Biological regeneration method of water treatment organic matter adsorption material

Abstract

The invention relates to the technical field of water treatment, in particular to a biological regeneration method of a water treatment organic matter adsorption material, which comprises the following steps: S1, screening and domesticating microbial populations, namely selecting dominant strains of pseudomonas, actinomycetes and bacillus, domesticating microorganisms under laboratory conditions to enable the microorganisms to adapt to the surface environment of the adsorption material, and performing biological regeneration on the adsorption material; organic matters which are efficiently decomposed and adsorbed are provided; s2, an adsorption material regeneration process, including pretreatment of an adsorption saturated material, microbial population cultivation by using a biodegradation pool, further aeration of the biodegradation pool and addition of nutrient substances, sufficient oxygen supply to microorganisms, degradation monitoring and regeneration of organic matters, and flushing of the adsorption material for repeated recycling. The adsorption material is regenerated through a biotechnology, adsorbed organic pollutants are effectively removed, the service life of the adsorption material is prolonged, and it is ensured that the treatment process is environmentally friendly and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a biological regeneration method for water treatment organic matter adsorption material. Background Art

[0002] The biological regeneration method of organic adsorption materials is a process that utilizes the metabolism of microorganisms to degrade or convert organic pollutants adsorbed on the materials into harmless substances. This method can not only restore the adsorption capacity of the adsorption materials, but also reduce environmental pollution;

[0003] The invention with announcement number CN115159613B specifically discloses a method for in-situ regeneration of solid waste biomass carbon-based materials for adsorption and treatment of organic pollutants, specifically: adding the biomass carbon-based materials to a water body containing organic pollution, after a certain period of adsorption and enrichment, moving them into a water body containing a regeneration agent and (or) a light source for regeneration reaction, and the wet-regenerated biochar-based materials can be used for repeated adsorption of organic pollutants. Compared with conventional pyrolysis regeneration methods, the in-situ regeneration of solid waste biomass carbon-based materials for adsorption and treatment of organic pollution of the present invention can effectively avoid high-temperature energy consumption, avoid high-temperature damage to the structural properties of carbon-based materials, and simplify the regeneration process;

[0004] At present, the regeneration methods of organic adsorption materials (such as activated carbon, adsorption resin, graphene-based materials, etc.) commonly used in water treatment are mainly physical and chemical methods. These technologies have the following disadvantages:

[0005] High energy consumption: Physical regeneration methods usually require high temperatures (such as thermal regeneration), resulting in high energy consumption.

[0006] Chemical pollution: Chemical solvent regeneration may cause secondary pollution, increasing the complexity of treatment.

[0007] High material loss: High temperatures and highly corrosive solvents can cause structural damage to the adsorption material, thus reducing its service life.

[0008] Therefore, a biological regeneration method for organic adsorption material for water treatment is proposed. Summary of the invention

[0009] The purpose of the present invention is to provide a biological regeneration method for water treatment organic adsorption materials, which regenerates the adsorption materials through biotechnology, effectively removes adsorbed organic pollutants, prolongs the service life of the adsorption materials, and ensures that the treatment process is environmentally friendly and efficient. This scheme will be different from traditional physical and chemical regeneration technologies, such as high-temperature pyrolysis, chemical solvent elution, etc., and focuses on using the decomposition and metabolism ability of microorganisms on organic matter to achieve material regeneration, and uses specific microbial populations to degrade organic matter in the adsorption material to achieve regeneration of the adsorption material. This method can not only reduce energy consumption, but also reduce damage to the adsorption material and avoid secondary pollution, so as to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above object, the present invention provides the following technical solution: a biological regeneration method for water treatment organic adsorption material, comprising the following steps:

[0011] S1. Screening and domestication of microbial populations: selecting dominant species of Pseudomonas, Actinomycetes and Bacillus, and domesticating the microorganisms under laboratory conditions to adapt them to the surface environment of the adsorption material and provide efficient decomposition of adsorbed organic matter;

[0012] S2. Adsorption material regeneration process, including pretreatment of adsorption saturated materials, cultivation of microbial population in biodegradation tanks, further aeration of biodegradation tanks and addition of nutrients to provide microorganisms with sufficient oxygen supply, followed by monitoring and regeneration of organic matter degradation, and then flushing the adsorption material for repeated recycling.

[0013] Preferably, the pretreatment step includes removing the adsorption saturated material, such as activated carbon, from the water treatment system and simply rinsing it with clean water to remove loose particles and soluble substances on the surface. The biodegradation tank step includes placing the pretreated adsorption material in a biological regeneration tank, adding a cultured dominant microbial population, and maintaining the activity of the microorganisms by controlling the temperature range at 25°C-35°C and the pH range at 6.5-7.5.

[0014] Preferably, the regeneration pool is intermittently aerated regularly in the aeration and nutrient addition step to ensure oxygen supply to the microorganisms and promote the degradation of organic matter. According to the metabolic needs of the microorganisms, nitrogen and phosphorus sources, such as ammonium nitrate and phosphate, are added in appropriate amounts to accelerate the degradation of organic matter by the microorganisms.

[0015] Preferably, in the organic matter degradation monitoring step, the progress of the regeneration process is judged by online monitoring of changes in organic matter concentration, such as COD and TOC, with the goal of reducing COD or TOC to below a set threshold value, with a removal rate of ≥95%. When the organic matter concentration drops to a set low threshold value, it indicates that the material regeneration is complete, and the adsorption material is cleaned and reused. After the regeneration is completed, the adsorption material is taken out and rinsed with clean water to remove by-products produced by microbial metabolism. The regenerated adsorption material can be put back into the water treatment system for continued use.

[0016] Preferably, after regeneration is completed, the adsorbent material is subjected to a performance test to detect its adsorption capacity after regeneration, such as specific surface area and pore structure. The specific surface area is tested using a nitrogen adsorption method, and the pore structure is evaluated using a BET method to ensure that the material performance is restored to more than 90% of its initial state.

[0017] Preferably, the efficiency of microbial degradation is evaluated by monitoring the organic matter removal rate during the regeneration process of the adsorption material. The key indicators include the reduction of chemical oxygen demand COD and total organic carbon TOC. The organic matter removal rate is calculated by the formula:

[0018]

[0019] Where: C inlet : The concentration of organic matter on the adsorption material before regeneration; C outlet : Concentration of organic matter after regeneration.

[0020] Preferably, the recovery of the adsorption capacity is evaluated by the degree of recovery of the specific surface area S and the pore volume V of the adsorbent material before and after regeneration;

[0021] Adsorption performance recovery formula:

[0022]

[0023] Where: S initial : specific surface area of ​​adsorption material before regeneration; S recovered : Specific surface area of ​​the adsorbent material after regeneration.

[0024] Preferably, the growth and activity of microorganisms are monitored, and the degradation capacity of microorganisms is determined by using indicators such as biochemical oxygen demand (BOD) and carbon dioxide produced by microbial metabolism;

[0025] Microbial degradation rate calculation formula:

[0026]

[0027] Where: M CO2 : CO generated during microbial metabolism 2 Quality; M organic : The mass of initial organic matter.

[0028] Preferably, to ensure the high efficiency of the microbial degradation process, an online monitoring system is introduced to continuously monitor the key parameters of COD, TOC, BOD, temperature, pH, and dissolved oxygen (DO);

[0029] Data monitoring formula:

[0030] C time =C 0 ·e -λt

[0031] Where: C time : The concentration of organic matter at time t; C 0 : initial organic matter concentration; λ: rate constant of organic matter degradation.

[0032] Preferably, the organic matter degradation curve is fitted in real time through a kinetic model, the microbial degradation process is optimized, and the organic matter degradation rate is evaluated using zero-order degradation kinetics or first-order degradation kinetics;

[0033] First-order kinetic model formula:

[0034]

[0035] Where K is the degradation rate constant, C is the organic matter concentration, and t is the degradation time.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] Alternative to physical and chemical regeneration: This method is different from traditional high-temperature regeneration (pyrolysis) or chemical solvent regeneration, reducing high energy consumption and secondary pollution.

