Microelectrolysis pretreatment device for bamboo waste water

Abstract

The utility model discloses a microelectrolysis pretreatment device for bamboo waste water, which comprises a bottom plate, a treatment box is mounted on the bottom plate, a water inlet is arranged on the left side of the lower end of the treatment box, a water outlet is arranged on the right side of the upper end of the treatment box, and a plurality of fan-shaped filler screen frames with the same size are further arranged in the treatment box. The filler screen frames form a stirring area in the middle of the treatment box, a spacing area is further formed between every two adjacent filler screen frames, and each filler screen frame is further internally provided with a circular micro-electrolysis filler. Due to the arrangement of the four high-voltage electrodes in the device, the intensity distribution of a target electric field is more uniform, the effective action area is larger, and the action effect on water treatment is better; and the aeration cylinder is correspondingly arranged, air flow can be added into the micro-electrolysis filler for aeration, the micro-electrolysis performance is effectively improved, and the aeration cylinder is correspondingly arranged in the micro-electrolysis filler, so that the water treatment effect is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bamboo wastewater treatment, in particular to a micro-electrolysis pretreatment device for bamboo wastewater. Background Technique

[0002] Most of the production processes of bamboo pulp mills in China adopt the chemical method. During the production process, the wastewater generated is large in quantity, high in concentration and high in chromaticity. Bamboo pulp wastewater contains a large amount of organic substances such as sugars, organic acids, amino acids, flavonoids, tannic acid, etc., which increases the difficulty of wastewater treatment. The pulping black liquor in the wastewater is the main source of pollutants. With the gradual improvement of the alkali recovery technology, chemical bamboo pulp mills all adopt evaporation concentration and combustion to treat the organic substances in the black liquor and recover inorganic alkali. The middle-stage water composed of bamboo washing water, bleaching water, sewage condensate water and workshop flushing water becomes the source of wastewater, and the pollutants are greatly reduced.

[0003] The micro-electrolysis technology, also known as the internal electrolysis method, has attracted wide attention with its characteristics of simple operation and no secondary pollution, and is applied to difficult-to-treat wastewater.

[0004] Its basic principle is to place two metals with a potential difference or a conductive metal and other conductive non-metallic substances in a conductive electrolyte solution. Countless primary battery reactions are quickly generated in the system. The newly generated metal cations and atomic H, etc. generated by the electrode reaction have high chemical activity and can react with many components in the wastewater. However, the micro-electrolysis usually has problems such as low reaction rate and easy caking. Therefore, how to improve the performance of micro-electrolysis is a technical problem that needs to be solved in the existing technology.

[0005] Therefore, in order to solve the above problems, it is necessary to develop a micro-electrolysis pretreatment device for bamboo wastewater with a reasonable structure and capable of effectively improving the performance of micro-electrolysis. Content of the Utility Model

[0006] The purpose of the utility model is to provide a micro-electrolysis pretreatment device for bamboo wastewater aiming at the deficiencies existing in the prior art; its technical solution is as follows:

[0007] A micro-electrolysis pretreatment device for bamboo wastewater includes a bottom plate, on which a treatment tank is installed. An inlet is arranged on the left side of the lower end of the treatment tank, and an outlet is arranged on the right side of the upper end. A plurality of filler mesh frames with the same size and in a fan-shaped structure are also arranged in the treatment tank. The filler mesh frames form a stirring area at the middle position of the treatment tank, and an interval area is formed between adjacent filler mesh frames. A circular micro-electrolysis filler is arranged in each filler mesh frame.

[0008] A stirring motor is also installed at the upper end of the treatment tank. The main shaft of the stirring motor extends downward into the stirring area, and stirring rods are evenly spaced up and down on the main shaft. In the spaced areas formed between adjacent packing mesh frames, rod-shaped high-voltage electrodes are correspondingly installed, and the high-voltage electrodes are fixedly arranged on the bottom plate.

[0009] Further, a total of four packing mesh frames are provided, and correspondingly four spaced areas are also provided. One high-voltage electrode is correspondingly installed in each spaced area, and the four high-voltage electrodes are located on the same circumference.

[0010] Further, a power supply device is also included. The power supply device is arranged outside the bottom plate, and wires are arranged inside the bottom plate to connect to the high-voltage electrodes inside the treatment tank.

[0011] Further, four aeration cylinders are also installed on the bottom plate. The four aeration cylinders are respectively arranged in the four packing mesh frames, and the installation positions of the four aeration cylinders correspond to the installation positions of the four high-voltage electrodes. The aeration cylinders and the high-voltage electrodes are located on the same circumference.

[0012] Further, the height of the aeration cylinder is set to be half of the treatment tank. The upper end of each aeration cylinder is closed, and evenly distributed air holes are arranged on the cylinder wall of each aeration cylinder.

