CN219194739U - Maleic anhydride wastewater treatment device - Google Patents

Abstract

The utility model relates to a maleic anhydride wastewater treatment device which comprises an anaerobic unit, an aerobic unit and an ozone catalytic oxidation unit, wherein the anaerobic unit comprises a hydrolysis tank, a water distributor and a UASB tank, the water distributor is arranged in the hydrolysis tank and communicated with the UASB tank, the water distributor distributes water after pressurizing the pretreated maleic anhydride wastewater, the aerobic unit comprises an aerobic tank, the aerobic tank is communicated with the UASB tank, the ozone catalytic oxidation unit comprises an ozone contact tank, a water inlet of the ozone contact tank is communicated with the aerobic tank, and a water outlet of the ozone contact tank is communicated with a discharge area. The anaerobic section of the maleic anhydride wastewater adopts a serial connection method of hydrolysis and UASB, so that the biodegradability of the maleic anhydride wastewater can be improved, the organic matters in the maleic anhydride wastewater can be removed by an aerobic unit, and the chemical oxygen demand COD in the maleic anhydride wastewater can be reduced under the oxidation of an ozone catalytic oxidation unit. The sewage treatment mode of the biochemical method does not need to be provided with a concentration tank alone, reduces the treatment cost and also reaches the emission standard.

Description

Maleic anhydride wastewater treatment device

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a maleic anhydride wastewater treatment device.

Background

The maleic anhydride is mainly applied to the industries of glass fiber reinforced plastic raw material production, petrochemical industry, food processing, medicine, building materials and the like, and has extremely broad development and application prospects. In the process of producing maleic anhydride by using a maleic anhydride device of the n-butane method, maleic anhydride wastewater is generated. The maleic anhydride wastewater needs to be treated and is discharged after reaching the discharge standard. The chemical oxygen demand COD (Chemical Oxygen Demand) is an important index for indicating the organic pollution of the water body, and can reflect the pollution degree of the water body. When the maleic anhydride wastewater is reduced to below 500mg/L, the maleic anhydride wastewater can be discharged.

In the prior art, maleic anhydride wastewater can be treated by adopting a physicochemical method (such as concentration and evaporation) and a biochemical method, and the physicochemical method has complicated operation and high treatment cost; the maleic anhydride wastewater treated by the biochemical method is difficult to reach the discharge standard of Chemical Oxygen Demand (COD).

Therefore, a treatment device for maleic anhydride wastewater is needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a maleic anhydride wastewater treatment device, which aims to solve the problems that the operation and running of the existing maleic anhydride wastewater treatment device are complicated, the treatment cost is high, and the emission standard of Chemical Oxygen Demand (COD) is difficult to reach.

In order to achieve the aim, the utility model provides a maleic anhydride wastewater treatment device,

a maleic anhydride wastewater treatment device comprises:

the anaerobic unit comprises a hydrolysis tank, a water distributor and a UASB tank, wherein the water distributor is arranged in the hydrolysis tank, the hydrolysis tank is communicated with the UASB tank, the water distributor can distribute water from the bottom of the tank after pressurizing the pretreated maleic anhydride wastewater, the hydrolysis tank is internally provided with dominant facultative anaerobes, and the UASB tank is internally provided with one or more of dominant facultative anaerobes, hydrogen-producing acetic acid-producing bacteria and methane bacteria;

the aerobic unit comprises an aerobic tank which can be communicated with the UASB tank;

the ozone catalytic oxidation unit comprises an ozone contact tank, ozone can be uniformly distributed in the ozone contact Chi Naneng, a water inlet of the ozone contact tank can be communicated with the aerobic tank, and a water outlet of the ozone contact tank is configured to be communicated with the discharge area.

Further, the water distributor comprises a pressure water distribution tank and a water outlet head, the water outlet head is arranged at the bottom of the hydrolysis tank, the pretreated maleic anhydride wastewater can be pressurized in the pressure water distribution tank, and the water outlet of the pressure water distribution tank is communicated with the water outlet head.

