High-COD (Chemical Oxygen Demand) organic wastewater treatment system

Abstract

The utility model relates to a high COD (Chemical Oxygen Demand) organic wastewater treatment system which comprises a biological oxidation tank, the biological oxidation tank comprises an inner cylinder body and a jacket cylinder body arranged outside the inner cylinder body, a water inlet is formed in the lower part of the jacket cylinder body, and a water outlet is formed in the upper part of the jacket cylinder body; a first discharge port is formed in the bottom of the inner cylinder body, an air inlet, a sampling port and a plurality of detection ports are formed in the side wall of the inner cylinder body, an upper flange cover is detachably and fixedly arranged at the top of the inner cylinder body, and an exhaust port, an inoculation port and a plurality of material supplementing ports are formed in the upper flange cover; the air inlet is connected with an aeration disc positioned at the bottom of the barrel body of the inner barrel through a breather pipe; and a stirring mechanism is arranged in the middle of the inner cylinder body. The high-COD organic wastewater treatment system is high in COD removal treatment efficiency, high in impact resistance, good in biodegradability, low in cost and small in investment, and has obvious environmental benefits and wide application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic wastewater treatment technical field, concretely relates to a high COD organic wastewater treatment system. BACKGROUND

[0002] The activated sludge method is a commonly used treatment method for treating organic wastewater by using the suspended growth microbial population, and the COD, ammonia nitrogen (ammonia nitrogen refers to the nitrogen in the water in the form of free ammonia and ammonium ions) and phosphorus pollutants in the wastewater are converted into stable harmless substances through the metabolism of microorganisms. The conventional activated sludge method process usually uses a biochemical pool, and there is an upper limit requirement for the pollutant content when treating organic wastewater, usually requiring COD≤10000mg / L, ammonia nitrogen content less than 500mg / L, and phosphorus content less than 50mg / L (the specific limit value will be different due to different treatment processes and wastewater quality, but there will be no big difference), if the COD, ammonia nitrogen and phosphorus content of the wastewater to be treated significantly exceeds the upper limit of the treatment range, it will cause a great impact on the microbial population in the activated sludge, and even cause the treatment system to be paralyzed; in addition, the conventional activated sludge treatment process requires a long time and has a limited pollutant degradation range, such as the aerobic treatment process which requires the wastewater to stay for 24-72h, so that the influent COD can be reduced from 1000-3000mg / L to about 300-500mg / L, and then discharged into the sewage treatment plant for further treatment, if the COD exceeds the load, the effluent exceeds the standard, it is difficult to meet the requirement of timely treatment of a large amount of high-pollution wastewater.

[0003] Due to the above limitations, when treating high-COD, high-pollutant and biochemical wastewater (such as fermentation and food industry production wastewater), the activated sludge method cannot be directly used for treatment, and it is necessary to first treat by coagulation sedimentation, oxidation treatment or filtration adsorption, and then perform activated sludge biological oxidation, which not only increases the treatment cost, but also may introduce new pollution and increase the difficulty of wastewater treatment. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a high-COD organic wastewater treatment system with high COD removal treatment efficiency, strong impact resistance, good biochemical property, low cost and small investment.

[0005] To solve the above problems, the technical scheme adopted by the utility model is:

[0006] The utility model provides a kind of high COD organic wastewater treatment system, it includes biological oxidation tank, the biological oxidation tank includes inner cylinder barrel and the jacket barrel being arranged outside inner cylinder barrel, the lower part of jacket barrel is provided with water inlet, and the upper part is provided with water outlet;The bottom of inner cylinder barrel is provided with first discharge port, and the sidewall is provided with air inlet, sampling port and several detection ports, and the top of inner cylinder barrel is detachably fixed with upper flange cover, and the upper flange cover is provided with exhaust port, inoculation port and several feeding ports;The air inlet is connected with aeration disc located at the bottom of inner cylinder barrel by air pipe;The middle part of inner cylinder barrel is provided with stirring mechanism.

[0007] As an embodiment of the utility model, the lower end of the inner cylinder barrel is provided with a barrel head, and the lower end of the jacket barrel is provided with a jacket head;The sampling port and the detection port are located at the lower part of the inner cylinder barrel and pass through the sidewall of the jacket barrel.

[0008] As an embodiment of the utility model, the detection port is provided with three, which are arranged on the left side of the inner cylinder barrel and are respectively a PH port, a DO port and a temperature measuring port;The sampling port is arranged on the right side of the inner cylinder barrel.

[0009] As an embodiment of the utility model, the air inlet is arranged at the upper sidewall of the inner cylinder barrel, and the first discharge port is arranged at the center of the bottom of the inner cylinder barrel;A side mirror is vertically arranged on the sidewall of the inner cylinder barrel along the up-down direction.

[0010] As an embodiment of the utility model, the stirring mechanism includes a stirring motor fixedly arranged at the center above the upper flange cover and a stirring shaft vertically arranged at the center inside the inner cylinder barrel, and the stirring shaft is coaxially connected with the output shaft of the stirring motor.

[0011] The stirring mechanism further includes a baffle vertically fixedly arranged on the inner wall of the inner cylinder barrel, the baffle is arranged along the radial direction of the inner cylinder barrel in the width direction, and the baffle is uniformly provided with a plurality of circumferential arrangements along the inner wall of the inner cylinder barrel.

[0012] As an embodiment of the utility model, it further includes a catalytic oxidation reaction tank, and the wastewater treated by the biological oxidation tank enters the catalytic oxidation reaction tank for catalytic oxidation treatment.

[0013] The catalytic oxidation reaction tank includes a barrel, a support ring is fixedly arranged on the lower part of the barrel, and a plurality of rib plates are fixedly arranged between the support ring and the inner wall of the barrel in a circumferential direction.

[0014] The lower end of the barrel is provided with a feeding pipe, and the upper end is provided with a second discharging port; the top of the barrel is provided with a safety valve port, an air inlet valve port and a pressure gauge port; and a thermometer port and a manhole are arranged on the side wall of the lower part of the barrel.

[0015] As an embodiment of the utility model, the support grid plate is assembled together by a connecting bolt and is located in the middle of the connecting part and the first arc part and the second arc part on both sides of the connecting part; the pressing plate comprises two parallel pressing strips which are detachably connected together by a connecting bolt and a connecting plate, and the connecting plate is fixed on the inner wall of the barrel.

[0016] As an embodiment of the utility model, a plurality of annular retaining rings are horizontally fixed on the upper part of the barrel; and an annular heat preservation ring is fixed on the upper end and the lower end of the outer wall of the barrel.

[0017] As an embodiment of the utility model, the lower end of the barrel is provided with a lower head, and the upper end is provided with an upper head; a skirt assembly is arranged below the barrel; a cylinder section is fixed on the upper part of the skirt assembly through a connecting flange; the barrel is fixed on the upper end of the cylinder section; a plurality of skirt exhaust pipes are arranged on the side wall of the cylinder section; and a skirt inspection hole is arranged on the skirt assembly.

[0018] As an embodiment of the utility model, one end of the feeding pipe is connected to the center of the lower head, and the other end is arranged on the side wall of the skirt assembly; a vortex prevention mechanism is arranged in the lower head and connected to the feeding pipe; the vortex prevention mechanism comprises a circular vortex prevention baffle and a vortex prevention rib plate which is fixed below the vortex prevention baffle in a cross shape; and the vortex prevention rib plate is fixed on the feeding port of the lower head which is connected to the feeding pipe.

[0019] The above technical solution has the following beneficial effects:

[0020] The high-COD organic wastewater treatment system provided by the utility model adds two feeding ports on the upper flange cover of the biological oxidation tank for adding ammonia nitrogen and phosphorus; under the condition of air being introduced and a certain pressure and temperature being maintained, the content ratio of C, N and P in the wastewater is controlled, the dissolved oxygen of the wastewater is improved, the utilization rate of oxygen of the microorganisms in the activated sludge is improved, the metabolic rate is improved, the activated sludge is rapidly proliferated, the high-COD wastewater is efficiently treated, the high-COD wastewater is reduced to a low level in a short time, and the wastewater with COD exceeding 10,000 has a significant advantage. The wastewater treatment system has high COD removal and treatment efficiency, strong impact resistance, low cost, small investment, obvious environmental benefits and wide application prospect.

[0021] In order to make wastewater to reach the discharge standard, after completing biological oxidation treatment through the biological oxidation tank, the effluent is filtered, heated and then enters the catalytic oxidation reaction tank, with hydrogen peroxide as the oxidant and the filler as the oxidation catalyst, through LDO low-temperature wet catalytic oxidation treatment, the reaction time is 30-60 min, so that the COD content in the wastewater reaches the discharge standard, and the discharged liquid is cooled through the heat exchanger and then discharged to the industrial wastewater treatment pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the main view structural schematic diagram of the biological oxidation tank in the utility model.

[0023] Figure 2 is the top view structural schematic diagram of the biological oxidation tank in the utility model.

[0024] Figure 3 is the main view structural schematic diagram of the catalytic oxidation reaction tank in the utility model.

[0025] Figure 4 is the top view structural schematic diagram of the catalytic oxidation reaction tank in the utility model. Figure 3

[0026] Figure 5 is the main view structural schematic diagram of the support grid plate in the utility model.

[0027] Figure 6 is the top view structural schematic diagram of the support grid plate in the utility model.

[0028] Figure 7 is the top view structural schematic diagram of the support grid plate in the utility model.

[0029] Figure 8 is the main view structural schematic diagram of the pressing plate in the utility model.

[0030] Figure 9 is the top view structural schematic diagram of the pressing plate in the utility model.

[0031] Figure 10 is the structural schematic diagram of the anti-vortex mechanism in the utility model.

[0032] Wherein: wherein: 1 jacket head, 2 cylinder head, 3 inner cylinder, 4 jacket cylinder, 5 lower flange, 6 upper flange cover, 7 bolt assembly, 8 stirring mechanism, 9 stirring motor, 10 stirring shaft, 11 baffle, 12 air pipe, 1201 aeration disc, 13 support leg; a gas inlet, b exhaust port, c water inlet, d water outlet, e first discharge port, f inoculation port, q feeding port, m sampling port, h PH port, k DO port, t temperature measuring port, s side mirror, u mirror lamp;

[0033] ​14 skirt assembly, 15 connecting flange, 16 skirt exhaust pipe, 17 cylinder section, 18 lower head, 19 rib plate, 20 support ring, 21 support grid, 2101 first arc-shaped part, 2102 connecting part, 2103 second arc-shaped part, 2104 connecting bolt, 22 packing, 23 pressing plate, 2301 connecting plate, 2302 pressing strip, 24 cylinder, 25 retaining ring, 26 heat preservation ring, 27 protective climbing device, 28 lifting lug, 29 nameplate assembly, 30 anti-vortex baffle, 31 anti-vortex rib plate, 32 upper head; A feed pipe, B second discharge port, C safety valve port, D air inlet valve port, P pressure gauge port, T thermometer port, M manhole, J skirt inspection hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described clearly and completely below in combination with specific embodiments.

[0035] As shown in Figure 1 and Figure 2 A high COD organic wastewater treatment system, which comprises a biological oxidation tank, the biological oxidation tank comprises an inner cylinder 3 and a jacket cylinder 4 arranged outside the inner cylinder 3, the lower part of the jacket cylinder 4 is provided with a water inlet c, and the upper part is provided with a water outlet d; the bottom of the inner cylinder 3 is provided with a first discharge port e, the sidewall is provided with an air inlet a, a sampling port m and a plurality of detection ports, the top of the inner cylinder 3 is detachably fixed with an upper flange cover 6, the top of the inner cylinder 3 is provided with a lower flange 5, the lower flange 5 and the upper cover flange 6 are connected together through a bolt assembly 7, the upper flange cover 6 is provided with an exhaust port b, an inoculation port f and a plurality of feeding ports q, in the embodiment, the feeding ports q are provided with two, which are used for adding ammonia nitrogen and phosphorus respectively, the inoculation port f is an organic wastewater inlet, and the inoculation port f can also be used for adding activated sludge domesticated for the wastewater to be treated; the air inlet a is connected with an aeration disc 1201 located at the bottom of the inner cylinder 3 through a ventilation pipe 12 to distribute and aerate air; the middle part of the inner cylinder 3 is provided with a stirring mechanism 8.

[0036] Two feeding ports q are additionally arranged on the upper flange cover 6 of the biological oxidation tank, which are used for adding ammonia nitrogen and phosphorus, under the condition that air is introduced and a certain pressure and temperature are maintained, the content ratio of C, N and P in the wastewater is controlled, the dissolved oxygen of the wastewater is increased, the utilization rate of oxygen in the microorganisms in the activated sludge is improved, the metabolic rate is increased, the activated sludge is rapidly proliferated, the high-efficiency treatment of COD in the wastewater is realized, the high-level COD is reduced to a low level in a short time, and the wastewater with COD exceeding 10,000 has a significant advantage. The wastewater treatment system has high COD removal treatment efficiency, strong impact resistance, low cost, small investment, obvious environmental benefits and broad application prospect.

[0037] In this embodiment, the inner cylinder body 3 is provided with a cylinder head 2 at the lower end, and the jacket cylinder body 4 is provided with a jacket head 1 at the lower end; the sampling port m and the detection port are located at the lower part of the inner cylinder body 3 and are passed out from the side wall of the jacket cylinder body 4, Figure 1 The jacket cylinder body 4 located above and below the sampling port m and the detection port is communicated.

[0038] The detection port is provided with three, which are respectively PH port h, DO port k and temperature measuring port t, which are respectively used for detecting PH value, dissolved oxygen and temperature; the sampling port m is arranged on the right side of the inner cylinder body 3, which is used for sampling and detecting wastewater.

[0039] The air inlet a is arranged at the upper side wall of the inner cylinder body 3, and the first discharge port e is arranged at the center of the bottom of the inner cylinder body 3; the side mirror s is vertically arranged on the side wall of the inner cylinder body 3 along the up-down direction, which is used for observing the internal working condition of the inner cylinder body 3; the mirror u is arranged on the upper part of the side wall of the inner cylinder body 3, which is used for providing illumination for the inside of the inner cylinder body 3, so as to facilitate the observation of the inside through the side mirror s.

[0040] The stirring mechanism 8 includes a stirring motor 9 fixedly arranged at the center above the upper flange cover 6 and a stirring shaft 10 vertically arranged at the center inside the inner cylinder body 3, and the stirring shaft 10 is coaxially connected with the output shaft of the stirring motor 9;

[0041] The stirring mechanism 8 further includes a baffle 11 vertically fixedly arranged on the inner wall of the inner cylinder body 3, the width direction of the baffle 11 is arranged along the radial direction of the inner cylinder body 3, and a plurality of baffles 11 are uniformly arranged along the circumference of the inner wall of the inner cylinder body 3. By arranging the baffle 11, the stirring effect of the stirring mechanism 8 is enhanced.

[0042] As shown in Figures 3-5 As a further optimization, the high COD organic wastewater treatment system further includes a catalytic oxidation reaction tank, and the wastewater treated by the biological oxidation tank enters the catalytic oxidation reaction tank for catalytic oxidation treatment;

[0043] The catalytic oxidation reaction tank includes a cylinder body 24, a support ring 20 is fixedly arranged at the lower part of the cylinder body 24, and a plurality of rib plates 19 are uniformly fixed between the support ring 20 and the inner wall of the cylinder body 24; two support grating plates 21 are arranged above the support ring 20, and a filler 22 is arranged between the two support grating plates 21; a pressing plate 23 is arranged above the upper support grating plate 21, and the pressing plate 23 is fixedly connected with the inner wall of the cylinder body 24;

[0044] The cylinder body 24 is provided with a feeding pipe A at the lower end and a second discharge port B at the upper end, the top of the cylinder body 24 is provided with a safety valve port C, an air inlet valve port D and a pressure gauge port P, and the lower side wall of the cylinder body 24 is provided with a thermometer port T and a manhole M.

[0045] As Figures 6-9 shown in the embodiment, the support grid plate 21 is assembled together by the connecting bolt 2104 of the connecting part 2102 in the middle and the first arc-shaped part 2101 and the second arc-shaped part 2103 on both sides of the connecting part 2102; the pressing plate 23 includes two parallel pressing strips 2302 which are detachably connected together by the connecting bolt 2104 and the connecting plate 2301 which is fixed on the inner wall of the cylinder 24. The support grid plate 21 and the pressing plate 23 are designed in an assembled manner, which facilitates the installation and disassembly of the support grid plate 21.

[0046] A plurality of annular baffle rings 25 are horizontally fixed on the upper part of the cylinder 24 along the up-down direction, which are used to play the roles of baffle and mixing flow, prevent the wastewater from flowing directly along the inner wall of the cylinder 24, and make the wastewater flow from bottom to top in the mode of first-in first-out and last-in last-out; an annular heat preservation ring 26 is fixed on the upper end and the lower end of the outer wall of the cylinder 24, which is used to install the heat preservation layer outside the cylinder 24, and when the height of the cylinder 24 is high, the heat preservation ring 26 can be increased.

[0047] The lower end of the cylinder 24 is provided with a lower head 18, and the upper end is provided with an upper head 32; the lower part of the cylinder 24 is provided with a skirt assembly 14, and the upper part of the skirt assembly 14 is fixed with a cylinder section 17 through a connecting flange 15; the cylinder 24 is fixed on the upper end of the cylinder section 17, and two skirt exhaust pipes 16 are arranged on the side wall of the cylinder section 17; the skirt assembly 14 is provided with a skirt inspection hole J.

[0048] One end of the feed pipe A is connected at the center of the lower head 18, and the other end is arranged on the side wall of the skirt assembly 14; as Figure 10 shown, the inside of the lower head 18 is provided with an anti-vortex mechanism at the connection with the feed pipe A, which includes a circular anti-vortex baffle 30 and an anti-vortex rib plate 31 which is fixed in a cross shape below the anti-vortex baffle 30, and the anti-vortex rib plate 31 is fixed on the feed port of the lower head 18 which is connected with the feed pipe A.

[0049] The catalytic oxidation reaction tank is provided with a protective climbing device 27, a lifting lug 28 and a nameplate assembly 29, wherein the protective climbing device 27 includes a fence and a ladder.

[0050] Wastewater treatment process:

[0051] The wastewater to be treated enters a buffer tank for homogenization and pH adjustment, and then is pumped into a biological oxidation tank, in which biological filler is arranged and activated sludge domesticated for the wastewater to be treated is added; compressed air is introduced into the biological oxidation tank for distribution and aeration, the pressure in the reactor is controlled at 0.02-0.1 Mpa, the temperature is controlled at 30-35℃, the initial ammonia nitrogen content of the wastewater is controlled at 350-1500 mg / L, the initial phosphorus content is controlled at 50-200 mg / L, and the ammonia nitrogen content, total phosphorus content and dissolved oxygen in the wastewater during the treatment are controlled at ≥50 mg / L, ≥10 mg / L and ≥4 mg / L respectively, so that the wastewater stays in the biological oxidation tank for 12-48 h for biological oxidation treatment; the COD of the organic wastewater with a COD of 10000-50000 can be reduced to 4000-5000 after 12-48 h of biological oxidation treatment.

[0052] After the biological oxidation treatment, the effluent is filtered by a filtering device, heated by a heating device, and then enters a catalytic oxidation reaction tank, in which hydrogen peroxide is used as an oxidant, the filler 22 is used as an oxidation catalyst, and the wastewater is treated by LDO low-temperature wet catalytic oxidation for 30-60 min, so that the COD content of the wastewater reaches the discharge standard; the discharged liquid is cooled by a heat exchanger and then is discharged to an industrial wastewater treatment pipeline.

[0053] Although the utility model has been described in detail with reference to the foregoing embodiments, the skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-COD organic wastewater treatment system, characterized in that: It includes a biological oxidation tank, which comprises an inner cylinder and a jacketed cylinder disposed outside the inner cylinder. The jacketed cylinder has a water inlet at the bottom and a water outlet at the top. The inner cylinder has a first discharge port at the bottom and an air inlet, a sampling port, and several detection ports on its side wall. The top of the inner cylinder is detachably fixed with an upper flange cover, which has an exhaust port, an inoculation port, and several feed ports. The air inlet is connected to an aeration disc located at the bottom of the inner cylinder through a vent pipe. A stirring mechanism is disposed in the middle of the inner cylinder.

2. The high-COD organic wastewater treatment system according to claim 1, characterized in that: The lower end of the inner cylinder is provided with a cylinder end cap, and the lower end of the jacket cylinder is provided with a jacket end cap; the sampling port and the detection port are located at the lower part of the inner cylinder and protrude from the side wall of the jacket cylinder.

3. The high-COD organic wastewater treatment system according to claim 2, characterized in that: The detection port is provided with three ports, located on the left side of the inner cylinder, namely the pH port, DO port and temperature measuring port; the sampling port is located on the right side of the inner cylinder.

4. The high-COD organic wastewater treatment system according to claim 3, characterized in that: The air inlet is located on the upper side wall of the inner cylinder, and the first discharge port is located at the center of the bottom of the inner cylinder; a side mirror is vertically arranged on the side wall of the inner cylinder along the vertical direction.

5. A high-COD organic wastewater treatment system according to claim 3, characterized in that: The stirring mechanism includes a stirring motor fixedly installed at the center above the upper flange cover and a stirring shaft vertically installed at the center inside the inner cylinder. The stirring shaft is coaxially connected to the output shaft of the stirring motor. The stirring mechanism also includes a baffle that is vertically fixed on the inner wall of the inner cylinder. The width of the baffle is arranged radially along the radius of the inner cylinder, and multiple baffles are evenly arranged circumferentially along the inner wall of the inner cylinder.

6. A high-COD organic wastewater treatment system according to any one of claims 1-5, characterized in that: It also includes a catalytic oxidation reactor, in which wastewater, after being treated by the biological oxidation reactor, enters the catalytic oxidation reactor for catalytic oxidation treatment; The catalytic oxidation reactor includes a cylindrical body, a support ring fixedly provided at the lower part of the cylindrical body, and a plurality of ribs uniformly fixed between the support ring and the inner wall of the cylindrical body in a circumferential direction; two support grids are provided above the support ring, and packing is provided between the two support grids; a pressure plate is provided above the upper support grids, and the pressure plate is fixedly connected to the inner wall of the cylindrical body. The lower end of the cylinder is provided with a feed pipe, the upper end is provided with a second discharge port, the top of the cylinder is provided with a safety valve port, an air inlet valve port and a pressure gauge port, and the lower side wall of the cylinder is provided with a thermometer port and a manhole.

7. A high-COD organic wastewater treatment system according to claim 6, characterized in that: The supporting grid plate is detachably assembled together by connecting bolts from a connecting part located in the middle and a first arc-shaped part and a second arc-shaped part located on both sides of the connecting part; the pressure plate includes two parallel pressure strips, which are detachably fixed to the connecting plate by connecting bolts, and the connecting plate is fixed to the inner wall of the cylinder.

8. A high-COD organic wastewater treatment system according to claim 7, characterized in that: Several annular retaining rings are fixed horizontally on the upper part of the cylinder; an annular heat-insulating ring is fixed at the upper and lower ends of the outer wall of the cylinder.

9. A high-COD organic wastewater treatment system according to claim 7, characterized in that: The lower end of the cylinder is provided with a lower end cap, and the upper end is provided with an upper end cap. A skirt assembly is provided below the cylinder. A cylinder section is fixed above the skirt assembly through a connecting flange. The cylinder is fixed to the upper end of the cylinder section. Several skirt exhaust pipes are provided on the side wall of the cylinder section. A skirt inspection hole is provided on the skirt assembly.

10. A high-COD organic wastewater treatment system according to claim 9, characterized in that: One end of the feed pipe is connected to the center of the lower end cap, and the other end is set on the side wall of the skirt assembly. An anti-vortex mechanism is provided inside the lower end cap at the connection with the feed pipe. The anti-vortex mechanism includes a circular anti-vortex baffle and anti-vortex ribs fixed in a cross shape below the anti-vortex baffle. The anti-vortex ribs are fixed at the feed inlet on the lower end cap connected to the feed pipe.

Images