Odor treatment system for sewage treatment air flotation equipment

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a peculiar smell treatment system for sewage treatment air flotation equipment. Comprising an air floatation tank, a peculiar smell cover is arranged at the top of the air floatation tank, air supplementing openings are formed in the two sides of the peculiar smell cover, an exhaust hole is formed in the top of the peculiar smell cover and connected with one end of a peculiar smell line, and the other end of the peculiar smell line is sequentially connected with an induced draft fan, an alkaline washing tower, a water washing tower, a demister and an RTO. Through sealing of the peculiar smell cover and intelligent air supplement adjustment, it is ensured that peculiar smell gas is effectively collected, micro-negative pressure is maintained, overflowing is strictly prevented, and the environment is protected; and alkali washing, water washing, demisting and RTO treatment processes are combined, so that the gas is comprehensively purified, and up-to-standard emission is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to an odor treatment system for sewage treatment air flotation equipment. Background Art

[0002] In the petrochemical industry, wastewater treatment is an indispensable and important part of the production process. However, with the expansion of production scale and the complexity of wastewater properties, the VOCs (volatile organic compounds) odor control problem faced by wastewater treatment plants is becoming increasingly severe. In particular, flotation equipment, as one of the key equipment in the sewage treatment process, will release VOCs containing malodorous gases such as hydrogen sulfide when its flotation tank treats sewage and waste oil. If these gases are not effectively treated, they will not only harm the health of operators, but also have a serious impact on the surrounding environment, resulting in failure to meet environmental protection requirements.

[0003] The traditional method of odor control of flotation equipment mainly relies on the simple covering and sealing of the flotation tank with a fiberglass cover (i.e., odor cover). However, this method has obvious drawbacks: on the one hand, with the increase in the amount of sewage and oil treatment, the odor concentration in the odor cover rises sharply, and long-term accumulation causes odor to be emitted around the equipment, making it difficult to meet environmental emission standards; on the other hand, the sealing effect of the odor cover is limited, especially when the equipment is running, due to pressure fluctuations and gas diffusion, odors can easily escape from the gaps, causing environmental pollution. Therefore, the development of an efficient, stable, and intelligent odor treatment system for sewage treatment flotation equipment has become an urgent need to solve the current problem of VOCs odor control in wastewater treatment plants of petrochemical plants. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide an odor treatment system for sewage treatment flotation equipment, which ensures the effective collection of odorous gases and maintains a micro-negative pressure through odor hood closure and intelligent air supply adjustment to prevent overflow and protect the environment; combined with alkaline washing, water washing, demisting and RTO treatment processes, the gas is fully purified to ensure that emissions meet standards.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The odor treatment system for sewage treatment flotation equipment comprises a flotation tank, an odor hood is arranged on the top of the flotation tank, air supply ports are arranged on both sides of the odor hood, an exhaust hole is arranged on the top of the odor hood, the exhaust hole is connected to one end of the odor line, and the other end of the odor line is connected to an induced draft fan, an alkali washing tower, a water washing tower, a demister and an RTO in sequence.

[0007] A VOC sensor and a pressure sensor are also provided inside the air flotation tank.

[0008] The air supply port is provided with an air supply valve.

[0009] The described caustic scrubber and water scrubber are respectively connected with a circulation pipeline, and a circulation pump is provided on the circulation pipeline.

[0010] It further includes a standby induced draft fan, and the induced draft fan and the standby induced draft fan are both equipped with variable frequency controllers.

[0011] It further includes a control system, and the control system is electrically connected to the VOC sensor, the pressure sensor, the make-up air valve, the circulation pump and the variable frequency controller respectively.