Further, a double-layer hydrolytic sludge layer is arranged in the hydrolytic tank, the height of the hydrolytic sludge layer is adjustable, and the hydrolytic sludge layer is internally provided with dominant facultative anaerobes.

Further, the anaerobic unit further comprises an anaerobic sedimentation tank, the anaerobic sedimentation tank is arranged between the UASB tank and the aerobic tank, and sludge precipitated in the anaerobic sedimentation tank can flow back into the UASB tank.

Further, the aerobic unit further comprises a BAF pool, and the BAF pool is arranged between the aerobic pool and the ozone contact pool.

Further, the aerobic unit further comprises a secondary sedimentation tank, the secondary sedimentation tank is arranged between the BAF tank and the aerobic tank, and sludge precipitated in the secondary sedimentation tank can flow back into the hydrolysis tank.

Further, the ozone catalytic oxidation unit further comprises a sand filtering device, and the sand filtering device is arranged between the BAF tank and the ozone contact tank.

Further, the maleic anhydride wastewater treatment device also comprises a pretreatment unit, wherein the pretreatment unit comprises a heat exchanger, and a water outlet of the heat exchanger is communicated with the water distributor.

Further, the pretreatment unit also comprises an adjusting tank, the pH value of the maleic anhydride wastewater can be adjusted by the adjusting tank, and the water outlet of the adjusting tank is communicated with the water inlet of the heat exchanger.

Further, the pretreatment unit further comprises an air floatation tank, and a water outlet of the air floatation tank is communicated with a water inlet of the adjusting tank.

The beneficial effects of the utility model are as follows:

the utility model provides a maleic anhydride wastewater treatment device which comprises an anaerobic unit, an aerobic unit and an ozone catalytic oxidation unit, wherein the anaerobic unit comprises a hydrolysis tank, a water distributor and a UASB tank, the water distributor is arranged in the hydrolysis tank and communicated with the UASB tank, the water distributor can distribute water from the bottom of the tank after the pretreated maleic anhydride wastewater is pressurized, the hydrolysis tank is internally provided with dominant facultative anaerobes, one or more dominant facultative anaerobes, hydrogen-producing acetogenic bacteria and methane bacteria are arranged in the UASB tank, the aerobic unit comprises an aerobic tank, the aerobic tank can be communicated with the UASB tank, the ozone catalytic oxidation unit comprises an ozone contact tank, ozone can be uniformly distributed in ozone contact Chi Naneng, a water inlet of the ozone contact tank can be communicated with the aerobic tank, and a water outlet of the ozone contact tank is configured to be communicated with a discharge area. The anaerobic section of the maleic anhydride wastewater adopts a serial connection method of hydrolysis and UASB, so that the biodegradability of the maleic anhydride wastewater can be improved, the organic matters in the maleic anhydride wastewater can be effectively removed by the aerobic unit, and the Chemical Oxygen Demand (COD) in the maleic anhydride wastewater can be reduced under the oxidation of the ozone catalytic oxidation unit, so that the emission standard can be reached. The sewage treatment mode of the biochemical method simplifies the operation steps, reduces the treatment cost and reaches the emission standard.

Drawings

FIG. 1 is a schematic structural view of a maleic anhydride wastewater treatment device provided by an embodiment of the utility model;

fig. 2 is a schematic process flow diagram of a sewage treatment method according to an embodiment of the present utility model.

In the figure:

1-a pretreatment unit; a 2-anaerobic unit; 3-an aerobic unit; a 4-ozone catalytic oxidation unit; 5-a discharge zone;

11-an oil separation tank; 12-an air floatation tank; 13-an adjusting tank; 14-a heat exchanger; 21-a hydrolysis tank; 22-a water distributor; a 23-UASB pool; 24-an anaerobic sedimentation tank; 31-an aerobic tank; 32-a secondary sedimentation tank; 33-BAF pool; 41-an ozone contact tank; 42-sand filtering device;

211-hydrolyzing a sludge layer; 212-hydrolysis mud inlet; 221-a pressure distribution tank; 222-a water distribution pipe; 223-water outlet head; 231-anaerobic sludge inlet; 232-anaerobic sludge blanket; 241-anaerobic sludge return port; 311-an aerobic sludge layer; 321-hydrolysis back to the mud port.

