A sludge conditioner supported on nanoscale hydrophobic materials and polynuclear metal chelates and its preparation method

Abstract

This invention discloses a sludge conditioner comprising a nanoscale hydrophobic material loaded with a polynuclear metal chelate. The conditioner, by weight percentage, comprises the following components: 10-20% hydrophobic material, 30-35% chelated iron solution, 10-15% polynuclear metal salt, 5-10% dispersant, 2-5% pH adjuster, and the balance being deionized water. This sludge conditioner can disrupt the EPS (expanded saline solution) of the sludge system, dissolve microbial cells in the sludge, release bound water within the sludge, reduce electrostatic repulsion, improve the hydrophobicity of microbial cells in the sludge, and release free water and surface water, thereby significantly improving the dewatering performance of the sludge.

Description

Technical Field

[0001] This invention belongs to the field of sludge conditioning and dewatering technology. Specifically, it relates to a sludge conditioner with nanoscale hydrophobic material loaded with polynuclear metal chelates and its preparation method. Background Technology

[0002] In the domestic market for sludge dewatering agents, with the gradual improvement of urban sewage treatment infrastructure, the urban sewage treatment industry has developed rapidly, and significant results have been achieved in water environment management.

[0003] Sludge dewatering pretreatment is an indispensable step in wastewater / sludge treatment. Currently, commercially available sludge dewatering agents generally use a combination of iron and aluminum salts with organic flocculants such as PAM or lime. However, these agents typically suffer from poor dewatering performance, high dosage, large sludge volume increases, and high costs. Therefore, there is an urgent need for a highly efficient and environmentally friendly sludge dewatering agent to address these industry pain points. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems existing in the prior art and provide a sludge conditioner composed of nanoscale hydrophobic materials loaded with polynuclear metal chelates and its preparation method. This invention applies a technical solution of combining a hydrophobic material-loaded coordinated iron chelating agent with a polynuclear metal catalyst and a biodegradable polymeric organic base in a sludge dewatering process. This achieves the following effects: disrupting the EPS (expanded saline solution) of the sludge system, dissolving microbial cells in the sludge, releasing bound water within the sludge, reducing electrostatic repulsion, improving the hydrophobicity of microbial cells in the sludge, and releasing free water and surface water, thus greatly improving the dewatering performance of the sludge. It also effectively slows down the corrosion rate of pipes and equipment and significantly reduces the amount of sludge added.

[0005] The objective of this invention and the technical problem it solves are achieved by the following technical solutions.

[0006] The first aspect of the present invention provides a sludge conditioner of nanoscale hydrophobic material loaded with polynuclear metal chelates, wherein the sludge conditioner comprises, by weight percentage, the following components: 10-20% hydrophobic material, 30-35% chelated iron solution, 10-15% polynuclear metal salt, 5%-10% dispersant, 2-5% pH adjuster, and the balance being deionized water.

[0007] In a preferred embodiment of the present invention, the hydrophobic material is selected from one or a mixture of two or more of bentonite, attapulgite, diatomaceous earth, montmorillonite, and zeolite powder.

[0008] In a preferred embodiment of the present invention, the chelated iron solution is a mixture of a chelating agent and an iron salt in a molar ratio of 2:1 to 5:1.

[0009] In a preferred embodiment of the present invention, the chelating agent is selected from any one or a mixture of two or more of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetic acid, ethylenediaminedisuccinic acid, and citric acid.

[0010] In a preferred embodiment of the present invention, the iron salt is ferric sulfate and / or ferrous sulfate; when the iron salt is ferric sulfate and ferrous sulfate, the molar ratio of ferric sulfate and ferrous sulfate is 5:5 to 7:3.

[0011] In a preferred embodiment of the present invention, the polynuclear metal salt is selected from one or a mixture of two or more of aluminum sulfate, aluminum chloride, magnesium sulfate, aluminum silicate, and zinc sulfate.

[0012] In a preferred embodiment of the present invention, the dispersant is selected from one or a mixture of two or more of sodium polyacrylate, polyvinylpyrrolidone, sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and polyvinyl alcohol.

[0013] In a preferred embodiment of the present invention, the pH adjuster is sodium hydroxide and / or potassium hydroxide.

[0014] A second aspect of the present invention provides a method for preparing a sludge conditioner consisting of nanoscale hydrophobic materials loaded with polynuclear metal chelates, the method comprising the following steps:

[0015] S1: Dissolve the nano-hydrophobic material in deionized water and mix thoroughly.

[0016] S2: Add dispersant to S1 according to the weight ratio under stirring conditions;

[0017] S3: While S2 is being stirred, add chelated iron solution and polynuclear metal salt to S2 in sequence to obtain a mixed solution;

[0018] S4: Place the mixture obtained in S3 under microwave heating at 40-60℃ for 30 minutes. After the reaction is complete, add the pH adjuster, mix and stir evenly to obtain the final product.

[0019] In a preferred embodiment of the present invention, the method for preparing the chelated iron solution is as follows:

[0020] S1: Weigh out each raw material in a molar ratio of 5:5 to 7:3 for ferric sulfate and ferrous sulfate, mix them, and obtain iron salt;

[0021] S2: Add iron salt to deionized water, keep stirring, add chelating agent, continue stirring until homogeneous, adjust the pH of the solution to between 8.0 and 10.0, and continue stirring for 0.5 hours to obtain chelated iron solution.

[0022] A third aspect of the present invention provides a biodegradable polymeric organic base for sludge cell wall breaking and dewatering, wherein the polymeric organic base comprises, by weight percentage, the following components: 5-10% cationic surfactant, 10-20% polymeric organic base, 2-5% persulfate, 1-3% pH adjuster, and the balance being deionized water.

[0023] In a preferred embodiment of the present invention, the cationic surfactant is selected from one or a mixture of two or more of dodecyl dimethyl benzyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride, dodecyl trimethyl ammonium chloride, and hexadecyl trimethyl ammonium chloride.

[0024] In a preferred embodiment of the present invention, the polymeric organic base is polydimethyldiallylammonium chloride and / or polyamine.

[0025] In a preferred embodiment of the present invention, the persulfate is selected from one or a mixture of two or more of potassium persulfate, sodium persulfate, and ammonium persulfate.

[0026] In a preferred embodiment of the present invention, the pH adjuster is sodium hydroxide and / or potassium hydroxide.

[0027] A fourth aspect of the present invention provides a method for preparing a biodegradable polymeric organic base for sludge cell wall breaking and dewatering, the method comprising the following steps:

[0028] S1: Mix pH adjuster and deionized water at a weight ratio of 1:20-60 to prepare mixture A;

[0029] S2: Mix persulfate and mixture A in the specified weight proportions to prepare mixture B;

[0030] S3: Add cationic surfactant and polymeric organic base to mixture B in parts by weight, stir evenly, and obtain liquid cell disruptor.

[0031] The fifth aspect of the present invention provides a composite sludge conditioner, comprising the aforementioned sludge conditioner of nanoscale hydrophobic material loaded with polynuclear metal chelates, and the aforementioned biodegradable polymeric organic alkali for sludge cell wall breaking and dewatering.

[0032] In a preferred embodiment of the present invention, the mass ratio of the sludge conditioner containing the nanoscale hydrophobic material loaded with polynuclear metal chelates to the biodegradable polymeric organic alkali used for sludge cell wall breaking and dewatering is (600-1000):(85-120).

[0033] By employing the above technical solution, the present invention has at least the following advantages:

[0034] 1. In one aspect of the present invention, a nanoscale chelated suspension component produced by using hydrophobic materials to load a coordinating iron chelating agent in conjunction with polynuclear metal catalysts and other raw materials greatly enhances the double electric layer, charge neutralization, and entrapment effects of the product, thereby improving bridging, flocculation, and rapid sedimentation effects.

[0035] 2. In another aspect of the present invention, high-density positively charged clouds are formed through chain breaking, decomposition, and ionization of biodegradable polymeric organic base components, thereby achieving the destabilization of negatively charged colloidal particles. This allows for the complete breaking of cell walls and the release of intracellular and interstitial water in the colloidal organic matter. The dispersed organic colloids and different positively charged clouds form micro-flocs. The destabilization, cell wall breaking, and interstitial water release are increased and seepage resistance is reduced. After the sludge colloidal system is destroyed, it is then flocculated, achieving maximum separation of sludge and water and reducing the sludge moisture content.

