US3929600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of removing ammoniacal nitrogen from waste water
Assignee: Iwao Engineering Co Inc
•
Filing: 1975-04-03
•
Granted: 1975-12-30
•
Expires: 1995-04-03
Abstract
Abstract The present invention relates to a process for removing ammonia nitrogen by recycling a treating liquid as a medium in a closed system including an ion-exchange process, an adsorption process, an elution process, an electrolysis process, an adjusting process and an cleansing process to prevent secondary pollution and improve removing ability.
Inventors
- 👤 Toshihisa Hiasa
- 👤 Hirohisa Ishimard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:42
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/586
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A PROCESS FOR REMOVING AMMONIACAL NITROGEN FROM WASTER WATER BY SUBJECTING SAID WATER CONTAINING AMMONIUM IONS TO ADSORBTION ON AN ION-EXCHANGE SUBSTANCE AND ELUTING THE SAME COMPRISING PASSING AN ALKALINE ELUANT LIQUID CONTAINING ALKALI METAL CHLORIDES THROUGH THE ION-EXCHANGE SUBSTANCE TO ELUTE THE SAME, ELECTROLYZING THE LIQUID ELUATE CONTAINING THE SAID AMMONIUM IONS TO DECOMPOSE THE AMMONIUM ION BY THE OXIDIZING EFFECT OF CHLORINE THEREBY EVOLVED, DISCHARGING THE GAS GENERATED BY SAID DECOMPOSITION, ADDING TO THE ELECTROLYZED LIQUID AN ADJUSTING LIQUID WHICH CONTAINS A HYDROXIDE OF
Claim 2
Dependent Claim
86 words
A PROCESS FOR REMOVING AMMONIACAL NITROGEN FROM WASTER WATER BY SUBJECTING SAID WATER CONTAINING AMMONIUM IONS TO ADSORBTION ON AN ION-EXCHANGE SUBSTANCE AND ELUTING THE SAME COMPRISING PASSING AN ALKALINE ELUANT LIQUID CONTAINING ALKALI METAL CHLORIDES THROUGH THE ION-EXCHANGE SUBSTANCE TO ELUTE THE SAME, ELECTROLYZING THE LIQUID ELUATE CONTAINING THE SAID AMMONIUM IONS TO DECOMPOSE THE AMMONIUM ION BY THE OXIDIZING EFFECT OF CHLORINE THEREBY EVOLVED, DISCHARGING THE GAS GENERATED BY SAID DECOMPOSITION, ADDING TO THE ELECTROLYZED LIQUID AN ADJUSTING LIQUID WHICH CONTAINS A HYDROXIDE OF
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein sodium chloride solution is used as the eluant liquid and sodium hydroxide solution is used as the adjusting liquid.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein the concentration and the rate of flow of the eluant liquid are 0.1 - 6.0 N and 1.0 - 20 cv/hour, respectively.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein potassium chloride solution is used as the eluant liquid and potassium hydroxide solution is used as the adjusting liquid.
Claim 6
Dependent Claim
28 words
The process of claim 4 wherein the concentration and the rate of flow of the eluant liquid are 0.1 - 6.0 N and 1.0 - 20 cv/hour, respectively.
Claim 7
Dependent Claim
59 words
The process of claim 1 wherein the gas generated by electrolysis is first subjected to contact with the adjusting liquid to absorb its acid constituents, containing mainly chlorine and nitrogen oxides, then treated with activated carbon and discharged from the system, and the adjusted electrolyzed eluate is treated with activated carbon before recirculating the same to said ion-exchange substance.
Claim 8
Dependent Claim
25 words
The process of claim 6 wherein sodium chloride solution is used as the eluant liquid and sodium hydroxide solution is used as the adjusting liquid.
Claim 9
Dependent Claim
28 words
The process of claim 6 wherein the concentration and the rate of flow of the eluant liquid are 0.1 - 6.0 N and 1.0 - 20 cv/hour, respectively.
Claim 10
Dependent Claim
61 words
The process of claim 6 wherein the rate of flow of the generated gas is 0.5 - 1.0 m/sec; contact of the generated gas with the adjusting liquid is L/G. 1-5; contact time of the generated gas with activated carbon is for 0.2 - 4.0 sec, and that of the eluant liquid with activated carbon is for 0.2 - 3.0 min.
Claim 11
Dependent Claim
25 words
The process of claim 6 wherein potassium chloride solution is used as the eluant liquid and potassium hydroxide solution is used as the adjusting liquid.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |