A wastewater treatment device

Abstract

This invention discloses a wastewater treatment device, which includes a multi-stage dissolved air system, a quinone reaction system, a defoaming system, and an aeration system. The systems are coupled together, have a compact structure, reduce the equipment footprint, and provide good water treatment effect.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, and more specifically, relates to a wastewater treatment device. Background Technology

[0002] Wastewater characterized by high COD, high phenol content, and high biotoxicity is difficult to treat, especially the phenolic substances it contains. Semi-coke wastewater is a typical example of this type of wastewater.

[0003] Semi-coke wastewater is a difficult-to-treat industrial wastewater generated during semi-coke production, characterized by high oil content, acidity, ammonia, phenol content, and high biotoxicity. The treatment of phenols is a key focus and challenge, as phenolic compounds are easily oxidized, producing complex products. Polyphenols are even more easily oxidized, yielding quinone compounds. Therefore, oxidation is a targeted treatment method. Phenolic substances can be removed by precipitating out quinones after oxidation (hereinafter referred to as quinoneization reaction). However, existing general water treatment equipment faces the following problems in treating semi-coke wastewater:

[0004] The problem of excessive foam generation during the oxidation process is difficult to solve, affecting subsequent processing.

[0005] Low oxidation efficiency and poor water treatment effect;

[0006] The process equipment has high energy consumption, large footprint, and limited application value. Summary of the Invention

[0007] 1. The problem to be solved

[0008] In view of the problem that existing devices for treating wastewater with high phenol content have unsatisfactory application effects, the purpose of this invention is to provide a wastewater treatment device;

[0009] The wastewater treatment device is particularly suitable for treating semi-coke wastewater.

[0010] 2. Technical Solution

[0011] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0012] This invention provides a wastewater treatment device, comprising:

[0013] A multi-stage dissolved gas system, wherein the multi-stage dissolved gas system includes a low-pressure dissolved gas system and a high-pressure dissolved gas system;

[0014] A quinone reaction system, wherein the quinone reaction system is equipped with a disperser and a baffle-type gas-gathering plate;

[0015] Defoaming system, wherein the defoaming system is disposed above the quinone reaction system;

[0016] Aeration system;

[0017] The effluent from the multi-stage dissolved air system is fed into the quinone reaction system, and the effluent from the quinone reaction system is fed into the aeration system.

[0018] With the direction of water flow within the quinoline reaction system as the upper part, the defoaming system is located at the upper part of the quinoline reaction system;

[0019] The disperser is located at the bottom of the quinone reaction system, and the baffle-type gas-gathering plate is located at the top of the disperser;

[0020] in,

[0021] The disperser includes a central tube and a conduit;

[0022] The central pipe includes an inlet end and an outlet end. The inlet end is connected to a multi-stage dissolved air system, and the outlet end is connected to a conduit.

[0023] The conduit includes an inlet and a distribution port. The inlet is connected to the outlet, and the distribution port is a funnel-shaped distribution port.

[0024] The baffle-type aeration plate is a segmented baffle plate, and the spacing of the baffle-type aeration plate gradually increases from the water inlet side to the water outlet side. The minimum spacing of the baffle-type aeration plate is ≥25mm, and the maximum spacing of the baffle-type aeration plate is ≤50mm.

[0025] Furthermore, the wastewater treatment equipment also includes a gas treatment system, which is connected to the quinone reaction system.

[0026] Furthermore, the quinone reaction system also includes a cylindrical body, and the disperser and baffle-type gas-gathering plate are disposed inside the cylindrical body;

[0027] Furthermore, the defoaming system includes a hydraulic defoamer and a spraying system;

[0028] The spraying system is located on the upper part of the cylinder;

[0029] The defoamer is positioned between the spray system and the baffle plate.

[0030] Furthermore, the aeration system includes an aeration tank two, which includes an aeration pipe, a sedimentation zone, an aeration zone, and a permeable plate disposed between the sedimentation zone and the aeration zone.

[0031] The aeration pipe is located in the aeration zone.

[0032] Furthermore, the second aeration tank also includes an inlet, a sedimentation zone outlet, and an aeration zone outlet;

[0033] The water inlet is located in the sedimentation zone.

