CN115991526A - A settling device and wastewater treatment method for continuously treating wastewater - Google Patents

Abstract

The invention discloses a sedimentation device for continuously treating wastewater and a wastewater treatment method, wherein the sedimentation device comprises a sedimentation zone, a sedimentation zone and a supernatant zone; the sedimentation zone is communicated with the lower side of the sedimentation zone, and a feed inlet is formed in the upper part of the sedimentation zone; the sedimentation zone is communicated with the supernatant zone through a supernatant overflow outlet positioned at the upper part, a slow flow component is arranged in the sedimentation zone, and a sediment outlet is formed in the bottom of the sedimentation zone; the upper part of the supernatant area is provided with a supernatant outlet; a liftable stirrer is arranged in the sedimentation zone, and the wastewater treatment method is based on the sedimentation device; the invention has reasonable design and ingenious structure, is used for continuously treating fluoride-containing wastewater, and solves the problems of high energy consumption and high cost of the traditional process.

Description

A settling device and wastewater treatment method for continuously treating wastewater

technical field

The invention relates to the field of wastewater treatment, in particular to a sedimentation device for continuously treating wastewater.

Background technique

The existing industrial treatment of fluoride-containing wastewater, one is to react through a batch reactor to form a precipitate, and then centrifugally filter; the traditional operation process through a batch reactor is an intermittent operation, and the disadvantage is that the material is not continuous, and the material is easy to Blockage, poor circulation, recrystallization solvent cannot be recycled, and the operation process needs to be intermittently operated, which consumes a lot of manpower and time, and the work efficiency is low. Another kind of membrane technology filtration has the disadvantages of high equipment investment cost, low processing efficiency of a single device, multiple devices are required to be used together in series, and at the same time, the concentration of wastewater is high, the process operation is difficult, and the filter membrane is a consumable part. Membrane maintenance costs are high.

Contents of the invention

Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a reasonable design and ingenious structure of a precipitation device for continuous treatment of fluoride-containing wastewater.

Specifically, a settling device for continuously treating waste water, including a settling area, a settling area and a supernatant liquid area;

The settling zone communicates with the lower side of the settling zone, and a feeding port is opened on the upper part of the settling zone;

The settling area is communicated with the supernatant liquid area through the supernatant liquid overflow port on the upper part, a slow flow assembly is installed in the settling area, and a sedimentation outlet is opened at the bottom of the settling area;

The upper part of the supernatant area is provided with a supernatant outlet.

Optionally, a liftable agitator is installed in the settling area.

Optionally, the slow flow assembly includes a bracket and several slow flow plates, at least one slow flow plate is installed on the inner wall of the settling area, and the slow flow plate is installed obliquely downward, and the support is fixedly installed in the settling area In the middle of the bracket, at least one slow flow plate is installed on the bracket, and the slow flow plate on the inner wall is misaligned with the slow flow plate on the bracket.

Optionally, the slow flow plate on the inner wall and the slow flow plate on the bracket are parallel to each other.

Optionally, a supernatant partition is installed in the middle of the supernatant area, and the supernatant partition can be disassembled and can be installed on the bottom and top layers of the supernatant area; the supernatant partition can longitudinally cut off the liquid, and the liquid It can only pass through the upper or lower end of the supernatant separator.

Optionally, dose meters and controllable valves are installed at the feed inlet, sediment outlet and supernatant outlet.

Preferably, the wastewater is fluoride-containing wastewater, or the fluoride-containing wastewater is mixed with a precipitant.

On the other hand, the present invention also provides a wastewater treatment method using the above-mentioned precipitation device, comprising the following steps

Add wastewater and precipitant to the precipitation zone for stirring reaction;

The above-mentioned reaction solution is drained from bottom to top in the settling area to settle, the supernatant is discharged from the top, and the precipitate is discharged downward;

Drain the above supernatant to the supernatant area, circulate through the separator and then discharge.

Optionally, several circulation plates are installed in the settling area to carry out circulation settling.

Optionally, after the stirring reaction, a precipitate and a clear liquid are generated, and the precipitate and clear liquid flow to the precipitation area due to the liquid head difference, and the precipitate and the clear liquid enter the centrifuge through the outlet at the bottom of the precipitation area for separation to obtain solid waste; wherein, the centrifuged clear liquid returns to the At the same time, the supernatant and a small amount of sediment in the sedimentation area are affected by the slow flow plate, the sediment is blocked and sinks, the supernatant moves up, and enters the supernatant area through the supernatant overflow port. After settling, discharge the supernatant through the supernatant discharge port.

The present invention has the following advantages:

The invention is reasonable in design and ingenious in structure. It is used for continuous treatment of fluoride-containing wastewater, and can solve the problem of discontinuous materials in traditional batch reactors, easy blockage of materials, poor circulation, recrystallization solvents that cannot be recycled, and intermittent operations required in the operation process, which consumes a lot of energy. A lot of manpower and time, the problem of low work efficiency.

At the same time, it can also overcome membrane technology filtration, high equipment investment cost, low processing efficiency of a single device, multiple devices are required to be used in series, and at the same time, the concentration of wastewater is high, and the process operation is difficult. The filter membrane is a consumable part, and the later filter membrane The problem of high maintenance costs.

When the present invention is used, both the fluoride-containing wastewater and the precipitant enter through the feed inlet, and the feed inlet can control the flow of the fluoride-containing wastewater and the precipitant respectively; at the same time, by adjusting the height, rotation speed and shape of the stirring blade of the liftable agitator , so that the fluoride-containing wastewater and the precipitant react quickly in the upper layer after entering the precipitation area, and the generated sediment sinks rapidly under the stirring force; the sediment outlet is connected to the pump, which can control the discharge speed, and at the same time the sediment outlet Designed as an inverted triangle, it is convenient for the accumulation and centralized discharge of sediment. The slow flow plate can effectively block the upward movement of sediment in the liquid, and the supernatant separator can block the supernatant from the supernatant overflow port from flowing out directly, increasing the stroke of the supernatant. The outlet of the supernatant liquid is connected with a water pump to control the discharge speed.

Description of drawings

Fig. 1 is a schematic view of the structure of the precipitation device of the present invention;

Fig. 2 is a schematic diagram of the installation structure of the slow flow plate of the present invention;

Fig. 3 is a schematic flow sheet of the wastewater treatment method of the present invention;

In the figure: 1. Precipitation area; 2. Settling area; 3. Supernatant area; 4. Feed inlet; 5. Stirrer; 6. Sediment outlet; 71. Support; Supernatant liquid overflow port; 9. Supernatant liquid separator; 10. Supernatant liquid discharge port.

Detailed ways

The present invention will be described in detail below in conjunction with accompanying drawing 1, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The existing industrial treatment of fluoride-containing wastewater, one is to react through a batch reactor to form a precipitate, and then centrifugally filter; the traditional operation process through a batch reactor is an intermittent operation, and the disadvantage is that the material is not continuous, and the material is easy to Blockage, poor circulation, recrystallization solvent cannot be recycled, and the operation process needs to be intermittently operated, which consumes a lot of manpower and time, and the work efficiency is low. Another kind of membrane technology filtration has the disadvantages of high equipment investment cost, low processing efficiency of a single device, multiple devices are required to be used together in series, and at the same time, the concentration of wastewater is high, the process operation is difficult, and the filter membrane is a consumable part. Membrane maintenance costs are high.

Based on the above problems, a settling device for continuous treatment of fluoride-containing wastewater is provided, including a settling zone 1, a settling zone 2 and a supernatant zone 3;

The settling zone 1 communicates with the lower side of the settling zone 2, and a feeding port 4 is opened on the upper part of the settling zone 1;

The settling zone 2 communicates with the supernatant zone 3 through the supernatant overflow port 8 at the top, a slow flow assembly is installed in the settling zone 2, and a sedimentation outlet 6 is provided at the bottom of the settling zone 6 ;

A supernatant outlet 10 is opened on the upper part of the supernatant area 3 .

Optionally, the liquid level of the supernatant overflow port is higher than the liquid level of the supernatant discharge port, the liquid level difference facilitates the liquid to flow out of the supernatant liquid discharge port, and the discharge speed of the supernatant liquid discharge port Less than the total feed rate of the feed port; the supernatant discharge port can also return the discharged liquid to the feed port.

In one embodiment, the discharge velocity of the sediment outlet is less than the total feed velocity of the feed inlet; the sediment outlet can also return the discharged liquid to the feed inlet.

In one embodiment, a liftable agitator 5 is installed in the precipitation zone 1 . It can be adjusted according to different process requirements. When using it, adjust the height and speed of the agitator, and change the shape of the stirring blade, so that the fluoride-containing wastewater and the precipitant react quickly in the upper layer after entering the precipitation area, and the generated precipitate is stirred and rotated. At the same time, the agitator 5 can form a vortex-like water flow, so that the fluoride-containing wastewater and the precipitant can be mixed quickly after entering the precipitation area, and the generated sediment is affected by the downward swirling water flow, which accelerates the sinking. The agitator is installed on the upper cover of the precipitation area, and the upper cover is detachable; by removing the upper cover, the agitator is taken out together, and then the stirring blades are replaced; the motor of the agitator is above the upper cover, and the motor of the agitator is lifted Adjust the height of the stirring blade in the precipitation area.

In one embodiment, the slow flow assembly includes a bracket 71 and several slow flow plates 72. At least one slow flow plate 72 is installed on the inner wall of the settling area 2, and the slow flow plate is installed inclined downward. The support 71 It is fixedly installed in the middle of the settling area 2, and the support 71 is equipped with at least one slow flow plate 72, and the slow flow plate on the inner wall and the slow flow plate on the support are misplaced and installed. Optionally, the slow flow plate on the inner wall and the slow flow plate on the bracket are parallel to each other; the upward movement of sediment in the liquid can be effectively blocked by setting the slow flow plate. The slow flow plate is detachable and has different Specification. As shown in Figure 2, the slow flow plate is installed by opening the upper cover of the sedimentation area and opening V-shaped hanging grooves on both sides of the sedimentation area, and one end of the slow flow plate is inserted into the V-shaped hanging groove; in order to facilitate fixing, bolts can be used fasten.

In one embodiment, the slow flow plates can be installed on both sides of the settling area and on the middle support, and the height and quantity can be adjusted. Among them, the slow flow plate is mainly used for the upward movement of less sediment, and the up and down fluctuation of the liquid in the gentle settlement area.

In one embodiment, a supernatant separator 9 is installed in the middle of the supernatant region 3, and the supernatant separator can be disassembled (installed by opening the upper cover of the supernatant region, and can be installed by bolts to facilitate disassembly), can be installed in the bottom and top layers of the supernatant liquid area; the supernatant liquid partition will cut off the liquid longitudinally, and the liquid can only pass through the upper or lower end of the supernatant liquid partition. The supernatant separator can prevent the supernatant from the supernatant overflow port from flowing out directly, increasing the stroke of the supernatant. According to different process requirements, the supernatant separator has different specifications.

In one embodiment, the feed inlet 4, the sediment outlet 6 and the supernatant liquid outlet 10 are all equipped with a dose meter and a controllable valve; the flow meter and the controllable valve can control the flow rate of the incoming and outgoing materials flow.

In one embodiment, when the settling device for continuous wastewater treatment is in use, the fluoride-containing wastewater and the precipitant enter into the settling area through the feed inlet, and are affected by the liftable agitator, the fluoride-containing wastewater and the The precipitant mixes quickly to form fluoride precipitation; the fluoride precipitation is affected by the water flow vortex formed by the stirring of the liftable agitator, and rotates and sinks to reach the bottom of the sedimentation area; because the liquid level of the sedimentation area is higher than that of the sedimentation area, the downward spiral sedimentation After the fluoride precipitation and liquid reach the bottom of the sedimentation zone, they quickly flow to the bottom of the sedimentation zone; after the fluoride precipitation reaches the bottom of the sedimentation zone, the kinetic energy of its upward movement is slowed down by the barrier of the slow flow plate, and finally it falls to the sedimentation zone under the influence of gravity. At the bottom of the sedimentation zone, it is discharged together with the sediment outlet and the liquid; because the liquid discharge speed of the sediment outlet is slower than the feeding speed of the feed inlet; the liquid level in the sedimentation zone rises slowly, and finally comes to the supernatant through the supernatant overflow outlet liquid area; in order to further avoid fluoride precipitation in the supernatant liquid area and flow out with the supernatant liquid; multiple partitions are set up and down in the supernatant liquid area to slow down the kinetic energy of fluoride precipitation in the liquid and make it further A precipitate is obtained, and finally the supernatant is discharged from the supernatant outlet.

In another embodiment, as shown in Figure 3, a wastewater treatment method using the above-mentioned sedimentation device includes the following steps

Add wastewater and precipitant to the precipitation zone for stirring reaction;

The above-mentioned reaction solution is drained from bottom to top in the settling area to settle, the supernatant is discharged from the top, and the precipitate is discharged downward;

Drain the above supernatant to the supernatant area, circulate through the separator and then discharge.

Optionally, several circulation plates are installed in the settling area to carry out circulation settling.

Optionally, after the stirring reaction, a precipitate and a clear liquid are generated, and the precipitate and clear liquid flow to the precipitation area due to the liquid head difference, and the precipitate and the clear liquid enter the centrifuge through the outlet at the bottom of the precipitation area for separation to obtain solid waste; wherein, the centrifuged clear liquid returns to the At the same time, the supernatant and a small amount of sediment in the sedimentation area are affected by the slow flow plate, the sediment is blocked and sinks, the supernatant moves up, and enters the supernatant area through the supernatant overflow port. After settling, discharge the supernatant through the supernatant discharge port.

This method can solve the problems of discontinuous materials in traditional batch reactors, easy blockage of materials, poor circulation, non-recyclable recrystallization solvents, intermittent operations in the operation process, large manpower and time consumption, and low work efficiency.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A settling device for continuously treating waste water, characterized in that: it comprises a settling area (1), a settling area (2) and a supernatant liquid area (3); The settling zone (1) communicates with the lower side of the settling zone (2), and a feed inlet (4) is opened on the upper part of the settling zone (1); The settling area (2) communicates with the supernatant liquid area (3) through the upper supernatant liquid overflow port (8), and a slow flow component is installed in the settling area (2), and the settling area ( 6) There is a sediment outlet (6) at the bottom; A supernatant outlet (10) is opened on the upper part of the supernatant area (3). 2. A settling device for continuous wastewater treatment according to claim 1, characterized in that: a liftable agitator (5) is installed in the settling area (1). 3. A settling device for continuously treating wastewater according to claim 1, characterized in that: the slow flow component includes a bracket (71) and several slow flow plates (72), and in the settling area (2) There is at least one slow flow plate (72) on the inner wall, the slow flow plate is installed inclined downward, the bracket (71) is fixedly installed in the middle of the settlement area (2), and the bracket (71) is installed with at least one slow flow plate The flow plate (72), the slow flow plate positioned at the inner wall and the slow flow plate positioned at the support are misplaced and installed. 4 . The settling device for continuously treating wastewater according to claim 3 , wherein the slow flow plate on the inner wall and the slow flow plate on the bracket are parallel to each other. 5. A settling device for continuous wastewater treatment according to claim 1, characterized in that: a supernatant partition (9) is installed in the middle of the supernatant area (3), and the supernatant partition is installed In the bottom layer or the top layer of the supernatant area; in the upper or lower part of the upper supernatant to form a channel. 6. A settling device for continuous wastewater treatment according to claim 1, characterized in that: the feed inlet (4), the sediment outlet (6) and the supernatant outlet (10) are all equipped with dosage gauges and controllable valves. 7. A precipitation device for continuous wastewater treatment according to any one of claims 1-6, characterized in that: the wastewater is wastewater containing fluoride, or wastewater containing fluoride is mixed with a precipitant. 8. A method for treating wastewater using a settling device according to any one of claims 1-7, characterized in that it comprises the following steps Add wastewater and precipitant to the precipitation zone for stirring reaction; The above-mentioned reaction solution is drained from bottom to top in the settling area to settle, the supernatant is discharged from the top, and the precipitate is discharged downward; Drain the above supernatant to the supernatant area, circulate through the separator and then discharge. 9 . A wastewater treatment method according to claim 8 , characterized in that, several circulation plates are installed in the settling zone to carry out circulation settlement. 10 . 10. A kind of waste water treatment method according to claim 9, it is characterized in that, after stirring reaction, generate precipitation and supernatant liquid, sedimentation and supernatant liquid are subjected to liquid level difference to flow to sedimentation area, precipitation and supernatant liquid go in and centrifuge through outlet at the bottom of sedimentation area The centrifuge is separated to obtain solid waste; among them, the centrifuge supernatant flows back into the precipitation area; at the same time, the supernatant and a small amount of sediment in the sedimentation area are affected by the slow flow plate, the sediment is blocked and sinks, the supernatant moves upward, and passes through the supernatant The liquid overflows into the supernatant area, and after settling in the supernatant area, the supernatant is discharged through the supernatant outlet.

Images