CN211226682U - Treatment device for wastewater with low BC ratio - Google Patents
Treatment device for wastewater with low BC ratio Download PDFInfo
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- CN211226682U CN211226682U CN201922065331.4U CN201922065331U CN211226682U CN 211226682 U CN211226682 U CN 211226682U CN 201922065331 U CN201922065331 U CN 201922065331U CN 211226682 U CN211226682 U CN 211226682U
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Abstract
The application discloses processing apparatus of waste water is compared to low BC, and the device of this application includes: the device comprises a gas-liquid mixer, a degassing tank and a tubular reactor filled with an ozone oxidation catalyst particle bed layer, wherein wastewater and ozone gas with a low BC ratio are introduced into the gas-liquid mixer, a liquid outlet of the gas-liquid mixer is divided into two paths, one path is connected with a rear end opening of the tubular reactor through a first regulating valve, and the other path is connected with a front end opening of the tubular reactor through a fourth regulating valve; the liquid inlet at the side part of the degassing tank is divided into two paths, one path is connected with the rear end opening of the tubular reactor through a second regulating valve, and the other path is connected with the front end opening of the tubular reactor through a third regulating valve; and introducing the liquid discharged from the tubular reactor into a degassing tank for degassing treatment, and respectively sending out the removed gas and the treated wastewater from the top and the bottom of the degassing tank. The device of this application is effectual to the desorption of COD in the waste water, and ozone oxidation catalyst particle bed is difficult for taking place to block up.
Description
Technical Field
The application belongs to the waste water treatment field, concretely relates to processing apparatus of low BC ratio waste water.
Background
The device for preparing olefin (DMTO) from methanol can generate wastewater with a COD value of 2000-2500mg/L and a total soluble solid content (TDS) value of below 200mg/L in the production process, the COD is reduced to about 110mg/L after biochemical treatment, the biodegradability of the wastewater is poor, the wastewater is not suitable for production and reuse due to high COD, and the COD can be directly used for production and reuse only by further reducing the COD in the wastewater in consideration of less salt content. Aiming at further reducing the COD value of the wastewater with low BC ratio, a strong oxidation agent is usually added to destroy the structure of organic matters difficult to biochemically treat in the wastewater and break the stable state of biochemical treatment, so that the COD value can be further reduced by the biochemical treatment, namely the BC ratio of the wastewater is improved.
The commonly used oxidants include chlorine dioxide, ozone and the like, the ozone is an unstable trivalent body of oxygen, the oxidation potential is the highest in the commonly used oxidants and reaches 2.07, the ozone is second to fluorine and is a strong oxidant in a free state, the destructiveness to organic matters difficult to biochemically treat in water is strong, and the tail gas after reaction is oxygen, so compared with the chlorine dioxide, the secondary pollution is avoided, so that the ozone method for improving the BC ratio of the wastewater is widely applied in the industry.
In the prior art, the treatment process for reducing the COD value of the wastewater by utilizing ozone oxidation generally has the defects of short contact time between ozone and the wastewater and low ozone utilization rate. Tubular reactors are also used in the industry when ozone is used, and the inside of the tubular reactor is filled with a molecular sieve particle bed layer, so that the rapid contact reaction of ozone and wastewater is enhanced, but the technical defects exist: when organic matters in ozone oxidation wastewater are decomposed, part of small molecular substances generated by oxidation decomposition can flocculate to form suspended matters and are slowly intercepted on a molecular sieve particle bed layer, so that the inside of the tubular reactor is gradually blocked, the flow resistance of a mixture of ozone and wastewater in the tubular reactor is gradually increased, the production process can not be normally carried out any more, at the moment, the tubular reactor needs to be disassembled, the molecular sieve particle bed layer in the tubular reactor needs to be disassembled and cleaned, and then the tubular reactor is refilled for wastewater treatment. The above process not only causes a problem that wastewater cannot be continuously treated, lowering the treatment efficiency of wastewater, but also increases the operation cost of wastewater production.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problems in the prior art, the present application aims to provide a treatment device for wastewater with a low BC ratio.
The device for treating the wastewater with the low BC ratio is characterized by comprising a gas-liquid mixer, a degassing tank and a tubular reactor, wherein an ozone oxidation catalyst particle bed layer is filled in the tubular reactor, the wastewater with the low BC ratio and ozone gas are respectively introduced into a liquid inlet and a gas inlet of the gas-liquid mixer, a liquid outlet of the gas-liquid mixer is divided into two paths, one path is connected with a rear end opening of the tubular reactor through a first regulating valve by a pipeline, and the other path is connected with a front end opening of the tubular reactor through a fourth regulating valve by a pipeline. The liquid inlet at the side part of the degassing tank is divided into two paths, one path is connected with the rear end opening of the tubular reactor through a second regulating valve by a pipeline, and the other path is connected with the front end opening of the tubular reactor through a third regulating valve by a pipeline; and introducing the treated mixed solution of ozone and wastewater discharged from the tubular reactor into a degassing tank for degassing treatment, discharging the removed gas from the top of the degassing tank, and discharging the treated wastewater from the bottom of the degassing tank.
The device for treating the wastewater with the low BC ratio is characterized by further comprising a wastewater feeding pump, wherein a liquid outlet of the wastewater feeding pump is connected with a liquid inlet of a gas-liquid mixer through a pipeline; and the waste water treated in the degassing tank is discharged from a liquid outlet at the bottom of the degassing tank in two ways, one way is used as qualified waste water to be discharged and collected into a waste water tank, and the other way is mixed with fresh waste water with low BC ratio and then conveyed into a gas-liquid mixer through a waste water feeding pump, so that part of the waste water in the degassing tank is returned to the tubular reactor again for the next cycle of treatment for degrading organic matters.
The device for treating the wastewater with the low BC ratio is characterized in that gas removed from the degassing tank is discharged from the top of the degassing tank in two paths, one path is subjected to tail gas treatment and then discharged after reaching standards, and the other path is mixed with fresh ozone and then introduced into the gas-liquid mixer from the gas inlet of the gas-liquid mixer, so that part of unreacted ozone is recycled.
The device for treating the wastewater with the low BC ratio is characterized in that the degassing tank adopts a pressure container, the gas-liquid mixer adopts a Venturi ejector, and the tubular reactor adopts a plug flow structure.
The device for treating the wastewater with the low BC ratio is characterized in that a first pressure gauge and a second pressure gauge for measuring hydraulic pressure are respectively arranged at the opening at the rear end and the opening at the front end of the tubular reactor.
The device for treating the wastewater with the low BC ratio is characterized in that the tubular reactor comprises a plurality of reaction pipe sections and a plurality of U-shaped connecting pipes, and the reaction pipe sections and the U-shaped connecting pipes are sequentially connected to form a tubular structure of a snake-shaped disc; an ozone oxidation catalyst particle bed layer is filled in each reaction pipe section, filter screens used for preventing ozone oxidation catalyst particles from being flushed out are arranged at openings at two ends of each reaction pipe section, and filling coefficients of the ozone oxidation catalyst particle bed layers in each reaction pipe section are within the range of 60% -80%.
The treatment process of the wastewater with the low BC ratio is characterized by comprising the following steps of:
1) opening the second regulating valve and the fourth regulating valve, and closing the first regulating valve and the third regulating valve; after mixing the wastewater with low BC ratio and ozone in a gas-liquid mixer, introducing the wastewater into a tubular reactor from a front end opening of the tubular reactor for reaction, slowly intercepting suspended matters in the wastewater on an ozone oxidation catalyst particle bed layer in the front end of the tubular reactor to gradually increase the absolute value of the pressure difference between a first pressure gauge and a second pressure gauge, enabling the reacted wastewater to flow out from a rear end opening of the tubular reactor and enter a degassing tank for degassing, discharging the removed gas from the top of the degassing tank, and discharging the treated wastewater from the bottom of the degassing tank;
2) when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is larger than or equal to a certain pressure value, opening the first regulating valve and the third regulating valve and closing the second regulating valve and the fourth regulating valve, changing the flow direction of the wastewater in the tubular reactor, leading the liquid flowing out of the gas-liquid mixer into the tubular reactor from the rear end opening of the tubular reactor for reaction, back flushing the suspended matters trapped in the ozone oxidation catalyst particle bed layer inside the front end of the tubular reactor, slowly trapping the suspended matters in the wastewater on the ozone oxidation catalyst particle bed layer inside the rear end of the tubular reactor, leading the wastewater after reaction to flow out of the front end opening of the tubular reactor and enter a degassing tank for degassing, discharging the removed gas from the top of the degassing tank, and discharging the treated wastewater from the bottom of the degassing tank;
3) when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is larger than or equal to a certain pressure value, the step 1) is repeated to switch the flow direction of the wastewater in the tubular reactor again, so that the step 1) and the step 2) are alternately performed in sequence, and the continuous treatment of the wastewater with the low BC ratio is realized.
The treatment process of the wastewater with the low BC ratio is characterized in that in the step 2), when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is greater than or equal to 0.3MPa, the first regulating valve and the third regulating valve are opened, the second regulating valve and the fourth regulating valve are closed, and the flowing direction of the wastewater in the tubular reactor is changed.
The treatment process of the wastewater with the low BC ratio is characterized in that in the step 3), when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is greater than or equal to 0.3MPa, the flow direction of the wastewater in the tubular reactor is switched again.
Compared with the prior art, the beneficial effect that this application was got is:
1. and part of the treated low BC ratio wastewater discharged from the bottom of the degassing tank is returned to the tubular reactor to remove COD, so that part of the wastewater is circularly treated, and the treatment effect of the wastewater is improved.
2. And mixing a second part of gas discharged from the top of the degassing tank with fresh ozone, and introducing the mixed gas into the gas-liquid mixer, so that the ozone is partially recycled, and the utilization rate of the ozone is improved.
3. This application adopts the tubular reactor of inside packing with ozone oxidation catalyst particle bed to handle low BC ratio waste water, and low BC ratio waste water and ozone are at the tubular reactor internal reaction, belong to the reaction under the pressurized state, and this concentration of dissolving of ozone in waste water is improved, increases the reaction effect of ozone and organic matter in the waste water.
4. Organic matter in the waste water decomposes under the combined action of ozone oxidant and catalyst fast, the suspended solid that partial small molecule material flocculation that decomposes produced and the little granule suspended solid that itself contains in the waste water, be held back slowly on ozone oxidation catalyst particle bed, make the circulation resistance increase of liquid in tubular reactor, this application is designed into through the circulation mode with waste water in tubular reactor "the flow direction of waste water takes the mode of regular forward, reverse interval switching in turn to carry out, make under the condition of online continuous reaction, the material of deposit on the ozone oxidation catalyst particle bed can be in time back-washed away", prevent that the catalyst from appearing blockking up, improve the circulation flux of waste water in tubular reactor.
Drawings
FIG. 1 is a schematic diagram of a low BC ratio wastewater treatment plant;
FIG. 2 is a schematic diagram showing the deposition of suspended solids in wastewater on the bed of ozonation catalyst particles inside the back end of the tubular reactor 8 when the flow of wastewater is a reverse flow;
FIG. 3 is a schematic view showing that suspended substances deposited on the bed of ozonation catalyst particles inside the rear end of the tubular reactor 8 are backwashed when the flow of wastewater is switched from the reverse flow to the forward flow;
FIG. 4 is a schematic diagram showing the deposition of suspended solids in wastewater on the bed of ozone oxidation catalyst particles inside the front end of the tubular reactor 8 when the flow of wastewater is a forward flow;
in fig. 1: 1-a first regulating valve, 2-a second regulating valve, 3-a third regulating valve, 4-a fourth regulating valve, 5-a wastewater feeding pump, 6-a gas-liquid mixer, 7-a degassing tank and 8-a tubular reactor.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b):
the utility model provides a processing apparatus of low BC ratio waste water, includes waste water charge pump 5, gas-liquid mixer 6, degasification jar 7 and tubular reactor 8, the inside ozone oxidation catalyst granule bed that is packed with of tubular reactor 8, the inlet of gas-liquid mixer 6 is connected with waste water charge pump 5, carries low BC ratio waste water in to gas-liquid mixer 6 through waste water charge pump 5. Ozone gas is introduced into the gas inlet of the gas-liquid mixer 6. The liquid outlet of the gas-liquid mixer 6 is divided into two paths, one path is connected with the rear end opening of the tubular reactor 8 through a first regulating valve 1 by a pipeline, and the other path is connected with the front end opening of the tubular reactor 8 through a fourth regulating valve 4 by a pipeline. The degassing tank 7 adopts a pressure container, the gas-liquid mixer 6 adopts a Venturi ejector, and the tubular reactor 8 adopts a plug flow structure.
Referring to FIG. 1, the tubular reactor 8 comprises a plurality of reaction tube sections and a plurality of U-shaped connecting tubes, which are sequentially connected to form a tubular structure of a serpentine disk bar; an ozone oxidation catalyst particle bed layer is filled in each reaction pipe section, filter screens used for preventing ozone oxidation catalyst particles from being flushed out are arranged at openings at two ends of each reaction pipe section, and filling coefficients of the ozone oxidation catalyst particle bed layers in each reaction pipe section are within the range of 60% -80%.
Referring to fig. 1, the liquid inlet on the side of the degassing tank 7 is divided into two paths, one path is connected with the rear end opening of the tubular reactor 8 through the second regulating valve 2 by a pipeline, and the other path is connected with the front end opening of the tubular reactor 8 through the third regulating valve 3 by a pipeline; the mixed liquid of the treated ozone and the wastewater discharged from the tubular reactor 8 is introduced into a degassing tank 7 for degassing treatment, the removed gas is discharged from the top of the degassing tank 7, and the treated wastewater is discharged from the bottom of the degassing tank 7.
In order to improve the treatment effect of the wastewater with low BC ratio, the wastewater discharged from the bottom of the degassing tank 7 is subjected to partial circulating treatment, and the process is as follows: and the wastewater treated in the degassing tank 7 is discharged from a liquid outlet at the bottom of the degassing tank 7 in two ways, one way is used as qualified wastewater to be collected into a wastewater tank, the other way is mixed with fresh wastewater with low BC ratio and then is conveyed into a gas-liquid mixer 6 through a wastewater feeding pump 5, so that part of the wastewater in the degassing tank 7 is returned into the tubular reactor 8 again for the next cycle of treatment for degrading organic matters.
In order to improve the utilization rate of ozone, the wastewater discharged from the top of the degassing tank 7 is partially recycled, and the process comprises the following steps: the gas removed in the degassing tank 7 is discharged from the top of the degassing tank 7 in two paths, one path is subjected to tail gas treatment and then discharged after reaching standards, and the other path is mixed with fresh ozone and then introduced into the gas-liquid mixer 6 from the gas inlet of the gas-liquid mixer 6, so that part of unreacted ozone is recycled.
In order to detect the hydraulic pressure of the liquid flow at the rear end opening and the front end opening of the tubular reactor 8, a first pressure gauge and a second pressure gauge are respectively arranged at the rear end opening and the front end opening of the tubular reactor 8.
Referring to fig. 1, the flow direction of the wastewater flowing from the rear end opening of the tubular reactor 8 to the front end opening of the tubular reactor 8 during the flow of the wastewater in the tubular reactor is defined as a reverse flow (when referring to fig. 2 as a reverse flow, suspended matter is trapped on the bed of ozone oxidation catalyst particles inside the rear end of the tubular reactor 8). The flow direction from the front end opening of the tubular reactor 8 to the rear end opening of the tubular reactor 8 is defined as a forward flow (in the case of the forward flow in comparison with fig. 4, suspended matter is trapped on the bed of ozone oxidation catalyst particles inside the front end of the tubular reactor 8).
A treatment process of wastewater with low BC ratio comprises the following steps of, by weight:
1) the second and fourth control valves 2, 4 are first opened and the first and third control valves 1, 3 are closed, so that the flow of wastewater in the pipe reactor 8 is a forward flow. After the wastewater with the low BC ratio and the ozone are mixed in the gas-liquid mixer 6, the wastewater is introduced into the tubular reactor 8 from the front end opening of the tubular reactor 8 for reaction, suspended matters in the wastewater are slowly intercepted on an ozone oxidation catalyst particle bed layer in the front end of the tubular reactor 8, so that absolute values of pressure difference between a first pressure gauge and a second pressure gauge are gradually increased, filtered clean water flows out from the ozone oxidation catalyst particle bed layer in the rear end of the tubular reactor 8, the reacted wastewater flows out from the rear end opening of the tubular reactor 8 and enters the degassing tank 7 for degassing, the removed gas is discharged from the top of the degassing tank 7, and the treated wastewater is discharged from the bottom of the degassing tank 7;
2) when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is greater than or equal to a certain pressure value, the first regulating valve 1 and the third regulating valve 3 are opened, and the second regulating valve 2 and the fourth regulating valve 4 are closed (i.e. the flow direction of the wastewater is switched, so that the flow direction of the wastewater in the tubular reactor 8 is a reverse flow path). At the moment, the wastewater back-washes away suspended matters trapped in an ozone oxidation catalyst particle bed layer in the front end of the tubular reactor 8, the suspended matters in the wastewater are slowly trapped on the ozone oxidation catalyst particle bed layer in the rear end of the tubular reactor 8, the wastewater after reaction flows out from an opening at the front end of the tubular reactor 8 and enters the degassing tank 7 for degassing, the removed gas is discharged from the top of the degassing tank 7, and the treated wastewater is discharged from the bottom of the degassing tank 7;
3) when the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is larger than or equal to a certain pressure value, the flow direction of the wastewater in the tubular reactor can be switched again. Thus, the step 1) and the step 2) are alternately performed in sequence, and continuous treatment of the wastewater with the low BC ratio is realized.
Example 1:
the SBR processing device of the DMTO device of the company is low in BC ratio (namely BOD5/COD ratio) wastewater, the water outlet flow rate is 80m for carrying out the high-speed dry distillation/h, the COD is 100mg/L, the TDS is 500mg/L, and the BOD is almost zero, so that the requirement of reuse water cannot be met. The wastewater is treated by the device, the ozone oxidation catalyst in the tubular reactor 8 adopts a spherical molecular sieve-supported metal ozone water treatment special catalyst (the ozone oxidation catalyst adopts 10wt% Pt/ZSM-5 molecular sieve catalyst), and the filling coefficient of an ozone oxidation catalyst particle bed layer in each reaction tube section is 70%.
When the device of the application is used for treating wastewater, the forward flow and the reverse flow of the wastewater can be alternately switched. The specific treatment process is as follows:
1) first, the first regulating valve 1 and the third regulating valve 3 are opened, and the second regulating valve 2 and the fourth regulating valve 4 are closed, so that the flow direction of the wastewater in the tubular reactor 8 is a reverse flow. After the wastewater is mixed with ozone in a gas-liquid mixer 6 (the concentration of the ozone in the wastewater is 15 mg/L), the wastewater is introduced into a tubular reactor 8 from a rear end opening of the tubular reactor 8 for reaction, the pressure value detected by a first pressure gauge is 0.8MPa, the pressure value detected by a second pressure gauge is 0.6MPa, the residence time of the wastewater and the ozone in the tubular reactor 8 is 45min, the wastewater after the reaction flows out of a front end opening of the tubular reactor 8 and enters a degassing tank 7 for degassing, the removed gas is discharged from the top of the degassing tank 7, the treated wastewater is discharged from the bottom of the degassing tank 7, the COD (chemical oxygen demand) of the wastewater discharged from the bottom of the degassing tank 7 is not more than 50mg/L, and the TDS (total dissolved solids) is not more than 100 mg/L;
2) after the reverse flow path has been operated for a period of time, the pressure value detected by the first pressure gauge is gradually increased and the pressure value detected by the second pressure gauge is gradually decreased (compare fig. 2, suspended matter is trapped on the bed of ozone oxidation catalyst particles inside the rear end of the tubular reactor 8). When the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is larger than 0.3Ma, the second regulating valve 2 and the fourth regulating valve 4 are opened, and the first regulating valve 1 and the third regulating valve 3 are closed (namely, the flow direction of the wastewater is switched: compare with figure 3, the ozone oxidation catalyst particle bed layer in the tubular reactor 8 is loosened under the impact of the reversing water flow, and suspended matters trapped on the ozone oxidation catalyst particle bed layer in the rear end of the tubular reactor 8 are quickly flushed out), the pressure value detected by the second pressure gauge is close to 0.8MPa, the pressure value detected by the first pressure gauge is close to 0.6MPa, the residence time of the wastewater and the ozone in the tubular reactor 8 is 45min (therefore, the flow direction of the wastewater in the tubular reactor 8 can be alternately switched, the interior of the tubular reactor 8 is dredged regularly, and the catalyst particle bed layer is prevented from being blocked), the reacted waste water flows out from the rear end opening of the tubular reactor 8 and enters the degassing tank 7 for degassing, the removed gas is discharged from the top of the degassing tank 7, the treated waste water is discharged from the bottom of the degassing tank 7, and the COD of the waste water discharged from the bottom of the degassing tank 7 is not more than 50mg/L, TDS and not more than 100 mg/L.
3) When the absolute value of the pressure difference between the first pressure gauge and the second pressure gauge is more than 0.3Ma, the step 1) is repeated to switch the flow direction of the wastewater in the tubular reactor again. Therefore, the step 1) and the step 2) are sequentially and alternately carried out, continuous treatment of wastewater with low BC ratio is realized, the deposition speed of suspended matters in the wastewater in the tubular reactor 8 in the actual production process is low, the flow direction is basically switched once after 15-30 days of operation, the system operation condition is good within 1-2 years of continuous operation, and the tubular reactor 8 needs to be disassembled after 1-2 years of continuous operation to replace the catalyst.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (6)
1. A treatment device for wastewater with a low BC ratio is characterized by comprising a gas-liquid mixer (6), a degassing tank (7) and a tubular reactor (8), wherein an ozone oxidation catalyst particle bed layer is filled in the tubular reactor (8), a liquid inlet and a gas inlet of the gas-liquid mixer (6) are respectively filled with the wastewater with the low BC ratio and ozone gas, a liquid outlet of the gas-liquid mixer (6) is divided into two paths, one path is connected with a rear end opening of the tubular reactor (8) through a first regulating valve (1) by a pipeline, and the other path is connected with a front end opening of the tubular reactor (8) through a fourth regulating valve (4) by a pipeline;
a liquid inlet at the side part of the degassing tank (7) is divided into two paths, one path is connected with a rear end opening of the tubular reactor (8) through a second regulating valve (2) by a pipeline, and the other path is connected with a front end opening of the tubular reactor (8) through a third regulating valve (3) by a pipeline; the mixed liquid of the treated ozone and the wastewater discharged from the tubular reactor (8) is introduced into a degassing tank (7) for degassing treatment, the removed gas is discharged from the top of the degassing tank (7), and the treated wastewater is discharged from the bottom of the degassing tank (7).
2. The apparatus for treating wastewater with low BC ratio according to claim 1, further comprising a wastewater feeding pump (5), wherein the outlet of the wastewater feeding pump (5) is connected with the inlet of the gas-liquid mixer (6) by a pipeline; and the wastewater treated in the degassing tank (7) is discharged from a liquid outlet at the bottom of the degassing tank (7) in two ways, one way is used as qualified wastewater to be discharged and collected into a wastewater tank, the other way is mixed with fresh wastewater with a low BC ratio and then is conveyed into a gas-liquid mixer (6) through a wastewater feeding pump (5), so that part of the wastewater in the degassing tank (7) is returned to the tubular reactor (8) again for the next cycle of treatment for degrading organic matters.
3. The apparatus for treating wastewater with low BC ratio as claimed in claim 1, wherein the gas removed from the degassing tank (7) is discharged from the top of the degassing tank (7) in two ways, one way is treated with tail gas and then discharged after reaching standards, and the other way is mixed with fresh ozone and then introduced into the gas-liquid mixer (6) from the gas inlet of the gas-liquid mixer (6) to recycle part of the unreacted ozone.
4. The apparatus for treating wastewater with low BC ratio according to claim 1, wherein the degassing tank (7) is a pressure vessel, the gas-liquid mixer (6) is a Venturi ejector, and the tubular reactor (8) is a plug flow type structure.
5. The apparatus for treating wastewater with low BC ratio as claimed in claim 1, wherein the tubular reactor (8) is provided at the rear opening and the front opening with a first pressure gauge and a second pressure gauge for measuring hydraulic pressure, respectively.
6. The low BC ratio wastewater treatment plant according to claim 1, wherein the tubular reactor (8) comprises a plurality of reaction tube sections and a plurality of U-shaped connecting tubes, and the reaction tube sections and the U-shaped connecting tubes are connected in sequence to form a tubular structure of a S-shaped disc; an ozone oxidation catalyst particle bed layer is filled in each reaction pipe section, filter screens used for preventing ozone oxidation catalyst particles from being flushed out are arranged at openings at two ends of each reaction pipe section, and filling coefficients of the ozone oxidation catalyst particle bed layers in each reaction pipe section are within the range of 60% -80%.
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