Up-flow adsorption and flocculation treatment equipment and water treatment process

Abstract

The invention relates to up-flow adsorption and flocculation treatment equipment and a water treatment process, the up-flow adsorption and flocculation treatment equipment comprises a mixing and flocculation device and further comprises a precipitation and adsorption device (15), the precipitation and adsorption device (15) is located on the right side of the mixing and flocculation device, and the mixing and flocculation device is communicated with the precipitation and adsorption device (15); a water inlet is formed in the left end of the mixing and flocculating device shell, a mixing stirrer (3) and a dosing pipe (4) are arranged in the mixing and flocculating device shell, and the dosing pipe (4) is used for filling a flocculating agent; a sludge bracket is arranged in the precipitation and adsorption device shell, and a water outlet is formed in the right end of the precipitation and adsorption device shell. Up-flow flocculation and an up-flow sludge bed (UASB) technology are combined, adsorption and filtration of raw water pollutants by flocs in the up-flow flocculation are combined with biodegradation of an activated sludge bed, water treatment is more convenient and reliable, the water treatment effect is effectively improved, and it is guaranteed that rainwater wastewater can be discharged after reaching the standard.

Description

Technical Field

[0001] The invention relates to the technical field of rainwater and wastewater treatment, and in particular to upflow adsorption flocculation treatment equipment and a water treatment process. Background Art

[0002] The natural water bodies in saline-alkali areas are alkaline, commonly known as "alkali bubbles". This kind of water body produces a huge amount of alkaline low-pollution wastewater during rainwater storage, which must meet the discharge standards before it can be discharged. At present, rainwater wastewater treatment technologies are divided into two categories. One is the physical treatment method, represented by the coagulation sedimentation filtration method. The flocs formed by the coagulation sedimentation method in this type of water body are small and have poor sedimentation properties; the other is the biochemical treatment process, represented by the biofilm method. The biofilm method has low biochemical properties and must be operated continuously. It is urgent to develop a composite rainwater wastewater treatment process to achieve the standard discharge of this type of water body and ensure the normal operation of the water body storage function. Summary of the invention

[0003] The purpose of the present invention is to provide an upflow adsorption flocculation treatment device and a water treatment process, which makes water treatment more convenient and reliable and effectively improves the water treatment effect.

[0004] Based on the same inventive concept, the present invention has two independent technical solutions:

[0005] 1. An upflow adsorption flocculation treatment equipment, comprising a mixing flocculation device, characterized in that: it also includes a sedimentation adsorption device (15), the sedimentation adsorption device (15) is located on the right side of the mixing flocculation device, and the mixing flocculation device is connected to the sedimentation adsorption device (15); a water inlet is provided at the left end of the mixing flocculation device shell, a mixing agitator (3) and a dosing pipe (4) are provided in the mixing flocculation device shell, and the dosing pipe (4) is used for adding flocculant; a sludge bracket is provided in the sedimentation adsorption device shell, and a water outlet is provided at the right end of the sedimentation adsorption device shell.

[0006] Furthermore, a dosing mixing chamber and a flocculation chamber are provided in the shell of the mixing and flocculation device, wherein the dosing mixing chamber is located on the left side of the flocculation chamber and the two chambers are interconnected; and the mixing agitator (3) and the dosing pipe (4) are located in the dosing mixing chamber.

[0007] Furthermore, a lower baffle (7) is provided between the dosing mixing chamber and the flocculation chamber, and the raw water in the dosing mixing chamber can flow into the flocculation chamber through the space above the lower baffle (7); an upper baffle (8) is provided between the flocculation chamber and the sedimentation adsorption device, and the raw water in the flocculation chamber can flow into the sedimentation adsorption device through the space below the upper baffle (8).

[0008] Furthermore, the water inlet of the mixing and flocculation device shell is located at the lower left end of the shell, and the water inlet is externally connected to a water inlet pipe (2); a disturbance arm (1) is provided outside the left end of the mixing and flocculation device shell.

[0009] Furthermore, the dosing pipe is connected to a dosing tank (6), and the dosing tank (6) is located above the shell of the mixing and flocculation device.

[0010] Furthermore, in the shell of the sedimentation adsorption device, a first sludge support (9), a second sludge support (10) and a third sludge support (11) are fixedly installed in sequence from left to right; a water outlet baffle (14) is provided at the right end of the shell of the sedimentation adsorption device, and the space above the water outlet baffle (14) forms the water outlet.

[0011] Furthermore, a first sludge discharge branch pipe, a second sludge discharge branch pipe, and a third sludge discharge branch pipe are respectively arranged vertically above the first sludge support (9), the second sludge support (10), and the third sludge discharge branch pipe; the first sludge discharge branch pipe, the second sludge discharge branch pipe, and the third sludge discharge branch pipe are connected to a transversely arranged sludge discharge main pipe (12); the sludge discharge main pipe (12) is externally connected to a reflux pump (13); the left end of the sludge discharge main pipe (12) is connected to a vertically arranged reflux pipe (5), and the reflux pipe (5) is located in the dosing mixing chamber of the mixing and flocculation device; the sludge in the shell of the sedimentation and adsorption device can be refluxed to the dosing mixing chamber of the mixing and flocculation device via the sludge discharge main pipe (12) and the reflux pipe (5).

[0012] 2. A water treatment process using the above-mentioned upflow adsorption flocculation treatment equipment, characterized in that it includes the following steps:

[0013] S1: Sediment mixing: The disturbance arm (1) is inserted into the mud-water interface of the water body, and the lighter part of the sediment is mixed with the raw water at the mud-water interface by means of disturbance;

[0014] S2: Dosing and mixing: the raw water after the sludge and water are mixed is introduced into the shell of the mixing flocculation device through the water inlet pipe (2), and flocculants and coagulants are added through the dosing pipe (4). The mixing and stirring device (3) is used to quickly stir the flocculants and coagulants so that the sludge particles and suspended solids in the raw water are fully in contact with each other;

[0015] S3: baffle flocculation: using the lower baffle (7) and the upper baffle (8), the raw water in the shell of the mixing flocculation device moves in an upward vertical flow, then moves in a reciprocating downward vertical flow, and then flows into the shell of the sedimentation adsorption device, so that the sediment particles and suspended solids in the raw water fully react with the flocculant;

[0016] S4: Sludge bed adsorption: After the raw water enters the shell of the sedimentation adsorption device, the rising flow rate decreases sharply, and the flocs gradually settle and stratify to form a sludge bed. The raw water flows through the sludge bed, where organic matter is adsorbed and utilized, and biochemical degradation occurs; fluoride ions, sludge particles and suspended solids are partially adsorbed and retained;

[0017] S5: Sedimentation: The coagulated flocs that are not completely adsorbed by the sludge bed continue to settle under the action of gravity, and the treated raw water flows out through the outlet of the sedimentation and adsorption device; part of the settled sludge flows back to the shell of the mixing flocculation device through the sludge discharge main pipe (12) and the return pipe (5), so that the remaining flocs and flocculation agents can be reused.

[0018] Furthermore, in the step S2, aluminum salt flocculant, microbial flocculant and polyacrylamide coagulant aid are added into the dosing tube.

[0019] Furthermore, in the step S2, the weight proportions of the aluminum salt flocculant, the microbial flocculant, and the polyacrylamide coagulant aid are 14-16, 1.1-1.3, and 0.9-1.1, respectively.

[0020] Beneficial effects of the present invention:

[0021] The present invention combines upflow flocculation and upflow sludge blanket (UASB) technology, combining the adsorption and filtration of raw water pollutants by flocs in upflow flocculation with the biodegradation of activated sludge blanket, making water treatment more convenient and reliable, effectively improving water treatment effects, and ensuring that rainwater and wastewater can meet discharge standards.

[0022] The water to be treated in the present invention can be treated by sediment mixing + drug mixing + baffle flocculation + sludge bed adsorption + sedimentation process to simultaneously remove alkalinity, chromaticity, organic matter, and fluoride ions, so that the effluent can be stabilized to meet the local water environment ecological compensation method and directly discharged into the nearby water body. After treatment, the effluent pH is ≦9, COD ≦50mg / L, fluoride ≦1.5mg / L, and transparency ≧25.

[0023] The present invention innovatively utilizes the in-situ sediment of the regulated water body, and organically combines biological flocculation, chemical flocculation and activated sludge, and enhances the flocculation and biodegradability of the raw water by mixing water and sediment; and utilizes in-situ sediment microorganisms to construct an activated sludge population to form a three-layer sludge structure, which effectively improves the biodegradability of alkaline rainwater regulation wastewater.

[0024] The invention has a simple process, flexible technology, small footprint, can be built on a movable platform, is suitable for various terrains, and has wide applicability.

[0025] The present invention can be widely applicable to various water qualities by adjusting the dosage ratio, the compound agent ratio and the reflux ratio, can be quickly started by adjusting the mixing ratio of raw water and bottom mud, and can be operated continuously or intermittently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the upflow adsorption flocculation treatment equipment of the present invention;

[0027] Figure 2 The figure is a flow chart of the water treatment process of the present invention.

[0028] The meaning of the numbers in the figure are: 1. disturbance arm; 2. water inlet pipe; 3. mixing agitator; 4. dosing pipe; 5. reflux pipe; 6. dosing tank; 7. lower baffle; 8. upper baffle; 9. first sludge support; 10. second sludge support; 11. third sludge support; 12. sludge discharge main pipe; 13. reflux pump; 14. water outlet baffle; 15. sedimentation adsorption device. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the upflow adsorption coagulation treatment process for alkaline water bodies described in the present invention in conjunction with the examples. For the sake of simplicity, this document cannot exhaustively list all the alternative technical features and implementation schemes included in the present invention. Specifically, the implementation schemes obtained by replacing any technical features and parameters in the present invention or combining any two or more technical features provided by the present invention should be within the scope of protection of the present invention.

[0030] Example 1: Upflow adsorption flocculation treatment equipment

[0031] like Figure 1 As shown, it includes a mixing flocculation device and a precipitation adsorption device 15 , wherein the precipitation adsorption device 15 is located on the right side of the mixing flocculation device, and the mixing flocculation device is connected to the precipitation adsorption device 15 .

[0032] A water inlet is provided at the left end of the mixing and flocculation device housing. The water inlet of the mixing and flocculation device housing is located at the lower left end of the housing. The water inlet is connected to a water inlet pipe 2. A disturbance arm 1 is provided outside the left end of the mixing and flocculation device housing. A mixing agitator 3 and a dosing pipe 4 are provided in the mixing and flocculation device housing. The dosing pipe 4 is used to add flocculants. A dosing mixing chamber and a flocculation chamber are provided in the mixing and flocculation device housing. The dosing mixing chamber is located on the left side of the flocculation chamber and is interconnected. A lower baffle 7 is provided between the dosing mixing chamber and the flocculation chamber. The raw water in the dosing mixing chamber can flow into the flocculation chamber through the space above the lower baffle 7. The mixing agitator 3 and the dosing pipe 4 are located in the dosing mixing chamber. An upper baffle 8 is provided between the flocculation chamber and the sedimentation adsorption device 15. The raw water in the flocculation chamber can flow into the sedimentation adsorption device through the space below the upper baffle 8. The dosing pipe is connected to a dosing tank 6. The dosing tank 6 is located above the mixing and flocculation device housing. During implementation, the pool depth is 1.2 m and the height of the lower baffle 7 is 0.8 m.

