US4363733A
Expired / Lapsed
US
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Process for water treatment by flocculation
Assignee: Rhone Poulenc Industries SA
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Filing: 1980-09-17
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Granted: 1982-12-14
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Expires: 2000-09-17
Abstract
Abstract A water treatment process is provided wherein water of a pH in the range of about 6 to 9 is treated with a flocculating agent, most preferably, an iron or aluminum comprising flocculating agent, and a flocculation additive comprising a heteropolysaccharide generated by the action of bacteria of the genus Xanthomonas or Arthrobacter, or fungi of the genus Sclerotium. The flocculating agent is added initially to the water, with the heteropolysaccharide comprising flocculation additive being added subsequent thereto. The process finds particular utility in the purification of potable waters.
Inventors
- 👤 Francois Meiller
- 👤 Yannick Le Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:25
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C02F1/5236
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
65 words
A process for the treatment of water comprising sequentially adding to water having a pH in the range of about 6 to about 9 first (i) an iron-containing or aluminum-containing flocculating agent, and then (ii) a flocculation additive comprising a heteropolysaccharide obtained by the fermentation of a carbohydrate via the action of bacteria of the genus Xanthomonas or Arthrobacter, or fungi of the genus Sclerotium.
Claim 2
Dependent Claim
65 words
A process for the treatment of water comprising sequentially adding to water having a pH in the range of about 6 to about 9 first (i) an iron-containing or aluminum-containing flocculating agent, and then (ii) a flocculation additive comprising a heteropolysaccharide obtained by the fermentation of a carbohydrate via the action of bacteria of the genus Xanthomonas or Arthrobacter, or fungi of the genus Sclerotium.
Claim 3
Dependent Claim
27 words
The process as defined in claim 1 wherein the heteropolysaccharide is obtained by the fermentation of a carbohydrate under the action of bacteria of the genus Xanthomonas.
Claim 4
Dependent Claim
64 words
The process as defined in claim 1 wherein the species of bacterium or fungus employed in the fermentation of the carbohydrate to provide the heteropolysaccharide of the flocculation additive is selected from the group consisting of Xanthomonas begoniae, Xanthomonas campestris, Xanthomonas carotae, Xanthomonas hederae, Xanthomonas incanae, Xanthomonas malvacearum, Xanthomonas papavericola, Xanthomonas phaseoli, Xanthomonas pisi, Xanthomonas vasculorum, Xanthomonas vseicatoria, Xanthomonas vitians, Xanthomonas pekargonii, Xanthomonas pelargonii.
Claim 5
Dependent Claim
26 words
The process as defined by claim 3 wherein the species is selected from the group consisting of Xanthomonas begoniae, Xanthomonas campestris, Xanthomonas incanae and Xanthomonas pisi.
Claim 6
Dependent Claim
13 words
The process as defined by claim 3 wherein the species is Xanthomonas campestris.
Claim 7
Dependent Claim
21 words
The process of claim 1 further comprising the simultaneous addition with the flocculating agent of a salt soluble in the medium.
Claim 8
Dependent Claim
30 words
The process of claim 6 wherein said soluble salt is a salt of a metal selected from the group consisting of a Group IIa metal, aluminum, zinc, copper and manganese.
Claim 9
Dependent Claim
21 words
The process as defined in claim 6 wherein the salt is the chloride, nitrate or acetate salt of magnesium or aluminum.
Claim 10
Dependent Claim
30 words
The process as defined by claim 1 wherein the carbohydrate fermented is selected from the group consisting of glucose, saccharose, fructose, maltose, lactose, soluble starch, corn starch, and potato starch.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the flocculation additive comprises a heteropolysaccharide comprising raw fermented wort.
Claim 12
Dependent Claim
13 words
The process of claim 1 wherein the flocculation additive comprises an isolated heteropolysaccharide.
Claim 13
Dependent Claim
23 words
The process of claim 1 wherein the flocculation additive is added from about 1 to about 5 minutes subsequent to the flocculating agent.
Claim 14
Dependent Claim
24 words
The process of claim 1 wherein the flocculation additive is added over a period of time ranging from about 1 to about 2 minutes.
Claim 15
Dependent Claim
36 words
The process of claim 1 wherein the amount of flocculation additive employed is of such amount that effectively from 0.3 to 1 g of heteropolysaccharide is added for every m 3 of water to be treated.
Claim 16
Dependent Claim
35 words
The process as defined in claim 1 wherein the species of bacterium or fungus employed in the fermentation of the carbohydrate to provide the heteropolysaccharide of the flocculation additive is arthrobacter stabilis or Arthrobacter viscosus.
Claim 17
Dependent Claim
35 words
The process as defined in claim 1 wherein the species of bacterium or fungus employed in the fermentation of the carbohydrate to provide the heteropolysaccharide of the flocculation additive is Sclerotium glucanicum or Sclerotium rolfii.
Claim 18
Dependent Claim
16 words
The process as defined in claim 1 wherein the flocculating agent comprises an aluminum-containing flocculating agent.
Claim 19
Dependent Claim
15 words
The process as defined in claim 17 wherein the aluminum-containing flocculating agent comprises aluminum sulfate.
Claim 20
Dependent Claim
15 words
The process as defined in claim 17 wherein the aluminum-containing flocculating agent comprises aluminum hydroxychloride.
Claim 21
Dependent Claim
15 words
The process as defined in claim 17 wherein the aluminum-containing flocculating agent comprises aluminum chloride.
Claim 22
Dependent Claim
16 words
The process as defined in claim 1 wherein the flocculating agent comprises an iron-containing flocculating agent.
Claim 23
Dependent Claim
15 words
The process as defined in claim 21 wherein the iron-containing flocculating agent comprises ferric chloride.
Claim 24
Dependent Claim
15 words
The process as defined in claim 21 wherein the iron-containing flocculating agent comprises ferric chlorosulfate.
Claim 25
Dependent Claim
20 words
The process as defined in claim 1 wherein the flocculating agent is a mixture comprising iron-containing and aluminum-containing flocculating agents.
Claim 26
Dependent Claim
20 words
The process as defined in claim 24 wherein the flocculating agent is a mixture comprising ferric chlorosulfate and aluminum sulfate.
Claim 27
Dependent Claim
39 words
The process as defined in claim 1 wherein the flocculating agent comprises aluminum sulfate, and the species of bacterium or fungus employed in the fermentation of the carbohydrate to provide the heteropolysaccharide of the flocculation additive is Xanthomonas campestris.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |