A treatment method and treatment system for preparing Yangtze River raw water into industrial water

Abstract

The application discloses a treatment method for preparing industrial water from Yangtze River raw water, which comprises the following steps: the Yangtze River raw water is introduced into an inclined plate sedimentation tank through a water inlet pump; 45-179 mg / L of aluminum sulfate solution is added into a stirring area of the inclined plate sedimentation tank, so that the aluminum sulfate medicament and the Yangtze River raw water are fully mixed; then the Yangtze River raw water enters a sedimentation area, and the sedimentation time of the Yangtze River raw water is 18-25 min; the Yangtze River raw water is introduced into an ozone catalytic reaction tower through a lifting pump, and the ozone catalytic tower is internally provided with modified biochar catalyst; the Yangtze River raw water enters the tower from the bottom of the ozone catalytic tower and flows out from bottom to top; the ozone generated by an ozone generator enters the catalytic tower from the bottom and then fills the whole catalytic tower; the modified biochar catalyst accounts for 85-95% of the volume of the whole ozone catalytic tower; the residence time of the Yangtze River raw water in the tower is 15-26 min; and the industrial water obtained after treatment can be used for industrial water of steel enterprises and the like and is environment-friendly and energy-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial water production, in particular to a treatment technology and method for purifying industrial water. BACKGROUND

[0002] The water resources in the Yangtze River Basin are very rich. At present, the available amount of water resources in the Yangtze River Basin exceeds 200 billion cubic meters, but the utilization rate is only more than 20%. Therefore, the development and utilization of the raw water in the Yangtze River is a direction worthy of in-depth study. The raw water in the lower reaches of the Yangtze River is complex. Due to local pollution, eutrophication and other reasons, the water quality is complex and variable, there are problems such as high turbidity, high suspended solids, and excessive bacteria. Research on it can greatly develop the water resources in the lower reaches of the Yangtze River and promote the rational utilization of water resources.

[0003] The research on the raw water in the Yangtze River can convert it into industrial water that can be used, which can significantly reduce the water cost of enterprises. So far, there is no process that can remove turbidity, suspended solids and microorganisms at the same time. It is urgent to develop an economical and efficient treatment process according to the water quality and quantity of the raw water in the Yangtze River to actively respond to the increasingly stringent environmental protection regulations. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to provide a treatment method for the raw water in the Yangtze River according to the water quality and quantity of the raw water in the lower reaches of the Yangtze River, which can effectively remove turbidity, suspended solids, microorganisms and the like in the raw water in the Yangtze River to produce high-quality industrial water. The high-quality industrial water is used for the production and reuse of water resources. Another technical problem to be solved by the present application is to provide a treatment system for implementing the treatment method.

[0005] The technical solution of the present application is a treatment method for preparing industrial water from the raw water in the Yangtze River, comprising the following steps.

[0006] The water quality of the raw water in the Yangtze River is as follows: turbidity is 82-145 NTU, suspended solids are 123-199 mg / L, total number of bacteria is 3.1-9.3 × 10 5 individuals / L, total coliform bacteria is 1.2-6.5 × 10 5 individuals / L, and Escherichia coli is 1.4-7.2 × 10 4 individuals / L.

[0007] a. The raw water in the Yangtze River enters the inclined plate sedimentation tank through the water inlet pump; the inclined plate sedimentation tank is divided into a stirring zone and a sedimentation zone; 45-179 mg / L of aluminum sulfate solution is added to the stirring zone of the inclined plate sedimentation tank to make the aluminum sulfate medicament and the raw water in the Yangtze River fully mixed; then it enters the sedimentation zone, and the sedimentation time of the raw water in the Yangtze River is 18-25 min;

[0008] b. The Yangtze River raw water enters the ozone catalytic reaction tower through the lifting pump, and the ozone catalytic tower is internally provided with a modified biochar catalyst; the modified biochar catalyst is prepared from water hyacinth as raw material, drying and roasting, and then roasting after being immersed in a chlorine salt solution; the Yangtze River raw water enters the tower from the bottom of the ozone catalytic tower and flows out from bottom to top; the ozone generated by the ozone generator enters the catalytic tower from the bottom and then fills the entire catalytic tower; the modified biochar catalyst accounts for 85-95% of the volume of the entire ozone catalytic tower; the residence time of the Yangtze River raw water in the tower is 15-26 min; and the industrial water is obtained after treatment.

[0009] The ozone and the modified biochar filler are combined to generate hydroxyl radicals, so that the microorganisms in the water can be efficiently and quickly killed.

[0010] According to the treatment method for preparing the Yangtze River raw water into industrial water, preferably, in step a, the mechanical stirring speed of the stirring zone is 45-65 r / min; and in step a, the residence time of the Yangtze River raw water in the stirring zone is 3-5 min.

[0011] According to the treatment method for preparing the Yangtze River raw water into industrial water, preferably, the preparation method of the modified biochar catalyst in step a comprises the following steps:

[0012] 1) Selecting biochar raw material: taking water hyacinth as the biochar raw material, washing the water hyacinth with water to clean the soil on the surface of the water hyacinth, drying, drying at 100-110 DEG C for 2-4 h, and naturally cooling, and putting the dried water hyacinth into a pulverizer to be pulverized, and then putting the pulverized water hyacinth into a grinder to be ground into fine powder; 2) carbonization material: putting the water hyacinth fine powder into a heating device, heating at a rate of 3-5 DEG C / min to 455-485 DEG C, maintaining the temperature for more than 20 min, naturally cooling, and forming water hyacinth fine powder biochar carbonization material; 3) biochar immersion: preparing a potassium chloride solution with a mass ratio of 5-15%, immersing the water hyacinth biochar carbonization material in the potassium chloride solution according to a liquid-solid ratio (volume ratio) of (4-5):1, immersing for 5-8 h, drying after filtration, heating at a rate of 4-6 DEG C / min to 815-875 DEG C, and cooling to form water hyacinth biochar; 4) biochar catalyst: preparing a ferric chloride solution with a mass ratio of 1-7%, immersing the water hyacinth biochar in the ferric chloride solution according to a liquid-solid ratio (volume ratio) of (2-3):1, immersing for 3-5 h, taking out the water hyacinth biochar, drying at room temperature, heating at a rate of 3-7 DEG C / min to 455-495 DEG C, maintaining the temperature for 1-1.5 h, and then naturally cooling to prepare the modified biochar catalyst.

[0013] According to the Yangtze River raw water preparation industrial water processing method, preferably, after step a through the inclined plate sedimentation tank, the water quality turbidity of the Yangtze River raw water is 23-67 NTU, and the suspended solids are 32-78 mg / L;The coagulation and sedimentation technology is effective for removing suspended solids and turbidity, and subsequent processes are needed to further remove microorganisms in the Yangtze River raw water.

[0014] According to the Yangtze River raw water preparation industrial water processing method, in the preparation of the above-mentioned catalyst, preferably, the water in step 1) is tap water;The washing frequency is 1-5 times.

[0015] According to the Yangtze River raw water preparation industrial water processing method, in the preparation of the above-mentioned catalyst, preferably, the fine powder in step 1) is 100-200 mesh water hyacinth fine powder.

[0016] According to the Yangtze River raw water preparation industrial water processing method, in the preparation of the above-mentioned catalyst, preferably, the constant temperature time in step 2) is 26-33 min.

[0017] According to the Yangtze River raw water preparation industrial water processing method, in the preparation of the above-mentioned catalyst, preferably, the mass concentration of the potassium chloride solution in step 3) is 7-11%;The mass concentration of the ferric chloride solution in step 4) is 2-5%.

[0018] According to the Yangtze River raw water preparation industrial water processing method, in the preparation of the above-mentioned catalyst, preferably, the specific surface area of the obtained modified biochar catalyst is 737-768 m 2 / g. The modified biochar catalyst prepared from water hyacinth in the application is specially developed for the Yangtze River raw water with high water quality turbidity, suspended solids and high total bacterial count.

[0019] The application also provides a treatment system for the above-mentioned Yangtze River raw water preparation industrial water processing method, which comprises a water inlet pump, an inclined plate sedimentation tank, a lifting pump, an ozone catalytic reaction tower, modified biochar filler and a water outlet pump;The water inlet pump is connected with the inclined plate sedimentation tank, the inclined plate sedimentation tank is connected with the lifting pump, the lifting pump is connected with the ozone catalytic reaction tower, and the ozone catalytic reaction tower is provided with modified biofiller;The outlet of the ozone catalytic reaction tower is connected with the water outlet pump.

[0020] Beneficial effects:

[0021] After the ozone catalytic reaction, the water quality turbidity of the Yangtze River raw water is 0.5-1 NTU, the suspended solids are 11-17 mg / L, the total bacterial count is 109-881 per liter, the total coliform bacteria are 0-2 per liter, and the Escherichia coli are 0-1 per liter. The water quality meets the industrial water standard, and the water is discharged into the industrial water pipe network through the drainage pump.

[0022] The application provides a purification treatment system for preparing Yangtze River raw water into industrial water. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The application provides a treatment system for preparing Yangtze River raw water into industrial water.

[0024] In the figure, the water inlet pump 1, the inclined plate sedimentation tank 2, the lifting pump 3, the ozone catalytic reaction tower 4, the modified biochar filler 5 and the water outlet pump 6. DETAILED DESCRIPTION

[0025] In order to better understand the application, the content of the application is further illustrated below in combination with examples, but the content of the application is not limited to the examples below.

[0026] The application is described in detail below in combination with the drawings and examples.

[0027] Example 1

[0028] The application provides a treatment system for preparing Yangtze River raw water into industrial water.

[0029] The water quality turbidity of the Yangtze River raw water is 145 NTU, the suspended substance is 187 mg / L, the total number of bacteria is 8.8*10 5 6 / L, the total coliform bacteria is 6.5*10 5 6 / L, and the Escherichia coli is 6.8*10 4 6 / L.

[0030] The Yangtze River raw water enters the inclined plate sedimentation tank through the water inlet pump. The inclined plate sedimentation tank is divided into a stirring zone and a sedimentation zone. 179 mg / L of aluminum sulfate is added to the stirring zone of the inclined plate sedimentation tank, the mechanical stirring speed of the stirring zone is 65 revolutions / min, the residence time is 5 min, and the aluminum sulfate medicament and the Yangtze River raw water are fully mixed. Subsequently, the Yangtze River raw water enters the sedimentation zone, and the sedimentation time of the Yangtze River raw water is 25 min. After passing through the inclined plate sedimentation tank, the water quality turbidity of the Yangtze River raw water is 55 NTU, and the suspended substance is 62 mg / L. The coagulation and sedimentation technology is effective in removing the suspended substance and turbidity, and subsequent processes are needed to further remove microorganisms in the Yangtze River raw water.

[0031] The Yangtze River raw water enters the ozone catalytic reaction tower through the lifting pump, and the ozone catalytic tower is internally provided with modified biochar fillers. The Yangtze River raw water enters the tower from the bottom of the ozone catalytic tower and flows out from bottom to top. The ozone generated by the ozone generator enters the catalytic tower from the bottom and then fills the entire catalytic tower. The modified biochar catalyst in the entire ozone catalytic tower accounts for 95% of the volume of the entire ozone catalytic tower, and the residence time of the Yangtze River raw water in the tower is 26 min. The combination of ozone and modified biochar fillers generates hydroxyl radicals, which can efficiently and quickly kill microorganisms in water. In addition, the modified biochar filler also has the function of adsorption, which can reduce the suspended solids and turbidity in the Yangtze River raw water

[0032] The present application is directed to the water quality characteristics of the Yangtze River raw water, and a modified biochar catalyst is developed and prepared. The preparation of the modified biochar catalyst: 1) selection of biochar raw materials: water hyacinth is used as the biochar raw material, first washed with tap water for 3 times to clean the soil on the surface of the water hyacinth, dried, placed in an oven at 105℃ for 4h, naturally cooled, and the dried water hyacinth is crushed into powder in a crusher, then ground into fine powder in a grinder, and screened to obtain water hyacinth fine powder with a particle size of 200 mesh. 2) carbonization material: the water hyacinth fine powder is placed in a muffle furnace, heated to 485℃ at a rate of 5℃ / min, kept at constant temperature for 33 min, naturally cooled, and water hyacinth fine powder biochar carbonization material is formed. 3) biochar: a potassium chloride solution with a mass ratio of 11% is prepared, and the water hyacinth biochar carbonization material is immersed in the potassium chloride solution at a liquid-solid ratio (volume ratio) of 5:1 for 8h, then filtered and dried, and placed in a muffle furnace, heated to 875℃ at a rate of 6℃ / min, and cooled to form water hyacinth biochar. 4) biochar catalyst: a ferric chloride solution with a mass ratio concentration of 5% is prepared, and the water hyacinth biochar is immersed in the ferric chloride solution at a liquid-solid ratio (volume ratio) of 3:1 for 5h, then taken out and dried at room temperature, and placed in a muffle furnace, heated to 495℃ at a rate of 7℃ / min, kept at constant temperature for 1.5h, then naturally cooled, and a modified biochar catalyst is prepared. The specific surface area of the modified biochar catalyst is 761m 2 / g.

[0033] After ozone catalytic reaction, the water quality of the Yangtze River raw water has a turbidity of 1 NTU, a suspended solid of 17 mg / L, a total number of bacteria of 672 / L, a total number of coliform bacteria of 2 / L, and an Escherichia coli of 1 / L. The water quality meets the industrial water standard, and is discharged into the industrial water pipe network through the drainage pump.

