Method for producing biochemical humic acid through microbial fermentation of furfural residue

Abstract

The invention relates to a method used for producing biochemical humic acid, and especially relates to a method used for producing biochemical humic acid through microbial fermentation of furfural residue. The method is characterized in that the method comprises the steps that: a, tower bottom wastewater in furfural production is added into furfural residue, such that water content in furfural residue is regulated; b, carbon nitrogen ratio of the furfural residue is regulated by using urea and wheat bran; bacterium powder is uniformly blended into the furfural residue, and a mass ratio of the furfural residue and the bacterium powder is controlled; the mixture is stacked into a fermentation tank, and is fermented; an alkaline solution is added to the fermented furfural residue, and the mixture is stood under normal temperature; three-stage sedimentation is carried out, such that a clarified supernatant is obtained; hydrochloric acid is added to the supernatant, such that the pH value is regulated; when humic acid is precipitated, the supernatant is filtered, and the precipitate is washed by using distilled water; the precipitate is dried in a spray drier, such that humic acid is obtained. The method provided by the invention is unique. With the method, environment pollution is reduced. According to the invention, humic acid content in furfural residue is improved through microbial fermentation, and biochemical humic acid is prepared from fermented furfural residue.

Description

Technical field

[0001] The invention relates to a method for biochemically producing humic acid, in particular to a method for biochemically producing humic acid by microbial fermentation of furfural residue. Background technique

[0002] The furfural industry in my country consumes 11-12 tons of corncobs to produce 1 ton of furfural, and discharges 10-11 tons of furfural residue. The pH value is 2-3. It not only contains a certain amount of N, P, K, Zn, Mg, Fe and other elements, but also Contains a lot of organic matter, the content can reach more than 90%, of which the humic acid content reaches 20%. At present, most furfural residues from furfural plants in China are used as boiler fuel. Taking the annual output of 5,000 tons of furfural as an example, the annual output of furfural residue is 60,000 tons. In addition to burning 30,000 tons, there is still a large amount of remaining furfural residue that is difficult to handle, causing great pollution to the environment. [00...

Examples

Embodiment 1

[0022] a. Add the bottom waste water produced by furfural to the furfural residue and adjust the moisture content of the furfural residue to 50%;

[0023] b. Use urea and bran to adjust the C / N ratio of furfural residue to 30:1;

[0024] c. Stir the HM bacterial powder evenly into the furfural residue, control the mass ratio of the furfural residue to the bacterial powder to be 20000:1, pile it into the fermentation tank, ferment for 75 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue increased by 114%;

[0025] d. Add NaOH solution with a mass concentration of 2% to the fermented furfural residue, the mass ratio of the fermented furfural residue to the NaOH solution is 1:7, and let it stand at room temperature;

[0026] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a second-stage sedimentat...

Embodiment 2

[0029] a. Add the bottom wastewater of furfural production to the furfural residue, adjust the moisture content of the furfural residue to 65%.

[0030] b. Adjust the carbon to nitrogen ratio (C / N) of furfural residue to 25:1 with ammonium bisulfate and bran.

[0031] c. Stir the BM bacteria powder into the furfural residue evenly, control the mass ratio of the furfural residue and the bacteria powder to 10000:1, pile into the fermentation tank, ferment for 90 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue is increased by 150%.

[0032] d. Add a KOH solution with a mass concentration of 1% to the furfural residue, and the mass ratio of the fermented furfural residue to the KOH solution is 1:5, and let it stand at room temperature.

[0033] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a se...

Embodiment 3

[0036] a. Add the bottom waste water from furfural production to the furfural residue and adjust the moisture content of the furfural residue to 60%.

[0037] b. Adjust the carbon to nitrogen ratio (C / N) of furfural residue to 27:1 with ammonium sulfate and bran.

[0038] c. Stir EM bacteria powder into furfural residue evenly, control the mass ratio of furfural residue to bacteria powder to 2000:1, pile into the fermentation tank, ferment for 60 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue is increased by 70%.

[0039] d. Add 4% NH to the furfural residue 3 ??H 2 O solution, fermented furfural residue and NH 3 ??H 2 The mass ratio of O solution is 1:10, and it is allowed to stand at room temperature.

[0040] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a second-stage sedimentation. Af...

Technical field

[0001] The invention relates to a method for biochemically producing humic acid, in particular to a method for biochemically producing humic acid by microbial fermentation of furfural residue. Background technique

[0002] The furfural industry in my country consumes 11-12 tons of corncobs to produce 1 ton of furfural, and discharges 10-11 tons of furfural residue. The pH value is 2-3. It not only contains a certain amount of N, P, K, Zn, Mg, Fe and other elements, but also Contains a lot of organic matter, the content can reach more than 90%, of which the humic acid content reaches 20%. At present, most furfural residues from furfural plants in China are used as boiler fuel. Taking the annual output of 5,000 tons of furfural as an example, the annual output of furfural residue is 60,000 tons. In addition to burning 30,000 tons, there is still a large amount of remaining furfural residue that is difficult to handle, causing great pollution to the environment. [00...

Examples

Embodiment 1

[0022] a. Add the bottom waste water produced by furfural to the furfural residue and adjust the moisture content of the furfural residue to 50%;

[0023] b. Use urea and bran to adjust the C / N ratio of furfural residue to 30:1;

[0024] c. Stir the HM bacterial powder evenly into the furfural residue, control the mass ratio of the furfural residue to the bacterial powder to be 20000:1, pile it into the fermentation tank, ferment for 75 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue increased by 114%;

[0025] d. Add NaOH solution with a mass concentration of 2% to the fermented furfural residue, the mass ratio of the fermented furfural residue to the NaOH solution is 1:7, and let it stand at room temperature;

[0026] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a second-stage sedimentat...

Embodiment 2

[0029] a. Add the bottom wastewater of furfural production to the furfural residue, adjust the moisture content of the furfural residue to 65%.

[0030] b. Adjust the carbon to nitrogen ratio (C / N) of furfural residue to 25:1 with ammonium bisulfate and bran.

[0031] c. Stir the BM bacteria powder into the furfural residue evenly, control the mass ratio of the furfural residue and the bacteria powder to 10000:1, pile into the fermentation tank, ferment for 90 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue is increased by 150%.

[0032] d. Add a KOH solution with a mass concentration of 1% to the furfural residue, and the mass ratio of the fermented furfural residue to the KOH solution is 1:5, and let it stand at room temperature.

[0033] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a se...

Embodiment 3

[0036] a. Add the bottom waste water from furfural production to the furfural residue and adjust the moisture content of the furfural residue to 60%.

[0037] b. Adjust the carbon to nitrogen ratio (C / N) of furfural residue to 27:1 with ammonium sulfate and bran.

[0038] c. Stir EM bacteria powder into furfural residue evenly, control the mass ratio of furfural residue to bacteria powder to 2000:1, pile into the fermentation tank, ferment for 60 days, control the fermentation temperature not to exceed 60°C, after fermentation, The content of humic acid in furfural residue is increased by 70%.

[0039] d. Add 4% NH to the furfural residue 3 ??H 2 O solution, fermented furfural residue and NH 3 ??H 2 The mass ratio of O solution is 1:10, and it is allowed to stand at room temperature.

[0040] e. In order to separate the slag liquid, perform three-stage sedimentation. The first-stage sedimentation is 24 hours, and the upper layer liquid is subjected to a second-stage sedimentation. Af...