Coking wastewater advanced treatment device

Abstract

The utility model discloses an advanced treatment device for coking wastewater, which belongs to the technical field of environment-friendly water treatment and comprises a water inlet tank, a pressurized dissolved air pump, an ozone regulating valve, an ozone generator, an ozone reaction device, a micro-nano aerator, an ozone concentration monitor, a reflux valve, a water outlet valve, a water inlet valve, an aeration valve and a monitoring valve. According to the utility model, the ozone gas dissolving technology and the aeration technology are innovatively combined together, so that the ozone utilization rate is remarkably improved from 60% to 100%, the ozone can fully react with the coking wastewater after biochemical treatment, the removal ratio of the ozone to COD (Chemical Oxygen Demand) can reach 1: 1, residual ozone tail gas is not generated, the COD and chromaticity of organic matters in the coking wastewater are reduced, and the coking wastewater treatment efficiency is improved. And better pretreatment is provided for subsequent recycling, so that the method has good environment-friendly and economic benefits.

Description

Technical Field

[0001] The utility model relates to a coking wastewater deep treatment device, belonging to the technical field of environmental protection water treatment. Background Art

[0002] After biochemical treatment, domestic coking wastewater, such as chemical oxygen demand (COD) and color, often fails to meet the primary wastewater discharge standard (GB8978-1996). However, with the development of society, environmental protection requirements are becoming increasingly stringent, and coking wastewater standards are also being raised (GB16171-2012), necessitating advanced treatment of coking wastewater. Ozone has strong oxidizing properties, and its use in wastewater treatment can simultaneously remove COD and color from coking wastewater, eliminating secondary pollution. Therefore, ozone is often used in advanced wastewater treatment processes for industrial wastewater.

[0003] Direct ozone oxidation for wastewater treatment presents certain technical challenges, such as short ozone mass transfer distances and low utilization rates. Conventional ozone aeration methods have short ozone mass transfer distances and utilization rates of only 40% to 60%, generating significant amounts of ozone tail gas that require absorption or destruction. Ozone itself has an oxidation-reduction potential of approximately 2.07V, but under certain conditions, it can also generate hydroxyl radicals, which have a redox potential as high as 2.3 to 2.8V and are more oxidizing. Therefore, improving ozone oxidation efficiency requires extending the mass transfer reaction time of ozone in water, increasing ozone utilization, and boosting hydroxyl radical production.

[0004] Chinese utility model patent publication number CN215479974 U discloses an ozone catalytic oxidation device that utilizes a catalyst filler to improve ozone utilization and free radical generation. However, the catalyst filler is prone to damage and contamination during use, and replacing the catalyst significantly increases costs, affecting practical application results. Furthermore, the ozone is dissolved using a micro-nano aeration disk. However, due to the pressure of the ozone generator's exhaust, the amount of dissolved ozone is generally limited. Excess exhaust gas eventually overflows, resulting in waste and requiring an ozone destructor to remove any residual ozone.

[0005] In order to solve the problems of ozone dissolution efficiency, ozone reaction efficiency and residual ozone tail gas, a wastewater deep treatment device and method that improves ozone oxidation utilization efficiency is designed and developed, which has great practical application significance. Summary of the Invention

[0006] The purpose of the utility model is to provide a coking wastewater deep treatment device. Through the device of the utility model, the ozone utilization rate can be significantly improved, and the ozone can fully react with the wastewater without generating residual ozone tail gas, thereby removing the organic matter COD and chroma in the coking wastewater, meeting the discharge standards, or providing better pretreatment for subsequent reuse, with good environmental and economic benefits.

[0007] The utility model device is realized by the following technical solutions:

[0008] A coking wastewater deep treatment device is characterized by comprising: a water inlet tank, a pressurized dissolved air pump, an ozone regulating valve, an ozone generator, an ozone reaction device, a micro-nano aerator, an ozone concentration monitor, a reflux valve, a water outlet valve, a water inlet valve, an aeration valve and a monitoring valve; the water outlet of the water inlet tank is connected to one end of the pressurized dissolved air pump through a pipeline and the water inlet valve, the other end of the pressurized dissolved air pump is connected to the ozone generator through the ozone regulating valve, the other end of the pressurized dissolved air pump is connected to the micro-nano aerator in the ozone reaction device through the aeration valve, the micro-nano aerator is installed at the bottom of the ozone reaction device, the upper part of the ozone reaction device is provided with a water outlet, the water outlet is provided with a water outlet pipe, the water outlet pipe is provided with a water outlet valve and is connected to the water inlet tank through the reflux valve, the top of the ozone reaction device is provided with an exhaust port and an exhaust pipe, the exhaust pipe is provided with a monitoring valve and is connected to the ozone concentration monitor.

[0009] Preferably, the ozone reaction device is made of organic glass, stainless steel or carbon steel lined with rubber for corrosion protection (glass fiber reinforced plastic, PTFE).

[0010] Preferably, the height-to-diameter ratio of the ozone reaction device is 5-10.

[0011] Preferably, the ozone reaction device is cylindrical with a diameter of 0.6-1.5m, and a DN15-DN25 exhaust pipe port on the top, with water and ozone entering from the bottom and water discharging from the top, and exhaust from the top central pipe.

[0012] Preferably, the flow rate in the ozone reactor device is 3-5 m / h, and the ozone reaction residence time (HRT) in the ozone reaction device is 1-3 hours.

[0013] Preferably, the ozone generator is an air-type ozone generator.

[0014] Preferably, the micro-nano aerator is threadedly connected, the molding material of the micro-nano aerator is ozone-resistant PTFE, the interior of the micro-nano aerator is a multi-faceted cavity, and the micro-nano aerator 6 is laid with one or more aeration heads at the bottom according to the amount of water to be processed, and each aeration head processes 300-500L / h of water on average.

[0015] Preferably, the micro-nano aerator is installed at a height of 200-300 mm from the bottom of the ozone reaction device, and the outlet is horizontal at 0 degrees / 180 degrees to discharge a steam-water mixture.

[0016] Beneficial effects:

[0017] 1. Through the configuration and processing of the dissolved air pump and the micron aeration head, micro-nano ozone bubbles can be formed, which prolongs the residence time of ozone in the water. 2. Through the dissolved air pump instead of the mixer, the ozone is better mixed with the coking wastewater and fully reacts with the organic pollutants therein, reducing and removing the COD in the water. 3. The ozone utilization rate is improved. After the reaction, there is no ozone tail gas at the outlet, the ozone is 100% completely reacted, and the O3:COD addition and removal ratio is increased from 3:1 to 1:1, which significantly improves the ozone efficiency. 4. No chemicals are added to the wastewater, and there is no catalyst filler, etc., so the treatment of coking wastewater is environmentally friendly and additive-free. 5. The system configuration is simple and can be operated continuously and intermittently, which facilitates flexible management.

[0018] The following is a further description of the present invention through the accompanying drawings and specific implementation examples, but the implementation of the present invention is not limited thereto. It should be understood that the embodiments described in this specification are only for the purpose of explaining the utility model and are not intended to limit the present utility model patent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the coking wastewater deep treatment device of Example 1 of the present utility model.

[0020] Description of main reference numerals:

[0021] 1 Water inlet tank 2 Pressurized air dissolving pump

[0022] 3 ozone regulating valve 4 ozone generator

[0023] 5Ozone reaction device 6Micro-nano aerator

[0024] 7 Ozone concentration monitor 8 Reflux valve

[0025] 9 water outlet valve 10 water inlet valve

[0026] 11 Aeration valve 12 Monitoring valve DETAILED DESCRIPTION

[0027] Unless otherwise specified, the components in the following embodiments of the present invention are all conventional components obtained from the market; the connections between the components are all conventional connections; the raw materials used are all conventional raw materials obtained from the market, and the concentrations are all in weight units.

[0028] Example 1

[0029] like Figure 1 , which is a schematic structural diagram of a coking wastewater deep treatment device according to Example 1 of the present utility model, wherein 1 is a water inlet tank, 2 is a pressurized dissolved air pump, 3 is an ozone regulating valve, 4 is an ozone generator, 5 is an ozone reaction device, 6 is a micro-nano aerator, 7 is an ozone concentration monitor, 8 is a reflux valve, 9 is a water outlet valve, 10 is a water inlet valve, 11 is an aeration valve, and 12 is a monitoring valve;

