Self flocculating separation medium and method

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/52 (2006.01) B01D 21/00 (2006.01) B01J 20/00 (2006.01) C02F 1/54 (2006.01)

Patent

CA 2211539

Disclosed is a combined flocculating and clarifying medium for flocculating and separating solid particles from waste water comprising a mixture of solid filtering or aggregating particles and a dry flocculating agent effective to flocculate the solid particles to form larger and heavier aggregates with the filtering or aggregating particles in the waste water and filtering or gravity separating the formed aggregate from the waste water. Preferably, the filtering and aggregating particles are silicious particles, such as rice hull ash, diatomaceous earth, and perlite. The flocculating and clarifying medium can be combustible or can chemically fix the aggregated solid particles in a silicious cement, which solid particles can include heavy metal particles in silicious cement.

L'invention concerne un milieu de floculation et de clarification combinées destiné à floculer et à séparer des particules solides d'eau résiduaire, comprenant un mélange de particules de filtrage ou d'agrégation solides et un agent floculant sec apte à floculer les particules solides pour former des agrégats plus gros et plus lourds avec les particules de filtrage ou d'agrégation dans l'eau résiduaire, et à filter ou à séparer par gravité l'agrégat formé de l'eau résiduaire. Les particules de filtrage et d'agrégation sont de préférence des particules siliceuses, telles que la cendre d'écorce de riz, la terre à diamotées, et la perlite. Le milieu floculant et clarifiant peut être combustible ou peut fixer chimiquement les particules solides agrégées dans un ciment siliceux, lesquelles particules solides peuvent comporter des particules de métal lourd dans du ciment siliceux.

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