CN113429018A - Method for reducing concentration of disinfection by-product in drinking water treatment process - Google Patents
Method for reducing concentration of disinfection by-product in drinking water treatment process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 58
- 230000008569 process Effects 0.000 title claims abstract description 42
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- 235000020188 drinking water Nutrition 0.000 title claims abstract description 31
- 239000003651 drinking water Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 128
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
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- 238000001914 filtration Methods 0.000 claims abstract description 15
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- 238000005345 coagulation Methods 0.000 claims description 16
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- 238000011001 backwashing Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 description 6
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- 150000001875 compounds Chemical class 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- HJKYXKSLRZKNSI-UHFFFAOYSA-I pentapotassium;hydrogen sulfate;oxido sulfate;sulfuric acid Chemical compound [K+].[K+].[K+].[K+].[K+].OS([O-])(=O)=O.[O-]S([O-])(=O)=O.OS(=O)(=O)O[O-].OS(=O)(=O)O[O-] HJKYXKSLRZKNSI-UHFFFAOYSA-I 0.000 description 5
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- -1 DBCM Chemical compound 0.000 description 1
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a method for reducing the concentration of disinfection by-products in the drinking water treatment process, which adds an advanced treatment process of 'ozone and carbon sand filter' on the basis of the conventional treatment process (coagulation-precipitation-filtration), effectively reduces the concentration of the disinfection by-products in the discharged water, and simultaneously reduces CODMnAnd the like. The process of the invention improves the disinfection effect and reduces the concentration of disinfection by-products.
Description
Technical Field
The invention relates to the field of drinking water treatment processes, in particular to a method for reducing the concentration of disinfection byproducts in a drinking water treatment process.
Background
The disinfection is an important step in the treatment process of the drinking water, and can effectively remove pathogenic microorganisms in the water body and the generated water-mediated diseases. But also brings new problems: some disinfection by-products (DBPs) having carcinogenic or side effects are thus produced. At present, most of domestic water treatment plants adopt chlorine disinfection as a main disinfection mode. The disinfection by-products [1] produced by chlorine disinfection mainly include Trihalomethanes (THMs), Haloaldehydes (HAs), haloacetic acids (HAAs), Haloacetonitrile (HANs), and the like.
THMs are the most studied and most frequently detected disinfection by-products in recent years. Which is the sum of four disinfection byproducts, Trichloromethane (TCM), chlorodibromomethane (DBCM), Bromodichloromethane (BDCM) and Tribromomethane (TBM). Research shows that THMs can inhibit the central nervous system of human body, affect the functions of liver and kidney, and are carcinogenic and teratogenic substances (Ref. Xiaozhu, Chuwenhai. Global drinking water standard control index comparison and enlightenment [ J/OL ] environmental science research: 1-13.). At present, the limit values of TCM, DBCM, BDCM and TBM are respectively 0.06mg/L, 0.1mg/L and 0.1mg/L which are regulated in the sanitary Standard for Drinking Water (GB 5749-2006) in China, and the sum of the ratio of the actually measured concentration of the four compounds to the respective limit value is not more than 1. Chloral (CH) is the highest level of a disinfection by-product among the halogenated aldehydes. At present, the CH limit value is regulated to be 0.01mg/L in the sanitary Standard for Drinking Water (GB 5749-2006) in China.
The world health organization proposed that in order to reduce the concentration of DBPs, the following measures may be taken [ ref. homogine, chu wenghai, xubin ] talk of control strategies for novel disinfection by-products in drinking water from the generation mechanism [ J ] water supply and drainage, 2017,53(02):1-5 ]: (1) changing the conditions of the disinfection treatment process, such as the adding amount, the adding time and the like; (2) selecting other disinfectants; (3) removing the by-products before supplying water; (4) non-chemical disinfection means such as ozone, ultraviolet advanced oxidation are used.
CN106630321A patent discloses a treatment process of disinfection by-products of drinking water, which comprises pumping water into a water plant, coagulating, precipitating, filtering, sterilizing with ultraviolet rays, feeding into a clean water tank, adding chlorine dioxide and chloramine, adding polyferric sulfate for disinfection, feeding into a blow-off tank for aeration blow-off, filtering with activated carbon, and feeding into a tap water pipeline with high pressure by a water pump. The process can treat organic matters in water before chlorination and disinfection, remove precursor substances of disinfection byproducts, control the generation of the chlorination byproducts, and clean the disinfection byproducts in water again after chlorination and disinfection, thereby effectively reducing the amount of DBPs.
CN108217826A chinese patent discloses a disinfection method and a disinfection system for drinking water, belonging to the technical field of water disinfection. The drinking water disinfection method comprises the following steps: pretreating untreated raw water; pre-treated water is added at 10-80mJ/cm2Performing disinfection treatment under the ultraviolet dose; and (3) carrying out disinfection treatment on the water flow by potassium monopersulfate powder, wherein the addition amount of the potassium monopersulfate powder is not less than 1mg/L, the retention time of water in the disinfection unit is not less than 30min, and the balance of the potassium monopersulfate powder in the water entering the water pipe network is not less than 0.04 mg/L. The drinking water is disinfected by ultraviolet combined with the potassium monopersulfate powder, the method disinfects and disinfects the water by ultraviolet, the continuous disinfection capability of a pipe network is maintained by the potassium monopersulfate powder, the possibility of bacteria regeneration is reduced, and the biological safety of the discharged water is ensured.
At present, in the prior art, domestic drinking water is disinfected and byproducts generated by disinfection are also treated by some technologies, but the most common water treatment process in China is a conventional treatment process (coagulation-precipitation-filtration-disinfection) and has a limited effect of removing the disinfection byproducts.
Accordingly, there is a need to provide a process that effectively reduces the amount of disinfection byproducts.
Disclosure of Invention
The invention aims to provide a subsequent advanced treatment process for treating water by using ozone-biological activated carbon, which has a remarkable effect on removing organic pollutants such as disinfection byproducts and the like.
Specifically, the invention provides a method for reducing the concentration of disinfection byproducts in the drinking water treatment process, which adds an advanced treatment process of 'ozone and carbon sand filter' on the basis of the conventional treatment process (coagulation-precipitation-filtration), effectively reduces the concentration of the disinfection byproducts in the discharged water, and simultaneously reduces CODMnAnd the like.
More specifically, a method for reducing the concentration of disinfection byproducts in a drinking water treatment process, comprising the steps of:
1) coagulation: the raw water is pressurized by a water pump, enters a coagulation chamber, is added with a medicament, is stirred and uniformly mixed with water to form flocculent precipitate, and is stopped stirring;
2) and (3) precipitation: enabling the water subjected to coagulation treatment in the step (1) to flow into a sedimentation tank through a pipeline, wherein the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 3-10mm/s, flocculating constituents are further precipitated in the rising process, and the water flows into a filtering tank through an outlet of the sedimentation tank;
3) and (3) filtering: water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank;
4) ozone treatment, namely, disinfecting filtered water in an ozone tank, starting an ozone generator, and adding ozone with the concentration of 1.0-1.8 mg/L; the contact time of ozone aeration is 10-30 min;
5) and (3) carbon sand filter treatment, wherein water fully contacted with ozone enters the carbon sand filter, and the filling filter material arrangement comprises the following steps:
the thickness of the gravel layer is 7-13cm with the particle size of 4-8mm, the thickness of the gravel layer is 3-7cm with the particle size of 2-4mm, and the total thickness of the gravel layer is 10-20 cm;
a sand layer which is composed of fine sand with the grain diameter of 0.20-0.30mm and has the thickness of 20-40 cm;
the activated carbon layer consists of activated carbon particles with the particle size of 0.7-1.0mm, and the thickness is 120-150 cm;
controlling the filtration rate of water to be 7-15 m/h; a backwashing period: 1-3 times per week; in the back washing program, air scrubbing is carried out for 40-60m/h, and after 2min, water washing is carried out for 20-30m/h independently, and the time is controlled for 10-15 min.
In some embodiments, the pharmaceutical agent of step (1) is a PAC solution.
