High-salt high-COD (Chemical Oxygen Demand) anaerobic treatment device

Abstract

The invention discloses a high-salt high-COD (Chemical Oxygen Demand) anaerobic treatment device, and belongs to the technical field of wastewater treatment. The device comprises an evaporation unit, a heating unit and a steam utilization unit, the steam utilization unit comprises a first steam pipe, a second steam pipe and a steam power mechanism, the steam power mechanism is located at the top of an evaporation tank, the first steam pipe is connected with the steam power mechanism, and the steam power mechanism is connected with an auger rod. And the second steam pipe is connected with the heating cavity through a pipeline. When high-salt and high-COD wastewater is subjected to evaporative crystallization treatment, the first steam pipe is used as a main steam pipe, and the second steam pipe is used for collecting waste heat or carrying out secondary heat supply on a small part of steam, so that the generated steam is intensively recycled, the evaporative crystallization efficiency is improved, and the treatment energy consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a high-salt and high-COD anaerobic treatment device. Background Art

[0002] High-salt, high-COD wastewater refers to wastewater containing high salt and chemical oxygen demand. This type of wastewater is usually produced in many industrial and production processes, such as salt making, chemical fiber, papermaking and other industries. If this type of wastewater is directly discharged into the water body without treatment, it will cause great harm to the environment, and will also affect the ecosystem and human health.

[0003] After searching, it was found that the utility model patent with announcement number CN214327450U disclosed a high-salt and high-COD wastewater treatment recycling device, which includes a mounting base plate, a mounting plate is arranged on one side of the upper surface of the mounting base plate, and a heating plate is arranged on the inner side of the mounting plate, a heating evaporator is arranged on the inner side of the mounting plate, and a wastewater inlet is arranged on one side of the upper outer surface of the heating evaporator, and a filter screen is arranged on the upper surface of the wastewater inlet, a heating chamber is opened inside the heating evaporator, and a spiral extrusion blade is arranged on one side of the inner side of the heating chamber, an extrusion port is arranged at the lower part of one side of the heating evaporator, and a non-return switch is arranged on the upper outer surface of the extrusion port. The device designed by the utility model can filter out suspended particulate matter in the wastewater through the filter screen of the wastewater inlet when in use, effectively avoiding the blockage of subsequent treatment pipelines by particulate matter. However, the above device does not utilize the generated steam in the process of wastewater treatment, resulting in energy loss, large energy consumption of the device, and low evaporation and crystallization efficiency. Summary of the invention

[0004] 1. Problem to be solved

[0005] In view of the fact that the existing wastewater treatment technology cannot fully utilize the steam in the evaporation and crystallization process, resulting in high treatment energy consumption and low evaporation and crystallization efficiency, the present invention provides a high-salt and high-COD anaerobic treatment device. The device of the present invention includes an evaporation unit, a heating unit and a steam utilization unit, and the steam utilization unit includes a first steam pipe, a second steam pipe and a steam power mechanism, wherein the first steam pipe is used as a main steam pipe, and the second steam pipe is used as a waste heat collection or secondary heating for a small amount of steam, so as to realize intensive steam recovery and utilization and improve the evaporation and crystallization efficiency.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] The high-salt and high-COD anaerobic treatment device of the present invention comprises an evaporation unit, a heating unit and a steam utilization unit, wherein the evaporation unit comprises an evaporation tank and an evaporation chamber, a conveying cylinder is arranged inside the evaporation tank, the conveying cylinder extends from the inner bottom of the evaporation tank to the top of the evaporation tank, and an auger rod is arranged inside the conveying cylinder;

[0009] The heating unit comprises a heater and a heating chamber, the heater is arranged inside the evaporation tank, the heating chamber is located at the bottom of the evaporation tank, and the heater is located outside the evaporation chamber;

[0010] The steam utilization unit includes a first steam pipe, a second steam pipe and a steam power mechanism, the steam power mechanism is located on the top of the evaporation tank, the first steam pipe is connected to the steam power mechanism, the steam power mechanism is connected to the auger rod, and the second steam pipe is connected to the heating chamber through a pipeline.

[0011] Preferably, a vortex tube is provided in the heating chamber, and the second steam pipe is connected to the vortex tube.

[0012] Preferably, the steam power mechanism is provided with a piston rod, a push rod is installed at one end of the piston rod, a connecting rod is installed at one end of the push rod, the top end of the auger rod extends to the top of the conveying cylinder, and the top end of the auger rod is connected to one end of the connecting rod.

[0013] Preferably, a gear ring is installed on the outer surface of the conveying cylinder, a scraper rod is arranged at the bottom of the gear ring, and the side wall of the scraper rod is in contact with the inner wall of the evaporation chamber.

[0014] Preferably, a feed port is provided at the bottom of the conveying cylinder.

[0015] Preferably, a motor is arranged at the top of the outer side of the evaporation tank, a rotating shaft is arranged at the top of the inner side of the evaporation tank, the motor is connected to the rotating shaft, and a gear is arranged at the bottom end of the rotating shaft, and the gear is meshed and connected with a gear ring.

[0016] Preferably, a drain pipe is provided at the bottom of the evaporation tank, the drain pipe is communicated with the conveying cylinder, and a filter plate is provided inside the drain pipe.

[0017] Preferably, a control valve is provided inside the liquid discharge pipe.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) A high-salt and high-COD anaerobic treatment device of the present invention comprises an evaporation unit, a heating unit and a steam utilization unit, wherein the steam utilization unit comprises a first steam pipe, a second steam pipe and a steam power mechanism, and the generated steam is repeatedly utilized when the high-salt and high-COD wastewater is subjected to evaporation and crystallization treatment, thereby realizing intensive steam recycling and improving evaporation and crystallization efficiency;

[0021] (2) A high-salt and high-COD anaerobic treatment device of the present invention, a vortex tube is arranged in the heating chamber, and the second steam pipe is connected to the vortex tube, wherein the diameter of the vortex tube is DN20, and the vortex is arranged in a layered manner, the layers are evenly distributed, and the contact surface is a multi-level maximum circular surface contact, which can maximize the heating efficiency within the effective heating time;

[0022] (3) The high-salt and high-COD anaerobic treatment device of the present invention has a simple structure and a reasonable design. It not only improves the treatment efficiency, but also can realize the secondary utilization of energy and reduce the treatment energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a high-salt and high-COD anaerobic treatment device of the present invention (I);

[0024] Figure 2 A three-dimensional diagram of a high-salt and high-COD anaerobic treatment device of the present invention (II);

[0025] Figure 3 A cross-sectional view of a high-salt and high-COD anaerobic treatment device of the present invention (I);

[0026] Figure 4 This is a cross-sectional view of a high-salt and high-COD anaerobic treatment device of the present invention (II);

[0027] Figure 5 for Figure 1 A local enlarged schematic diagram of point A in the device;

[0028] Figure 6 for Figure 4 A partial enlarged schematic diagram of point B in the device;

[0029] Figure 7 It is a schematic diagram of the structure of a vortex tube in a high-salt and high-COD anaerobic treatment device of the present invention;

[0030] In the figure:

[0031] 101, evaporation tank; 102, evaporation chamber; 1010, conveying cylinder;

[0032] 1011. auger rod; 1012. gear ring; 1013. scraper rod;

[0033] 1014, motor; 1015, shaft; 1016, gear;

[0034] 1017, drain pipe; 1018, filter plate; 1019, control valve;

[0035] 201, heater; 202, heating chamber; 2021, vortex tube;

[0036] 301, first steam pipe; 302, second steam pipe;

[0037] 303, steam power mechanism; 3031, piston rod;

[0038] 3032. Push rod; 3033. Connecting rod. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with specific embodiments.

[0040] like Figure 1-7 As shown, a high-salt and high-COD anaerobic treatment device includes an evaporation unit, a heating unit and a steam utilization unit, wherein the evaporation unit includes an evaporation tank 101 and an evaporation chamber 102, and the evaporation chamber 102 is located inside the evaporation tank 101. A motor 1014 is arranged at the top of the outer side of the evaporation tank 101, and a rotating shaft 1015 is arranged at the top of the inner side of the evaporation tank 101. The motor 1014 is connected to the rotating shaft 1015 to drive the rotation of the rotating shaft 1015. A conveying cylinder 1010 is arranged inside the evaporation tank 101, and the conveying cylinder 1010 passes through the evaporation chamber 102 from the bottom of the inner side of the evaporation tank 101 and extends to the top of the evaporation tank 101. An auger rod 1011 is arranged inside the conveying cylinder 1010, and a gear ring 1012 is installed on the outer surface of the conveying cylinder 1010, and a gear 1016 is arranged at the bottom end of the rotating shaft 1015, and the gear ring 1012 is meshed and connected with the gear 1016. A scraper rod 1013 is provided at the bottom of the gear ring 1012, and the side wall of the scraper rod 1013 contacts the inner wall of the evaporation chamber 102. A drain pipe 1017 is provided at the bottom of the evaporation tank 101, and the drain pipe 1017 is connected to the conveying cylinder 1010, and a filter plate 1018 is provided inside the drain pipe 1017, and a control valve 1019 is provided inside the drain pipe 1017.

[0041] The heating unit includes a heater 201 and a heating chamber 202. The heater 201 is arranged inside the evaporation tank 101, and the heater 201 is located outside the evaporation chamber 102. The heating chamber 202 is located at the bottom of the evaporation tank 101, and a vortex tube 2021 is arranged in the heating chamber 202. The vortex tube has a DN20 circle diameter and is arranged in a circle form. The circles are evenly distributed, and the contact surface is a multi-level maximum circular surface contact, which can maximize the heating efficiency within the effective heating time.

[0042] It should be noted that the steam utilization unit designed in the treatment device of the present invention includes a first steam pipe 301, a second steam pipe 302 and a steam power mechanism 303. The steam power mechanism 303 is located at the top of the evaporation tank 101. The first steam pipe 301 is connected to the steam power mechanism 303. The steam power mechanism 303 is connected to the auger rod 1011. The second steam pipe 302 is connected to the heating chamber 202 through a pipeline. Among them, the first steam pipe 301 is used as the main steam pipe, and the DN25 model is selected to meet the equipment requirements for centralized steam supply. The second steam pipe 302 is used for waste heat collection or secondary heating of a small amount of steam to achieve the role of intensive use of steam. The first steam pipe 301 enters the steam power mechanism 303 (main steam), and the second steam pipe 302 uses the exhaust gas of the steam power mechanism 303 to enter the second steam pipe 302 (auxiliary steam). The first steam pipe 301 and the second steam pipe 302 are used as energy "transfers" for the two types of steam pipes with the help of the steam power mechanism 303. The steam power mechanism 303 is provided with a piston rod 3031, which can reciprocate. A push rod 3032 is installed at one end of the piston rod 3031, and a connecting rod 3033 is installed at one end of the push rod 3032. The top end of the auger rod 1011 extends to the top of the conveying cylinder 1010, and the top end of the auger rod 1011 is connected to one end of the connecting rod 3033.

[0043] The wastewater to be treated can enter the evaporation chamber 102 through the liquid inlet pipe, and the heater 201 heats the wastewater in the evaporation chamber 102, so that the water gradually evaporates and the solute gradually concentrates, forming solid crystals in the evaporation chamber 102. The solid crystals can enter the conveying cylinder 1010 through the feed port set at the bottom of the conveying cylinder 1010, and the steam generated in the evaporation chamber 102 can enter the steam power mechanism 303 through the first steam pipe 301. The steam power mechanism 303 drives the piston rod 3031 to continuously reciprocate, so that the push rod 3032 continuously drives the auger rod 1011 to rotate through the connecting rod 3033. After the auger rod 1011 rotates, it can drive the solid crystals to move upward, so that the solid crystals can be transported out from the discharge pipe of the conveying cylinder. One end of the discharge pipe is connected to the storage box, and the storage box is set to a closed structure to avoid affecting the steam pressure inside the evaporation tank 101.

[0044] On the other hand, a vortex tube 2021 is fixedly installed at the bottom of the inner side of the heating chamber 202, and both ends of the vortex tube 2021 extend to the bottom of the evaporator 101. The outlet end of the steam power mechanism 303 is fixedly connected to the second steam pipe 302, and one end of the second steam pipe 302 is fixedly connected to one end of the vortex tube 2021. The steam discharged from the steam power mechanism 303 can be transported to the inside of the vortex tube 2021 through the second steam pipe 302, and the heat in the steam can heat the heating chamber 202, thereby realizing heat recovery.

[0045] During the evaporation of wastewater, the motor 1014 can be turned on to drive the rotating shaft 1015 to rotate, and the rotating shaft 1015 drives the gear ring 1012 to rotate through the gear 1016. The gear ring 1012 will drive the scraper 1013 to rotate to scrape off the solid crystals attached to the inner wall of the evaporation chamber. A drain pipe 1017 is provided at the bottom of the evaporation tank 101, and a filter plate 1018 fixedly installed on the upper side of the drain pipe 1017 can prevent solid crystals from entering the drain pipe 1017. And when the inside of the evaporation tank 101 is cleaned, the sewage can be discharged through the drain pipe 1017.

[0046] Example 1

[0047] The use of traditional water treatment methods for high-concentration, biodegradable organic wastewater will directly result in low or even impossible COD removal efficiency, while direct incineration will result in high treatment energy consumption and easy secondary pollution, which is neither economical nor environmentally friendly. The high-salt, high-COD anaerobic treatment device of this embodiment is used to treat wastewater by evaporation and crystallization, which not only degrades the COD of organic wastewater, but also combines the advantages of evaporation and crystallization for synergistic treatment.

[0048] In the small-scale experiment, COD value is 1000-2000mg / L, inorganic salt value is less than 10% of organic matter enriched high-concentration salt-containing wastewater, the process of using this device is operated, and salt is produced after combining primary steam and secondary steam (secondary steam). In the small-scale experiment, the final effluent water quality index value table of the high-salt high-COD anaerobic treatment device is shown in Table 1 below.

[0049] Table 1 Numerical table of final effluent water quality indexes of high-salt and high-COD anaerobic treatment device

[0050] Project indicators Index value pH 6.7 COD,mg / L 550 TDS,mg / L 5000 SS / ,mg / L 12 TP,mg / L 0.11

[0051] Example 2

[0052] The high-salt and high-COD anaerobic treatment device of this embodiment is used to carry out evaporation and crystallization treatment of wastewater, and the generated steam is utilized. The specific experimental operation steps and treatment effects are as follows.

[0053] The suspended particles in the wastewater are filtered out by the filter screen at the wastewater inlet, effectively avoiding the blockage of the subsequent treatment pipeline by particles. 20L of wastewater (COD 1000mg / L) enters the evaporation chamber inside the evaporation tank through the liquid inlet pipe, and the steam energy utilization is started (steam temperature 300℃), and the pressure inside the tank is maintained at no more than 2Mpa. After 10 hours of continuous operation, the waste heat steam after the first steam utilization is input into the second steam pipe (auxiliary steam) as the exhaust gas of the steam power mechanism, realizing the secondary utilization of energy and reducing energy consumption.

[0054] The treatment effect of this embodiment is remarkable, producing about 20g of crystals, with a whiteness of 40 degrees and a moisture content of about 50%. Except for the mother liquor (COD 2000mg / L), the COD value of the treated water is 470mg / L.

[0055] Example 3

[0056] The high-salt and high-COD anaerobic treatment device of this embodiment is used to carry out evaporation and crystallization treatment of wastewater, wherein the high-salt and high-COD wastewater is treated by using multiple evaporations, that is, two evaporations of the existing device, to achieve the effect of removing COD and also achieve the purpose of desalting the high-salt wastewater.

[0057] In the small-scale test, after the primary steam enters the device, the remaining heat steam is input into the second steam pipe (auxiliary steam) through the exhaust gas of the steam power mechanism, and the steam temperature of the device is maintained at 300°C. The total reaction time is selected to be no less than 3.5h, which greatly reduces the adverse effect of high COD on the system treatment. The COD removal rate reaches 65%; the salt whiteness value is 40, and the influence of the remaining residual salt on the subsequent biochemical treatment can be ignored, which makes the biochemical wastewater debuggable preparation for the biochemical system downstream of the device.

[0058] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The data used is only one of the implementation methods of the present invention, and the actual data combination is not limited thereto. Therefore, if a person skilled in the art is inspired by it and does not deviate from the purpose of the invention, the implementation methods and embodiments similar to the technical solution without creative design should all fall within the protection scope of the present invention.

Claims

1. A high-salt and high-COD anaerobic treatment device, characterized in that: The invention comprises an evaporation unit, a heating unit and a steam utilization unit, wherein the evaporation unit comprises an evaporation tank (101) and an evaporation chamber (102), a conveying cylinder (1010) is arranged inside the evaporation tank (101), the conveying cylinder (1010) extends from the inner bottom of the evaporation tank (101) to the top of the evaporation tank (101), and an auger rod (1011) is arranged inside the conveying cylinder (1010); The heating unit comprises a heater (201) and a heating chamber (202), the heater (201) is arranged inside the evaporation tank (101), the heating chamber (202) is located at the bottom of the evaporation tank (101), and the heater (201) is located outside the evaporation chamber (102); The steam utilization unit comprises a first steam pipe (301), a second steam pipe (302) and a steam power mechanism (303); the steam power mechanism (303) is located on the top of the evaporation tank (101); the first steam pipe (301) is connected to the steam power mechanism (303); the steam power mechanism (303) is connected to the auger rod (1011); and the second steam pipe (302) is connected to the heating chamber (202) through a pipeline.

2. The high-salt and high-COD anaerobic treatment device according to claim 1, characterized in that: A vortex tube (2021) is provided in the heating chamber (202), and the second steam pipe (302) is connected to the vortex tube (2021).

3. The high-salt and high-COD anaerobic treatment device according to claim 1, characterized in that: The steam power mechanism (303) is provided with a piston rod (3031), one end of the piston rod (3031) is installed with a push rod (3032), one end of the push rod (3032) is installed with a connecting rod (3033), the top end of the auger rod (1011) extends to the top of the conveying cylinder (1010), and the top end of the auger rod (1011) is connected to one end of the connecting rod (3033).

4. The high-salt and high-COD anaerobic treatment device according to claim 1, characterized in that: A toothed ring (1012) is installed on the outer surface of the conveying cylinder (1010), a scraper rod (1013) is arranged at the bottom of the toothed ring (1012), and a side wall of the scraper rod (1013) is in contact with the inner wall of the evaporation chamber (102).

5. The high-salt and high-COD anaerobic treatment device according to claim 1, characterized in that: The bottom of the conveying cylinder (1010) is provided with a feed inlet.

6. The high-salt and high-COD anaerobic treatment device according to claim 1, characterized in that: A motor (1014) is arranged on the top of the outer side of the evaporation tank (101), a rotating shaft (1015) is arranged on the top of the inner side of the evaporation tank (101), the motor (1014) is connected to the rotating shaft (1015), and a gear (1016) is arranged at the bottom end of the rotating shaft (1015), and the gear (1016) is meshedly connected with the gear ring (1012).

7. A high-salt and high-COD anaerobic treatment device according to any one of claims 1 to 6, characterized in that: A liquid drain pipe (1017) is provided at the bottom of the evaporation tank (101), the liquid drain pipe (1017) is connected to the conveying cylinder (1010), and a filter plate (1018) is provided inside the liquid drain pipe (1017).

8. The high-salt and high-COD anaerobic treatment device according to claim 7, characterized in that: A control valve (1019) is provided inside the liquid discharge pipe (1017).

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