CN216918732U

CN216918732U - Reaction system for reducing formaldehyde content of aqueous solution

Info

Publication number: CN216918732U
Application number: CN202220419760.6U
Authority: CN
Inventors: 贾晓琴; 潘玮; 徐志刚; 王天宇; 庞方亮; 沈寒冰; 王飞; 余支明
Original assignee: Chongqing Kopper Chemical Industry Co ltd
Current assignee: Chongqing Kopper Chemical Industry Co ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-07-08
Anticipated expiration: 2032-02-28

Abstract

The utility model relates to the technical field of formaldehyde wastewater treatment, in particular to a reaction system for reducing the formaldehyde content of an aqueous solution, which comprises: the liquid caustic soda tank is connected with a reaction tank, the reaction tank is connected with a water inlet pipe and a water outlet pipe, and a heater is arranged outside the reaction tank; the reactor is characterized in that a stirrer is arranged inside the reaction tank, the stirrer is connected with a motor, the motor is connected with a controller, the motor is used for driving the stirrer to rotate, and the controller is used for controlling the running state of the motor. The utility model simplifies the treatment process of the formaldehyde aqueous solution, does not need to add calcium hydroxide when treating the next batch of formaldehyde aqueous solution, has more controllable stirring and high automation degree, is beneficial to streamlined treatment, solves the technical problem of complex process for reducing the formaldehyde content of the aqueous solution in the prior art, and can reduce the formaldehyde content to below 50ppm and directly degrade bacteria.

Description

Reaction system for reducing formaldehyde content of aqueous solution

Technical Field

The utility model relates to the technical field of formaldehyde wastewater treatment, in particular to a reaction system for reducing the formaldehyde content of an aqueous solution.

Background

Formaldehyde is an organic chemical substance, has a chemical formula of HCHO, is colorless and irritant gas, has an irritant effect on human eyes, nose and the like, is easily soluble in water and ethanol, and has a maximum concentration of 55% in an aqueous solution. In chemical production, the wastewater containing formaldehyde is used or generated, the wastewater contains a large amount of formaldehyde, the concentration of the formaldehyde can even reach more than 10000mg/L, the formaldehyde degradation capability of bacteria is only 50mg/L, namely the bacteria can only degrade the wastewater with the formaldehyde concentration lower than 50mg/L, if the wastewater with the formaldehyde concentration higher than 50mg/L is directly discharged to a sewage station, the degradation capability of the bacteria is exceeded, the formaldehyde in the wastewater cannot be degraded, the bacteria and microorganisms in the sewage station are slowly poisoned and even killed, and the treatment capability of the sewage station is reduced and even collapsed. Due to this, the formaldehyde in the wastewater is usually pretreated by the related art for treating formaldehyde to reduce its concentration, and then discharged to a sewage station to be degraded by bacteria.

At present, the lime method is generally adopted for treatment, and the principle is as follows: firstly, the pH value of the feed liquid is adjusted to be 11-12, then calcium hydroxide is added, heating is carried out, the temperature of 70 ℃ is kept, stirring is carried out for 1-2 hours, and sampling is carried out after reaction until the content of formaldehyde in the feed liquid is less than 50 ppm. The method reduces the formaldehyde content of the aqueous solution, needs to add lime as a catalyst every time, and needs to separately treat the calcium hydroxide generated after the reaction, thereby having complex treatment procedures.

SUMMERY OF THE UTILITY MODEL

The utility model provides a reaction system for reducing the formaldehyde content of an aqueous solution, which solves the technical problem of complex process for reducing the formaldehyde content of the aqueous solution in the prior art.

The basic scheme provided by the utility model is as follows: a reaction system for reducing the formaldehyde content of an aqueous solution comprising: the liquid caustic soda tank is connected with a reaction tank, the reaction tank is connected with a water inlet pipe and a water outlet pipe, and a heater is arranged outside the reaction tank; the reactor is characterized in that a stirrer is arranged inside the reaction tank, the stirrer is connected with a motor, the motor is connected with a controller, the motor is used for driving the stirrer to rotate, and the controller is used for controlling the running state of the motor.

