CA1119782A - Wet oxidation of waste liquor - Google Patents
Wet oxidation of waste liquorInfo
- Publication number
- CA1119782A CA1119782A CA000309900A CA309900A CA1119782A CA 1119782 A CA1119782 A CA 1119782A CA 000309900 A CA000309900 A CA 000309900A CA 309900 A CA309900 A CA 309900A CA 1119782 A CA1119782 A CA 1119782A
- Authority
- CA
- Canada
- Prior art keywords
- oxygen
- waste liquor
- enriched gas
- wet oxidation
- mixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 20
- 238000009279 wet oxidation reaction Methods 0.000 title claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000001301 oxygen Substances 0.000 claims abstract description 53
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001868 water Inorganic materials 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract description 2
- 230000003405 preventing effect Effects 0.000 abstract description 2
- 230000002269 spontaneous effect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 235000012206 bottled water Nutrition 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000012476 oxidizable substance Substances 0.000 description 1
- 229960003903 oxygen Drugs 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A safe method for mixing pure oxygen, or an oxygen enriched gas, at high pressure, with waste liquor in a wet oxidation system, such that inter-mittent drying conditions are avoided, thereby pre-venting possible spontaneous combustion, fire or explosion; comprising adding the oxygen to pure water before it is mixed with the waste liquor.
A safe method for mixing pure oxygen, or an oxygen enriched gas, at high pressure, with waste liquor in a wet oxidation system, such that inter-mittent drying conditions are avoided, thereby pre-venting possible spontaneous combustion, fire or explosion; comprising adding the oxygen to pure water before it is mixed with the waste liquor.
Description
The present invention relates to a process for the wet oxidation of waste liquor.
Pollution control by oxidation of aqueous ~ solutions or suspensions of organic waste products : 5 with an oxygen-containing gas at high temperature and pressure is a well-known procedure known as wet oxidation; see for example U.S. Patent 2,665,249.
In all priox art wet oxidation processes, the oxygen-;` containing gas i5 ad~ed directly to the aqueous waste solution or susp.ension either before or after ;; the waste is introduced into the wet oxidation re~ :
' actor.
: In prior art w~t oxidation prooess~s, waste liquor and compres3ed air can be directly - 15 mixed wlth no hazard, hut if pure oxygen or an oxy-gen enriched gas is used to supply oxygen for the oxidation pro~ess, special precautions have to be taken to prevent a spontan~ous combustion occurring at the point oxygen and waste liquor are being mixed.
~. 20 The primary hazard is caused by a condition o~ inter-- mittent wetting and drying in a section of pipe, : leadins to the formation oE a dry film of combustible material in direct contact with the oxygen or cxygen bearing gas. This dry combustible film ignites-spontaneously, leading to fire, explosion and ailure of pressurized equipment. The wetting-drying con-: dition may be cau~ed by an interruption in the flow of gas or liyuid or even by normal variation in the flow of the gas and the liquor.
Xn accordance with the present invention there is provided a process for carrying out a wet oxl~ation o~ a waste liquor with oxygen or oxygen ,: ~ , . . ~ , . . . .
~ ..
~' ,' ;.' ' .
enriched gas in a reactor, the imp~ovement which comprises mixing said oxygen or oxygen enriched ga~ with pure water prior to adding said oxygen or oxygen enriched gas to said waste liquor, In order to obviate the possibility of spontaneous combustion, the oxygen or oxygen-con-taining yas flows at high pressure to a point where it is mixed with a stream of pure water which shGuld be distilled, deionized, or potable water from which lQ the hardness and substantially all oils, grease or other oxidizable substances have been removed. This ~; water flows through an intake to e.g., a conven-tional tee where it is mixed with the oxygen or oxygen enriched gas.
The water-oxygen material now mixed then flows through a pipe to another tee or the like where it ls mixed with the waste liquor flowing to th~ reactor. This may be a location in a pipe line carrying the waste liquor to wet oxidation re-actor, but it may also be at a point inside the reactor itself where the oxygen is to be injected.
:~ This eliminates the possibility of the formation of any dry deposits of combustible mate-'! rials which may come in direct contact with high pressure oxygen or oxygen~enriched gas.
The invention will now be described with reference to the figure of the accompanying draw-ing which is a diagrammatic representation of a preferred embodiment.
A pipe 10 leads oxygen or oxygen enriched gas through a check valve 12 and thence to e.g., a tee 14, the other leg of which is a pipe 16 accommo-dating the flow of pure water in the direction of the arrow through another check valve 18 into the tee to mix with the oxygen.
This mixture then flows through a third check valve 20, a pipe 22 and another tee 24, one leg of the tee accommodating the waste liquor as at 26. The water and oxygen bearing gas are mixed in the tee 24 and thence proceed through another pipe , . ` , ~ ~
~ ' .
or equivalent 28 to the reactor.
