Wastewater treatment system capable of improving clarification effect

Abstract

According to the wastewater treatment system capable of improving the clarification effect provided by the utility model, the baffling efficiency-improving assembly is arranged in the clarification concentrator, and the zigzag baffling channel is arranged between the water inlet at the bottom and the water outlet at the top, so that the water flow path is greatly changed. After wastewater flowing out of the wastewater triple tank enters the clarification concentrator, the water flow speed and flow direction are continuously changed through the baffling channels, so that the retention time of the wastewater in the concentrator is prolonged, and flocculates have more opportunities to collide, gather and settle. Compared with a traditional treatment mode, the conditions that the solid content and the water amount entering the clarification concentrator are too large can be effectively handled, even under the condition that the depth and the volume of the clarification concentrator are limited, the precipitation effect can be remarkably improved, the situation that the water quality of purified water overflowing to the clear water collecting box from the upper portion does not reach the standard is avoided, and the conditions that waste water is discharged beyond the standard and subjected to secondary treatment are reduced; the treatment cost is reduced, and the output of a wastewater system is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment systems that improve clarification effects, and in particular to a wastewater treatment system that improves clarification effects. Background Technology

[0002] Limestone-gypsum wet flue gas desulfurization (FGD) technology is widely used due to its high desulfurization efficiency, high reliability, strong adaptability to different coal types, abundant absorbent resources, comprehensive utilization of by-products, and mature process. The desulfurization wastewater system, as a crucial link in the later stages of the desulfurization process, has a significant impact on the entire system. Insufficient output or substandard effluent quality of the wastewater system will affect the normal operation of the desulfurization system. Currently, the most common wastewater system is the three-tank process. After the desulfurization wastewater is transported to the three-tank, lime slurry is continuously added via metering pumps while being continuously stirred by an agitator in the neutralization tank, thus reducing the Fe3+ in the wastewater. + (Iron), Zn2 + (zinc), Cu2 + (copper), Ni2 + (lithium), Cr3 + Heavy metal ions such as chromium form hydroxide precipitates. At this point, most heavy metal ions in the wastewater form insoluble hydroxides. In the neutralization tank, most heavy metal ions precipitate as hydroxides, and most Pb2+ precipitates out. + (lead), Hg2 + Mercury remains in the wastewater in ionic form. Organic sulfur is added to the reaction tank to react with Pb2. + Hg2 +The reaction forms insoluble sulfides. After chemical precipitation in the neutralization tank, reaction tank, and flocculation tank, the desulfurization wastewater contains many dispersed particles and colloidal substances. Therefore, a flocculant is added to the flocculation tank to cause them to agglomerate into larger particles. A high-molecular-weight polyelectrolyte is added as a coagulant aid at the outlet of the flocculation tank, which gradually transforms the fine flocs into larger, more easily deposited flocs, while also causing the flocs in the wastewater to settle. The flocculated wastewater overflows from the flocculation tank into a clarifier and thickener for clarification and concentration. The flocs settle at the bottom of the tank to form sludge, while the upper part is clean water. The sludge is sent to the sludge dewatering system for treatment, and the upper clean water overflows into a clear water collection tank. Wastewater that meets the standards is discharged through a clear water transfer pump. When the solid content and water volume entering the clarifier are too high, and the depth and volume of the clarifier are insufficient to settle the suspended solids in time, the quality of the purified water overflowing into the clear water collection tank may not meet the discharge requirements, resulting in excessive wastewater discharge or the need to treat the purified water again, increasing treatment costs and significantly reducing the output of the wastewater system. In order to improve the sedimentation effect of the clarifier, some have removed the original clarifier and replaced it with a larger volume clarifier, but this greatly increases the investment cost, and some sites do not have the conditions to replace it with a larger volume clarifier due to the limited space in the wastewater system area. Utility Model Content

[0003] The purpose of this invention is to provide a wastewater treatment system that improves the clarification effect, thereby enhancing the clarification effect and effluent quality of wastewater.

[0004] This utility model provides a wastewater treatment system for improving clarification effect, including a wastewater triplet tank, a clarifier / concentrator, and a clean water collection tank. The clarifier / concentrator is connected to the top of the end side of the wastewater triplet tank, and the clean water collection tank is connected to the top of the side of the clarifier / concentrator. An inlet pipe is installed inside the clarifier / concentrator, and a baffle / efficiency-enhancing component is provided between the inlet pipe and the inner wall of the clarifier / concentrator. The baffle / efficiency-enhancing component includes a bottom inlet and a top outlet, and the bottom inlet and the top outlet are connected by a tortuous baffle channel.

[0005] Furthermore, the flow-deflecting efficiency-enhancing component includes multiple annular bent plates sequentially arranged radially along the water inlet pipe, with the flow-deflecting channel formed between every two annular bent plates.

