Flocculation of aqueous media with novel flocculating adjuvant
AssigneeRhone-Poulenc Specialites Chimiques
InventorsYannick Le Du, Francois Meiller
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Abstract
Aqueous media, e.g., potable waters, are treated/purified by flocculation utilizing, as the flocculant therefor, that flocculating adjuvant adapted for ready dispersion/dissolution in such media comprising intimate admixture of a water soluble gum, polymer or biogum heteropolysaccharide, a dispersion/dissolution enhancing amount of a water donor material, and, advantageously, an anionic and/or nonionic surfactant.
Claims33
In a process for the treatment/purification of an aqueous medium by flocculation, the improvement which comprises, utilizing as a flocculant adjuvent therefor, that composition of matter adapted for ready dispersion/dissolution in said aqueous medium comprising intimate admixture of a water soluble gum, polymer or biogum heteropolysaccharide, and a dispersion/dissolution enhancing amount of a water donor material and water associated with said water donor said flocculant adjuvent comprising from 30 to 70% by weight of the water soluble gum, polymer or biogum heteropolysaccharide;
- from 7 to 40% by weight of the water donor;
- and from 15 to 37% by weight of water associated with said water donor.
In a process for the treatment/purification of an aqueous medium by flocculation which comprises treating/purifying said aqueous medium at a pH ranging from 6 to 9 with an iron or aluminum flocculating agent, or mixture thereof, the improvement which comprises thence treating/purifying said aqueous medium with that flocculating adjuvant adapted for ready dispersion/dissolution in said aqueous medium comprising intimate admixture of a water soluble gum, polymer or biogum heteropolysaccharide, a water donor material and water associated with said water donor material, the weight of said gum polymer or biogum heteropolysaccharide being from 6.5 to 1 times the weight of said water and the weight of said water donor material being from 0.3 to 2.6 times the weight of said water.
In a process for the treatment/purification of an aqueous medium by flocculation which comprises treating/purifying said aqueous medium at a pH ranging from 6 to 9 with an iron or aluminum flocculating agent, or mixture thereof, the improvement which comprises thence treating/purifying said aqueous medium with that flocculating adjuvant adapted for ready dispersion/dissolution in said aqueous medium comprising intimate admixture of from 30% to 70% by weight of a water soluble gum, polymer or biogum heteropolysaccharide;
- from 7 to 40% by weight of a water donor;
- from 0 to 10% by weight of an anionic or nonionic surfactant, or mixture thereof;
- and from 15 to 37% by weight of water associated with said water donor.
In a process for the treatment/purification of an aqueous medium by flocculation, the improvement which comprises utilizing as a flocculant adjuvant therefor, that composition of matter adapted for ready dispersion/dissolution in said aqueous medium comprising (i) intimate admixture of a water soluble biogum heteropolysaccharide comprising product of fermentation of a carbohydrate with bacteria of the genera Xanthomonoas or Arthrobacter, or with fungi of the genus Sclerotium (ii) a water donor material comprising a finely divided silica, a hydrated silica gel, a dehydrated silica gel, an alumina hydrate, an argilla, a natural or synthetic zeolite, or a hydrate of an inorganic salt and (iii) water associated with said water donor material, the weight of said biogum being from 6.5 to 1 times the weight of said water and the weight of water donor material being from 0.3 to 2.6 times the weight of said water.
In a process for the treatment/purification of an aqueous medium by flocculation which comprises treating/purifying said aqueous medium at a pH ranging from 6 to 9 with an iron or aluminum flocculating agent, or mixture thereof, the improvement which comprises thence treatment/purifying said aqueous medium with that flocculant adjuvant adapted for ready dispersion/dissolution in said aqueous medium comprising (i) intimate admixture of a water soluble biogum heteropolysaccharide comprising product of fermentation of a carbohydrate with bacteria of the genera Xanthomanas or Arthrobacter, or with fungi of the genus Sclerotium, (ii) a water donor material which comprises said flocculating adjuvent comprising a finely divided silica, a hydrated silica gel, a dehydrated silica gel, an alumina hydrate, an argilla, a natural or synthetic zeolite, or a hydrate of an inorganic or organic salt, and (iii) water associated with said water donor material, the weight of said biogum being from 6.5 to 1 times the weight of said water and the weight of said water donor material being from 0.3 to 2.6 times the weight of said water.
In a process for the treatment/purification of an aqueous medium by flocculation which comprises treating/purifying said aqueous medium at a pH ranging from 6 to 9 with an iron or aluminum flocculating agent, or mixture thereof, the improvement which comprises thence treating/purifying said aqueous medium with that flocculating adjuvent adapted for ready dispersion/dissolution in said aqueous medium comprising intimate admixture of from 30% to 70% by weight of a water soluble biogum heteropolysaccharide comprising product of fermentation of a carbohydrate with bacteria of the genera Xanthomonas or Anthrobacter, or with fungi of the genus Sclerotium;
- from 7 to 40% by weight of water donor material comprising a finely divided silica, a hydrated silica gel, a dehydrated silica gel, an alumina hydrate, an argilla, a natural or synthetic zeolite, or a hydrate of an inorganic or organic salt;
- from 0 to 10% by weight of an anionic or nonionic surfactant, or mixture thereof;
- and from 15 to 37% by weight of water associated with said water donor.
Dependencies are inferred from the claim text.