CN211813791U - A photocatalytic treatment device for organic wastewater - Google Patents

Abstract

The utility model discloses an organic wastewater photocatalysis treatment device, which comprises a filtering system, wherein the filtering system is communicated with a sewage treatment tank; the input end of the photocatalytic reaction system is connected with the output end of the filtering system, and a lamp source is arranged in the photocatalytic reaction system; the aeration system is communicated with the photocatalytic reaction system; and a circulation line; and the operation power of the filtering system, the photocatalytic reaction system, the aeration system and the circulating pipeline is provided by a motor. The utility model discloses an organic waste water photocatalysis processing apparatus can reduce 75% with the organic pollutant in the beer waste water, makes its play water reach the one-level A standard among the pollutant discharge standard of town sewage treatment plant.

Description

A photocatalytic treatment device for organic wastewater

technical field

The utility model relates to the technical field of sewage treatment, in particular to a photocatalytic treatment device for organic waste water.

Background technique

China is a big country of beer consumption. With the improvement of living standards, more and more people use home-brewed beer machines, but the wastewater produced by brewing has not been properly treated. Beer production wastewater is medium and high concentration produced in the beer production process Organic waste water, although this type of waste water is non-toxic, it is very easy to spoil. Once it enters the water body, it will consume a large amount of dissolved oxygen, reduce the dissolved oxygen in the water body, and cause a large number of anaerobic microorganisms to grow, consume organic matter in the water, and produce some toxic substances. , resulting in poor water quality, forming a vicious circle, affecting the normal life of aquatic organisms, and causing serious harm to the surrounding environment.

At present, brewery wastewater is often treated by aerobic or anaerobic methods, but the aerobic method produces a large amount of sludge and the treatment cost is high; the anaerobic method has a long process and a slow reaction speed; and the anaerobic-aerobic combined biological treatment Although the technology has a good removal effect on pollutants, the high cost also limits its application in sewage treatment.

In recent years, photocatalytic oxidation technology has been widely used in advanced treatment of various wastewaters. TiO ₂ can photocatalytically degrade organic pollutants, and can degrade alkenes, hydrocarbons, aldehydes, alcohols, aromatic compounds, organic dyes, pesticides in organic substances. , surfactants, organic acids, toluene and other pollutants, decompose organic pollutants into non-toxic and harmless carbon dioxide and water and other non-toxic and harmless inorganic substances, and achieve good engineering practical results, with high efficiency, technology The advantages of simple equipment and easy control of reaction conditions, etc., but the cost of photocatalytic reactors on the market is high, the operating costs are too high, the active components of catalysts are easy to lose, and they are easy to condense in aqueous solutions, which hinders _TiO2 photocatalytic materials and The popularization and application of the reactor in practice.

Therefore, how to provide a low-cost, high-efficiency photocatalytic treatment device for organic wastewater is an urgent problem for those skilled in the art.

Utility model content

In view of this, the utility model provides a photocatalytic treatment device for organic wastewater, which saves the treatment cost of organic wastewater to a large extent, improves the reaction efficiency, and also realizes the recovery and utilization of the catalyst.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

A device for photocatalytic treatment of organic wastewater, comprising:

a filtration system, the filtration system is communicated with the sewage treatment tank;

a photocatalytic reaction system, the input end of the photocatalytic reaction system is connected with the output end of the filtering system, and a lamp source is installed inside the photocatalytic reaction system;

an aeration system, the aeration system is communicated with the photocatalytic reaction system;

and circulation pipes;

And the operating power of the filtering system, the photocatalytic reaction system, the aeration system and the circulation pipeline is provided by an electric motor.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the filtration system is an activated carbon filtration system, and the filtration system is any one of a fixed bed adsorber, a moving bed adsorber or a fluidized bed adsorber.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the filtration system is a fixed-bed adsorber, and the fixed-bed adsorber is made of plexiglass (PMMA methyl methacrylate) filled with activated carbon balls.

The beneficial effects of the above technical solution are: the fixed bed adsorber is used for the filtration and preliminary pretreatment of wastewater before photocatalysis, and has the characteristics of simple structure, easy manufacture and low price, and the device as a whole is suitable for the treatment of small and intermittent pollution sources, The adsorption and desorption are operated intermittently, and the adsorbent can be recycled;

And activated carbon balls are used for filtration, adsorption, decolorization and deodorization of wastewater before photocatalysis, which effectively reduces the chromaticity of wastewater and the concentration of suspended matter, which is convenient for subsequent treatment;

In addition, the filtration system uses plexiglass as the medium, which has high corrosion resistance and light transmittance, and greatly reduces the operating cost.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, a water volume regulating valve is detachably connected at the bottom of the filtering system.