In some embodiments, the ozone aeration of step (4) forms bubbles in the water having a diameter of 10 to 50 μm.
In some embodiments, the outlet of the ozone-aerated conduit of step (4) is equipped with a nozzle with adjustable size.
In some embodiments, the step (4) nozzle has a size of 1-10 μm.
In some embodiments, the stirring time of step (1) is 10-40 min.
In some embodiments, the angle of the pipe at the angle ramp in step (2) is 45 °.
Advantageous effects
Compared with the prior art, the invention has the following technical effects:
the removal rate of chloral from the effluent of the carbon sand filter tank reaches over 90 percent and the removal rate of trihalomethane reaches over 70 percent in the water after the treatment process. After being treated by the ozone and carbon sand filter tank, the concentration of chloral and chloroform which are disinfection byproducts in water can be effectively reduced. Meanwhile, the diameter of the bubbles is controlled during ozone aeration, so that the retention time (effective contact time with water) of ozone in water is longer, ozone in aqueous solution is prevented from being diffused out on the surface of water due to factors such as illumination and the like, the effects of disinfection and reduction of the content of byproducts are improved, and the ozone content is saved.
Drawings
FIG. 1 is a process flow diagram of a method for reducing the concentration of disinfection byproducts in a drinking water treatment process according to the present application.
Detailed Description
The present invention is described in more detail below to facilitate an understanding of the present invention.
Those skilled in the art will recognize that: the chemical reactions described herein may be used to suitably prepare a number of other compounds of the invention, and other methods for preparing the compounds of the invention are considered to be within the scope of the invention. For example, the synthesis of those non-exemplified compounds according to the present invention can be successfully accomplished by those skilled in the art by modification, such as appropriate protection of interfering groups, by the use of other known reagents in addition to those described herein, or by some routine modification of reaction conditions. In addition, the reactions disclosed herein or known reaction conditions are also recognized as being applicable to the preparation of other compounds of the present invention.
FIG. 1 is a process flow diagram of a method for reducing the concentration of disinfection byproducts in a drinking water treatment process according to the present application.
As shown in figure 1, the raw water passes through a folded plate flocculation tank, a horizontal flow sedimentation tank and a V-shaped filter tank, and then passes through an ozone aeration treatment and a carbon sand filter tank to complete the drinking water treatment process.
Example 1:
pressurizing raw water by a water pump, feeding the raw water into a coagulation chamber, adding a medicament, stirring for 16min, uniformly mixing the raw water with water to form flocculent precipitate, and stopping stirring;
the water after coagulation treatment flows into a sedimentation tank through a pipeline, the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 5mm/s, the flocculating constituent is further precipitated in the rising process, and the water flows to a filter tank through an outlet of the sedimentation tank;
water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank and enter an ozone tank;
turning on an ozone generator, setting the adding concentration to be 1.5mg/L, setting the diameter of bubbles formed in water to be 10-50 μm, and setting the ozone aeration contact time to be 15 min;
entering a carbon sand filter tank, and filling filter material parameters as follows: comprises a bearing layer (the diameter of gravel is 4-8mm, the thickness is 10cm, the diameter is 2-4mm, 5 cm); (ii) a Sand layer (particle size 0.28 mm): 25 cm; activated carbon (particle size 0.8 mm): 150 cm; filtering speed: 12 m/h; a backwashing period: 1 time/week; the backwashing program is used for air scrubbing for 40m/h, and after 2min, the water is separately washed for 20m/h and 10 min;
completing the treatment project of the drinking water.