[0033] A sludge support is provided in the shell of the sedimentation adsorption device 15, and a water outlet is provided at the right end of the shell of the sedimentation adsorption device. In specific implementation, the first sludge support 9, the second sludge support 10 and the third sludge support 11 are fixedly installed in the shell of the sedimentation adsorption device from left to right in sequence; a water outlet baffle 14 is provided at the right end of the shell of the sedimentation adsorption device, and the space above the water outlet baffle 14 forms the water outlet. A first sludge discharge branch pipe, a second sludge discharge branch pipe, and a third sludge discharge branch pipe are vertically arranged above the first sludge support 9, the second sludge support 10, and the third sludge discharge branch pipe, respectively; the first sludge discharge branch pipe, the second sludge discharge branch pipe, and the third sludge discharge branch pipe are connected to a transversely arranged sludge discharge main pipe 12; the sludge discharge main pipe 12 is externally connected to a reflux pump 13, and the left end of the sludge discharge main pipe 12 is connected to a vertically arranged reflux pipe 5, and the reflux pipe 5 is located in the dosing mixing chamber of the mixing and flocculation device; the sludge in the shell of the sedimentation and adsorption device can be returned to the dosing mixing chamber of the mixing and flocculation device via the sludge discharge main pipe 12 and the reflux pipe 5.

[0034] Example 2: Water treatment process using the above-mentioned upflow adsorption flocculation treatment equipment

[0035] The following steps are involved:

[0036] S1: Sediment mixing: The disturbance arm 1 is inserted into the mud-water interface of the water body, and the lighter part of the sediment is mixed with the raw water on the mud-water interface by disturbance; the sediment carries humic acid, alkaliphilic microorganisms, and precipitated organic solids, which significantly improves the subsequent reaction effect.

[0037] S2: Dosing and mixing: The raw water after the sludge and water are mixed is introduced into the shell of the mixing flocculation device through the water inlet pipe 2, and flocculants and coagulants are added through the dosing pipe 4. The mixture is quickly stirred by the mixing agitator 3, which rotates at a speed of 170r / min to make the flocculants and coagulants fully contact with the sludge particles and suspended solids in the raw water. In the specific implementation, the dosing pipe adds aluminum salt flocculants, microbial flocculants, and polyacrylamide coagulants, with weight proportions of 15, 1.2, and 1.0 respectively. After precipitation, the sludge passes through the sludge main pipe 12, the reflux pump 13, and enters the reflux pipe 5, and flows back to the mixing flocculation device; the residual drugs and biological organic matter with flocculation effect participate in the adsorption flocculation process again;

[0038] S3: baffle flocculation: using the lower baffle 7 and the upper baffle 8, the raw water in the shell of the mixing flocculation device moves upward in vertical flow, and then moves reciprocatingly downward in vertical flow, and then flows into the shell of the sedimentation adsorption device, so that the sediment particles and suspended solids in the raw water fully react with the flocculant, gradually producing larger alum flocs. The rising flow rate shall not be too large, and during implementation, it is adopted to be 5-10mm / s; the materials swept by the floc net include sediment, organic matter, and biological sludge with adsorption effect brought by the sludge return, which enter the adsorption sedimentation device from the bottom.

[0039] S4: Sludge bed adsorption: When the raw water enters the adsorption sedimentation device, the rising flow rate decreases suddenly, and the flocs gradually settle and stratify to form a composite sludge bed. The composite sludge bed is divided into three layers from bottom to top: white mud, black mud, and oily mud. The main components of white mud are aluminum salt flocs, polyacrylamide and aged activated sludge. The flocs are loose and gray and blue-gray in color; the main components of black mud are activated sludge and organic matter, and the flocs are viscous and black; the main components of oily sludge are grease and humus, and there is a layer of microbial film on the surface of the flocs that can reflect light and is yellow-white. The first sludge support 9, the second sludge support 10, and the third sludge support 11 support the sludge bed. When the raw water flows through the composite sludge bed, the coagulated flocs are first intercepted by the white mud, and then the organic matter and nutrients in them are adsorbed, utilized, and degraded by the black mud. Raw water flows through the composite sludge bed, where organic matter is adsorbed and utilized, and biochemical degradation occurs; fluoride ions, sludge particles and suspended solids are partially adsorbed and retained, and partially carried away by the flowing water.