Detailed Description

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the present utility model, directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for convenience of understanding, and thus do not limit the scope of the present utility model unless otherwise specified.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the present embodiment provides a treatment apparatus for maleic anhydride wastewater, the treatment apparatus for maleic anhydride wastewater comprises an anaerobic unit 2, an aerobic unit 3 and an ozone catalytic oxidation unit 4, the anaerobic unit 2 comprises a hydrolysis tank 21, a water distributor 22 and a UASB tank 23, the water distributor 22 is arranged in the hydrolysis tank 21, the hydrolysis tank 21 is communicated with the UASB tank 23, the water distributor 22 can distribute water from the bottom of the tank after pressurizing the pretreated maleic anhydride wastewater, one or more of dominant facultative anaerobes, dominant hydrogen-producing acetic acid-producing bacteria and methane bacteria are arranged in the hydrolysis tank 21, the UASB tank 23 is provided with one or more of dominant facultative anaerobes, the aerobic unit 3 comprises an aerobic tank 31, the aerobic tank 31 can be communicated with the UASB tank 23, the ozone catalytic oxidation unit 4 comprises an ozone contact tank 41, ozone can be uniformly distributed in the ozone contact tank 41, a water inlet of the ozone contact tank 41 can be communicated with the aerobic tank 31, and a water outlet of the ozone contact tank 41 is configured to be communicated with a discharge zone 5. The anaerobic section of the maleic anhydride wastewater adopts a serial connection method of hydrolysis and UASB, so that the biodegradability of the maleic anhydride wastewater can be improved, the organic matters in the maleic anhydride wastewater can be effectively removed by the aerobic unit 3, and the chemical oxygen demand COD in the maleic anhydride wastewater can be reduced under the oxidation of the ozone catalytic oxidation unit 4, so that the emission standard can be reached. The sewage treatment mode of the biochemical method simplifies the operation steps, reduces the treatment cost and reaches the emission standard.

Further, a double-layer hydrolyzed sludge layer 211 is arranged in the hydrolysis tank 21, the height of the hydrolyzed sludge layer 211 is adjustable, and the hydrolyzed sludge layer 211 is internally provided with dominant facultative anaerobes. The facultative anaerobe is in the first two stages of anaerobic degradation, and can decompose macromolecular organic matters in maleic anhydride wastewater into micromolecular organic matters, and simultaneously produce acid and basically produce no gas.

Specifically, the hydrolyzed sludge layer 211 is a double layer, the bottom layer is common sludge, and the common sludge has only biochemical treatment effect, and the pretreated maleic anhydride wastewater is sprayed upwards from the bottom of the tank by the water distributor 22, so that the sludge on the upper layer is in a suspension state, and can adsorb and intercept macromolecular organic matters.

The two-layer design of the hydrolyzed sludge layer 211 is realized by two sets of sludge feeding and discharging systems.

Further, the height of the hydrolyzed sludge layer 211 is adjustable, which can be achieved by controlling the sludge discharge and feed rates. The sludge height of the hydrolyzed sludge layer 211 needs to be empirically set, and if the sludge height of the hydrolyzed sludge layer 211 is too large, the sludge easily goes out of the hydrolysis tank 21, and if the sludge height of the hydrolyzed sludge layer 211 is too small, the interception and adsorption effects are poor.

Specifically, in the double-layered hydrolyzed sludge layer 211, the height of the bottom sludge is controlled to be about 20cm, the height of the upper sludge is controlled to be 2m-4m, and the distance from the bottom of the tank is 20cm.

Further, a double-layer anaerobic sludge layer 232 is arranged in the UASB tank 23, the height of the anaerobic sludge layer 232 is adjustable, and one or more of dominant facultative anaerobes, hydrogen-producing acetogenic bacteria and methane bacteria are arranged in the anaerobic sludge layer 232. The facultative anaerobe, hydrogen-producing acetogenic bacteria and methanobacteria are all in the latter two stages of anaerobic degradation, which can further decompose small molecular organics and acids. The microorganisms in the hydrolysis tank 21 and the UASB tank 23 each have a tendency to anaerobically degrade at different stages and thus act differently.