[0012] The working principle of the present utility model is as follows:

[0013] For the odor treatment system of the sewage treatment flotation equipment described in the present utility model, the odor hood at the top of the flotation tank effectively seals and collects the odor gases in the flotation water tank area and the water outlet area, and the regulation of the make-up air port and the make-up air valve is used to maintain the air circulation and slightly negative pressure environment in the hood. The collected odor gases are transmitted to the induced draft fan through the odor pipeline. Under the regulation of the variable frequency controller, the induced draft fan provides power for the gas transmission and sends it into the caustic scrubber for neutralization treatment of acidic pollutants. Subsequently, the treated gas enters the water scrubber to further wash and remove the residual alkali droplets, and after removing the droplets through the demister, it is finally sent to the RTO for high-temperature incineration treatment, completely decomposed into harmless substances, and achieving environmental protection up-to-standard discharge. According to the VOC sensor and the pressure sensor inside the flotation tank, the odor concentration and pressure changes are monitored in real time, and the data is transmitted to the control system. The control system automatically adjusts the opening degree of the make-up air valve, the rotation speed of the induced draft fan and the working state of the circulation pump according to the monitored data to ensure the treatment effect.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] (1) For the odor treatment system of the sewage treatment flotation equipment described in the present utility model, through the effective sealing of the odor hood and the intelligent regulation of the make-up air port, the efficient collection of the odor gases in the flotation tank and the stable maintenance of the slightly negative pressure environment are realized, effectively preventing the overflow of the odor gases and ensuring the air quality of the surrounding environment;

[0016] (2) For the odor treatment system of the sewage treatment flotation equipment described in the present utility model, the combined treatment process of the caustic scrubber, the water scrubber, the demister and the RTO is adopted, which can completely remove the acidic pollutants and other harmful substances in the odor gases, ensure that the treated gas meets the environmental protection emission standards, and realize the comprehensive treatment of the odor gases generated in the sewage treatment process;

[0017] (3) The odor treatment system for sewage treatment air flotation equipment described in the present utility model can, by being equipped with an intelligent control system, monitor in real time and automatically adjust the working states of various treatment units, improve the treatment efficiency and stability, reduce the need for manual intervention, and achieve automated and intelligent operation management. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the odor treatment system for sewage treatment air flotation equipment described in the present utility model;

[0019] In the figure: 1, air flotation tank; 2, odor hood; 3, air supply opening; 4, exhaust hole; 5, odor pipeline; 6, induced draft fan; 7, alkali scrubber; 8, water scrubber; 9, demister; 10, RTO; 11, VOC sensor; 12, pressure sensor; 13, air supply valve; 14, circulation pipeline; 15, circulation pump; 16, standby induced draft fan. Detailed Embodiments

[0020] In order to make the purpose and technical solutions of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Embodiment 1

[0022] As Figure 1 shown, the odor treatment system for sewage treatment air flotation equipment described includes an air flotation tank 1, an odor hood 2 is provided at the top of the air flotation tank 1, air supply openings 3 are provided on both sides of the odor hood 2, an exhaust hole 4 is provided at the top of the odor hood 2, one end of the exhaust hole 4 is connected to one end of an odor pipeline 5, and the other end of the odor pipeline 5 is successively connected to an induced draft fan 6, an alkali scrubber 7, a water scrubber 8, a demister 9, and an RTO 10.

[0023] A VOC sensor 11 and a pressure sensor 12 are further provided inside the air flotation tank 1.

[0024] An air supply valve 13 is provided at the air supply opening 3.

[0025] The alkali scrubber 7 and the water scrubber 8 are respectively connected to a circulation pipeline 14, and a circulation pump 15 is provided on the circulation pipeline 14.

[0026] It further includes a standby induced draft fan 16, and frequency conversion controllers are equipped for both the induced draft fan 6 and the standby induced draft fan 16.

[0027] It further includes a control system, and the control system is electrically connected to the VOC sensor 11, the pressure sensor 12, the air supply valve 13, the circulation pump 15, and the frequency conversion controller respectively.

