CN114195332A - Deep treatment system and method capable of achieving surface water III-class water standard - Google Patents
Deep treatment system and method capable of achieving surface water III-class water standard Download PDFInfo
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- CN114195332A CN114195332A CN202111680975.XA CN202111680975A CN114195332A CN 114195332 A CN114195332 A CN 114195332A CN 202111680975 A CN202111680975 A CN 202111680975A CN 114195332 A CN114195332 A CN 114195332A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 50
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
Abstract
The invention discloses an advanced treatment system and method capable of reaching the III-class water standard of surface water, which comprises an intermediate water tank, wherein the intermediate water tank is used for collecting wastewater which is treated by a physicochemical treatment system and a biochemical treatment system and does not reach the III-class water standard of the surface water, an advanced treatment unit comprises a membrane treatment system and an advanced oxidation treatment system, the membrane treatment system comprises a multi-media filter, an ultrafiltration system and an RO reverse osmosis system, the advanced oxidation treatment system comprises a Fenton catalytic oxidation system, a neutralization degassing sedimentation tank, a denitrification deep bed filter tank and an aeration biological filter tank, and the effluent of the aeration biological filter tank and the RO reverse osmosis system enters a mixing tank to mix the concentrated water of the RO reverse osmosis system and returns to the biochemical treatment system.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an advanced treatment system and method capable of achieving the III-class water standard of surface water.
Background
With the increasing environmental awareness, the existing water treatment system can only reach the integrated wastewater discharge standard or the pollutant discharge standard of urban sewage treatment plants or the discharge standards of other industries after passing through a simple physicochemical treatment system and a biochemical treatment system. But does not meet the discharge requirements of the surface water class III standard. Therefore, it is necessary to add advanced treatment systems for further treatment to meet surface water class III standards.
The existing advanced treatment system mainly comprises a single membrane treatment system or a single Fenton catalytic oxidation system,
the system has the problem that although a single membrane treatment system can remove pollutants in the system, high-salinity concentrated water is continuously generated, and the current treatment methods of the high-salinity concentrated water include two methods, namely, the high-salinity concentrated water is collected and treated by a treatment mode such as distillation crystallization, and the cost is extremely high. The other is to return to the treatment system, but this way the salt is not always discharged in the system, eventually causing a problem of salt accumulation in the process system. The total nitrogen of a pure Fenton catalytic oxidation system can not meet the requirements of class III water quality of surface water quality standard.
Disclosure of Invention
Aiming at the problems in the prior art, the first purpose of the invention is to provide an advanced treatment system capable of meeting the III-class water standard of surface water, and the second purpose is to provide an advanced treatment method capable of meeting the III-class water standard of surface water.
In order to achieve the first object, the invention is realized by the following technical scheme: the utility model provides an ability reaches advanced treatment system of III types of water standards of surface water, includes middle pond for collect the waste water that does not reach III types of water standards of surface water after materialization processing system and biochemical treatment system handle, its characterized in that: the advanced treatment unit comprises a membrane treatment system and an advanced oxidation treatment system, the membrane treatment system comprises a multi-medium filter, an ultrafiltration system and an RO reverse osmosis system, the advanced oxidation treatment system comprises a Fenton catalytic oxidation system, a neutralization degassing sedimentation tank, a denitrification deep bed filter tank and an aeration biological filter tank, the water outlet pipe of the middle water tank is divided into two branches which are respectively connected with the multi-medium filter and the Fenton catalytic oxidation system, the effluent of the multi-medium filter enters an ultrafiltration system, the effluent of the ultrafiltration system enters an RO reverse osmosis system, the effluent of the Fenton catalytic oxidation system enters a neutralization degassing sedimentation tank, the water outlet of the neutralization degassing sedimentation tank is connected with a denitrification deep bed filter, the water outlet of the denitrification deep bed filter tank is connected with the biological aerated filter tank, and the outlet water of the biological aerated filter tank and the outlet water of the RO reverse osmosis system both enter the mixing tank and are mixed with the concentrated water of the RO reverse osmosis system to return to the biochemical treatment system.
The physical and chemical treatment system and the biochemical treatment system are conventional sewage and wastewater treatment processes, the physical and chemical treatment process is mainly as follows: grid interception, sand setting, water quality and water quantity regulation, oil removal, primary sedimentation, neutralization, oxidation reduction, coagulating sedimentation or air floatation and the like. And biochemical treatment including active sludge process, biomembrane process, membrane biological reaction, etc. The physicochemical treatment and the biochemical treatment of the industrial wastewater or the domestic sewage aim to remove most of pollutants such as floating oil, SS, COD, ammonia nitrogen, total phosphorus and the like in the wastewater or the sewage and obviously reduce the load in an advanced treatment stage.
In the scheme, the method comprises the following steps: and returning the concentrated water of the RO reverse osmosis system to a comprehensive regulating tank of the biochemical treatment system. After returning to the comprehensive regulating tank of the biochemical treatment system, the concentrated water is subjected to biochemical treatment and subsequent advanced treatment together with the process water.
In the scheme, the method comprises the following steps: and the water in the mixing pool is disinfected by the disinfection treatment unit and then is discharged by the metering discharge channel after reaching the standard.
In the scheme, the method comprises the following steps: the RO reverse osmosis treatment system can be two-stage or multi-stage reverse osmosis. When the quality of the waste water is poor, two-stage or multi-stage reverse osmosis can be adopted to remove pollutants.
The second object of the present invention is achieved by: an advanced treatment system capable of achieving the III-class water standard of surface water is characterized by comprising the following steps:
1) collecting the wastewater which is treated by the physicochemical treatment system and the biochemical treatment system and does not reach the III-class water standard of the surface water into an intermediate water tank;
2) the water in the middle water tank is divided into two parts which respectively enter a membrane treatment system and an advanced oxidation treatment system of the advanced treatment unit; in the membrane treatment system, firstly, pollutants such as SS and the like are removed through a multi-media filter, then the obtained product enters an ultrafiltration system, the process water meets the water quality requirement of RO reverse osmosis inlet water through ultrafiltration, then the obtained product is pumped into the RO reverse osmosis system, pollutants and salts are intercepted, concentrated water of the RO reverse osmosis system returns to a biochemical treatment system, and fresh water enters a mixing tank; in the advanced oxidation treatment system, wastewater is firstly subjected to Fenton catalytic oxidation to remove organic matters difficult to degrade, then enters a neutralization degassing precipitation process to carry out mud-water separation, a ferrous catalyst for Fenton reaction is oxidized to generate ferric iron, the ferric iron reacts with phosphate in process water to precipitate and remove total phosphorus, the total phosphorus passes through a denitrification deep bed filter to be added with a denitrification carbon source to remove total nitrogen, and finally the residual denitrification carbon source is removed through an aeration biological filter to enter a mixing tank to be mixed with fresh water from an RO reverse osmosis system.
2) And discharging the water in the mixing pool after the disinfection treatment.
In the scheme, the method comprises the following steps: the volume ratio of the wastewater entering the membrane treatment system to the wastewater entering the advanced oxidation treatment system is 50-90%: 50 to 10 percent.
In the scheme, the method comprises the following steps: when the concentration of pollutants is high and the quality of wastewater is poor, at least one of a neutralization degassing sedimentation tank, a denitrification deep bed filter and an aeration biological filter in the advanced oxidation treatment system can be two or more stages.
In the scheme, the method comprises the following steps: the wastewater passing through the physicochemical treatment system and the biochemical treatment system can reach the integrated wastewater discharge standard or the pollutant discharge standard of urban sewage treatment plants or the industrial discharge standard, but can not meet the III-class water standard of surface water.
