Reclaimed water irrigation multi-factor blockage cooperative treatment system and method

Abstract

The invention relates to the technical field of water treatment, and provides a reclaimed water irrigation multi-factor blockage cooperative treatment system and method. The reclaimed water irrigation multi-factor blockage cooperative treatment system comprises a salt ion slow-release regulation and control unit, a microbial film control unit and a water storage and backwashing unit which are connected in series. The salt ion slow-release regulation and control unit is filled with a quartz sand supporting layer, an iron oxide layer, a cation exchange resin layer, an aluminum oxide particle layer and a coarse sand layer in a layered manner, and chemical scaling is inhibited through ion exchange and adsorption; the microbial film control unit comprises a functional bacteria bed layer for colonizing a non-EPS type functional flora competitive inhibition biological film; the water storage unit is provided with an EC sensor and a pressure sensor, and backwashing is automatically triggered. The technical problems of chemical scaling, biological membrane adhesion and physical blockage are synchronously solved through chemical-biological-physical multi-factor collaborative treatment, and a closed-loop automatic control technology is combined, so that the manual intervention frequency is reduced, and the operation efficiency and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a system and method for collaboratively managing multi-factor blockages in recycled water irrigation. Background Art

[0002] Traditional recycled water drip irrigation systems mainly rely on physical means such as sand and gravel sedimentation, cyclone filtration and mesh filter elements to prevent and control blockages. Although these can partially alleviate the blockage problem caused by physical particles such as silt, they lack effective means to inhibit the chemical scaling of calcium carbonate and the formation of microbial films that are prevalent in recycled water.

[0003] This invention achieves simultaneous control of chemical scaling, biofilm adhesion, and physical particle blockage in reclaimed water irrigation by constructing a coordinated multi-factor blockage control system and method using salt ion slow-release regulation, microbial membrane control, and water storage backwashing. Furthermore, through real-time pressure differential and conductivity monitoring, closed-loop automatic control is achieved, reducing the frequency of manual intervention and enhancing operational efficiency and reliability. Summary of the Invention

[0004] The present invention provides a system and method for coordinated management of multi-factor blockages in reclaimed water irrigation, which is used to solve the defects of the existing technology, such as the single-factor treatment architecture cannot cope with the multi-factor coupled blockage of high-salinity reclaimed water, lacks the ability to dynamically regulate salt ions and actively inhibit biofilms, and relies on manual backflushing, resulting in low operation and maintenance efficiency.

[0005] In one aspect, the present invention provides a multi-factor blockage collaborative management system for reclaimed water irrigation, comprising: a salt ion slow-release control unit, a microbial membrane control unit, and a water storage and backwashing unit connected in series; The water inlet of the salt ion slow-release control unit is connected to the regenerated water source, and the bottom water outlet is connected to the water inlet of the microbial membrane control unit through a peristaltic pump; The water outlet of the microbial membrane control unit is connected to the water storage and backwashing unit through gravity flow; The water storage and backwashing unit is connected to the backwashing water inlet of the salt ion slow-release control unit and the backwashing water inlet of the microbial membrane control unit respectively through a high-pressure pump; A backwash outlet of the salt ion slow-release regulating unit is provided at the bottom of the salt ion slow-release regulating unit; A microbial membrane control unit backwash outlet is provided at the bottom of the microbial membrane control unit.

[0006] According to the multi-factor blockage collaborative management system for reclaimed water irrigation provided by the present invention, the salt ion slow-release control unit is filled with the following layers: From bottom to top, there are quartz sand support layer, iron oxide layer, cation exchange resin layer, alumina particle layer and coarse sand layer; The iron oxide layer uses Fe3O4 or Fe2O3 particles with a particle size of 0.3~1.0mm; The cation exchange resin layer is filled with acrylic acid or methacrylic acid porous resin; The alumina particle layer has a specific surface area of ​​>150m 2 / g, pseudo-boehmite particles with a particle size of 1.5~3.0mm.

[0007] According to the multi-factor blockage collaborative management system for recycled water irrigation provided by the present invention, two layers of non-woven fabric yarn are provided in the coarse sand layer, the particle size of the coarse sand is 1.0-2.5 mm, and the height of the coarse sand layer is 15-20 cm; The salt ion slow-release regulating unit is provided with a low-speed guide baffle.