[0034] Furthermore, the second aeration tank also includes a grid plate, which is disposed between the permeable plate and the aeration zone.

[0035] Furthermore, the aeration system also includes an aeration tank, which includes an inlet and an outlet.

[0036] The inlet of the aeration tank is connected to the quinone reaction system;

[0037] The outlet of aeration tank one is connected to aeration tank two.

[0038] The inlet end of aeration tank 1 is considered the front end, and the outlet end of aeration tank 1 is considered the rear end.

[0039] The aeration rate in the aeration tank decreases from the front end to the back end.

[0040] Furthermore, the height-to-diameter ratio of the cylinder is generally in the range of 1.5-2.5, which can be calculated using empirical formulas:

[0041]

[0042] In the formula:

[0043] H is the height of the cylinder;

[0044] D is the diameter of the cylinder;

[0045] C represents the average COD (mg / L) of the influent;

[0046] T is the average inlet water temperature (°C);

[0047] Q is the average influent flow rate (m³ / s). 3 / h);

[0048] k is an empirical constant;

[0049] ε is a correction parameter, with a value range of -0.5 to 0.5.

[0050] Furthermore, the height of the baffle-type gas-gathering plate is 0.5-0.6 times the height of the quinone reactor cylinder.

[0051] 3. Beneficial effects

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] (1) Based on the principle of quinone reaction, this invention proposes an integrated wastewater treatment device, which is equipped with a multi-stage dissolved air system, a quinone reaction system, a segmented defoaming system, a gas treatment system, a graded aeration system, etc. The systems are coupled to each other, the structure is compact, and the equipment footprint can be reduced. The device achieves wastewater treatment based on the principle of quinone reaction.

[0054] (3) The integrated wastewater treatment equipment provided by the present invention has a multi-stage dissolved air system that combines low-pressure dissolved air and high-pressure dissolved air, thereby maximizing energy consumption reduction while ensuring dissolved air effect.

[0055] (4) The integrated wastewater treatment equipment provided by the present invention has a quinolation reaction system that is an upflow quinolation reaction system, which can continuously perform quinolation reaction on semi-coke wastewater.

[0056] Furthermore, the disperser in the quinone reaction system effectively prevents clogging and ensures uniform water distribution.

[0057] Its baffle-type air-gathering plate can efficiently gather tiny bubbles.

[0058] (5) The integrated wastewater treatment equipment provided by the present invention has a defoaming system consisting of a hydraulic defoaming unit and a spraying system, which can specifically solve the problem of a large amount of foam generated in the process of quinone reaction of semi-coke wastewater.

[0059] (6) The integrated wastewater treatment equipment provided by the present invention uses an aeration system to further treat the effluent from the quinone reactor, and can deaerate and deeply oxidize it to enhance the phenol removal effect.

[0060] The aeration system is a graded aeration system containing two aeration tanks. Aeration tank one uses gradually decreasing aeration to ensure deaeration while reducing energy consumption. Aeration tank two combines shallow aeration and sedimentation, enabling the separation of water by quality, reducing siltation, and facilitating subsequent treatment.

[0061] (7) The integrated wastewater treatment equipment provided by the present invention can achieve continuous flow operation, rather than intermittent operation. For wastewater of this type, especially wastewater such as semi-coke wastewater after quinone treatment, the flocs produced have high density and are easy to accumulate and adhere. Maintaining continuous flow operation can effectively prevent the problem of sludge accumulation in a static state. Attached Figure Description

[0062] Figure 1 A schematic diagram of the overall structure of the integrated wastewater treatment equipment provided by the present invention;

[0063] Figure 2 A schematic diagram (top view) of the overall structure of the integrated wastewater treatment equipment provided by the present invention;

[0064] Figure 3A schematic diagram of the disperser in the integrated wastewater treatment device provided by the present invention;

[0065] Figure 4 A partially enlarged view of the disperser in the integrated wastewater treatment device provided by the present invention;

[0066] Figure 5 A schematic diagram of the structure of the aeration tank 2 of the integrated wastewater treatment equipment provided by the present invention;

[0067] Figure 6 A process flow diagram for water treatment using the wastewater treatment equipment provided by this invention;

[0068] Figure 7 A process flow diagram for water treatment using the wastewater treatment equipment provided by this invention;

[0069] Figure 8 This is a schematic diagram illustrating the principle of water treatment using the wastewater treatment equipment provided by the present invention. Detailed Implementation

[0070] The present invention will be further described below with reference to specific embodiments.

