초록

This invention provides a process for the biotreatment of wastewater from pulping industries. Sulfides are removed by a number of strains of bacteria from the genus Thiobacillus or Thiobacillus denitrificans.

대표청구항 ▼

[ What is claimed as invention is:] [1.] A process for biologically treating wastewater containing sulfides of such concentration that sulfides of an objectionable odor are generated into the atmosphere, the process reducing concentration of said sulfides in the wastewater and in the atmosphere and

[ What is claimed as invention is:] [1.] A process for biologically treating wastewater containing sulfides of such concentration that sulfides of an objectionable odor are generated into the atmosphere, the process reducing concentration of said sulfides in the wastewater and in the atmosphere and reducing formation of sulfuric acid from sulfur, said process comprising:(a) as a first source of bacteria, applying a number of strains of bacteria from the genus Thiobacillus to the wastewater to minimize sulfide content of the wastewater by converting sulfides to sulfur incorporated in the biomass of the Thiobacillus; and(b) as a second source of bacteria, additionally applying a co-cultural blend, the blend formed by at least one of the number of strains of bacteria from the genus Thiobacillus with at least one heterotroph, to the wastewater, the blend able to grow under reduced oxygen conditions, to convert sulfides to sulfur incorporated in the biomass of the Thiobacillus and to minimize chemical oxygen demand and biological oxygen demand of the wastewater.