Example 2:
pressurizing raw water by a water pump, feeding the raw water into a coagulation chamber, adding a medicament, stirring for 10min, uniformly mixing the raw water with water to form flocculent precipitate, and stopping stirring;
the water after coagulation treatment flows into a sedimentation tank through a pipeline, the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 3mm/s, the flocculating constituent is further precipitated in the rising process, and the water flows to a filter tank through an outlet of the sedimentation tank;
water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank and enter an ozone tank;
turning on an ozone generator, setting the adding concentration to be 1.2mg/L, setting the diameter of bubbles formed in water to be 10-50 μm, and setting the ozone aeration contact time to be 10 min;
entering a carbon sand filter tank, and filling filter material parameters as follows: comprises a bearing layer (the diameter of gravel is 4-8mm, the thickness is 10cm, the diameter is 2-4mm, 5 cm); (ii) a Sand layer (particle size 0.28 mm): 30 cm; activated carbon (particle size 0.7 mm): 140 cm; filtering speed: 10 m/h; a backwashing period: 1 time/week; the backwashing program is used for air scrubbing for 40m/h, and after 2min, the water is separately washed for 25m/h and 10 min;
completing the treatment project of the drinking water.
Example 3:
pressurizing raw water by a water pump, feeding the raw water into a coagulation chamber, adding a medicament, stirring for 15min, uniformly mixing the raw water with water to form flocculent precipitate, and stopping stirring;
the water after coagulation treatment flows into a sedimentation tank through a pipeline, the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 10mm/s, the flocculating constituent is further precipitated in the rising process, and the water flows to a filter tank through an outlet of the sedimentation tank;
water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank and enter an ozone tank;
turning on an ozone generator, setting the adding concentration to be 1.2mg/L, setting the diameter of bubbles formed in water to be 10-50 μm, and setting the ozone aeration contact time to be 10 min;
entering a carbon sand filter tank, and filling filter material parameters as follows: comprises a bearing layer (the diameter of gravel is 4-8mm, the thickness is 10cm, the diameter is 2-4mm, 5 cm); sand layer (particle size 0.30 mm): 40 cm; activated carbon (particle size 0.9 mm): 150 cm; filtering speed: 15 m/h; a backwashing period: 12 times per week; the backwashing program is used for air scrubbing for 50m/h, and after 2min, the water scrubbing is carried out for 25m/h and 15 min;
completing the treatment project of the drinking water.
Example 4:
pressurizing raw water by a water pump, feeding the raw water into a coagulation chamber, adding a medicament, stirring for 19min, uniformly mixing the raw water with water to form flocculent precipitate, and stopping stirring;
the water after coagulation treatment flows into a sedimentation tank through a pipeline, the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 7mm/s, the flocculating constituent is further precipitated in the rising process, and the water flows to a filter tank through an outlet of the sedimentation tank;
water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank and enter an ozone tank;
turning on an ozone generator, setting the adding concentration to be 1.5mg/L, setting the diameter of bubbles formed in water to be 10-50 μm, and setting the ozone aeration contact time to be 15 min;
entering a carbon sand filter tank, and filling filter material parameters as follows: comprises a bearing layer (the diameter of gravel is 4-8mm, the thickness is 8 cm/diameter is 2-4mm, the thickness is 8 cm); sand layer (particle size 0.30 mm): 35 cm; activated carbon (particle size 0.9 mm): 140 cm; filtering speed: 12 m/h; a backwashing period: 1 time/week; the backwashing program is used for air scrubbing for 40m/h, and after 2min, the water is separately washed for 25m/h and 10 min;
completing the treatment project of the drinking water.
Comparative example 1
Pressurizing raw water by a water pump, feeding the raw water into a coagulation chamber, adding a medicament, stirring for 15min, uniformly mixing the raw water with water to form flocculent precipitate, and stopping stirring;
the water after coagulation treatment flows into a sedimentation tank through a pipeline, the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 10mm/s, the flocculating constituent is further precipitated in the rising process, and the water flows to a filter tank through an outlet of the sedimentation tank;
water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank;
and completing the treatment project of the drinking water after multi-layer filtration.
Determination of the content of disinfection by-products
The water inlet of the carbon sand filter, the water outlet of the carbon sand filter and the water outlet of the conventional water treatment process in the embodiment of the application are respectively subjected to detection of disinfection byproducts (CH and THMs).
The results are as follows:
bubble diameter distribution for ozone aeration
The effect of the diameter of the bubbles in the water on the ozone concentration and thus on the ozone disinfection was tested.
With reference to example 1, the other conditions were unchanged. Only the diameter parameters formed in the process of the ozone aeration sterilization step were changed.
