Sludge wet oxidation waste gas soil filter treatment device

Abstract

The utility model discloses a sludge wet oxidation waste gas soil filter treatment device which comprises a spray absorption unit, a biological soil filter unit and a waste gas collection and exhaust unit, the spraying absorption unit performs reverse heat and mass transfer on waste gas to be treated and an intermediate medium in a spraying tower, the waste gas subjected to heat exchange enters the biological soil filter tank unit, is subjected to microbial decomposition through a filter tank filler layer and an active soil layer, is collected by a transparent collection cover of the waste gas collection and exhaust unit, and is subjected to high-altitude up-to-standard emission. The waste gas treatment device is low in waste gas treatment cost, simple, stable and reliable; the transparent collecting cover is made of a light-transmitting material, so that photosynthesis of herbaceous plants can be maintained, and strain loss caused by rain wash can be prevented; and the waste gas collection and exhaust unit is used for organized emission, so that enrichment of organic matters in a factory environment is avoided. The device combines spraying and biological soil filter unit treatment processes, achieves up-to-standard emission of waste gas, and guarantees long-term stable operation of the system.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas deodorization technical field, especially a kind of sludge wet oxidation waste gas soil filter treatment device. BACKGROUND

[0002] Wet oxidation reaction technology is in high temperature and high pressure environment by pure oxygen or oxygen-enriched air, so that the cell wall of organic solid waste is broken, macromolecular organic matter is hydrolyzed into small molecular organic acid and CO2 etc., and the organic solid waste after reaction is easy to realize solid-liquid separation, with the advantages of low processing cost, environmental friendliness, small land occupation etc.However, the waste gas generated in the process of sludge treatment is complex, and if it is directly discharged, it will cause secondary pollution.

[0003] At present, most of the waste gas of sludge treatment is directly discharged into the atmosphere after being treated by multi-stage alkali washing spraying technology or biological filter technology, which has high processing cost and poor adaptability to load fluctuation.The combination scheme of spraying treatment + biological soil filter unit deodorization technology is another technical route, which uses the microorganisms in the filler layer and soil layer to decompose the odor components and convert them into energy substances needed for their growth, and has relatively low processing cost and simple process.

[0004] However, the biological soil filter unit has the problem of unstable operation efficiency, and in the summer with frequent rain, the rainwater erosion will cause a large amount of loss of bacteria;At the same time, the molecular weight of organic volatile gas generated by sludge wet oxidation is relatively large, although it can be discharged after being treated by soil filter, but in the long-term operation process, the enrichment of organic acid and other substances in the soil filter can easily lead to the corrosion and apoptosis of herbaceous plants, and in some low-pressure windless weather conditions, the waste gas may be enriched in the surrounding environment and cause secondary pollution to the environment. UTILITY MODEL CONTENTS

[0005] The utility model is to overcome the defects in the prior art, provide a kind of sludge wet oxidation waste gas soil filter treatment device, which not only has low processing cost, simple processing technology, high stability and reliability, waste gas treatment effect is not influenced by rainy weather, but also can reduce the enrichment of pollutants in the surrounding environment, especially in some low-pressure windless weather conditions, it can ensure that the environment is not enriched with waste gas, and avoid the death of herbaceous plants, ensure the long-term stable operation of soil filter.

[0006] To achieve the above object, the utility model provides a kind of sludge wet oxidation waste gas soil filter treatment device, comprising:

[0007] The spray absorption unit comprises a spray tower, a liquid pool, a first spray assembly, a waste gas inlet pipe and a waste gas outlet pipe. The waste gas inlet pipe is arranged on the spray tower to collect and guide the waste gas generated in the sludge wet oxidation treatment plant and system into the spray tower. The first spray assembly is arranged in the spray tower above the waste gas inlet pipe and contacts the waste gas flowing from bottom to top through the spray intermediate medium to exchange heat and mass. The liquid pool is arranged at the bottom of the spray tower to receive the intermediate medium sprayed by the first spray assembly. The waste gas outlet pipe is arranged on the spray tower above the first spray assembly to guide the waste gas to be discharged.

[0008] The biological soil filter unit comprises a filter, an air distribution pipe arranged at the bottom of the filter, a filter filling layer arranged above the air distribution pipe, an active soil layer arranged above the filter filling layer, a second spray assembly installed in or above the active soil layer, and a reclaimed water well. The inlet of the air distribution pipe is connected to the waste gas outlet pipe of the spray absorption unit through a pipeline. The filter filling layer and the active soil layer are cultured with a composite bacterial strain capable of biodegrading waste gas. The active soil layer is planted with herbaceous plants for absorbing waste gas. The reclaimed water well is used to provide water required by the second spray assembly for spraying.

[0009] The waste gas collection and discharge unit comprises a transparent collection cover installed on the upper part of the filter to collect and discharge the gas treated by the biological soil filter unit.

[0010] Further, the spray absorption unit further comprises a first spray circulating pump for pumping the intermediate medium in the liquid pool to the first spray assembly.

[0011] Further, a spray filling layer is arranged inside the spray tower between the first spray assembly and the waste gas inlet pipe.

[0012] Further, a demister is arranged inside the spray tower between the first spray assembly and the waste gas outlet pipe.

[0013] Further, a first fan is arranged on the waste gas inlet pipe.

[0014] Further, the waste gas collection and discharge unit further comprises an exhaust pipe and a second fan. The second fan is used to transport the gas collected by the transparent collection cover to the exhaust pipe.

[0015] Further, an air pressure balancing window is arranged on the transparent collection cover to adjust the internal pressure thereof.

[0016] Further, the reclaimed water well is connected to the filter. The water in the filter can flow back into the reclaimed water well. The water in the reclaimed water well is pumped to the second spray assembly by a second spray circulating pump.

[0017] Further arrangement: the intermediate medium is water, acid liquor or alkali liquor.

[0018] Further arrangement: the spray absorption unit is one stage, or a multi-stage structure connected by series and / or parallel connection.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] 1. The method of combining the spray absorption unit and the biological soil filter unit is used to treat the waste gas generated by sludge wet oxidation treatment, which can ensure that the treated gas meets the discharge standard, and has the characteristics of simple process, high stability and reliability.

[0021] 2. The transparent collection cover installed on the upper part of the soil filter not only does not block sunlight and does not affect the growth of the internal herbaceous plants, but also avoids the loss of a large number of bacteria caused by rainwater erosion in the rainy season; the sealed environment reduces the evaporation of spray water to some extent, which is beneficial to reducing the amount of spray water.

[0022] 3. The waste gas collection and exhaust unit can discharge the remaining organic matter in the treated gas to high altitude, which not only avoids the enrichment of organic matter in the factory environment, but also is beneficial to the diffusion and decomposition of organic matter, especially in the case of low pressure and little wind. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of a sludge wet oxidation waste gas soil filter treatment device of the utility model.

[0024] The following reference signs are marked on the drawings in combination with the drawings:

[0025] 1. Spray absorption unit; 11. Spray tower; 12. Liquid storage tank; 13. Spray packing layer; 14. First spray assembly; 15. Demister; 16. First spray circulating pump; 17. Waste gas inlet pipe; 18. First fan; 19. Waste gas outlet pipe;

[0026] 2. Biological soil filter unit; 21. Filter tank; 22. Air distribution pipe; 23. Filter tank packing layer; 24. Active soil layer; 25. Second spray assembly; 26. Second spray circulating pump; 27. Reclaimed water well;

[0027] 3. Waste gas collection and exhaust unit; 31. Transparent collection cover; 32. Second fan; 33. Exhaust cylinder; 34. Air pressure balance window. DETAILED DESCRIPTION

[0028] One specific embodiment of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiment.

[0029] The sludge wet oxidation waste gas soil filter treatment device according to the present application is shown in Figure 1 The sludge wet oxidation waste gas soil filter treatment device according to the present application is shown in

[0030] In the present embodiment, the spray absorption unit 1 is shown in Figure 1 The spray absorption unit 1 is shown in

[0031] In this embodiment, there is one exhaust gas inlet pipe 17, which is located in the middle of the spray tower 11, that is, the outlet of the exhaust gas inlet pipe 17 is located above the liquid surface of the intermediate medium in the storage tank 12. In other specific embodiments, there may be two or more exhaust gas inlet pipes 17, which are located in the middle or lower part of the spray tower 11. The exhaust gas inlet pipe 17 is located in the lower part of the spray tower 11, that is, the outlet of the exhaust gas inlet pipe 17 is located below the liquid surface of the intermediate medium in the storage tank 12. In this way, the exhaust gas can enter the spray tower 11 under a certain pressure.

[0032] In the above scheme, the intermediate medium is water, acid, or alkali, which needs to be varied according to the composition of the waste gas in the project; the spray absorption unit 1 is a single stage, or a multi-stage structure connected in series and / or parallel, so that the spray absorption unit 1 can achieve water washing, acid washing, alkali washing, or a combination thereof according to the composition of the spray intermediate medium in each stage, thereby enabling the spray absorption unit 1 to achieve a better treatment effect.

[0033] In this embodiment, the biological soil filter unit 2 is as follows: Figure 1 As shown, the system includes a filter bed 21, an air distribution pipe 22 arranged at the bottom of the filter bed 21, a filter bed packing layer 23 arranged above the air distribution pipe 22, an activated soil layer 24 arranged above the filter bed packing layer 23, a second spray assembly 25 installed in or above the activated soil layer 24, and a greywater well 27. The inlet of the air distribution pipe 22 is connected to the exhaust gas outlet pipe 19 of the spray absorption unit 1 via a pipeline. The air distribution pipe 22, through its various branches, ensures that the exhaust gas is evenly distributed within the filter bed 21. The exhaust gas flows from bottom to top through the filter bed packing layer 23 and the activated soil layer 24. The filter bed packing layer 23 and the activated soil layer 24 are inoculated with a composite microbial strain capable of biodegrading the exhaust gas. The activated soil layer 24 is planted with herbaceous plants for absorbing the exhaust gas. Thus, the combination of the composite microbial strain and the herbaceous plants... The waste gas is absorbed and decomposed, thus efficiently treating the waste gas. The greywater well 27 is connected to the second spray assembly 25 through a pipeline, and the water in the greywater well 27 is pumped to the second spray assembly 25 through the second spray circulation pump 26. Preferably, the greywater well 27 is connected to the filter pool 21 so that the water in the filter pool 21 can flow back into the greywater well 27, thus realizing the recycling of water in the biological soil filter unit 2. At the same time, the water in the greywater well 27 is replaced regularly to help avoid the loss of bacteria and improve the waste gas treatment efficiency. The water sprayed by the second spray assembly 25 can not only fully contact and react with the waste gas from bottom to top, but also regulate the humidity and temperature by spraying water into the active soil layer 24 to obtain a suitable environment for the cultivation of compound bacteria and the growth of herbaceous plants.

[0034] In this embodiment, the exhaust gas collection and exhaust unit 3 is as follows: Figure 1As shown, the device comprises a transparent collecting cover 31, a second fan 32 and an exhaust pipe 33; the transparent collecting cover 31 is installed on the upper port of the filter tank 21 for collecting the waste gas treated by the biological soil filter unit 2, and the transparent collecting cover 31 is made of a light-transmitting material, which can maintain the photosynthesis of the herbaceous plants and prevent the loss of bacteria caused by rainwater erosion; the exhaust pipe 33 is communicated with the transparent collecting cover 31 through a pipeline, and the second fan 32 is arranged on the pipeline between the transparent collecting cover 31 and the exhaust pipe 33; the second fan 32 is used for conveying the waste gas collected by the transparent collecting cover 31 to the exhaust pipe 33 for standard emission; the transparent collecting cover 31 is provided with an air suction port corresponding thereto, and the air suction port is preferably arranged on the upper part or the side part of the transparent collecting cover 31; the standard emission height of the exhaust pipe 33 is preferably greater than or equal to 15 m, so that the enrichment of organic volatile gas in the factory area can be effectively avoided, and the problem that the waste gas accumulates near the biological soil filter 21 under adverse weather conditions such as low pressure and little wind and affects the environment can also be avoided.