[0028] During operation, the specific process is as follows:

[0029] 1) Monitoring and startup:

[0030] The VOC concentration in the air flotation tank 1 is continuously monitored by the VOC sensor 11. When the monitored VOC concentration reaches the preset threshold, the induced draft fan 6 is started through the control system. Under the regulation of the frequency conversion controller, the induced draft fan 6 starts to operate at the set speed to provide power for gas transmission. When the main induced draft fan 6 fails, the standby induced draft fan 16 can be quickly started and take over the work to ensure that the entire odor treatment system can operate continuously and without interruption.

[0031] 2) Pressure regulation and air make-up:

[0032] At the same time, the pressure sensor 12 monitors the pressure change in the odor hood 2 above the air flotation tank 1. The control system automatically adjusts the opening degree of the air make-up valve 13 according to the data of the pressure sensor 12, and at the same time changes the speed of the induced draft fan 6 by adjusting the frequency of the frequency conversion controller to maintain the air circulation in the odor hood 2 and a slightly negative pressure environment of -2 kPa to prevent the leakage of odor gas.

[0033] 3) Gas transmission and treatment:

[0034] Under the action of the induced draft fan 6, the odor gas is transmitted to the alkali scrubber 7 through the odor line 5. In the alkali scrubber 7, the gas makes reverse contact with the alkali liquor provided by the circulation pump 15, and through spraying and neutralization reactions, the acidic pollutants in the gas are effectively removed.

[0035] At this stage, the control system will also adjust the working state of the circulation pump 15 according to the speed of the induced draft fan 6 and the treatment effect in the alkali scrubber 7.

[0036] The gas after alkali scrubbing treatment enters the water scrubber 8 to further wash and remove the residual alkali liquor droplets. The circulation pump 15 in the water scrubber 8 also works under the regulation of the control system to ensure that the washing effect reaches the best.

[0037] Subsequently, the gas passes through the demister 9 to remove the droplets, enters the RTO 10 for high-temperature incineration treatment, and is finally decomposed into harmless substances and discharged.

[0038] 4) Continuous monitoring and optimization:

[0039] During the whole treatment process, the VOC sensor 11 and the pressure sensor 12 work continuously and transmit the data to the control system.

[0040] The control system adjusts the working states of devices such as the induced draft fan 6, the air make-up valve 13, and the circulation pump 15 in real time according to the real-time data to ensure the high efficiency and stability of the treatment effect.

Claims

1. An odor treatment system for a sewage treatment air flotation device, characterized in that, It includes an air flotation tank (1), an odor hood (2) is provided at the top of the air flotation tank (1), air supply inlets (3) are provided on both sides of the odor hood (2), an exhaust hole (4) is provided at the top of the odor hood (2), one end of the exhaust hole (4) is connected to one end of an odor line (5), and the other end of the odor line (5) is successively connected to a draft fan (6), an alkali scrubber (7), a water scrubber (8), a demister (9) and an RTO (10).

2. The odor treatment system for the sewage treatment air flotation equipment according to claim 1, wherein, A VOC sensor (11) and a pressure sensor (12) are further provided inside the air flotation tank (1).

3. The odor treatment system for the sewage treatment air flotation equipment according to claim 2, characterized in that, An air supply valve (13) is provided at the air supply inlet (3).

4. The odor treatment system for the sewage treatment air flotation equipment according to claim 3, characterized in that, The alkali scrubber (7) and the water scrubber (8) are respectively connected to a circulation pipeline (14), and a circulation pump (15) is provided on the circulation pipeline (14).

5. The odor treatment system for the sewage treatment air flotation equipment according to claim 4, characterized in that, It further includes a standby draft fan (16), and the draft fan (6) and the standby draft fan (16) are both equipped with variable frequency controllers.

6. The odor treatment system for the sewage treatment air flotation equipment according to claim 5, characterized in that, It further includes a control system, and the control system is electrically connected to the VOC sensor (11), the pressure sensor (12), the air supply valve (13), the circulation pump (15) and the variable frequency controller respectively.

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