewage is injected into the supply chamber 103a, the water levels in the supply chamber 103a and the heating chamber 104 rise synchronously until the maximum water level is reached. At this point, the sewage supply stops, and the electric heater in the heating chamber 104 is activated to heat the sewage, causing the grease in the sewage to float to the surface and form a grease layer. The pressure plate moves down, simultaneously pumping sewage into the heating chamber 104 and discharging the grease layer at the top of the heating chamber 104 into the separation chamber 105. The principle of placing it into the separation chamber 105 is as follows: the gas supply unit includes a gas collecting hood 111 fixedly installed on the inner partition 102 and a gas collecting pipe 112 connected to the gas collecting hood 111. One end of the gas collecting pipe 112 away from the gas collecting hood 111 is connected to the liquid storage box 113 to supply the gas evaporated in the liquid storage box 113 to the liquid storage box 113. The gas collecting hood 111 has a discharge port 111a. The discharge port 111a is flush with the top of the inner partition 102 located on one side of the liquid storage box 113. When the liquid level in the heating chamber 104 rises, the grease layer flows into the separation chamber 105 from the discharge port 111a, thereby achieving the initial separation of the grease layer in the heating chamber 104 from the sewage. When the liquid level in the separation chamber 105 reaches the preset discharge volume, the accumulated wastewater at the bottom of the separation chamber 105 is pumped into the supply chamber 103a from the conduit 109 by the upward movement of the pressure plate (see reference). Figure 4 (As shown), so that it can be recycled later, reducing the oil content in the wastewater and improving the oil separation effect.

[0013] Secondly, because some wastewater from the heating chamber 104 is also discharged along with the grease layer during each discharge into the separation chamber 105, the grease in the separation chamber 105 will contain wastewater. This results in some wastewater being discharged along with the grease, causing waste. Therefore, based on... Figure 2 , Figure 3 Based on and combined Figure 5 The diagram illustrates the specific structure of the cooling supply mechanism 120. The cooling supply mechanism 120 includes a cooling box 121 with its interior in a conductive state and a dividing plate 122 that fits against the liquid storage box 113. One end of the cooling box 121 passes through the wastewater tank 100 and is connected to a blower 125 that supplies cooling air into the cooling box 121. The cooling box 121 is inclined. The dividing plate 122 is located at the end of the cooling box 121. Under normal conditions, the dividing plate 122 separates the grease layer in the separation chamber 105 from the liquid storage box 113. That is, as the liquid level in the separation chamber 105 continuously rises, when the liquid level reaches a preset discharge amount (i.e., when the liquid level reaches a preset discharge amount), the cooling supply mechanism 120 will continue to supply cooling air into the storage box 113. Figure 5As shown in f2, a layer of grease to solidify is formed at the top of the liquid surface. The dividing plate 122 separates the grease layer from the liquid storage box 113, reducing the accumulation of grease around the liquid storage box 113 and causing the grease to converge towards the center. During the process of liquid level rise in separation chamber 105, grease easily changes from a liquid to a solid state at low temperatures. As the temperature drops, the grease gradually solidifies, forming a solid grease layer floating on the wastewater. Therefore, in order to reduce the solidification rate of the grease during the liquid level rise, combined with... Figure 6 and Figure 7 As shown, a vent pipe 126 is connected between the back of the liquid storage box 113 and the cold capacity box 121 to supply hot gas into the cold capacity box 121. An exhaust pipe 127 is connected to the cold capacity box 121 on the opposite side of the vent pipe 126. The diameter of the exhaust pipe 127 is larger than that of the vent pipe 126 (so that when hot gas is supplied, the pressure inside the cold capacity box 121 is not easily increased). Furthermore, a second one-way valve is installed in the vent pipe 126 to limit the return of gas from the cold capacity box 121. 128; Thus, before the cold energy is delivered to the cold energy box 121, the hot air in the heating chamber 104 is transferred to the liquid storage box 113 through the gas collecting hood 111 and the gas collecting pipe 112. After passing through the liquid storage box 113, the hot air is delivered to the cold energy box 121 through the air guide pipe 126. The delivered hot air flows through the cold energy box 121 to provide auxiliary heating for the grease in the separation chamber 105, thereby slowing down the solidification rate of the grease on the liquid level surface of the separation chamber 105.