According to the invention, the concentrated water (with high salt content) of the membrane treatment system is directly returned to the comprehensive regulating reservoir for secondary treatment, and then the salt is discharged through the high-level oxidation treatment system, and finally the concentrated water is mixed with the fresh water subjected to membrane treatment to reach the III-class standard of surface water quality standard, so that the problem of salt accumulation in the treatment system caused by a single ultrafiltration and RO membrane treatment process is solved, and compared with the prior art that the concentrated water is subjected to distillation crystallization treatment, the treatment cost is lower. Also solves the problem that the total nitrogen in the single Fenton + denitrification filter tank process can not reach the III-class water quality of the surface water quality standard.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings.
The waste water (sewage) referred to in the patent refers to waste water and sewage generated in the industries of agriculture, forestry, animal husbandry, fishery, mining, manufacturing, medical sanitation, environmental sanitation and the like which are classified according to the national economic industry (GB/T4754-2017), and also includes domestic sewage generated in the lives of residents in cities and towns and villages.
The water quality limits of class III of the water quality standard of surface water are as follows:
| name of contaminant | CODCr | BOD5 | NH3-N | TN | TP | Fecal coliform group |
| Concentration (mg/L) | 20 | 4.0 | 1.0 | 1.0 | 0.2 | 1.0X104Per L |
Example 1
The agriculture, forestry, animal husbandry and fishery take the treatment of livestock and poultry breeding wastewater as an example
As shown in figure 1, the advanced treatment system capable of reaching the III-class water standard of surface water consists of a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a disinfection treatment unit.
The pretreatment unit comprises a grid sand collecting and collecting tank 1, a foam manure wastewater collecting tank 2 and a solid-liquid separator 3 which are connected in sequence. The grid sand collecting and water collecting tank 1 collects the breeding wastewater, removes larger impurities, and then carries out solid-liquid separation through a solid-liquid separator.
The biochemical treatment unit comprises a primary sedimentation prehydrolysis tank 4, a pre-conditioning tank 5, an EGSB reactor 6, a comprehensive conditioning tank 7, a primary AO reaction tank 8, a secondary AO reaction tank 9, a secondary sedimentation tank 10, a coagulation tertiary sedimentation tank 11 and an intermediate water tank 12 which are connected in sequence.
The advanced treatment unit comprises a membrane treatment system and an advanced oxidation treatment system. The membrane treatment system comprises a multi-media filter 13, an ultrafiltration system 14 and an RO reverse osmosis system 15, the advanced oxidation treatment system comprises a Fenton catalytic oxidation system 16, a neutralization degassing sedimentation tank 17, a denitrification deep bed filter 18 and an aeration biological filter 19, a water outlet pipe of the middle water tank 12 is divided into two branches which are respectively connected with the multi-media filter 13 and the Fenton catalytic oxidation system 16, the effluent of the multi-media filter 13 enters the ultrafiltration system 14, the effluent of the ultrafiltration system 14 enters the RO reverse osmosis system 15, and the RO reverse osmosis system 15 can be a two-stage or multi-stage reverse osmosis system consisting of two or more reverse osmosis devices. The concentrated water of the RO reverse osmosis system 15 returns to the comprehensive regulating reservoir 7. The effluent of the Fenton catalytic oxidation system 16 enters a neutralization degassing sedimentation tank 17, alkali is added into the neutralization degassing sedimentation tank 17 for neutralization, the water outlet of the neutralization degassing sedimentation tank 17 is connected with a denitrification deep-bed filter 18, the water outlet of the denitrification deep-bed filter 18 is connected with an aeration biological filter 19, the effluent of the aeration biological filter 18 and the effluent of the RO reverse osmosis system 18 both enter a mixing tank 20, and the water from the mixing tank 20 enters a disinfection treatment unit.
The disinfection treatment unit comprises a mixing disinfection tank 21, and wastewater subjected to disinfection treatment is discharged through a metering discharge channel 22.
The water quality of the raw water of the general livestock and poultry breeding wastewater is as follows
| Name of contaminant | COD | NH3-N | TN | TP | SS | Fecal coliform group |
| Concentration (mg/L) | 3500 | 300 | 400 | 40 | 2000 | 1.0X107Per L |
Breed waste water gets into the pretreatment unit earlier and removes the sediment, and waste water after the sediment removal gets into and just sinks prehydrolysis pond and preconditioning tank regulation quality of water volume, then gets into the EGSB reactor and carries out anaerobic treatment, gets rid of COD, SS, BOD and most total nitrogen and ammonia nitrogen, then gets into the comprehensive conditioning tank and adjusts quality of water volume, passes through oxygen deficiency aerobic denitrification reaction to middle pond again, and the effect of water yield buffering and reposition of redundant personnel is played in the middle pond, and quality of water can reach the following:
| name of contaminant | COD | NH3-N | TN | TP | SS | Fecal coliform group |
| Concentration (mg/L) | 100 | 1.0 | 20 | 1.0 | 20 | 1.0X105Per L |
One part of the water in the middle water pool process is lifted by a pump to enter a membrane treatment system (the water content accounts for about 50-90 percent), and the other part of the water in the middle water pool process is lifted to enter an advanced oxidation treatment system (the water content accounts for about 10-50 percent). The water amount ratio is adjusted according to the salt content. When the concentrated water returns to the comprehensive adjusting tank, which causes the salt content in the process water to be higher, the proportion of the water going to the advanced oxidation treatment system can be properly increased within the proportion range, so that the salt discharge amount is increased.
The process water entering the membrane treatment system is treated by a multi-medium filtration process to remove pollutants such as SS and the like, and then enters an Ultrafiltration (UF) process to be treated, so that the process water reaches the water quality requirement of the inlet water of the RO reverse osmosis treatment system, and then enters the RO reverse osmosis treatment system under the pressure of a high-pressure pump, wherein the RO reverse osmosis treatment system has the function of intercepting most of pollutants and salts, the outlet water of the RO reverse osmosis treatment system is fresh water and concentrated solution, and the fresh water is purified water and enters a mixing tank. The concentrated solution flows back to the comprehensive adjusting tank for secondary treatment. Under the condition of worse water quality in the process, two-stage reverse osmosis or multi-stage reverse osmosis series operation can be used for improving the quality of fresh water.
The process water entering the advanced oxidation treatment system is subjected to Fenton catalytic oxidation to remove organic matters difficult to degrade, and then enters the neutralization, degassing and coagulating sedimentation processes to separate sludge and water, and simultaneously, a ferrous catalyst for Fenton reaction is oxidized to generate ferric iron which then reacts with phosphate in the process water to generate sediment, so that most of total phosphorus is removed. The process water enters a denitrification deep bed filter, total nitrogen pollutants are subjected to denitrification reaction in the deep bed filter under the condition of adding a denitrification carbon source, so that most of the total nitrogen pollutants are removed, the residual denitrification carbon source is removed through an aeration biological filter, the process water subjected to denitrification and decarbonization treatment enters a mixing tank, and the water-containing sludge generated by Fenton reaction enters a sludge dewatering system for dewatering and then is transported out for disposal.
And (3) uniformly mixing the effluent of the membrane treatment system and the effluent of the advanced oxidation treatment system in a mixing tank, then feeding the mixture into an ultraviolet disinfection tank, and metering and discharging the disinfected process water out of the environment water body after the disinfected process water reaches the class III water quality standard of surface water.
The effluent quality after advanced treatment can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | Fecal coliform group |
| Concentration (mg/L) | <20 | <1.0 | <1.0 | <0.2 | <1.0X104Per L |
Receiving an environmental water body: the drained water directly enters the environmental water body (surface water environmental quality III water body).
Example 2
The manufacturing industry takes the printing and dyeing industry wastewater as an example.
The water quality of the raw water of the general printing and dyeing industrial wastewater is as follows
| Name of contaminant | COD | NH3-N | TN | TP | SS |
| Concentration (mg/L) | 3500 | 30 | 80 | 6.0 | 300 |
The water quality of the effluent after the treatment of the grating → PH adjustment → adjusting tank → coagulation primary sedimentation → high-efficiency anaerobic reaction → hydrolytic acidification → AO biochemical reaction → secondary sedimentation → coagulation tertiary sedimentation can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | SS |
| Concentration (mg/L) | 150 | 1.0 | 20 | 1.0 | 20 |
And then the mixture is treated and mixed by multi-media filtration → UF → RO "+" Fenton catalytic oxidation → neutralization degassing precipitation → primary denitrification deep bed filtration → secondary denitrification deep bed filtration → aeration biological filtration ", namely, the primary denitrification deep bed filtration is added compared with the deep treatment system of the embodiment 1. The effluent quality can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP |
| Concentration (mg/L) | <20 | <1.0 | <1.0 | <0.2 |
Example 3: taking the comprehensive sewage of an industrial park as an example.
The water quality of the raw water of the general industrial park comprehensive sewage is as follows
| Name of contaminant | COD | NH3-N | TN | TP | SS |
| Concentration (mg/L) | 500 | 50 | 70 | 8.0 | 300 |
Through a grid → a grit chamber → an adjusting tank → a hydrolytic acidification tank → A2The effluent quality after the O biochemical reaction system → secondary sedimentation → coagulation and tertiary sedimentation → filtration can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | SS |
| Concentration (mg/L) | 80 | 1.0 | 20 | 2.0 | 20 |
And then the mixture is treated by multi-media filtration → UF → RO "+" Fenton catalytic oxidation → neutralization degassing precipitation → primary denitrification deep bed filtration → secondary denitrification deep bed filtration → aeration biological filtration, and after the mixture is disinfected, the primary denitrification deep bed filtration is added compared with the deep treatment system of the embodiment 1. The effluent quality can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | Fecal coliform group |
| Concentration (mg/L) | <20 | <1.0 | <1.0 | <0.2 | <1.0X104Per L |
Example 4: take urban domestic sewage as an example.
The water quality of the raw water of the general urban domestic sewage is as follows
| Name of contaminant | COD | NH3-N | TN | TP | SS | Fecal coliform group |
| Concentration (mg/L) | 350 | 40 | 50 | 4.0 | 200 | 1.0X106Per L |
Through the grid → grit chamber → A2The water quality of the effluent after the O biochemical reaction system → the secondary sedimentation → the coagulation and the tertiary sedimentation → the filtration treatment can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | SS | Fecal coliform group |
| Concentration (mg/L) | 50 | 1.0 | 15 | 0.5 | 10 | 1.0X105Per L |
And then the mixture is treated by 'multi-media filtration → UF → RO' + 'Fenton catalytic oxidation → neutralization degassing precipitation → primary denitrification deep bed filtration → secondary denitrification deep bed filtration → aeration biological filtration' and is mixed and disinfected, namely, the primary denitrification deep bed filtration is added compared with the deep treatment system of the embodiment 1. The effluent quality can reach the following table:
| name of contaminant | COD | NH3-N | TN | TP | Fecal coliform group |
| Concentration (mg/L) | <20 | <1.0 | <1.0 | <0.2 | <1.0X104Per L |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an ability reaches advanced treatment system of III types of water standards of surface water, includes middle pond for collect the waste water that does not reach III types of water standards of surface water after materialization processing system and biochemical treatment system handle, its characterized in that: the advanced treatment unit comprises a membrane treatment system and an advanced oxidation treatment system, the membrane treatment system comprises a multi-medium filter, an ultrafiltration system and an RO reverse osmosis system, the advanced oxidation treatment system comprises a Fenton catalytic oxidation system, a neutralization degassing sedimentation tank, a denitrification deep bed filter tank and an aeration biological filter tank, the water outlet pipe of the middle water tank is divided into two branches which are respectively connected with the multi-medium filter and the Fenton catalytic oxidation system, the effluent of the multi-medium filter enters an ultrafiltration system, the effluent of the ultrafiltration system enters an RO reverse osmosis system, the effluent of the Fenton catalytic oxidation system enters a neutralization degassing sedimentation tank, the water outlet of the neutralization degassing sedimentation tank is connected with a denitrification deep bed filter, the water outlet of the denitrification deep bed filter tank is connected with the biological aerated filter tank, and the outlet water of the biological aerated filter tank and the outlet water of the RO reverse osmosis system both enter the mixing tank and are mixed with the concentrated water of the RO reverse osmosis system to return to the biochemical treatment system.
2. The advanced treatment system for achieving the standard of class III water of surface water according to claim 1, wherein: and returning the concentrated water of the RO reverse osmosis system to a comprehensive regulating tank of the biochemical treatment system.
3. The advanced treatment system capable of meeting the standard of class III water of surface water according to claim 1 or 2, characterized in that: and the water in the mixing pool is disinfected by the disinfection treatment unit and then is discharged by the metering discharge channel after reaching the standard.
4. The advanced treatment system for achieving the standard of class III water of surface water according to claim 1, wherein: the RO reverse osmosis treatment system can be two-stage or multi-stage reverse osmosis.
5. An advanced treatment method capable of achieving the III-class water standard of surface water is characterized by comprising the following steps:
1) collecting the wastewater which is treated by the physicochemical treatment system and the biochemical treatment system and does not reach the III-class water standard of the surface water into an intermediate water tank;
2) the water in the middle water tank is divided into two parts which respectively enter a membrane treatment system and an advanced oxidation treatment system of the advanced treatment unit; in the membrane treatment system, firstly, pollutants such as SS and the like are removed through a multi-media filter, then the obtained product enters an ultrafiltration system, the process water meets the water quality requirement of RO reverse osmosis inlet water through ultrafiltration, then the obtained product is pumped into the RO reverse osmosis system, pollutants and salts are intercepted, concentrated water of the RO reverse osmosis system returns to a biochemical treatment system, and fresh water enters a mixing tank; in an advanced oxidation treatment system, firstly, performing Fenton catalytic oxidation on wastewater to remove organic matters difficult to degrade, then performing sludge-water separation in a neutralization degassing precipitation process, oxidizing ferric iron by using a ferrous iron catalyst for Fenton reaction to generate ferric iron, then performing reaction with phosphate in water in the process to precipitate and remove total phosphorus, then adding a denitrification carbon source into a denitrification deep bed filter to remove total nitrogen, finally removing the residual denitrification carbon source through an aeration biological filter, and then, allowing the wastewater to enter a mixing tank to be mixed with fresh water from an RO reverse osmosis system;
2) and discharging the water in the mixing pool after the disinfection treatment.
6. The method of claim 5, wherein the method comprises the steps of: the volume ratio of the wastewater entering the membrane treatment system to the wastewater entering the advanced oxidation treatment system is 50-90%: 50 to 10 percent.
7. The advanced treatment method for achieving the standard of class III water of surface water according to claim 5 or 6, which is characterized in that: the RO membrane treatment system can be formed by connecting two or more stages of membrane processors in series.
8. The method of claim 7, wherein the method comprises the steps of: at least one of the neutralization degassing sedimentation tank, the denitrification deep bed filter tank and the aeration biological filter tank in the advanced oxidation treatment system can be two or more stages.
9. The method of claim 7, wherein the method comprises the steps of: the wastewater passing through the physicochemical treatment system and the biochemical treatment system can reach the integrated wastewater discharge standard or the pollutant discharge standard of urban sewage treatment plants or the industrial discharge standard, but can not meet the III-class water standard of surface water.
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