[0008] According to the multi-factor blockage collaborative treatment system for reclaimed water irrigation provided by the present invention, the microbial membrane control unit is filled with the following layers: From bottom to top, there are quartz sand layer, functional fungus bed layer and ceramsite layer; The functional bacterial bed layer is composed of a composite of modified biochar and three-dimensional filler, has a particle size of 8 to 20 mm, and is colonized with non-EPS type functional bacteria.

[0009] According to a multi-factor blockage collaborative management system for reclaimed water irrigation provided by the present invention, a first EC sensor is provided at the water inlet of the salt ion slow-release control unit; A second EC sensor is provided at the water outlet of the salt ion slow-release regulating unit.

[0010] According to the multi-factor blockage collaborative treatment system for reclaimed water irrigation provided by the present invention, a first pressure sensor is provided at the water inlet of the microbial membrane control unit; A second pressure sensor is provided at the water outlet of the microbial membrane control unit.

[0011] According to a multi-factor blockage collaborative management system for reclaimed water irrigation provided by the present invention, the water storage and backwashing unit is equipped with a control unit, which automatically triggers backwashing when any of the following conditions is met: (a) The conductivity at the outlet of the salt ion slow-release control unit continuously increased by more than 15% compared with the inlet; (b) The pressure difference between the inlet and outlet of the microbial membrane control unit ΔP ≥ 0.15 MPa.

[0012] On the other hand, the present invention also provides a method for collaboratively managing multi-factor blockage in recycled water irrigation, comprising the following steps: (1) Pre-exchange and activate the cation exchange resin of the salt ion slow-release control unit, acid-wash the iron oxide particles, and pre-cultivate the functional bacterial flora on the filler of the functional bacterial bed for 5 to 15 days; (2) The regenerated water enters the salt ion slow-release control unit and flows through the coarse sand layer, alumina particle layer, cation exchange resin layer and iron oxide layer in sequence to remove hardness ions and inhibit scaling; (3) The effluent from step (2) enters the microbial film control unit, where the colonized bacteria in the functional bacterial bed inhibit biofilm formation; (4) When the conductivity at the outlet of the salt ion slow-release control unit increases by more than 15% compared with the inlet, or the pressure difference ΔP of the microbial membrane control unit is ≥ 0.15 MPa, the water storage and backwashing unit is started for backwashing.

[0013] According to a method for synergistically controlling multi-factor blockage in reclaimed water irrigation provided by the present invention, in step (1), the pre-exchange activation is performed by circulating a 2-10% NaCl solution for 20-40 minutes and then rinsing with pure water; the pickling treatment is performed by soaking in a 0.5-1.5% HCl solution for 5-15 minutes and then neutralizing with pure water.

[0014] According to a multi-factor blockage collaborative treatment method for reclaimed water irrigation provided by the present invention, in step (2), the salinity of the reclaimed water inlet is 2000-3000 μS / cm, and the hardness ion is greater than 100 mg / L; In step (4), the backwashing lasts for 5 to 10 minutes, and the backwash water is introduced into the sedimentation tank for treatment or reuse.

[0015] The system and method for coordinated management of multi-factor blockage in recycled water irrigation provided by the present invention have the following advantages over the prior art: (1) The system and method for coordinated management of multi-factor blockage in recycled water irrigation provided by the present invention solve multiple blockage problems such as chemical scaling, biofilm adhesion, and physical particle blockage in recycled water irrigation, realize multi-factor coordinated management, and significantly improve the comprehensive anti-blockage capability.

[0016] (2) The multi-factor blockage collaborative treatment system and method for recycled water irrigation provided by the present invention monitors the conductivity change through the first / second EC sensor, monitors the pressure difference through the first / second pressure sensor, and automatically switches the high-pressure pump and the three-way valve to perform flushing through the control unit. This solves the problems of frequent manual inspections and low operation and maintenance efficiency in traditional treatment methods, realizes intelligent closed-loop control, and greatly improves operation and maintenance efficiency.

[0017] (3) The present invention provides a system and method for the coordinated management of multi-factor blockages in recycled water irrigation, in which the cation exchange resin layer can be regenerated by acid washing, and the iron oxide layer can be reactivated by HCl soaking, thereby solving the problems of easy loss of functional materials and high long-term operating costs, achieving efficient reuse of functional materials, and reducing long-term operating costs.

[0018] (4) The multi-factor blockage collaborative treatment system and method for reclaimed water irrigation provided by the present invention solves the problems of poor water quality adaptability and weak scalability in traditional treatment methods through the optimization of the particle size gradient of the layered filler of the salt ion unit, the replaceable filler type of the functional bacterial bed layer of the microbial unit, and the independent design of the backwash water channel, realizes the modular structure to adapt to complex water quality, and enhances scalability.

[0019] (5) The multi-factor blockage coordinated management system and method for recycled water irrigation provided by the present invention solves the problems of low water resource utilization and poor environmental compatibility by introducing backwash water into the sedimentation tank for reuse, reducing energy consumption through gravity flow design, and inhibiting the addition of functional bacteria to inhibit the need for chemical addition, thereby achieving efficient utilization of water resources and improving environmental compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 2. It is a structural diagram of a multi-factor blockage collaborative management system for recycled water irrigation provided by an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the salt ion slow-release control unit provided in an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the microbial membrane control unit provided by an embodiment of the present invention.

[0022] Reference numerals: 1. Salt ion slow-release regulation unit; 2. Microbial membrane control unit; 3. Water storage and backwash unit; 4. Peristaltic pump; 5. High-pressure pump; 11. Quartz sand support layer; 12. Iron oxide layer; 13. Cationic exchange resin layer; 14. Alumina particle layer; 15. Coarse sand layer; 16. Non-woven yarn; 17. Low-speed guide baffle; 18. First EC sensor; 19. Second EC sensor; 21. Quartz sand layer; 22. Functional bacterial bed layer; 23. Ceramsite layer; 24. First pressure sensor; 25. Second pressure sensor; 31. Backwash water inlet of salt ion slow-release regulation unit; 32. Backwash water inlet of microbial membrane control unit; 33. Backwash water outlet of salt ion slow-release regulation unit; 34. Backwash water outlet of microbial membrane control unit. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] The following combination Figure 1-Figure 3 The present invention describes a system and method for collaboratively managing multi-factor blockages in recycled water irrigation.

[0025] Figure 1 It is a structural diagram of the multi-factor blockage collaborative management system for recycled water irrigation provided by an embodiment of the present invention.

[0026] like Figure 1 As shown, the reclaimed water irrigation multi-factor blockage collaborative control system provided by the embodiment of the present invention includes: a salt ion slow-release regulation unit 1, a microbial film control unit 2 and a water storage and backwash unit 3 connected in series; the water inlet of the salt ion slow-release regulation unit 1 is connected to the reclaimed water source, and its bottom water outlet is connected to the water inlet of the microbial film control unit 2 through a peristaltic pump 4; the water outlet of the microbial film control unit 2 is connected to the water storage and backwash unit 3 through gravity flow; the water storage and backwash unit 3 is respectively connected to the salt ion slow-release regulation unit backwash inlet 31 and the microbial film control unit backwash inlet 32 ​​through a high-pressure pump 5; a salt ion slow-release regulation unit backwash outlet 33 is set at the bottom of the salt ion slow-release regulation unit 1; a microbial film control unit backwash outlet 34 is set at the bottom of the microbial film control unit 2.

[0027] Figure 2 Schematic diagram of the structure of the salt ion slow-release control unit provided in an embodiment of the present invention.

[0028] like Figure 2 As shown, a multi-factor blockage collaborative management system for reclaimed water irrigation provided by an embodiment of the present invention, wherein the interior of the salt ion slow-release regulation unit 1 is filled in layers: from bottom to top, there are a quartz sand support layer 11, an iron oxide layer 12, a cation exchange resin layer 13, an aluminum oxide particle layer 14 and a coarse sand layer 15; two layers of non-woven yarn 16 are arranged in the coarse sand layer 15; the salt ion slow-release regulation unit 1 is provided with a low-speed guide baffle 17; a first EC sensor 18 is provided at the water inlet of the salt ion slow-release regulation unit 1; and a second EC sensor 19 is provided at the water outlet of the salt ion slow-release regulation unit 1.

[0029] Figure 3 Schematic diagram of the structure of the microbial membrane control unit provided by an embodiment of the present invention.

[0030] like Figure 3As shown, in the reclaimed water irrigation multi-factor blockage collaborative management system provided by an embodiment of the present invention, the microbial film control unit 2 is filled in layers: from bottom to top, there is a quartz sand layer 21, a functional bacterial bed layer 22 and a ceramsite layer 23; a first pressure sensor 24 is provided at the water inlet of the microbial film control unit 2; and a second pressure sensor 25 is provided at the water outlet of the microbial film control unit 2.