[0038] Efficient degradation by microorganisms: Utilizing the metabolic capacity of specific microbial communities, organic matter can be degraded under mild conditions (normal temperature and pressure) without the need for violent chemical reactions or high-temperature treatment.

[0039] Structural protection of adsorption materials: The biological regeneration method avoids the destruction of the adsorption material structure by high temperature or strong acid and alkali conditions, thus extending the service life of the material.

[0040] High efficiency and low consumption: Regeneration is completed under normal temperature and pressure conditions, and energy consumption is significantly reduced.

[0041] Extended material service life: Compared with chemical and physical regeneration, microbial treatment can better protect the pore structure of the adsorption material and maintain the adsorption performance of the material.

[0042] Environmentally friendly and pollution-free: No chemical solvents are required during the regeneration process, which avoids secondary pollution and makes the entire process green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A diagram showing the steps of the biological regeneration method of the water treatment organic matter adsorption material of the present invention;

[0045] Figure 2 is a process flow chart of the adsorption material regeneration process of the present invention;

[0046] Figure 3 It is a monitoring data table of COD removal rate of the present invention;

[0047] Figure 4 A data table is recovered for the specific surface area of ​​the adsorption material of the present invention;

[0048] Figure 5 This is a data table of microbial metabolism and degradation efficiency of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figures 1 to 5 , the present invention provides a technical solution:

[0051] A biological regeneration method for water treatment organic adsorption material comprises the following steps:

[0052] S1. Screening and domestication of microbial populations: selecting dominant species of Pseudomonas, Actinomycetes and Bacillus, and domesticating the microorganisms under laboratory conditions to adapt them to the surface environment of the adsorption material and provide efficient decomposition of adsorbed organic matter;

[0053] S2. Adsorption material regeneration process, including pretreatment of adsorption saturated materials, cultivation of microbial population in biodegradation tanks, further aeration of biodegradation tanks and addition of nutrients to provide microorganisms with sufficient oxygen supply, followed by monitoring and regeneration of organic matter degradation, and then flushing the adsorption material for repeated recycling.

[0054] The pretreatment step includes removing the adsorption saturated material, such as activated carbon, from the water treatment system and performing a simple clean water rinse to remove loose particles and soluble substances on the surface. The biodegradation tank step includes placing the pretreated adsorption material in a biological regeneration tank, adding cultured dominant microbial populations, and maintaining microbial activity by controlling the temperature range at 25°C-35°C and the pH range at 6.5-7.5.

[0055] In the aeration and nutrient addition step, the regeneration pool is intermittently aerated regularly to ensure the oxygen supply of the microorganisms and promote the degradation of organic matter. According to the metabolic needs of the microorganisms, nitrogen sources and phosphorus sources, such as ammonium nitrate and phosphate, are added in appropriate amounts to accelerate the degradation of organic matter by the microorganisms.

[0056] In the organic matter degradation monitoring step, the progress of the regeneration process is judged by online monitoring of changes in organic matter concentration, such as COD and TOC. The goal is to reduce COD or TOC to below a set threshold, with a removal rate of ≥95%. When the organic matter concentration drops to a set low threshold, it indicates that the material regeneration is complete, and the adsorption material is cleaned and reused. After the regeneration is completed, the adsorption material is taken out and rinsed with clean water to remove by-products produced by microbial metabolism. The regenerated adsorption material can be put back into the water treatment system for continued use.

[0057] After regeneration is completed, the adsorption material is tested for its adsorption capacity after regeneration, such as specific surface area and pore structure. The nitrogen adsorption method is used to test the specific surface area, and the BET method is used to evaluate the pore structure to ensure that the material performance is restored to more than 90% of the initial state.

[0058] The efficiency of microbial degradation is evaluated by monitoring the organic matter removal rate during the regeneration process of the adsorption material. The key indicators include the reduction of chemical oxygen demand (COD) and total organic carbon (TOC). The organic matter removal rate is calculated using the formula:

[0059]

[0060] Where: C inlet : The concentration of organic matter on the adsorption material before regeneration; C outlet : Concentration of organic matter after regeneration.

[0061] The recovery of adsorption capacity was evaluated by the recovery degree of specific surface area S and pore volume V of the adsorbent material before and after regeneration;

[0062] Adsorption performance recovery formula:

[0063]

[0064] Where: S initial : specific surface area of ​​adsorption material before regeneration; S recovered: Specific surface area of ​​the adsorbent material after regeneration.

[0065] Monitor the growth and activity of microorganisms, and use indicators such as biochemical oxygen demand (BOD) and carbon dioxide produced by microbial metabolism to determine the degradation capacity of microorganisms;

[0066] Microbial degradation rate calculation formula:

[0067]

[0068] Where: M CO2 : CO generated during microbial metabolism 2 Quality; M organic : The mass of initial organic matter.

[0069] To ensure the high efficiency of the microbial degradation process, an online monitoring system is introduced to continuously monitor key parameters such as COD, TOC, BOD, temperature, pH, and dissolved oxygen (DO);

[0070] Data monitoring formula:

[0071] C time =C 0 ·e -λt

[0072] Where: C time : The concentration of organic matter at time t; C 0 : initial organic matter concentration; λ: rate constant of organic matter degradation.

[0073] Through the kinetic model, the organic matter degradation curve is fitted in real time, the microbial degradation process is optimized, and the organic matter degradation rate is evaluated using zero-order degradation kinetics or first-order degradation kinetics;

[0074] First-order kinetic model formula:

[0075]

[0076] Where K is the degradation rate constant, C is the organic matter concentration, and t is the degradation time.

[0077] In the process of organic matter degradation, assuming that the degradation reaction is a first-order reaction, the degradation rate constant k is related to factors such as temperature, dissolved oxygen, and microbial activity, and can be expressed by the following formula:

[0078] First-order reaction kinetics formula:

[0079]

[0080] Solve for the concentration versus time:

[0081] C(t)=C 0 e-kt

[0082] By monitoring C(t) at different time points, the degradation rate constant k can be fitted.

[0083] Adsorption material performance recovery model:

[0084] The performance recovery of the adsorbent material after regeneration can be evaluated by the recovery rate of specific surface area and pore volume using the following formula:

[0085] Specific surface area recovery formula:

[0086]

[0087] Among them, S after is the specific surface area after regeneration, S before is the specific surface area before regeneration.

[0088] Relationship between microbial degradation capacity and nutrient supply:

[0089] The microbial degradation efficiency is proportional to the concentration of nutrients (such as nitrogen source and phosphorus source). By adding nutrients of different concentrations, the degradation rate k of microorganisms will change. It can be described by the following model:

[0090] Relationship between degradation rate and nutrients:

[0091] k=k 0 ·(1+α·N)

[0092] Where: k 0 is the initial degradation rate constant; N is the nutrient concentration; α is the rate constant associated with the nutrient.

[0093] 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biological regeneration method for water treatment organic adsorption material, characterized in that: The steps include: S1. Screening and domestication of microbial populations: selecting dominant species of Pseudomonas, Actinomycetes and Bacillus, and domesticating the microorganisms under laboratory conditions to adapt them to the surface environment of the adsorption material and provide efficient decomposition of adsorbed organic matter; S2. Adsorption material regeneration process, including pretreatment of adsorption saturated materials, cultivation of microbial populations in biodegradation tanks, further aeration of the biodegradation tanks and addition of nutrients to provide microorganisms with sufficient oxygen supply, followed by monitoring and regeneration of organic matter degradation, and then flushing the adsorption material for repeated recycling.

2. The biological regeneration method of a water treatment organic adsorption material according to claim 1, characterized in that: The pretreatment step includes removing the adsorption saturated material, such as activated carbon, from the water treatment system and performing a simple clean water rinse to remove loose particles and soluble substances on the surface. The biodegradation tank step includes placing the pretreated adsorption material in a biological regeneration tank, adding cultured dominant microbial populations, and maintaining microbial activity by controlling the temperature range at 25°C-35°C and the pH range at 6.5-7.

5.

3. The biological regeneration method of a water treatment organic adsorption material according to claim 2, characterized in that: In the aeration and nutrient addition step, the regeneration pool is intermittently aerated regularly to ensure the oxygen supply of the microorganisms and promote the degradation of organic matter. According to the metabolic needs of the microorganisms, nitrogen sources and phosphorus sources, such as ammonium nitrate and phosphate, are added in appropriate amounts to accelerate the degradation of organic matter by the microorganisms.

4. The biological regeneration method of a water treatment organic adsorption material according to claim 3, characterized in that: In the organic matter degradation monitoring step, the progress of the regeneration process is judged by online monitoring of changes in organic matter concentration, such as COD and TOC. The goal is to reduce COD or TOC to below a set threshold, with a removal rate of ≥95%. When the organic matter concentration drops to a set low threshold, it indicates that the material regeneration is complete, and the adsorption material is cleaned and reused. After the regeneration is completed, the adsorption material is taken out and rinsed with clean water to remove by-products produced by microbial metabolism. The regenerated adsorption material can be put back into the water treatment system for continued use.

5. The biological regeneration method of a water treatment organic adsorption material according to claim 4, characterized in that: After regeneration is completed, the adsorption material is tested for its adsorption capacity after regeneration, such as specific surface area and pore structure. The nitrogen adsorption method is used to test the specific surface area, and the BET method is used to evaluate the pore structure to ensure that the material performance is restored to more than 90% of the initial state.

6. The biological regeneration method of a water treatment organic adsorption material according to claim 5, characterized in that: The efficiency of microbial degradation is evaluated by monitoring the organic matter removal rate during the regeneration process of the adsorption material. The key indicators include the reduction of chemical oxygen demand (COD) and total organic carbon (TOC). The organic matter removal rate is calculated using the formula: Where: C inlet : The concentration of organic matter on the adsorption material before regeneration; C outlet : Concentration of organic matter after regeneration.

7. The biological regeneration method of a water treatment organic adsorption material according to claim 6, characterized in that: The recovery of adsorption capacity was evaluated by the recovery degree of specific surface area S and pore volume V of the adsorbent material before and after regeneration; Adsorption performance recovery formula: Where: S initial : specific surface area of ​​adsorption material before regeneration; S recovered : Specific surface area of ​​the adsorbent material after regeneration.

8. The biological regeneration method of a water treatment organic adsorption material according to claim 7, characterized in that: Monitor the growth and activity of microorganisms, and use indicators such as biochemical oxygen demand (BOD) and carbon dioxide produced by microbial metabolism to determine the degradation capacity of microorganisms; Microbial degradation rate calculation formula: Where: M CO2 : The mass of CO2 generated during microbial metabolism; M organic : The mass of initial organic matter.

9. The biological regeneration method of a water treatment organic adsorption material according to claim 8, characterized in that: To ensure the high efficiency of the microbial degradation process, an online monitoring system is introduced to continuously monitor key parameters such as COD, TOC, BOD, temperature, pH, and dissolved oxygen (DO); Data monitoring formula: C time =C0·e -λt Where: C time : The concentration of organic matter at time t; C0: Initial organic matter concentration; λ: Rate constant of organic matter degradation.

10. The biological regeneration method of a water treatment organic adsorption material according to claim 9, characterized in that: Through the kinetic model, the organic matter degradation curve is fitted in real time, the microbial degradation process is optimized, and the organic matter degradation rate is evaluated using zero-order degradation kinetics or first-order degradation kinetics; First-order kinetic model formula: Where K is the degradation rate constant, C is the organic matter concentration, and t is the degradation time.

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