Pretreatment system for biochemical effluent of coking wastewater

Abstract

The utility model discloses a pretreatment system for biochemical effluent of coking wastewater. The pretreatment system comprises an activated carbon powder storage tank, a quantitative weighing device, a vacuum pump, a bag type dust collector, an ejector, a biochemical effluent pipeline, a biochemical effluent sedimentation tank, a reaction tank and a coagulative precipitation tank, the water outlet end of the biochemical water outlet pipeline is communicated with an inlet of the biochemical water outlet sedimentation tank, a supernatant outlet of the biochemical water outlet sedimentation tank is divided into two paths, one path is communicated with an inlet of the reaction tank through a pipeline, and the other path is communicated with a water inlet of the jet device through a pipeline; an outlet of the reaction tank is communicated with an inlet of the coagulative precipitation tank through a pipeline; the device has the advantages that the feeding amount of the activated carbon powder is controllable by adjusting the opening degree of the adjusting valve; the vacuum pump and the bag type dust collector are arranged, so that feeding is smoother, and dust cannot be generated; the activated carbon powder is added in a jet manner, so that the adsorption effect of the activated carbon can be improved, and the treatment effect on biochemical effluent is improved.

Description

Technical field:

[0001] The utility model relates to a pretreatment system for biochemical effluent, in particular to a pretreatment system for biochemical effluent from coking wastewater. Background technology:

[0002] Coking wastewater is a type of high-concentration, difficult-to-degrade wastewater produced during the high-temperature dry distillation of coal, gas purification, and by-product recovery and refining process. Coking wastewater contains a large amount of toxic and harmful substances and is a typical difficult-to-treat industrial wastewater.

[0003] At present, coking wastewater usually passes through the biochemical system to reduce the content of organic matter and harmful substances contained in it. Since the effluent of the biochemical system still cannot meet the reuse standard, it needs to be further treated in the reclaimed water system. However, the COD of the effluent of the biochemical system is generally 200-400 mg / L, while the inlet index of the reclaimed water system is COD content below 50 mg / L. Therefore, in order to meet the inlet requirements of the reclaimed water system, it is often necessary to treat the biochemical effluent through ozone oxidation, photocatalytic oxidation and other methods. However, the problem is that the purchase and maintenance costs are very expensive, which leads to an increase in the treatment cost of coking wastewater treatment and restricts the recycling and reuse of coking wastewater. Utility model content:

[0004] In order to solve the above problems, the purpose of the utility model is to provide a pretreatment system for biochemical effluent of coking wastewater.

[0005] The utility model is implemented by the following technical solutions:

[0006] A pretreatment system for biochemical effluent from coking wastewater, comprising an activated carbon powder storage tank, a quantitative weighing device, a vacuum pump, a bag filter, an ejector, a biochemical effluent pipeline, a biochemical effluent sedimentation tank, a reaction tank and a coagulation sedimentation tank;

[0007] The discharge port at the bottom of the activated carbon powder storage tank is connected to the feed port of the quantitative weighing device through a hose, the air inlet of the vacuum pump is connected to the air outlet of the quantitative weighing device through a pipeline, and the bag dust collector is provided on the pipeline connecting the vacuum pump and the quantitative weighing device; the discharge port of the quantitative weighing device is connected to the feed port at the top of the ejector through a hose, and the outlet of the ejector is connected to the inlet of the reaction tank through a pipeline;

[0008] The water outlet end of the biochemical effluent pipeline is connected to the inlet of the biochemical effluent sedimentation tank. The supernatant outlet of the biochemical effluent sedimentation tank is divided into two paths, one of which is connected to the inlet of the reaction tank through a pipeline, and the other is connected to the water inlet of the ejector through a pipeline; the outlet of the reaction tank is connected to the inlet of the coagulation sedimentation tank through a pipeline;

[0009] A discharge valve is provided at the discharge port of the activated carbon powder storage tank; an activated carbon regulating valve is provided on the hose connecting the quantitative weighing device and the ejector; a water flow regulating valve is provided on the pipeline connecting the biochemical effluent sedimentation tank and the ejector; a water pump is provided at the supernatant outlet of the biochemical effluent sedimentation tank;

[0010] The gravity sensor of the quantitative weighing device is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input ends of the vacuum pump, the discharge valve, the activated carbon regulating valve and the water flow regulating valve respectively.

[0011] Furthermore, the quantitative weighing device includes a bracket, a sealed tank and a gravity sensor;

[0012] The gravity sensor is arranged on the bracket, and the tank body is arranged on the gravity sensor; an air outlet is arranged on the top of the tank body, a feed inlet is arranged on the side wall of the upper part of the tank body, a discharge port is also arranged on the side wall of the tank body, and a discharge hose is arranged in the tank body, and one end of the discharge hose is sealed and fixedly connected to the discharge port;

[0013] A feed valve is provided at the feed inlet of the tank body, and a discharge valve is provided at the discharge outlet of the tank body;

[0014] The signal output end of the controller is also signal-connected to the signal input ends of the feed valve and the discharge valve.

[0015] Furthermore, the other end of the discharge hose is communicated with the interior of the tank body and is provided with a gravity ball.

[0016] Furthermore, the activated carbon powder storage tank is a closed structure, a feeding port is provided on the top of the activated carbon powder storage tank, and a feeding cover is sealed at the feeding port;

[0017] The air outlet of the compressed air source is connected to the upper part of the activated carbon powder storage tank through a pipeline, and an air inlet valve is provided on the pipeline connecting the compressed air source and the activated carbon powder storage tank;

[0018] A pressure sensor is provided in the activated carbon powder storage tank, a signal output end of the pressure sensor is signal-connected to a signal input end of the controller, and a signal output end of the controller is signal-connected to a signal input end of the intake valve.

[0019] Furthermore, there are two quantitative weighing devices, and the two quantitative weighing devices are arranged in parallel.

[0020] Furthermore, a stirrer is provided in the reaction tank.

[0021] Advantages of the utility model:

[0022] Not only can the amount of activated carbon powder added be controlled by adjusting the opening of the regulating valve; but also the installation of a vacuum pump and a bag dust collector can make the feeding smoother and prevent dust from being generated; adding activated carbon powder by jetting can improve the adsorption effect of activated carbon and the treatment effect of biochemical effluent; and the cost of activated carbon powder is relatively low, which can reduce the overall treatment cost of coking wastewater. Description of the drawings:

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 Schematic diagram of system connection of this embodiment;

[0025] Figure 2 This is a control principle diagram of this embodiment.

[0026] In the figure: activated carbon powder storage tank 1, feeding cover 1.1, quantitative weighing device 2, bracket 2.1, tank body 2.2, gravity sensor 2.3, discharge hose 2.4, gravity ball 2.5, vacuum pump 3, bag filter 4, ejector 5, biochemical effluent pipeline 6, biochemical effluent sedimentation tank 7, reaction tank 8, coagulation sedimentation tank 9, compressed air source 10, discharge valve 11, activated carbon regulating valve 12, water flow regulating valve 13, water pump 14, controller 15, air inlet valve 16, pressure sensor 17, agitator 18, feed valve 19, discharge valve 20. Specific implementation method:

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] like Figure 1 , 2A pretreatment system for biochemical effluent from coking wastewater is shown, comprising an activated carbon powder storage tank 1, a quantitative weighing device 2, a vacuum pump 3, a bag filter 4, an ejector 5, a biochemical effluent pipeline 6, a biochemical effluent sedimentation tank 7, a reaction tank 8 and a coagulation sedimentation tank 9; the quantitative weighing device 2 comprises a bracket 2.1, a sealed tank body 2.2 and a gravity sensor 2.3;

[0030] A gravity sensor 2.3 is arranged on the bracket 2.1, and the tank body 2.2 is arranged on the gravity sensor 2.3; an air outlet is arranged on the top of the tank body 2.2, a feed port is arranged on the upper side wall of the tank body 2.2, and a discharge port is also arranged on the side wall of the tank body 2.2. A discharge hose 2.4 is arranged inside the tank body 2.2, one end of the discharge hose 2.4 is sealed and fixedly connected to the discharge port, and the other end of the discharge hose 2.4 is communicated with the inside of the tank body 2.2 and is provided with a gravity ball 2.5. A feed valve 19 is arranged at the feed port of the tank body 2.2, and a discharge valve 20 is arranged at the discharge port of the tank body 2.2.

[0031] The activated carbon powder storage tank 1 is a closed structure, with a feeding port opened on the top of the activated carbon powder storage tank 1, and a feeding cover 1.1 is sealed at the feeding port; the air outlet of the compressed air source 10 is connected to the upper part of the activated carbon powder storage tank 1 through a pipeline, and an air inlet valve 16 is provided on the pipeline connecting the compressed air source 10 and the activated carbon powder storage tank 1; a pressure sensor 17 is provided in the activated carbon powder storage tank 1.