The working principle and the advantages of the utility model are as follows:

(1) the method comprises the steps of firstly adding calcium hydroxide into a formaldehyde aqueous solution (namely, wastewater containing formaldehyde), then gradually adding liquid alkali into the formaldehyde aqueous solution, adjusting the pH value of the formaldehyde aqueous solution to 11-12 by using the liquid alkali, simultaneously heating the formaldehyde aqueous solution to gradually raise the temperature to 70 ℃, preserving the temperature for 2 hours, standing for 1 hour, then taking a supernatant for analysis, and discharging the supernatant if the formaldehyde content of the supernatant is less than 50 ppm.

(2) In the process of formaldehyde reaction, the stirrer is continuously stirred, so that the mixing is more uniform, the heating and the reaction are more uniform, the reaction speed is improved, the effective exertion of the calcium hydroxide catalysis effect is promoted, and the treatment efficiency is improved; meanwhile, the stirrer is controlled by the motor to rotate, the running state of the motor is controlled by the controller, for example, the starting, stopping, rotating speed, running time and the like of the motor can be controlled by the controller, so that the stirring is more regular and controllable, the stirring quality is improved, the formaldehyde can be reacted efficiently, the automation degree is high, and the flowing water treatment is facilitated.

The utility model simplifies the treatment process of the aqueous solution of formaldehyde, does not need to add calcium hydroxide when treating the aqueous solution of formaldehyde of the next batch, has more controllable stirring and high automation degree, is beneficial to streamlined treatment and solves the technical problem of complex process for reducing the content of formaldehyde in the aqueous solution in the prior art.

Furthermore, a flowmeter is arranged on the water inlet pipe, and the flowmeter is in signal connection with the controller; when the flow is not zero, the controller controls the motor to start, and when the flow is zero, the controller controls the motor to stop.

Has the advantages that: the flow is not zero, which indicates that the formaldehyde solution enters the reaction tank, otherwise, the flow is zero, which indicates that no formaldehyde solution enters the reaction tank, so that the stirrer is always in a working state in the process of entering the formaldehyde solution, which is beneficial to rapid and uniform mixing and improves the reaction rate.

Furthermore, the water inlet pipe is connected with a first pump body, the water outlet pipe is connected with a second pump body, and the second pump body is in signal connection with the controller; and after the controller controls the motor to stop for a first time, the controller controls the second pump body to operate for a second time.

Has the advantages that: after the stirrer stops stirring, the reaction tank is kept stand for a first time, the controller controls the second pump body to operate for a second time and then supernatant is discharged, manual participation is not needed, and the automation degree is high.

Further, the liquid caustic soda jar is located the retort top, the liquid caustic soda jar with be equipped with the valve between the retort.

The beneficial effects are that: the liquid caustic soda tank is arranged above the reaction tank, when liquid caustic soda is needed, only the valve needs to be opened, and when the liquid caustic soda is not needed, only the valve needs to be closed, so that the liquid caustic soda is added by utilizing the action of gravity, and the method is convenient and fast.

Furthermore, the water inlet pipe and the water outlet pipe are internally provided with filter screens.

Has the advantages that: the filter screen of setting in the inlet tube can filter the impurity in the formalin, and the filter screen of setting in the outlet pipe can filter the impurity in the supernatant, prevents that inlet tube and outlet pipe from blockking up.

Furthermore, a reinforcing rib is arranged outside the reaction tank.

Has the advantages that: the structural strength of the reaction tank is increased, and the working reliability is improved.

Further, a support is arranged at the bottom of the heater.

Has the advantages that: prevent heater and ground contact and wet, prolong the life of heater.

Further, handles are arranged on two sides of the bottom of the heater.

