Multi-factor clogging synergistic treatment system and method for reclaimed water irrigation

Abstract

This invention relates to the field of water treatment technology, and provides a multi-factor synergistic treatment system and method for reclaimed water irrigation blockage. The multi-factor synergistic treatment system for reclaimed water irrigation includes a salt ion slow-release control unit, a microbial membrane control unit, and a water storage and backwashing unit connected in series. The salt ion slow-release control unit is layered with a quartz sand support layer, an iron oxide layer, a cation exchange resin layer, an alumina particle layer, and a coarse sand layer, inhibiting chemical scaling through ion exchange and adsorption. The microbial membrane control unit includes a functional bacterial bed layer, which colonizes non-EPS type functional bacteria to competitively inhibit biofilm formation. The water storage unit is equipped with an EC sensor and a pressure sensor to automatically trigger backwashing. This invention solves the technical problems of chemical scaling, biofilm adhesion, and physical blockage simultaneously through chemical-biological-physical multi-factor synergistic treatment, and combines closed-loop automatic control technology to reduce the frequency of manual intervention and improve operational efficiency and reliability.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a multi-factor synergistic treatment system and method for reclaimed water irrigation blockage. Background Technology

[0002] Traditional reclaimed water drip irrigation systems mainly rely on physical methods such as sand and gravel sedimentation, cyclone filtration, and mesh filter cartridges to prevent clogging. Although these methods can partially alleviate the clogging problem caused by physical particles such as silt, they lack effective means to inhibit the common chemical scaling of calcium carbonate and the formation of microbial films in reclaimed water.

[0003] This invention constructs a multi-factor synergistic treatment system and method for reclaimed water irrigation, integrating salt ion slow-release regulation, microbial film control, and water storage backwashing. This system simultaneously addresses chemical scaling, biofilm adhesion, and physical particle blockage in reclaimed water irrigation. Furthermore, real-time differential pressure and conductivity monitoring enables closed-loop automatic control, reducing the frequency of manual intervention and enhancing operational efficiency and reliability. Summary of the Invention

[0004] This invention provides a multi-factor clogging collaborative treatment system and method for reclaimed water irrigation, which solves the defects of the existing single-factor treatment architecture in dealing with multi-factor coupled clogging in high-salinity reclaimed water, lack of dynamic regulation of salt ions and active inhibition of biofilm, and low operation and maintenance efficiency due to reliance on manual backflushing.

[0005] On the one hand, the present invention provides a multi-factor clogging synergistic treatment system for reclaimed water irrigation, comprising, in series: a salt ion slow-release regulation unit, a microbial membrane control unit, and a water storage and backwashing unit;

[0006] The inlet of the salt ion slow-release control unit is connected to the reclaimed water source, and its bottom outlet is connected to the inlet of the microbial membrane control unit through a peristaltic pump.

[0007] The outlet of the microbial membrane control unit is connected to the water storage and backwashing unit via gravity flow;

[0008] The water storage and backwashing unit is connected to the backwashing inlet of the salt ion slow release control unit and the backwashing inlet of the microbial membrane control unit via a high-pressure pump.

[0009] The bottom of the salt ion slow release control unit is provided with a backwash outlet for the salt ion slow release control unit.

[0010] The bottom of the microbial film control unit is provided with a backwash outlet for the microbial film control unit.

[0011] According to the present invention, a multi-factor clogging synergistic treatment system for reclaimed water irrigation is provided, wherein the salt ion slow-release regulation unit is internally filled in layers:

[0012] From bottom to top, the layers are: a quartz sand support layer, an iron oxide layer, a cation exchange resin layer, an alumina particle layer, and a coarse sand layer.

[0013] The iron oxide layer is made of Fe3O4 or Fe2O3 particles with a particle size of 0.3~1.0 mm;

[0014] The cation exchange resin layer is filled with porous acrylic or methacrylic resin;

[0015] The alumina particle layer has a specific surface area >150m². 2 / g, pseudoboehmite particles with a particle size of 1.5~3.0mm.

[0016] According to the present invention, a multi-factor clogging synergistic treatment system for reclaimed water irrigation is provided, wherein the coarse sand layer contains two layers of non-woven fabric yarn, the particle size of the coarse sand is 1.0~2.5mm, and the height of the coarse sand layer is 15~20cm.

[0017] The salt ion slow-release control unit is equipped with a low-speed flow guide baffle.

[0018] According to the present invention, a multi-factor clogging synergistic treatment system for reclaimed water irrigation is provided, wherein the microbial membrane control unit is internally filled in layers:

[0019] From bottom to top, the layers are: a quartz sand layer, a functional bacterial bed layer, and a ceramsite layer.

[0020] The functional bacterial bed is composed of modified biochar and three-dimensional filler with a particle size of 8-20 mm, and is colonized with non-EPS type functional bacteria.

[0021] According to the present invention, a multi-factor blockage synergistic treatment system for reclaimed water irrigation is provided, wherein a first EC sensor is provided at the inlet of the salt ion slow release regulation unit;

[0022] A second EC sensor is installed at the outlet of the salt ion slow-release control unit.

[0023] According to the present invention, a multi-factor clogging synergistic treatment system for reclaimed water irrigation is provided, wherein a first pressure sensor is provided at the inlet of the microbial membrane control unit;

[0024] A second pressure sensor is installed at the outlet of the microbial membrane control unit.

[0025] According to the present invention, a multi-factor clogging synergistic treatment system for reclaimed water irrigation is provided, wherein the water storage and backwashing unit is equipped with a control unit that automatically triggers backwashing when any of the following conditions are met:

[0026] (a) The outlet conductivity of the salt ion slow-release control unit increases by more than 15% compared to the inlet conductivity;

[0027] (b) The pressure difference between the inlet and outlet of the microbial membrane control unit ΔP ≥ 0.15 MPa.

[0028] On the other hand, the present invention also provides a method for the synergistic treatment of multi-factor blockage in reclaimed water irrigation, comprising the following steps:

[0029] (1) Pre-exchange activation of the cation exchange resin of the salt ion slow release regulation unit, acid washing treatment of iron oxide particles, and pre-culture of functional bacteria in the packing material of the functional bacterial bed for 5-15 days.

[0030] (2) The reclaimed 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.

[0031] (3) The effluent from step (2) enters the microbial film control unit, where the colonization of the functional bacterial bed inhibits biofilm formation;

[0032] (4) When the outlet conductivity of the salt ion slow release control unit increases by more than 15% compared to the inlet, or the pressure difference ΔP of the microbial membrane control unit is greater than or equal to 0.15 MPa, the water storage and backwashing unit is started for backwashing.

[0033] According to the present invention, a multi-factor synergistic treatment method for reclaimed water irrigation is provided. In step (1), the pre-exchange activation is performed by circulating 2-10% NaCl solution for 20-40 minutes and then rinsing with pure water; the acid washing treatment is performed by soaking in 0.5-1.5% HCl for 5-15 minutes and then neutralizing with pure water.

[0034] According to the present invention, a multi-factor synergistic treatment method for reclaimed water irrigation is provided, in step (2), the salinity of the reclaimed water influent is 2000-3000 μS / cm, and the hardness ion content is >100 mg / L;

[0035] 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.

[0036] The multi-factor clogging synergistic treatment system and method for reclaimed water irrigation provided by this invention has the following advantages compared with the prior art:

[0037] (1) The multi-factor clogging synergistic treatment system and method for reclaimed water irrigation provided by the present invention simultaneously removes hardness ions and inhibits chemical scaling through a salt ion slow-release control unit, competitively inhibits biofilm formation through a microbial film control unit, and intelligently triggers backwashing to solve physical clogging through a water storage and backwashing unit. This solves multiple clogging problems such as chemical scaling, biofilm adhesion, and physical particle clogging in reclaimed water irrigation, realizes multi-factor synergistic treatment, and significantly improves the comprehensive anti-clogging capability.

[0038] (2) The multi-factor blockage collaborative treatment system and method for reclaimed water irrigation provided by the present invention monitors the change in conductivity 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 inspection and low operation and maintenance efficiency in traditional treatment methods, realizes intelligent closed-loop control, and greatly improves operation and maintenance efficiency.

[0039] (3) The multi-factor blockage synergistic treatment system and method for reclaimed water irrigation provided by the present invention, wherein the cation exchange resin layer can be acid washed and regenerated, and the iron oxide layer can be restored to activity by HCl soaking, which solves the problems of easy loss of functional materials and high long-term operating costs, realizes the efficient reuse of functional materials, and reduces long-term operating costs.

[0040] (4) The multi-factor blockage synergistic 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 by optimizing the particle size gradient of the layered packing material of the salt ion unit, replacing the packing material type of the functional bacterial bed layer of the microbial unit, and designing the backwash water path independently. It realizes the modular structure to adapt to complex water quality and enhances scalability.

[0041] (5) The multi-factor blockage synergistic treatment system and method for reclaimed 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 reducing the need for functional microbial community inhibitory agent addition, thereby achieving efficient utilization of water resources and improving environmental compatibility. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the multi-factor clogging synergistic treatment system for reclaimed water irrigation provided in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the salt ion slow-release regulation unit provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the microbial membrane control unit provided in an embodiment of the present invention.

[0046] Figure label:

[0047] 1. Salt ion slow-release control unit; 2. Microbial membrane control unit; 3. Water storage and backwashing unit; 4. Peristaltic pump; 5. High-pressure pump; 11. Quartz sand support layer; 12. Iron oxide layer; 13. Cation exchange resin layer; 14. Alumina particle layer; 15. Coarse sand layer; 16. Non-woven fabric; 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. Backwashing inlet of salt ion slow-release control unit; 32. Backwashing inlet of microbial membrane control unit; 33. Backwashing outlet of salt ion slow-release control unit; 34. Backwashing outlet of microbial membrane control unit. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] The following is combined with Figures 1-3 This invention describes a multi-factor synergistic treatment system and method for reclaimed water irrigation blockage.

[0050] Figure 1 This is a schematic diagram of the multi-factor blockage synergistic treatment system for reclaimed water irrigation provided in an embodiment of the present invention.

[0051] like Figure 1 As shown in the embodiment of the present invention, the multi-factor clogging synergistic treatment system for reclaimed water irrigation includes, in series, a salt ion slow-release control unit 1, a microbial membrane control unit 2, and a water storage and backwashing unit 3. The inlet of the salt ion slow-release control unit 1 is connected to a reclaimed water source, and its bottom outlet is connected to the inlet of the microbial membrane control unit 2 via a peristaltic pump 4. The outlet of the microbial membrane control unit 2 is connected to the water storage and backwashing unit 3 via gravity flow. The water storage and backwashing unit 3 is connected to the backwashing inlet 31 of the salt ion slow-release control unit and the backwashing inlet 32 ​​of the microbial membrane control unit via a high-pressure pump 5. The bottom of the salt ion slow-release control unit 1 is provided with a salt ion slow-release control unit backwashing outlet 33. The bottom of the microbial membrane control unit 2 is provided with a microbial membrane control unit backwashing outlet 34.

[0052] Figure 2 This is a schematic diagram of the structure of the salt ion slow-release regulation unit provided in an embodiment of the present invention.

[0053] like Figure 2As shown in the embodiment of the present invention, the multi-factor blockage synergistic treatment system for reclaimed water irrigation provided in this embodiment of the invention comprises a salt ion slow-release control unit 1 internally filled with layers: from bottom to top, a quartz sand support layer 11, an iron oxide layer 12, a cation exchange resin layer 13, an alumina particle layer 14, and a coarse sand layer 15; the coarse sand layer 15 contains two layers of non-woven fabric yarn 16; the salt ion slow-release control unit 1 is equipped with a low-speed flow guide baffle 17; the inlet of the salt ion slow-release control unit 1 is equipped with a first EC sensor 18; and the outlet of the salt ion slow-release control unit 1 is equipped with a second EC sensor 19.

[0054] Figure 3 This is a schematic diagram of the structure of the microbial membrane control unit provided in an embodiment of the present invention.