[0032] The discharge port at the bottom of the activated carbon powder storage tank 1 is connected to the feed port of the quantitative weighing device 2 through a hose, the air inlet of the vacuum pump 3 is connected to the air outlet of the quantitative weighing device 2 through a pipeline, and a bag dust collector 4 is provided on the pipeline connecting the vacuum pump 3 and the quantitative weighing device 2; the discharge port of the quantitative weighing device 2 is connected to the feed port at the top of the ejector 5 through a hose, and the outlet of the ejector 5 is connected to the inlet of the reaction tank 8 through a pipeline;

[0033] The outlet end of the biochemical effluent pipeline 6 is connected to the inlet of the biochemical effluent sedimentation tank 7. The supernatant outlet of the biochemical effluent sedimentation tank 7 is divided into two paths, one of which is connected to the inlet of the reaction tank 8 through a pipeline, and the other is connected to the water inlet of the ejector 5 through a pipeline; the outlet of the reaction tank 8 is connected to the inlet of the coagulation sedimentation tank 9 through a pipeline; an agitator 18 is provided in the reaction tank 8.

[0034] A discharge valve 11 is provided at the discharge port of the activated carbon powder storage tank 1; an activated carbon regulating valve 12 is provided on the hose connecting the quantitative weighing device 2 and the ejector 5; a water flow regulating valve 13 is provided on the pipeline connecting the biochemical effluent sedimentation tank 7 and the ejector 5; a water pump 14 is provided at the supernatant outlet of the biochemical effluent sedimentation tank 7;

[0035] The gravity sensor 2.3 and the pressure sensor 17 of the quantitative weighing device 2 are both connected to the signal input end of the controller 15, and the signal output end of the controller 15 is respectively connected to the signal input end of the air intake valve 16, the feed valve 19, the discharge valve 20, the vacuum pump 3, the discharge valve 11, the activated carbon regulating valve 12 and the water flow regulating valve 13.

[0036] In this embodiment, the number of the quantitative weighing devices 2 is two, and the two quantitative weighing devices 2 are arranged in parallel.

[0037] Job Description:

[0038] In this embodiment, organic matter will adhere to the flocs during the biochemical treatment process. Therefore, the biochemical effluent first enters the biochemical effluent sedimentation tank 7 to remove the flocs after biochemical treatment through sedimentation, that is, to achieve mud and water separation; after being pressurized by the water pump 14, a part of it enters the reaction tank 8, and by adding flocculants into the reaction, since the particles of activated carbon powder are relatively small, the activated carbon powder can be flocculated after adding flocculants, and then it is convenient to remove the activated carbon powder by sedimentation; the other part enters the ejector 5, so that negative pressure is formed in the ejector 5, and then it plays a role in sucking the activated carbon powder in the tank body 2.2. The negative pressure is generated by the biochemical water through the ejector 5, which can not only save the amount of industrial water, but also make the activated carbon powder and the biochemical water fully mixed after suction, which is beneficial to the adsorption of the activated carbon powder on the biochemical water. By adding flocculants and activated carbon powder into the reaction tank 8, COD in the biochemical water can be further removed. After the effluent from the reaction enters the coagulation sedimentation tank 9 for sedimentation, the supernatant can meet the water inlet index of the grey water system and can be reused after further treatment in the grey water system.

[0039] In this embodiment, the top of the tank body 2.2 is connected to the negative pressure vacuum pump 3. Under the action of the vacuum pump 3, a negative pressure environment can be formed in the tank body 2.2, so that the activated carbon powder in the activated carbon powder storage tank 1 can be discharged into the tank body 2.2 more smoothly. The upper part of the tank body 2.2 is connected to the ejector 5. Since the ejector 5 is also a negative pressure environment, the activated carbon powder in the tank body 2.2 is sucked into the ejector 5 and enters the reaction tank 8 together with the biochemical water in the ejector 5. A gravity ball 2.5 is provided on the discharge hose 2.4 in the tank body 2.2, which can ensure that the feed end of the discharge hose 2.4 is always located at the bottom of the tank body 2.2, ensuring that the discharge hose 2.4 can absorb materials normally without empty suction.

[0040] In this embodiment, two sets of quantitative weighing devices 2 are provided, and the effect is similar to one for standby and one for use. Before use, according to the total amount of biochemical water entering the reaction pool 8 per hour and the addition ratio of activated carbon powder, the tanks 2.2 of the two sets of quantitative weighing devices 2 are filled with activated carbon powder required for one hour. When in use, one set of quantitative weighing devices 2 first feeds the ejector 5, and by adjusting the opening size of the regulating valve, the activated carbon powder in the tank 2.2 can be evenly sucked into the ejector 5 within one hour. After one hour, the activated carbon powder in the tank 2.2 of the first set of quantitative weighing devices 2 is completely sucked, and at this time, the second set of quantitative weighing devices 2 feeds the ejector 5, and the first set of quantitative weighing devices 2 starts weighing and loading. The specific process is: open the air inlet valve 16 and the discharge valve 11, rush compressed air into the activated carbon powder storage tank 1 to form a positive pressure in the activated carbon powder storage tank 1, open the feed valve 19 of the tank body 2.2 of the first set of quantitative weighing device 2, and discharge the activated carbon powder in the activated carbon powder storage tank 1 into the tank body 2.2 of the first set of quantitative weighing device 2; when the gravity sensor 2.3 detects that the total weight of the tank body 2.2 reaches the preset amount, it means that the amount of activated carbon powder in the tank body 2.2 has reached the amount of activated carbon powder required for one hour, and the air inlet valve 16, the discharge valve 11 and the corresponding feed valve 19 can be closed.

[0041] This embodiment not only realizes controllable dosage of activated carbon powder by adjusting the opening of the regulating valve; but also makes feeding smoother and does not generate dust by arranging the vacuum pump 3 and the bag filter 4; adding activated carbon powder by jetting can improve the adsorption effect of activated carbon and the treatment effect of biochemical effluent; and the cost of activated carbon powder is relatively low, which can reduce the overall treatment cost of coking wastewater.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pretreatment system for biochemical effluent from coking wastewater, characterized in that: It includes activated carbon powder storage tank, quantitative weighing device, vacuum pump, bag dust collector, ejector, biochemical effluent pipeline, biochemical effluent sedimentation tank, reaction tank and coagulation sedimentation tank; The discharge port at the bottom of the activated carbon powder storage tank is connected to the feed port of the quantitative weighing device through a hose, the air inlet of the vacuum pump is connected to the air outlet of the quantitative weighing device through a pipeline, and the bag dust collector is provided on the pipeline connecting the vacuum pump and the quantitative weighing device; the discharge port of the quantitative weighing device is connected to the feed port at the top of the ejector through a hose, and the outlet of the ejector is connected to the inlet of the reaction tank through a pipeline; The water outlet end of the biochemical effluent pipeline is connected to the inlet of the biochemical effluent sedimentation tank. The supernatant outlet of the biochemical effluent sedimentation tank is divided into two paths, one of which is connected to the inlet of the reaction tank through a pipeline, and the other is connected to the water inlet of the ejector through a pipeline; the outlet of the reaction tank is connected to the inlet of the coagulation sedimentation tank through a pipeline; A discharge valve is provided at the discharge port of the activated carbon powder storage tank; an activated carbon regulating valve is provided on the hose connecting the quantitative weighing device and the ejector; a water flow regulating valve is provided on the pipeline connecting the biochemical effluent sedimentation tank and the ejector; a water pump is provided at the supernatant outlet of the biochemical effluent sedimentation tank; The gravity sensor of the quantitative weighing device is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input ends of the vacuum pump, the discharge valve, the activated carbon regulating valve and the water flow regulating valve respectively.

2. A pretreatment system for biochemical effluent from coking wastewater according to claim 1, characterized in that: The quantitative weighing device comprises a bracket, a sealed tank and a gravity sensor; The gravity sensor is arranged on the bracket, and the tank body is arranged on the gravity sensor; an air outlet is arranged on the top of the tank body, a feed inlet is arranged on the side wall of the upper part of the tank body, a discharge port is also arranged on the side wall of the tank body, and a discharge hose is arranged in the tank body, and one end of the discharge hose is sealed and fixedly connected to the discharge port; A feed valve is provided at the feed inlet of the tank body, and a discharge valve is provided at the discharge outlet of the tank body; The signal output end of the controller is also signal-connected to the signal input ends of the feed valve and the discharge valve.

3. A pretreatment system for biochemical effluent from coking wastewater according to claim 2, characterized in that: The other end of the discharge hose is communicated with the interior of the tank body and is provided with a gravity ball.

4. A pretreatment system for biochemical effluent from coking wastewater according to claim 1, characterized in that: The activated carbon powder storage tank is a closed structure, a feeding port is provided on the top of the activated carbon powder storage tank, and a feeding cover is sealed at the feeding port; The air outlet of the compressed air source is connected to the upper part of the activated carbon powder storage tank through a pipeline, and an air inlet valve is provided on the pipeline connecting the compressed air source and the activated carbon powder storage tank; A pressure sensor is provided in the activated carbon powder storage tank, a signal output end of the pressure sensor is signal-connected to a signal input end of the controller, and a signal output end of the controller is signal-connected to a signal input end of the intake valve.

5. A pretreatment system for biochemical effluent from coking wastewater according to claim 1, characterized in that: The number of the quantitative weighing devices is two, and the two quantitative weighing devices are arranged in parallel.

6. A pretreatment system for biochemical effluent from coking wastewater according to claim 1, characterized in that: A stirrer is arranged in the reaction tank.

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