Has the advantages that: the carrying is convenient, and the position is moved according to actual needs.

Further, the reaction tank is oval, and the heater is U-shaped.

Has the advantages that: is convenient for installation and processing and manufacturing.

Furthermore, the inner wall surface of the reaction tank is provided with scales.

Has the advantages that: the volume in the reaction tank is convenient to observe.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a reaction system for reducing the formaldehyde content of an aqueous solution according to the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

the reference numbers in the drawings of the specification include: the device comprises a liquid caustic soda tank 1, a reaction tank 2, a water inlet pipe 3, a water outlet pipe 4, a stirrer 5, a motor 6, a controller 7, a flowmeter 8, a first pump body 9, a second pump body 10, a valve 11, a reinforcing rib 12, a support 13, a handle 14 and a liquid level 15.

Example 1

An embodiment is substantially as shown in figure 1, comprising: the device comprises a liquid caustic soda tank 1, wherein the liquid caustic soda tank 1 is connected with a reaction tank 2 through a guide pipe, the reaction tank 2 is connected with a water inlet pipe 3 and a water outlet pipe 4 through screws, one end of the water outlet pipe 4 is positioned below the liquid level 15 in the reaction tank 2, and a heater is fixedly arranged outside the reaction tank 2 through screws; the reaction tank 2 is oval, and the heater is U-shaped, so that the installation and the processing and manufacturing are convenient; scales are arranged on the inner wall surface of the reaction tank 2, so that the residual capacity in the reaction tank 2 can be observed conveniently; the reaction tank 2 is internally provided with a stirrer 5, the stirrer 5 is a propeller with a rotating shaft, the stirrer 5 is in signal connection with a motor 6 (both wired and wireless), the motor 6 is in signal connection with a controller 7 (both wired and wireless), the motor 6 is used for driving the stirrer 5 to rotate, the controller 7 is used for controlling the running state of the motor 6, and for example, the starting, stopping, rotating speed, running time and the like of the motor 6 can be controlled by the controller 7.

In this embodiment, a flowmeter 8 is fixedly arranged on the water inlet pipe 3 through a screw, and the flowmeter 8 is in signal connection with the controller 7; when the flow is not zero, the controller 7 can control the motor 6 to start, and when the flow is zero, the controller 7 can control the motor 6 to stop. The flow is not zero, which indicates that the formaldehyde solution enters the reaction tank 2, and conversely, the flow is zero, which indicates that no formaldehyde solution enters the reaction tank 2, so that the stirrer 5 is always in a working state in the process of entering the formaldehyde solution, which is beneficial to rapid and uniform mixing and improves the reaction rate. The water inlet pipe 3 is fixedly connected with a first pump body 9 through screws, the water outlet pipe 4 is fixedly connected with a second pump body 10 through screws, and the second pump body 10 is in signal connection with the controller 7; after the controller 7 controls the motor 6 to stop for a first period of time, for example, the first period of time is 10 minutes, the controller 7 controls the second pump body 10 to operate for a second period of time, for example, the second period of time is 30 seconds. After the stirrer 5 stops stirring and the reaction tank 2 is kept still for 10 minutes, the controller 7 controls the second pump body 10 to operate for 30 seconds to discharge supernatant, manual participation is not needed, and the automation degree is high. The liquid caustic soda jar 1 is arranged above the reaction jar 2 through the placing rack, and the valve 11 is fixedly arranged between the liquid caustic soda jar 1 and the reaction jar 2 through screws. Like this with liquid caustic soda jar 1 setting in retort 2 top, when needs liquid caustic soda, only need open valve 11, when not needing liquid caustic soda, also only need close valve 11, utilize the action of gravity to add liquid caustic soda, convenient and fast.