[0071] (1) Basic Principles

[0072] like Figures 6-8 As shown, this process unit is an integrated design, mainly composed of a multi-stage dissolved air system 100, a quinone reaction system 200, a defoaming system 300, a gas treatment system 500, and an aeration system 400. It utilizes the principle of oxidizing phenolic substances into quinone substances by air (quinone reaction principle) to treat wastewater with high phenol content and high biological toxicity, such as semi-coke wastewater. The following explanation will use semi-coke wastewater as an example.

[0073] During operation, the semi-coke wastewater is first pressurized and dissolved in a multi-stage dissolved air system 100, and then released in a quinone reaction system 200 via a disperser 210. At this time, the pressure decreases, and the dissolved gas in the water forms a large number of tiny bubbles. The phenolic substances in the semi-coke wastewater react fully with the oxygen in the tiny bubbles, are oxidized to form quinone substances, and loose flocculent substances are formed and precipitated.

[0074] The quinone reaction system 200 operates in an upflow mode, where the liquid flow, microbubbles, and flocs are propelled and continuously rise, overflowing after reaching a certain height. During the upward flow, the liquid passes through multi-stage aeration plates, where bubbles collide and aggregate under the deflection effect of the aeration plates, forming large bubbles, effectively reducing the number of bubbles in the effluent and facilitating subsequent treatment.

[0075] During the quinone reaction, semi-coke wastewater is prone to generating a large amount of foam. The quinone reaction system 200 is equipped with a defoaming system 300 at the top. The defoaming system 300 effectively controls foam through the combined action of a layered hydraulic defoaming unit and a spray system.

[0076] The gas generated by the quinone reaction system 200 is collected in the gas treatment system 500 and discharged after two stages of gas washing: water washing and alkali washing.

[0077] After undergoing the quinone reaction, the semi-coke wastewater enters the aeration system 400, which serves to deaerate and deeply oxidize the wastewater. Aeration removes residual gases from the semi-coke wastewater while simultaneously oxidizing it, further enhancing the quinone reaction efficiency.

[0078] The device is equipped with a reflux system. The effluent from the quinone reaction system (200 ppm) and the aeration system (400 ppm) is refluxed back to the front end of the device to mix with the raw water. This can homogenize the water quality, reduce foam generation, and improve the treatment effect of the device.

[0079] (2) Description of the structure and function of the main components of the integrated device (see...) Figures 1-5 )

[0080] Multi-stage dissolved gas system 100:

[0081] The multi-stage dissolved air system 100 is divided into two sections: a low-pressure dissolved air system 120 and a high-pressure dissolved air system 110. Low-pressure dissolved air can be achieved using a dissolved air pump, while high-pressure dissolved air can be achieved using a dissolved air tank. Low-pressure dissolved air dissolves air into the influent of the device with lower energy consumption and a larger flow rate, while high-pressure dissolved air utilizes higher pressure to improve the dissolved air effect. The coupling of these two systems to form a multi-stage dissolved air system results in lower energy consumption and better dissolved air performance. In detail:

[0082] 001. The multi-stage dissolved air system 100 includes a low-pressure dissolved air system 120 and a high-pressure dissolved air system 110. The low-pressure dissolved air system 120 uses a dissolved air pump to dissolve air in the raw water, and the high-pressure dissolved air system 110 uses a dissolved air tank to dissolve air in the raw water after low-pressure dissolved air. The two stages are connected by a pipeline.

[0083] 002. The dissolved air pump used in the low-pressure dissolved air system 120 has a head range of 40-50m.

[0084] 003. The material of the flow-through part of the dissolved air pump used in the low-pressure dissolved air system 120 is resistant to corrosion from semi-coke wastewater.

