US4043904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water treatment method
Assignee: Kao Corp
•
Filing: 1976-08-17
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Granted: 1977-08-23
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Expires: 1996-08-17
Abstract
Abstract A waste water treatment method for treating waste waters containing a surface active agent comprising a condensate obtained by condensing, with formaldehyde, a sulfonated organic compound such as an aromatic compound, a fused benzene ring compound or a hetero compound, in which a flocculation treatment is combined with an active carbon treatment.
Inventors
- 👤 Tsuneshi Takeda
- 👤 Yasuyuki Atarashi
- 👤 Akira Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/28; C02F1/283
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A process for treating waste water containing from 1 to 1000 ppm of water-soluble salts of condensates obtained by condensing, with formaldehyde, sulfonates of mono or fused polycyclic benzenoid aromatic hydrocarbons having from 1 to 12 benzene rings, which comprises the sequence of steps of: (1) adding to said waste water from 50 to 1000 ppm of at least one inorganic flocculating agent while maintaining the pH of the waste water at from about 6.5 to about 8.5 to form flocs containing a portion of said condensates and removing the resulting flocs from the waste water, and then (2) adding to the treated waste water product from step (1) from 50 to 400 ppm of activated carbon and agitating same therein for a period of time effective to absorb the condensate into the activated carbon and then filtering the activated carbon from the waste water.
Claim 2
Dependent Claim
145 words
A process for treating waste water containing from 1 to 1000 ppm of water-soluble salts of condensates obtained by condensing, with formaldehyde, sulfonates of mono or fused polycyclic benzenoid aromatic hydrocarbons having from 1 to 12 benzene rings, which comprises the sequence of steps of: (1) adding to said waste water from 50 to 1000 ppm of at least one inorganic flocculating agent while maintaining the pH of the waste water at from about 6.5 to about 8.5 to form flocs containing a portion of said condensates and removing the resulting flocs from the waste water, and then (2) adding to the treated waste water product from step (1) from 50 to 400 ppm of activated carbon and agitating same therein for a period of time effective to absorb the condensate into the activated carbon and then filtering the activated carbon from the waste water.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1 in which in step (1) there is also added to the waste water from 1 to 10 ppm of a polymeric flocculating agent.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 in which the condensate is a condensate of sodium naphthalene sulfonate.
References Cited (Backward Citations)
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Cited
US3398092A
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US3259568A
Cited
US3274104A
Cited
US3635817A
Cited
US3658697A
Cited
US3699039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |