Process of biotreating wastewater from pulping industries
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 24, 2000
Issued Date -
N/A
app pub date -
Jul 13, 1998
filing date -
Sep 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 12 Citation Count
- C02F Class
- 46.18 % this patent is cited more than
- 25 Age