Fenton-like wastewater disinfection device

Abstract

The utility model discloses a Fenton-like wastewater disinfection device. A glass cover made of a light-transmitting material is arranged at the top of a reaction tank; the light source is used for irradiating the interior of the reaction tank; the aeration coil pipe with an air outlet hole is arranged at the bottom of the reaction tank; the Fenton particles are conveyed into the reaction tank through the feeding mechanism and are used for reducing dissolved oxygen to generate hydrogen peroxide; the Fenton particles are more convenient to transport and store compared with hydrogen peroxide, the Fenton particles are added into the reaction tank, magnesium or aluminum in the Fenton particles corrodes and drives dissolved oxygen to be reduced to generate hydrogen peroxide, the hydrogen peroxide, ferroferric oxide and sunlight form a spontaneous sunlight Fenton-like process, and pathogenic microorganisms in the aquaculture wastewater are efficiently inactivated.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, concretely is a kind of fenton-like wastewater disinfection device. BACKGROUND

[0002] A large amount of wastewater is generated in aquaculture process, which seriously restricts the development of aquaculture industry. The wastewater often contains a large amount of pathogenic microorganisms, such as bacteria, viruses and fungi, etc. They not only cause infection risk to fish and shrimp in aquaculture, but also may enter natural water bodies through discharge, affecting the balance of the surrounding ecosystem.

[0003] In the Fenton system composed of hydrogen peroxide and iron ions, iron ions can catalyze the cleavage of hydrogen peroxide to generate hydroxyl radicals (·OH, oxidation potential ~ 2.8V) and other active oxygen clusters (ROS). Active oxygen clusters with extremely high oxidation potential can degrade pollutants and inactivate microorganisms without selection.

[0004] For example, patent announcement No. CN206720827U, a fenton-like oxidation filter for degrading industrial wastewater, adds hydrogen peroxide to the reaction zone through a hydrogen peroxide dosing pipeline. Under the synergistic action of the coconut shell granular activated carbon catalytic layer and the ultrasonic probe, hydroxyl radicals ·OH are generated, and chemical oxidation reaction occurs. The refractory organic matter in water is decomposed, and the sewage is thus purified.

[0005] However, the Fenton process consumes a large amount of hydrogen peroxide, and hydrogen peroxide is difficult to transport and store due to its strong oxidizing property, which poses a safety risk during transportation and storage. Therefore, a fenton-like wastewater disinfection device that does not require direct use of hydrogen peroxide is needed. UTILITY MODEL CONTENT

[0006] The utility model aims to provide a fenton-like wastewater disinfection device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A fenton-like wastewater disinfection device, comprising:

[0009] A reaction tank with a wastewater inlet, the top of the reaction tank is provided with a light-transmitting glass cover;

[0010] A light source for illuminating the inside of the reaction tank;

[0011] An aeration coil with gas outlets is arranged at the bottom of the inner cavity of the reaction tank;

[0012] A feeding mechanism for conveying Fenton particles into the reaction tank;

[0013] The feeding mechanism comprises a lifting mechanism, a screw conveyor and an elastic conveying pipe installed at the output end of the screw conveyor, the elastic conveying pipe is matched with the profile of the aeration coil, discharge holes corresponding to the gas outlet holes are formed in the bottom of the elastic conveying pipe, and the output end of the lifting mechanism is connected with the end of the elastic conveying pipe.

[0014] Preferably, the glass cover is made of high borosilicate glass with a thickness of 1mm-3mm.

[0015] Preferably, the light source is sunlight or simulated sunlight.

[0016] Preferably, the reaction tank is provided with a support at the bottom.

[0017] Preferably, the aeration coil is arranged in a serpentine shape, the aeration coil occupies 50%-80% of the bottom area of the reaction tank, and the spacing between the gas outlet holes on the aeration coil is 1cm-2cm.