[0014] Before the grease layer solidifies, during the formation of the L1 liquid level, the grease entering the separation chamber 105 undergoes two processes. First, the lower end of the feed plate 102a is attached to one side of the dividing plate 122, and the raised end of the inner partition 102 is fixed to it. In this state, the lower end of the feed plate 102a is attached to the dividing plate 122. The grease discharged from the discharge port 111a flows along the feed plate 102a to the cold storage box 121. The cold storage box 121 has several... The dry-supply grease flows through the infusion pipe 121a at the bottom of the separation chamber 105 to guide the grease discharged from the discharge port 111a into the separation chamber 105 for storage. At the same time, since the grease discharged from the heating chamber 104 into the separation chamber 105 has a certain temperature, when the grease drips onto the grease layer through the infusion pipe 121a, it can also heat the grease layer. Furthermore, the potential energy of the dripping grease impacts the formed grease layer, which helps to break the state of the grease layer and slow down the solidification rate. Secondly, when cold air is introduced into the cold air box 121, a discharge channel 113a is formed between the dividing plate 122 and the liquid storage box 113 to discharge grease into the separation chamber 105. The dividing plate 122, corresponding to the cold air box 121, has an exhaust box 124, which is movably disposed at the end of the dividing plate 122. The exhaust box 124 communicates with the opening on the discharge channel 113a, and a compression spring 123 is elastically connected between the dividing plate 122 and the end of the cold air box 121. Therefore, when the grease has not reached the preset discharge amount, the liquid level is at depth L1, and the grease layer is as shown in the figure. The blower is then activated. The blower 125 delivers cold air (originating from cold outdoor air) into the cold storage box 121, and then performs the solidification of the grease layer. The cold air blown into the cold storage box 121 blows towards the side of the liquid storage box 113. Under the influence of action and reaction, the cold air drives the dividing plate 122 to move in the opposite direction against the elastic potential energy of the compression spring 123 (wherein, the thrust generated by the blower 125 under normal conditions depends on its design parameters, operating conditions and gas characteristics, and can be matched with the compression spring 123 according to the specific use, and the thrust generated by the gas blown by the blower 125 is between 50 N and 1000 N). This allows the grease flowing on the discharge plate 102a to be discharged into the separation chamber 105 through the discharge channel 113a, thereby avoiding the solid grease layer from shielding the newly injected grease when the grease layer solidifies, thus preventing the new grease from being injected. Furthermore, since the opening diameter is larger than the diameter of the exhaust pipe 127, when cold air is supplied to the cold energy box 121, the pressure inside the cold energy box 121 is forced to increase, and the supplied cold air is divided into two streams. One stream of cold air is directly discharged from the exhaust pipe 127, and the other stream is blown towards the liquid storage box 113. The thrust generated by the gas overcomes the elastic potential energy of the compression spring 123, causing the dividing plate 122 to separate from the liquid storage box 113.

[0015] During the above process, the hot air inside the liquid storage box 113 is in a circulating state, and the cold air flowing out from the opening can also cool the side wall of the liquid storage box 113. After the hot air is cooled, it will condense into liquid and collect at the bottom of the liquid storage box 113. During this process, although the hot air is transported into the cold volume box 121, the hot air has a smaller impact on the cold air inside the cold volume box 121 compared to the gas flowing inside the cold volume box 121. Then, return to Figure 4 , Figure 5 As shown, when the preset discharge volume is reached, the grease layer solidifies as shown in f2. At the same time, the pressure plate moves up to draw the sewage in the separation chamber 105 into the supply chamber 103a through the conduit 109, so that the liquid level in the separation chamber 105 is reduced to L2. Then, the pressure plate moves down again, and the grease in the heating chamber 104 is discharged into the separation chamber 105.