[0006] Furthermore, each of the aforementioned annular bent plates includes at least two annular baffles.

[0007] Furthermore, the baffle efficiency improvement component also includes a purging pipeline connected to an external compressed air source. The purging pipeline includes multiple purging branch pipes that extend into the interior of the baffle channel. The ends of the purging branch pipes are provided with nozzles for purging the annular bent plate.

[0008] Furthermore, a filter screen is provided inside the deflection channel.

[0009] Furthermore, the included angle between any two vertically connected and fixed baffles is less than 180°.

[0010] Furthermore, the wastewater triplet includes a neutralization tank, a reaction tank, and a flocculation tank connected in sequence, and each of the neutralization tank, reaction tank, and flocculation tank is equipped with a stirrer.

[0011] Furthermore, the bottom of the clean water collection tank is provided with a drain pipe, a drain pump is provided on the drain pipe, and a return pipe is provided on the drain pipe, which is connected to the inlet end of the neutralization tank.

[0012] Furthermore, valves are provided on both sides of the return pipe on the drain pipe.

[0013] Furthermore, the baffle plate is provided with protrusions perpendicular to the water flow direction.

[0014] The beneficial effects of this technical solution are as follows: By installing a baffle-type efficiency-enhancing component within the clarifier, a tortuous baffle channel is established between the bottom inlet and the top outlet, significantly altering the water flow path. When wastewater flowing from the wastewater triplet enters the clarifier, the baffle channel continuously changes the water flow velocity and direction, extending the residence time of the wastewater within the concentrator. This allows flocculants more opportunities to collide, aggregate, and settle. Compared to traditional treatment methods, this solution effectively addresses situations with high solids content and water volume entering the clarifier. Even under conditions of limited depth and volume in the clarifier, it significantly improves sedimentation efficiency, preventing substandard water quality from overflowing into the clear water collection tank, reducing wastewater discharge exceeding standards and requiring secondary treatment. This lowers treatment costs and increases the output of the wastewater system. Furthermore, it eliminates the need to dismantle the existing clarifier and replace it with a larger capacity unit, cleverly solving the problem of limited space on-site where equipment replacement is not feasible. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structural layout of this utility model.

[0017] Figure 2 This is a cross-sectional view of the flow-enhancing component in this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1-Wastewater triplet tank, 101-Neutralization tank, 102-Reaction tank, 103-Flocculation tank, 2-Clarifying and concentrating device, 3-Baffle efficiency improvement component, 301-Annular bent plate, 302-Purge pipeline, 303-Purge branch pipe, 304-Nozzle, 4-Clear water collection tank, 5-Drainage pipe, 6-Drainage pump, 7-Return pipe. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1

[0023] like Figure 1 and Figure 2 As shown, this utility model provides a wastewater treatment system for improving clarification effect, including a wastewater triplet tank 1, a clarifier / concentrator 2, and a clean water collection tank 4. The wastewater triplet tank 1 includes a neutralization tank 101, a reaction tank 102, and a flocculation tank 103 connected in sequence. Each of the neutralization tank 101, reaction tank 102, and flocculation tank 103 is equipped with a stirrer. The clarifier / concentrator 2 is connected to the top of the side of the flocculation tank 103, and the clean water collection tank is connected to the top of the side of the clarifier / concentrator 2. The bottom of the clean water collection tank is equipped with a drain pipe 5, a drain pump 6 is installed on the drain pipe 5, and a return pipe 7 is installed on the drain pipe 5. The return pipe 7 is connected to the inlet end of the neutralization tank 101, and valves are installed on both sides of the return pipe 7 on the drain pipe 5.

[0024] The clarifier 2 has an inlet pipe inside and a sludge discharge port at the center of its bottom for discharging sludge to a sludge filter press. The bottom of the clarifier 2 gradually decreases in height from the periphery towards the sludge discharge port. A baffle assembly 3 is installed between the inlet pipe and the inner wall of the clarifier 2. The baffle assembly 3 includes multiple annular bent plates 301 arranged radially along the inlet pipe, forming a tortuous baffle channel between every two annular bent plates 301. Each baffle channel has a bottom inlet and a top outlet. Each annular bent plate 301 includes at least two vertically fixed annular baffles, with an angle of less than 180° between any two adjacent baffles. The inclined arrangement of the baffles allows the flocculents in the water to impact the baffle surface, ensuring full contact and adhesion of the flocculents.

[0025] To prevent excessive sediment buildup on the baffle plate surface from affecting wastewater flow after prolonged use, the baffle efficiency enhancement component also includes a purging pipeline 302 connected to an external compressed air source. The purging pipeline includes multiple purging branch pipes 303 extending into the interior of the baffle channel. Each branch pipe has a nozzle 304 at its end for purging the annular bent plate. Compressed air is connected to facilitate periodic manual purging. The air purging into the clarifier / concentrator 2 can also reduce COD in the wastewater to some extent. During purging, some flocculants may be carried into the upper clear water layer. Therefore, to ensure the final effluent quality from the clear water collection tank is up to standard, the wastewater can be circulated back into the triplet tank via the return pipe 7 for further treatment within a certain time after purging. The wastewater is then discharged only after it meets the required quality standards.