[0018] Preferably, the reaction tank is a circular barrel structure with a height-diameter ratio of 1-2.

[0019] Preferably, the glass cover is installed on the top of the reaction tank through a flange.

[0020] Preferably, the gas flow rate of the aeration coil is 30L / min-100L / min, and the dosage of the Fenton particles in the wastewater is 2g / L-10g / L.

[0021] Preferably, the Fenton particles are mixed components prepared after ball milling of magnesium, carbon and magnetite.

[0022] The Fenton particles are mixed components prepared after ball milling of aluminum, carbon and magnetite.

[0023] Preferably, the light source is an LED lamp, and a plurality of LED lamps are vertically arranged and inserted into the reaction tank.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The Fenton particles are more convenient to transport and store than hydrogen peroxide, by adding the Fenton particles in the reaction tank, magnesium or aluminum in the Fenton particles is corroded to drive dissolved oxygen to reduce hydrogen peroxide, which, together with magnetite and sunlight, forms a spontaneous sunlight-like Fenton process, and pathogenic microorganisms in aquaculture wastewater are inactivated efficiently.

[0026] The utility model has the characteristics of simple use, convenient operation, low cost, complete disinfection and no secondary pollution.

[0027] The sunlight is also used to promote the iron cycle, thereby greatly improving the disinfection efficiency, shortening the disinfection time and improving the applicability of the device. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is a schematic diagram of the first part of the feeding mechanism of this utility model.

[0031] Figure 3 This is a schematic diagram of the second part of the feeding mechanism of this utility model.

[0032] 1. Air pump; 2. Gas flow meter; 3. Aeration coil; 4. Glass cover; 5. Air outlet; 6. Wastewater vent valve; 7. Support frame; 8. Flange; 9. Sewage pump; 10. Fenton granules; 11. Feeding box; 12. Screw conveyor; 13. Flexible conveying pipe; 14. Lifting mechanism. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1: As Figure 1 As shown:

[0035] The reaction tank has a cylindrical structure with a height-to-diameter ratio between 1 and 2. Wastewater to be treated (such as aquaculture wastewater) and Fenton granules 10 are added to the tank. A triangular support 7 is installed at the bottom of the reaction tank. The side wall of the reaction tank is equipped with a wastewater inlet, an aeration inlet, and an outlet 5. The wastewater inlet and aeration inlet are higher than the outlet 5 to prevent wastewater backflow, and the outlet also serves as an overflow outlet. A wastewater vent valve 6 is installed on the bottom wall of the reaction tank. The wastewater inlet is connected to a sewage pump 9 via an inlet pipe to transport external wastewater into the reaction tank.

[0036] The Fenton particles 10 can be prepared by ball milling of magnesium, coconut shell carbon and ferroferric oxide. Magnesium and coconut shell carbon can easily form a primary cell in an aqueous solution. Magnesium is corroded as an anode. The electrons on the surface of the coconut shell carbon are reduced by dissolved oxygen through a two-electron pathway to produce hydrogen peroxide. The ferroferric oxide loaded on the surface of the coconut shell carbon catalyzes the production of hydroxyl radicals and active oxygen clusters such as superoxide anions, which effectively degrade organic pollutants in aquaculture wastewater. Alternatively, the Fenton particles 10 are prepared by ball milling of zero-valent aluminum, biochar (bamboo powder carbon) and ferroferric oxide.

[0037] A glass cover 4 is installed on the top of the reaction tank. The glass cover 4 is made of high borosilicate glass with a thickness of 1mm-3mm. The high borosilicate glass can transmit ultraviolet light in sunlight, which accounts for about 4% of sunlight, and has a high photo-Fenton effect. The glass cover 4 is sealed using a flange 8.