[0035] In the above scheme, the transparent collecting cover 31 is further provided with an air pressure balance window 34, and the air pressure balance window 34 is preferably arranged on the side part away from the air suction port; by controlling the opening degree of the air pressure balance window 34, the pressure in the transparent collecting cover 31 can be adjusted, and the pressure close to atmospheric pressure is preferably controlled; in this way, the structural damage caused by overpressure or large negative pressure in the transparent collecting cover 31 can be avoided, and the influence of large negative pressure on the activity of microorganisms can also be avoided; in the embodiment, the pressure in the transparent collecting cover 31 can also be controlled by controlling the air volume of the first fan 18 and / or the second fan 32.

[0036] In the above scheme, the top of the transparent collecting cover 31 is a slope structure, so that the excessive accumulation or infiltration of rainwater on the top of the transparent collecting cover 31 is avoided.

[0037] The above disclosure is only an embodiment of the present application, but the present application is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.

Claims

1. A sludge wet oxidation off-gas soil filter treatment apparatus, characterized by, The application relates to a sludge wet oxidation treatment system and method. The system comprises a spray absorption unit, a biological soil filter unit and a waste gas collection and discharge unit. The spray absorption unit comprises a spray tower, a liquid pool, a first spray assembly, a waste gas inlet pipe and a waste gas outlet pipe. The waste gas inlet pipe is arranged on the spray tower to collect and guide the waste gas generated in the sludge wet oxidation treatment plant and system into the spray tower.

2. A sludge wet oxidation off-gas soil filter plant according to claim 1, characterized in that, The first spray assembly is arranged in the spray tower above the waste gas inlet pipe and contacts the waste gas flowing from bottom to top through the spray intermediate medium to exchange heat and mass.

3. The sludge wet oxidation off-gas soil filter treatment device according to claim 1, characterized in that, The liquid pool is arranged at the bottom of the spray tower to receive the intermediate medium sprayed by the first spray assembly.

4. The sludge wet oxidation off-gas soil filter treatment device according to claim 1, characterized in that, The waste gas outlet pipe is arranged on the spray tower above the first spray assembly to guide the waste gas to be discharged.

5. The sludge wet oxidation off-gas soil filter treatment device according to claim 1, characterized in that, The biological soil filter unit comprises a filter, a gas distribution pipe arranged at the bottom of the filter, a filter filling layer arranged above the gas distribution pipe, an active soil layer arranged above the filter filling layer, a second spray assembly installed in or above the active soil layer, and a reclaimed water well.

6. The sludge wet oxidation off-gas soil filter treatment device according to claim 1, characterized in that, The inlet of the gas distribution pipe is connected to the waste gas outlet pipe of the spray absorption unit through a pipeline.

7. The sludge wet oxidation off-gas soil filter treatment device according to claim 1, characterized in that, The filter filling layer and the active soil layer are cultivated with a composite bacterial strain capable of biodegrading waste gas.

8. The sludge wet oxidation exhaust gas soil filter treatment device according to claim 1, characterized by, The active soil layer is planted with herbaceous plants for absorbing waste gas.

9. The sludge wet oxidation exhaust gas soil filter treatment device according to claim 1, characterized by, The reclaimed water well is used to provide water required by the second spray assembly for spraying.

10. The sludge wet oxidation exhaust gas soil filter treatment device according to claim 1, characterized by, The spray absorption unit further comprises a first spray circulating pump for pumping the intermediate medium in the liquid pool to the first spray assembly. A spray filling layer is arranged in the spray tower between the first spray assembly and the waste gas inlet pipe. A demister is arranged in the spray tower between the first spray assembly and the waste gas outlet pipe. A first fan is arranged on the waste gas inlet pipe. The waste gas collection and discharge unit further comprises an exhaust cylinder and a second fan for conveying the gas collected by the transparent collection cover to the exhaust cylinder. An air pressure balance window is arranged on the transparent collection cover to adjust the pressure inside the transparent collection cover. The reclaimed water well is connected to the filter. The water in the filter can flow back into the reclaimed water well. The water in the reclaimed water well is pumped to the second spray assembly by a second spray circulating pump. The intermediate medium is water, acid or alkali. The spray absorption unit is one stage or a multi-stage structure connected in series and / or in parallel.

Images