Preparation method of water treatment honeycomb filler

Abstract

The invention relates to a preparation method of a water treatment honeycomb filler, and belongs to the field of water treatment materials. The surface of the stainless steel honeycomb filler is coated with a neodymium tungstate-iron tungstate composite active layer, wherein neodymium tungstate and iron tungstate account for 1.8%-1.9% and 1.5%-1.6% of the mass of the water treatment honeycomb filler respectively. The composite active layer is tightly combined with the stainless steel honeycomb filler, organic pollutants in water can be degraded under illumination, and the water treatment efficiency of the water treatment honeycomb filler can be fully exerted. The water treatment honeycomb filler can be used for purification treatment of organic pollutants in industrial and civil sewage, does not need frequent regeneration treatment in the use process, and is suitable for a continuous and stable sewage treatment process.

Description

Technical Field

[0001] The invention belongs to the field of water treatment materials, and in particular relates to a method for preparing a water treatment honeycomb filler. Background Art

[0002] Honeycomb fillers are mainly used for various sedimentation and sand removal, and are widely used in water treatment devices. They have the advantages of wide application range, high treatment effect, and small footprint, and are suitable for industrial and domestic sewage treatment. They are used in tower biofilters, high-load biofilters and contact oxidation tanks, as well as microbial carriers of biological turntables, mainly for biochemical treatment of industrial organic wastewater and urban sewage.

[0003] Industrial wastewater usually contains organic pollutants that are toxic to microorganisms. When these organic substances attach to the honeycomb filler, they will greatly inhibit the activity of microorganisms, thereby reducing the efficiency of water treatment. Effective methods must be taken to remove toxic organic pollutants in water. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention aims to provide a method for preparing a water treatment honeycomb filler, which can be used to purify organic pollutants in sewage.

[0005] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0006] Step 1: Acid treatment of stainless steel honeycomb filler

[0007] The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, the solution was heated to 45°C, kept warm for 35 minutes, washed with pure water, and dried at 90°C for 7 hours to obtain an acid-treated stainless steel honeycomb filler;

[0008] Step 2: Coating with Iron Tungstate

[0009] Add 9.2-10.5 g of ammonium metatungstate, 6.5-7.1 g of sodium dihydrogen phosphate, and 5.1-5.6 g of sodium bicarbonate to 600 mL of pure water, and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler described in step 1 in solution A, heat the solution to 85° C., keep the solution warm for 160 min, dry it at 130° C. for 5 h, and then calcine it at 450-480° C. for 3.5 h to obtain a stainless steel honeycomb filler coated with iron tungstate;

[0010] Step 3: Coating with NdT

[0011] Add 11.0-12.5g of ammonium metatungstate, 5.2-5.7g of propylene glycol, and 6.3-6.9g of emulsifier OP-10 to 600mL of ethanol, and stir to form solution B; add 7.3-8.2g of neodymium nitrate and 3.5-3.8g of sodium dihydrogen phosphate to 200mL of pure water, and stir to form solution C; mix solution B and solution C evenly, and then add the stainless steel honeycomb filler described in step 2, heat the solution to 55°C, and keep it warm for 30 minutes; dry the stainless steel honeycomb filler treated above at 120°C for 10 hours, and then calcine at 430-470°C for 3.5 hours to obtain a water-treated honeycomb filler.

[0012] Furthermore, the stainless steel honeycomb filler in step 1 is made of 304 stainless steel with a material density of 7.93 g / cm 3 The honeycomb filler has a pore size of 40 to 80 mm and is resistant to high temperatures of 800°C.

[0013] Furthermore, the water treatment honeycomb filler is a stainless steel honeycomb filler coated with a composite active layer of neodymium tungstate-iron tungstate, wherein the mass percentage of neodymium tungstate in the water treatment honeycomb filler is 1.8% to 1.9%, and the mass percentage of iron tungstate in the water treatment honeycomb filler is 1.5% to 1.6%.

[0014] Furthermore, the water treatment honeycomb filler has a sheet thickness of 0.55 to 0.65 mm and a specific surface area of ​​105 to 120 m 2 / m 3 .

