WO2021017366A1

WO2021017366A1 - Advanced wastewater treatment device based on ozone reactor and biomembrane granular sludge reactor

Info

Publication number: WO2021017366A1
Application number: PCT/CN2019/124744
Authority: WO
Inventors: 雷利荣; 蔡方瑞; 李友明
Original assignee: 华南理工大学
Priority date: 2019-07-31
Filing date: 2019-12-12
Publication date: 2021-02-04
Also published as: CN110451718A

Abstract

An advanced wastewater treatment device based on an ozone reactor (23) and a biomembrane granular sludge reactor, comprising a water collection tank (21), an ozone reactor (23), a balance adjusting tank (27), a first water pump (22), a second water pump (26), a third water pump (28), a sequencing batch biomembrane granular sludge expanded bed reactor, and a wastewater reuse treatment device. The water collection tank (21) is connected to the ozone reactor (23) by means of the first water pump (22). The ozone reactor (23) is connected to the balance adjusting tank (27) by means of the second water pump (26). The balance adjusting tank (27) is connected to the sequencing batch biomembrane granular sludge expanded bed reactor by means of the third water pump (28). The wastewater reuse treatment device comprises a first water tank (31), a second water tank (34), a third water tank (37), a fourth water tank (32), a fifth water tank (35), a sixth water tank (38), a multi-medium filter (33), an ultrafiltration membrane system (36), and a reverse osmosis membrane system (39). By using the synergistic effect of ozone catalytic oxidation and biological treatment of the biomembrane granular sludge reactor, the device enhances the effect of degrading and removing degradation-resistant organic pollutants in wastewater, the processing costs are reduced, and the efficiency of advanced wastewater treatment is improved.

Description

Wastewater advanced treatment device based on ozone and biofilm granular sludge reactor

Technical field

The invention relates to the technical field of advanced wastewater treatment, in particular to an advanced wastewater treatment device based on ozone and a biofilm granular sludge reactor.

Background technique

With the continuous improvement of environmental protection standards, in the modern industrial wastewater treatment process, many industrial wastewater cannot meet the discharge standard after secondary biological treatment, and further advanced treatment is necessary. For example, papermaking wastewater contains a certain concentration of wood. After the secondary biological treatment, the degradation products still contain relatively high concentrations of organic pollutants, which cannot meet the national emission standards and must be further processed to reduce the impact on the environment.

Fenton oxidation technology is currently one of the effective ways to degrade and remove difficult-to-degrade organics in wastewater. First, under acidic conditions, ferrous ions catalyze the decomposition of hydrogen peroxide to produce hydroxyl free radicals. Through the oxidative degradation of hydroxyl free radicals, organic pollution in the mineralized wastewater Then adjust the pH value of the reaction system to medium or alkaline, iron ions generate iron salt precipitation flocs, and remove organic pollutants, suspended solids and other pollutants in the wastewater through adsorption, coagulation, and precipitation. However, Fenton oxidation technology has the problems of large amount of chemicals and high treatment cost, and a large amount of iron-containing chemical sludge is produced during the treatment process, which becomes an obstacle to the further promotion and application of Fenton oxidation technology. On the other hand, non-process ions are another obstacle to the recycling of industrial wastewater. It is necessary to find an effective method to separate and remove soluble ions, organic matter, bacteria, colloidal particles, particles and other pollutants in wastewater, so that wastewater can be reused. Requirements.

Summary of the invention

In order to overcome the defects and deficiencies in the prior art, the present invention provides an advanced wastewater treatment device based on ozone and biofilm granular sludge reactors. The present invention enhances the degradation and removal effect of refractory organic pollutants in wastewater, and significantly The treatment cost is reduced, and the efficiency of advanced wastewater treatment is effectively improved.

In order to achieve the above objective, the present invention adopts the following technical solutions:

The present invention provides a wastewater advanced treatment device based on ozone and biofilm granular sludge reactor, which includes: a collection tank, an ozone reactor, a balance adjustment tank, a first water pump, a second water pump, a third water pump and a sequencing batch biological system Membrane granular sludge expanded bed reactor;

The water outlet of the sump is connected to the water inlet of the ozone reactor through the first water pump, and the water outlet of the ozone reactor is connected to the water inlet of the equalizing adjustment tank through the second water pump, and the water outlet of the equalizing adjustment tank passes through The third water pump is connected with the water inlet of the expanded bed reactor of the sequencing batch type biofilm granular sludge.