[0036] 3. In practical applications, the composite sludge conditioner of this invention can not only achieve a sludge cake moisture content of <60% after treatment, but also reduce sludge dewatering costs by 20-40%. The invented composite sludge conditioner exhibits excellent dewatering effects on sludge produced from municipal wastewater, industrial park wastewater, and enterprise wastewater in processes such as plate and frame filter presses, centrifuges, and screw presses. Its main advantages are as follows: 1) The hydrophobic material-loaded coordination iron chelating agent, in conjunction with a multi-nuclear metal catalyst composite product, possesses coordination, chelation, catalysis, bridging, flocculation, double-layer neutralization, and trapping functions, resulting in rapid sedimentation and rapid, continuous sludge dewatering, achieving solid-liquid separation, controlling the sludge cake moisture content to <60%, and truly reducing volume and size, thus saving disposal costs; 2) It replaces inorganic salt flocculants / coagulants and lime-based products, significantly reducing sludge volume increments; 3) It reduces filter cloth clogging and extends service life; 4) It helps increase the organic matter content of the sludge, which is beneficial for subsequent composting and other landscaping projects.

[0037] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0038] Figure 1 This is a process flow diagram of the conditioner for sludge dewatering according to the present invention. Detailed Implementation

[0039] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0040] This invention combines a hydrophobic material-loaded coordinating iron chelating agent with a polynuclear metal catalyst and a biodegradable polymeric organic base to obtain a composite sludge conditioner. First, the coordinating iron chelating agent component contains multivalent iron atoms, iron ions, and organic ligands with lone pairs of electrons, forming cyclic monomer molecules with strong complexing ability. These monomer molecules are synergistically compounded with a polynuclear metal catalyst containing potassium, aluminum, iron, and magnesium, and are linked together by van der Waals forces, electric dipole moment polarization forces, and hydrogen bonds to form a long-chain helical chelate, thus possessing functions such as coordination, chelation, catalysis, permeation, bridging, flocculation, double-layer neutralization, and entrapment / sweeping. Second, the biodegradable polymeric organic base product used in the combination is a product containing superoxide anions (O2). - ), hydroxyl radicals (OH) - The compound sludge conditioner of this invention is a mixture of linearly polymerized organic bases with reactive oxygen groups such as α-oxygen and α-oxygen. Sludge microorganisms contain 30-60% protein, and reactive oxygen groups have a targeted function to destroy proteins. This destruction reaction occurs through the chain breaking and decomposition of organic bases into small molecules and the destruction of extracellular polymers in the sludge system. Finally, the compound sludge conditioner of this invention can destroy the EPS of the sludge system, dissolve microbial cells in the sludge, release bound water and interstitial water in the sludge, reduce electrostatic repulsion, improve the hydrophobicity of microbial cells in the sludge, and release free water and surface water, thereby greatly improving the dewatering performance of the sludge.

[0041] A composite sludge conditioner was developed by combining a sludge conditioner containing a nano-scale hydrophobic material-loaded polynuclear metal chelate (Agent A) with a biodegradable polymeric organic alkali for sludge cell wall breaking and dewatering (Agent B). The innovation lies in developing a novel sludge dewatering agent combination that replaces lime, iron salts, and aluminum salts. Agent A is a homogeneous suspension formed by the reaction of a nano-scale silicon-based hydrophobic material-loaded coordination iron chelate with a polynuclear metal catalyst. Agent B is a biodegradable polymeric organic alkali containing active oxygen groups, generated under oxygen-rich conditions from an unsaturated organic alkali. The combined use of Agent A and Agent B effectively breaks down the cell walls of organic biomass in the sludge, thereby disrupting the EPS (explosive permeable material) of the sludge system, dissolving microbial cells in the sludge, releasing bound water and interstitial water within the sludge, and reducing electrostatic repulsion. The addition of the hydrophobic material provides a skeletal channel for sludge dewatering, improving the hydrophobicity of microbial cells in the sludge, releasing free water and surface water, ensuring smooth water permeability, preventing filter media clogging, reducing equipment wear and maintenance, and significantly improving work efficiency.

[0042] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods.

[0043] Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0044] Example 1:

[0045] Preparation of chelated iron solution: Weigh out ferric sulfate and ferrous sulfate in a molar ratio of 5:5, mix them to obtain iron salt; add the iron salt to deionized water, keep stirring, add ethylenediaminetetraacetic acid (added in a molar ratio of 3.5:1 with the iron salt), continue stirring until homogeneous, adjust the pH of the solution to 9.0, and continue stirring for 0.5 h to obtain chelated iron solution.