[0015] A method for preparing a water treatment honeycomb filler has the following advantages compared with the prior art:

[0016] The present invention uses a stainless steel honeycomb filler as a base material, and coats a composite active layer of neodymium tungstate-iron tungstate on its surface. Since the stainless steel honeycomb filler participates in the reaction process of the iron tungstate active layer, the composite active layer is tightly combined with the stainless steel honeycomb filler. The composite active layer of neodymium tungstate-iron tungstate can degrade organic pollutants in water under light, reduce the enrichment of organic pollutants on the surface of the water treatment honeycomb filler, and give full play to the efficiency of the water treatment honeycomb filler in the water treatment process. The water treatment honeycomb filler can be used for the purification of organic pollutants in industrial and civil sewage, and does not need to be frequently regenerated during use, and is suitable for continuous and stable sewage treatment processes. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The reagents or instruments used without indicating the manufacturer are all conventional commercial products.

[0018] Example 1

[0019] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0020] Step 1: Acid treatment of stainless steel honeycomb filler

[0021] Immerse the stainless steel honeycomb filler in a 0.12 mol / L hydrochloric acid solution, heat the solution to 45°C, and keep it warm for 35 minutes; take out the stainless steel honeycomb filler after acid treatment, wash it with pure water, and dry it at 90°C for 7 hours;

[0022] Step 2: Coating with Iron Tungstate

[0023] Add 9.2g of ammonium metatungstate, 6.5g of sodium dihydrogen phosphate and 5.1g of sodium bicarbonate into 600mL of pure water and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler of step 1 into solution A, heat the solution to 85°C and keep it warm for 160min; dry the treated stainless steel honeycomb filler at 130°C for 5h, and then calcine at 450°C for 3.5h to obtain a stainless steel honeycomb filler coated with iron tungstate.

[0024] Step 3: Coating with NdT

[0025] Add 11.0g of ammonium metatungstate, 5.2g of propylene glycol and 6.3g of emulsifier OP-10 to 600mL of ethanol and stir to form solution B; add 7.3g of neodymium nitrate and 3.5g of sodium dihydrogen phosphate to 200mL of pure water and stir to form solution C; mix solution B and solution C evenly, then immerse the stainless steel honeycomb filler in step 2 into the mixed solution, heat the solution to 55°C and keep it warm for 30min; dry the stainless steel honeycomb filler treated as above at 120°C for 10h, and then calcine at 430°C for 3.5h to obtain a water-treated honeycomb filler.

[0026] The water treatment honeycomb filler prepared in this embodiment has a sheet thickness of 0.55 mm and a specific surface area of ​​105 m 2 / m 3 The mass percentages of neodymium tungstate and iron tungstate in the water treatment honeycomb filler are 1.8% and 1.5% respectively.

[0027] Example 2

[0028] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0029] Step 1: Acid treatment of stainless steel honeycomb filler

[0030] The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, and the solution was heated to 45°C and kept warm for 35 minutes; the stainless steel honeycomb filler after acid treatment was taken out, washed with pure water, and dried at 90°C for 7 hours.

[0031] Step 2: Coating with Iron Tungstate

[0032] Add 9.6g of ammonium metatungstate, 6.6g of sodium dihydrogen phosphate and 5.2g of sodium bicarbonate into 600mL of pure water and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler of step 1 into solution A, heat the solution to 85°C and keep it warm for 160min; dry the treated stainless steel honeycomb filler at 130°C for 5h, and then calcine at 460°C for 3.5h to obtain a stainless steel honeycomb filler coated with iron tungstate.

[0033] Step 3: Coating with NdT

[0034] Add 11.3g of ammonium metatungstate, 5.3g of propylene glycol and 6.4g of emulsifier OP-10 to 600mL of ethanol and stir to form solution B; add 7.5g of neodymium nitrate and 3.6g of sodium dihydrogen phosphate to 200mL of pure water and stir to form solution C; mix solution B and solution C evenly, then immerse the stainless steel honeycomb filler in step 2 into the mixed solution, heat the solution to 55°C and keep it warm for 30min; dry the stainless steel honeycomb filler treated as above at 120°C for 10h, and then calcine at 440°C for 3.5h to obtain a water-treated honeycomb filler.

