CN111533316A - Method for effectively controlling ozone oxidation by-products and pollutants in water treatment process - Google Patents

Method for effectively controlling ozone oxidation by-products and pollutants in water treatment process Download PDF

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CN111533316A
CN111533316A CN202010402939.6A CN202010402939A CN111533316A CN 111533316 A CN111533316 A CN 111533316A CN 202010402939 A CN202010402939 A CN 202010402939A CN 111533316 A CN111533316 A CN 111533316A
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ozone
water
filtration
filter
pollutants
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李贤舟
柯琦
张孝洪
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Zhoushan Water Supply Co ltd
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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
    • C02F1/52—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
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • 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
    • 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
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • 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

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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention relates to the technical field of water treatment, in particular to a method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process. According to the method, the pre-oxidant potassium permanganate/sodium bisulfite is added before the ozone reaction for pre-oxidation treatment, so that the atrazine ATR can be effectively removed, the generation of bromate and chloral can be effectively inhibited, the removal of organic matters is ensured while the byproducts are controlled, and the method is an effective method for controlling pollutants and ozone oxidation byproducts; the method adopted by the invention has the advantages of low cost, easy realization, convenient management and control, higher operability and wide application range.

Description

Method for effectively controlling ozone oxidation by-products and pollutants in water treatment process
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process.
Background
In recent years, the water pollution is serious, and the process combining ozone and activated carbon has excellent performances in the aspects of treating organic pollutants, controlling odor substances and the like, and is more and more widely applied. However, a series of byproducts are generated in the ozone oxidation process. Bromate, which is carcinogenic, is generally produced in the presence of bromide ions, and the U.S. environmental protection agency sets a limit of 10 μ g/L in drinking water. Meanwhile, ozone can increase the content of aldehyde ketone substances in water, and the aldehyde ketone substances are important precursors of Chloral (CH), so that the generation of Chloral (CH) can be increased in the subsequent disinfection link. The World Health Organization (WHO) has specified a limit of 10 μ g/L due to the potential harm of Chloral (CH) to the human body. Atrazine (ATR), also known as atrazine, is an artificially synthesized chemical herbicide, and due to the interference characteristic of the atrazine to endocrine, the long-term action of low dose can threaten the health of the immune system and nervous system of a human body, so the limit value of atrazine of 0.002 mu g/L is specified in the sanitary standard GB 5749 and 2006 of domestic drinking water of China.
Common ozone oxidation byproduct control techniques include hydrogen peroxide pre-oxidation, ammonia addition, pH adjustment, and the like. The control methods have some disadvantages, the ozone decomposition is accelerated by hydrogen peroxide pre-oxidation to influence the control effect of the ozone on pollutants, a nitrogen source is introduced by adding ammonia, a high-toxicity nitrogen-containing byproduct is generated in a subsequent disinfection link, and the pH adjustment cost is high under the condition of high alkalinity. Studies have shown that pre-oxidation by potassium Permanganate (PM) can control bromate formation, but potassium permanganate has a low reaction rate with many pollutants and poor activity, and therefore, it is necessary to develop a method for effectively controlling pollutants and ozone oxidation byproducts in water treatment processes.
Disclosure of Invention
The invention provides a method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process.
A method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process comprises the step of carrying out preoxidation treatment by using a preoxidant before ozone oxidation, wherein the preoxidant is a mixture of potassium permanganate and sodium bisulfite, and the treatment time of the preoxidant is 20 min.
Preferably, the volume ratio of the addition amount of the pre-oxidant to the stock solution is 1mg/L-5mg/L of potassium permanganate; sodium bisulfite 1mg/L-5 mg/L.
Preferably, the volume ratio of the addition amount of the pre-oxidant to the stock solution is 1mg/L-2mg/L of potassium permanganate; sodium bisulfite 5 mg/L;
preferably, the method for effectively controlling the ozone oxidation byproducts and pollutants in the water treatment process further comprises an ozone oxidation step.
Further preferably, the ozone concentration of the water body in the ozone oxidation step is 1-5mg/L, and the ozone concentration is 3 mg/L.
Preferably, the method for effectively controlling ozone oxidation byproducts and pollutants in the water treatment process further comprises the following steps: coagulating sedimentation, primary filtration, ozone-activated carbon advanced treatment and secondary filtration.
Further preferably, the flocculating agent used in the coagulating sedimentation step is polyaluminium chloride.
Preferably, the primary filtration can be membrane filtration or pre-sand filter filtration.
Preferably, the concentration of ozone water in the ozone-activated carbon advanced treatment is 0.05-0.20 mug/L.
Preferably, the secondary filtration can be membrane filtration or a post-sand filter.
According to the method, the pre-oxidant potassium permanganate/sodium bisulfite is added before the ozone reaction for pre-oxidation treatment, so that Atrazine (ATR) can be effectively removed, the generation of bromate and chloral can be effectively inhibited, the removal of organic matters is ensured while byproducts are controlled, and the method is an effective method for controlling pollutants and ozone oxidation byproducts; the method adopted by the invention has the advantages of low cost, easy realization, convenient management and control, higher operability and wide application range.
Detailed Description
The principles and advantages of the present invention are explained and illustrated below by specific embodiments in order to provide a better understanding of the present invention to those skilled in the art. The following description is exemplary in nature and is not intended to limit the scope of the disclosure.
Unless explicitly stated, the reagents and instrumentation used in the examples below are conventional and available from commercial sources; the methods used in the following examples are conventional methods, and those skilled in the art can unambiguously repeat the experiments and obtain corresponding results based on the description thereof.
Determination of bromate: sampling and measuring after ozone oxidation, and measuring Br by ion chromatograph (ICS-1100 type) of Saka-And BrO3 -Ions ofThe chromatographic conditions were as follows: leacheate: 9.2mmol L-1The flow rate of the eluent is 0.3mL/min, the inhibition mode is an electrical inhibition ASRS-Ultra (2min) type anion inhibitor, the column temperature is 35 ℃, the detector is a conductivity detector, the detector temperature is 35 ℃, the chromatographic column is an IonPAC AG9HC anion protection column (50mm × 2mm), an IonPAC AS9HC anion separation column (250mm × 2mm), and the sample injection amount is 100 mu L. Br-And BrO3 -The detection limits are respectively 5 mu g L-1And 2. mu.gL-1。
Raw water: coming to an inlet water sampling port of a city-adjacent water plant;
the water quality index of raw water is as follows: DOC concentration is 2.24-3.58 mg/L, UV254 concentration is 0.031-0.045 cm-1The SUVA concentration is 1.09-2.01 L.mg-1·m-1The concentration of bromide ion is 63-150 μ g/L, the concentration of atrazine is 0.8-3.6 μ g/L, and the pH value is 7.4-7.8.
Ozone is calibrated by an iodometry method: the disinfectant index GB/T5750.11-2006 of the Standard test method for Drinking Water, PM is calibrated by a spectrophotometry under 525 nm;
measurement of ATR: the Japanese Shimadzu high performance liquid chromatograph (LC-20AD type) was used. The measurement conditions were as follows: c18 column (46mm × 15cm, particle size 5um) is adopted; liquid carrying: 5+1 of methanol + water; flow rate: 0.9 mL/min; column temperature: 25.5 ℃; wavelength: 220 nm.
Chloral (CH) is measured by a disinfection by-product GB/T5750.10-2006 method of 'Standard test method for Drinking Water'.
Example 1:
1) taking 8L of raw water sample, filtering with a filter membrane, wherein the aperture of the filter membrane is 0.45 μm, dividing into 8 equal parts (respectively named A, B, C, D, E, F, G, H), and adding atrazine as a pollutant into the samples respectively to ensure that the weight-volume ratio (unit) of Atrazine (ATR) to raw water is 150.0 μ g/L;
2) the 8 samples (A, B, C, D, E, F, G, H) obtained in step 1) were subjected to the following treatments: sample a: adding 1mg/L potassium permanganate and 5mg/L sodium bisulfite into the sample A in the step 1), and adjusting the pH value to 7 by using NaOH solution or HCl solution; stirring by a rotor, and pre-oxidizing for 20 min; sample B: adding 2mg/L potassium permanganate and 5mg/L sodium bisulfite into the sample B in the step 1), and adjusting the pH value to 7 by using NaOH solution or HCl solution; stirring by a rotor, and pre-oxidizing for 20 min;
sample C: the sample C in the step 1) is not subjected to pre-oxidation treatment;
sample D: adding 5mg/L sodium bisulfite into the sample D in the step 1) for pretreatment, and adjusting the pH to 7 by using NaOH solution or HCl solution; stirring by a rotor, and pre-oxidizing for 20 min;
sample E: adding 0.5mg/L potassium permanganate into the sample E in the step 1) for pretreatment, and adjusting the pH value to 7 by using a NaOH solution or an HCl solution; stirring with rotor, and pre-oxidizing for 20min
Sample F: adding 1mg/L potassium permanganate into the sample E in the step 1) for pretreatment, and adjusting the pH value to 7 by using a NaOH solution or an HCl solution; stirring with rotor, and pre-oxidizing for 20min
Sample G: adding 2mg/L potassium permanganate into the sample E in the step 1) for pretreatment, and adjusting the pH value to 7 by using a NaOH solution or an HCl solution; stirring by a rotor, and pre-oxidizing for 20 min;
sample H: adding 0.5mg/L potassium permanganate and 5mg/L sodium bisulfite into the sample F in the step 1), and adjusting the pH value to 7 by using NaOH solution or HCl solution; stirring by a rotor, and pre-oxidizing for 20 min;
3) respectively carrying out ozone reaction on the samples A, B, C, D, E, F, G and H treated in the step 2), wherein the concentration of ozone is 3mg/L, stirring by using a rotor, and the contact time of ozone is 30 min.
4) Adding sodium hypochlorite with different concentrations into the samples A, B, C, D, E, F, G and H treated in the step 2), wherein the amount of the added sodium hypochlorite is 0.8mg/L +/-0.5 mg/L of residual chlorine after 24 hours of reaction, adding ascorbic acid to quench the residual chlorine after 24 hours of reaction, and respectively detecting the content of bromate, the content of chloral and the content of atrazine, wherein the results are shown in Table 1.
TABLE 1
Figure BDA0002490195040000041
From the above results it can be seen that: the pretreatment of 2mg/L potassium permanganate and 5mg/L sodium bisulfite reduces the removal rate of ATR, while the pretreatment of 1mg/L potassium permanganate and 5mg/L sodium bisulfite enhances the removal of ATR, and the control of bromate and chloral by the two methods is superior to that of other groups. The pre-oxidation of 1mg/L potassium permanganate increases the generation amount of bromate and CH, and the bromate and chloral have overproof risks. Under the dosage of 1mg/L potassium permanganate and 5mg/L sodium bisulfite, the potassium permanganate/sodium bisulfite can control the potential generated by bromate and CH while ensuring the effective removal of ATR, and is a method for effectively controlling the ozone oxidation by-products.
Example 2
1) Pre-oxidizing with a pre-oxidizing agent: the amount of water entering the factory is 3000t/h, the adding amount of potassium permanganate is 1mg/L, the adding amount of sodium bisulfite is 5mg/L, and the pre-oxidation treatment time is 20 min; obtaining a water sample after pre-oxidation treatment;
2) ozone pretreatment: adding ozone into the water sample subjected to the pre-oxidation treatment in the step 1), controlling the concentration of the ozone to be 3mg/L, and allowing the ozone to contact for 3min to obtain a water sample subjected to ozone pretreatment;
3) coagulating sedimentation: adding 25mg/L polyaluminium chloride into the water sample pretreated by the ozone in the step 2);
4) a front sand filter: a single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm. The design scale of the front sand filter is 8 ten thousand meters3And d, backwashing the filter material in the V-shaped filter tank by using air water for filtering the uniform-particle filter material. The filtration speed is 8m/h, the forced filtration speed is 9.6m/h, and the total filtration area is 438.36m2. The filter is divided into 6 grids which are arranged in double rows, and the single-grid filter area is 73.06m2。
5) Ozone-activated carbon treatment: the concentration of ozone water in the ozone-active carbon advanced treatment is 0.1 mu g/L, and the active carbon filter tank is 8 ten thousand meters3The design of the/d scale is that the area of a 4-grid filter chamber and a single-grid filter chamber is 73.06m2The filter material of the activated carbon filter adopts granular activated carbon, the thickness of the filter material is 1.9m, the granularity of 8 × 30 (equivalent to 2.38 × 0.6.6 mm), and the bulk density is 8.38 mm, × mm0.35～0.55g/cm2The non-uniformity coefficient k80 is 1.9 to 2.0.
6) Filtering by a post sand filter: the design scale of the post-sand filter is 12 ten thousand meters3And d, filtering the material by adopting a uniform-particle filtering material air-water backflushing V-shaped filtering pool. The filtration rate is 9m/h, the forced filtration rate is 10.27m/h, and the total filtration area is 583.33m2. The filter is divided into 8 grids which are arranged in double rows, and the single-grid filter area is 73.06m2. A single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm.
7) After the filtration step of the post-sand filter, sodium hypochlorite is added to control the residual chlorine of the factory water to be 0.8mg/L +/-0.5 mg/L.
Obtaining a water sample before leaving a factory, and determining that the bromate content is less than or equal to 2.0 mu g/L, the chloral content is less than or equal to 1 mu g/L and the atrazine content is less than or equal to 0.5 mu g/L.
Example 3
1) Pre-oxidizing with a pre-oxidizing agent: the amount of water entering the factory is 3000t/h, the adding amount of potassium permanganate is 2mg/L, the adding amount of sodium bisulfite is 5mg/L, and the pre-oxidation treatment time is 20 min; obtaining a water sample after pre-oxidation treatment;
2) ozone pretreatment: adding ozone into the water sample subjected to the pre-oxidation treatment in the step 1), controlling the concentration of the ozone to be 3mg/L, and allowing the ozone to contact for 3min to obtain a water sample subjected to ozone pretreatment;
3) coagulating sedimentation: adding 24mg/L polyaluminium chloride into the water sample pretreated by the ozone in the step 2);
4) a front sand filter: a single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm. The design scale of the front sand filter is 8 ten thousand meters3And d, backwashing the filter material in the V-shaped filter tank by using air water for filtering the uniform-particle filter material. The filtration speed is 8m/h, the forced filtration speed is 9.6m/h, and the total filtration area is 438.36m2. The filter is divided into 6 grids which are arranged in double rows, and the single-grid filter area is 73.06m2。
5) Ozone-activated carbon treatment: the concentration of ozone water in the ozone-active carbon advanced treatment is 0.1 mu g/L, and the active carbon filter tank is 8 ten thousand meters3The design of the/d scale is that the area of a 4-grid filter chamber and a single-grid filter chamber is 73.06m2The filter material of the activated carbon filter adopts granular activated carbon, the thickness of the filter material is 1.9m, the granularity of 8 × 30 (equivalent to 2.38 × 0.6.6 mm) is adopted, the stacking density is 0.35-0.55 g/cm2The non-uniformity coefficient k80 is 1.9 to 2.0.
6) Filtering by a post sand filter: the design scale of the post-sand filter is 12 ten thousand meters3And d, filtering the material by adopting a uniform-particle filtering material air-water backflushing V-shaped filtering pool. The filtration rate is 9m/h, the forced filtration rate is 10.27m/h, and the total filtration area is 583.33m2. The filter is divided into 8 grids which are arranged in double rows, and the single-grid filter area is 73.06m2. A single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm.
7) After the filtration step of the post-sand filter, sodium hypochlorite is added to control the residual chlorine of the factory water to be 0.8mg/L +/-0.5 mg/L.
Obtaining a water sample before leaving a factory, and determining that the bromate content is less than or equal to 2.0 mu g/L, the chloral content is less than or equal to 1 mu g/L and the atrazine content is less than or equal to 0.5 mu g/L.
Comparative example 1
1) Pre-oxidizing with a pre-oxidizing agent: the amount of water entering the factory is 3000t/h, the adding amount of sodium bisulfite is 5mg/L, and the pre-oxidation treatment time is 20 min; obtaining a water sample after pre-oxidation treatment;
2) ozone pretreatment: adding ozone into the water sample subjected to the pre-oxidation treatment in the step 1), controlling the concentration of the ozone to be 3mg/L, and allowing the ozone to contact for 3min to obtain a water sample subjected to ozone pretreatment;
3) coagulating sedimentation: adding 30mg/L polyaluminium chloride into the water sample pretreated by the ozone in the step 2);
4) a front sand filter: the single-layer quartz sand filter material has the particle size d10 of 0.9mm, the non-uniformity coefficient k80 of 1.4 and the thickness of 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm. The design scale of the front sand filter is 8 ten thousand meters3And d, backwashing the filter material in the V-shaped filter tank by using air water for filtering the uniform-particle filter material. The filtration speed is 8m/h, the forced filtration speed is 9.6m/h, and the total filtration surfaceProduct of 438.36m2. The filter is divided into 6 grids which are arranged in double rows, and the single-grid filter area is 73.06m2。
5) Ozone-activated carbon treatment: the concentration of ozone water in the ozone-active carbon advanced treatment is 0.1 mu g/L, and the active carbon filter tank is 8 ten thousand meters3The design of the/d scale is that the area of a 4-grid filter chamber and a single-grid filter chamber is 73.06m2The filter material of the activated carbon filter adopts granular activated carbon, the thickness of the filter material is 1.9m, the granularity of 8 × 30 (equivalent to 2.38 × 0.6.6 mm) is adopted, the stacking density is 0.35-0.55 g/cm2The non-uniformity coefficient k80 is 1.9 to 2.0.
6) Filtering by a post sand filter: the design scale of the post-sand filter is 12 ten thousand meters3And d, filtering the material by adopting a uniform-particle filtering material air-water backflushing V-shaped filtering pool. The filtration rate is 9m/h, the forced filtration rate is 10.27m/h, and the total filtration area is 583.33m2. The filter is divided into 8 grids which are arranged in double rows, and the single-grid filter area is 73.06m2. A single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm.
7) After the filtration step of the post-sand filter, sodium hypochlorite is added to control the residual chlorine of the factory water to be 0.8mg/L +/-0.5 mg/L.
Obtaining a water sample before leaving a factory, and determining that the bromate content is 9.7 mu g/L, the chloral content is 5.6 mu g/L and the atrazine content is less than or equal to 0.5 mu g/L.
Comparative example 2
1) Pre-oxidizing with a pre-oxidizing agent: the amount of water entering the factory is 3000t/h, the adding amount of potassium permanganate is 1mg/L, and the pre-oxidation treatment time is 20 min; obtaining a water sample after pre-oxidation treatment;
2) ozone pretreatment: adding ozone into the water sample subjected to the pre-oxidation treatment in the step 1), controlling the concentration of the ozone to be 3mg/L, and allowing the ozone to contact for 3min to obtain a water sample subjected to ozone pretreatment;
3) coagulating sedimentation: adding 30mg/L polyaluminium chloride into the water sample pretreated by the ozone in the step 2);
4) a front sand filter: a single-layer quartz sand filter material with the grain diameter d10 ═ is adopted0.9mm, the nonuniformity factor k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm. The design scale of the front sand filter is 8 ten thousand meters3And d, backwashing the filter material in the V-shaped filter tank by using air water for filtering the uniform-particle filter material. The filtration speed is 8m/h, the forced filtration speed is 9.6m/h, and the total filtration area is 438.36m2. The filter is divided into 6 grids which are arranged in double rows, and the single-grid filter area is 73.06m2。
5) Ozone-activated carbon treatment: the concentration of ozone water in the ozone-active carbon advanced treatment is 0.1 mu g/L, and the active carbon filter tank is 8 ten thousand meters3The design of the/d scale is that the area of a 4-grid filter chamber and a single-grid filter chamber is 73.06m2The filter material of the activated carbon filter adopts granular activated carbon, the thickness of the filter material is 1.9m, the granularity of 8 × 30 (equivalent to 2.38 × 0.6.6 mm) is adopted, the stacking density is 0.35-0.55 g/cm2The non-uniformity coefficient k80 is 1.9 to 2.0.
6) Filtering by a post sand filter: the design scale of the post-sand filter is 12 ten thousand meters3And d, filtering the material by adopting a uniform-particle filtering material air-water backflushing V-shaped filtering pool. The filtration rate is 9m/h, the forced filtration rate is 10.27m/h, and the total filtration area is 583.33m2. The filter is divided into 8 grids which are arranged in double rows, and the single-grid filter area is 73.06m2. A single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm.
7) After the filtration step of the post-sand filter, sodium hypochlorite is added to control the residual chlorine of the factory water to be 0.8mg/L +/-0.5 mg/L.
Obtaining a water sample before leaving a factory, and determining that the bromate content is 7.5 mu g/L, the chloral content is 7.1 mu g/L and the atrazine content is less than or equal to 0.5 mu g/L.