[0013] Further, an aerator is also arranged outside the bottom plate. Corresponding aeration pipes communicating with the aeration cylinders are arranged inside the bottom plate, and the aeration pipes are externally connected to the aerator, so that external air can be correspondingly sent into the treatment tank through the aerator.

[0014] Beneficial effects: The utility model has the following beneficial effects:

[0015] 1) The arrangement of the four high-voltage electrodes in this device makes the distribution of the target electric field intensity more uniform, the effective action area larger, and the effect on water treatment better. Moreover, aeration cylinders are correspondingly arranged, and air flow can be added to the treatment tank for aeration, effectively improving the micro-electrolysis performance. And the aeration cylinders are correspondingly arranged inside the micro-electrolysis filler, effectively improving the water treatment effect.

[0016] 2) The packing mesh frames for storing and placing the micro-electrolysis filler in this device are set as a fan-shaped structure, so that the total cross-sectional area can reach 75.06%. The cross-sectional areas of the cylindrical structure and the square module respectively account for 49.94% and 48.34% of the total cross-sectional area. The space utilization rate of this device has obvious advantages.

[0017] 3) In this device, the design of the packing mesh frames is also used to form a stirring area and evenly spaced intervals. The stirring shaft is correspondingly installed through the stirring area, and the high-voltage electrodes are correspondingly installed through the spaced intervals. The space utilization rate is high and the structure is reasonable.

[0018] 4) The addition of the electric field in this device only utilizes the action of its electrostatic force, does not form an electric current in the wastewater, has low energy consumption, does not consume the materials of the cathode or anode, and has low maintenance costs. Description of the Drawings

[0019] Figure 1 It is a structural diagram of the present utility model;

[0020] Figure 2 It is an internal cross-sectional view of the present utility model;

[0021] Figure 3 It is Figure 2 the A-A cross-sectional view in

[0022] Figure 4 It is Figure 3 the B-B cross-sectional view in

[0023] Figure 5 It is the distribution diagram of the wastewater flow velocity without setting stirring;

[0024] Figure 6 It is the distribution diagram of the wastewater flow velocity after setting stirring;

[0025] Figure 7 It is the distribution diagram of the electric field with two high-voltage electrodes set;

[0026] Figure 8 It is the distribution diagram of the electric field with three high-voltage electrodes set;

[0027] Figure 9 It is the distribution diagram of the electric field with four high-voltage electrodes set;

[0028] Figure 10 It is the distribution diagram of the electric field with five high-voltage electrodes set. Detailed Embodiment

[0029] Next, in combination with the drawings and specific embodiments, the present utility model will be further clarified. These embodiments are implemented on the premise of the technical solution of the present utility model. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0030] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, a micro-electrolysis pretreatment device for bamboo wastewater includes a bottom plate 1, on which a treatment tank 2 is installed. An inlet 3 is arranged on the left side of the lower end of the treatment tank 2, and an outlet 4 is arranged on the right side of the upper end. A number of filler mesh frames 5 with the same size and in a fan-shaped structure are also arranged in the treatment tank 2. The filler mesh frames 5 form a stirring area 6 at the middle position of the treatment tank 2, and an interval area 7 is also formed between adjacent filler mesh frames 5. A circular micro-electrolysis filler 8 is arranged in each filler mesh frame 5;

[0031] A stirring motor 9 is also installed at the upper end of the treatment tank 2. The main shaft 10 of the stirring motor 9 extends downward into the stirring area 6, and stirring rods 11 are evenly spaced up and down on the main shaft 10. In the interval area 7 formed between adjacent packing mesh frames 5, rod-shaped high-voltage electrodes 12 are correspondingly installed, and the high-voltage electrodes 12 are fixedly arranged on the bottom plate 1.

[0032] There are four packing mesh frames 5 in total, and there are also four corresponding interval areas 7. One high-voltage electrode 12 is correspondingly installed in each interval area 7, and the four high-voltage electrodes 12 are located on the same circumference.

[0033] It further includes a power supply device 13, which is arranged outside the bottom plate 1. A wire 14 is arranged inside the bottom plate 1 and is connected to the high-voltage electrode 12 inside the treatment tank 2.

[0034] Four aeration cylinders 15 are also installed on the bottom plate 1. The four aeration cylinders 15 are respectively arranged in the four packing mesh frames 5, and the installation positions of the four aeration cylinders 15 correspond to the installation positions of the four high-voltage electrodes 12. The aeration cylinders 15 and the high-voltage electrodes 12 are located on the same circumference.

[0035] The height of the aeration cylinder 15 is set to be half of that of the treatment tank 2. The upper end of each aeration cylinder 15 is closed, and uniformly distributed air holes 16 are arranged on the cylinder wall of each aeration cylinder 15.