[0030] The coking wastewater deep treatment device of embodiment 1 of the present invention comprises a water inlet tank 1, a pressurized dissolved air pump 2, an ozone regulating valve 3, an ozone generator 4, an ozone reaction device 5, a micro-nano aerator 6, an ozone concentration monitor 7, a reflux valve 8, a water outlet valve 9, a water inlet valve 10, an aeration valve 11 and a monitoring valve 12; the water outlet of the water inlet tank 1 is connected to one end of the pressurized dissolved air pump 2 through a pipeline and the water inlet valve 10, and the other end of the pressurized dissolved air pump 2 is connected to the ozone generator 4 through the ozone regulating valve 3. The other end of the pressurized dissolved air pump 2 is connected to the micro-nano aerator 6 in the ozone reaction device 5 through an aeration valve 11. The micro-nano aerator 6 is installed at the bottom of the ozone reaction device 5. The upper part of the ozone reaction device 5 is provided with a water outlet, and the water outlet is provided with a water outlet pipe. The water outlet pipe is provided with a water outlet valve 9 and is connected to the water inlet tank 1 through a reflux valve. The top of the ozone reaction device 5 is provided with an exhaust port and an exhaust pipe. The exhaust pipe is provided with a monitoring valve 12 and is connected to the ozone concentration monitor 7;

[0031] The material of the ozone reaction device 5 can be organic glass, stainless steel or carbon steel lined with rubber for corrosion protection (glass fiber reinforced plastic, PTFE);

[0032] The height-to-diameter ratio of the ozone reaction device 5 is 5-10;

[0033] The ozone reaction device 5 is designed for an ozone reaction residence time (HRT) of 1-3 hours. It has a cylindrical structure with a diameter of 0.6-1.5m, with water and ozone entering from the bottom and water exiting from the top. The exhaust is through a central pipe at the top. The top is designed with a DN15-DN25 exhaust pipe outlet. The flow rate within the ozone reactor device is 3-5m / h. This allows for better reaction and removal of organic matter in the water, while fully utilizing the ozone. The O3:COD addition and removal ratio is 1:1.

[0034] The ozone generator 4 is an air-type ozone generator, and the concentration of ozone in the outlet gas is 100-150 mg / L;

[0035] The micro-nano aerator 6 is threadedly connected. The molding material of the micro-nano aerator 6 is ozone-resistant PTFE. The interior of the micro-nano aerator is a multifaceted cavity. After being pressed out by the pressurized dissolved air pump 2, a micro-nano air-water mixture is formed. The micro-nano aerator 6 is provided with at least one aeration head, or multiple (3-6) aeration heads. Each aeration head can process 300-500L / h of water.

[0036] The installation height of the micro-nano aerator 6 is 200-300 mm from the bottom of the ozone reaction device 5, and the outlet is horizontal 0 degrees / 180 degrees, and the gas-water mixture is discharged;

[0037] The water outlet of the ozone reaction device 5 is designed to be a pipeline for reflux water to the water inlet tank 1, which is provided with a reflux valve 8 and a water outlet valve 9 for intermittent circulation reaction to remove more pollutants in the water.

[0038] The operation process of the coking wastewater deep treatment device of Example 1 of the present utility model is as follows:

[0039] (1) The coking wastewater after biochemical treatment enters the water inlet tank 1. The bottom of the water inlet tank 1 is connected to the pressurized air dissolving pump 2 through a pipeline and an inlet valve 10. The pressurized air dissolving pump 2 is provided with an ozone inlet. The other end of the pressurized air dissolving pump 2 is connected to the ozone generator 4 through an ozone regulating valve 3. Ozone is sucked into the pump body of the pressurized air dissolving pump 2 through the ozone inlet, and is fully mixed and pressurized to form microbubbles.

[0040] (2) The microbubbles enter the micro-nano aerator 6 at the bottom of the ozone reaction device 5, and are formed into uniform micro-nano bubbles by the micro-nano aerator 6. The decolorization oxidation reaction is carried out in the ozone reaction device 5 to remove COD in the water.

[0041] In step (1), the ozone generator is provided with an outlet regulating valve to appropriately adjust the ozone content entering the water so as to better react with organic matter and color substances in the water; and the gas volume is preferably controlled at 15% of the water flow rate, that is, the gas-water ratio is 0.08-0.15, which can more stably absorb and mix the ozone;

[0042] In step (1), the ozone reaction residence time (HRT) in the ozone reaction device 5 is 1-3 hours;

[0043] In step (1), the concentration of ozone in the outlet gas of the ozone generator 4 is 100-150 mg / L;

[0044] In step (1), each aeration head can process 300-500 L / h of water.