[0046] Preparation of sludge conditioner:

[0047] Prepare the following raw materials by weight percentage: 15% bentonite, 32.5% chelated iron solution, 12.5% ​​aluminum sulfate, 7.5% sodium polyacrylate, 3.5% sodium hydroxide, and the balance deionized water.

[0048] S1: Dissolve bentonite in deionized water and mix thoroughly; S2: Add sodium polyacrylate to S1 according to the weight ratio while stirring; S3: While S2 is being stirred, add chelated iron solution and aluminum sulfate to S2 in sequence to obtain a mixed solution; S4: Heat the mixed solution obtained in S3 at 50°C under microwave for 30 minutes. After the reaction is complete, add sodium hydroxide and mix thoroughly to obtain the final product.

[0049] Example 2:

[0050] Preparation of chelated iron solution: Weigh out ferric sulfate and ferrous sulfate in a molar ratio of 6:4, mix them to obtain iron salt; add the iron salt to deionized water, keep stirring, add disodium ethylenediaminetetraacetate (added in a molar ratio of 2:1 to the iron salt), continue stirring until homogeneous, adjust the pH of the solution to 10.0, and continue stirring for 0.5 h to obtain chelated iron solution.

[0051] Preparation of sludge conditioner:

[0052] Prepare the following raw materials by weight percentage: attapulgite 20%, chelated iron solution 30%, aluminum chloride 10%, polyvinylpyrrolidone 10%, sodium hydroxide 2%, and the balance deionized water.

[0053] S1: Dissolve attapulgite in deionized water and mix thoroughly; S2: Add polyvinylpyrrolidone to S1 according to the weight ratio while stirring; S3: While S2 is being stirred, add chelated iron solution and aluminum chloride to S2 in sequence to obtain a mixed solution; S4: Heat the mixed solution obtained in S3 at 50°C under microwave for 30 minutes. After the reaction is complete, add sodium hydroxide and mix thoroughly to obtain the final product.

[0054] Example 3:

[0055] Preparation of chelated iron solution: Weigh out ferric sulfate and ferrous sulfate in a molar ratio of 7:3, mix them to obtain iron salt; add the iron salt to deionized water, keep stirring, add ethylenediamine disuccinic acid (added in a molar ratio of 5:1 to the iron salt), continue stirring until homogeneous, adjust the pH of the solution to 8.0, and continue stirring for 0.5 h to obtain chelated iron solution.

[0056] Preparation of sludge conditioner:

[0057] Prepare the following raw materials by weight percentage: 10% diatomaceous earth, 35% chelated iron solution, 15% aluminum silicate, 5% sodium dodecyl sulfonate, 5% sodium hydroxide, and the balance deionized water.

[0058] S1: Dissolve diatomaceous earth in deionized water and mix thoroughly; S2: Add sodium dodecyl sulfonate to S1 according to the weight ratio under stirring; S3: While S2 is being stirred, add chelated iron solution and aluminum silicate to S2 in sequence to obtain a mixed solution; S4: Heat the mixed solution obtained in S3 under microwave at 50°C for 30 minutes. After the reaction is complete, add sodium hydroxide and mix thoroughly to obtain the final product.

[0059] Comparative Example 1:

[0060] Same as Example 1, except that the sludge conditioner does not contain bentonite.

[0061] Comparative Example 2:

[0062] Same as Example 1, except that the sludge conditioner does not contain chelated iron solution.

[0063] Comparative Example 3:

[0064] Same as Example 1, except that the sludge conditioner does not contain bentonite and chelated iron solution.

[0065] Example 4:

[0066] Prepare the following raw materials by weight percentage: 7.5% dodecyl dimethyl benzyl ammonium chloride, 15% polydimethyl diallyl ammonium chloride, 3.5% potassium persulfate, 2% sodium hydroxide, and the balance deionized water.

[0067] S1: Sodium hydroxide and deionized water are mixed evenly at a weight ratio of 1:40 to prepare mixture A; S2: Potassium persulfate is mixed evenly with mixture A according to the weight parts to prepare mixture B; S3: Dodecyl dimethyl benzyl ammonium chloride and polydimethyl diallyl ammonium chloride are added to mixture B in the order of weight parts, and stirred evenly to obtain a liquid cell disruptor.

[0068] Example 5:

[0069] The following ingredients are prepared by weight percentage: 10% tetradecyl dimethyl benzyl ammonium chloride, 10% polydimethyl diallyl ammonium chloride, 5% sodium persulfate, 1% sodium hydroxide, and the balance deionized water.

[0070] S1: Sodium hydroxide and deionized water are mixed evenly at a weight ratio of 1:40 to prepare mixture A; S2: Sodium persulfate is mixed evenly with mixture A according to the weight parts to prepare mixture B; S3: Tetradecyl dimethyl benzyl ammonium chloride and polydimethyl diallyl ammonium chloride are added to mixture B in the order of weight parts, and stirred evenly to obtain a liquid cell disruptor.

[0071] Example 6:

[0072] Prepare the following ingredients by weight percentage: 5% dodecyltrimethylammonium chloride, 20% polydimethyldiallylammonium chloride, 2% ammonium persulfate, 3% sodium hydroxide, and the remainder deionized water.

[0073] S1: Mix sodium hydroxide and deionized water at a weight ratio of 1:40 to prepare mixture A; S2: Mix ammonium persulfate and mixture A at a weight ratio to prepare mixture B; S3: Add dodecyltrimethylammonium chloride and polydimethyldiallylammonium chloride to mixture B in parts by weight, stir evenly, and obtain a liquid cell disruptor.

[0074] Comparative Example 4:

[0075] Same as Example 4, except that the biodegradable polymeric organic base does not contain dodecyl dimethyl benzyl ammonium chloride.

[0076] Comparative Example 5:

[0077] Same as Example 4, except that the biodegradable polymeric organic base does not contain polydimethyldiallyl ammonium chloride.

[0078] Comparative Example 6:

[0079] Same as Example 4, except that the biodegradable polymeric organic base does not contain dodecyl dimethyl benzyl ammonium chloride and polydimethyl diallyl ammonium chloride.

[0080] Example 7:

[0081] The sludge conditioner prepared in Example 1 and the biodegradable polymeric organic base prepared in Example 4 were mixed at a mass ratio of 1000:120 to obtain a composite sludge conditioner.

[0082] Example 8:

[0083] The sludge conditioner prepared in Example 1 and the biodegradable polymeric organic base prepared in Example 4 were mixed at a mass ratio of 800:100 to obtain a composite sludge conditioner.

[0084] Example 9:

[0085] The sludge conditioner prepared in Example 1 and the biodegradable polymeric organic base prepared in Example 4 were mixed in a mass ratio of 660:90 to obtain a composite sludge conditioner.

[0086] Example 10:

[0087] The sludge conditioner prepared in Example 1 and the biodegradable polymeric organic base prepared in Example 4 were mixed at a mass ratio of 600:85 to obtain a composite sludge conditioner.

[0088] Experimental Example 1: Testing the effect of different sludge conditioners on sludge dewatering at a municipal wastewater treatment plant in Beijing

[0089] 1. See the sludge dewatering treatment process flow diagram. Figure 1 .

[0090] in,

[0091] 1) Conditioning tank volume (m³) 3 (100 x 2 pieces); Preparation time (min) (30 min);

[0092] 2) Moisture content of the incoming mud (approximately 98%); Moisture content of the dewatered mud cake (≤60%);

[0093] 3) Sludge moisture content standard: GB24188-2009, 60% moisture content;

[0094] 4) Plate and frame filter press type: Jingjin plate and frame filter press (2 units), plate and frame filtration area 450m² 2 .

[0095] 2. Sludge dewatering process operation and equipment control parameters

[0096] 1) Sludge feed rate (m) 3 / batch (50~80); mud production per plate and frame t / batch (1.5~1.8t oven-dried);

[0097] 2) Low-pressure feed pressure MPa (0.6); Low-pressure feed time s (2000);

[0098] 3) High-pressure feed pressure MPa (1.1); High-pressure feed time s (2500);

[0099] 4) Pressing pressure MPa (1.6); Constant pressure pressing time s (3600);

[0100] 5) Running time / batch (approximately 4 hours); Number of batches run / day (2-7).

[0101] The products obtained in Examples 1-10 and Comparative Examples 1-6 were subjected to sludge dewatering using the above-described process and parameters. The results are shown in Table 1.

[0102] Table 1. Detection of the effect of different sludge conditioners on sludge dewatering.

[0103]

[0104]

[0105] Note: The amount of sludge fed is a measure of the speed of sludge filtration and also an indirect measure of the softness and hardness of the sludge cake. Since the filter chamber space of a plate and frame filter press is fixed, a large amount of sludge fed indicates that the sludge is hydrophobic and has good filtration properties, making it easier to press. In addition, the more sludge fed, the higher the degree of sludge expansion per unit volume. The larger the sludge volume, the more conducive it is to pressing, and the drier the pressed sludge cake.

[0106] In the table: A refers to sludge conditioner with nanoscale hydrophobic materials supporting polynuclear metal chelates; B refers to biodegradable polymeric organic alkali used for sludge cell wall breaking and dewatering.

[0107] The results in Table 1 show that:

[0108] (1) Both hydrophobic materials and chelated iron solutions have a certain synergistic effect on sludge dewatering of sludge conditioner (Agent A) loaded with nano-hydrophobic materials and polynuclear metal chelates.

[0109] (2) Both cationic surfactants and polymeric organic bases have a certain synergistic effect on the dewatering of sludge using biodegradable polymeric organic bases (Agent B) for sludge cell wall breaking and dewatering;

[0110] (3) The sludge conditioner (A agent) loaded with nano-hydrophobic materials and polynuclear metal chelates and the biodegradable polymeric organic alkali (B agent) used for sludge cell wall breaking and dewatering are used together. The sludge dewatering effect is better than the effect of using them alone, and the technical effect of the product combination is "1+1>2".

[0111] (4) The combined use of sludge conditioner (A agent) loaded with nano-hydrophobic materials and polynuclear metal chelates and colloidal cell wall disruptor (B agent) increases the proportion of biodegradable polymeric organic base (B agent) used for sludge cell wall disruption and dewatering, which helps to improve product efficiency.

[0112] Experimental Example 2: Testing the Dewatering Effect of Different Sludge Conditioners on High Organic Matter Sludge from a Wastewater Treatment Plant in Gansu Province

[0113] 1. See the sludge dewatering treatment process flow diagram. Figure 1 .

[0114] 1) Conditioning tank volume (m³) 3 (175.5*4 pieces); Preparation time (min) (90min);

[0115] 2) Moisture content of incoming mud (98%–96%); Moisture content of dewatered mud cake (≤60%);

[0116] 3) Sludge moisture content standard: GB24188-2009, 60% moisture content;

[0117] 4) Plate and frame filter press type: Jingjin plate and frame filter press (8 units), plate and frame filtration area 800m² 2 .

[0118] 2. Sludge dewatering process control parameters

[0119] 1) Sludge feed rate (m) 3 / batch (approximately 100); mud production per plate frame t / batch (2.5~3.5t oven-dried);

[0120] 2) Low-pressure feed pressure MPa (0.8); Low-pressure feed time s (9000);

[0121] 3) High-pressure feed pressure (MPa, 1.2); High-pressure feed time (s, 3600);

[0122] 4) Pressing pressure MPa (1.4); Constant pressure pressing time s (2700);

[0123] 5) Running time per board / batch (approximately 270 minutes); Number of batches run / day (28).

[0124] The products obtained in Examples 1, 4, 7 and Comparative Examples 1-6 were subjected to sludge dewatering using the above-mentioned processes and parameters. The results are shown in Table 2.

[0125] Table 2. Detection of the effect of different sludge conditioners on sludge dewatering.

[0126]

[0127] The results in Table 2 show that:

[0128] (1) Both hydrophobic materials and chelated iron solutions have a certain synergistic effect on sludge dewatering of sludge conditioner (Agent A) loaded with nano-hydrophobic materials and polynuclear metal chelates.

[0129] (2) Both cationic surfactants and polymeric organic bases have a certain synergistic effect on the dewatering of sludge using biodegradable polymeric organic bases (Agent B) for sludge cell wall breaking and dewatering;

[0130] (3) The sludge conditioner (A agent) loaded with nano-hydrophobic materials and polynuclear metal chelates and the biodegradable polymeric organic alkali (B agent) used for sludge cell wall breaking and dewatering are used together. The sludge dewatering effect is better than the effect of using them alone, and the technical effect of the product combination is "1+1>2".

[0131] (4) For high organic matter sludge, the combination of sludge conditioner (A agent) loaded with nano-hydrophobic materials and polynuclear metal chelates and biodegradable polymeric organic alkali (B agent) for sludge cell wall breaking and dewatering has the advantages of low dosage and good sludge dewatering effect. It also avoids the introduction of a large amount of lime and the increase in sludge volume is low. Under the premise of reducing sludge disposal costs, it also effectively reduces sludge transportation costs.

[0132] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the methods and techniques disclosed above without departing from the scope of the present invention to create equivalent embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. Use of a composite sludge conditioner in dewatering of sludge, characterized in that, The sludge conditioner comprising nanoscale hydrophobic material loaded polynuclear metal chelate and the degradable polymeric organic alkali for sludge wall breaking dewatering; the mass ratio of the sludge conditioner comprising nanoscale hydrophobic material loaded polynuclear metal chelate to the degradable polymeric organic alkali for sludge wall breaking dewatering is (600-1000):(85-120); The sludge conditioner comprising nanoscale hydrophobic material loaded polynuclear metal chelate comprises the following components in the following content by weight percentage: hydrophobic material 10-20%, chelated iron solution 30-35%, aluminum sulfate and / or aluminum silicate 10-15%, dispersant 5-10%, pH adjuster 2-5%, and the balance of deionized water; The degradable polymeric organic alkali for sludge wall breaking dewatering comprises the following components in the following content by weight percentage: cationic surfactant 5-10%, polydimethyl diallyl ammonium chloride 10-20%, persulfate 2-5%, pH adjuster 1-3%, and the balance of deionized water; The hydrophobic material is selected from one or more than two kinds of mixture of bentonite, attapulgite, diatomite, montmorillonite and zeolite powder; The chelated iron solution is a mixed solution prepared by mixing a chelating agent and an iron salt in a molar ratio of 2:1-5:1; The cationic surfactant is selected from one or more than two kinds of mixture of dodecyl dimethyl benzyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride, dodecyl trimethyl ammonium chloride and hexadecyl trimethyl ammonium chloride.

2. Use according to claim 1, characterized in that, The chelating agent is selected from any one or more than two kinds of mixture of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, ethylenediaminedisuccinic acid and citric acid.

3. Use according to claim 1, characterized in that, The iron salt is ferric sulfate and / or ferrous sulfate; when the iron salt is ferric sulfate and ferrous sulfate, the molar ratio of the ferric sulfate and the ferrous sulfate is 5:5-7:

3.

4. The use according to claim 1, wherein The dispersant is selected from one or more than two kinds of mixture of sodium polyacrylate, polyvinylpyrrolidone, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and polyvinyl alcohol; The pH adjuster is sodium hydroxide and / or potassium hydroxide.

5. The use according to claim 1, characterized in that, The preparation method of the sludge conditioner comprising nanoscale hydrophobic material loaded polynuclear metal chelate comprises the following steps: S1: dissolving nanoscale hydrophobic material in deionized water and mixing and stirring uniformly; S2: adding dispersant to S1 in a weight ratio under stirring; S3: adding chelated iron solution, aluminum sulfate and / or aluminum silicate to S2 in sequence under stirring to obtain a mixed solution; S4: heating the mixed solution obtained in S3 under microwave at 40-60℃ for 30 min, adding pH adjuster after the reaction is completed, and mixing and stirring uniformly to obtain the sludge conditioner comprising nanoscale hydrophobic material loaded polynuclear metal chelate.

6. Use according to claim 3, characterized in that, The preparation method of the chelated iron solution is as follows: S1: weighing each raw material in a molar ratio of 5:5-7:3, mixing to obtain an iron salt; S2: adding the iron salt to deionized water under stirring, adding a chelating agent, continuously stirring uniformly, adjusting the pH of the solution to 8.0-10.0, and continuously stirring for 0.5 h to obtain the chelated iron solution.

7. The use according to claim 1, characterized in that, the persulfate salt is selected from one or more of potassium persulfate, sodium persulfate, and ammonium persulfate; the pH regulator is sodium hydroxide and / or potassium hydroxide.

8. The use according to claim 1, characterized in that, The preparation method of the degradable polymeric organic base for sludge wall breaking and dewatering comprises the following steps: S1: uniformly stirring the pH regulator and deionized water in a weight ratio of 1:20-60 to prepare a mixed solution A; S2: uniformly stirring the persulfate salt and the mixed solution A in a weight ratio to prepare a mixed solution B; S3: adding the cationic surfactant and the polydimethyl diallyl ammonium chloride in a weight ratio to the mixed solution B in sequence, uniformly stirring, and preparing the degradable polymeric organic base for sludge wall breaking and dewatering.

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