Water plant feed water treatment system and water treatment method thereof

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a water plant feed water treatment system and a water treatment method thereof. The water plant feed water treatment system comprises a grid flocculation tank, an inclined tube sedimentation tank, a V-shaped filter tank, an activated carbon adsorption tank, a clean water tank and a water distribution pump station which are sequentially connected, the inclined tube sedimentation tank and the V-shaped filter tank are both connected with a sludge concentration tank, and the grid flocculation tank and the clean water tank are connected with a dosing room. According to the water supply treatment system for the water plant, raw water can be respectively treated, the working efficiency is improved, impurities in water can be effectively removed, sludge is discharged through the inclined tube sedimentation tank and the V-shaped filter tank, the water quality of the water plant after water treatment is safely and efficiently guaranteed, the production cost is low, and the water supply treatment system is suitable for large-scale popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a water plant water supply treatment system and a water treatment method thereof. Background Art

[0002] Water is the source of life, and obtaining safe drinking water is a basic need for human survival. Water accounts for about 70% of the body weight in the human body, maintaining the normal physiological functions necessary for the human body. Water participates in the digestion and absorption of food, metabolism in the body and the excretion of metabolites, temperature regulation and lubrication of joints, etc. It is an indispensable substance for maintaining life and metabolism. Healthy and clean water can enhance the body's immune ability and promote cell metabolism. According to a survey by the World Health Organization, 80% of diseases are related to drinking water, and poor water quality can cause a variety of diseases. Therefore, drinking water safety is of vital importance to humans. Due to natural and human factors, raw water contains a variety of impurities and may be contaminated by a variety of microorganisms such as bacteria, viruses and parasite eggs. The purpose of water purification in water plants is to remove these suspended substances, colloids, bacteria and other toxic and harmful components that may harm health, so that the purified water can meet the needs of drinking water for daily life. The conventional treatment of drinking water mainly includes coagulation, sedimentation, filtration, disinfection and other processes. Through the production process of tap water, the various suspended particles and colloidal substances in the water have been separated in the coagulation process, and the pathogenic microorganisms in the raw water have been eliminated in the disinfection process.

[0003] As people's living standards improve, their demand and requirements for healthy and safe drinking water are also gradually increasing, which also makes the requirements for drinking water treatment technology continue to increase. Water plants need to improve the efficiency and capacity of treatment processes to meet the growing demand for water supply. The general water plant process flow can no longer meet people's requirements for water quality. It is urgent to find a more efficient and more effective water plant process method so that people's drinking water safety can be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a water plant water treatment system and a water treatment method thereof to solve the technical problems raised by the above-mentioned background technology and to provide a more efficient water plant water treatment system that can effectively remove pollutants in water and ensure the health of people's drinking water.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A water treatment system for a water plant is provided, which is connected in sequence from a water inlet to a grid flocculation tank, an inclined tube sedimentation tank, a V-type filter tank, an activated carbon adsorption tank, a clear water tank and a water distribution pump station; the inclined tube sedimentation tank and the V-type filter tank are both connected to a sludge concentration tank; the grid flocculation tank and the clear water tank are connected to a dosing room.

[0007] Furthermore, in the above-mentioned water plant water treatment system, a turbidity meter I and a flow meter I are arranged at the inlet of the grid flocculation tank, a residual chlorine detector and a pH value detector are arranged between the activated carbon adsorption tank and the clear water tank, a turbidity meter II is arranged between the clear water tank and the water distribution pump station, and a flow meter II is arranged at the outlet of the water distribution pump station.

[0008] Furthermore, in the above-mentioned water plant water treatment system, a magnetic float ball water level gauge I is arranged in the grid flocculation tank, and a magnetic float ball water level gauge II is arranged in the clear water tank.

[0009] Furthermore, in the above-mentioned water plant water treatment system, the inclined tube sedimentation tank has an inclined tube length of 0.8-1.0 m, a diameter of 25-35 mm, a thickness of 0.4-0.5 mm, and is made of polypropylene.

[0010] Furthermore, in the above-mentioned water plant water treatment system, the length-to-width ratio of a single cell of the V-shaped filter is 2:1 to 4:1, the length of the filter is not less than 11m, and the air-water distribution trough in the center of the filter divides the width of the filter into two halves, and the width of each half does not exceed 4m.

[0011] Furthermore, in the above-mentioned water plant water treatment system, the inclined tube sedimentation tank and the V-type filter tank are connected to the sludge concentration tank by setting a sludge discharge valve I and a sludge discharge valve II respectively.

[0012] Furthermore, in the above-mentioned water plant water treatment system, the inclined tube sedimentation tank is connected to a sludge scraper.

[0013] Furthermore, in the above-mentioned water treatment system for a water plant, two stirring tanks are arranged in the dosing room, and the two stirring tanks are respectively an alum dosing stirring tank and a chlorine dosing stirring tank.

[0014] The water treatment method of the water plant water treatment system described in any one of the above comprises the following steps:

[0015] 1) The raw water first enters the grid flocculation tank from the water inlet, and polyaluminium chloride is added to the grid flocculation tank from the connected dosing room. A number of grids in the tank are used as flow disturbance devices. The flow velocity in the front and middle sections of the shaft is 0.12-0.14 m / s, the flow velocity in the last section is 0.1-0.14 m / s, and the flocculation time is 10-15 min. The water then enters the inclined tube sedimentation tank;

[0016] 2) After the water flows into the inclined tube sedimentation tank, the surface load of the inclined tube sedimentation tank is 9.0~11.0m 3 / (m 2 h), the suspended matter and particulate matter in the water flow settle to the bottom of the pool due to gravity and are dispersed at the bottom of the inclined tube. The sedimentation time is 2 to 5 minutes. The suspended matter and particulate matter settled at the bottom of the pool are discharged into the sludge thickening tank, and then the water flows into the V-type filter tank;

[0017] 3) After the water flows into the V-type filter, the V-type filter adopts air-water backwashing, and the quartz sand in the V-type filter is used to physically intercept the remaining suspended matter and particulate matter in the filtered water. The particle size of the quartz sand is 0.95-1.35mm, and the uneven coefficient Ks=1.2-1.5. The intercepted suspended matter and particulate matter are discharged into the sludge concentration tank, and the water flows into the activated carbon adsorption tank;

[0018] 4) After the water flows into the activated carbon adsorption tank, the activated carbon adsorption tank further removes the odor and pigment in the water. The regular flushing intensity of the activated carbon adsorption tank is 11~13L / (m 2 ·s), flushing lasts for 10 to 15 minutes, the interval between each flushing is 3 to 5 days, and the flushing expansion rate is 15 to 20%; in addition to regular flushing, large-flow flushing is also used regularly, with a flushing intensity of 15 to 18 L / (m 2 ·s), the flushing time is 8 to 12 minutes, the interval between each flushing is 12 to 15 days, the flushing expansion rate is 25 to 35%, and the water flows into the clean water tank;

[0019] 5) After the water flows into the clean water tank, liquid chlorine is added into the dosing room connected to the clean water tank for disinfection, so that the raw water meets the drinking water standard. The disinfected water is discharged from the outlet along with the water distribution pump station.

[0020] Furthermore, in the above water treatment method, in step 4), air-water combined flushing or an additional surface flushing method may be used.

[0021] The beneficial effects of the present invention are:

[0022] The water supply treatment system of the water plant of the present invention is provided with a grid flocculation tank, an inclined tube sedimentation tank, a V-type filter, an activated carbon adsorption tank and a clear water tank. The grid flocculation tank has a short flocculation time and a good flocculation effect, can reduce the workload and is convenient for management; the inclined tube sedimentation tank mainly based on the opposite flow inclined tube occupies a small area and has a good sedimentation effect, which can meet the requirements of most water plants; the V-type filter further removes impurities that cannot be intercepted by the inclined tube sedimentation tank to ensure the quality of the effluent, and the filter material of the V-type filter is homogeneous and has a strong pollution-containing capacity. The air-water backwashing is combined with the surface flushing, and the backwashing effect is good, which saves costs; the activated carbon adsorption tank further removes the odor and pigment in the water to ensure that the effluent water quality meets the standard. The raw water is gradually processed, which can not only precipitate the impurities in the water, but also discharge the mud in the raw water through the mud valve, and the odor and pigment that are difficult to remove are further removed in the activated carbon adsorption tank, which has low cost and good effect, and can ensure that the raw water quality meets the drinking water standard, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the water supply treatment system of the water plant of the present invention.

[0024] Figure 2 It is a schematic diagram of the grid flocculation tank layout.

[0025] Figure 3 This is a schematic diagram of an inclined tube sedimentation tank.

[0026] Figure 4 It is a schematic diagram of the V-type filter surface.

[0027] In the figure, 1-flow meter Ⅰ, 2-turbidimeter Ⅰ, 3-sludge discharge valve Ⅰ, 4-sludge discharge valve Ⅱ, 5-sludge scraper, 6-residual chlorine detector, 7-pH value detector, 8-turbidimeter Ⅱ, 9-flow meter Ⅱ, 10-magnetic float water level meter Ⅰ, 11-gas-water distribution tank, 12-magnetic float water level meter Ⅱ. DETAILED DESCRIPTION

[0028] Example 1

[0029] The present invention provides a water plant water treatment system and a water treatment method thereof:

[0030] A water treatment system for a water plant is connected in sequence from a water inlet to a grid flocculation tank, an inclined tube sedimentation tank, a V-type filter, an activated carbon adsorption tank, a clear water tank and a water distribution pump station; the inclined tube sedimentation tank and the V-type filter are connected to a sludge concentration tank by respectively setting a sludge discharge valve I and a sludge discharge valve II; the grid flocculation tank and the clear water tank are connected to a dosing room; two stirring tanks are arranged in the dosing room, and the two stirring tanks are respectively an alum dosing stirring tank and a chlorine dosing stirring tank.

[0031] The water plant sets turbidity meter I and flow meter I at the water inlet, that is, before the raw water enters the grid flocculation tank, to collect turbidity and flow of the raw water passing through the water inlet. The raw water at the water inlet enters the grid flocculation tank, and polyaluminium chloride (PAC) (polyaluminium chloride is often referred to as "alum" in the field of water treatment) is added to the grid flocculation tank from the alum mixing tank in the connected dosing room. A number of grids in the tank are used as flow disturbance devices, so that the water flow is driven by inertia during the movement, causing its motion state to change, thereby forming a higher velocity gradient to change the flocculation effect and form larger and more stable flocs. The relatively independent spatial units formed by the staggered partition walls inside the grid flocculation tank are vertical shafts. The flow velocities in the front and middle sections of the shaft are 0.12-0.14 m / s, and the flow velocity in the last section is 0.1-0.14 m / s. The flocculation time is 10-15 minutes. The water then flows into the inclined tube sedimentation tank. A magnetic float water level gauge I is also provided in the grid flocculation tank to monitor the water level in the tank.

[0032] After the raw water is treated in the grid flocculation tank, it enters the inclined tube sedimentation tank. Due to the effect of gravity, impurities such as suspended matter and particulate matter in the water flow will settle to the bottom of the pool and disperse at the bottom of the inclined tube. The length of the inclined tube is 0.8-1.0m, the diameter of the inclined tube is 25-35mm, the thickness is 0.4-0.5mm, the sedimentation time is 2-5min, and the inclined tube is made of polypropylene. The surface load of the inclined tube sedimentation tank adopts 9.0-11.0m 3 / (m 2 h), the water flows into the V-type filter tank. The inclined tube sedimentation tank is also equipped with a sludge scraper to remove impurities such as suspended matter and particulate matter that settle at the bottom of the tank. The inclined tube sedimentation tank is connected to the sludge concentration tank through the sludge discharge valve I, and the impurities such as suspended matter and particulate matter that settle at the bottom of the tank are discharged into the sludge concentration tank.

[0033] After passing through the inclined tube sedimentation tank, the water flows into the V-type filter tank. The length-to-width ratio of a single cell of the V-type filter tank is specified to be 2:1-4:1, and the length of the filter tank is not less than 11m. The air-water distribution tank in the center of the filter tank divides the width of the filter tank into two halves, and the width of each half does not exceed 4m. The V-type filter tank uses air-water backwashing, and uses quartz sand to physically intercept the remaining suspended matter and particulate matter in the filtered water to further remove the suspended pollutants in the filtered water. The particle size of the quartz sand is 0.95-1.35mm, and the non-uniformity coefficient Ks=1.2-1.5. The water flows into the activated carbon adsorption tank. The V-type filter tank is connected to the sludge concentration tank through the mud discharge valve II, and the intercepted suspended matter and particulate matter are discharged into the sludge concentration tank.

[0034] The water flowing through the V-type filter enters the activated carbon adsorption tank. The activated carbon adsorption tank further removes the odor and pigment in the water, so that the raw water is further treated. The regular flushing intensity of the activated carbon adsorption tank is 11~13L / (m 2 ·s), flushing duration is 10-15min, the interval between two flushings is 3-5d, and the flushing expansion rate is 15-20%; in addition to regular flushing, large-flow flushing should be used regularly, with a flushing intensity of 15-18L / (m 2 ·s), the flushing time is 8 to 12 minutes, the interval between two flushings is 12 to 15 days, the flushing expansion rate is 25 to 35%, and the water flows into the clean water tank. In order to improve the flushing effect, air-water combined flushing or adding surface flushing methods can be used.

[0035] After the water flows into the clear water tank, the chlorine mixing tank in the dosing room connected to the clear water tank injects liquid chlorine into the clear water tank to disinfect the water, so that the raw water meets the drinking water standard. A magnetic float water level gauge Ⅱ is installed in the clear water tank to monitor the liquid level of the water in the tank. The disinfected water is discharged from the outlet through the flow meter Ⅱ at the outlet of the water distribution pump station.

[0036] A residual chlorine detector and a pH value detector are also installed between the activated carbon adsorption tank and the clean water tank. The residual chlorine detector detects the residual chlorine in the effluent of the activated carbon adsorption tank, and the pH value detector collects the pH value of the effluent of the activated carbon adsorption tank. It can monitor the water quality after the activated carbon adsorption treatment in real time to ensure that the effluent water quality meets the relevant standards and requirements. The residual chlorine in the factory water should be less than or equal to 2 mg / L, and the pH value should be not less than 6.5 and not more than 8.5. A turbidity meter II is installed between the clean water tank and the water distribution pump station to measure the turbidity of the water passing through the clean water tank.

