Nitrification and denitrification of digested biosolids

Details Nitrification and denitrification of digested biosolids Nitrification and denitrification of digested biosolids

C - Chemistry, Metallurgy

02

F

C02F 11/02 (2006.01) C02F 3/30 (2006.01)

Patent

CA 2725178

Processes and apparatus are provided for the nitrification and denitrification of digested biosolids. The rate of nitrification / denitrification is controlled by sensing the amount of oxygen or another parameter in the digested biosolids and adjusting the amount of oxygen supplied to the biosolids, such as through automated adjustment of an aeration device. To promote nitrification, the amount of oxygen available in the digested biosolids is increased. To promote denitrification, the amount of oxygen available in the digested biosolids is decreased. The processes and apparatus are well suited for reducing the concentration of am-monium in biosolids or off-gas resulting from aerobic thermophilic digestion of wastewater sludges. The processes and apparatus are well suited for reducing the dosage of chemicals required for dewatering operations of biosolids.

L'invention concerne des processus et un appareil destinés à la nitrification et à la dénitrification de biosolides digérés. Le taux de nitrification / dénitrification est régulé en détectant la quantité doxygène ou un autre paramètre dans les biosolides digérés et en réglant la quantité doxygène fournie aux biosolides, par exemple par un réglage automatique dun dispositif daération. Pour favoriser la nitrification, la quantité doxygène disponible dans les biosolides digérés est accrue. Pour favoriser la dénitrification, la quantité doxygène disponible dans les biosolides digérés est réduite. Les processus et lappareil selon linvention sont bien adaptés à la réduction de la concentration dammonium dans les biosolides ou les effluents gazeux résultant de la digestion thermophile aérobie de boues provenant deaux usées. Les processus et lappareil selon linvention sont également bien adaptés à la réduction du dosage en produits chimiques nécessaires aux opérations de déshydratation des biosolides.

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