[0085] 004. The high-pressure dissolved gas system 110 uses two or more dissolved gas tanks connected in parallel.

[0086] 005. The high-pressure dissolved air system 110 uses several dissolved air tanks, each with its own automatic valve that independently controls the water inlet and outlet. When some dissolved air tanks are in the dissolved air or water outlet state, it does not affect the water inlet of other dissolved air tanks.

[0087] 006. The dissolved gas system 110 uses a hollow dissolved gas tank made of stainless steel, with an inner lining resistant to corrosion from coke wastewater. It is supplied with air by an air compressor, and the dissolved gas working pressure is 0.45-0.55MPa.

[0088] 007. The dissolved gas system 110 uses a horizontal dissolved gas tank with a residence time of 4-5 minutes.

[0089] Quinonization reaction system 200:

[0090] The quinone reaction system 200 is the main part of the equipment. This system operates in an upflow manner and mainly consists of a disperser 210, a baffle-type aeration plate 220, and a cylinder 230, and is coupled to the defoaming system 300. After being dissolved in air by the multi-stage dissolved air system 100, the raw water is released into the cylinder 230 via the disperser 210. Inside the cylinder 230, the pressure of the raw water decreases, releasing a large number of microbubbles. These microbubbles oxidize phenolic substances while simultaneously providing buoyancy to the flocs, preventing them from settling at the bottom of the cylinder 230. In detail:

[0091] 001. The quinone reaction system 200 is a one-piece structure, with all components installed inside the cylinder 230. The cylinder 230 is a one-piece manufactured sealed structure, internally housing the disperser 210 and the baffle-type gas-gathering plate 220. The cylinder 230 is equipped with several water inlet and outlet ports, vent ports, etc. The cylinder also has installation points for the segmented defoaming system 300, and provides a gas outlet.

[0092] 002. The 230 cylinder material has good strength, and the 230 cylinder lining has good corrosion resistance, capable of withstanding the corrosion of semi-coke wastewater. For example, carbon steel can be used, with fiberglass lining for corrosion protection.

[0093] 003. The cylinder 230 is cylindrical with a conical bottom. The wastewater retention time is approximately 1 hour.

[0094] 004. The height-to-diameter ratio of the 230mm cylinder is generally in the range of 1.5-2.5, and can be calculated using empirical formulas:

[0095]

[0096] In the formula,

[0097] H is the height of the cylinder, 230.

[0098] D is the diameter of the cylinder, which is 230 mm.

[0099] C represents the average COD (mg / L) of the influent;

[0100] T is the average inlet water temperature (°C);

[0101] Q is the average influent flow rate (m³ / s). 3 / h);

[0102] k is an empirical constant, typically taken as 0.2;

[0103] ε is a correction parameter, with a value range of -0.5 to 0.5;

[0104] The value was determined based on experience, taking into account factors such as the usage environment, test results, and water quality characteristics.

[0105] 005. For example Figure 1 As shown, the direction from A to B represents the flow direction of water within the quinone reaction system 200, with B being the upper part and A the lower part. The quinone reaction system 200 uses dispersers 210 evenly distributed at the bottom of the device for water distribution. Figure 3 , 4 As shown, the water distributor 210 includes a central pipe 211 and a conduit 212;

[0106] The central pipe 211 includes an inlet end 211a and an outlet end 211b. The inlet end 211a is connected to the multi-stage dissolved air system 100.

[0107] The water outlet 211b is connected to the conduit 212;

[0108] The conduit includes an inlet 212a and a distribution port 212b. The inlet 212a is connected to the outlet 211b.

[0109] Mouth 212b is a funnel-shaped water distribution nozzle;

[0110] 006. The disperser 210 is arranged along a circumference on a plane. The plane where the disperser 210 is located is 0.2-0.5m above the bottom of the tank, and the height of the water inlet reserved in the cylinder 230 is consistent with the installation height of the disperser 210.

[0111] 007. The quinone reaction system 200 has a baffle plate 220 in the middle to gather microbubbles and make them collide with each other to form large bubbles.

[0112] 008. The baffle plate 220 used in the quinone reaction system 200 has a denser baffle plate on one side near the bottom of the cylinder 230 and a sparser baffle plate on the other side. The material is resistant to corrosion by semi-coke wastewater.

[0113] 009. The height of the baffle plate 220 is 0.5-0.6 times the height of the cylinder 230 of the quinone reaction system 200, and the installation method inside the cylinder 230 is welding.

[0114] 010. The outlet height of the quinone reaction system 200 is 0.1-0.2m above the aeration plate.

[0115] 011. The quinone reaction system 200 cylinder 230 has a reserved installation point for the defoamer 320, which is 0.1-0.2m above the baffle plate 220.

[0116] 012. The quinone reaction system 200 has an exhaust gas outlet inside the cylinder 230, which is located at the top of the cylinder 230. The cylinder 230 is sealed with a cover.

[0117] Defoaming System 300:

[0118] The defoaming system 300 includes a hydraulic defoamer 320 and a spraying system 310;

[0119] 001. The number of hydraulic defoamers 320 is 4-8, arranged in a ring with equal spacing on the same plane.

[0120] 002. The motor used in the 320 hydraulic defoamer is waterproof.

[0121] 003. The installation method of the hydraulic defoamer 320 in the cylinder 230 of the quinone reaction system 200 is welding.

[0122] 004. The spray system 310 uses the device to produce water and uses a booster pump to supply water. The spray pipes are laid on the upper part of the cylinder 230 of the quinone reaction system 200.

[0123] 005. The number of sprinkler heads in the 310 sprinkler system is 8-16, arranged in a ring with equal spacing on the same plane.

[0124] Gas Handling System 500:

[0125] The gas treatment system 500 is mainly used to treat the waste gas from the quinone reaction system 200. The gas treatment system of the quinone reaction system 200 is a multi-stage gas scrubbing tower, employing a two-stage scrubbing tower series of water scrubbing and alkaline scrubbing, which can specifically treat ammonia, hydrogen sulfide, etc., in the exhaust gas. In detail:

[0126] 001. The exhaust gas mainly comes from the quinone reaction system 200, which is powered by an induced draft fan. It is first treated by a water scrubbing tower and then by an alkaline scrubbing tower before being discharged.

[0127] 002. The air volume of the induced draft fan is 10-30m³. 3 Between / h.

[0128] 003. The washing water can be returned to the inlet of the device to homogenize the water quality.

[0129] Aeration System 400:

[0130] The aeration system 400 is a staged aeration system used to further treat the effluent from the quinone reaction system 200. It consists of two connected aeration tanks with different aeration structures inside, and its function is deaeration and deep oxidation. In detail:

[0131] 001. The aeration system 400 consists of two aeration tanks connected in series, namely aeration tank one and aeration tank two, with independent aeration pipes for each. The retention time of wastewater in the aeration system 400 is 1 hour.

[0132] 002. Both aeration tank one and aeration tank two use Roots blowers with aeration hoses for aeration.

[0133] 003. One side of aeration tank receives the effluent from the quinone reaction system 200, with an aeration volume of 10-15 m³ / h. 3 Gradual aeration is adopted. The air volume at the front end of the tank is relatively large, which has a good stirring and degassing effect, and can further oxidize the wastewater at the same time; the air volume at the rear end is reduced, which reduces stirring, saves energy, facilitates the dissipation of bubbles, and can control the amount of foam generated for subsequent treatment in aeration tank 2.

[0134] 004. An inlet 413 is provided on one side of aeration tank two, and the inlet 413 is connected to aeration tank one. The partition or wall at the connection point is only partially installed at the top, with the bottom remaining open. Aeration air volume is 5-10 m³ / h. 3 It mainly involves oxidation, with small aeration volume and minimal hydraulic agitation.

[0135] 005. For example Figure 5 As shown, aeration tank two serves both shallow aeration and sedimentation functions. A horizontally installed grid plate 422 divides aeration tank two into upper and lower sections. The lower section is the sedimentation zone 410, primarily for sedimentation, and a permeable plate 411 (or inclined plate, or inclined tube) is installed to enhance the sedimentation effect. The inlet 413 is located in the sedimentation zone 410. The upper section is the aeration zone 420, primarily for aeration.

