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.