In the scheme, the method comprises the following steps: on one hand, calcium hydroxide is firstly added into the formaldehyde aqueous solution (namely the wastewater containing formaldehyde), then liquid alkali is gradually added into the formaldehyde aqueous solution, the pH value of the formaldehyde aqueous solution is adjusted to 11-12 by the liquid alkali, meanwhile, the formaldehyde aqueous solution is heated to gradually raise the temperature to 70 ℃, the temperature is kept for 2 hours, a supernatant is taken for analysis after standing for 1 hour, and if the formaldehyde content of the supernatant is less than 50ppm, the supernatant can be discharged. On the other hand, in the formaldehyde reaction process, the stirrer 5 is continuously stirred, so that the mixing is more uniform, the heating and the reaction are more uniform, the reaction speed is improved, the effective exertion of the calcium hydroxide catalysis effect is promoted, and the treatment efficiency is improved; meanwhile, the stirrer 5 is controlled by the motor 6 to rotate, and the running state of the motor 6 is controlled by the controller 7, so that stirring is more regular and controllable, the stirring quality is improved, the formaldehyde can be reacted efficiently, the automation degree is high, and the flowing water treatment is facilitated.

Example 2

Only different from embodiment 1 is that inlet tube 3 with all be equipped with the filter screen through welded fastening in the outlet pipe 4, the impurity in the formalin can be filtered to the filter screen that sets up in inlet tube 3, and the impurity in the supernatant can be filtered to the filter screen that sets up in outlet pipe 4, prevents that inlet tube 3 and outlet pipe 4 from blockking up. The outside of retort 2 is equipped with strengthening rib 12 through welded fastening to increase retort 2's structural strength, improve the reliability of work. The bottom of the heater is fixedly provided with a support 13 through welding, so that the heater is prevented from being wetted by being contacted with the ground, and the service life of the heater is prolonged. Handles 14 are fixedly arranged on two sides of the bottom of the heater through welding, so that the heater can be conveniently carried, and the position can be moved according to actual needs.

The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art, and it will be appreciated by those skilled in the art that the present invention has been made available to those skilled in the art after the filing date or priority date, and that the present invention may be implemented by those skilled in the art by applying ordinary skill in the art, without departing from the spirit and scope of the present invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. A reaction system for reducing the formaldehyde content of an aqueous solution comprising: the liquid caustic soda tank is connected with a reaction tank, the reaction tank is connected with a water inlet pipe and a water outlet pipe, and a heater is arranged outside the reaction tank;

the reactor is characterized in that a stirrer is arranged inside the reaction tank, the stirrer is connected with a motor, the motor is connected with a controller, the motor is used for driving the stirrer to rotate, and the controller is used for controlling the running state of the motor.

2. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 1, wherein a flow meter is arranged on the water inlet pipe, and the flow meter is in signal connection with the controller; when the flow is not zero, the controller controls the motor to start, and when the flow is zero, the controller controls the motor to stop.

3. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 2, wherein the water inlet pipe is connected with a first pump body, the water outlet pipe is connected with a second pump body, and the second pump body is in signal connection with the controller; and after the controller controls the motor to stop for a first time, the controller controls the second pump body to operate for a second time.

4. The reaction system for reducing formaldehyde content in an aqueous solution according to any one of claims 1 to 3, wherein the liquid caustic soda tank is arranged above the reaction tank, and a valve is arranged between the liquid caustic soda tank and the reaction tank.

5. The reaction system for reducing the formaldehyde content of an aqueous solution according to any one of claims 1 to 3, wherein a filter screen is arranged in each of the water inlet pipe and the water outlet pipe.

6. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 4, wherein the reaction tank is externally provided with reinforcing ribs.

7. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 6, wherein a support is arranged at the bottom of the heater.

8. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 7, wherein handles are arranged on two sides of the bottom of the heater.

9. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 3, wherein the reaction tank has an oval shape and the heater has a U-shape.

10. The reaction system for reducing the formaldehyde content of an aqueous solution according to claim 2, wherein the inner wall surface of the reaction tank is provided with a scale.