In this embodiment, the anaerobic sludge layer 232 has the same structure as the hydrolyzed sludge layer 211.

In this embodiment, the UASB tank 23 is an upflow anaerobic sludge blanket (Up-flow Anaerobic Sludge Bed), which is one of anaerobic biological treatment reactors, and has the dual characteristics of anaerobic filtration and anaerobic activated sludge process, and has the advantages of relatively simple structure, operation, maintenance and management, and relatively low cost.

Further, the water distributor 22 comprises a pressure water distribution tank 221 and a water outlet head 223, the water outlet head 223 is arranged at the bottom of the hydrolysis tank 21, the pressure water distribution tank 221 can pressurize pretreated maleic anhydride wastewater, and a water outlet of the pressure water distribution tank 221 is communicated with the water outlet head 223.

Further, the water distributor 22 further comprises a water distribution pipe 222, one end of the water distribution pipe 222 is connected with the pressure water distribution tank 221, and the other end is connected with the water outlet head 223.

In this embodiment, the water distributor 22 is a water distributor developed by a company (see patent number CN207259232U for details, and patent name is a water distributor of a hydrolysis tank). Compared with a water distributor on the market, the water distributor can pressurize water and then spray the water, so that the pressure deficiency caused by gravity water distribution is avoided, the stirring power of the hydrolyzed sludge layer 211 is enhanced, and the treatment effect of maleic anhydride wastewater is further improved.

Further, in order to enhance the effect of treating maleic anhydride wastewater, the water distributor 22 is also provided in the UASB tank 23.

Further, the anaerobic unit 2 further includes an anaerobic sedimentation tank 24, the anaerobic sedimentation tank 24 is disposed between the UASB tank 23 and the aerobic tank 31, and sludge precipitated in the anaerobic sedimentation tank 24 can flow back into the UASB tank 23.

Further, an anaerobic sludge return port 241 is arranged on the anaerobic sedimentation tank 24, an anaerobic sludge inlet 231 is arranged on the UASB tank 23, and the anaerobic sludge return port 241 is communicated with the anaerobic sludge inlet 231.

Further, the sludge returned from the anaerobic sedimentation tank 24 is anaerobic sludge, and is used for the sludge replenishment of the UASB tank 23 and for guaranteeing the rising flow rate of the inlet water, thereby guaranteeing the formation of the suspended anaerobic sludge layer 232.

Further, the aerobic unit 3 further includes a BAF tank 33, and the BAF tank 33 is disposed between the aerobic tank 31 and the ozone contact tank 41. The aerobic section of the maleic anhydride wastewater adopts a serial connection method of oxidation and BAF, so that organic matters in the maleic anhydride wastewater can be effectively removed.

In this embodiment, the BAF tank 33 is a biological aerated filter (Biological Aerated Filter) which can be used for denitrification and dephosphorization.

Specifically, the BAF tank 33 has a filler, and microorganisms can grow on the filler to further decompose organic substances. Meanwhile, the filler has an interception function on the residual sludge of the effluent of the aerobic tank 31 and suspended matters with larger particle sizes, so that the subsequent effluent is ensured.

Further, the aerobic unit 3 further comprises a secondary sedimentation tank 32, the secondary sedimentation tank 32 is arranged between the BAF tank 33 and the aerobic tank 31, and sludge precipitated in the secondary sedimentation tank 32 can flow back into the hydrolysis tank 21.

Further, a hydrolysis sludge return port 321 is arranged on the secondary sedimentation tank 32, a hydrolysis sludge inlet 212 is arranged on the hydrolysis tank 21, and the hydrolysis sludge return port 321 is communicated with the hydrolysis sludge inlet 212.

Further, an aerobic sludge layer 311 is arranged in the aerobic tank 31, and aerobic bacteria are arranged in the aerobic sludge layer 311, so that oxidation is facilitated.

