CN102614777A - Photocatalytic oxidation treatment system of sludge odor and method for treating sludge odor by utilizing same - Google Patents

Abstract

A sludge odor photocatalytic oxidation treatment system and a method for treating sludge odor using the system relate to the field of solid waste treatment. The present invention provides a sludge odor photocatalytic oxidation treatment system and a method for treating sludge odor using the system. The sludge odor photocatalytic oxidation treatment system includes an odor collection device, an odor filter, a fan, a photocatalytic oxidation purifier, an activated carbon adsorption device and a control device. The method for treating odor is carried out as follows: the odor collection device Collect the odor generated in all links of the sludge treatment process, and send the odor to the odor filter at a flow rate of 1000-2500m ³ /h. After the odor is filtered, it is sent to the photocatalytic oxidation purifier by the fan. Then it is discharged after being treated by an activated carbon adsorption device. The invention adopts photocatalytic oxidation to treat sludge odor, and has the advantages of no side effect, no secondary pollution, high treatment efficiency and the like. The invention is used for odor treatment in large and medium-sized sludge treatment projects.

Description

A photocatalytic oxidation treatment system for sludge odor and a method for using it to treat sludge odor

technical field

The invention relates to the field of solid waste treatment. the

Background technique

With the acceleration of social development and urbanization, the construction of sewage treatment plants has increased, and the output of sludge has also increased rapidly. The treatment and disposal of sludge has become a new focus in comprehensive environmental management. Because the sludge emits odor, it will have adverse effects on the surrounding environment and operators during the process of sludge treatment and disposal, so the odor generated by the sludge should be collected and treated. The main components of sludge odor are hydrogen sulfide, ammonia and other inorganic substances, and methyl mercaptan, methylamine, methyl sulfide, etc. the

Deodorization technology developed relatively early in foreign countries and has a wide range of applications. In China, it has not been developed for a long time and is subject to various constraints, such as technology, industry, and even price and other factors. the

At present, there are mainly physical, chemical and biological treatment methods for odor control at home and abroad. The most commonly used physical methods are the atmospheric dilution method and the adsorption method. Chemical deodorization processes mainly include combustion treatment method, wet chemical absorption method, active oxygen deodorization method and high-energy ion method. Biological deodorization methods mainly include activated sludge method, biological soil method, biological scrubbing method, biological trickling filtration method and biological filtration method. the

However, there is currently no method and device for photocatalytic oxidation treatment of the odor generated during the sludge treatment process. the

Contents of the invention

The present invention provides a sludge odor photocatalytic oxidation treatment system and a method for treating sludge odor using the system. the

The sludge odor photocatalytic oxidation treatment system of the present invention includes an odor collection device, an odor filter, a fan, a photocatalytic oxidation purifier, an activated carbon adsorption device, and a control device; wherein, the outlet of the odor collection device and the odor filter The air inlet of the odor filter is connected to the air inlet of the fan, the outlet of the fan is connected to the inlet of the photocatalytic oxidation purifier, and the outlet of the photocatalytic oxidation purifier is connected to the air inlet of the activated carbon adsorption device. The control device is connected with the fan and the photocatalytic oxidation purifier, and the outlet of the activated carbon adsorption device is connected with the external pipeline. the

The odor collection device is used to collect the odor generated in the sludge treatment system to ensure that the operating environment will not be affected. the

The odor filter is used to filter out suspended particles and aerosols in the odor to prevent excessive dust content from affecting the performance of the photocatalytic oxidation purifier. the

Fan, the device that produces odor during the process of transporting sludge. the

The photocatalytic oxidation purifier is used to treat various toxic and harmful gases in the odor. the

The activated carbon adsorption device is used to adsorb the untreated residual odor and play a role in ensuring the quality of the exhaust gas. the

The control device is used to control the switch of the whole system, as well as the size of the ventilation volume and the number of UV lamp switches. And send the output terminals of each individual equipment operation and fault status to the central control room, and the input terminals that accept the control commands sent from the central control room. the

The method for photocatalytic oxidation treatment of sludge odor gas is carried out according to the following steps: the odor gas generated in each link of the sludge treatment process is collected together by the odor collection device (1), and the odor gas is collected at a rate of 1000-2500m ³ /h The flow rate is sent to the odor filter (2), and after the odor is filtered, it is sent to the photocatalytic oxidation purifier (4) by the fan (3), and then discharged after being treated by the activated carbon adsorption device (5).

The invention treats the sludge odor through photocatalytic oxidation, and the photocatalytic oxidation utilizes the redox ability of the photocatalyst under ultraviolet irradiation to purify pollutants. Photocatalysts are semiconductor materials, including TiO ₂ , ZnO, Fe ₂ O ₃ , CdS, and WO ₃ , etc. Among them, TiO ₂ has good photocorrosion resistance and catalytic activity, and is stable in performance, cheap and easy to obtain, non-toxic and harmless , is currently recognized as the best photocatalyst. When light with energy greater than the forbidden band width of TiO ₂ irradiates the semiconductor, photoexcited electrons jump to the conduction band to form conduction band electrons, while leaving holes in the valence band. Due to the discontinuity of the semiconductor energy band, electrons and holes have a long lifetime. They can move under the action of an electric field or by diffusion, and undergo redox reactions with substances adsorbed on the surface of semiconductor catalyst particles, or be absorbed by surface crystals. Capture flaws. Holes and electrons may also recombine directly inside or on the surface of the catalyst particle. The holes can interact with OH ^- or H ₂ O adsorbed on the surface of catalyst particles to generate HO·. HO· is a highly active particle that can non-selectively oxidize and mineralize a variety of organic substances, and is generally considered to be the main oxidant in photocatalytic reaction systems. Photocatalytic treatment of environmental pollutants is based on the oxidation or reduction of pollutants by some free radicals in the catalytic reaction process. The reaction pathway is usually HO attack or direct hole attack. Compounds sensitive to visible light may also be decomposed through excited states. .

The beneficial effects of the present invention are:

1. Applying TiO ₂ photocatalytic oxidation technology to sludge odor purification has the advantages of photocatalysis without side effects, no secondary pollution, and high treatment efficiency;

2. Combined with photocatalytic technology, followed by activated carbon adsorption, which not only ensures the treatment effect, but also prolongs the regeneration time of activated carbon, so it has the advantages of low energy consumption and low operating costs;

3. Less initial investment, no civil construction costs, flexible installation, and low system noise;

4. People-oriented, while improving the working environment, reduce the concentration of gas pollutants in the working space, and effectively reduce the concentration of the odor of the exhaust gas;

5. Independent system, easy management and maintenance, unmanned operation can be realized, the equipment can be started and stopped according to the actual situation, and PLC remote control can be realized. the

The invention is used for odor treatment in large and medium-sized sludge treatment projects. the

Description of drawings

Fig. 1 is the structure schematic diagram of the sludge odor photocatalytic oxidation treatment system of the present invention, wherein 1 is an odor collection device, 2 is an odor filter, 3 is a fan, 4 is a photocatalytic oxidation purifier, and 5 is an activated carbon adsorption device , 6 is the control device, 7 is the shell, 8 is the ultraviolet light source, and 9 is the quartz tube;

Fig. 2 is a flow chart of the method for treating sludge odor by utilizing the sludge odor photocatalytic oxidation treatment system in the present invention. the

Detailed ways

The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments. the

Specific Embodiment 1: In this embodiment, the sludge odor photocatalytic oxidation treatment system includes an odor collection device 1, an odor filter 2, a fan 3, a photocatalytic oxidation purifier 4, an activated carbon adsorption device 5, and a control device 6; , the outlet of the odor collecting device 1 is connected with the inlet of the odor filter 2, the outlet of the odor filter 2 is connected with the inlet of the fan 3, and the outlet of the fan 3 is connected with the inlet of the photocatalytic oxidation purifier 4 , the outlet of the photocatalytic oxidation purifier 4 is connected with the air inlet of the activated carbon adsorption device 5 , and the control device 6 is connected with the fan 3 and the photocatalytic oxidation purifier 4 . the

The odor collection device 1, odor filter 2, fan 3, photocatalytic oxidation purifier 4, activated carbon adsorption device 5 and control device 6 in this embodiment are all commercially available products. the

This embodiment applies TiO ₂ photocatalytic oxidation technology to the purification of sludge odor, which has the advantages of no side effects, no secondary pollution, and high treatment efficiency; combined with photocatalytic technology, the subsequent use of activated carbon adsorption not only ensures the treatment effect , and prolong the regeneration time of activated carbon, which has the advantages of low energy consumption and low operating costs; less initial investment, no civil construction costs, flexible installation, and low system noise; people-oriented, improving the working environment while reducing gas pollutants in the working space The concentration can effectively reduce the odor concentration of the exhaust gas; independent system, easy management and maintenance, can realize unmanned operation, can start and stop the equipment according to the actual situation, and realize PLC remote control.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that the odor filter 2 is a screen filter type air cleaner or a spray dust collector. Others are the same as in the first embodiment. the

Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the photocatalytic oxidation purifier 4 includes a housing 7, 2 to 10 ultraviolet light sources 8 and quartz tubes 9, and the ultraviolet light sources 8 and quartz tubes 9 are arranged Inside the casing 7, the ultraviolet light source 8 is arranged around the quartz tube 9, and the inside of the quartz tube 9 is filled with a titanium dioxide catalyst. Others are the same as in the first or second embodiment. the

Embodiment 4: This embodiment differs from Embodiments 1 to 3 in that the wavelength of the ultraviolet light source 8 is 254 nm. Others are the same as those in the first to third specific embodiments. the

Embodiment 5: This embodiment differs from Embodiment 1 to Embodiment 4 in that: the housing 7 of the photocatalytic oxidation purifier 4 is made of steel with a thickness of 3-8 mm. Others are the same as one of the specific embodiments 1 to 4. the

In this embodiment, the main material of the external device adopts a steel structure to prevent ultraviolet rays from leaking. the

Embodiment 6: This embodiment differs from Embodiments 1 to 5 in that the control device 6 includes an output terminal and an input terminal. Others are the same as one of the specific embodiments 1 to 5. the

Specific embodiment seven: the method for the photocatalytic oxidation treatment of sludge odor gas in this embodiment is carried out according to the following steps: the odor generated by each link of the sludge treatment process is collected together by the odor collection device 1, and the odor is collected in the form of The flow rate of 1000～2500m ³ /h is sent to the odor filter 2. After the odor is filtered, it is sent to the photocatalytic oxidation purifier 4 by the fan 3, and then it is discharged after being treated by the activated carbon adsorption device 5.

This embodiment applies TiO ₂ photocatalytic oxidation technology to the purification of sludge odor, which has the advantages of no side effects, no secondary pollution, and high treatment efficiency; combined with photocatalytic technology, the subsequent use of activated carbon adsorption not only ensures the treatment effect , and prolong the regeneration time of activated carbon, which has the advantages of low energy consumption and low operating costs; less initial investment, no civil construction costs, flexible installation, and low system noise; people-oriented, improving the working environment while reducing gas pollutants in the working space The concentration can effectively reduce the odor concentration of the exhaust gas; independent system, easy management and maintenance, can realize unmanned operation, can start and stop the equipment according to the actual situation, and realize PLC remote control.

Adopt the following examples to verify the beneficial effects of the present invention:

Embodiment one: (refer to Fig. 1, Fig. 2 to understand present embodiment)

The photocatalytic oxidation treatment system for sludge odor in this embodiment includes an odor collection device 1, an odor filter 2, a fan 3, a photocatalytic oxidation purifier 4, an activated carbon adsorption device 5, and a control device 6; wherein, the odor collection device The outlet of 1 is connected with the air inlet of odor filter 2, the outlet of odor filter 2 is connected with the inlet of fan 3, the outlet of fan 3 is connected with the inlet of photocatalytic oxidation purifier 4, photocatalytic oxidation purification The outlet of the device 4 is connected with the air inlet of the activated carbon adsorption device 5, the control device 6 is connected with the fan 3 and the photocatalytic oxidation purifier 4, and the outlet of the activated carbon adsorption device 5 is connected with the external pipeline. the

The odor filter 2 in the present embodiment is a strainer filter type air cleaner; the photocatalytic oxidation purifier 4 comprises a housing 7, 2 ultraviolet light sources 8 and a quartz tube 9, and the ultraviolet light source 8 and the quartz tube 9 are arranged on the shell Inside the body 7, the ultraviolet light source 8 is arranged around the quartz tube 9, and the interior of the quartz tube 9 is filled with a titanium dioxide catalyst; the wavelength of the ultraviolet light source 8 is 254nm; the material of the housing 7 of the photocatalytic oxidation purifier 4 is steel, and the thickness is 3mm. the

The odor collection device 1, odor filter 2, fan 3, photocatalytic oxidation purifier 4, activated carbon adsorption device 5 and control device 6 in this embodiment are all commercially available products. the

The method for photocatalytic oxidation treatment of sludge odor gas is ^carried out in the following steps: the odor gas generated in various links of the sludge treatment process is collected together by the odor collection device 1, and the odor gas is sent to the The odor filter 2, after the odor is filtered, is sent to the photocatalytic oxidation purifier 4 by the blower 3, and then discharged after being treated by the activated carbon adsorption device 5.