[0040] S5: Sedimentation: The coagulated flocs that are not completely adsorbed by the sludge bed continue to settle under the action of gravity, and the treated raw water flows out through the outlet of the sedimentation and adsorption device; some of the precipitated sludge flows back to the shell of the mixing flocculation device through the sludge discharge main pipe 12 and the return pipe 5, so that the remaining flocs and flocculation agents are reused. The return sludge is mainly the black mud and upper oil sludge described in step S4, and the return ratio is 15%.

[0041] The beneficial effects of the present invention are further illustrated below in conjunction with comparative experiments.

[0042] The raw water treated in this experiment is a natural alkaline regulating water body in a certain area of ​​Daqing, Heilongjiang Province. Its water inlet index is shown in Table 1.

[0043] Table 1 Inlet and outlet water quality indicators

[0044] Serial number project Influent water quality Outlet water quality 1 Fluoride (mg / L) ≤7.5 ≤1.5 2 pH 7～10 6～9 3 Permanganate index (mg / L) ≤50 ≤15 4 Ammonia nitrogen (mg / L) ≤15 ≤5(8) 5 COD(mg / L) ≤300 ≤50 6 BOD5(mg / L) ≤50 ≤10 7 Total phosphorus (mg / L) ≤5 ≤0.5

[0045] The alkaline wastewater adsorption flocculation treatment process provided in the above embodiment of the present invention is adopted, and the same raw water with the same water quality and the same location as in the embodiment is used. The effluent conditions of the treatment in each process step are shown in Table 2.

[0046] Table 2 Water treatment in each process step of the embodiment

[0047]

[0048]

[0049] Comparative Example

[0050] The wastewater treated in this comparative example and the raw water treated in the above-mentioned embodiment of the present invention are the same raw water obtained from the same location and using the same water quality as the same location in the embodiment. This comparative example does not adopt the upflow adsorption flocculation process proposed by the present invention. The effluent conditions of each process step are shown in Table 3.

[0051] Table 3 Comparative Example of the effluent treated in each process step

[0052]

[0053] By comparing the specific embodiments of the present invention with the comparative examples, it can be seen that the upflow adsorption flocculation process of the present invention is more effective in treating COD and fluoride in raw water.

[0054] From the comparison of the above data, it can be concluded that the upflow adsorption flocculation process of the present invention can improve the removal rate of COD, fluoride and total phosphorus by flocculation sedimentation, and utilizes the in-situ sludge of the storage water body to organically combine biological flocculation, chemical flocculation and activated sludge. While flocculation and sedimentation, the soluble organic matter in the water is simultaneously degraded and fluoride is precipitated, so that the pH of the raw water is effectively reduced.

[0055] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An upflow adsorption flocculation treatment equipment, comprising a mixing flocculation device, characterized in that: It also comprises a sedimentation adsorption device (15), the sedimentation adsorption device (15) is located on the right side of the mixing flocculation device, and the mixing flocculation device is connected to the sedimentation adsorption device (15); a water inlet is provided at the left end of the mixing flocculation device shell, a mixing agitator (3) and a dosing pipe (4) are provided in the mixing flocculation device shell, and the dosing pipe (4) is used for adding flocculant; a sludge support is provided in the sedimentation adsorption device shell, and a water outlet is provided at the right end of the sedimentation adsorption device shell.

2. The upflow adsorption flocculation treatment equipment according to claim 1, characterized in that: The mixing and flocculation device shell is provided with a dosing mixing chamber and a flocculation chamber, wherein the dosing mixing chamber is located on the left side of the flocculation chamber and the two chambers are interconnected; the mixing agitator (3) and the dosing pipe (4) are located in the dosing mixing chamber.

3. The upflow adsorption flocculation treatment equipment according to claim 2, characterized in that: A lower baffle (7) is provided between the dosing mixing chamber and the flocculation chamber, and the raw water in the dosing mixing chamber can flow into the flocculation chamber through the space above the lower baffle (7); an upper baffle (8) is provided between the flocculation chamber and the sedimentation adsorption device, and the raw water in the flocculation chamber can flow into the sedimentation adsorption device through the space below the upper baffle (8).