[0136] The semi-coke wastewater after quinone reaction contains a large amount of heavy flocs, which are prone to siltation and adhesion. Aeration disturbs the flocs to a certain extent, keeping the water flow in motion. This sacrifices some of the sedimentation effect, reduces floc accumulation, and enhances sludge removal.

[0137] 006. The second aeration tank is equipped with two outlets, namely the aeration zone outlet 413 at the end of the aeration zone 420 and the sedimentation zone outlet 412 at the end of the sedimentation zone 410. The effluent from the aeration zone 420 is the final effluent from the integrated semi-coke wastewater treatment device, while the effluent from the sedimentation zone 410 contains a large amount of flocs and sludge, which is beneficial for resource recovery.

[0138] 007. The bottom of the second aeration tank has a slope of 2‰ to 3‰ along the direction of water flow.

[0139] Reflux:

[0140] This integrated wastewater treatment equipment features a reflux system with an adjustable reflux ratio from 0% to 100%. Water from the effluent outlets of the quinone reaction system 200 and the aeration system 400 is refluxed back to the inlet of the integrated equipment, powered by a reflux pump, operating intermittently. The purpose of the reflux is to homogenize the water quality and facilitate the continuous and stable operation of the quinone reaction system 200.

[0141] Example 1

[0142] In this embodiment, an integrated wastewater treatment equipment is used to treat high-concentration semi-coke wastewater with a COD of over 30,000 mg / L and a phenol content of over 4,000 mg / L. The designed inflow rate is 20 t / h.

[0143] Its multi-stage dissolved air system 100 is equipped with a low-pressure dissolved air pump as the low-pressure dissolved air system 120, with a flow rate of 30m³ / h. 3 / h, two high-pressure dissolved gas tanks are set as high-pressure dissolved gas system 110, with a working pressure of 0.5MPa; the residence time in the multi-stage dissolved gas system 100 is 4min.

[0144] Based on empirical values, the inner diameter D of the quinone reactor is taken as 2.5m, and the height-to-diameter ratio is calculated using an empirical formula as follows:

[0145]

[0146] The height of the cylinder 230 of the quinone reaction system 200 is 6.06m, so the height H = 6m is taken. The water distributor 210 is 0.2m above the bottom of the cylinder, and the distributor 210 is arranged in a ring with 6 funnel-shaped water outlets 212b. Four defoamers 320 are installed on the upper part of the cylinder 230 of the quinone reaction system 200, and eight spray nozzles are used as a spray system 310 to remove foam.

[0147] The spacing between the inlet side 220a of the baffle-type air-gathering plates inside the cylinder 230 is 25mm, and the spacing between the outlet side 220b of the baffle-type air-gathering plates is 50mm.

[0148] The upper part of the cylinder 230 is equipped with an exhaust port connected to the gas treatment system 500. The exhaust gas in the quinone reaction system 200 is introduced into the gas treatment system 500 by an induced draft fan and treated by a two-stage gas scrubbing tower consisting of water washing and alkaline washing.

[0149] The overflow effluent from the quinone reaction system 200 is sent to aeration tank 1, with an aeration rate of 15m³. 3 After a gradual reduction of aeration, impurities are removed until the final aeration rate is 10m³ / h. 3 / h. Gravity flow to aeration tank two, aeration volume 5m³ / h. 3The wastewater is treated in the aeration tank at a rate of / h, and then discharged separately. The effluent is returned to the front end via a return pump. Because this wastewater is difficult to treat, the return flow needs to be increased, and the return ratio is set to 100%.

[0150] Table 1. Water quality before and after treatment

[0151] Water quality indicators (mg / L) COD (mg / L) Phenolic compounds (mg / L) Before processing 35000 15000 After processing 11000 3800 Removal rate 70％ 75％

[0152] Comparative Example 1

[0153] This comparative example is basically the same as Example 1, and the wastewater treated is the same as in Example 1. The only difference is that the dissolved air system used is not a multi-stage dissolved air system 100, but only a dissolved air pump (head 30-50m) or only a dissolved air tank (pressure 0.35-0.5Mpa) is selected.

