US4707270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating waste water containing phosphorus compounds and/or organic cod substances
Assignee: Ube Corp
•
Filing: 1986-01-31
•
Granted: 1987-11-17
•
Expires: 2006-01-31
Abstract
Abstract The specification discloses a novel calcium silicate water-treating agent exhibiting a superior ability to remove various kinds of phosphorus compounds or other environmental pollutants contained in wastewater, the calcium silicate water treating agent comprising a burned product which is prepared by burning a mixture containing as main constituents calcium compound, thermally decomposable to calcium oxide (CaO), and SiO 2 -containing compound at a temperature of 1300° to 1600° C., the molar ratio of CaO/SiO 2 of the resultant burned product being in the range of 1.5 to 5.0, preferably 2.0 to 4.0. In this water treating agent, SiO 2 component may be partially replaced by Al 2 O 3 and/or Fe 2 O 3 . A further water treating agent is prepared by heating the hydrate of the burned product prepared above at a temperature of 50° to 700° C. By using the thus obtained water treating agents, water treatment can be carried out with a high efficiency, thereby the treatment time, labor and cost can be considerably saved.
Inventors
- 👤 Waichi Kobayashi
- 👤 Koji Usui
- 👤 Kozo Hirosawa
- 👤 Tetsuya Sadatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:41
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; C02F2101/00; C02F2101/10; C02F2101/105; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
128 words
A process for teating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which consists essentially of: contacting said waste water with particles of a calcium silicate treating agent consisting of a burned product which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture consisting of a calcium compound which is thermally decomposed to form CaO at said temperature and a SiO 2 -containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0; adsorbing said phosphorus compounds and/or said pollutants on the surfaces of the particles of said treating agent; and then separating from the water, said treating agent together with the phosphorus compounds and/or pollutants that are adsorbed thereon.
Claim 2
Dependent Claim
128 words
A process for teating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which consists essentially of: contacting said waste water with particles of a calcium silicate treating agent consisting of a burned product which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture consisting of a calcium compound which is thermally decomposed to form CaO at said temperature and a SiO 2 -containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0; adsorbing said phosphorus compounds and/or said pollutants on the surfaces of the particles of said treating agent; and then separating from the water, said treating agent together with the phosphorus compounds and/or pollutants that are adsorbed thereon.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 in which said treating agent consists essentially of Ca 3 SiO 5 and Ca 2 SiO 4 .
Claim 4
Dependent Claim
44 words
A process as claimed in claim 1 in which said treating agent is mixed with said waste water and the amount of said treating agent added to said waste water is sufficient to raise the pH of said waste water to 10.3 or higher.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 in which said molar ratio of CaO/SiO 2 is in the range of from 2.0 to 4.0.
Claim 6
Dependent Claim
49 words
A process as claimed in claim 1 in which the total amount of said treating agent that is added to said waste water is divided into from two to four separate parts, and which comprises separately adding each of said parts to said waste water at spaced time intervals.
Claim 7
Dependent Claim
48 words
A process as claimed in claim 1 in which the ratio of the total amount of said treating agent that is added to said waste water to the amount of the phosphorus compounds, calculated as PO 4 3- , in the waste water is from 6/1 to 60/1.
Claim 8
Dependent Claim
155 words
A process for treating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which comprises; contacting said waste water with particles of a calcium silicate treating agent and an auxiliary treating agent selected from the group consisting of water-soluble alkali metal halides and water-soluble alkaline earth metal halides, said calcium silicate treating agent consisting of a burned product which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture of a calcium compound which is thermally decomposed to form CaO at said temperature, and a SiO 2 containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0; adsorbing said phosphorus compounds and/or said pollutants on the surfaces of the particles of said calcium silicate treating agent; and then separating from the water, said calcium silicate treating agents together with the phosphorus compounds and/or pollutants that are adsorbed thereon.
Claim 9
Dependent Claim
155 words
A process for treating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which comprises; contacting said waste water with particles of a calcium silicate treating agent and an auxiliary treating agent selected from the group consisting of water-soluble alkali metal halides and water-soluble alkaline earth metal halides, said calcium silicate treating agent consisting of a burned product which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture of a calcium compound which is thermally decomposed to form CaO at said temperature, and a SiO 2 containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0; adsorbing said phosphorus compounds and/or said pollutants on the surfaces of the particles of said calcium silicate treating agent; and then separating from the water, said calcium silicate treating agents together with the phosphorus compounds and/or pollutants that are adsorbed thereon.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 7, in which said calcium silicate treating agent consists essentially of Ca 3 SiO 5 and Ca 2 SiO 4 .
Claim 11
Dependent Claim
48 words
A process as claimed in claim 7 in which said treating agents are mixed with said waste water and the amount of said calcium silicate treating agent that is added to said waste water is sufficient to raise the pH of said waste water to 10.3 or higher.
Claim 12
Dependent Claim
30 words
A process as claimed in claim 7 in which said molar ratio of CaO/SiO 2 is said calcium silicate treating agent is in the range of from 2.0 to 4.0.
Claim 13
Dependent Claim
51 words
A process as claimed in claim 7 in which the total amount of said calcium silicate treating agent that is added to said waste water is divided into from two to four separate parts, and which comprises separately adding each of said parts to said waste water at spaced time intervals.
Claim 14
Dependent Claim
50 words
A process as claimed in claim 7 in which the ratio of the total amount of said calcium silicate treating agent that is added to said waste water to the amount of the phosphorus compounds, calculated as PO 4 3- , in the waste water is from 6/1 to 60/1.
Claim 15
Dependent Claim
29 words
A process as claimed in claim 7 in which the process consists of contacting said waste water with only said calcium silicate treating agent and said auxiliary treating agent.
Claim 16
Dependent Claim
49 words
A process as claimed in claim 7 in which said auxiliary treating agent is at least one compound selected from the group consisting of potassium flouride, sodium flouride, photasium chloride, sodium chloride, magnesium chloride, calcium chloride, barium chloride, potassium bromide, sodium bromide, calcium bromide, barium bromide and calcium iodide.
Claim 17
Dependent Claim
141 words
A process for treating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which comprises; contacting said waste water with a hydrated calcium silicate treating agent which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture comprising a calcium compound which is thermally decomposed to form CaO at said temperature and a SiO 2 -containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0, then hydrating said burned product to increase the specific surface area thereof and then aging said hydrated product by heating the hydrated product at a temperature of 50° to 700° C.; adsorbing said phosphorus compounds and/or said pollutants on said treating agent; and then separating from the water, said treating agent together with the adsorbed phosphorus compounds and/or pollutants.
Claim 18
Dependent Claim
141 words
A process for treating waste water containing phosphorus compounds and/or organic oxidizable pollutants, which comprises; contacting said waste water with a hydrated calcium silicate treating agent which has been prepared by burning, at a temperature of from 1300° to 1600° C., a mixture comprising a calcium compound which is thermally decomposed to form CaO at said temperature and a SiO 2 -containing compound, the molar ratio of CaO/SiO 2 in said burned product being in the range of from 1.5 to 5.0, then hydrating said burned product to increase the specific surface area thereof and then aging said hydrated product by heating the hydrated product at a temperature of 50° to 700° C.; adsorbing said phosphorus compounds and/or said pollutants on said treating agent; and then separating from the water, said treating agent together with the adsorbed phosphorus compounds and/or pollutants.
Claim 19
Dependent Claim
23 words
A process as claimed in claim 15 in which said treating agent consists essentially of CaSiO 5 and Ca 2 SiO 4 .
Claim 20
Dependent Claim
24 words
A process as claimed in claim 15 in which the burned product also contains Al 2 O 3 and/or Fe 2 O 3 .
Claim 21
Dependent Claim
46 words
A process as claimed in claim 15 in which said treating agent is mixed with said waste water and the amount of said treating agent that is added to said waste water is sufficient to raise the pH of said waste water to 10.3 or higher.
Claim 22
Dependent Claim
24 words
A process as claimed in claim 15 in which said molar ratio of CaO/SiO 2 is in the range of from 2.0 to 4.0.
Claim 23
Dependent Claim
47 words
A process as claimed in claim 15 in which the total amount of said treating agent that is added to said waste water is divided into from two to four separate parts, each of said parts is separately added to said waste water at spaced time intervals.
Claim 24
Dependent Claim
48 words
A process as claimed in claim 15 in which the ratio of the total amount of said treating agent that is added to said waste water to the amount of the phosphorus compounds, calculated as PO 4 3- , in the waste water is from 12.5/1 to 75/1.
Claim 25
Dependent Claim
40 words
A process as claimed in claim 15 in which at least one auxiliary agent selected from the group consisting of water-soluble alkali metal halides and water-soluble alkaline earth metal halides is added together with said hydrated calcium silicate treating agent.
Claim 26
Dependent Claim
55 words
The process as claimed in claim 15 in which at least one auxiliary agent selected from the group consisting of potassium fluoride, sodium fluoride, potassium chloride, sodium chloride, magnesium chloride, calcium chloride, barium chloride, potassium bromide, sodium bromide, calcium bromide, barium bromide and calcium iodide is added together with said hydrated calcium silicate treating agent.
Claim 27
Dependent Claim
66 words
A process as claimed in claim 15 in which said burned product is hydrated by immersing said burned product in hydration water at from 15° to 70° for at least 30 minutes, wherein the amount of said hydration water is from 1 to 7 times the weight of said burned product, then separating the hydrated product from said hydration water and then aging said hydrated product.
Claim 28
Dependent Claim
49 words
A process as claimed in claim 15 in which the ratio of the total amount of said treating agent that is added to said waste water to the amount of said organic oxidizable pollutants, based on the COD value thereof measured using potassium permanganate is from 5 to 110.
References Cited (Backward Citations)
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JPS567681A
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JPS567680A
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JPS5615886A
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JPS5615885A
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US4402833A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |