A method and facility for treating sludge water discharged from a waterworks

Abstract

The present invention discloses a method and facility for treating sludge water from a waterworks. The method comprises the following steps: 1. collecting backwash water from a tap water filter and sludge water from a tap water sedimentation tank; 2. reusing the backwash water; and 3. treating the sludge water. The treatment facility comprises a backwash pool A, which comprises a backwash pool water distribution area, a backwash pool sedimentation area, and a backwash pool drainage area, arranged sequentially from left to right. The three water areas are connected by perforated decorative walls. A V-shaped sludge collecting trough is provided at the bottom of the backwash pool sedimentation area. A perforated sludge discharge pipe passes through the groove of the V-shaped sludge collecting trough. A submersible sludge pump is installed at the outlet of the perforated sludge discharge pipe, and sludge is pumped through the perforated sludge discharge pipe to a sludge water concentration and drying facility B. A submersible sewage pump is installed in the backwash pool drainage area, and the submersible sewage pump delivers water to a water distribution well / sedimentation tank. The technical effects of the present invention are: the backwash pool increases sludge-water separation, eliminates the risk of concentration of harmful substances, reduces the investment cost of sludge water concentration and drying, and saves water.

Description

Technical Field

[0001] The invention belongs to water treatment technology, and in particular relates to a method and a treatment facility for sludge water discharged from a waterworks. Background Art

[0002] Since the raw water drawn from the water plant's water intake contains sediment, it becomes clean water through sedimentation, filtration, and the addition of chemicals. The clean water is pressurized and enters thousands of households as tap water.

[0003] The following problems exist in the current water treatment process:

[0004] 1. The sludge generated during the sedimentation process has a high water content and needs to be dehydrated by a dehydrator in the water plant or dried naturally before it can be transported out. Using a single mechanical dehydration or natural drying that takes up a lot of space will require huge investment and occupy a lot of space when treating the sludge water.

[0005] 2. During the filtration process, sediment gradually clogs the filter media, reducing filtration efficiency and necessitating frequent backwashing of the filter with clean water. This backwash generates a large volume of water, making direct discharge uneconomical and wasteful. Instead, it must be returned to the distribution well / sedimentation tank and mixed with raw water drawn from the water intake for regeneration. However, the backwash tank lacks sludge-water separation, increasing the concentration of harmful substances such as sediment, aluminum, and bacterial counts, thereby reducing the quality of the water supply. Summary of the Invention

[0006] In response to existing water treatment problems, the present invention aims to provide a method for treating sludge water from a waterworks. This method can reduce the backflow of harmful substances in backwash water, improve water quality, and reduce investment costs for sludge treatment. The present invention also provides a sludge water treatment facility for a waterworks.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] In one aspect, the present invention provides a method for treating sludge water from a waterworks, comprising the following steps:

[0009] Step 1: Collect backwash water from the tap water filter and muddy water from the tap water sedimentation tank

[0010] Use the backwash water pool to collect the backwash water from the tap water filter, and use the sludge water concentration and drying facilities to collect the sludge water from the tap water sedimentation tank;

[0011] Step 2: Reuse backwash water

[0012] Sludge collection and discharge devices are installed in the backwash tank to separate mud and water. The sediment in the backwash tank is sent to the sludge water concentration and drying facility for removal, and the supernatant water is sent to the water distribution well for reuse to reduce the water consumption of the water plant;

[0013] Step 3: Treat the muddy water

[0014] The sludge water is dried naturally or mechanically dehydrated, and then mixed and dried. The water seeps down through the filter layer at the bottom of the natural drying tank to the sludge water concentration and drying facility. The mechanically dehydrated sludge water is sent to the sludge water concentration and drying facility, and the wastewater flowing out of the sludge water concentration and drying facility is returned to the backwash tank.

[0015] On the other hand, the sludge water treatment facility of the water plant provided by the present invention includes a backwash pool A into which the backwash water of the filter tank flows, and the backwash pool A includes a backwash pool water distribution area, a backwash pool sedimentation area and a backwash pool drainage area arranged in sequence from left to right. The three water areas are connected by perforated flower walls. A V-shaped mud collecting trough is provided at the bottom of the backwash pool sedimentation area. The perforated mud discharge pipe passes through the groove of the V-shaped mud collecting trough. The outlet of the perforated mud discharge pipe is equipped with a submersible sediment pump, and the sludge is pumped to the sludge water concentration and drying facility B through the perforated mud discharge pipe; the backwash pool drainage area is equipped with a submersible sewage pump, and the submersible sewage pump delivers water to the water distribution well / sedimentation tank.

[0016] The technical effects of the present invention are:

[0017] 1. The backwash pool of the present invention adds a technical means of mud and water separation, which discharges the sediment into the mud water concentration and drying facility B, and no longer returns to the water supply system, thereby reducing the backflow of harmful substances contained in the sediment and improving the water quality;

[0018] 2. The technology combines natural drying and mechanical dehydration to treat sludge water. Part of the sludge is dried naturally, and part is dehydrated mechanically. This overcomes the defects of existing technologies that use only mechanical dehydration, which requires huge investment for 100% sludge water treatment, or only natural drying, which takes up a lot of space.

[0019] 3. All kinds of wastewater can be returned to the treatment facility of the present invention, which saves water and eliminates the waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings of the present invention are as follows:

[0021] Figure 1 A schematic diagram of the invented waterworks sludge water treatment process and treatment facilities;

[0022] In the figure, backwash pool A: 1. Filter backwash water; 2. Backwash pool water distribution area; 3. Backwash pool sedimentation area; 4. Backwash pool drainage area; 5. Perforated flower wall; 6. V-shaped mud collection trough; 7. Perforated mud discharge pipe; 8. Submersible sediment pump; 9. Submersible sewage pump.

[0023] Sludge water concentration and drying facility B: 10. Water distribution area of ​​sludge water concentration and drying facility; 11. Mixer; 12. Sludge scraper; 13. Overflow weir; 14. Wastewater pipe; 15. Natural drying tank; 16. Filter layer; 17. Sedimentation area of ​​sludge water concentration and drying facility; 18. Sludge pipe; 19. Dehydrator; 20. Overflow water; 21. Sludge water; 801. Second submersible sediment pump; 901. Second submersible sewage pump. Implementation Method

[0024] The present invention will be further described below with reference to the accompanying drawings and examples:

[0025] In order to clearly describe the content of the invention, this patent application uses the directional words "upper", "lower", "left" and "right" for distinction. The "upper", "lower", "left" and "right" are determined based on the layout orientation of the above drawings. When the actual use direction of the present invention changes, the directional designation will change accordingly, which cannot be regarded as a limitation on the scope of patent protection.

[0026] like Figure 1 As shown, the method for treating sludge water discharged from a waterworks of the present invention is as follows:

[0027] Step 1: Collect backwash water from the tap water filter and muddy water from the tap water sedimentation tank

[0028] Use backwash pool A to collect backwash water from the tap water filter, and use sludge water concentration and drying facility B to collect sludge water from the tap water sedimentation tank;

[0029] Step 2: Reuse backwash water

[0030] A sludge collection and discharge device is installed in the backwash tank A to separate the mud and water. The sediment in the backwash tank A is sent to the sludge water concentration and drying facility for removal, and the supernatant water is sent to the water distribution well for reuse to reduce the water consumption of the water plant;

[0031] Step 3: Treat the muddy water

[0032] The sludge water is naturally dried or mechanically dehydrated, and then mixed and dried. The water seeps into the sludge water concentration and drying facility B through the filter layer at the bottom of the natural drying tank; the mechanically dehydrated sludge water is sent to the sludge water concentration and drying facility, and the wastewater flowing out of the sludge water concentration and drying facility B returns to the backwash tank A.

