CN210974232U - TDI wastewater pretreatment device - Google Patents
TDI wastewater pretreatment device Download PDFInfo
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- CN210974232U CN210974232U CN201921327719.0U CN201921327719U CN210974232U CN 210974232 U CN210974232 U CN 210974232U CN 201921327719 U CN201921327719 U CN 201921327719U CN 210974232 U CN210974232 U CN 210974232U
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Abstract
The utility model relates to a TDI wastewater pretreatment device, which comprises a micro-electrolysis device, an open slot, an impurity sedimentation tank, a primary Fenton oxidation device, a primary neutralization flocculation sedimentation tank, a secondary Fenton oxidation device and a secondary neutralization flocculation sedimentation tank which are sequentially communicated through pipelines; impurity sedimentation tank, one-level fenton oxidation unit, one-level and flocculation sedimentation tank, second grade and flocculation sedimentation tank's water inlet all is higher than the delivery port setting, is provided with shaftless conveyer along the wastewater flow direction in the open slot, and impurity sedimentation tank inboard is provided with the overflow weir in delivery port department, and the bottom of impurity sedimentation tank is provided with the impurity discharge port, is provided with the control valve on the pipeline with the impurity discharge port intercommunication. The device can effectively precipitate and filter impurities generated by the micro-electrolysis device, and prevents other devices from being blocked.
Description
Technical Field
The utility model relates to a waste water treatment device technical field especially relates to a TDI wastewater pretreatment device.
Background
The waste water produced in the production process of TDI (toluene diisocynate) contains nitration waste water, hydrogenation waste water and photochemical waste water, which are abbreviated as TDI waste water and belong to high-concentration organic waste water. The nitrifying wastewater contains refractory nitrobenzene organic matters, aniline organic matters and the like, the hydrogenating wastewater contains high-concentration aniline organic matters, and the photochemical wastewater contains refractory o-dichlorobenzene. TDI wastewater is characterized by difficult degradation, poor biochemical property, toxic action of characteristic pollutants on microorganisms and the like, and the currently adopted pretreatment process is a micro-electrolysis, Fenton oxidation and neutralization flocculation precipitation technology, but has more problems:
the first step is that a micro-electrolysis device directly and continuously adds a medicament into a tank, wherein the medicament is one or more of iron powder, activated carbon and cast iron powder according to a certain mixing ratio, the purity of the iron powder or the cast iron powder is only about 85 percent, and unreacted medicaments and unreacted impurities in the medicament in the micro-electrolysis process easily cause impurity accumulation to cause the blockage of a Fenton oxidation device;
secondly, the discontinuous and non-uniform dosing caused by the incomplete process control of the system leads to the unstable treatment effect and larger fluctuation of pretreated effluent;
and thirdly, the TDI wastewater belongs to high-concentration organic wastewater which is difficult to degrade, the primary Fenton oxidation treatment can not meet the treatment requirement, the biochemical BOD5/CODcr of the effluent is below 0.25, and the stable operation of a downstream biochemical system is greatly influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a TDI wastewater pretreatment device, which can effectively precipitate and filter the impurities generated by the micro-electrolysis device, thereby preventing the blockage of other devices in the pretreatment device and improving the treatment effect of TDI wastewater pretreatment.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a TDI wastewater pretreatment device comprises a micro-electrolysis device, an open slot, an impurity sedimentation tank, a primary Fenton oxidation device, a primary neutralization flocculation sedimentation tank, a secondary Fenton oxidation device and a secondary neutralization flocculation sedimentation tank which are sequentially communicated through pipelines; impurity sedimentation tank, one-level fenton oxidation unit, one-level and flocculation sedimentation tank, second grade and flocculation sedimentation tank's water inlet all is higher than the delivery port setting, is provided with shaftless conveyer along the wastewater flow direction in the open slot, and impurity sedimentation tank inboard is provided with the overflow weir in delivery port department, and the bottom of impurity sedimentation tank is provided with the impurity discharge port, is provided with the control valve on the pipeline with the impurity discharge port intercommunication.
The open slot is obliquely and downwards arranged from one side of the micro-electrolysis device to the side of the impurity precipitation tank, and the communication pipeline between the impurity precipitation tank and the open slot is obliquely and downwards arranged from the side of the open slot to the side of the impurity precipitation tank.
