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Degrémont is a company specializing in the production of drinking water, and in the treatment of sewage and sludge. After starting as a family business in France in 1939, it has since become a subsidiary of Suez Environment, employing 4,600 people in 70 countries, and generating annual revenues of €1.520 billion . Wikipedia.


The present invention is directed to systems and methods of treating wastewater. The present invention may include a method of treating such wastewater comprising selenium in the form of water soluble selenates, selenites, and/or selenides, the method including: a chemical/biological treatment process, causing the water soluble selenates, selenites, and/or selenides in the wastewater to be converted into insoluble elemental selenium; and a physical treatment process, trapping the insoluble elemental selenium in a filtration device. Systems and methods in accordance with the present invention may also include a system for including: one or more chemical/biological treatment reactors, the one or more chemical/biological treatment reactors configured to cause the water soluble selenates, selenites, and/or selenides in the wastewater to be converted into insoluble elemental selenium; and one or more physical treatment devices, the one more physical treatment devices configured to trap the insoluble elemental selenium in a filtration device.


The invention relates to a method for washing a filter (F) having at least two layers of filtering media (


The invention is directed to systems and methods of biological and chemical treatment of wastewater comprising organic nitrogen compounds. Systems may include: an aerobic reactor, a first separation module for separating liquid and solid components of the wastewater; an oxidation module for removing organic materials from the wastewater; and a post-anoxic reactor for denitrifying at least a portion of the wastewater. Systems may include a second separation module and various feedback recycle lines between the components. Methods may include: degrading by the aerobic reactor more than 95% of organic compounds to ammonia, oxidizing by the oxidation module at least a portion of the ammonia to nitrates, and degrading by the post-anoxic reactor at least a portion of the nitrates to nitrogen gas and water. Systems and methods may reduce total organic carbon of the wastewater by more than 90%, and total nitrogen of the wastewater by more than 90%.


A process for reducing the production of sludge by municipal or industrial wastewater purification plants, comprising a step of mesophilic or thermophilic anaerobic digestion (


Process for treating effluents containing nitrogen in ammonium form, using a sequential biological reactor (

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