Claims

1. A water supply treatment system for a water plant, characterized in that: Starting from the water inlet, the grid flocculation tank, the inclined tube sedimentation tank, the V-type filter tank, the activated carbon adsorption tank, the clear water tank and the water distribution pump station are connected in sequence; the inclined tube sedimentation tank and the V-type filter tank are both connected to the sludge thickening tank; the grid flocculation tank and the clear water tank are connected to the dosing room.

2. A water supply treatment system for a water plant according to claim 1, characterized in that: A turbidity meter I and a flow meter I are arranged at the entrance of the grid flocculation tank, a residual chlorine detector and a pH value detector are arranged between the activated carbon adsorption tank and the clean water tank, a turbidity meter II is arranged between the clean water tank and the water distribution pump station, and a flow meter II is arranged at the outlet of the water distribution pump station.

3. A water supply treatment system for a water plant according to claim 1, characterized in that: A magnetic float water level gauge I is arranged in the grid flocculation tank, and a magnetic float water level gauge II is arranged in the clear water tank.

4. A water supply treatment system for a water plant according to claim 1, characterized in that: The inclined tube sedimentation tank has an inclined tube length of 0.8-1.0 m, a tube diameter of 25-35 mm, a thickness of 0.4-0.5 mm, and is made of polypropylene.

5. A water supply treatment system for a water plant according to claim 1, characterized in that: The V-shaped filter has a single cell length-to-width ratio of 2:1 to 4:1, a filter length of not less than 11 m, and an air-water distribution trough in the center of the filter divides the filter width into two halves, with each half having a width of no more than 4 m.

6. A water supply treatment system for a water plant according to claim 1, characterized in that: The inclined tube sedimentation tank and the V-type filter tank are connected to the sludge concentration tank by respectively setting a sludge discharge valve I and a sludge discharge valve II.

7. A water supply treatment system for a water plant according to claim 1, characterized in that: The inclined tube sedimentation tank is connected with a mud scraper.

8. A water supply treatment system for a water plant according to claim 1, characterized in that: Two stirring tanks are arranged in the dosing room, and the two stirring tanks are respectively a alum dosing stirring tank and a chlorine dosing stirring tank.

9. A water treatment method using the water plant water treatment system according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1) The raw water first enters the grid flocculation tank from the water inlet, and polyaluminium chloride is added to the grid flocculation tank from the connected dosing room. A number of grids in the tank are used as flow disturbance devices. The flow velocity in the front and middle sections of the shaft is 0.12-0.14 m / s, the flow velocity in the last section is 0.1-0.14 m / s, and the flocculation time is 10-15 min. The water then enters the inclined tube sedimentation tank; 2) After the water flows into the inclined tube sedimentation tank, the surface load of the inclined tube sedimentation tank is 9.0~11.0m 3 / (m 2 h), the suspended matter and particulate matter in the water flow settle to the bottom of the pool due to gravity and are dispersed at the bottom of the inclined tube. The sedimentation time is 2 to 5 minutes. The suspended matter and particulate matter settled at the bottom of the pool are discharged into the sludge thickening tank, and then the water flows into the V-type filter tank; 3) After the water flows into the V-type filter, the V-type filter adopts air-water backwashing, and the quartz sand in the V-type filter is used to physically intercept the remaining suspended matter and particulate matter in the filtered water. The particle size of the quartz sand is 0.95-1.35mm, and the uneven coefficient Ks=1.2-1.

5. The intercepted suspended matter and particulate matter are discharged into the sludge concentration tank, and the water flows into the activated carbon adsorption tank; 4) After the water flows into the activated carbon adsorption tank, the activated carbon adsorption tank further removes the odor and pigment in the water. The regular flushing intensity of the activated carbon adsorption tank is 11~13L / (m 2 ·s), flushing lasts for 10 to 15 minutes, the interval between each flushing is 3 to 5 days, and the flushing expansion rate is 15 to 20%; in addition to regular flushing, large-flow flushing is also used regularly, with a flushing intensity of 15 to 18 L / (m 2 ·s), the flushing time is 8 to 12 minutes, the interval between each flushing is 12 to 15 days, the flushing expansion rate is 25 to 35%, and the water flows into the clean water tank; 5) After the water flows into the clean water tank, liquid chlorine is added into the dosing room connected to the clean water tank for disinfection, so that the raw water meets the drinking water standard. The disinfected water is discharged from the outlet along with the water distribution pump station.

10. The water treatment method according to claim 9, characterized in that: In step 4), air-water combined flushing or additional surface flushing may be used.

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