Methods and apparatus for reducing nitrate demands in the...

Details Methods and apparatus for reducing nitrate demands in the... Methods and apparatus for reducing nitrate demands in the...

C - Chemistry, Metallurgy

02

F

C02F 1/66 (2006.01) C02F 1/60 (2006.01) C02F 3/00 (2006.01)

Patent

CA 2517820

A method and apparatus for treating wastewater streams by adding, either separately or as a mixture, a nitrate containing compound and an alkaline material in an amount sufficient to achieve a lower concentration of atmospheric hydrogen sulfide and dissolved sulfides downstream of the addition as compared to the atmospheric hydrogen sulfide and dissolved sulfides present in the wastewater stream prior to the addition. By adding alkaline material in addition to a nitrate containing compounds, the amount of nitrate containing compound added can be reduced by at least 10% as compared to the amount of nitrate that would theoretically need to be added in the absence of alkaline material to achieve a comparable lower concentration of atmospheric hydrogen sulfide and dissolved sulfides in the wastewater stream.

L'invention concerne un procédé et un dispositif destinés au traitement des eaux usées. Ce procédé consiste à ajouter, soit séparément soit en mélange, un composé contenant des nitrates et une substance alcaline en quantité suffisante pour obtenir une concentration de sulfure d'hydrogène atmosphérique et de dépôts sulfurés dissous plus faible en aval qu'en amont du point où sont ajoutés le composé contenant des nitrates et la substance alcaline. L'ajout d'une substance alcaline en plus de composés contenant des nitrates permet de réduire d'au moins 10 % la quantité de composé contenant des nitrates ajoutée par rapport à la quantité de nitrate qu'il serait théoriquement nécessaire d'ajouter en l'absence de substance alcaline pour obtenir une réduction de la concentration comparable du sulfure d'hydrogène atmosphérique et des dépôts sulfurés dissous dans les eaux usées.

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