Comparative example 2
Example 1 other conditions were unchanged except for the following steps:
turning on an ozone generator, setting the adding concentration to be 1.5mg/L, setting the diameter of bubbles formed in water to be 1-9 μm, and setting the ozone aeration contact time to be 15 min;
the water treatment is completed.
Comparative example 3
Example 1 other conditions were unchanged except for the following steps:
turning on an ozone generator, setting the adding concentration to be 1.5mg/L, setting the diameter of bubbles formed in water to be 51-80 μm, and setting the ozone aeration contact time to be 15 min;
the water treatment is completed.
The ozone concentration in the water after the ozone aeration time of example 1 and comparative examples 2 to 3 was again measured. The results are as follows.
The invention controls the diameter of the bubbles when the ozone is aerated, so that the retention time (effective contact time with water) of the ozone in the water is longer, and the ozone in the water solution is prevented from being diffused out on the surface of the water due to factors such as illumination and the like, thereby improving the effects of disinfection and reducing the content of byproducts, ensuring the effective disinfection concentration of the ozone and saving the content of the ozone.
The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.
Claims (7)
1. A method for reducing the concentration of disinfection byproducts in a drinking water treatment process, comprising the steps of:
1) coagulation: the raw water is pressurized by a water pump, enters a coagulation chamber, is added with a medicament, is stirred and uniformly mixed with water to form flocculent precipitate, and is stopped stirring;
2) and (3) precipitation: enabling the water subjected to coagulation treatment in the step (1) to flow into a sedimentation tank through a pipeline, wherein the sedimentation tank is provided with a pipeline with an inclined angle, the water enters the pipeline from the lower part of the sedimentation tank, the flow rate is 3-10mm/s, flocculating constituents are further precipitated in the rising process, and the water flows into a filtering tank through an outlet of the sedimentation tank;
3) and (3) filtering: water enters the V-shaped filter tank, is filtered by a filter material layer and then enters a pipeline through a water collecting tank to flow out of the V-shaped filter tank;
4) ozone treatment, namely, disinfecting filtered water in an ozone tank, starting an ozone generator, and adding ozone with the concentration of 1.0-1.8 mg/L; the contact time of ozone aeration is 10-30 min;
5) and (3) carbon sand filter treatment, wherein water fully contacted with ozone enters the carbon sand filter, and the filling of filter materials comprises the following steps:
the thickness of the gravel layer is 7-13cm with the particle size of 4-8mm, the thickness of the gravel layer is 3-7cm with the particle size of 2-4mm, and the total thickness of the gravel layer is 10-20 cm;
a sand layer which is composed of fine sand with the grain diameter of 0.20-0.30mm and has the thickness of 20-40 cm;
the activated carbon layer consists of activated carbon particles with the particle size of 0.7-1.0mm, and the thickness is 120-150 cm;
controlling the filtration rate of water to be 7-15 m/h; a backwashing period: 1-3 times per week; in the back washing program, air scrubbing is carried out for 40-60m/h, and after 2min, water washing is carried out for 20-30m/h independently, and the time is controlled for 10-15 min.
2. A method for reducing the concentration of disinfection byproducts in a drinking water treatment process as claimed in claim 1, wherein said agent of step (1) is a PAC solution.
3. The method for reducing concentration of disinfection by-products in drinking water treatment process as claimed in claim 1, wherein said ozone aeration of step (4) forms bubbles with diameter of 10-50 μm in water.
4. A method for reducing the concentration of disinfection byproducts in a drinking water treatment process as claimed in claim 1, wherein said ozone-aerated conduit outlet of step (4) is equipped with a nozzle with adjustable size.
5. The method for reducing concentration of disinfection byproducts in drinking water treatment process according to claim 1, wherein the size of the step (4) nozzle is 1-10 μm.
6. The method for reducing the concentration of disinfection byproducts in drinking water treatment process according to claim 1, wherein the stirring time of step (1) is 10-40 min.
7. A method for reducing the concentration of disinfection byproducts in a drinking water treatment process as set forth in claim 1, wherein the angle of the angled pipe in step (2) is 45 °.
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