CN216236207U - A multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment - Google Patents

Abstract

The utility model discloses a multi-stage flocculation and precipitation system suitable for garbage leachate pretreatment, which comprises a water inlet pump, a water inlet pipe, a multi-stage flocculation and precipitation tank, a dosing system, a stirrer, a flow meter, a PLC (programmable logic controller) control system and a water outlet, wherein the water inlet pump supplies garbage leachate to the multi-stage flocculation and precipitation tank through the water inlet pipe; a dosing system, a stirrer and a water outlet are arranged on the multi-stage flocculation sedimentation tank, and the dosing system and the water inlet pump are controlled by a PLC control system; the flowmeter is arranged on the water inlet pipe. The flocculation sedimentation system designed by the utility model implements multi-stage flocculation and multi-stage sedimentation, so that the consumption of a flocculating agent can be reduced, and the flocculation sedimentation effect can be improved; the PLC control system realizes multi-party linkage, has high automation degree, is simple and convenient to operate and saves manpower; can simultaneously remove suspended matters, hardness, heavy metals and macromolecular organic matters in the leachate, and greatly reduces the full-quantization treatment difficulty of the leachate.

Description

A multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment

technical field

The utility model belongs to the technical field of sewage treatment sedimentation tanks, in particular to a multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment.

Background technique

The flocculation process is the most basic and extremely important treatment process in the treatment of industrial water and domestic sewage. By adding some chemicals (usually called flocculants and coagulants) to the water, the particles that are difficult to settle in the water can polymerize with each other to form colloids. , which then combine with impurities in the water body to form larger flocs. The floc has a strong adsorption force, which can not only absorb suspended solids, but also absorb some bacteria and dissolved substances. The flocs increase in volume and sink through adsorption. Compared with other physical and chemical methods, the flocculation and sedimentation process has been applied in water treatment for hundreds of years. However, the existing flocculation and sedimentation tanks have poor applicability to landfill leachate pretreatment. This is due to the large variety of pollutants in landfill leachate, high concentrations, and large changes in water quality and water volume. Traditional flocculation and sedimentation tanks not only consume more flocculation and sedimentation tanks. In addition, the flocculation effect is also poor, which leads to many factors that interfere with the reduction of pollutants in the subsequent processes, and furthermore, the difficulty of full quantification treatment increases. To this end, the design and development of a special flocculation sedimentation tank for landfill leachate will contribute to the pretreatment effect of the leachate, thereby laying the foundation for the full-scale treatment of landfill leachate.

Utility model content

Aiming at the deficiencies of the above-mentioned prior art, the utility model invents a multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment.

In order to achieve the above object, the utility model adopts the following technical scheme:

A multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment, comprising an inlet pump, a water inlet pipe, a multi-stage flocculation sedimentation tank, a dosing system, a mixer, a flow meter, a PLC control system and a water outlet, the inlet The water pump supplies waste permeate to the multi-stage flocculation sedimentation tank through the water inlet pipe; the multi-stage flocculation sedimentation tank is provided with a dosing system, an agitator and a water outlet, and the dosing system and the inlet water pump are controlled by a PLC control system; The flow meter is arranged on the water inlet pipe.

Further, the multi-stage flocculation sedimentation tank is composed of multiple groups of reaction units connected in series; the reaction unit includes a reaction tank, a sedimentation tank and a partition, and the reaction tank and the sedimentation tank are separated by a partition; The reaction tank is connected with a dosing system and an agitator is installed independently, and the number of installed reaction units can be selected according to the situation of the leachate.

Further, the partition plate is composed of two wall panels, and the two wall panels are installed in dislocation, one of the wall panels is installed downward, and the other is installed upward, and the two are dislocated from left to right, and the liquid in the reaction tank is removed from the two walls. The gap between the wall panels flows from bottom to top to the sedimentation tank.

Further, the dosing system includes a flocculant tank, a dosing pipe and a metering pump, the flocculant tank is communicated with the reaction tank through the dosing pipe, and a plurality of dosing pipes are connected to the flocculant tank, which can be multiple Each reaction tank provides a flocculant; the dosing pipe is provided with a metering pump, and the metering pump is controlled by a PLC control system.

Further, the PLC control system simultaneously controls multiple metering pumps and multiple agitators, and the same control system controls the operation of the entire multi-stage flocculation and sedimentation system.

Further, the multi-stage flocculation sedimentation tank adopts push-flow inflow water, which can avoid increasing the energy consumption of sewage again, and can also reduce the disturbance to the mixed liquid after flocculation, and increase the flocculation effect.