[0038] A serpentine / whirlpool-shaped aeration coil 3 is placed on the inner bottom wall of the reaction tank. The aeration coil 3 occupies 50%-80% of the bottom area of the reaction tank. If the area ratio of the aeration coil 3 is too small, it is not conducive to the fluidization of the Fenton particles. If the area ratio of the aeration coil 3 is too large, it increases energy consumption. The air outlets on the aeration coil 3 are arranged at equal intervals along the length of the aeration coil 3, and the air outlet spacing is 1cm. The aeration amount is 30 L / min. An external air pump 1 is connected to the aeration coil 3 through an air pipe and an aeration air inlet. A gas flow meter 2 is installed on the air pipe. The aeration coil 3 can aerate air or oxygen.

[0039] The light source can be sunlight or simulated sunlight. The light source is located above the glass cover 4. Sunlight can promote the regeneration of low-valence iron ions in the Fenton / Fenton-like process. Alternatively, the light source can be multiple LED lights. The multiple LED lights are vertically arranged and inserted into the inner side wall of the reaction tank.

[0040] The feeding mechanism can be manually operated by hand. As shown in Figure 2 , the feeding mechanism includes a feeding box 11 and a screw conveyor 12. The feeding box 11 is used to store Fenton particles 10. The screw conveyor 12 accurately delivers the required amount of Fenton particles 10 from the feeding box 11 into the reaction tank.

[0041] The feeding mechanism also includes a lifting mechanism 14. The lifting mechanism 14 can be an electric telescopic rod and is vertically arranged. The first end of an elastic conveying pipe 13 is connected to the output end of the screw conveyor 12. The end of the elastic conveying pipe 13 is closed. The end of the elastic conveying pipe 13 is connected to the output end of the lifting mechanism 14. The elastic conveying pipe 13 is compatible with the profile of the aeration coil 3. The bottom of the elastic conveying pipe 13 is provided with discharge holes 131 corresponding to the air outlets. The elastic conveying pipe 13 is made of elastic material and has a certain deformation capacity.

[0042] Working principle of the feeding mechanism:

[0043] Spiral conveyor 12 transports Fenton particles 10 into flexible conveying pipe 13, at this time, the horizontal height of the head end of flexible conveying pipe 13 is higher than the horizontal height of the tail end of flexible conveying pipe 13, and Fenton particles 10 move from the head end of flexible conveying pipe 13 to the tail end of flexible conveying pipe 13 under the action of gravity;

[0044] Lifting mechanism 14 drives the tail end of flexible conveying pipe 13 to rise, at this time, the horizontal height of the head end of flexible conveying pipe 13 is lower than the horizontal height of the tail end of flexible conveying pipe 13, and Fenton particles 10 accumulated at the tail end of flexible conveying pipe 13 move from the tail end of flexible conveying pipe 13 to the head end of flexible conveying pipe 13 under the action of gravity;

[0045] The above steps are repeated, and Fenton particles 10 repeatedly move between the head end and the tail end of flexible conveying pipe 13, and Fenton particles 10 in flexible conveying pipe 13 drop out through the bottom discharge hole 131 in the process, and the dropped Fenton particles 10 fall roughly on the aeration position of the air outlet hole of aeration coil 3, which is beneficial to uniformly feeding Fenton particles 10 to the aeration position of the reaction tank.

[0046] Fenton particles 10 with a dosage of 2 g / L are located in wastewater, and are fluidized by bubbles from aeration coil 3, which increases the dissolved oxygen of water body, improves the performance of aluminum / magnesium corrosion-driven dissolved oxygen reduction to produce H2O2, promotes the absorption of Fenton particles 10 to sunlight, and improves the Fenton-like efficiency; detection shows that the device can generate high-concentration hydrogen peroxide in situ, and the Fenton-like reaction is realized by the combination of the generated hydrogen peroxide and the magnetite loaded on the surface of carbon material, thereby achieving complete disinfection of aquaculture wastewater.

[0047] Turn on the aeration switch of air pump 1, and aerate for 30 minutes; pour Fenton particles 10 with a dosage of 2 g / L into water, connect the top glass cover 4 with flange 8, and continue to aerate the aquaculture wastewater by turning on air pump 1.

