Paques B.v.

Paques Bio Systems B.v.

Biostar Development C.v.

Cees J Buisman

Hendrik Dijkman

Petrus Leonardus Verbraak

Adrianus Johannes Den Hartog

Albert Joseph Janssen

Wiebe Ruurd Abma

Dimitri Yuri Sorokin

Gerrit Van Straten

Lesley Anna Robertson

Jan Bontsema

Johannes Gijsbrecht Kuenen

Albert Jozef Janssen

Gatze Lettinga

Joannes Gijsbrecht Kuenen

Jolyn Martha De Zwart

Process for the purification of gases containing hydrogen sulphide

Biological treatment of spent caustics

The invention provides a process for removing polyamine chelating agents from aqueous solutions comprising oxidising the chelating agents with oxygen in the presence of an equivalent amount of a transition metal such as iron, followed by biologically reducing the chelates in the presence of an electron donor, and optionally by membrane filtration. The biological reduction is carried out with denitrifying and/or sulphate-reducing bacteria.

Process for removing polyamine chelating agents form aqueous solutions

Process for the treatment of gases

Process for purifying flue gas containing nitrogen oxides

Process for purifying sulphide-containing waste water

Process for removing sulphur compounds from water

Method for removing sulphur compounds from water

A process is provided for the treatment of water containing sulphide wherein the sulphide is oxidized in an aerobic reactor having a minimum sulphide sludge load. The minimum sulphide load is at least 10 mg of sulphide per mg of the nitrogen present in the sludge per hour, the sludge load being calculated on the basis of the sulphide oxidizing part of the biomass. The minimum sulphide load may also be defined as 25 mg of sulphide per liter of reactor material per hour. The sulphide can be largely oxidized to elemental sulphur which is then separated and reused. Waste water also containing organic matter in addition to varying levels of sulphide is purified without interference of filamentous bacteria using a two-step aerobic process. The process for sulphide removal can be used for the treatment of waste water having high levels of sulphur compounds such as sulphate, sulphite and thiosulphate by first reducing these sulphur compounds in an aerobic step. Heavy metals are removed from water by adding sulphide to the water and precipitating the metals as sulphides; the sulphide can be added by reducing sulphur compounds already present.

Process for the treatment of water containing sulphur compounds

Process for the removal of sulphur compounds from gases

The invention provides a process for the removal of sulfur dioxide from waste gas, comprising the steps of:

Process for the removal of sulfur dioxide from waste gas

Growing community of inventors

Harich, Netherlands

Cees J Buisman