The beneficial effect of the above technical solution is that the water volume regulating valve can not only be used to control the treatment volume of sewage, but also realize the replacement and recycling of the activated carbon balls filled inside because it is detachable.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the photocatalytic reaction system is composed of a plurality of photocatalytic reactors connected in series.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the interior of the photocatalytic reactor is filled with TiO ₂ /ACF composite material.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the preparation of the TiO ₂ /ACF composite material includes the following steps:

Measure 35ml of anhydrous ethanol solution and 32ml of distilled water in a beaker, add 5 drops of concentrated hydrochloric acid to adjust the pH to 3 or less, denoted as A solution; add 35ml of butyl titanate, 23ml of glacial acetic acid, 70ml of no Water ethanol, denoted as B solution. Put the B solution on a constant temperature stirrer at 30°C for stirring, slowly add the A solution to the B solution, and continue stirring for 100 min after the dropwise addition to form a wet sol. After the wet sol was obtained, 1% of E-15 epoxy resin was added respectively, and the activated carbon fibers were cut and impregnated for two times, then dried in a blast box at 105 °C for 15 min, and finally calcined in a muffle furnace at 450 °C for hr. TiO ₂ /ACF composites with cross-linking agents were obtained.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the lamp source is an ultraviolet lamp.

The beneficial effects of the above technical solutions are: the ultraviolet lamp tube emits ultraviolet light, so that the inner and outer sides of the photocatalytic reactor are uniformly lighted, thereby improving the catalytic efficiency;

And it should be noted that when the TiO ₂ /ACF composite is used, it is only effective under the irradiation of UV lamp, and neither high-pressure mercury lamp nor xenon lamp will improve the catalytic efficiency.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the material of the photocatalytic reactor is quartz glass.

The beneficial effects of the above technical solutions are: by using quartz glass as the optical material, the normal operation of the organic wastewater photocatalytic treatment device under various harsh conditions can be realized, so that the reaction process is more stable.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, a flow meter is provided on one side of the water inlet of the filtration system.

The beneficial effects of the above technical solutions are: the flow meter can facilitate the observation of the flow during the wastewater treatment process, and can be flexibly adjusted according to requirements.

Preferably, in the above-mentioned photocatalytic treatment device for organic wastewater, the electric motor provides power for the operation of the entire device.

It can be seen from the above technical solutions that, compared with the prior art, the present utility model discloses a photocatalytic treatment device for organic wastewater, which is especially suitable for the treatment of laboratory and small-scale organic wastewater. Selection, calculation and practical application of treatment, the removal rate of organic pollutants in brewery wastewater is greater than 75%, so that the effluent reaches COD<50mg/L, and the ideal treatment effect has been achieved, reaching the urban sewage treatment plant pollutant discharge standard. Level 1 A standard.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

Fig. 1 accompanying drawing is the overall structure schematic diagram of the utility model;

Fig. 2 accompanying drawing is the top view of the overall structure of the utility model;

Fig. 3 accompanying drawing is the side view of the overall structure of the present utility model;

Fig. 4 accompanying drawing is the influence curve of the catalyst dosage of the utility model embodiment on the removal efficiency of methyl orange;

Fig. 5 accompanying drawing is the influence curve of the catalyst concentration of the embodiment of the utility model on the removal efficiency of methyl orange;

The accompanying drawing of FIG. 6 is the influence curve of the catalyst shape in the embodiment of the present invention on the removal efficiency of methyl orange.

In the picture:

1 is the activated carbon filter system, 2 is the photocatalytic reactor, 3 is the flow meter, 4 is the ultraviolet lamp, 5 is the motor, and 6 is the sewage treatment tank.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example

The embodiment of the present utility model provides a photocatalytic treatment device for organic wastewater, which includes an activated carbon filter system 1 , two photocatalytic reactors 2 , an aeration system, a flow meter 3 , an ultraviolet lamp 4 , a circulation system and a motor 5 .

Among them, the motor 5 provides power for the operation of the whole device. This embodiment adopts a domestic small motor with an efficiency of 87%, a design lift of 0.8m, and a design flow of Q _max =50L/d. Therefore, a motor with a power of 5W is selected.

Activated carbon filtration system 1 selects a fixed bed adsorber, a cylinder made of plexiglass, filled with activated carbon balls, and specifically selects coal-like activated carbon as an adsorbent for filtration and preliminary pretreatment of brewery wastewater before photocatalysis. There is a water volume regulating valve, which can be unloaded, which is convenient for the replacement and recycling of activated carbon balls.

Specifically, the calculation of the activated carbon adsorption device is as follows: the designed flow rate Q _max = 50L/d; the design size of the activated carbon column D _{activated carbon} = 60 mm; the height of the adsorption layer L = 0.4 m; the activated carbon bulk density ρ _b = 550 kg/m ³ ;

Therefore, the activated carbon filtration system is designed as follows: the water flow velocity in the activated carbon column is 0.2m/s; the amount of adsorbent is 0.62kg.

The photocatalytic reactor 2 is designed in the shape of a hollow cylinder, filled with TiO ₂ /ACF composite material, and the hollow part is used as the lamp source installation place. The ultraviolet lamp 3 is used in the research of ultraviolet photocatalytic oxidation. The inside and outside of the reactor 2 receive light evenly, thereby improving the catalytic effect.

Specifically, the photocatalytic reactor 2 is designed as follows: the height of the reactor is L=0.6 m, the outer diameter of the reactor is 60 mm, and the inner diameter of the reactor is 20 mm.

The content of O ₂ in the water is one of the important factors affecting the photocatalytic efficiency. In order to improve the removal efficiency of pollutants, an aeration system is installed in this embodiment.

Improve aeration efficiency and air utilization: reduce the size of bubbles, increase the number of bubbles, improve the turbulence of the liquid, increase the installation depth of the aerator, and prolong the contact time between the bubbles and the liquid.

The circulation system enables the sewage to be fully treated, the pollutants are fully degraded, and the effluent water quality standard is reached.

The effluent quality of the embodiment of the utility model meets the first-class A standard (COD<50mg/L) in the pollutant discharge standard of urban sewage treatment plant.

The cost of a photocatalytic treatment device for organic wastewater provided by the present utility model can be seen in Table 1.

Table 1 Economic and Technical Analysis

The total investment of the equipment budget in this embodiment is 1280 yuan. In order to respond to various emergencies, the equipment design budget is 1500 yuan. The electricity required to treat 1L of water is 0.02 yuan, the required activated carbon fiber is 0.5 yuan, and the composite material is 0.5 yuan.

The method for treating organic wastewater by the above-mentioned organic wastewater photocatalytic treatment device is as follows:

(1) Pretreatment of waste water: The filtered waste water is the waste water flowing out from the sewage treatment tank 6, which flows into the activated carbon filter system 1 made of plexiglass, and the activated carbon balls are filled inside, which are used for filtration before photocatalysis of brewery wastewater, Adsorption and decolorization and deodorization of brewery wastewater can reduce the chromaticity of brewery wastewater and the concentration of suspended substances, and optimize the conditions for the next step of photocatalytic reaction.

Because the content of O ₂ in the water is one of the important factors affecting the photocatalytic efficiency, in order to improve the removal efficiency of pollutants, the wastewater is filtered and flowed into the aeration system for aeration treatment.

(2) Photocatalytic oxidation treatment: The wastewater after aeration treatment flows into the photocatalytic reactor 2. When the titanium dioxide collides with water, the surface will absorb the H ₂ O molecules of the attached OH ^- , and the photo-excited (H ⁺ ) These molecules can be oxidized, and the formed high-energy hydroxyl groups are adsorbed to the catalyst surface, so there will be a large amount of ﹒ in the TiO ₂ surface layer. OH radicals.

From more experiments, it is known that since many organics have lower oxygen potentials than _TiO2 , they can also be oxidized by the holes released by _TiO2 . When the photon energy irradiates the surface of TiO ₂ , electrons are released, and these electrons can react with O in the system to generate free radicals of peroxide ions. The generated peroxide ion free radicals can also be converted into HO ₂ ﹒ , H ₂ O ₂ . In addition, · OH, HO ₂ ﹒ And H ₂ O ₂ can be converted into each other.

It can be seen from the above discussion that the catalytic mechanism of photocatalytic reaction of TiO ₂ can be counted as the following points:

TiO ₂ +hv→TiO ₂ +e ^- +h ⁺

H ₂ O+h ⁺ →﹒ OH+h ⁺

OH ^- +h+→﹒ OH

O adsorbed _on the surface of free electrons undergoes the following reactions:

O ₂ +e ^- →﹒ O ₂ ^-

·O ₂ ^- +H ₂ O→HO ₂ ﹒ +OH ^-

Because HO ₂ ﹒ Free radicals are extremely unstable and will further produce the following reactions:

2HO ₂ ﹒ →O ₂ +H ₂ O ₂

HO ₂ ﹒ +H ₂ O+e-→H ₂ O ₂ +OH ^- ,

H ₂ O ₂ +e ^- →﹒ OH+OH ^-

After the above series of reactions, a variety of free radicals with strong oxidative or reducing power will be produced. Due to the high activity of these particles and almost no selectivity to the reactants, they can destroy the C—C, C—N, C—H, C—O, N—H and O—H bonds of organic matter, thereby oxidizing many The organic substances in contact with TiO ₂ can be transformed into non-toxic and harmless inorganic substances.