Comparative example 3
1) The water quantity of raw water entering the plant is 3000 t/h;
2) ozone pretreatment: adding ozone into the raw water in the step 1), controlling the concentration of the ozone to be 3mg/L, and allowing the ozone to contact for 3min to obtain a water sample pretreated by the ozone;
3) coagulating sedimentation: adding 30mg/L polyaluminium chloride into the water sample pretreated by the ozone in the step 2);
4) a front sand filter: a single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm. The design scale of the front sand filter is 8 ten thousand meters3And d, backwashing the filter material in the V-shaped filter tank by using air water for filtering the uniform-particle filter material. The filtration speed is 8m/h, the forced filtration speed is 9.6m/h, and the total filtration area is 438.36m2. The filter is divided into 6 grids which are arranged in double rows, and the single-grid filter area is 73.06m2。
5) Ozone-activated carbon treatment: the concentration of ozone water in the ozone-active carbon advanced treatment is 0.1 mu g/L, and the active carbon filter tank is 8 ten thousand meters3The design of the/d scale is that the area of a 4-grid filter chamber and a single-grid filter chamber is 73.06m2The filter material of the activated carbon filter adopts granular activated carbon, the thickness of the filter material is 1.9m, the granularity of 8 × 30 (equivalent to 2.38 × 0.6.6 mm) is adopted, the stacking density is 0.35-0.55 g/cm2The non-uniformity coefficient k80 is 1.9 to 2.0.
6) Filtering by a post sand filter: the design scale of the post-sand filter is 12 ten thousand meters3And d, filtering the material by adopting a uniform-particle filtering material air-water backflushing V-shaped filtering pool. The filtration rate is 9m/h, the forced filtration rate is 10.27m/h, and the total filtration area is 583.33m2. The filter is divided into 8 grids which are arranged in double rows, and the single-grid filter area is 73.06m2. A single-layer quartz sand filter material is adopted, the particle size d10 is 0.9mm, the non-uniformity coefficient k80 is 1.4, and the thickness is 1.2 m; the lower layer is provided with a coarse sand layer with the thickness of 50mm and the particle size of 2.0-4.0 mm.
7) After the filtration step of the post-sand filter, sodium hypochlorite is added to control the residual chlorine of the factory water to be 0.8mg/L +/-0.5 mg/L.
Obtaining a water sample before leaving a factory, and determining that the bromate content is 7.9 mu g/L, the chloral content is 4.3 mu g/L and the atrazine content is less than or equal to 0.5 mu g/L.

Claims (10)

1. A method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process is characterized by comprising the step of carrying out preoxidation treatment by using a preoxidant before ozone oxidation, wherein the preoxidant is a mixture of potassium permanganate and sodium bisulfite, and the treatment time of the preoxidant is 20 min.
2. The method of claim 1, wherein the volume ratio of the pre-oxidant to the stock solution is from 1mg/L to 5mg/L potassium permanganate; sodium bisulfite 1mg/L-5 mg/L.
3. The method of claim 1, wherein the volume ratio of the pre-oxidant to the stock solution is from 1mg/L to 2mg/L potassium permanganate; sodium bisulfite 5 mg/L.
4. The method of claim 1, wherein the step of effectively controlling the ozone oxidation byproducts and the ozone oxidation pollutants in the water treatment process further comprises an ozone oxidation step.
5. The method of claim 1, wherein the ozone concentration in the water in the ozone oxidation step is 1-5mg/L, preferably 3 mg/L.
6. The method of claim 1, wherein the method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process further comprises the steps of: coagulating sedimentation, primary filtration, ozone-activated carbon advanced treatment and secondary filtration.
7. The method of claim 1, wherein the flocculating agent used in the coagulating sedimentation step is polyaluminum chloride.
8. The method of claim 1, wherein the primary filtration is membrane filtration or pre-sand filtration.
9. The method as claimed in claim 1, wherein the ozone water concentration in the ozone-activated carbon advanced treatment is 0.05-0.20 μ g/L.
10. The method of claim 1, wherein the secondary filtration is membrane filtration or post-filtration sand filtration.
CN202010402939.6A 2020-05-13 2020-05-13 Method for effectively controlling ozone oxidation by-products and pollutants in water treatment process Pending CN111533316A (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN110482822A (en) * 2019-08-21 2019-11-22 河海大学 Advanced oxidation reaction and coagulating improve the preprocess method of excess sludge dehydrating effect
CN110697934A (en) * 2019-10-11 2020-01-17 江南大学 Method for reducing disinfection by-products of drinking water

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN110482822A (en) * 2019-08-21 2019-11-22 河海大学 Advanced oxidation reaction and coagulating improve the preprocess method of excess sludge dehydrating effect
CN110697934A (en) * 2019-10-11 2020-01-17 江南大学 Method for reducing disinfection by-products of drinking water

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