[0031] In the present invention, the iron oxide layer 12 is made of Fe3O4 or Fe2O3 particles with a particle size of 0.3-1.0 mm, preferably 0.5-0.8 mm, and more preferably 0.6-0.7 mm.

[0032] In the present invention, the cation exchange resin layer 13 is filled with acrylic or methacrylic porous resin, and the alumina particle layer 14 has a specific surface area of ​​>150m 2 / g, pseudo-boehmite particles with a particle size of 1.5~3.0mm.

[0033] In the present invention, the particle size of the coarse sand in the coarse sand layer is 1.0-2.5 mm, preferably 1.3-2.2 mm, more preferably 1.6-1.8 mm; the height of the coarse sand layer is 15-20 cm, preferably 16-19 cm, more preferably 17-18 cm.

[0034] In the present invention, the functional bacterial bed layer 22 is composed of a composite of modified biochar and three-dimensional filler, with a particle size of 8 to 20 mm, preferably 11 to 17 mm, and more preferably 13 to 15 mm, and is colonized with non-EPS type functional bacteria.

[0035] In the present invention, the water storage and backwashing unit 3 is equipped with a control unit, which automatically triggers backwashing when any of the following conditions is met: (a) the conductivity at the outlet of the salt ion slow-release control unit 1 continuously increases by more than 15% compared with the inlet; (b) the pressure difference ΔP at the inlet and outlet of the microbial membrane control unit 2 is ≥0.15MPa.

[0036] On the other hand, the present invention also provides a method for collaboratively managing multi-factor blockage in recycled water irrigation, comprising the following steps: (1) Pre-exchange and activate the cation exchange resin of the salt ion slow-release control unit 1, perform acid washing on the iron oxide particles, and pre-cultivate the functional bacterial flora on the filler of the functional bacterial bed 22 for 5 to 15 days, preferably 7 to 10 days, and more preferably 8 to 9 days; (2) The regenerated water enters the salt ion slow-release control unit 1 and flows through the coarse sand layer 15, the alumina particle layer 14, the cation exchange resin layer 13 and the iron oxide layer 12 in sequence to remove hardness ions and inhibit scaling; (3) The effluent from step (2) enters the microbial film control unit 2, where the colonized bacteria in the functional bacterial bed layer 22 inhibit biofilm formation; (4) When the conductivity at the outlet of the salt ion slow-release control unit 1 increases by more than 15% compared with the inlet, or the pressure difference ΔP of the microbial membrane control unit 2 is ≥ 0.15 MPa, the water storage and backwash unit 3 is started for backwashing.

[0037] In step (1) of the present invention, the pre-exchange activation adopts 2-10% NaCl solution circulation for 20-40 minutes and then pure water washing, preferably 4-8% and 25-35 minutes, respectively, and further preferably 5-6% and 28-32 minutes, respectively; the pickling treatment adopts 0.5-1.5% HCl soaking for 5-15 minutes and then pure water neutralization, preferably 0.8-1.2% and 8-12 minutes, respectively.

[0038] In step (2) of the present invention, the salt content of the regenerated water inlet is 2000-3000 μS / cm, and the hardness ion is greater than 100 mg / L.

[0039] In step (4) of the present invention, the backwashing lasts for 5 to 10 minutes, and the backwash water is introduced into a sedimentation tank for treatment or reuse.

[0040] Example The water quality improvement effect of the effluent is shown in Table 1 below by using the multi-factor blockage collaborative management system for recycled water irrigation provided in this application for water treatment.

[0041] Table 1 Improvement effect of effluent water quality

[0042] The anti-clogging effects of the water treatment and non-treatment systems using the multi-factor blockage coordinated management system for recycled water irrigation provided in this application are shown in Table 2 below.

[0043] Table 2 Anti-blocking effect

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-factor blockage collaborative management system for recycled water irrigation, characterized in that: It includes: a salt ion slow-release control unit (1), a microbial membrane control unit (2) and a water storage and backwashing unit (3) connected in series; The water inlet of the salt ion slow-release control unit (1) is connected to the regenerated water source, and the bottom water outlet thereof is connected to the water inlet of the microbial membrane control unit (2) via a peristaltic pump (4); The water outlet of the microbial membrane control unit (2) is connected to the water storage and backwashing unit (3) through gravity flow; The water storage and backwashing unit (3) is connected to the backwashing water inlet (31) of the salt ion slow-release control unit and the backwashing water inlet (32) of the microbial membrane control unit respectively through a high-pressure pump (5); A salt ion slow-release regulating unit backwash outlet (33) is provided at the bottom of the salt ion slow-release regulating unit (1); A microbial membrane control unit backwash outlet (34) is provided at the bottom of the microbial membrane control unit (2).

2. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 1 is characterized in that: The salt ion slow-release control unit (1) is filled with the following layers: From bottom to top, there are a quartz sand support layer (11), an iron oxide layer (12), a cation exchange resin layer (13), an aluminum oxide particle layer (14), and a coarse sand layer (15); The iron oxide layer (12) is made of Fe3O4 or Fe2O3 particles with a particle size of 0.3-1.0 mm; The cation exchange resin layer (13) is filled with acrylic acid or methacrylic acid porous resin; The alumina particle layer (14) has a specific surface area of ​​>150m 2 / g, pseudo-boehmite particles with a particle size of 1.5~3.0mm.

3. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 2 is characterized in that: Two layers of non-woven fabric (16) are provided in the coarse sand layer (15), the particle size of the coarse sand is 1.0-2.5 mm, and the height of the coarse sand layer (15) is 15-20 cm; The salt ion slow-release regulating unit (1) is provided with a low-speed flow guide baffle (17).

4. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 1 is characterized in that: The microbial membrane control unit (2) is filled with layers: From bottom to top, there are quartz sand layer (21), functional fungus bed layer (22) and ceramsite layer (23); The functional bacterial bed layer (22) is composed of a composite of modified biochar and a three-dimensional filler, has a particle size of 8 to 20 mm, and is colonized with non-EPS type functional bacteria.

5. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 1 is characterized in that: A first EC sensor (18) is provided at the water inlet of the salt ion slow-release control unit (1); A second EC sensor (19) is provided at the water outlet of the salt ion slow-release regulating unit (1).

6. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 1 is characterized in that: A first pressure sensor (24) is provided at the water inlet of the microbial membrane control unit (2); A second pressure sensor (25) is provided at the water outlet of the microbial membrane control unit (2).

7. The reclaimed water irrigation multi-factor blockage collaborative management system according to claim 1 is characterized in that: The water storage and backwashing unit (3) is equipped with a control unit, which automatically triggers backwashing when any of the following conditions is met: (a) Salt ion slow-release control unit (1) The outlet conductivity continuously increases by more than 15% compared with the inlet; (b) The pressure difference between the inlet and outlet of the microbial membrane control unit (2) ΔP ≥ 0.15 MPa.

8. A method for collaboratively managing multi-factor blockage in recycled water irrigation, using the system described in any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Pre-exchange and activate the cation exchange resin of the salt ion slow-release control unit (1), perform acid washing on the iron oxide particles, and pre-cultivate the functional bacterial flora on the filler of the functional bacterial bed (22) for 5 to 15 days; (2) The regenerated water enters the salt ion slow-release control unit (1), and flows through the coarse sand layer (15), the alumina particle layer (14), the cation exchange resin layer (13) and the iron oxide layer (12) in sequence, removing hardness ions and inhibiting scaling; (3) The effluent from step (2) enters the microbial film control unit (2), where the colonized bacteria in the functional bacterial bed (22) inhibit biofilm formation; (4) When the conductivity of the outlet of the salt ion slow-release control unit (1) increases by more than 15% compared with the inlet, or the pressure difference ΔP of the microbial membrane control unit (2) is ≥ 0.15 MPa, the water storage and backwashing unit (3) is started for backwashing.

9. The method for coordinating multi-factor blockage control in recycled water irrigation according to claim 8, characterized in that: In step (1), the pre-exchange activation is performed by circulating a 2-10% NaCl solution for 20-40 minutes and then rinsing with pure water; the pickling treatment is performed by soaking in a 0.5-1.5% HCl solution for 5-15 minutes and then neutralizing with pure water.

10. The method for coordinating multi-factor blockage control in recycled water irrigation according to claim 8, characterized in that: In step (2), the salinity of the reclaimed water is 2000-3000 μS / cm, and the hardness ion is greater than 100 mg / L; In step (4), the backwash lasts for 5 to 10 minutes, and the backwash water is introduced into the sedimentation tank for treatment or reuse.

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