As a preferred technical solution, the sequencing batch biofilm granular sludge expanded bed reactor is provided with: water inlet, support plate, biological carrier bed, limit plate, water distribution system, air distribution system, water distribution device, aerator Air system, first blower, second blower, circulating water inlet pump and circulating water outlet;

The water inlet is connected with the water outlet of the third water pump, the biological carrier bed is arranged on a supporting plate, the biological carrier bed is arranged with biological carriers, the interval between the biological carrier bed and the limiting plate forms an expansion space, and the cloth The air system is connected to the first blower, the water distributor is installed on the support plate, the aeration system is connected to the second blower, the circulating water outlet is connected to the water inlet of the circulating water inlet pump, and the water distributing system is connected to Connect the outlet of the circulating water pump.

As a preferred technical solution, the volume of the expansion space is set to 1/50-1/20 of the volume of the biological carrier bed.

As a preferred technical solution, the inner circle of the biological carrier is provided with granular sludge, the outer circle is provided with a biofilm, and the inner circle is provided with partition bars.

As a preferred technical solution, the biological carrier adopts a hollow particle filler with a density of less than 1 g/cm ³ , a specific surface area greater than 500 m ² /m ³ and a porosity between 60% and 85%.

As a preferred technical solution, the support plate adopts a perforated plate, and water distributors are evenly distributed on the through holes of the support plate, and the waste water is evenly distributed along the vertical cross section of the water flow after passing through the water distributor and reacts through the biofilm particle sludge. Zone, the biofilm granular sludge reaction zone is equipped with a biological carrier, the limiting plate adopts a porous plate, the waste water enters the circulation return zone from the biofilm granular sludge reaction zone through the through holes on the limiting plate, and the limiting plate The size of the through hole is smaller than the size of the biological carrier.

As a preferred technical solution, the sequencing batch type biofilm granular sludge expanded bed reactor is also provided with a circulating aeration tank and a water outlet tank, and the water outlet tank is provided with a circulating return port, the circulating return port and the circulating aeration tank. Tank connection, the aeration system is arranged in the circulating aeration tank, and the circulating water outlet is arranged on the circulating aeration tank.

As a preferred technical solution, a wastewater reuse treatment device is also provided, including: a first pool, a second pool, a third pool, a fourth water pump, a fifth water pump, a sixth water pump, a multi-media filter, and an ultrafiltration membrane system And reverse osmosis system;

The sequencing batch type biofilm granular sludge expanded bed reactor is provided with a drain port connected with the water inlet of the first pool, and the water outlet of the first pool is connected to the multi-media filter through a fourth water pump The water inlet is connected, the water outlet of the multi-media filter is connected with the water inlet of the second pool, and the water outlet of the second pool is connected with the water inlet of the ultrafiltration membrane system through the fifth water pump, the ultrafiltration membrane system The water outlet is connected with the water inlet of the third pool, and the water outlet of the third pool is connected with the reverse osmosis system through the sixth water pump.

As a preferred technical solution, the third pool is provided with a stirring device, a scale inhibitor and an antioxidant input port, and the ultrafiltration membrane treatment system and the reverse osmosis membrane treatment system are both provided with a cleaning liquid inlet.

As a preferred technical solution, the water collection tank is provided with a catalyst input port, the balance adjustment tank is provided with a nutrient salt and lye input port, the water collection tank and the balance adjustment tank are both equipped with a stirring device, and the ozone reactor A gas disperser and an ozone destroyer are arranged, the gas disperser is arranged at the bottom of the ozone reactor and connected with the gas inlet, and the ozone destroyer is arranged at the tail gas outlet of the ozone reactor.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) The present invention utilizes the synergistic effect of ozone catalytic oxidation and biological treatment of biofilm granular sludge reactor to greatly enhance the degradation and removal effect of refractory organic pollutants in wastewater, significantly reduce treatment costs, and effectively improve wastewater depth Processing efficiency.

(2) The sequencing batch biofilm granular sludge expanded bed reactor of the present invention has a high sludge concentration, and the biofilm granular sludge reactor biological carrier bed sludge concentration (TSS) reaches 20-45g/L, which is higher than the current commonly used The activated sludge method and the biofilm method of sludge concentration ensure that the wastewater treatment obtains good results.

(3) The biological carrier of the present invention is provided with granular sludge in the inner circle, biofilm in the outer circle, and partition bars in the inner circle. The formation of granular sludge is the main reason for the high sludge concentration in the reactor. The medium to high concentration granular sludge and biofilm ensure a good wastewater treatment effect.

(4) In the present invention, the biological treatment aeration system is set in a separate circulating aeration tank, which solves the problem that the biological treatment system is easy to block the aeration system, and the maintenance of the aeration system is convenient. At the same time, the circulating aeration system The pond has the function of diluting and equalizing water quality, which is beneficial to improve the efficiency of wastewater treatment.

(5) The sequencing batch type biofilm granular sludge expanded bed reactor of the present invention is simple and compact, highly efficient and flexible, and has strong adaptability.

(6) The sequencing batch type biofilm granular sludge expanded bed reactor of the present invention is equipped with an expansion space, so that the biological carrier in the biological carrier bed is in a micro-expansion state during the wastewater treatment process, which is beneficial to the wastewater in the biofilm granular sludge. The uniform distribution of the reaction zone and uniform treatment can effectively improve the efficiency of wastewater treatment.

Description of the drawings

Fig. 1 is a schematic structural diagram of a wastewater advanced treatment device based on ozone and biofilm granular sludge reactor of Example 1;

Figure 2 is a partial enlarged view of the biological carrier bed at I in Figure 1;

3 is a schematic diagram of the structure of the biological carrier of Example 1;

4 is a schematic diagram of the structure of the wastewater reuse treatment device of Embodiment 2;

5 is a schematic diagram of the structure of the biofilm granular sludge reactor of Example 3.

Among them, 1-biofilm granular sludge reactor, 2-circulating aeration tank, 3-backwashing drainage outlet, 4-first blower, 5-air distribution system, 6-water distribution system, 7-support plate, 8 -Water distributor, 9-biological carrier bed, 10-outlet, 11-expansion space, 12-limiting plate, 13-outlet tank, 14-circulation return port, 15-circulation water inlet pump, 16-water inlet, 17 -Second blower, 18-aeration system, 19-pipe, 20-circulation outlet, 21-sump, 22-first water pump, 23-ozone reactor, 24-gas disperser, 25-ozone destroyer, 26-Second water pump, 27-Balance adjustment tank, 28-Third water pump, 29-Granular sludge, 30-Biofilm, 31-First pool, 32-Fourth water pump, 33-Multi-media filter, 34- The second pool, 35-the fifth water pump, 36-ultrafiltration membrane system, 37-the third pool, 38-the sixth water pump, and 39-reverse osmosis membrane system.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Example 1

As shown in Figure 1, this embodiment provides a wastewater advanced treatment device based on ozone and biofilm particle sludge reactor, including: a collecting tank 21, an ozone reactor 23, a balance adjustment tank 27 and a batch type biofilm particle Sludge expanded bed reactor. Sequencing batch type biofilm granular sludge expanded bed reactor includes biofilm granular sludge reactor 1 and circulating aeration tank 2;

In this embodiment, the water outlet of the sump 21 is connected to the water inlet of the ozone reactor 23 through the first water pump 22, and the water outlet of the ozone reactor 23 is connected to the water inlet of the balance adjustment tank 27 through the second water pump 26. The reactor 23 is provided with a gas disperser 24, and an ozone destroyer 25 is provided on the tail gas pipeline;

In this embodiment, the sump and the balance adjustment tank are both equipped with stirring devices, and the water outlet of the balance adjustment tank 27 is connected to the water inlet 16 of the circulating aeration tank 2 through the third water pump 28;

In this embodiment, the biofilm granular sludge reactor 1 is provided with a water and gas distribution zone A, a biofilm granular sludge reaction zone B, and a circulation return zone C along the flow direction of the wastewater; Water system 6, air distribution system 5, water distributor 8 installed on support plate 7, said air distribution system 5 is connected to first blower 4 through pipes; said biofilm particle sludge reaction zone B includes support plate 7 , The biological carrier bed 9, the limiting plate 12, and the expansion space 11 between the biological carrier bed 9 and the limiting plate 12 arranged on the supporting plate 7; the circulating return zone C is provided with a water outlet trough 13 and a water outlet trough 13 A circulating return port 14 is provided, and the circulating return port 14 is connected to the circulating aeration tank 2 through a pipe 19;

In this embodiment, the support plate 7 adopts a perforated plate, and the through hole of the support plate 7 is provided with a water distributor 8 so that the waste water is evenly distributed along the vertical cross section of the water flow and passes through the biofilm particle sludge reaction zone; the limit plate 12 adopts Perforated plate, wastewater enters the circulation return zone from the biofilm particle sludge reaction zone through the through holes on the limiting plate 12, and the size of the through holes on the limiting plate 12 is smaller than the size of the biological carrier in the biofilm particle sludge reaction zone;

In this embodiment, the circulating aeration tank 2 is provided with an aeration system 18 and a circulating water outlet 20. The aeration system 18 is connected to the second blower 17 through a pipe. The circulating water outlet 20 is connected to the water inlet of the circulating water pump 15 through the pipe. Connection, the water outlet of the circulating water inlet pump 15 is connected to the water distribution system 6;

In this embodiment, the biofilm granular sludge reactor 1 is also provided with a backwash drain 3; the circulating aeration tank 2 is also provided with a water inlet 16 and a drain 10, and the circulating aeration tank 2 is provided with a water inlet 16 is connected to the outlet of the third water pump 28 through a pipeline;

In this embodiment, the minimum volume of the expansion space 11 is 0, and the maximum volume of the expansion space 11 is 1/10 of the volume of the biological carrier bed 9; the volume of the expansion space 11 in this embodiment is preferably set to 1 of the volume of the biological carrier bed 9 /50-1/20;

In this embodiment, the wastewater maintains a certain flow rate when passing through the biological carrier bed 9, so that the biological carrier in the biological carrier bed 9 is in a micro-expanded state. The expansion of the biological carrier can fill the entire space including the biological carrier bed 9 and the expansion space 11. Preferably, the flow rate is 1.5-15mm/s, and the biological carrier adopts hollow particle fillers with a density of less than 1 g/cm3, a specific surface area greater than 500m ² /m ³ and a porosity between 60% and 85%.

As shown in Figure 2, the biological carrier is in a micro-expansion state during the wastewater treatment process and is irregularly distributed in the biofilm granular sludge reaction zone B; as shown in Figure 3, the biological carrier is surrounded by granular sludge 29. A biofilm 30 is formed in the outer ring, and partitions are arranged in the inner ring. The granular sludge and biofilm are formed at the same time in the reactor. There are aerobic, facultative and anaerobic microbial communities in the granular sludge and biofilm. After the sludge domestication is completed, granular sludge is produced in the biological carrier, and biofilm is formed on the surface of the carrier. The formation of granular sludge is the main reason for the high concentration of sludge in the reactor. The high concentration of granular sludge and biofilm in the reactor Ensure good wastewater treatment effect.

In this embodiment, the advanced wastewater treatment method of the wastewater advanced treatment device based on ozone and biofilm granular sludge reactor is:

S1: Ozone pre-oxidation treatment:

Add hydrogen peroxide to the sump 21 as the ozone catalyst, and start the stirring device of the sump 21 to stir evenly, and then the secondary biological treatment effluent in the sump 21 (catalyst-added wastewater) enters the ozone reaction through the first water pump 22 After reaching a certain liquid level, stop the water inflow; then, the ozone/oxygen mixed gas from the ozone generation system is dispersed into the ozone reactor 23 through the gas disperser 24, and the wastewater in the ozone reactor 23 is pre-oxidized by ozone. After 20 minutes of ozone oxidation treatment, stop supplying ozone/oxygen mixed gas to the ozone reactor 23;

In this embodiment, the dosage of hydrogen peroxide is 0.20mmol/L, the wastewater is treated by secondary biological treatment of paper-making wastewater, the COD of wastewater is 147mg/L, the color is 67C.U., and the SS is 41mg/ L, the dosing amount of ozone is 120mg/L, after 20 minutes of catalytic ozone oxidation treatment, stop supplying ozone/oxygen mixed gas to the ozone reactor 23;

S2: Balanced regulation of wastewater:

The wastewater that has undergone ozone pre-oxidation treatment enters the balance adjustment tank 27 through the second water pump 26, and at the same time, adds nutrients and lye required for biological treatment to the balance adjustment tank 27, and mixes them evenly through a stirring device;

S3: Biochemical oxidation treatment of wastewater in the balance regulating tank 27:

1) Water inlet

The waste water in the balance adjustment tank 27 enters the circulating aeration tank 2 from the water inlet 16 through the third water pump 28, and at the same time, the circulating water inlet pump 15 is started, and the waste water in the circulating aeration tank 2 is transported to the circulating water inlet through the circulating water outlet 20 through the circulating water inlet pump 15 The water distribution system 6 enters the biofilm granular sludge reactor 1. When the biofilm granular sludge reactor 1 is full of wastewater and the wastewater in the circulating aeration tank 2 reaches a certain level, the water will stop;

2) Wastewater treatment and recycling

After the water intake is completed, start the second blower 17 to aerate the wastewater in the circulating aeration tank 2 through the aeration system 18;

The wastewater in the circulating aeration tank 2 is transported to the water distribution system 6 of the water distribution area A of the biofilm granular sludge reactor 1 through the circulation water outlet 20 through the circulation water inlet pump 15 and enters the water distribution area A, The wastewater in the water distribution zone A passes through the water distributor 8 on the support plate 7 and enters the biological carrier bed 9 of the biofilm granular sludge reaction zone B; the wastewater undergoes biochemical oxidation treatment in the biological carrier bed 9, and then passes through the limit plate 12 Enter the recirculation zone C;

The waste water in the circulating return zone C passes through the circulating return port 14 provided in the water outlet tank 13 and then enters the circulating aeration tank 2 through the pipe 19. The waste water in the circulating aeration tank 2 again passes through the circulating water inlet pump 15 through the biofilm granular sludge. The water and gas distribution zone A, the biofilm granular sludge reaction zone B and the circulation return zone C of the reactor 1 are used for wastewater treatment and circulation;

In this embodiment, the volume of the expansion space 11 of the biofilm granular sludge reactor 1 is set to 1/20 of the volume of the biological carrier bed 9, the flow rate of the wastewater in the biological carrier bed is 15mm/s, and the wastewater treatment cycle is 6h , Where the aeration operation time is 4h, the hypoxia operation time is 1h, and the dissolved oxygen concentration in the biofilm granular sludge reaction zone B during aeration operation is 4-5mg/L;

In this embodiment, during the process of wastewater treatment and circulation, the second blower 17 is stopped to supply air to the circulating aeration tank 2 for a period of time, so that the wastewater is treated and circulated under anoxic conditions;

3) Drain

After the wastewater has been treated for a certain period of time, stop the circulation of the inlet pump 15 and the second blower 17, and discharge 30% of the total wastewater in the biofilm granular sludge reactor 1 and the circulating aeration tank 2 through the drain port 10. After treatment, the COD, SS and chromaticity of the wastewater are 67mg/L, 12mg/L and 15C.U. respectively.

In this embodiment, after the wastewater is treated for a period of time, the biological carrier can be backwashed by the first blower 4 and the air distribution system 5, and the backwashed wastewater can be discharged from the reactor through the backwash drain 3.

In this embodiment, different wastewater treatment effects can be obtained by changing parameters such as the characteristics of the wastewater, the volume of the expansion space 11, the flow rate of the wastewater in the biological carrier bed, the aeration operation time and the anoxic operation time, as described below:

The COD of the wastewater to be treated is 165mg/L, the chromaticity is 90C.U., and the SS is 31mg/L. Based on the volume of the wastewater, the amount of hydrogen peroxide added is 0.2mmol/L, and the amount of ozone added is 120mg/L. The time is 20min; the volume of the expansion space 11 of the biofilm granular sludge reactor 1 is 1/40 of the volume of the biological carrier bed 9, the flow rate of the wastewater in the biological carrier bed is 8mm/s, and the wastewater treatment cycle is 6h. The aeration operation time is 4h, the hypoxia operation time is 1h, the dissolved oxygen concentration of the biofilm granular sludge reaction zone B during aeration operation is 4-5mg/L, and the treated wastewater COD, SS and color are 52mg/L respectively , 14mg/L and 18C.U.;

The COD of the wastewater to be treated is 165mg/L, the chromaticity is 90C.U., and the SS is 31mg/L. Based on the volume of the wastewater, the amount of hydrogen peroxide added is 0.2mmol/L, and the amount of ozone added is 120mg/L. The time is 20min; the volume of the expansion space 11 of the biofilm granular sludge reactor 1 is 1/50 of the volume of the biological carrier bed 9, the flow rate of the wastewater in the biological carrier bed is 1.5mm/s, and the wastewater treatment cycle is 6h. The aeration operation time is 4.5h, the hypoxia operation time is 0.5h, the dissolved oxygen concentration in the biofilm particle sludge reaction zone B is 4-5mg/L during aeration operation, and the COD, SS and chromaticity of the wastewater after treatment are respectively 42mg/L, 10mg/L and 12C.U.

In this embodiment, the wastewater is first pre-oxidized by ozone/catalytic ozone to significantly improve the biodegradability of the refractory pollutants in the secondary biological treatment effluent, and then the wastewater is subjected to biological treatment, and the pollutants in the wastewater are further degraded and removed by biochemical oxidation. In this embodiment, a sequencing batch biofilm granular sludge expanded bed reactor with the advantages of high sludge concentration and low sludge yield is adopted, which greatly improves the efficiency of wastewater biological treatment and reduces treatment costs.

Example 2

The technical solution of this embodiment 2 is the same as that of embodiment 1 except for the following technical features:

This embodiment provides an advanced wastewater treatment device based on ozone and a biofilm granular sludge reactor. The discharge port of the sequencing batch biofilm granular sludge expanded bed reactor is also connected with a wastewater reuse treatment device. The treatment with the treatment device can further remove the non-process ions and other pollutants in the wastewater, so that the wastewater can meet the requirements of reuse;

As shown in Figure 4, in this embodiment, the wastewater reuse treatment device includes: a first pool, a multi-media filter, a second pool, an ultrafiltration membrane system, a third pool, and a reverse osmosis system. The third pool 37 is set There is a stirring device, and the ultrafiltration membrane treatment system 36 and the reverse osmosis membrane treatment system 39 are both equipped with a cleaning system, which uses acids, alkalis, and fungicides for regular cleaning.

In this embodiment, the water outlet 10 provided in the circulating aeration tank 2 is connected to the first pool 31 through a pipe, the multi-media filter 33 is provided with a water inlet and a water outlet; the water inlet provided by the multi-media filter 33 is connected to The water outlet of the fourth water pump 32 is connected, the water inlet of the fourth water pump 32 is connected to the first pool 31 through a pipe, and the water outlet provided by the multi-media filter 33 is connected to the second pool 34 through a pipe;

In this embodiment, the second pool 34 is connected to the water inlet of the fifth water pump 35 through a pipe, and the water outlet of the fifth water pump 35 is connected to the water inlet of the ultrafiltration membrane system 36 through a pipe. The filtrate outlet of 36 is connected to the third pool 37 through a pipe;

In this embodiment, the third pool 37 is connected to the water inlet of the sixth water pump 38 through a pipe, and the water outlet of the sixth water pump 38 is connected to the water inlet of the reverse osmosis membrane system 39 through a pipe. The filtrate of 39 is sent back to the water tank and used in the production process;

The wastewater treatment method of the advanced wastewater treatment device based on ozone and biofilm granular sludge reactor in this embodiment is:

S1: Ozone pre-oxidation treatment;

S2: Balanced adjustment of wastewater: the wastewater treated by ozone pre-oxidation enters the balance adjustment tank 27, and at the same time adds nutrients and lye needed for biological treatment to the balance adjustment tank 27, and mixes them evenly;

S3: The wastewater in the balance regulating tank 27 is subjected to biochemical oxidation treatment;

S4: Multi-media filtration: the wastewater in the first pool 31 is transported into the multi-media filter 33 through the fourth water pump 32, and the wastewater treated by the multi-media filter 33 enters the second pool 34;

S5: Ultrafiltration membrane treatment: the wastewater in the second pool 34 is transported into the ultrafiltration membrane system 36 through the fifth water pump 35, the filtrate treated by the ultrafiltration membrane system 36 enters the third pool 37, the ultrafiltration membrane treatment system 36 The concentrated liquid is returned to the sump 21 and mixed with the secondary biological treatment effluent for advanced treatment;

S6: Reverse osmosis membrane treatment: After the wastewater in the third pool 37 is evenly mixed with the added scale inhibitors and antioxidants, it is transported to the reverse osmosis membrane system 39 through the sixth water pump 38, and the filter treated by the reverse osmosis membrane system 39 The permeate is sent back to the water tank and reused in the production process. The concentrated liquid of the reverse osmosis membrane treatment system 39 is sent to the reverse osmosis concentrated liquid treatment system. After treatment, it reaches the discharge standard. After the reverse osmosis membrane treatment, the filtrate COD, SS and The chromaticity is 12mg/L, 3mg/L and 0C.U. respectively.

In this embodiment, the parameters such as the amount of hydrogen peroxide added, the amount of ozone added, the volume of the expansion space of the biofilm granular sludge reactor, the flow rate of the wastewater in the biological carrier bed, the aeration operation time and the anoxic operation time are changed , Can obtain different wastewater treatment effects, as follows:

Wastewater COD is 115mg/L, chromaticity is 25C.U., SS is 28mg/L, based on the volume of wastewater, the amount of hydrogen peroxide is 0.35mmol/L, the amount of ozone is 120mg/L, and the treatment time is 20min The volume of the expansion space 11 of the biofilm granular sludge reactor 1 is 1/50 of the volume of the biological carrier bed 9, the flow rate of wastewater in the biological carrier bed is 1.5mm/s, and the wastewater treatment cycle is 6h, in which the aeration operation The time is 4.5h, the anoxic operation time is 0.5h, the dissolved oxygen concentration in the biofilm granular sludge reaction zone B during aeration operation is 4-5mg/L, and the COD, SS and chromaticity of the reverse osmosis membrane filtrate after treatment Respectively 7mg/L, 1mg/L and 0C.U.;

Wastewater COD is 165mg/L, chromaticity is 90C.U., SS is 31mg/L, based on the volume of wastewater, the addition of hydrogen peroxide is 0.5mmol/L, the addition of ozone is 180mg/L, and the treatment time is 20min , The volume of the expansion space 11 of the biofilm granular sludge reactor 1 is 1/40 of the volume of the biological carrier bed 9, the flow rate of wastewater in the biological carrier bed is 8mm/s, and the wastewater treatment cycle is 6h, and the aeration operation time is 4h, anoxic operation time is 1h, the dissolved oxygen concentration of biofilm granular sludge reaction zone B during aeration operation is 4-5mg/L, after treatment the COD, SS and chromaticity of the reverse osmosis membrane filtrate are 15mg respectively /L, 4mg/L and 0C.U.

In this embodiment, the wastewater is first pre-oxidized by ozone/catalytic ozone to significantly improve the biodegradability of the refractory pollutants in the effluent from the secondary biological treatment. Then the wastewater is subjected to biological treatment, and the organic matter in the wastewater is further degraded and removed by biochemical oxidation. Pollutants, then, the wastewater is treated by a multi-media filter, ultrafiltration membrane system and reverse osmosis membrane system to further remove non-process ions and other pollutants in the wastewater, so that the wastewater can meet the requirements for reuse.

Example 3

The technical solution of this embodiment 3 is the same as that of embodiment 1 except for the following technical features:

As shown in Fig. 5, the biofilm granular sludge reactor can also adopt an integrated structure, and the aeration system is separately arranged in the circulation return zone C, which can also achieve the purpose of convenient maintenance.

The biofilm granular sludge reactor of this embodiment is sequentially provided with a water and gas distribution zone, a biofilm granular sludge reaction zone and a circulation return zone along the wastewater treatment flow direction;

Among them, the biofilm granular sludge reaction zone includes a supporting plate 7, a biological carrier bed 9, a limiting plate 12 and an expansion space 11. The biological carrier bed 9 is arranged on the supporting plate 7, and the distance between the biological carrier bed 9 and the limiting plate 12 An expansion space 11 is formed; the water distribution area is provided with a water distribution system 6, an air distribution system 5, a water distributor 8 and a first blower 4. The air distribution system 5 is connected to the first blower 4, and the water distributor 8 is installed on the support On the board 7; the circulating return zone is provided with an aeration system 18, a second blower 17, a circulating water inlet pump 15 and a circulating water outlet 20. The circulating water outlet 20 is connected to the water inlet of the circulating water pump 15, and the water distribution system 6 is connected to the circulating inlet The water outlet of the water pump 15 is connected, and the aeration system 18 is connected with the second blower 17.

The biofilm granular sludge reactor of this embodiment is also provided with a water inlet 16, a drain 10, and a backwash drain 3. In this embodiment, the water inlet 16 is provided in the circulating return zone C, the water inlet 16 and the third water pump 28 Connected, the drainage outlet is located in the biofilm particle sludge reaction zone B, and the backwashing drainage outlet is located in the water and gas distribution zone A.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, etc. made without departing from the spirit and principle of the present invention Simplified, all should be equivalent replacement methods, and they are all included in the protection scope of the present invention.

Claims

A wastewater advanced treatment device based on ozone and biofilm granular sludge reactor, which is characterized in that it comprises: a collection tank, an ozone reactor, a balance adjustment tank, a first water pump, a second water pump, a third water pump and a batch type Biofilm granular sludge expanded bed reactor;

The water outlet of the sump is connected to the water inlet of the ozone reactor through the first water pump, and the water outlet of the ozone reactor is connected to the water inlet of the equalizing adjustment tank through the second water pump, and the water outlet of the equalizing adjustment tank passes through The third water pump is connected with the water inlet of the expanded bed reactor of the sequencing batch type biofilm granular sludge.
The advanced wastewater treatment device based on ozone and biofilm granular sludge reactor according to claim 1, wherein the sequencing batch type biofilm granular sludge expanded bed reactor is provided with: a water inlet, a support plate, Biological carrier bed, limit plate, water distribution system, air distribution system, water distributor, aeration system, first blower, second blower, circulating water inlet pump and circulating water outlet;

The water inlet is connected to the water outlet of the third water pump, the biological carrier bed is arranged on a supporting plate, the biological carrier bed is arranged with biological carriers, the biological carriers are arranged irregularly, and the biological carrier bed is connected to the limiter. The space between the position plates forms an expansion space, the air distribution system is connected to the first blower, the water distributor is installed on the support plate, the aeration system is connected to the second blower, and the circulating water outlet is connected to the circulating water inlet pump The water inlet is connected, and the water distribution system is connected with the water outlet of the circulating water inlet pump.
The advanced wastewater treatment device based on ozone and biofilm granular sludge reactor according to claim 2, wherein the volume of the expansion space is set to 1/50-1/20 of the volume of the biological carrier bed.
The advanced wastewater treatment device based on ozone and biofilm granular sludge reactor according to claim 2, characterized in that the inner circle of the biological carrier is provided with granular sludge, the outer circle is provided with biofilm, and the inner circle is provided with granular sludge. There are dividers.
The advanced wastewater treatment device based on ozone and biofilm granular sludge reactor according to claim 2 or 4, wherein the biological carrier adopts a density of less than 1g/cm 3 , a specific surface area greater than 500m 2 /m 3 and Hollow particle filler with porosity between 60% and 85%.
The wastewater advanced treatment device based on ozone and biofilm granular sludge reactor according to claim 2, characterized in that the supporting plate is a porous plate, and water distributors are evenly distributed on the through holes of the supporting plate, After passing through the water distributor, the wastewater is evenly distributed along the vertical cross-section of the water flow and passes through the biofilm granular sludge reaction zone. The limiting plate adopts a porous plate, and the wastewater enters the biofilm granular sludge reaction zone through the through holes on the limiting plate. In the circulating return zone, the size of the through hole on the limiting plate is smaller than the size of the biological carrier.
The advanced wastewater treatment device based on ozone and biofilm granular sludge reactor according to claim 2, characterized in that, the sequencing batch type biofilm granular sludge expanded bed reactor is also provided with a circulating aeration tank and an outlet A water tank, the water outlet tank is provided with a circulation return port, the circulation return port is connected with a circulating aeration tank, the aeration system is arranged in the circulation aeration tank, and the circulation water outlet is arranged on the circulation aeration tank.
The wastewater advanced treatment device based on ozone and biofilm granular sludge reactor according to claim 1, characterized in that, a wastewater reuse treatment device is also provided, including: a first pool, a second pool, a third pool, The fourth water pump, fifth water pump, sixth water pump, multi-media filter, ultrafiltration membrane system and reverse osmosis system;

The sequencing batch type biofilm granular sludge expanded bed reactor is provided with a drain port connected with the water inlet of the first pool, and the water outlet of the first pool is connected to the multi-media filter through a fourth water pump The water inlet is connected, the water outlet of the multi-media filter is connected with the water inlet of the second pool, and the water outlet of the second pool is connected with the water inlet of the ultrafiltration membrane system through the fifth water pump, the ultrafiltration membrane system The water outlet is connected with the water inlet of the third pool, and the water outlet of the third pool is connected with the reverse osmosis system through the sixth water pump.
The wastewater advanced treatment device based on ozone and biofilm granular sludge reactor according to claim 8, wherein the third pool is provided with a stirring device, a scale inhibitor and an antioxidant input port, and the ultrafiltration Both the membrane treatment system and the reverse osmosis membrane treatment system are provided with a cleaning liquid inlet.
The device for advanced treatment of wastewater based on ozone and biofilm granular sludge reactor according to claim 1, wherein the collecting tank is provided with a catalyst input port, and the balance adjustment tank is provided with nutrients and lye input The sump and the balance adjustment tank are both equipped with stirring devices, the ozone reactor is equipped with a gas disperser and an ozone destroyer, and the gas disperser is arranged at the bottom of the ozone reactor and connected to the gas inlet. The ozone destroyer is arranged at the tail gas outlet of the ozone reactor.