Wherein, the inclination angles of the communicating pipelines between the open slot and the impurity sedimentation tank and the open slot are both 3 degrees.
The upper part of the groove body of the open groove is cuboid, the top surface of the groove body is open, and the lower part of the groove body is semicylindrical; the upper part of the impurity sedimentation tank is cylindrical, and the lower part of the impurity sedimentation tank is funnel-shaped.
Wherein, little electrolysis device includes little electrolysis charge device and little electrolysis reaction unit, and little electrolysis charge device sets up the top at little electrolysis reaction unit.
The micro-electrolysis chemical feeding device comprises a chemical feeding groove, the bottom of the chemical feeding groove is provided with a feeding hole facing the micro-electrolysis reaction device, and a sleeve is sleeved on the feeding hole; the bottom of the dosing groove is internally provided with a screw shaft conveyor, the screw shaft conveyor extends to one side of the feeding port along one side opposite to the feeding port of the dosing groove, and the end part of the screw shaft conveyor extends into the sleeve.
Wherein, the screw shaft conveyor is driven by a driving motor to rotate.
Wherein, be provided with vertical mechanical agitator that sets up among the little electrolytic reaction device.
And a plurality of independent earlobes for adding different medicaments are arranged on the primary neutralization flocculation sedimentation tank and the secondary neutralization flocculation sedimentation tank.
The utility model discloses following beneficial effect has:
the utility model discloses at the rear end of traditional little electrolysis reaction unit series connection open slot and impurity sedimentation tank, adopt the gravity flow mode, the open slot embeds shaftless conveyer, avoids not participating in the impurity of reaction in the medicament of little electrolysis process unreacted and medicament to deposit at the open slot, can push away impurity to the sedimentation tank completely, carries out abundant solid-liquid separation at the sedimentation tank; the bottom of the impurity sedimentation tank is provided with an impurity discharge port for discharging impurities periodically, so that the problem of accumulation and blockage caused by the impurities entering the Fenton oxidation device is avoided;
in addition, the rear end of the traditional neutralization flocculation and precipitation device is connected with the Fenton oxidation device and the neutralization flocculation and precipitation device in series, and a self-flowing mode is adopted to form a micro-electrolysis and two-stage Fenton treatment process, so that the treatment stability is ensured, the adaptability to incoming water fluctuation is improved, the treatment effect can be obviously improved, and the water quality with better stability and biochemical property is provided for a downstream biochemical system.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a micro-electrolysis apparatus according to the present invention;
fig. 3 is a schematic structural diagram of an open slot of the present invention;
fig. 4 is a schematic structural diagram of the impurity settling tank of the present invention.
Description of reference numerals:
the device comprises a 1-micro-electrolysis device, a 11-micro-electrolysis dosing device, a 111-dosing tank, a 112-feeding port, a 113-sleeve, a 114-spiral shaft conveyor, a 115-driving motor, a 12-micro-electrolysis reaction device, a 121-iron carbon feeding port, a 122-water inlet of the micro-electrolysis reaction device, a 123-water outlet of the micro-electrolysis reaction device, a 124-longitudinal mechanical stirrer, a 2-open slot, a 21-shaftless conveyor, a 22-communicating pipeline, a 3-impurity settling tank, a 31-overflow weir, a 32-control valve, a 4-first-stage Fenton oxidation device, a 5-first-stage neutralization flocculation settling tank, a 6-second-stage Fenton oxidation device and a 7-second-stage neutralization flocculation settling tank.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments:
referring to fig. 1 to 4, a TDI wastewater pretreatment device comprises a micro-electrolysis device 1, an open slot 2, an impurity sedimentation tank 3, a primary fenton oxidation device 4, a primary neutralization flocculation sedimentation tank 5, a secondary fenton oxidation device 6 and a secondary neutralization flocculation sedimentation tank 7 which are sequentially communicated through pipelines.