[0055] like Figure 3 As shown in the embodiment of the present invention, the reclaimed water irrigation multi-factor blockage synergistic treatment system has the following internal layer filling of the microbial membrane control unit 2: from bottom to top, it consists of a quartz sand layer 21, a functional bacterial bed layer 22, and a ceramic particle layer 23; the inlet of the microbial membrane control unit 2 is equipped with a first pressure sensor 24; and the outlet of the microbial membrane control unit 2 is equipped with a second pressure sensor 25.

[0056] In this 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.

[0057] In this invention, the cation exchange resin layer 13 is filled with a porous resin of acrylic or methacrylic acid, and the alumina particle layer 14 has a specific surface area >150 m². 2 / g, pseudoboehmite particles with a particle size of 1.5~3.0mm.

[0058] In this invention, the particle size of the coarse sand in the coarse sand layer is 1.0~2.5mm, preferably 1.3~2.2mm, and more preferably 1.6~1.8mm; the height of the coarse sand layer is 15~20cm, preferably 16~19cm, and more preferably 17~18cm.

[0059] In this invention, the functional bacterial bed 22 is composed of modified biochar and three-dimensional filler, with a particle size of 8-20 mm, preferably 11-17 mm, and more preferably 13-15 mm, and is colonized with non-EPS type functional bacteria.

[0060] In this invention, the water storage and backwashing unit 3 is equipped with a control unit that automatically triggers backwashing when any of the following conditions are met: (a) the outlet conductivity of the salt ion slow release control unit 1 increases by more than 15% compared to the inlet; (b) the inlet and outlet pressure difference ΔP of the microbial film control unit 2 is ≥0.15MPa.

[0061] On the other hand, the present invention also provides a method for the synergistic treatment of multi-factor blockage in reclaimed water irrigation, comprising the following steps:

[0062] (1) The cation exchange resin of the salt ion slow release regulation unit 1 is pre-exchanged and activated, the iron oxide particles are acid washed, and the functional bacteria in the packing material of the functional bacterial bed 22 are pre-cultured for 5 to 15 days, preferably 7 to 10 days, and more preferably 8 to 9 days.

[0063] (2) The reclaimed 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.

[0064] (3) In step (2), the effluent enters the microbial film control unit 2, where the colonization of the functional bacterial bed 22 inhibits biofilm formation.

[0065] (4) When the outlet conductivity of the salt ion slow release control unit 1 increases by more than 15% compared to the inlet, or the pressure difference ΔP of the microbial membrane control unit 2 is greater than or equal to 0.15 MPa, the water storage and backwashing unit 3 is started for backwashing.

[0066] In step (1) of the present invention, the pre-exchange activation is performed by circulating 2-10% NaCl solution for 20-40 minutes and then rinsing with pure water, preferably for 4-8% and 25-35 minutes, and more preferably for 5-6% and 28-32 minutes, respectively; the acid washing treatment is performed by soaking in 0.5-1.5% HCl for 5-15 minutes and then neutralizing with pure water, preferably for 0.8-1.2% and 8-12 minutes, respectively.

[0067] In step (2) of this invention, the salt content of the reclaimed water inlet is 2000-3000 μS / cm, and the hardness ion content is >100 mg / L.

[0068] In step (4) of this invention, backwashing lasts for 5 to 10 minutes, and the backwash water is introduced into a sedimentation tank for treatment or reuse.

[0069] Example

[0070] The water quality improvement effect of the multi-factor blockage synergistic treatment system for reclaimed water irrigation provided in this application is shown in Table 1 below.

[0071] Table 1. Improvement effect on effluent water quality

[0072]

[0073] The anti-clogging effects of the multi-factor clogging synergistic treatment system for reclaimed water irrigation provided in this application on water treatment and untreated systems are shown in Table 2 below.