In this embodiment, the odor collection device is used to collect the odor generated in the sludge treatment system to ensure that the operating environment is not affected; the odor filter is used to filter out suspended particles and aerosols in the odor, Prevent excessive dust content from affecting the performance of the photocatalytic oxidation purifier; fan, a device that generates odor during the sludge treatment process; photocatalytic oxidation purifier, used to treat various toxic and harmful gases in the odor; activated carbon adsorption device , to absorb the untreated residual odor, and to ensure the exhaust quality; the control device is used to control the switch of the whole system, as well as the size of the ventilation volume and the number of UV lamp switches, and transmit the operation and failure of each individual equipment to the central control room The output terminal of the state and the input terminal of the control command sent by the central control room. the

In the photocatalytic oxidation method for treating sludge odor in this embodiment, the odor generated in the sludge treatment process is treated by a fan-induced photocatalytic oxidation deodorization system. Before the odor reaches the photocatalytic oxidation purifier, it is filtered through a filter to remove suspended particles and aerosols, so as not to affect the performance of the photocatalytic oxidation purifier and activated carbon adsorption device. After the suspended particles and aerosols in the air are filtered out by the filter, in the photocatalytic oxidation purifier, the highly active hydroxyl radical HO generated on the surface of the catalyst particles is used to efficiently oxidize various pollutants in the sludge odor. Substances, odor components in the odor are oxidized by high-energy oxygen ions to decompose pollution factors such as methyl mercaptan, ammonia, hydrogen sulfide, etc. After a series of reactions, stable and harmless small molecules such as carbon dioxide and water are finally generated. The purified gas is finally adsorbed by activated carbon and then discharged through the pipeline. the

The sludge odor treatment device of this embodiment and the method for using it to treat sludge odor by photocatalytic oxidation, with the difference in the amount of sludge treatment, the amount and concentration of odor generated in the system also change accordingly, and each parameter It can be adjusted according to the calculation results of actual operating conditions. Therefore, on the premise of not violating the scope of the appended claims of the present invention, some appropriate changes can be made to the selection of key parameters in the present invention during the specific implementation process. the

Claims (7)

1. a mud foul smell Treatment by Photocatalysis Oxidation system is characterized in that mud foul smell Treatment by Photocatalysis Oxidation system comprises foul smell gathering-device (1), foul smell filter (2), blower fan (3), photochemical catalytic oxidation clarifier (4), absorbent charcoal adsorber (5) and control device (6); Wherein, The outlet of foul smell gathering-device (1) links to each other with the air inlet of foul smell filter (2); The outlet of foul smell filter (2) links to each other with the air inlet of blower fan (3); The outlet of blower fan (3) links to each other with the inlet of photochemical catalytic oxidation clarifier (4), and the outlet of photochemical catalytic oxidation clarifier (4) links to each other with the air inlet of absorbent charcoal adsorber (5), and control device (6) connects with blower fan (3) and photochemical catalytic oxidation clarifier (4).

2. a kind of mud foul smell Treatment by Photocatalysis Oxidation according to claim 1 system is characterized in that foul smell filter (2) is strainer filtering formula air purifier or spray deduster.

3. a kind of mud foul smell Treatment by Photocatalysis Oxidation according to claim 1 system; It is characterized in that photochemical catalytic oxidation clarifier (4) comprises housing (7), 2～10 ultraviolet sources (8) and quartz ampoule (9); Ultraviolet source (8) and quartz ampoule (9) are arranged on the inside of housing (7); Ultraviolet source (8) be arranged on quartz ampoule (9) around, the inside filling TiO 2 catalyst of quartz ampoule (9).

4. a kind of mud foul smell Treatment by Photocatalysis Oxidation according to claim 3 system, the wavelength that it is characterized in that ultraviolet source (8) is 254nm.

5. according to claim 1 or 3 described a kind of mud foul smell Treatment by Photocatalysis Oxidation systems, it is characterized in that the material of the housing (7) of photochemical catalytic oxidation clarifier (4) is a steel, thickness is 3～8mm.

6. a kind of mud foul smell Treatment by Photocatalysis Oxidation according to claim 1 system is characterized in that control device (6) comprises lead-out terminal and input terminal.

7. utilize the method for the described a kind of mud foul smell Treatment by Photocatalysis Oxidation system handles mud foul smell of claim 1; It is characterized in that utilizing the method for mud foul smell Treatment by Photocatalysis Oxidation system handles mud foul smell to carry out according to the following steps: by foul smell gathering-device (1) foul smell that each link of sludge handling process produces is collected together, with foul smell with 1000～2500m ³The flow velocity of/h is delivered to foul smell filter (2), and foul smell is delivered to photochemical catalytic oxidation clarifier (4) by blower fan (3) after filtering, handles the back discharging through absorbent charcoal adsorber (5) then.

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