The micro-electrolysis device 1 comprises a micro-electrolysis medicine adding device 11 and a micro-electrolysis reaction device 12, wherein the micro-electrolysis medicine adding device 11 is arranged above the micro-electrolysis reaction device 12. The micro-electrolysis dosing device 11 comprises a dosing groove 111, the dosing groove 111 is cuboid, a feeding port 112 facing the micro-electrolysis reaction device 12 is formed in the bottom of the dosing groove 111, and a sleeve 113 is sleeved on the feeding port 112. A screw shaft conveyor 114 is arranged inside the bottom of the dosing groove 111, the screw shaft conveyor 114 extends to one side of the feeding port 112 along one side opposite to the feeding port 112 of the dosing groove 111, and the end part of the screw shaft conveyor 114 extends into the sleeve 113. The screw conveyor 114 is driven to rotate by a drive motor 115.
The top of the micro-electrolysis reaction device 12 is provided with an iron-carbon feed inlet 121 facing the feed inlet 112 of the dosing groove 111, one side of the micro-electrolysis reaction device 12 is provided with a water inlet 122, and the other side of the micro-electrolysis reaction device 12 is provided with a water outlet 123. Preferably, a vertical longitudinal mechanical stirrer 124 is arranged in the micro-electrolysis reaction device 12.
The open slot 2 is inclined downwards from one side of the micro-electrolysis device 1 to the side of the impurity sedimentation tank 3, preferably, the inclination angle of the open slot 2 is 3 degrees. The upper portion of the groove body of the open slot 2 is cuboid and the top surface is open, the lower portion of the groove body is semi-cylinder and the inside of the groove body is provided with a shaftless conveyor 21 along the flowing direction of waste water in the open slot 2, and the shaftless conveyor 21 continuously forwards pushes deposited impurities to the impurity sedimentation tank 3.
The communicating pipeline 22 between the impurity sedimentation tank 3 and the open slot 2 is arranged from the open slot 2 side to the impurity sedimentation tank 3 side in an inclined and downward manner, and the inclined angle of the communicating pipeline 22 between the impurity sedimentation tank 3 and the open slot 2 is preferably 3 degrees. The upper part of the impurity sedimentation tank 3 is cylindrical, and the lower part is funnel-shaped. One side that the upper portion of impurity sedimentation tank 3 is close to open slot 2 is provided with the water inlet, and one side relative with open slot 2 is provided with the delivery port, the water inlet is higher than the delivery port and sets up and utilizes the liquid level difference mode of flowing automatically to go out water. The inboard weir 31 that is provided with in delivery port department of impurity sedimentation tank 3, the bottom of impurity sedimentation tank 3 is provided with the impurity discharge port, be provided with control valve 32 on the impurity discharge port and be connected with external equipment through the pipeline for regularly discharge the impurity of 3 bottoms in impurity sedimentation tank.
Further, the water inlets of the first-stage Fenton oxidation device 4, the first-stage neutralization flocculation and precipitation tank 5, the second-stage Fenton oxidation device 6 and the second-stage neutralization flocculation and precipitation tank 7 are all higher than the water outlets and are arranged to discharge water in a liquid level difference self-flowing mode. A plurality of independent earlobes (not shown in the figure) for adding different medicaments are arranged on the primary neutralization flocculation sedimentation tank 5 and the secondary neutralization flocculation sedimentation tank 7.
The method comprises the steps of respectively putting medicaments such as iron powder, activated carbon and the like into a medicament feeding groove, conveying the medicaments to a feeding port by a screw shaft conveyor, putting the medicaments into a micro-electrolysis reaction device through a sleeve, conveying TDI wastewater into the micro-electrolysis reaction device through a water inlet, reacting under the action of a longitudinal mechanical stirrer, flowing into an open slot through a pipeline through a water outlet, pushing impurities in the open slot into an impurity sedimentation tank by a shaftless conveyor, precipitating the impurities in the impurity sedimentation tank and periodically discharging the impurities from an impurity discharging port, and simultaneously, automatically flowing the wastewater into the impurity sedimentation tank, a primary Fenton oxidation device, a primary neutralization flocculation sedimentation tank, a secondary Fenton oxidation device and a secondary neutralization flocculation sedimentation tank in sequence for treatment, wherein the COD of effluent is stabilized below 500 mg/L, and the B/C is increased to above 0.3.