[0016] Meanwhile, the rising liquid level of the condensed liquid causes the temperature sensing element to move. The specific structure of the temperature sensing element is disclosed below. It includes a push plate 114 positioned below and in contact with the dividing plate 122, and a memory spring 115 located within the storage box 113. The memory spring 115 is situated within a groove formed by the inner partition 102, close to the bottom of the storage box 113. The lower end of the push plate 114 extends into the grease and is used to push the grease layer away from the storage box 113. A sliding rod is fixedly installed between the push plate 114 and the memory spring 115, penetrating the side wall of the storage box 113. At this time, based on... Figure 5 Based on and combined Figure 7 and Figure 8 As shown, the connection between the air duct 126 and the liquid storage box 113 is blocked by the condensed liquid, so the hot air is no longer delivered into the cold storage box 121. The liquid level overflows the groove, causing the memory spring 115 to behave in a soft phase (when there is no liquid in the liquid storage box 113, the memory spring 115 behaves in a hard phase, and when the liquid level overflows the memory spring 115, the memory spring 115 behaves in a soft phase). The memory spring 115 then pushes the slide bar to move, and the push plate 114 pushes the unmelted solidified grease to one side, so that the push plate 114 is away from the liquid storage box 113 and is connected to the upper discharge channel 113a. The grease that passes through the discharge plate 102a slides into the separation chamber 105, avoiding the unmelted solidified grease from forming a barrier to the newly injected grease. In other words, the cold air delivered in the cold air box 121 separates the solidified grease from the wastewater and causes the dividing plate 122 to guide the grease discharged from the heating chamber 104 into the feeding channel 113a, changing the movement path of the grease. At the same time, the cold air provides cooling for the hot air in the liquid storage box 113. The condensed liquid forces the memory spring 115 to push the push plate 114 to move. The push plate 114 pushes the solidified grease to the far end to form an isolation of the solidified grease and receives the grease from the feeding channel 113a, thereby avoiding the solidified grease from obstructing the newly injected grease and improving the grease processing efficiency.

[0017] Then, the cold air supply is stopped, the dividing plate 122 is reset, and the solidified grease falls to the surface of the cold energy box 121. At this time, since the bottom of the liquid storage box 113 is connected to the drain pipe 113b that passes through the sewage tank 100, the liquid level in the separation chamber 105 drops to the outside of the sewage tank 100 located at the lower end of the cold energy box 121. The valve plate is used to block the gap above the lower end of the cold energy box 121 to limit the overflow of grease. By opening the drain pipe 113b to drain the liquid in the liquid storage box 113, the memory spring 115 gradually resets, and the hot air is connected again. At the same time, the valve plate is opened, and the hot air heats the solidified grease on the cold energy box 121 to promote the solidified grease to quickly detach from the cold energy box 121.

[0018] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater solid-liquid separation structure, comprising a wastewater tank (100) and a liquid supply device (101), wherein an inner partition (102) and an outer partition (103) inside the wastewater tank (100) divide the wastewater tank (100) into a liquid supply chamber (103a), a heating chamber (104), a separation chamber (105), and a settling chamber, characterized in that: A liquid collection mechanism (110) is provided on the top of the heating chamber (104). The liquid collection mechanism (110) includes a gas conveying section and a temperature sensing section. The gas venting section is connected to a liquid storage box (113) located in the separation chamber (105). The gas conveying section is covered by an inner partition (102) and is used to guide the evaporated gas in the heating chamber (104) to the liquid storage box (113). When the liquid level in the separation chamber (105) reaches the preset discharge amount, a cooling supply unit located outside the liquid storage box (113) is activated. With the use of the structure (120), the cold supply mechanism (120) can guide the grease discharged from the heating chamber (104) to the separation chamber (105) into the separation chamber (105), and cool the hot air transported in the liquid storage box (113) so as to use the cold energy of the condensed water droplets to drive the temperature sensing part located in the liquid storage box (113) to move. The temperature sensing part is used to push the solidified grease in the separation chamber (105) to the far end to receive the grease discharged from the heating chamber (104) to the separation chamber (105).

2. The wastewater solid-liquid separation structure according to claim 1, characterized in that: The bottom of the inner partition (102) near the outer partition (103) has a through hole (107) connecting the liquid supply chamber (103a) and the heating chamber (104). The top of the outer partition (103) is provided with a hydraulic rod (106), and the bottom of the hydraulic rod (106) has a pressure plate that presses the sewage in the liquid supply chamber (103a) into the heating chamber (104).

3. The wastewater solid-liquid separation structure according to claim 2, characterized in that: A conduit (109) is provided above the through hole (107) to connect the separation chamber (105) and the supply chamber (103a). A first one-way valve (108) is provided in both the conduit (109) and the through hole (107). The first one-way valve (108) located in the through hole (107) is intended to supply the sewage in the supply chamber (103a) to the heating chamber (104). The first one-way valve (108) located in the conduit (109) is intended to return the sewage in the separation chamber (105) to the supply chamber (103a).

4. The wastewater solid-liquid separation structure according to claim 1, characterized in that: The gas supply unit includes a gas collecting hood (111) fixedly mounted on the inner partition (102) and a gas collecting pipe (112) communicating with the gas collecting hood (111). One end of the gas collecting pipe (112) away from the gas collecting hood (111) is connected to the liquid storage box (113) to supply the gas evaporated in the liquid storage box (113) into the liquid storage box (113). The gas collecting hood (111) has a discharge port (111a) which is flush with the top of the inner partition (102) located on one side of the liquid storage box (113).

5. The wastewater solid-liquid separation structure according to claim 4, characterized in that: The cold energy supply mechanism (120) includes a cold energy box (121) with its interior in a conductive state and a dividing plate (122) that fits into the liquid storage box (113). One end of the cold energy box (121) passes through the sewage tank (100) and is connected to a blower (125) that supplies cold air into the cold energy box (121). The cold energy box (121) is inclined. The dividing plate (122) is located at the end of the cold energy box (121). Under normal conditions, the dividing plate (122) is used to separate the grease layer in the separation chamber (105) from the liquid storage box (113).

6. The wastewater solid-liquid separation structure according to claim 5, characterized in that: A gas duct (126) for supplying hot gas into the cold capacity box (121) is connected between the back of the liquid storage box (113) and the cold capacity box (121). An exhaust pipe (127) is connected to the cold capacity box (121) on the opposite side of the gas duct (126). The diameter of the exhaust pipe (127) is larger than the diameter of the gas duct (126), and a second one-way valve (128) for the return of gas in the limited cold capacity box (121) is provided in the gas duct (126).

7. The wastewater solid-liquid separation structure according to claim 5, characterized in that: The lower end of the feed plate (102a) is attached to one side of the dividing plate (122). The raised end of the inner partition (102) is fixedly set with the inner partition (102). The cold storage box (121) has several liquid delivery pipes (121a) for oil to flow through to the bottom of the separation chamber (105) so as to guide the oil discharged from the discharge port (111a) into the separation chamber (105) for storage.

8. The wastewater solid-liquid separation structure according to claim 5, characterized in that: When cold air is introduced into the cold energy box (121), a discharge channel (113a) for discharging grease into the separation chamber (105) is formed between the dividing plate (122) and the liquid storage box (113). The dividing plate (122) corresponding to the cold energy box (121) has an exhaust box (124). The exhaust box (124) is movably disposed at the end of the dividing plate (122). The exhaust box (124) is connected to the opening on the discharge channel (113a). The opening diameter is larger than the pipe diameter of the exhaust pipe (127). A compression spring (123) is elastically connected between the dividing plate (122) and the end of the cold energy box (121).

9. The wastewater solid-liquid separation structure according to claim 5, characterized in that: The temperature sensing unit includes a push plate (114) disposed below and in contact with the dividing plate (122), and a memory spring (115) located in the liquid storage box (113). The memory spring (115) is located in the groove formed by the inner partition (102), and the groove is close to the bottom of the liquid storage box (113). The lower end of the push plate (114) extends into the grease and is used to push the grease layer away from the liquid storage box (113). A slide rod is fixedly disposed between the push plate (114) and the memory spring (115). The slide rod passes through the side wall of the liquid storage box (113). A drain pipe (113b) that passes through the sewage tank (100) is connected to the bottom of the liquid storage box (113).

10. A separation method using the wastewater solid-liquid separation structure described in claim 5, characterized in that, The methods and steps include the following: S1. First, domestic sewage is injected into the settling chamber for settling. After a period of time, the liquid supply device (101) pumps the sewage in the settling chamber into the liquid supply chamber (103a). The sewage is then discharged into the heating chamber (104) after passing through the liquid supply chamber (103a). At the same time, the heater installed in the heating chamber (104) heats the sewage. S2. The grease in the heating chamber (104) floats upward and is discharged into the separation chamber (105). The cold energy box (121) conducts cold energy to the grease, causing the grease to change from liquid to solid at low temperature, so as to form a solid grease layer floating on the sewage. S3. When the oil pollution in the separation chamber (105) reaches the preset discharge amount, the solidified grease is intercepted by the cold energy box (121), while the residual sewage in the separation chamber (105) flows back to the liquid supply chamber (103a).

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