[0035] The water treatment honeycomb filler prepared in this embodiment has a sheet thickness of 0.58 mm and a specific surface area of ​​109 m 2 / m 3 The mass percentages of neodymium tungstate and iron tungstate in the water treatment honeycomb filler are 1.82% and 1.53% respectively.

[0036] Example 3

[0037] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0038] Step 1: Acid treatment of stainless steel honeycomb filler

[0039] The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, and the solution was heated to 45°C and kept warm for 35 minutes; the stainless steel honeycomb filler after acid treatment was taken out, washed with pure water, and dried at 90°C for 7 hours.

[0040] Step 2: Coating with Iron Tungstate

[0041] Add 9.9g of ammonium metatungstate, 6.8g of sodium dihydrogen phosphate and 5.3g of sodium bicarbonate into 600mL of pure water and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler of step 1 into solution A, heat the solution to 85°C and keep it warm for 160min; dry the treated stainless steel honeycomb filler at 130°C for 5h, and then calcine at 465°C for 3.5h to obtain a stainless steel honeycomb filler coated with iron tungstate.

[0042] Step 3: Coating with NdT

[0043] Add 11.6g of ammonium metatungstate, 5.4g of propylene glycol and 6.6g of emulsifier OP-10 to 600mL of ethanol and stir to form solution B; add 7.8g of neodymium nitrate and 3.6g of sodium dihydrogen phosphate to 200mL of pure water and stir to form solution C; mix solution B and solution C evenly, immerse the stainless steel honeycomb filler in step 2 into the mixed solution, heat the solution to 55°C and keep it warm for 30min; dry the stainless steel honeycomb filler treated as above at 120°C for 10h, and then calcine at 450°C for 3.5h to obtain a water-treated honeycomb filler.

[0044] The water treatment honeycomb filler prepared in this embodiment has a sheet thickness of 0.59 mm and a specific surface area of ​​112 m 2 / m 3 The mass percentages of neodymium tungstate and iron tungstate in the water treatment honeycomb filler are 1.85% and 1.55% respectively.

[0045] Example 4

[0046] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0047] Step 1: Acid treatment of stainless steel honeycomb filler

[0048] The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, and the solution was heated to 45°C and kept warm for 35 minutes; the stainless steel honeycomb filler after acid treatment was taken out, washed with pure water, and dried at 90°C for 7 hours.

[0049] Step 2: Coating with Iron Tungstate

[0050] Add 10.2g of ammonium metatungstate, 6.9g of sodium dihydrogen phosphate and 5.5g of sodium bicarbonate into 600mL of pure water and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler of step 1 into solution A, heat the solution to 85°C and keep it warm for 160min; dry the treated stainless steel honeycomb filler at 130°C for 5h, and then calcine at 470°C for 3.5h to obtain a stainless steel honeycomb filler coated with iron tungstate.

[0051] Step 3: Coating with NdT

[0052] Add 12.1g of ammonium metatungstate, 5.5g of propylene glycol and 6.7g of emulsifier OP-10 to 600mL of ethanol and stir to form solution B; add 7.9g of neodymium nitrate and 3.7g of sodium dihydrogen phosphate to 200mL of pure water and stir to form solution C; mix solution B and solution C evenly, then immerse the stainless steel honeycomb filler in step 2 into the mixed solution, heat the solution to 55°C and keep it warm for 30min; dry the stainless steel honeycomb filler treated as above at 120°C for 10h, and then calcine at 460°C for 3.5h to obtain a water-treated honeycomb filler.

[0053] The water treatment honeycomb filler prepared in this embodiment has a sheet thickness of 0.61 mm and a specific surface area of ​​115 m 2 / m 3 The mass percentages of neodymium tungstate and iron tungstate in the water treatment honeycomb filler are 1.87% and 1.56% respectively.

[0054] Example 5

[0055] A method for preparing a water treatment honeycomb filler comprises the following process steps:

[0056] Step 1: Acid treatment of stainless steel honeycomb filler

[0057] The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, and the solution was heated to 45°C and kept warm for 35 minutes; the stainless steel honeycomb filler after acid treatment was taken out, washed with pure water, and dried at 90°C for 7 hours.

