Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-07-13
2000-10-24
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210611, 210620, 210630, 210916, 435262, C02F 330
Patent
active
061361933
ABSTRACT:
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. COD and BOD are concurrently removed with the sulfides by an improved co-cultural blend comprising co-cultures of a number of strains of the Thiobacillus or Thiobacillus denitrificans bacteria with heterotrophs. At least approximately 20%, and preferably between approximately 40% and approximately 60%, of the improved co-cultural blend comprises the co-cultures of a number of strains of the Thiobacillus or Thiobacillus denitrificans bacteria with the heterotrophs. Acclimation of the heterotrophs to the species to be removed is accomplished with biological acclimation reactors which reduce mycell toxicity for the heterotrophs. To control pH of the heterotrophic reaction with inorganic and organic sulfides, magnesium oxide (MgO) is utilized along with caustic. Ammonia and phosphate are available to the heterotrophs and to the Thiobacillus or Thiobacillus denitrificans bacteria by chemical addition.
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Shaper Sue Z.
Upton Christopher
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