[0026] To enhance the blocking effect on flocculants, a filter screen can be installed in the baffle channel to block the flocculants.

[0027] Example 2

[0028] The difference between this embodiment and Embodiment 1 is that the baffle plate has protrusions perpendicular to the water flow direction, and the inclined baffle plate can effectively block flocculants. An adsorption layer can be correspondingly provided on the surface of the baffle plate.

[0029] Working principle

[0030] Wastewater flows by gravity from the triplex tank into the inlet pipe of the clarifier 2. The inlet pipe is inserted to the bottom of the clarifier 2, and the wastewater flows from bottom to top. The flocculants in the desulfurization wastewater are deposited at the bottom of the clarifier 2 by gravity and concentrated into sludge, which is removed by the sludge scraper. The clean water rises to the top through the baffle assembly 3. When the wastewater containing flocculants passes through the baffle assembly 3 from bottom to top, the inertial impact of the flocculants promotes the settling of the flocculants, reduces the turbidity of the effluent from the clarifier 2, and improves the quality of the effluent. Meanwhile, during the settling of flocs, the larger the volume of water entering the clarifier 2, the faster the flow rate. The faster the flow rate, the worse the settling effect. Since the depth of the clarifier 2 is fixed, the application of baffles indirectly increases the wastewater flow distance, increases the sedimentation area, and improves the sedimentation efficiency. The baffle channel of the baffle efficiency enhancement component 3 is connected to compressed air through the purge pipe 302 to facilitate manual purging at regular intervals. The air purging into the clarifier 2 can also reduce the COD in the wastewater to some extent. During the purging, some flocs may be carried into the upper clear water layer. Therefore, in order to ensure that the final effluent from the clear water collection tank is qualified, the wastewater can be circulated into the triple tank for reprocessing through the return water pipe within a certain period after purging. The wastewater can be discharged after the water quality is qualified.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wastewater treatment system for improving the clarification effect, characterized by comprising: The waste water triple box, the clarification thickener and the clean water collecting box are communicated with the top end position of the end side of the waste water triple box and the top end position of the side of the clarification thickener, respectively; the inside of the clarification thickener is provided with a water inlet pipe, and a baffling and efficiency improving assembly is arranged between the water inlet pipe and the inner wall of the clarification thickener; the baffling and efficiency improving assembly comprises a bottom water inlet and a top water outlet, and the bottom water inlet and the top water outlet are communicated through a zigzag baffling channel.

2. The wastewater treatment system for improving a clarification effect according to claim 1, characterized by, The baffling and efficiency improving assembly comprises a plurality of annular baffling plate members which are sequentially sleeved along the radial direction of the water inlet pipe, and the zigzag baffling channel is formed between every two annular baffling plate members.

3. The wastewater treatment system for improving a clarification effect according to claim 2, characterized by, Each annular baffling plate member comprises at least two annular baffling plates.

4. The wastewater treatment system for improving a clarification effect according to claim 2 or 3, characterized by, The baffling and efficiency improving assembly further comprises a blowing pipeline which is communicated with an external compressed air source, the blowing pipeline comprises a plurality of blowing branch pipes which extend to the inside of the zigzag baffling channel, and the end of each blowing branch pipe is provided with a nozzle for blowing the annular baffling plate member.

5. The wastewater treatment system for improving the clarification effect according to claim 2 or 3, characterized by, A filter screen is arranged in the zigzag baffling channel.

6. The wastewater treatment system for improving a clarification effect according to claim 3, wherein The included angle between every two annular baffling plates which are fixedly connected in sequence is less than 180°.

7. The wastewater treatment system for improving a clarification effect according to claim 1, characterized by, The waste water triple box comprises a neutralization tank, a reaction tank and a flocculation tank which are communicated in sequence, and each of the neutralization tank, the reaction tank and the flocculation tank is provided with a stirrer.

8. The wastewater treatment system for improving a clarification effect according to claim 7, characterized by, The bottom end of the clean water collecting box is provided with a drain pipe, a drain pump is arranged on the drain pipe, a backflow pipe is arranged on the drain pipe, and the backflow pipe is communicated with the inlet end of the neutralization tank.

9. The wastewater treatment system for improving a clarification effect according to claim 8, characterized by, Valves are arranged on both sides of the backflow pipe on the drain pipe.

10. The wastewater treatment system for improving a clarification effect according to claim 3, characterized by, The baffling plates are provided with convex strips which are perpendicular to the water flow direction.

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