[0048] After the simulated sewage is treated by the device for 1.5 hours, the initial concentration of E. coli is reduced by 4.6 orders of magnitude. 6 CFU / mL.

[0049] Example Two: contains all the contents of Example One, except that:

[0050] The dosage of Fenton particles 10 is 5 g / L, and the aeration amount is 50 L / min.

[0051] After the simulated sewage is treated by the device for 1.5 hours, the initial concentration of E. coli is reduced by 5.4 orders of magnitude. 6 CFU / mL.

[0052] Example Three: contains all the contents of Example One, except that:

[0053] The Fenton granules 10 were dosed at 8 g / L and the aeration rate was 60 L / min.

[0054] After 0.5 hours of treatment of the simulated wastewater by the device, the initial concentration of 1 x 10 6 The E. coli was reduced by 5.4 orders of magnitude.

[0055] Example Four: includes all the content of Example One, except that:

[0056] The air hole spacing on the aeration disc tube 3 was 2 cm.

[0057] After 1.5 hours of treatment of the simulated wastewater by the device, the initial concentration of 1 x 10 6 The E. coli was reduced by 4.1 orders of magnitude.

[0058] Example Five: includes all the content of Example One, except that:

[0059] The Fenton granules 10 were dosed at 10 g / L and the aeration rate was 60 L / min.

[0060] After 0.5 hours of treatment of the simulated wastewater by the device, the initial concentration of 1 x 10 6 The E. coli was reduced by 5.6 orders of magnitude.

[0061] Example Six: includes all the content of Example One, except that:

[0062] The Fenton granules 10 were dosed at 8 g / L and the aeration rate was 100 L / min.

[0063] After 0.5 hours of treatment of the simulated wastewater by the device, the initial concentration of 1 x 10 6 The E. coli was reduced by 5.6 orders of magnitude.

[0064] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A Fenton-like wastewater disinfection device, characterized in that, The utility model relates to a Fenton reaction device for treating wastewater, comprising: a reaction tank with a wastewater inlet, the top of which is provided with a light-permeable glass cover (4); a light source for illuminating the inside of the reaction tank; an aeration coil (3) connected with an external air pump (1) through an air pipe and an aeration inlet hole, the inner bottom wall of the reaction tank cavity is provided with a serpentine-shaped / a vortex-shaped aeration coil (3), and the air outlet holes on the aeration coil (3) are arranged at equal intervals along the length of the aeration coil (3); a feeding mechanism for feeding Fenton particles (10) into the reaction tank, which comprises a lifting mechanism (14), a screw conveyor (12), and an elastic conveying pipe (13) installed at the output end of the screw conveyor (12), the elastic conveying pipe (13) is matched with the profile of the aeration coil (3), the bottom of the elastic conveying pipe (13) is provided with discharge holes corresponding to the air outlet holes one by one, and the output end of the lifting mechanism (14) is connected with the end of the elastic conveying pipe (13).

2. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The glass cover (4) is made of high borosilicate glass with a thickness of 1mm-3mm.

3. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The light source is sunlight or simulated sunlight.

4. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The reaction tank is provided with a support (7) at the bottom.

5. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The aeration coil (3) occupies 50%-80% of the bottom area of the reaction tank, and the air outlet holes on the aeration coil (3) are arranged at a distance of 1cm-2cm.

6. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The reaction tank has a circular barrel structure with a height-diameter ratio of 1-2.

7. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The glass cover (4) is installed on the top of the reaction tank through a flange (8).

8. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The gas flow rate delivered by the aeration coil (3) is 30L / min-100L / min.

9. A Fenton-like wastewater disinfection device according to claim 1, characterized in that: The light source uses LED lamps, and multiple LED lamps are vertically arranged and inserted into the reaction tank.

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