4. The upflow adsorption flocculation treatment equipment according to claim 1, characterized in that: The water inlet of the mixing and flocculation device shell is located at the lower left end of the shell, and the water inlet is externally connected to a water inlet pipe (2); a disturbance arm (1) is provided outside the left end of the mixing and flocculation device shell.

5. The upflow adsorption flocculation treatment equipment according to claim 1, characterized in that: The dosing pipe is connected to a dosing tank (6), and the dosing tank (6) is located above the shell of the mixing and flocculation device.

6. The upflow adsorption flocculation treatment equipment according to claim 2, characterized in that: A first sludge support (9), a second sludge support (10) and a third sludge support (11) are fixedly installed in sequence from left to right in the shell of the sedimentation adsorption device; a water outlet baffle (14) is provided at the right end of the shell of the sedimentation adsorption device, and the space above the water outlet baffle (14) forms the water outlet.

7. The upflow adsorption flocculation treatment equipment according to claim 6, characterized in that: A first sludge discharge branch pipe, a second sludge discharge branch pipe and a third sludge discharge branch pipe are respectively arranged vertically above the first sludge support (9), the second sludge support (10) and the third sludge discharge branch pipe; the first sludge discharge branch pipe, the second sludge discharge branch pipe and the third sludge discharge branch pipe are connected to a transversely arranged sludge discharge main pipe (12); the sludge discharge main pipe (12) is externally connected to a return pump (13); the left end of the sludge discharge main pipe (12) is connected to a vertically arranged return pipe (5), and the return pipe (5) is located in the dosing mixing chamber of the mixing and flocculation device; the sludge in the shell of the sedimentation and adsorption device can be returned to the dosing mixing chamber of the mixing and flocculation device via the sludge discharge main pipe (12) and the return pipe (5).

8. A water treatment process using the upflow adsorption flocculation treatment equipment according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Sediment mixing: The disturbance arm (1) is inserted into the mud-water interface of the water body, and the lighter part of the sediment is mixed with the raw water at the mud-water interface by means of disturbance; S2: Dosing and mixing: the raw water after the sludge and water are mixed is introduced into the shell of the mixing flocculation device through the water inlet pipe (2), and flocculants and coagulants are added through the dosing pipe (4). The mixing and stirring device (3) is used to quickly stir the flocculants and coagulants so that the sludge particles and suspended solids in the raw water are fully in contact with each other; S3: baffle flocculation: using the lower baffle (7) and the upper baffle (8), the raw water in the shell of the mixing flocculation device moves in an upward vertical flow, then moves in a reciprocating downward vertical flow, and then flows into the shell of the sedimentation adsorption device, so that the sediment particles and suspended solids in the raw water fully react with the flocculant; S4: Sludge bed adsorption: After the raw water enters the shell of the sedimentation adsorption device, the rising flow rate decreases sharply, and the flocs gradually settle and stratify to form a sludge bed. The raw water flows through the sludge bed, where organic matter is adsorbed and utilized, and biochemical degradation occurs; Fluoride ions, sludge particles and suspended solids are partially adsorbed and retained; S5: Sedimentation: The coagulated flocs that are not completely adsorbed by the sludge bed continue to settle under the action of gravity, and the treated raw water flows out through the outlet of the sedimentation and adsorption device; part of the settled sludge flows back to the shell of the mixing flocculation device through the sludge discharge main pipe (12) and the return pipe (5), so that the remaining flocs and flocculation agents can be reused.

9. The water treatment process according to claim 8, characterized in that: In the step S2, aluminum salt flocculant, microbial flocculant and polyacrylamide coagulant aid are added into the dosing tube.

10. The water treatment process according to claim 9, characterized in that: In the step S2, the weight proportions of the aluminum salt flocculant, the microbial flocculant, and the polyacrylamide coagulant aid are 14-16, 1.1-1.3, and 0.9-1.1, respectively.

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