[0036] An aerator 17 is also arranged outside the bottom plate 1. A corresponding aeration pipe 18 communicated with the aeration cylinder 15 is arranged inside the bottom plate 1. The aeration pipe 18 is externally connected to the aerator 17, and external air can be correspondingly sent into the treatment tank 2 through the aerator 17.

[0037] In order to achieve a good mixing effect between the micro-electrolysis filler and the wastewater, a stirring mechanism composed of a stirring motor, a stirring shaft and stirring rods is arranged at the middle position of this device, and from Figure 5 And Figure 6 By comparison, it can be known that the flow rate of the wastewater without stirring is mainly distributed below 6.25×10 -3 The overall flow rate of the equipment is slow, and the micro-electrolysis reaction with the wastewater is difficult to proceed fully. After adding the stirring paddle, the flow rate at the bottom of the equipment is mainly distributed between 0.2 and 0.6 m / s, which can fully mix the influent water and distribute it among the micro-electrolysis fillers. The relative flow rate at the top of the equipment is relatively slow, but the flow rate of most of the liquid is still above 0.1 m / s, maintaining the flow of the liquid and meeting the requirements of the micro-electrolysis process.

[0038] Figure 9 This is the distribution diagram of the electric field after setting four high-voltage electrodes for this device, and Figure 7 This is the distribution diagram of the electric field after setting two high-voltage electrodes.Figure 8 The electric field distribution diagram after setting three high-voltage electrodes Figure 10 The electric field distribution diagram after setting five high-voltage electrodes

[0039] It can be seen that setting four high-voltage electrodes in this device can best meet the requirement of uniform electric field distribution. The experimental results show that the micro-electrolysis effect is the best when the electric field strength is 1 kV / cm. Therefore, taking 1 kV as the target electric field strength, from Figure 10 By comparison, when the number of electrodes is four or more, the device can basically meet the design requirement of an electric field strength of 1 kV / cm. In order to reduce the equipment cost, it is most appropriate to use four high-voltage electrodes

[0040] In this device, the micro-electrolysis filler is specifically placed in the filler mesh frame, and the filler mesh frame is set in a fan shape. The design of this fan-shaped mesh frame has many advantages. First, it can form a stirring area in the middle position for installing the stirring shaft correspondingly; second, it can form an interval area between adjacent filler mesh frames for installing high-voltage electrodes; third, compared with other circular frames or cylindrical frames, etc., it can store and place the micro-electrolysis filler to the greatest extent when installing the stirring mechanism and high-voltage electrodes correspondingly, and has a larger cross-sectional perimeter, which means it has a larger surface area for the wastewater to flow through. These advantages mainly come from the design of the filler mesh frame, which can provide more space for stacking fillers around the electrodes, making the reaction proceed faster

[0041] In addition, an aeration cylinder is also set in the treatment tank of this device. The aeration cylinder is set in the fan-shaped filler mesh frame and is in direct contact with the internal micro-electrolysis filler. During the specific water treatment process, air can be introduced into the treatment tank through an external aerator. On the one hand, it can stir the wastewater; on the other hand, it can directly aerate the micro-electrolysis filler, making the decomposition of metal cations and atomic H inside it faster, improving the activity, and enhancing the wastewater treatment effect

[0042] Example 1

[0043] In this example, the parameters of each component are specifically set. The temperature of the wastewater inside the treatment tank is specifically set at -5°C to 60°C, and the treatment tank is suitable for the welding manufacturing process. And PVC-U (rigid polyvinyl chloride) is used as the main material of this device. The specific size is 1.7 m in diameter and 1.5 m in height, and the effective volume V = 3.4 m 3 , the wastewater filling rate is calculated at 80%, and the hourly water inflow Q = 2.7 m 3 , the diameter of the water inlet D = 200 mm, and the water inlet flow velocity v = 7.4×10 -3 m / s

[0044] A flat blade paddle type stirring mechanism is arranged in the middle to ensure the flow of wastewater in the pretreatment device. Four high-voltage electrodes are arranged in an annular array in the device. The surface potential of the electrode is 50 kV, and the inner and outer surface potentials are 0 kV. Micro-electrolysis fillers are placed in the filler frame. The specific surface area of the micro-electrolysis material used is 1.2 m 2 / g, the bulk density is 1200 g / L, and the iron-carbon ratio is 1:4.