[0154] Table 2. Results of semi-coke wastewater treatment

[0155] COD removal rate Phenolic removal rate Continuous operation Energy consumption Dissolved gas pump 45-55％ 50-60％ yes middle Dissolved gas tank 50-60％ 55-65％ no high

[0156] Based on this comparative example, it can be seen that the integrated wastewater treatment equipment in Example 1, which uses a multi-stage dissolved air system, can produce better water treatment results while having lower energy consumption.

[0157] In continuous water treatment operation, the multi-stage dissolved air system 100 of the present invention saves 8-10% energy compared to dissolved air pumps or dissolved air tanks, and the output water is stable.

[0158] Compared to Example 1, the decrease in removal rate in this comparative example is due to insufficient gas dissolving capacity and insufficient oxygen in the subsequent oxidation reaction.

[0159] Comparative Example 2

[0160] This comparative example is basically the same as Example 1, except that the diffuser 210 used is different, and is a single perforated tube.

[0161] Table 3. Water quality before and after treatment

[0162]

[0163] 1. Average cleaning cycle (characterizing the ease with which the disperser becomes clogged):

[0164] The disperser 210 used in Example 1 has an average cleaning cycle of more than 90 days;

[0165] The single perforated tube used in Comparative Example 2: average cleaning cycle within 7 days;

[0166] 2. The reason for the decrease in removal rate is that the liquid flow is not sufficiently dispersed, resulting in incomplete oxidation reaction.

[0167] Comparative Example 3

[0168] This comparative example is basically the same as Example 1, except that the baffle-type aeration plate 220 used is different. In this comparative example, the spacing of the baffle-type aeration plate 220 from the water inlet side 220a to the water outlet side 220b is the same.

[0169] The reason for the decrease in removal rate is that the aeration plate has low efficiency and the agglomeration effect of bubbles and flocs is not good.

[0170] Table 4. Water quality before and after treatment

[0171] COD Phenols Before processing 35000 15000 After processing 16000 6000 Removal rate 55％ 60％

[0172] Comparative Example 4

[0173] This comparative example is basically the same as Example 1, except that: the overflow water from the quinone reaction system 200 is sent to aeration tank 1, and aeration tank 1 does not use a gradual aeration treatment; its aeration rate is always maintained at 15m³. 3 / m 2 / h, flowing by gravity to aeration tank two, the aeration rate remains no less than 15m³ / h of the aeration rate in aeration tank one. 3 / m 2 / h.

[0174] Compared with the control group, the energy consumption of the aeration system increases by 12-15% due to the increase in aeration volume.

[0175] Table 5. Water quality before and after treatment

[0176]

[0177]

[0178] The quality of the effluent has declined, and the reasons for this decline are:

[0179] (1) In the gradually decreasing aeration mode, aeration tank one is conducive to the aggregation of flocs at the end and a smooth transition to aeration tank two. In this comparative example, aeration tank one always maintains a high aeration rate, which hinders the stability of flocs, is not conducive to the cooperation with aeration tank two, and weakens the treatment effect.

[0180] (2) In this comparative example, the aeration tank 2 maintains a large aeration volume, which causes violent agitation of the water body, destroys the design of stratified and graded water discharge, and makes the water quality of the effluent worse.

[0181] Comparative Example 5

[0182] This comparative example is basically the same as Example 1, except that the aeration tank 2 in the aeration system 400 used is different and is a common horizontal flow aeration tank.

[0183] Table 6. Water quality before and after treatment

[0184] COD Phenols Before processing 35000 15000 After processing 14000 5300 Removal rate 60％ 65％

[0185] 1. Compared to the aeration system 400 in Example 1, the water treatment effect of a conventional horizontal flow aeration tank is worse.

[0186] 2. Semi-coke wastewater is prone to producing sludge. Therefore, the equipment in this comparative example is prone to sludge accumulation and adhesion at the bottom of the pool during the treatment of semi-coke wastewater, which can cause blockage of the aeration pipe.