The above only is the detailed implementation manner of the present invention, not limiting the patent scope of the present invention, all the equivalent structure changes made in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. A TDI wastewater pretreatment device is characterized in that: comprises a micro-electrolysis device (1), an open slot (2), an impurity sedimentation tank (3), a primary Fenton oxidation device (4), a primary neutralization flocculation sedimentation tank (5), a secondary Fenton oxidation device (6) and a secondary neutralization flocculation sedimentation tank (7) which are sequentially communicated through pipelines; impurity sedimentation tank (3), one-level fenton oxidation unit (4), one-level neutralization flocculation and precipitation pond (5), the water inlet of second grade fenton oxidation unit (6) and second grade neutralization flocculation and precipitation pond (7) all is higher than the delivery port setting, be provided with shaftless conveyer (21) along the waste water flow direction in open slot (2), impurity sedimentation tank (3) inboard is provided with overflow weir (31) in delivery port department, the bottom of impurity sedimentation tank (3) is provided with the impurity discharge port, be provided with control valve (32) on the pipeline with the impurity discharge port intercommunication.
2. The TDI wastewater pretreatment device of claim 1, wherein: the open slot (2) is inclined downwards towards the impurity sedimentation tank (3) by one side of the micro-electrolysis device (1), and the communicating pipeline (22) between the impurity sedimentation tank (3) and the open slot (2) is inclined downwards towards the impurity sedimentation tank (3) by the open slot (2).
3. The TDI wastewater pretreatment device of claim 2, wherein: the inclination angles of the open grooves (2) and the communication pipelines (22) between the impurity sedimentation tank (3) and the open grooves (2) are both 3 degrees.
4. The TDI wastewater pretreatment device of claim 1, wherein: the upper part of the groove body of the open groove (2) is cuboid, the top surface of the groove body is open, and the lower part of the groove body is semicylindrical; the upper part of the impurity sedimentation tank (3) is cylindrical, and the lower part is funnel-shaped.
5. The TDI wastewater pretreatment device of claim 1, wherein: the micro-electrolysis device (1) comprises a micro-electrolysis medicine adding device (11) and a micro-electrolysis reaction device (12), and the micro-electrolysis medicine adding device (11) is arranged above the micro-electrolysis reaction device (12).
6. The TDI wastewater pretreatment device of claim 5, wherein: the micro-electrolysis dosing device (11) comprises a dosing groove (111), the bottom of the dosing groove (111) is provided with a feeding port (112) facing the micro-electrolysis reaction device (12), and the feeding port (112) is sleeved with a sleeve (113); a screw shaft conveyor (114) is arranged inside the bottom of the dosing groove (111), the screw shaft conveyor (114) extends to one side of the feeding port (112) along one side opposite to the feeding port (112) of the dosing groove (111), and the end part of the screw shaft conveyor extends into the sleeve (113).
7. The TDI wastewater pretreatment device of claim 6, wherein: the screw shaft conveyor (114) is driven to rotate by a driving motor (115).
8. The TDI wastewater pretreatment device of claim 5, wherein: the micro-electrolysis reaction device (12) is internally provided with a vertical longitudinal mechanical stirrer (124).
9. The TDI wastewater pretreatment device of claim 1, wherein: and a plurality of independent earlobes for adding different medicaments are arranged on the primary neutralization flocculation sedimentation tank (5) and the secondary neutralization flocculation sedimentation tank (7).
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| CN201921327719.0U CN210974232U (en) | 2019-08-16 | 2019-08-16 | TDI wastewater pretreatment device |
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| CN201921327719.0U CN210974232U (en) | 2019-08-16 | 2019-08-16 | TDI wastewater pretreatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169244A (en) * | 2020-10-11 | 2021-01-05 | 甘肃银光聚银化工有限公司 | Method for rapidly treating leaked toluene diisocyanate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169244A (en) * | 2020-10-11 | 2021-01-05 | 甘肃银光聚银化工有限公司 | Method for rapidly treating leaked toluene diisocyanate |
| CN112169244B (en) * | 2020-10-11 | 2022-01-04 | 甘肃银光聚银化工有限公司 | Method for rapidly treating leaked toluene diisocyanate |
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