[0034] Example 2

[0035] A Yangtze River raw water preparation into industrial water treatment system, including water inlet pump, inclined plate sedimentation tank, lifting pump, ozone catalytic reaction tower, modified biochar filler, water outlet pump.

[0036] The water quality of the Yangtze River raw water is turbidity of 87 NTU, suspended solids of 134 mg / L, total bacteria of 3.7*10 5 5 4

[0037] The Yangtze River raw water enters the inclined plate sedimentation tank through the water inlet pump. The inclined plate sedimentation tank is divided into a stirring zone and a sedimentation zone. In the stirring zone of the inclined plate sedimentation tank, 45 mg / L of aluminum sulfate is added, the mechanical stirring speed of the stirring zone is 45 revolutions / min, the residence time is 3 min, and the aluminum sulfate agent and the Yangtze River raw water are fully mixed. Subsequently, it enters the sedimentation zone, and the sedimentation time of the Yangtze River raw water is 20 min. After passing through the inclined plate sedimentation tank, the water quality of the Yangtze River raw water is turbidity of 31 NTU, suspended solids of 39 mg / L. The coagulation and sedimentation technology is effective for removing suspended solids and turbidity, and subsequent processes are needed to further remove microorganisms in the Yangtze River raw water.

[0038] The Yangtze River raw water enters the ozone catalytic reaction tower through the lifting pump, and the ozone catalytic tower is internally provided with modified biochar fillers. The Yangtze River raw water enters the tower from the bottom and flows out from bottom to top. The ozone generated by the ozone generator enters the catalytic tower from the bottom and then fills the entire catalytic tower. The modified biochar catalyst in the entire ozone catalytic tower accounts for 85% of the volume of the entire ozone catalytic tower, and the residence time of the Yangtze River raw water in the tower is 15 min. The combination of ozone and modified biochar fillers generates hydroxyl radicals, which can efficiently and quickly kill microorganisms in water. In addition, the modified biochar filler also has adsorption function, which can reduce the suspended solids and turbidity in the Yangtze River raw water

[0039] ​​​The present application is directed to the water quality characteristics of Yangtze River raw water, and a modified biochar catalyst is developed. The preparation of the modified biochar catalyst: 1) selection of biochar raw material: water hyacinth is used as the biochar raw material, first wash with tap water for 3 times, clean the soil on the surface of the water hyacinth, dry, place in an oven at 105℃ for 3h, cool naturally, put the dry water hyacinth into a pulverizer to crush, grind into fine powder after crushing, and screen the 100 mesh water hyacinth powder. 2) carbonization material: put the water hyacinth powder into a muffle furnace, heat to 455℃ at a rate of 3℃ / min, keep constant temperature for 26min, cool naturally, and form water hyacinth powder biochar carbonization material. 3) biochar: prepare a potassium chloride solution with a mass ratio of 7%, immerse the water hyacinth biochar carbonization material in the potassium chloride solution according to a liquid-solid ratio (volume ratio) of 4:1, the immersion time is 5h, dry after filtering, put into a muffle furnace, heat to 821℃ at a rate of 4℃ / min, cool, and form water hyacinth biochar. 4) biochar catalyst: prepare a ferric chloride solution with a mass ratio concentration of 3%, immerse the water hyacinth biochar in the ferric chloride solution according to a liquid-solid ratio (volume ratio) of 2:1, immerse for 3h, take out the water hyacinth biochar, dry at room temperature, put into a muffle furnace, heat to 455℃ at a rate of 4℃ / min, keep constant temperature for 1h, then cool naturally, and obtain the modified biochar catalyst. The specific surface area of the modified biochar catalyst is 742m 2 / g.

[0040] After the ozone catalytic reaction, the water quality turbidity of the Yangtze River raw water is 0.5NTU, the suspended solids are 13mg / L, the total number of bacteria is 112 / L, the total coliform bacteria is 0 / L, and the Escherichia coli is 0 / L. The water quality meets the industrial water standard, and is discharged into the industrial water pipe network through the drainage pump.

[0041] In summary, the process of the treatment method for preparing industrial water from Yangtze River raw water has low production operation cost, uses biochar technology, reduces carbon dioxide emissions, fully embodies the energy saving and emission reduction effect, and is an environment-friendly green production process.