[0074] Table 2 Anti-clogging effect

[0075]

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-factor synergistic clogging control system for reclaimed water irrigation, characterized in that, It includes a series-connected salt ion slow-release control unit (1), a microbial membrane control unit (2), and a water storage and backwashing unit (3). The inlet of the salt ion slow release control unit (1) is connected to the regenerated water source, and its bottom outlet is connected to the inlet of the microbial membrane control unit (2) through a peristaltic pump (4). The outlet of the microbial membrane control unit (2) is connected to the water storage and backwashing unit (3) by gravity flow. The water storage and backwashing unit (3) is connected to the backwashing inlet (31) of the salt ion slow release control unit and the backwashing inlet (32) of the microbial membrane control unit via a high-pressure pump (5). The bottom of the salt ion slow release control unit (1) is provided with a salt ion slow release control unit backwash outlet (33). The bottom of the microbial film control unit (2) is provided with a backwash outlet (34) for the microbial film control unit. The salt ion slow-release regulation unit (1) is internally layered and filled with: From bottom to top, the layers are: quartz sand support layer (11), iron oxide layer (12), cation exchange resin layer (13), alumina particle layer (14), and 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 or methacrylic porous resin. The alumina particle layer (14) has a specific surface area >150m². 2 / g, pseudoboehmite particles with a particle size of 1.5~3.0mm; The microbial membrane control unit (2) is internally layered and filled: From bottom to top, the layers are: quartz sand layer (21), functional bacterial bed layer (22), and ceramsite layer (23). The functional bacterial bed (22) is composed of modified biochar and three-dimensional filler, with a particle size of 8~20mm, and is colonized with non-EPS type functional bacteria. The water storage and backwashing unit (3) is equipped with a control unit that automatically triggers backwashing when any of the following conditions are met: (a) Salt ion slow-release control unit (1) The outlet conductivity increases by more than 15% compared to the inlet conductivity; (b) Microbial membrane control unit (2) Inlet and outlet pressure difference ΔP ≥ 0.15 MPa.

2. The multi-factor clogging synergistic treatment system for reclaimed water irrigation according to claim 1, characterized in that, The coarse sand layer (15) contains two layers of non-woven fabric yarn (16), the particle size of the coarse sand is 1.0~2.5mm, and the height of the coarse sand layer (15) is 15~20cm. The salt ion slow-release control unit (1) is equipped with a low-speed flow guide baffle (17).

3. The multi-factor clogging synergistic treatment system for reclaimed water irrigation according to claim 1, characterized in that, The inlet of the salt ion slow release control unit (1) is equipped with a first EC sensor (18). The outlet of the salt ion slow release control unit (1) is equipped with a second EC sensor (19).

4. The multi-factor clogging synergistic treatment system for reclaimed water irrigation according to claim 1, characterized in that, The inlet of the microbial film control unit (2) is equipped with a first pressure sensor (24). The outlet of the microbial film control unit (2) is equipped with a second pressure sensor (25).

5. A method for synergistic treatment of multi-factor blockage in reclaimed water irrigation, employing the system described in any one of claims 1-4, characterized in that, Includes the following steps: (1) The cation exchange resin of the salt ion slow release regulation unit (1) is pre-exchanged and activated, the iron oxide particles are acid washed, and the functional bacteria in the packing material of the functional bacterial bed (22) are pre-cultured for 5-15 days. (2) The reclaimed water enters the salt ion slow release control unit (1) and flows through the coarse sand layer (15), alumina particle layer (14), cation exchange resin layer (13) and iron oxide layer (12) in sequence to remove hardness ions and inhibit scaling. (3) In step (2), the effluent enters the microbial film control unit (2) and inhibits biofilm formation through the colonization of the functional bacterial bed layer (22); (4) When the outlet conductivity of the salt ion slow release control unit (1) increases by more than 15% compared to the inlet, or the pressure difference ΔP of the microbial membrane control unit (2) is greater than 0.15 MPa, the water storage and backwashing unit (3) is started for backwashing.

6. The method for synergistic treatment of multi-factor blockage in reclaimed water irrigation according to claim 5, characterized in that, In step (1), the pre-exchange activation is performed by circulating 2-10% NaCl solution for 20-40 minutes and then rinsing with pure water; the acid washing treatment is performed by soaking in 0.5-1.5% HCl for 5-15 minutes and then neutralizing with pure water.

7. The method for synergistic treatment of multi-factor blockage in reclaimed water irrigation according to claim 5, characterized in that, In step (2), the salt content of the reclaimed water inlet is 2000-3000 μS / cm and the hardness ion content is >100 mg / L; in step (4), the backwashing lasts for 5-10 minutes and the backwash water is introduced into the sedimentation tank for treatment or reuse.

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