Biofilm for wastewater treatment and preparation method thereof

Abstract

Specifically relating to the technical field of wastewater purification, the invention provides a biofilm for wastewater treatment and a preparation method thereof. According to the invention, polylactic acid and polyvinyl alcohol are employed for formic acid catalyzed polymerization to obtain a biotrickling filter filler, then nutrient mud is inoculated to the filler and a nutrient solution is sprayed to obtain the biofilm for wastewater treatment. The biofilm prepared according to the invention has good compatibility with the filler, can be stably attached to the filler, the fixation time can be shorten to a minimum of 3h, and the biofilm can have a high efficiency removal rate of hardly degradable pollutants, a removal rate of organic matters in industrial wastewater to 90% or more, a removal rate of 1, 4-dioxane up to 94% or more, and a dioxin removal rate up to 93% or more. Another purpose of the invention is to provide a preparation method of the biofilm, the method is stable, controllable, and easy to realize, and is suitable for large-scale production.

Description

[0001]

Technical field

[0002] The invention relates to the technical field of wastewater purification technology, in particular to a biofilm for wastewater treatment and a preparation method thereof.

[0003]

Background technique

[0004] Industrial wastewater often contains a large amount of organic pollutants, which need to be purified before being discharged into the sewer. Refractory organic substances such as 1,4-dioxane and dioxin are difficult to deal with. If the degradation is not complete, it will harm animals and plants. cause great harm to the environment. At present, the treatment technologies for industrial wastewater include absorption, adsorption, incineration, catalytic and biological treatment technologies. Among them, biological treatment technology includes biological filtration, biological trickling filtration and biological washing technology, etc., which have the advantages of good treatment effect, no secondary pollution, low investment and operat...

Examples

Embodiment 1

[0039] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0040] a. According to the weight ratio, take 20 parts of polylactic acid and 4 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 87 ° C, then add 10 parts of soybean protein isolate, and stir for 150 minutes;

[0041] Wherein, the mass fraction of formic acid solution is 30%.

[0042] b. Cool down to 50°C, add 4 parts of polyvinyl alcohol and 0.2 parts of manganese acetate, then raise the temperature to 96°C for 64 minutes, then cool down to 60°C;

[0043] c. Keep the temperature at 60°C, add 14 parts of ceramic powder, stir for 12 minutes, and then glue out to get glue;

[0044] Wherein, the ceramic powder includes the following raw materials in parts by weight: 52 parts of kaolinite, 11 parts of ethanol, 2 parts of sodium dodecylsulfonate, 0.2 part of ammonium nitrate, and 0.2 part of potassium dihydrogen phosphate.

[0045] The prepara...

Embodiment 2

[0054] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0055] a. According to the weight ratio, take 38 parts of polylactic acid and 10 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 94 ° C, then add 28 parts of soybean protein isolate, and stir for 190 minutes;

[0056] Wherein, the mass fraction of formic acid solution is 80%.

[0057] b. Cool down to 72°C, add 10 parts of polyvinyl alcohol and 0.8 parts of manganese acetate, then pass in nitrogen, then raise the temperature to 120°C for 90 minutes, then cool down to 82°C;

[0058] c. Keep the temperature at 82°C, add 24 parts of ceramic powder, stir for 28 minutes, and then glue out to get glue;

[0059] Wherein, the ceramic powder includes the following raw materials by weight: 72 parts of kaolinite, 20 parts of ethanol, 4 parts of sodium dodecylsulfonate, 1.6 parts of ammonium nitrate, and 1.1 parts of potassium dihydrogen phosphate.

...

Embodiment 3

[0069] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0070] a. According to the weight ratio, take 33 parts of polylactic acid and 8.5 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 88 ° C, then add 15 parts of soybean protein isolate, and stir for 160 minutes;

[0071] Wherein, the mass fraction of formic acid solution is 43%.