Claims

1. A treatment method for preparing Yangtze River raw water into industrial water, characterized in that: It comprises the following steps: The water quality of the Yangtze River raw water is as follows: turbidity is 82-145 NTU, suspended solids are 123-199 mg / L, total bacteria are 3.1-9.3×10 5 4 / L, total coliform bacteria are 1.2-6.5×10 5 4 / L, and Escherichia coli are 1.4-7.2×10 4 4 / L. a. The Yangtze River raw water enters the inclined plate sedimentation tank through the water inlet pump; 45~179 mg / L of aluminum sulfate solution is added in the stirring zone of the inclined plate sedimentation tank, so that the aluminum sulfate medicament and the Yangtze River raw water are fully mixed; then it enters the sedimentation zone, and the sedimentation time of the Yangtze River raw water is 18~25 min; b. The Yangtze River raw water enters the ozone catalytic reaction tower through the lifting pump, and the ozone catalytic tower is internally provided with a modified biochar catalyst; The modified biochar catalyst is prepared by using water hyacinth as raw material, drying and roasting, then impregnating with a chlorine salt solution and roasting again; the Yangtze River raw water enters the tower from the bottom of the ozone catalytic tower and flows out from bottom to top; the ozone generated by the ozone generator enters the ozone catalytic reaction tower from the bottom and then fills the entire ozone catalytic reaction tower; the modified biochar catalyst accounts for 85~95% of the volume of the entire ozone catalytic reaction tower; the residence time of the Yangtze River raw water in the tower is 15~26 min; the treated water is obtained; the preparation method of the modified biochar catalyst comprises the following steps: 1) Biochar raw material selection: water hyacinth is used as biochar raw material, first washed with water to clean the soil on the surface of the water hyacinth, dried, dried at 100-110℃ for 2~4 h, naturally cooled, and then put into a pulverizer to be pulverized, and then put into a grinder to be ground into fine powder; 2) Carbonization material: the water hyacinth fine powder is put into a heating device, heated to 455~485℃ at a rate of 3~5℃ / min, kept at constant temperature for more than 20 min, naturally cooled, and formed into water hyacinth fine powder biochar carbonization material; 3) Biochar impregnation: prepare a potassium chloride solution with a mass ratio of 5~15%, impregnate the water hyacinth biochar carbonization material in the potassium chloride solution at a liquid-solid volume ratio of (4~5):1, impregnate for 5~8 h, filter and dry, heat to 815~875℃ at a rate of 4~6℃ / min, and cool to form water hyacinth biochar; 4) Biochar catalyst: prepare a ferric chloride solution with a mass ratio concentration of 1~7%, impregnate the water hyacinth biochar in the ferric chloride solution at a liquid-solid volume ratio of (2~3):1, impregnate for 3~5 h, take out the water hyacinth biochar, dry at room temperature, heat to 455~495℃ at a rate of 3~7℃ / min, constant temperature roasting for 1~1.5 h, and then naturally cool to prepare the modified biochar catalyst.

2. The method of claim 1, wherein the Yangtze River raw water is prepared into industrial water. In step a, the mechanical stirring speed of the stirring zone is 45~65 revolutions / min; in step a, the residence time of the Yangtze River raw water in the stirring zone is 3~5 min.

3. The method of claim 1, wherein the method comprises: After step a, the water quality turbidity of the Yangtze River raw water after passing through the inclined plate sedimentation tank is 23~67 NTU, and the suspended solids are 32~78 mg / L; the coagulation and sedimentation technology is effective for removing suspended solids and turbidity, and further processes are needed to remove microorganisms in the Yangtze River raw water.

4. The method of claim 1, wherein the method comprises: In step 1, the water is tap water; the washing frequency is 1-5 times.

5. The method of claim 1, wherein the Yangtze River raw water is prepared into industrial water. In step 1, the fine powder is 100~200 mesh water hyacinth fine powder.

6. The method of claim 1, wherein the Yangtze River raw water is prepared into industrial water. In step 2, the constant temperature time is 26~33 min.

7. The method of claim 1, wherein the method comprises: Step 3) the mass concentration of the potassium chloride solution is 7-11%; Step 4) the mass concentration of the ferric chloride solution is 2-5%.

8. The method of claim 1, wherein the Yangtze River raw water is prepared into industrial water. The specific surface area of the obtained modified biochar catalyst is 737-768 m 2 / g.

9. The treatment system for use in the treatment method of preparing industrial water from Yangtze River raw water according to claim 1, characterized in that: The water inlet pump is connected with the inclined plate sedimentation tank, the inclined plate sedimentation tank is connected with the lifting pump, the lifting pump is connected with the ozone catalytic reaction tower, and the modified biological filler is arranged in the ozone catalytic reaction tower; and the outlet of the ozone catalytic reaction tower is connected with the water outlet pump.

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