Further, the effective water depth of the reaction tank and the sedimentation tank in the multi-stage flocculation sedimentation tank decreases sequentially along the liquid flow direction, so as to avoid the mixed liquid in the front and rear tanks from being mixed again, which affects the treatment effect.

Further, the volume of the reaction tank is smaller than that of the sedimentation tank, and the small reaction tank can allow the flocculant to fully react with the pollutants in the leachate to form nucleation, and continue to react in the sedimentation tank with a relatively large space to form large flocs. To achieve rapid sedimentation and separation of mud and water.

Further, it also includes a liquid level gauge, which is installed in the sedimentation tank with the lowest liquid level; the liquid level gauge is telecommunicationly connected with the PLC control system, and the PLC control system controls the work of the inlet pump according to the data monitored by the liquid level gauge, The liquid level gauge is used to monitor the liquid level in the sedimentation tank, and the PLC control system intelligently controls the feed pump, metering pump and agitator through the data monitored by the liquid level gauge.

Further, the liquid level gauge is an ultrasonic level gauge, a float level gauge or a press transmitter

The advantages of the utility model are: the flocculation and precipitation system designed by the utility model implements multi-stage flocculation and multi-stage precipitation, which can not only reduce the amount of flocculant, but also increase the effect of flocculation and precipitation; Form, the flocculant is added from the upper end, and the leachate treatment in the adjacent two tanks does not interfere with each other; the PLC control system realizes multi-party linkage, high degree of automation, easy operation, and labor saving; it can simultaneously remove suspended solids, hardness, and heavy metals in the leachate. And macromolecular organic matter, which greatly reduces the difficulty of fully quantitative treatment of leachate.

Description of drawings

Figure 1 is a schematic front view of a multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment according to the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail:

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by "left", "right", "up", "down", "left", "right", etc. are based on the orientations shown in the accompanying drawings Or positional relationship, or the orientation or positional relationship that the utility model product is usually placed in use, is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, And the specific orientation configuration and operation, therefore, should not be construed as a limitation of the present invention.

As shown in Figure 1, a multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment includes an inlet pump 1, a water inlet pipe 2, a multi-stage flocculation sedimentation tank, a dosing system, a mixer 3, a flow meter 4, a PLC The control system 5, the water outlet 6 and the liquid level gauge 13, the entire multi-stage flocculation sedimentation tank is a reinforced channel steel tank body, and the inside and outside are coated with anti-corrosion materials. The multi-stage flocculation sedimentation tank is composed of multiple groups of reaction units connected in series; the reaction unit includes a reaction tank 7, a sedimentation tank 8 and a partition 9, and the reaction tank 7 and the sedimentation tank 8 are separated by a partition 9, and the reaction tank 7 On the left, the sedimentation tank 8 is on the right, the volume of the reaction tank 7 is smaller than the volume of the sedimentation tank 8, the small reaction tank 7 can make the impurities in the leachate and the flocculant mix more fully, and the large sedimentation tank is convenient for flocculation. precipitation. The other dimensions (length and height) of the reaction tank 7 and the precipitation tank 8 are the same except for the width (the horizontal distance is the width and the vertical distance is the height when viewed from the figure). The partition board 9 is composed of two wall boards, and the two wall boards are installed in dislocation. Under the action of the partition board 9, the liquid flows from bottom to top to the sedimentation tank 8; the distance between the two wall boards is 5cm. The reaction tank 7 is connected with a drug system and independently installed with a stirrer 3 . The agitator 3 includes a stirring motor and a stirring blade. The agitator 3 is installed on the top of the reaction tank 7 facing downwards. The inlet water pump 1 supplies the waste permeate to the multi-stage flocculation sedimentation tank through the inlet pipe 2 , and the flow meter 4 is arranged on the inlet pipe 2 . The water inlet pipe 2 is installed on the left side of the multi-stage flocculation sedimentation tank, that is, the upper part of the leftmost reaction tank 7, and the water outlet 6 is installed on the right side of the multi-level flocculation sedimentation tank, that is, the lower part of the rightmost sedimentation tank. The liquid in the pool flows from left to right. The multi-stage flocculation sedimentation tank adopts the push-flow water inlet, and the effective water depth decreases in turn along the liquid flow direction. A liquid level gauge 13 is installed on the upper part of the sedimentation tank 8 at the far right end. The dosing system, the feed pump 1 , the agitator 3 , the liquid level gauge 13 and the flow meter 4 are electrically connected with the PLC control system 5 . The PLC control system 5 can control the intake pump 1 to stop working according to the data monitored by the liquid level gauge 13 when it is higher than the preset high water level, and control the intake pump 1 to start when the data is lower than the preset low water level.

The dosing system of this embodiment includes a flocculant tank 10 , a dosing pipe 11 and a metering pump 12 . The flocculant tank 10 communicates with the reaction tank 7 through the dosing pipe 11 , and each reaction tank 7 has a separate dosing pipe 11 . A metering pump 12 is arranged on the dosing pipe 11 , and the dosing amount and dosing time of the dosing pump 12 are controlled by the PLC control system 5 . The PLC control system 5 simultaneously controls a plurality of metering pumps 12 to realize unified management and control. The PLC control system 5 can realize that both the metering pump 12 and the agitator 3 are started when the inlet pump 1 is started, and when the inlet pump 1 is stopped, the metering pump 12 is stopped, and the agitator 3 stops after a certain time delay. The PLC control system 5 can control multiple metering pumps 12 and multiple mixers 3 at the same time, and the metering pumps 12 and mixers 13 can also be asynchronously controlled as required.

The inlet pump 1 is a corrosion-resistant submersible pump or a self-priming centrifugal pump. The liquid level gauge 13 is an ultrasonic level gauge, a float level gauge or a press transmitter.

Although the specific embodiments of the present invention have been described and illustrated in detail above, it should be pointed out that various changes and modifications can be made to the above-mentioned embodiments, but these do not depart from the spirit of the present invention and the appended the scope of the claims.

Claims (10)

1. The multi-stage flocculation and precipitation system suitable for landfill leachate pretreatment is characterized by comprising a water inlet pump (1), a water inlet pipe (2), a multi-stage flocculation and precipitation tank, a dosing system, a stirrer (3), a flow meter (4), a PLC (programmable logic controller) control system (5) and a water outlet (6), wherein the water inlet pump (1) supplies landfill leachate to the multi-stage flocculation and precipitation tank through the water inlet pipe (2); the multistage flocculation sedimentation tank is provided with a dosing system, a stirrer (3) and a water outlet (6), and the dosing system and the water inlet pump (1) are controlled by a PLC control system (5); the flowmeter (4) is arranged on the water inlet pipe (2).

2. The multi-stage flocculation sedimentation system suitable for landfill leachate pretreatment of claim 1, wherein the multi-stage flocculation sedimentation tank is composed of a plurality of groups of reaction units connected in series; the reaction unit comprises a reaction tank (7), a precipitation tank (8) and a partition plate (9), wherein the reaction tank (7) is separated from the precipitation tank (8) through the partition plate (9); the reaction tank (7) is connected with a dosing system and is independently provided with a stirrer (3).

3. The multistage flocculation and precipitation system for the pretreatment of landfill leachate according to claim 2, wherein the partition (9) is composed of two wall panels, and the two wall panels are installed in a staggered manner.

4. The multistage flocculation and precipitation system suitable for landfill leachate pretreatment according to claim 3, wherein the dosing system comprises a flocculant tank (10), a dosing pipe (11) and a metering pump (12), the flocculant tank (10) is communicated with the reaction tank (7) through the dosing pipe (11); the dosing pipe (11) is provided with a metering pump (12).

5. The multistage flocculation and precipitation system for landfill leachate pretreatment of claim 4, wherein the PLC control system (5) controls a plurality of metering pumps (12) and a plurality of agitators (3) simultaneously.

6. The multi-stage flocculation and sedimentation system for landfill leachate pretreatment of claim 5, wherein the multi-stage flocculation and sedimentation tank adopts plug flow type influent water.

7. The multistage flocculation and precipitation system suitable for landfill leachate pretreatment of claim 6, wherein the effective water depth of the reaction tank (7) and the precipitation tank (8) in the multistage flocculation and precipitation tank is sequentially reduced along the liquid flowing direction.

8. The multistage flocculation and precipitation system for landfill leachate pretreatment of claim 7, wherein the volume of the reaction tank (7) is smaller than the volume of the precipitation tank (8).

9. The multistage flocculation and precipitation system suitable for landfill leachate pretreatment of any of claims 1-8, characterized in that, further comprising a liquid level meter (13), wherein the liquid level meter (13) is installed in the precipitation tank (8) with the lowest liquid level; the liquid level meter (13) is in telecommunication connection with the PLC control system (5), and the PLC control system (5) controls the work of the water inlet pump (1) according to data monitored by the liquid level meter (13).

10. The multistage flocculation and precipitation system suitable for landfill leachate pretreatment of claim 9, wherein the level meter (13) is an ultrasonic level meter, a floating ball level meter or a press transducer.

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