[0072] b. Cool down to 55°C, add 5.5 parts of polyvinyl alcohol and 0.4 parts of manganese acetate, then pass in nitrogen, then raise the temperature to 102°C for 70 minutes, then cool down to 65°C;

[0073] c. Keep the temperature at 65°C, add 17 parts of ceramic powder, stir for 16 minutes, and then glue out to get glue;

[0074] Wherein, the ceramic powder includes the following raw materials in parts by weight: 57 parts of kaolinite, 13 parts of ethanol, 2.4 parts of sodium dodecylsulfonate, 0.5 part of ammonium nitrate, and 0.4 part of potassium dihydrogen ph...

[0001]

Technical field

[0002] The invention relates to the technical field of wastewater purification technology, in particular to a biofilm for wastewater treatment and a preparation method thereof.

[0003]

Background technique

[0004] Industrial wastewater often contains a large amount of organic pollutants, which need to be purified before being discharged into the sewer. Refractory organic substances such as 1,4-dioxane and dioxin are difficult to deal with. If the degradation is not complete, it will harm animals and plants. cause great harm to the environment. At present, the treatment technologies for industrial wastewater include absorption, adsorption, incineration, catalytic and biological treatment technologies. Among them, biological treatment technology includes biological filtration, biological trickling filtration and biological washing technology, etc., which have the advantages of good treatment effect, no secondary pollution, low investment and operat...

Examples

Embodiment 1

[0039] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0040] a. According to the weight ratio, take 20 parts of polylactic acid and 4 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 87 ° C, then add 10 parts of soybean protein isolate, and stir for 150 minutes;

[0041] Wherein, the mass fraction of formic acid solution is 30%.

[0042] b. Cool down to 50°C, add 4 parts of polyvinyl alcohol and 0.2 parts of manganese acetate, then raise the temperature to 96°C for 64 minutes, then cool down to 60°C;

[0043] c. Keep the temperature at 60°C, add 14 parts of ceramic powder, stir for 12 minutes, and then glue out to get glue;

[0044] Wherein, the ceramic powder includes the following raw materials in parts by weight: 52 parts of kaolinite, 11 parts of ethanol, 2 parts of sodium dodecylsulfonate, 0.2 part of ammonium nitrate, and 0.2 part of potassium dihydrogen phosphate.

[0045] The prepara...

Embodiment 2

[0054] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0055] a. According to the weight ratio, take 38 parts of polylactic acid and 10 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 94 ° C, then add 28 parts of soybean protein isolate, and stir for 190 minutes;

[0056] Wherein, the mass fraction of formic acid solution is 80%.

[0057] b. Cool down to 72°C, add 10 parts of polyvinyl alcohol and 0.8 parts of manganese acetate, then pass in nitrogen, then raise the temperature to 120°C for 90 minutes, then cool down to 82°C;

[0058] c. Keep the temperature at 82°C, add 24 parts of ceramic powder, stir for 28 minutes, and then glue out to get glue;

[0059] Wherein, the ceramic powder includes the following raw materials by weight: 72 parts of kaolinite, 20 parts of ethanol, 4 parts of sodium dodecylsulfonate, 1.6 parts of ammonium nitrate, and 1.1 parts of potassium dihydrogen phosphate.

...

Embodiment 3

[0069] A method for preparing biofilm for wastewater treatment, comprising the following steps:

[0070] a. According to the weight ratio, take 33 parts of polylactic acid and 8.5 parts of formic acid solution, add them to the reaction kettle, stir evenly, then heat to 88 ° C, then add 15 parts of soybean protein isolate, and stir for 160 minutes;

[0071] Wherein, the mass fraction of formic acid solution is 43%.

[0072] b. Cool down to 55°C, add 5.5 parts of polyvinyl alcohol and 0.4 parts of manganese acetate, then pass in nitrogen, then raise the temperature to 102°C for 70 minutes, then cool down to 65°C;

[0073] c. Keep the temperature at 65°C, add 17 parts of ceramic powder, stir for 16 minutes, and then glue out to get glue;

[0074] Wherein, the ceramic powder includes the following raw materials in parts by weight: 57 parts of kaolinite, 13 parts of ethanol, 2.4 parts of sodium dodecylsulfonate, 0.5 part of ammonium nitrate, and 0.4 part of potassium dihydrogen ph...

Images