[0033] like Figure 1As shown, the sludge water treatment facility of the waterworks of the present invention includes a backwash pool A into which the backwash water of the filter tank flows. The backwash pool A includes a backwash pool water distribution area 2, a backwash pool sedimentation area 3 and a backwash pool drainage area 4 arranged from left to right. The three water areas are connected by a perforated flower wall 5. A V-shaped mud collecting trough 6 is provided at the bottom of the backwash pool sedimentation area 3. A perforated mud discharge pipe 7 passes through the groove of the V-shaped mud collecting trough 6. A submersible sediment pump 8 is installed at the outlet of the perforated mud discharge pipe 7. The sludge is pumped to the sludge water concentration and drying facility B through the perforated mud discharge pipe 7; the backwash pool drainage area 4 is equipped with a submersible sewage pump 9, which delivers water to the water distribution well / sedimentation tank.

[0034] like Figure 1 As shown, the mud water concentration and drying facility B includes a natural drying pool 15 and a mud water concentration and drying facility sedimentation area 17 that overlap each other. There is a filter layer 16 between the upper and lower layers. The mud water concentration and drying facility water distribution area 10 connected to the perforated mud pipe 7 of the backwash water pool A is located on one side of the mud water concentration and drying facility sedimentation area 17. The mud water concentration and drying facility water distribution area 10 is connected to the mud water concentration and drying facility sedimentation area 17 through the perforated flower wall 5. The mud water concentration and drying facility sedimentation area 17 includes a mixing pit, and a mixer 11 is installed in the mixing pit. Below the mixer 11, there is a mud pipe 18 and a second submersible sludge pump 801 connected to the natural drying pool 15.

[0035] Since the sludge obtained after the first sedimentation in the backwash tank A has too high a water content, it takes a long time to dry directly in the natural drying tank 15, or the drying efficiency is poor. It needs to be precipitated and concentrated again to reduce the water content of the sludge before being sent to the natural drying tank to improve the drying efficiency.

[0036] In addition, the mud outlet of the second submersible sludge pump 801 is connected to the dehydrator 19 to send excess sludge to the dehydrator 19 for dehydration and drying.

[0037] A scraper 12 is installed on the bottom surface of the sedimentation area 17 of the sludge water concentration and drying facility to scrape the settled sludge into the mixing pit. An overflow weir 13 is located above the sedimentation area 17, and a second submersible sewage pump 901 is installed below. The overflow weir and second submersible sewage pump 901 are connected to the backwash water distribution area 2 via a wastewater pipe 14. The overflow weir allows the supernatant in the top layer to flow out, while the waste is intercepted, enriched, and settled at the bottom of the tank.

[0038] The transportation process of the mud water of the present invention is as follows:

[0039] Filter backwash water 1 and overflow water 20 enter the backwash tank distribution area 2, flow through perforated decorative wall 5, and flow into the backwash tank sedimentation area 3 for sedimentation. The settled silt accumulates in the V-shaped sludge collecting trough 6. When the submersible sediment pump 8 is activated, the sludge is pumped out through the perforated sludge pipe 7 and sent to the sludge water concentration and drying facility distribution area 10. The settled water flows through the other side of the perforated decorative wall 5 into the backwash tank drainage area 4, and is transported to the distribution well / sedimentation tank by the submersible sewage pump 9.

[0040] The sludge water 21 includes sludge water from the perforated sludge pipe 7, sludge water from the sedimentation tank, and sludge water dehydrated by the dewatering machine 19. After being transported to the sludge water concentration and drying facility distribution area 10, this sludge water flows through the perforated decorative wall 5 into the sludge water concentration and drying facility sedimentation area 17 for further sedimentation. The settled clean water flows over the overflow weir 13 and returns to the backwash tank distribution area 2 through the wastewater pipe 14. The deep water below is pumped back along the wastewater pipe 14 to the backwash tank distribution area 2, completing the recycling process. The scraper 12 scrapes the settled sludge into the mixing pit. The sludge is then squeezed by the mixer 11. The second submersible sediment pump 801 is activated to pump the sludge out through the sludge pipe 18 and into the natural drying tank 15 for accumulation. After being filtered through the filter layer 16, the water seeps down to the sludge water concentration and drying facility sedimentation area 17 for further sedimentation, where the sludge is naturally dried.

[0041] When the amount of sludge exceeds the processing capacity of the natural drying tank 15, the excess sludge is sent to the dehydrator 19 for dehydration and drying.

Claims

1. A sludge water treatment facility for a waterworks, characterized by: The backwash pool A includes a backwash pool A into which filter backwash water (1) flows, and the backwash pool A includes a backwash pool water distribution area (2), a backwash pool sedimentation area (3) and a backwash pool drainage area (4) arranged in sequence from left to right. The three water areas are connected by a perforated flower wall (5). A V-shaped mud collecting trough (6) is provided at the bottom of the backwash pool sedimentation area (3). A perforated mud discharge pipe (7) passes through the groove of the V-shaped mud collecting trough (6). A submersible mud pump (8) is installed at the outlet of the perforated mud discharge pipe (7). The sludge is pumped to the mud water concentration and drying facility B through the perforated mud discharge pipe (7); a submersible sewage pump (9) is installed in the backwash pool drainage area (4), and the submersible sewage pump (9) delivers water to the water distribution well / pre-sedimentation tank; The mud water concentration and drying facility B comprises a natural drying pool (15) and a mud water concentration and drying facility sedimentation area (17) which are overlapped with each other, and a filter layer (16) is provided between the upper and lower layers; the mud water concentration and drying facility water distribution area (10) connected to the perforated mud pipe (7) of the backwash water pool A is located on one side of the mud water concentration and drying facility sedimentation area (17); the mud water concentration and drying facility water distribution area (10) is connected to the mud water concentration and drying facility sedimentation area (17) through a perforated flower wall; the mud water concentration and drying facility sedimentation area (17) comprises a mixing pit, a mixer (11) is installed in the mixing pit, and a mud pipe (18) and a second submersible sludge pump (801) are provided below the mixer (11) to connect to the natural drying pool (15); The mud discharge pipe outlet of the second submersible mud pump (801) is connected to the dehydrator (19); A sludge scraper (12) is installed on the sedimentation bottom surface of the sedimentation area (17) of the sludge water concentration and drying facility. An overflow weir (13) is provided at the upper part of the sedimentation area (17) of the sludge water concentration and drying facility, and a second submersible sewage pump (901) is installed at the lower part. The overflow weir and the second submersible sewage pump (901) are connected to the backwash water distribution area (2) through a wastewater pipe (14).

2. A method for using the sludge water treatment facility of a waterworks according to claim 1, characterized in that: The following steps are involved: Step 1: Collect backwash water from the tap water filter and muddy water from the tap water sedimentation tank Use backwash pool A to collect backwash water from the tap water filter, and use sludge water concentration and drying facility B to collect sludge water from the tap water sedimentation tank; Step 2: Reuse backwash water A sludge collection and discharge device is installed in the backwash pool A to separate mud and water. The sediment in the backwash pool A is sent to the sludge water concentration and drying facility B for removal, and the clear water from the backwash pool A is sent to the water distribution well for reuse to reduce the water consumption of the water plant. Step 3: Treat the muddy water The sludge water is mixed and dried through natural drying and mechanical dehydration. The water infiltrates from the bottom of the natural drying tank through the filter layer to the sedimentation area of ​​the sludge water concentration and drying facility. The sludge water from the perforated sludge pipe, the sludge water transported from the sedimentation tank and the sludge water dehydrated by the dehydrator are transported to the water distribution area of ​​the sludge water concentration and drying facility, and flow into the sedimentation area of ​​the sludge water concentration and drying facility through the perforated flower wall for sedimentation. The wastewater flowing out of the sedimentation area returns to the backwash pool A. The sludge scraper scrapes the sludge in the sedimentation area of ​​the sludge water concentration and drying facility to the mixing pit. After the sludge is squeezed by the mixer, the second submersible sludge pump is started to extract the sludge through the sludge pipe and send it to the natural drying tank and dehydrator.

Images