[0045] The wastewater in this embodiment comes from high-yield bamboo pulp making. The bamboo raw material is Neosinocalamus affinis from Sichuan. In the pulp making process, the dosage of sodium hydroxide is 60 kg / (t·pulp), the dosage of hydrogen peroxide is 60 kg / (t·pulp), the dosage of sodium silicate is 15 kg / (t·pulp), and the dosage of DTPA (diethylenetriaminepentaacetic acid) is 5 kg / (t·pulp). The wastewater discharged during the pulp making process is collected, and micro-electrolysis pretreatment and electro-field assisted micro-electrolysis pretreatment experiments are carried out on the bamboo wastewater. Then it is introduced into the biochemical reaction experimental device, and the biochemical effects of different treatment processes are listed in Table 1 below.

[0046] Table 1: Comparison of biochemical effects of eucalyptus high-yield pulp wastewater under different processes

[0047]

[0048] As can be seen from Table 1, compared with the raw water, the COD of the wastewater after micro-electrolysis treatment is 3058 mg / L at the anaerobic section effluent, a decrease of 16.2%; the COD of the wastewater after electro-field assisted micro-electrolysis treatment is 2369 mg / L at the anaerobic section effluent, a decrease of 35.1%. The COD of the wastewater after micro-electrolysis treatment is 1720 mg / L at the aerobic section effluent, a decrease of 14.6%; the COD of the wastewater after electro-field assisted micro-electrolysis treatment is 1393 mg / L at the aerobic section effluent, a decrease of 30.7%. From the perspective of treatment efficiency, the two pretreatment methods have little effect on the treatment efficiency of the aerobic section, but significantly improve the treatment efficiency of the anaerobic section. Compared with the raw water, the anaerobic treatment efficiency of the wastewater after micro-electrolysis treatment is increased by 7.4%; the anaerobic treatment efficiency of the wastewater after electro-field assisted micro-electrolysis treatment is increased by 14.5%.

[0049] The above specific implementation manners are only a preferred embodiment of the present invention, and are not used to limit the implementation and the scope of the claims of the present invention. Any equivalent changes and modifications made according to the content of the patent protection scope of the present invention shall be included in the scope of the patent application of the present invention.

Claims

1. A micro-electrolysis pretreatment device for bamboo wastewater, characterized in that: The invention comprises a bottom plate (1), on which a treatment box (2) is mounted, a water inlet (3) is arranged on the left side of the lower end of the treatment box (2), and a water outlet (4) is arranged on the right side of the upper end, and a plurality of filler mesh frames (5) of the same size and in a fan-shaped structure are also arranged in the treatment box (2), the filler mesh frames (5) form a stirring area (6) at the middle position of the treatment box (2), and a spacing area (7) is formed between adjacent filler mesh frames (5), and each filler mesh frame (5) is also provided with a circular micro-electrolysis filler (8); A stirring motor (9) is also installed at the upper end of the processing box (2), and the main shaft (10) of the stirring motor (9) extends downward into the stirring area (6), and a stirring rod (11) is installed on the main shaft (10) with uniform upper and lower spacing; and a rod-shaped high-voltage electrode (12) is correspondingly installed in the spacing area (7) formed between adjacent filler mesh frames (5), and the high-voltage electrode (12) is correspondingly fixed on the bottom plate (1).

2. A micro-electrolysis pretreatment device for bamboo wastewater according to claim 1, characterized in that: There are four filler mesh frames (5) in total, and four corresponding spacing areas (7) are also provided. A high-voltage electrode (12) is correspondingly installed in each spacing area (7), and the four high-voltage electrodes (12) are located on the same circumference.

3. A micro-electrolysis pretreatment device for bamboo wastewater according to claim 2, characterized in that: It also includes a power supply device (13), which is arranged on the outside of the bottom plate (1). A wire (14) is arranged inside the bottom plate (1) and is connected to the high-voltage electrode (12) inside the processing box (2).

4. A micro-electrolysis pretreatment device for bamboo wastewater according to claim 2, characterized in that: Four aeration cylinders (15) are also installed on the base plate (1). The four aeration cylinders (15) are respectively arranged in four filler mesh frames (5). The arrangement positions of the four aeration cylinders (15) correspond to the arrangement positions of the four high-voltage electrodes (12). The aeration cylinders (15) and the high-voltage electrodes (12) are located on the same circumference.

5. A micro-electrolysis pretreatment device for bamboo wastewater according to claim 4, characterized in that: The height of the aeration cylinder (15) is set to be half of the height of the treatment box (2), the upper end of each aeration cylinder (15) is closed, and the cylinder wall of each aeration cylinder (15) is provided with evenly distributed aeration holes (16).

6. A micro-electrolysis pretreatment device for bamboo wastewater according to claim 5, characterized in that: An aerator (17) is also arranged on the outside of the bottom plate (1), and an aeration pipe (18) correspondingly connected to the aeration cylinder (15) is correspondingly arranged inside the bottom plate (1). The aeration pipe (18) is externally connected to the aerator (17), and external air can be correspondingly sent into the treatment box (2) through the aerator (17).

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