Deodorization system

Abstract

The utility model provides a deodorization system, which relates to the technical field of waste gas treatment and comprises a deodorization module and a concentration and decrement module, the deodorization module comprises alkaline washing equipment, biological purification equipment and oxidation washing equipment; the concentration decrement module comprises an acid-base adjusting module and a drainage concentration module, the acid-base adjusting module comprises a mixing space, and the drainage concentration module comprises membrane concentration equipment; the deodorization module is connected with the mixing space; the mixing space is connected with membrane concentration equipment, and the membrane concentration equipment is used for concentrating and reducing drained water. According to the sewage treatment device, the discharged water in the deodorization module can be pretreated, acid-base discharged water is neutralized, the subsequent sewage treatment difficulty is reduced, and the adverse effect of oxidative discharged water on subsequent biological treatment sewage is avoided; the water discharge amount of the deodorization equipment is reduced, and the problem that the sewage station cannot be normally consumed due to excessive water discharge amount of the deodorization equipment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a deodorization system. Background Art

[0002] As deodorization standards become increasingly stringent, deodorization becomes increasingly difficult. A combination of multiple deodorization processes is usually required to meet environmental protection requirements. The drainage from deodorization equipment is generally discharged directly to a nearby sewage treatment plant without treatment. This, on the one hand, causes the drainage properties of the deodorization equipment to be unstable, affecting the treatment effect of the sewage treatment equipment. In particular, after the oxidation process is adopted, the oxidative drainage will reduce the efficiency of biological wastewater treatment or even make it ineffective, causing the drainage from the oxidation process to have a greater impact on subsequent sewage treatment. On the other hand, the drainage volume of multiple devices is large, and there is a risk of overloading the sewage treatment equipment.

[0003] In general, the current deodorization equipment has the following defects: unstable drainage causes a decline in the performance of sewage treatment equipment, especially oxidation process drainage will seriously affect the efficiency of biological wastewater treatment equipment; drainage from multiple devices increases the load on sewage treatment equipment, which not only wastes water resources but also poses the risk of overload; in response to the above defects, this application is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a deodorization system, which reduces the drainage volume of the deodorization equipment and reduces the impact on subsequent sewage treatment equipment by pre-treating the drainage and concentrating and reducing the drainage volume.

[0005] In order to solve the above problems, the present invention provides a deodorization system, including a deodorization module and a concentration and reduction module; the deodorization module includes an alkaline washing device, a biological purification device and an oxidative washing device, and uses alkaline washing to remove some acidic pollutants and water-soluble pollutants in the exhaust gas, and uses the biological purification device to remove most of the biodegradable pollutants. The small amount of pollutants remaining at the outlet of the biological purification device, including non-biodegradable or insoluble substances, are removed by the oxidative washing device at the end, so that the malodorous exhaust gas is deeply purified; the concentration and reduction module includes an acid-base adjustment module and a drainage concentration module, the acid-base adjustment module includes a mixing space, and the drainage concentration module includes a membrane concentration device; the deodorization module is connected to the mixing space, so that the drainage of the deodorization module can be acid-base neutralized in the mixing space; the mixing space is connected to the membrane concentration device, and the membrane concentration device concentrates and reduces the drainage.

[0006] According to one embodiment of the present invention, the acid-base adjustment module further includes a dosing tank and a water quality monitor. The water quality monitor is used to monitor water parameters in the mixing space, which generally include pH, ORP, conductivity, liquid level, etc. The dosing tank is used to add the corresponding type of reagent based on the reading of the water quality monitor. The dosing tank can be set to automatically add the corresponding reagent or manually control the addition based on the reading.

[0007] According to an embodiment of the present invention, the drainage concentration module further includes a water storage space, the membrane concentration device is connected to the water storage space, and the concentrated fresh water enters the water storage space for storage.

[0008] According to an embodiment of the present invention, the water storage space is connected to the deodorization module and is reused by the deodorization module or other equipment, thereby achieving a water-saving effect.

[0009] According to an embodiment of the present invention, a check valve is installed on the drain pipe of the biological purification equipment to prevent the drainage of the oxidation washing equipment from entering the circulating water tank of the biological purification equipment and causing side effects on the biological purification equipment.

[0010] According to an embodiment of the present invention, the membrane concentration device is provided with a bypass system 1, which is used during maintenance or troubleshooting of the membrane concentration device.

[0011] According to one embodiment of the present invention, the drainage concentration module also includes an evaporator, the membrane concentration equipment is connected to the evaporator, and the evaporator is connected to the water storage space. The concentrated concentrated water can be discharged to the sewage treatment equipment or evaporated through the evaporator. After the water vapor is condensed, it enters the water storage tank for storage, and the evaporation residue is collected and utilized or further processed.

[0012] According to one embodiment of the present invention, the evaporator is provided with a bypass system 2, which can not only change the destination of the membrane concentrated concentrated water during evaporator equipment maintenance or fault repair; but also flexibly adjust the drainage volume discharged to the sewage treatment equipment according to the operating load of the sewage treatment equipment, thereby avoiding the risk of overloading the sewage treatment equipment.

[0013] According to an embodiment of the present invention, the membrane concentration equipment adopts a reverse osmosis system, which is a single-stage reverse osmosis or multi-stage reverse osmosis.

[0014] According to one embodiment of the present invention, a filtering device is provided between the mixing space and the membrane concentration device to prevent scaling on the membrane surface and effectively extend the service life of the membrane.

[0015] The beneficial effect of the present invention is that, through the coordinated use of the deodorization module and the concentration and reduction module, the drainage in the deodorization module can be pretreated, the neutralization of acid and alkaline drainage can be achieved, the difficulty of subsequent sewage treatment is reduced, and the adverse effects of oxidative drainage on subsequent biological treatment sewage are avoided; and, by setting up the deodorization equipment drainage concentration and reduction module, the drainage volume of the deodorization equipment is reduced, the impact on subsequent sewage treatment equipment is reduced, and the problem of excessive drainage of the deodorization equipment and the inability of the sewage station to normally absorb it is solved; the fresh water after membrane concentration enters the water storage space for storage and is reused by the deodorization equipment or other equipment, thereby achieving a water-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 Schematic diagram of the overall structure of the deodorization system;

[0018] In the figure: 1-alkaline washing equipment; 11-alkaline washing equipment inlet; 12-alkaline washing equipment outlet; 13-alkaline washing equipment circulating water tank; 14-alkaline washing equipment drain pipe; 2-biological purification equipment; 21-biological purification equipment inlet; 22-biological purification equipment outlet; 23-biological purification equipment circulating water tank; 24-biological purification equipment drain pipe; 25-check valve; 3-oxidation washing equipment; 31-oxidation washing equipment inlet; 32-oxidation washing equipment outlet; 33-oxidation washing equipment circulating water tank; 34-oxidation washing equipment drain pipe; 4-fan; 5-exhaust pipe; 6-concentration and reduction module; 60-mixing space; 601-water quality monitor; 61-dosing tank; 62-filtration equipment; 63-membrane concentration equipment; 631-gate valve; 64-water storage space; 65-evaporator; 651-regulating valve; 7-deodorization module. DETAILED DESCRIPTION

[0019] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0020] [Example 1]

[0021] A deodorization system, specifically a water-saving drainage regulation self-balancing deodorization system, such as Figure 1 , including a deodorization module 7 and a concentration and reduction module 6.

[0022] The deodorization module 7 includes an alkaline washing device 1, a biological purification device 2 and an oxidation washing device 3 which are arranged in sequence.

[0023] The alkaline washing equipment 1 is provided with an alkaline washing equipment inlet 11, an alkaline washing equipment outlet 12, an alkaline washing equipment circulating water tank 13 and an alkaline washing equipment drain pipe 14. Malodorous waste gas enters through the alkaline washing equipment inlet 11, and undergoes internal chemical washing to remove some acidic pollutants and water-soluble pollutants in the waste gas. The waste gas then enters the biological purification equipment 2 through the alkaline washing equipment outlet 12.

[0024] The biological purification equipment 2 is provided with a biological purification equipment inlet 21, a biological purification equipment outlet 22, a biological purification equipment circulating water tank 23 and a biological purification equipment drain pipe 24. The biological purification equipment inlet 21 is connected to the alkaline washing equipment outlet 12. The exhaust gas enters the biological purification equipment to remove most of the biodegradable pollutants. The small amount of pollutants remaining at the outlet of the biological purification equipment, including non-biodegradable or insoluble substances, enters the oxidative washing equipment 3 through the alkaline washing equipment outlet 12.

[0025] Preferably, a check valve 25 is installed on the biological purification equipment drain pipe 24 to prevent the drainage of the oxidation washing equipment 3 from entering the biological purification equipment circulating water tank 23 and causing side effects on the biological purification equipment.

[0026] The oxidation washing equipment 3 is provided with an oxidation washing equipment inlet 31, an oxidation washing equipment outlet 32, an oxidation washing equipment circulating water tank 33 and an oxidation washing equipment drain pipe 34. The waste gas enters through the oxidation washing equipment inlet 31 so that the malodorous waste gas is deeply purified, and the deodorized waste gas is discharged through the fan 4 and the exhaust pipe 5.

[0027] As the deodorization equipment operates, each device must discharge circulating water to maintain the good operation of the equipment.

[0028] The wastewater from the oxidative scrubber 3, due to its strong redox properties, often causes problems for downstream wastewater treatment, reducing or even rendering ineffective the biochemical treatment process. Furthermore, to enhance the efficiency of oxidative scrubbing, the pH of the circulating water from the oxidative scrubber is typically adjusted to an alkaline pH, which further complicates water treatment.

[0029] Because most of the microbial metabolites in biological purification equipment 2 are acidic, its wastewater typically has an acidic pH and low redox potential. Therefore, the wastewater from biological purification equipment 2 can be used to neutralize the wastewater from oxidative scrubber 3. However, the wastewater volume of biological purification equipment 2 is relatively large, typically 5 to 10 times that of oxidative scrubber 3 per discharge. Furthermore, since oxidative scrubber 3 is at the very end of the exhaust gas purification process, the pollutant concentration at the equipment inlet is low, and the circulating water replacement cycle is relatively long, making it difficult to achieve a balanced balance between the two wastewater flows.

[0030] As the first purification process, alkaline washing equipment 1 has the highest inlet pollutant concentration, the most frequent circulating water replacement, and its drainage is usually weakly alkaline. It is just right to neutralize the excess drainage of the biological purification equipment by controlling the drainage of the alkaline washing equipment.

[0031] For example: set the drainage volume of biological purification equipment 2 to 5t / d (5t drainage once a day) and the pH to 4; the drainage volume of oxidation washing equipment 3 to 1t / d (1t drainage once a day) and the pH to 10; then the drainage volume of alkaline washing equipment 1 is set to 4t / d (1t drainage four times a day) and the pH to 10.

[0032] Therefore, through the above-mentioned drainage control and the characteristics of drainage from different processes, the drainage from the deodorization equipment is pretreated to achieve neutralization of acid and alkaline drainage, reducing the difficulty of subsequent sewage treatment.

[0033] The concentration and reduction module 6 includes an acid-base adjustment module and a drainage concentration module. The acid-base adjustment module includes a mixing space 60, which is generally a regulating tank. The drainage concentration module includes a membrane concentration device 63; the deodorization module 7 is connected to the mixing space 60 through the alkaline washing equipment drainage pipe 14, the biological purification equipment drainage pipe 24, and the oxidation washing equipment drainage pipe 34, so that the drainage of the deodorization module 7 can be neutralized with acid and alkali in the mixing space 60, which has a pretreatment effect on the drainage and provides support for subsequent drainage to enter the membrane concentration and reduction equipment.

[0034] Furthermore, a water quality monitor is installed in the regulating tank to monitor the pH value, ORP, conductivity, liquid level and other parameters in the regulating tank. A dosing tank 61 is provided next to the regulating tank to add the corresponding type of reagent according to the reading of the water quality monitor.

[0035] The types of reagents added can be (1) alkaline substances, such as NaOH, KOH, etc.; (2) acidic substances, such as HCl, H2SO4, etc.; (3) reducing substances, such as FeSO4, etc.

[0036] Preferably, the pH value of the effluent water parameter is controlled to be 6-6.5 to prevent scaling of the reverse osmosis membrane at the back end; the ORP is <300mV to prevent oxidative drainage from damaging the membrane concentration equipment and back end equipment.

[0037] Optionally, the dosing tank can be set to manually control the addition according to the reading. In other embodiments, the dosing tank can also be set to be electrically connected to the water quality monitor to automatically add drugs through collaborative control of the control system.

[0038] The water from the mixing space 60 passes through the filtering device 62 and then enters the membrane concentration device 63.

[0039] The precision of the filtration equipment is preferably controlled below 10 μm to prevent scaling on the membrane surface and effectively extend the service life of the membrane.

[0040] The membrane concentration equipment concentrates and reduces the wastewater. The membrane system adopts a reverse osmosis system, preferably a butterfly tube reverse osmosis DTRO, which can use single-stage reverse osmosis or multi-stage reverse osmosis.

[0041] The fresh water concentrated by the membrane enters the water storage space 64 for storage. The water storage space 64 is generally a water tank and is reused by the deodorization equipment or other equipment to achieve water-saving effect.

[0042] Preferably, the concentrated water can be discharged to sewage treatment equipment or evaporated through evaporator 65. After the water vapor is condensed, it enters the water storage space 64 for storage or used in other equipment. The evaporation residue is collected and utilized or further processed.

[0043] By building a deodorization equipment wastewater concentration and reduction system, we can reduce or eliminate the deodorization equipment's wastewater volume, minimizing the impact on subsequent sewage treatment equipment. Furthermore, valuable inorganic salts can be recycled and reused to increase the equipment's utility value.

[0044] Under normal circumstances, the recovery rate of membrane concentrated fresh water can reach about 80%, that is, the concentration ratio of the membrane concentration equipment to the deodorization equipment drainage is 5, saving 80% of the drainage volume. In the end, only 20% of the drainage enters the sewage treatment equipment, reducing the impact load on the sewage treatment plant and achieving the effect of reducing drainage volume.

[0045] If there is no sewage treatment equipment nearby, or the factory requires zero wastewater discharge, the regulating valve can be used to switch to evaporator 65, and the evaporated water vapor will be introduced into the water storage tank and reused after condensation; the evaporation residue can be collected and utilized or further processed according to the cleanliness and economy, so as to achieve the effect of zero wastewater discharge.

[0046] [Example 2]

[0047] On the basis of Example 1, the membrane concentration equipment is provided with a bypass system 1, and a gate valve 631 is installed on the bypass system 1 for use during maintenance or troubleshooting of the membrane concentration equipment.

[0048] [Example 3]

[0049] On the basis of embodiment 1 or 2, the evaporator 65 is equipped with a bypass system 2, such as Figure 1 Regulating valves 651 are installed at the evaporator inlet and bypass system 2. Bypass system 2 can not only change the destination of membrane concentrated water during evaporator equipment maintenance or fault repair, but also flexibly adjust the drainage volume discharged to the sewage treatment equipment according to the operating load of the sewage treatment equipment, thereby avoiding the risk of overloading the sewage treatment equipment.

[0050] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A deodorization system, characterized in that: The invention comprises a deodorization module (7) and a concentration and reduction module (6); the deodorization module (7) comprises an alkaline washing device (1), a biological purification device (2) and an oxidation washing device (3); the concentration and reduction module (6) comprises an acid-base adjustment module and a drainage concentration module, the acid-base adjustment module comprises a mixing space (60), and the drainage concentration module comprises a membrane concentration device (63); the deodorization module (7) is connected to the mixing space (60), so that the drainage of the deodorization module (7) can be acid-base neutralized in the mixing space (60); the mixing space (60) is connected to the membrane concentration device (63), and the membrane concentration device (63) concentrates and reduces the drainage.

2. The deodorization system according to claim 1, characterized in that: The acid-base adjustment module further comprises a dosing tank (61) and a water quality monitor (601), wherein the water quality monitor (601) is used to monitor parameters of water in the mixing space (60).

3. The deodorization system according to claim 1 or 2, characterized in that: The drainage concentration module further comprises a water storage space (64), the membrane concentration device (63) is connected to the water storage space (64), and the concentrated fresh water enters the water storage space (64) for storage.

4. The deodorization system according to claim 3, characterized in that: The water storage space (64) is connected to the deodorization module (7).

5. The deodorization system according to claim 3, characterized in that: A check valve (25) is installed on the drainage pipe of the biological purification equipment (2).

6. The deodorization system according to claim 3, characterized in that: The membrane concentration device (63) is provided with a bypass system 1.

7. The deodorization system according to claim 4, characterized in that: The drainage concentration module further includes an evaporator (65), the membrane concentration device (63) is connected to the evaporator (65), and the evaporator (65) is connected to the water storage space (64).

8. The deodorization system according to claim 7, characterized in that: The evaporator (65) is provided with a bypass system 2.

9. The deodorization system according to claim 6, characterized in that: The membrane concentration device (63) adopts a reverse osmosis system, which is a single-stage reverse osmosis or a multi-stage reverse osmosis.

10. The deodorization system according to any one of claims 4 to 9, characterized in that: A filtering device (62) is provided between the mixing space (60) and the membrane concentration device (63).

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