(3) Post-treatment: After a period of repeated filtration and photocatalytic reaction, the treated water overflows from the reservoir, passes through the contact tank, and is finally discharged from the bus metering tank.

The effects that can be achieved by the photocatalytic treatment device for organic wastewater according to the present invention will be described below through simulation experiments.

(1) Influence of catalyst dosage on removal efficiency

In the self-made reaction apparatus, the photocatalytic simulation experiment of methyl orange was carried out.

Homemade _TiO2 /ACF catalytic materials (3g, 6g, 10g) were added to the reactor, respectively. A simulation experiment was carried out on 30 mg/L methyl orange 4L, and the water sample was taken out of the reactor every 10 minutes to measure its absorbance, and then calculate its concentration. The variation curve of catalyst dosage with time as shown in Figure 2 is obtained.

It can be seen from Figure 2 that when the addition amount of the composite material is 3g, the removal efficiency of methyl orange after the reaction for 120min is 44.65%; when the addition amount of the composite material is 6g, the removal efficiency of methyl orange after the reaction for 120min is 44.65%. It can reach 75.2%; when the addition amount of composite material is 10g, the removal rate of methyl orange can reach 75.2% in 100min reaction time, and the removal rate can reach 80.6% in 120min reaction time. The following conclusions can be drawn: when the addition amount of the simulated reactor is more than 6g and the reaction time is more than 120min, the removal rate of methyl orange is more than 75% even under the simple photocatalysis.

(2) Effect of catalyst concentration on removal efficiency

In the self-made reactor, 3g TiO ₂ /ACF catalytic material was used to treat methyl orange with a volume of 4L and concentrations of 30mg/L and 50mg/L for 120min, and the change of the effect of reaction time on removal efficiency was obtained as shown in Figure 3. curve.

It can be seen from Figure 3 that when the methyl orange concentration is low, the removal rate of pollutants is high in the first 60 minutes, and the reaction slows down after 60 minutes. When the concentration of methyl orange is high, the removal rate of pollutants is low at first. With the change of reaction time, the concentration of pollutants in the system decreases and the removal rate increases.

(3) Influence of catalyst shape on removal efficiency

Methyl orange with a volume of 4 L and a concentration of 30 mg/L was treated with 6 g of strip-shaped and block-shaped catalytic materials for 120 min. The results are shown in Figure 4.

It can be seen from Figure 4 that the bulk catalytic material has a relatively high removal rate before 120 min due to its relatively uniform filling. degradation is not stable enough. Therefore, the utility model adopts the block-shaped catalytic material.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. an organic waste water photocatalytic treatment device, is characterized in that, comprises a filtration system, the filtration system is communicated with the sewage treatment tank; a photocatalytic reaction system, the input end of the photocatalytic reaction system is connected with the output end of the filtering system, and a lamp source is installed inside the photocatalytic reaction system; an aeration system, the aeration system is communicated with the photocatalytic reaction system; and circulation pipes; And the operating power of the filtering system, the photocatalytic reaction system, the aeration system and the circulation pipeline is provided by an electric motor. 2 . The device for photocatalytic treatment of organic wastewater according to claim 1 , wherein the filtering system is any one of a fixed bed adsorber, a moving bed adsorber or a fluid bed adsorber. 3 . 3 . The device for photocatalytic treatment of organic wastewater according to claim 2 , wherein the filter system is a fixed-bed adsorber, and the fixed-bed adsorber is made of organic glass filled with activated carbon balls. 4 . 4 . The device for photocatalytic treatment of organic wastewater according to claim 2 or 3 , wherein a detachably connected water volume regulating valve is provided at the bottom of the filter system. 5 . 5 . The device for photocatalytic treatment of organic wastewater according to claim 1 , wherein the photocatalytic reaction system is composed of a plurality of photocatalytic reactors connected in series. 6 . 6 . The device for photocatalytic treatment of organic wastewater according to claim 5 , wherein the photocatalytic reactor is filled with TiO ₂ /ACF composite material. 7 . 7 . The device for photocatalytic treatment of organic wastewater according to claim 1 , wherein the lamp source is an ultraviolet lamp. 8 . 8 . The device for photocatalytic treatment of organic wastewater according to claim 1 , wherein a flow meter is provided on one side of the water inlet of the filtration system. 9 .

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