[0045] The coking wastewater deep treatment device of Example 1 of the present invention controls and adjusts the gas output of the ozone generator through an ozone concentration monitor, and monitors the complete reaction of ozone in the reaction device to prevent ozone waste and air pollution.

[0046] The coking wastewater deep treatment device of Example 1 of the present invention forms micro-nano bubbles through a pressurized dissolved air pump 2 + micro-nano aerator 6, making the gas-water form milky white, and reacting with organic matter in the water, oxidizing the coking wastewater after the front-end biochemical treatment from red to colorless, so that the inlet CODcr80-100mg / L is reduced to within 60mg / L, meeting the standard requirements.

[0047] Application Example 1

[0048] In a coking plant's wastewater deep treatment workshop, the front-end wastewater undergoes a two-stage anaerobic + aerobic biochemical treatment process, then flows out of the secondary sedimentation tank and the multi-media filter, enters the water inlet tank 1, and then is mixed with ozone by a pressurized dissolved air pump 2. It then enters the ozone reaction device 5 through a micro-nano aerator 6. The residence time is 2.5 hours, and a total of 60 mg / L of ozone is added to the water. The color is completely removed, the CODcr also decreases significantly, the added ozone reacts completely, and the ozone utilization rate is 100%.

[0049] Table 1

[0050]

[0051] The coking wastewater deep treatment device of the utility model can significantly improve the ozone utilization rate from 60% to 100% by innovatively combining ozone dissolution and aeration technologies and newly designing an ozone reaction device, and can enable ozone to fully react with the coking wastewater after biochemical treatment. The ozone and COD removal ratio can reach 1:1, and no residual ozone tail gas is generated. The organic matter COD and chroma in the coking wastewater are reduced and removed, and the discharge meets the standard and provides better pretreatment for subsequent reuse, which has good environmental and economic benefits.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coking wastewater deep treatment device, characterized by: The invention comprises an inlet water tank, a pressurized dissolved air pump, an ozone regulating valve, an ozone generator, an ozone reaction device, a micro-nano aerator, an ozone concentration monitor, a reflux valve, a water outlet valve, a water inlet valve, an aeration valve and a monitoring valve; the water outlet of the inlet water tank is connected to one end of the pressurized dissolved air pump through a pipeline and the water inlet valve, the other end of the pressurized dissolved air pump is connected to the ozone generator through the ozone regulating valve, the other end of the pressurized dissolved air pump is connected to the micro-nano aerator in the ozone reaction device through the aeration valve, the micro-nano aerator is installed at the bottom of the ozone reaction device, the upper part of the ozone reaction device is provided with a water outlet, the water outlet is provided with a water outlet pipe, the water outlet pipe is provided with a water outlet valve and is connected to the inlet water tank through the reflux valve, the top of the ozone reaction device is provided with an exhaust port and an exhaust pipe, the exhaust pipe is provided with a monitoring valve and is connected to the ozone concentration monitor.

2. The coking wastewater deep treatment device according to claim 1, characterized in that: The ozone reaction device is made of organic glass, stainless steel or carbon steel lined with rubber for corrosion resistance.

3. The coking wastewater deep treatment device according to claim 2, characterized in that: The height-to-diameter ratio of the ozone reaction device is 5-10.

4. The coking wastewater deep treatment device according to claim 3, characterized in that: The ozone reaction device is cylindrical with a diameter of 0.6-1.5m.

5. The coking wastewater deep treatment device according to claim 4, characterized in that: The top of the ozone reaction device adopts a DN15-DN25 exhaust pipe outlet.

6. The coking wastewater deep treatment device according to claim 5, characterized in that: The ozone generator is an air-type ozone generator.

7. The coking wastewater deep treatment device according to claim 6, characterized in that: The micro-nano aerator is connected by threaded connection. The molding material of the micro-nano aerator is ozone-resistant PTFE. The interior of the micro-nano aerator is a multi-faceted cavity.

8. The coking wastewater deep treatment device according to claim 7, characterized in that: The micro-nano aerator is provided with one or more aeration heads, and each aeration head processes 300-500 L / h of water.

9. The coking wastewater deep treatment device according to claim 8, characterized in that: The micro-nano aerator is installed at a height of 200-300 mm from the bottom of the ozone reaction device.

10. The coking wastewater deep treatment device according to claim 9, characterized in that: The outlet of the micro-nano aerator is horizontal 0 degree / 180 degrees.

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