In this embodiment, anaerobic bacteria and aerobic bacteria are all arranged in the sludge in each treatment tank, and after parameters such as temperature and oxygen amount of the treatment tanks are controlled, a certain flora in the sludge takes a dominant position, so that different treatment stages of maleic anhydride wastewater are realized.

Specifically, the externally-guided sludge is firstly placed in the aerobic tank 31 for culture, after the culture is qualified, part of the sludge flows into the secondary sedimentation tank 32 and flows back into the hydrolysis tank 21 through the sludge, and the sludge backflow is used as a starting mechanism of the hydrolysis tank 21. Before the maleic anhydride wastewater is treated, the hydrolysis tank 21 is started by the sludge reflux in the secondary sedimentation tank 32 without sludge in the hydrolysis tank 21, and of course, when the sludge in the hydrolysis tank 21 is reduced, the sludge can be supplemented by the sludge reflux for culturing the microorganism strain in the hydrolysis tank 21.

In the embodiment, the aerobic tank 31 is only a common oxidation tank, so that the cost is low, the treatment effect is good, and the removal rate of Chemical Oxygen Demand (COD) reaches more than 80%.

Further, the ozone catalytic oxidation unit 4 further includes a sand filter device 42, and the sand filter device 42 is disposed between the BAF tank 33 and the ozone contact tank 41. Maleic anhydride wastewater enters a sand filter device 42 from the BAF tank 33, enters an ozone contact tank 41 after passing through the sand filter device 42, and further reduces Chemical Oxygen Demand (COD) under the contact oxidation of ozone, and finally reaches the effluent standard (emission standard).

Further, the maleic anhydride wastewater treatment device also comprises a pretreatment unit 1, wherein the pretreatment unit 1 comprises a heat exchanger 14, and a water outlet of the heat exchanger 14 is communicated with a water distributor 22. Specifically, the water outlet of the heat exchanger 14 communicates with the pressure distribution tank 221.

Further, the pretreatment unit 1 further comprises an adjusting tank 13, the adjusting tank 13 can adjust the pH value of maleic anhydride wastewater, and the water outlet of the adjusting tank 13 is communicated with the water inlet of the heat exchanger 14.

Specifically, the maleic anhydride wastewater is firstly subjected to pH value adjustment through the adjusting tank 13, and then the temperature is adjusted through the heat exchanger 14, so that the heat exchanger 14 is prevented from acid corrosion, and the service life of the heat exchanger 14 is prolonged.

Further, the pretreatment unit 1 further comprises an air floatation tank 12, and a water outlet of the air floatation tank 12 is communicated with a water inlet of the regulating tank 13. If maleic anhydride wastewater directly enters the hydrolysis tank 21 without passing through the air floatation tank 12, the oil content of the water entering the hydrolysis tank 21 is high, and the proceeding of decomposing macromolecular organic matters is affected.

Further, the pretreatment unit 1 further comprises an oil separation tank 11, a water inlet of the oil separation tank 11 is communicated with maleic anhydride wastewater to be treated, and a water outlet of the oil separation tank 11 is communicated with a water inlet of the air floatation tank 12.

As shown in fig. 2, this embodiment also provides a sewage treatment method using the treatment device for maleic anhydride wastewater, which includes the following steps:

pretreating maleic anhydride wastewater;

anaerobic treatment by an anaerobic unit 2: the pretreated maleic anhydride wastewater enters a water distributor 22 for pressurization, the pressurized maleic anhydride wastewater is distributed from the bottom of a hydrolysis tank 21 and is subjected to biochemical hydrolysis, and the biochemical hydrolyzed maleic anhydride wastewater enters a UASB tank 23 for further anaerobic treatment;

and (3) carrying out aerobic treatment by an aerobic unit 3: the maleic anhydride wastewater subjected to further anaerobic treatment by the UASB tank 23 enters an aerobic tank 31 for aerobic treatment;

ozone catalytic oxidation treatment is carried out by an ozone catalytic oxidation unit 4: the maleic anhydride wastewater after the aerobic treatment in the aerobic tank 31 enters the ozone contact tank 41 to be subjected to ozone catalytic oxidation treatment, and is then discharged to the discharge area 5.

Further, the maleic anhydride wastewater is pretreated, and the method specifically comprises the following steps:

removing suspended oil from maleic anhydride wastewater by oil separation;

removing the maleic anhydride wastewater of suspended oil, and flocculating to remove macromolecular colloid;

and (5) sequentially carrying out pH adjustment and temperature adjustment on the flocculated maleic anhydride wastewater.

Further, maleic anhydride wastewater first enters an oil separation tank 11 for oil separation to remove suspended oil.

Further, maleic anhydride wastewater from which suspended oil is removed enters the floatation tank 12, and macromolecular colloid is removed by flocculation. Specifically, PAC (polyaluminum chloride, a flocculant) and PAM agents (cpolyacrylic amides, polyacrylamide, PAM for short, a flocculant) may be added to the floatation tank 12, and the small-molecule suspended substances and oils may be flocculated into a large-molecule colloid for removal.

Further, the flocculated maleic anhydride wastewater enters an adjusting tank 13 to adjust the pH value. Specifically, the acidic flocculated maleic anhydride wastewater is adjusted to a pH value of about 8.4 by adding an alkali solution into the adjustment tank 13.

Further, the maleic anhydride wastewater with the pH value adjusted enters the heat exchanger 14, the temperature of the maleic anhydride wastewater is stabilized at about 34 ℃, and then the maleic anhydride wastewater enters the hydrolysis tank 21 through the water distributor 22, and the rising flow rate of the maleic anhydride wastewater in the hydrolysis tank 21 is 1.2m/h.

Further, a height-adjustable expanded hydrolyzed sludge layer 211 is arranged in the hydrolysis tank 21 to adsorb and intercept macromolecular organic matters in the pretreated maleic anhydride wastewater. The water is evenly distributed from the bottom of the hydrolysis tank 21 through the water distributor 22, so that a micro-expansion hydrolysis sludge layer 211 is formed upwards, and microorganisms in the micro-expansion hydrolysis sludge layer 211 can degrade macromolecular organic matters into micromolecular organic matters, can effectively adsorb suspended organic matters, and has double removal functions on the organic matters.

Further, the pH of the effluent from the hydrolysis tank 21 was 7 and the temperature was between 25℃and 35 ℃.

Further, maleic anhydride wastewater flows out of the hydrolysis tank 21, water is uniformly distributed from the bottom of the UASB tank 23 through water distributor 22, organic matters in the maleic anhydride wastewater are further decomposed and removed under the action of anaerobic sludge layer 232, a large amount of biogas, hydrogen sulfide and the like are generated and removed through a three-phase separator, and the removal rate of Chemical Oxygen Demand (COD) can reach 60%. The pH of the effluent from the UASB pond 23 was 7.2 at a temperature between 30 ℃ and 35 ℃ and then enters the anaerobic precipitation pond 24 for precipitation.

Further, the maleic anhydride wastewater precipitated by the anaerobic precipitation tank 24 enters the aerobic tank 31, the hydraulic retention time is 50h, and the COD removal rate of the chemical oxygen demand can reach 80%. The pH value of the effluent of the aerobic tank 31 is 7, the temperature is between 15 ℃ and 20 ℃, and then the effluent enters a secondary sedimentation tank 32 for secondary sedimentation.

Further, the maleic anhydride wastewater re-precipitated in the secondary sedimentation tank 32 enters the BAF tank 33, organic matters and suspended matters are further removed under the action of the oxidative decomposition of microorganisms in the BAF tank 33 and the adsorption and interception of filter materials, the removal rate of chemical oxygen demand COD reaches 20%, and then the maleic anhydride wastewater enters the sand filtering device 42.

Further, after sand filtration treatment by the sand filtration device 42, the wastewater enters the ozone contact tank 41, and hydroxyl radicals which can be formed in water by utilizing ozone have an oxidation potential of 2.83V, so that refractory organic matters can be directly oxidized into carbon dioxide and water without selectivity.

In this embodiment, the scum and the floating oil in the oil separation tank 11 and the air floating tank 12 are collected and then treated separately, and the sludge generated by other units in the maleic anhydride wastewater treatment device is concentrated in a sludge concentration tank and then enters a sludge system for treatment.

While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims (10)

1. A maleic anhydride wastewater treatment device, comprising:

the anaerobic unit (2) comprises a hydrolysis tank (21), a water distributor (22) and a UASB tank (23), wherein the water distributor (22) is arranged in the hydrolysis tank (21), the hydrolysis tank (21) is communicated with the UASB tank (23), the water distributor (22) can distribute water from the bottom of the tank after the pretreated maleic anhydride wastewater is pressurized, the hydrolysis tank (21) is internally provided with dominant facultative anaerobes, and the UASB tank (23) is internally provided with one or more of dominant facultative anaerobes, hydrogen-producing acetic acid bacteria and methane bacteria;

an aerobic unit (3) comprising an aerobic tank (31), the aerobic tank (31) being capable of communicating with the UASB tank (23);

ozone catalytic oxidation unit (4), it includes ozone contact tank (41), ozone can be evenly distributed in ozone contact tank (41), the water inlet of ozone contact tank (41) can with good oxygen pond (31) intercommunication, the delivery port of ozone contact tank (41) is configured to can communicate with emission district (5).

2. The maleic anhydride wastewater treatment device according to claim 1, wherein the water distributor (22) comprises a pressure water distribution tank (221) and a water outlet head (223), the water outlet head (223) is arranged at the bottom of the hydrolysis tank (21), the pressure water distribution tank (221) can pressurize pretreated maleic anhydride wastewater, and a water outlet of the pressure water distribution tank (221) is communicated with the water outlet head (223).

3. The maleic anhydride wastewater treatment device according to claim 1, wherein a double-layer hydrolyzed sludge layer (211) is arranged in the hydrolysis tank (21), the height of the hydrolyzed sludge layer (211) is adjustable, and a dominant facultative anaerobe is arranged in the hydrolyzed sludge layer (211).

4. The maleic anhydride wastewater treatment device according to claim 1, wherein the anaerobic unit (2) further comprises an anaerobic sedimentation tank (24), the anaerobic sedimentation tank (24) is arranged between the UASB tank (23) and the aerobic tank (31), and sludge precipitated in the anaerobic sedimentation tank (24) can flow back into the UASB tank (23).

5. The maleic anhydride wastewater treatment device according to claim 1, characterized in that the aerobic unit (3) further comprises a BAF tank (33), the BAF tank (33) being arranged between the aerobic tank (31) and the ozone contact tank (41).

6. The maleic anhydride wastewater treatment device according to claim 5, characterized in that the aerobic unit (3) further comprises a secondary sedimentation tank (32), the secondary sedimentation tank (32) is arranged between the BAF tank (33) and the aerobic tank (31), and sludge precipitated in the secondary sedimentation tank (32) can flow back into the hydrolysis tank (21).

7. The maleic anhydride wastewater treatment device according to claim 5, characterized in that the ozone catalytic oxidation unit (4) further comprises a sand filter device (42), the sand filter device (42) being arranged between the BAF tank (33) and the ozone contact tank (41).

8. The maleic anhydride wastewater treatment device according to claim 1, further comprising a pretreatment unit (1), wherein the pretreatment unit (1) comprises a heat exchanger (14), and a water outlet of the heat exchanger (14) is communicated with the water distributor (22).

9. The maleic anhydride wastewater treatment device according to claim 8, characterized in that the pretreatment unit (1) further comprises an adjusting tank (13), the adjusting tank (13) being capable of adjusting the pH value of the maleic anhydride wastewater, the water outlet of the adjusting tank (13) being in communication with the water inlet of the heat exchanger (14).

10. The maleic anhydride wastewater treatment device according to claim 9, characterized in that the pretreatment unit (1) further comprises an air floatation tank (12), and the water outlet of the air floatation tank (12) is communicated with the water inlet of the regulating tank (13).

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