Yara International Asa

Marina Ettl

Wolfram Franke

Hans-Werner Breiner

Thorsten Stoeck

Günther Doppelbauer

Werner Van Borm

Tim Corben

Jan Hilmers

The present invention concerns a biochemical process for the denitrification of a hypersaline wastewater composition.

Denitrification of saline industrial waste water

The invention relates to a process and a biofilter system () for removing HS from a HS contaminated energy production gas stream containing methane. The aqueous biofilter system comprises a biofilter () having biofilter support material constituting a biofilter bed supporting a humidified biofilm having microorganisms that are capable of oxidizing HS. The process comprises the steps of contacting the HS contaminated energy production gas stream with the microorganisms of the humidified biofilm, and oxidation of at least part of the HS in the HS contaminated energy production gas stream by the microorganisms, resulting in a HS depleted energy production gas stream, wherein the process further comprises the step of adding an aqueous nitrate solution to the HS contaminated energy production gas stream prior to being contacted with the microorganisms, enabling the microorganisms to oxidize the HS under anoxic conditions. The invention furthermore relates to the use of such a biofilter system () in the removal of HS from a HS contaminated energy production gas stream containing methane.

Process and biofilter system for H2S removal from a H2S contaminated energy production gas stream containing methane and use of such a biofilter system

The present invention concerns a process for treatment of industrial waste water containing both easy biodegradable and heavy biodegradable matter wherein the process comprises the two steps of first treating the waste water in a bioreactor wherein a nitrate solution is added and secondly treating the waste water in a chemical oxidation step wherein an oxidizer, permanganate, is added.

Process to treat industrial wastewater

Growing community of inventors

Alpen-Veen, Germany

Marina Ettl