[0187] 3. Compared with Example 1, the semi-coke wastewater treated by the equipment in this comparative example has significantly more suspended matter in its effluent.

Claims

1. A wastewater treatment device, characterized in that, The device includes: A multi-stage dissolved gas system (100) includes a low-pressure dissolved gas system (120) and a high-pressure dissolved gas system (110). Quinogenization reaction system (200), wherein the quinogenization reaction system (200) is provided with a disperser (210) and a baffle plate (220); A defoaming system (300) is disposed above the quinone reaction system (200); Aeration system (400); The effluent from the multi-stage dissolved air system (100) is fed into the quinone reaction system (200), and the effluent from the quinone reaction system (200) is fed into the aeration system (400). With the direction of water flow within the quinoline reaction system (200) as the upper part, the defoaming system (300) is located at the upper part of the quinoline reaction system (200); The disperser is located at the lower part of the quinone reaction system (200), and the baffle-type gas-gathering plate (220) is located at the upper part of the disperser (210); in, The disperser (210) includes a central tube (211) and a conduit (212); The central tube (211) includes an inlet end (211a) and an outlet end (211b). The inlet end (211a) is connected to the multi-stage dissolved air system (100), and the outlet end (211b) is connected to the conduit (212). The conduit includes an inlet (212a) and a distribution port (212b). The inlet (212a) is connected to the outlet (211b), and the distribution port (212b) is a funnel-shaped distribution port. The baffle-type aeration plate (220) is a segmented baffle plate, and the spacing of the baffle-type aeration plate (220) gradually increases from the water inlet side (220a) to the water outlet side (220b).

2. The wastewater treatment equipment according to claim 1, characterized in that, It also includes a gas processing system (500) connected to the quinone reaction system (200).

3. The wastewater treatment equipment according to claim 1, characterized in that, The quinone reaction system (200) also includes a cylinder (230), and the disperser (210) and the baffle-type gas-gathering plate (220) are disposed inside the cylinder (230).

4. The wastewater treatment equipment according to claim 3, characterized in that, The defoaming system (300) includes a defoamer (320) and a spraying system (310); The spray system (310) is located on the upper part of the cylinder (230); The defoamer (320) is located between the spray system (310) and the baffle plate (220).

5. The wastewater treatment equipment according to claim 1, characterized in that, The aeration system (400) includes an aeration tank 2, which includes an aeration pipe (421), a sedimentation zone (410), an aeration zone (420), and a permeable plate (411) disposed between the sedimentation zone (410) and the aeration zone (420). The aeration pipe (421) is located in the aeration zone (420).

6. The wastewater treatment equipment according to claim 5, characterized in that, The second aeration tank also includes an inlet (413), a sedimentation zone outlet (412), and an aeration zone outlet (423). The inlet (413) is located in the sedimentation zone (410).

7. The wastewater treatment equipment according to claim 5, characterized in that, The second aeration tank also includes a grid plate (422), which is disposed between the permeable plate (411) and the aeration zone (420).

8. The wastewater treatment equipment according to claim 5, characterized in that, The aeration system (400) also includes an aeration tank, which includes an inlet and an outlet. The inlet of the aeration tank is connected to the quinone reaction system (200); The outlet of aeration tank one is connected to aeration tank two. The inlet end of aeration tank 1 is considered the front end, and the outlet end of aeration tank 1 is considered the rear end. The aeration rate in the aeration tank decreases from the front end to the back end.

9. The wastewater treatment equipment according to any one of claims 1 to 8, characterized in that, The height-to-diameter ratio of the cylinder (230) is generally in the range of 1.5-2.5, and can be calculated using empirical formulas: In the formula: H is the height of the cylinder (230); D is the diameter of the cylinder (230); C represents the average COD of the influent (mg / L). T is the average inlet water temperature (°C); Q is the average influent flow rate (m³ / s). 3 / h); k is an empirical constant; ε is a correction parameter, with a value range of -0.5 to 0.

5.

10. The wastewater treatment equipment according to claim 9, characterized in that, The height of the baffle-type gas-gathering plate (220) is 0.5-0.6 times the height of the cylinder (230) of the quinone reaction system (200).

Images