[0058] Step 2: Coating with Iron Tungstate

[0059] Add 10.5g of ammonium metatungstate, 7.1g of sodium dihydrogen phosphate and 5.6g of sodium bicarbonate into 600mL of pure water and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler of step 1 into solution A, heat the solution to 85°C and keep it warm for 160min; dry the treated stainless steel honeycomb filler at 130°C for 5h, and then calcine at 480°C for 3.5h to obtain a stainless steel honeycomb filler coated with iron tungstate.

[0060] Step 3: Coating with NdT

[0061] Add 12.5g of ammonium metatungstate, 5.7g of propylene glycol and 6.9g of emulsifier OP-10 to 600mL of ethanol and stir to form solution B; add 8.2g of neodymium nitrate and 3.8g of sodium dihydrogen phosphate to 200mL of pure water and stir to form solution C; mix solution B and solution C evenly, immerse the stainless steel honeycomb filler in step 2 into the mixed solution, heat the solution to 55°C and keep it warm for 30min; dry the stainless steel honeycomb filler treated as above at 120°C for 10h, and then calcine at 470°C for 3.5h to obtain a water-treated honeycomb filler.

[0062] The water treatment honeycomb filler prepared in this embodiment has a sheet thickness of 0.65 mm and a specific surface area of ​​120 m 2 / m 3 The mass percentages of neodymium tungstate and iron tungstate in the water treatment honeycomb filler are 1.9% and 1.6% respectively.

[0063] The above technical scheme explains the technical idea of ​​the present invention, which cannot be used to limit the protection scope of the present invention. Any changes and modifications made to the above technical scheme based on the technical essence of the present invention without departing from the content of the technical scheme of the present invention shall fall within the protection scope of the technical scheme of the present invention.

Claims

1. A method for preparing a water treatment honeycomb filler, characterized in that: The process steps include: Step 1: Acid treatment of stainless steel honeycomb filler The stainless steel honeycomb filler was immersed in a 0.12 mol / L hydrochloric acid solution, the solution was heated to 45°C, kept warm for 35 minutes, washed with pure water, and dried at 90°C for 7 hours to obtain an acid-treated stainless steel honeycomb filler; Step 2: Coating with Iron Tungstate Add 9.2-10.5 g of ammonium metatungstate, 6.5-7.1 g of sodium dihydrogen phosphate, and 5.1-5.6 g of sodium bicarbonate to 600 mL of pure water, and stir to form solution A; immerse the acid-treated stainless steel honeycomb filler described in step 1 in solution A, heat the solution to 85° C., keep the solution warm for 160 min, dry it at 130° C. for 5 h, and then calcine it at 450-480° C. for 3.5 h to obtain a stainless steel honeycomb filler coated with iron tungstate; Step 3: Coating with NdT Add 11.0-12.5g of ammonium metatungstate, 5.2-5.7g of propylene glycol, and 6.3-6.9g of emulsifier OP-10 to 600mL of ethanol, and stir to form solution B; add 7.3-8.2g of neodymium nitrate and 3.5-3.8g of sodium dihydrogen phosphate to 200mL of pure water, and stir to form solution C; mix solution B and solution C evenly, and then add the stainless steel honeycomb filler described in step 2, heat the solution to 55°C, and keep it warm for 30 minutes; dry the stainless steel honeycomb filler treated above at 120°C for 10 hours, and then calcine at 430-470°C for 3.5 hours to obtain a water-treated honeycomb filler.

2. The method for preparing a water treatment honeycomb filler according to claim 1, characterized in that: The stainless steel honeycomb filler in step 1 is made of 304 stainless steel with a material density of 7.93 g / cm 3 The honeycomb filler has a pore size of 40 to 80 mm and is resistant to high temperatures of 800°C.

3. The method for preparing a water treatment honeycomb filler according to claim 1, characterized in that: The water treatment honeycomb filler is a stainless steel honeycomb filler coated with a composite active layer of neodymium tungstate-iron tungstate, wherein the mass percentage of neodymium tungstate in the water treatment honeycomb filler is 1.8% to 1.9%, and the mass percentage of iron tungstate in the water treatment honeycomb filler is 1.5% to 1.6%.

4. The method for preparing a water treatment honeycomb filler according to claim 1, characterized in that: The water treatment honeycomb filler has a sheet thickness of 0.55 to 0.65 mm and a specific surface area of ​​105 to 120 m 2 / m 3 .