It is to be understood that the mlxture of the water and oxygen or oxygen-enriched gas and the waste liquor may actually take place inside the reactor should this be found advantageous or desirable.
In this invention it is emphasized that the oxygen or oxygen-enriched gas must be mixed wlth water before it is used in wet oxidation.
The purpose of the water injection is to eliminate any possibility of the formation of any dry deposits of combustible material in direct contact with the high pressure oxygen. This is accomplished by pre-venting any liquid containing combustible materials from flowing into or contaminating the oxygen supply line and by preventîng the formation of dry spots in the areas which have been in contact with waste liquor, and forming more positive and cleaner seals in the check valves 12 and 20 in case of any inte~ruption to the flow of oxygen~
The amount of water mixed with the oxygen or oxygen-enriched ~as is also irnportant. If too little water is used, the surface of pipes 14 and 22 may not be sufficiently wetted to prevent com-bustion. There may also not be ~snough water to pre-vent backflow of waste liquor into lines 22, 14 and 10. This would lead to the type of hazardous situa-tion which this invention is intended to prevent.
On the Gther hand, if too much watar is mixed with the oxygen or oxygen-enriched gas, the waste liquor will be excesslvely diluted and the wet oxidation process will be uneconomical.
The amount of water that should be mixed with the oxygen or oxygen-enriched gas is between one-hundredth of a pound and tan pounds of water per pound of oxygen, preferably between one-tenth of a pound and one pound of water per pound of oxygen.
For the purpose of the present invention, an oxygen enriched gas is a gaseous mixture pro-duced by adding substantial amounts of oxygen to air ~, -4-or an inert gas such that the resultant mixture : contains at least about 25 per cent by volume o~
. oxygen.
" , :`
.
. .:
,"
; ' :
' . ,:
' ,.
~: .
.. . .
~ ~.
, :~ :
.. ~`" ~
, :
-, .. :i :' : ` : , ~:
., . , ,; , ~ : , :
,, .; ;
.~
Pollution control by oxidation of aqueous ~ solutions or suspensions of organic waste products : 5 with an oxygen-containing gas at high temperature and pressure is a well-known procedure known as wet oxidation; see for example U.S. Patent 2,665,249.
In all priox art wet oxidation processes, the oxygen-;` containing gas i5 ad~ed directly to the aqueous waste solution or susp.ension either before or after ;; the waste is introduced into the wet oxidation re~ :
' actor.
: In prior art w~t oxidation prooess~s, waste liquor and compres3ed air can be directly - 15 mixed wlth no hazard, hut if pure oxygen or an oxy-gen enriched gas is used to supply oxygen for the oxidation pro~ess, special precautions have to be taken to prevent a spontan~ous combustion occurring at the point oxygen and waste liquor are being mixed.
~. 20 The primary hazard is caused by a condition o~ inter-- mittent wetting and drying in a section of pipe, : leadins to the formation oE a dry film of combustible material in direct contact with the oxygen or cxygen bearing gas. This dry combustible film ignites-spontaneously, leading to fire, explosion and ailure of pressurized equipment. The wetting-drying con-: dition may be cau~ed by an interruption in the flow of gas or liyuid or even by normal variation in the flow of the gas and the liquor.
Xn accordance with the present invention there is provided a process for carrying out a wet oxl~ation o~ a waste liquor with oxygen or oxygen ,: ~ , . . ~ , . . . .
~ ..
~' ,' ;.' ' .
enriched gas in a reactor, the imp~ovement which comprises mixing said oxygen or oxygen enriched ga~ with pure water prior to adding said oxygen or oxygen enriched gas to said waste liquor, In order to obviate the possibility of spontaneous combustion, the oxygen or oxygen-con-taining yas flows at high pressure to a point where it is mixed with a stream of pure water which shGuld be distilled, deionized, or potable water from which lQ the hardness and substantially all oils, grease or other oxidizable substances have been removed. This ~; water flows through an intake to e.g., a conven-tional tee where it is mixed with the oxygen or oxygen enriched gas.
The water-oxygen material now mixed then flows through a pipe to another tee or the like where it ls mixed with the waste liquor flowing to th~ reactor. This may be a location in a pipe line carrying the waste liquor to wet oxidation re-actor, but it may also be at a point inside the reactor itself where the oxygen is to be injected.
:~ This eliminates the possibility of the formation of any dry deposits of combustible mate-'! rials which may come in direct contact with high pressure oxygen or oxygen~enriched gas.
The invention will now be described with reference to the figure of the accompanying draw-ing which is a diagrammatic representation of a preferred embodiment.
A pipe 10 leads oxygen or oxygen enriched gas through a check valve 12 and thence to e.g., a tee 14, the other leg of which is a pipe 16 accommo-dating the flow of pure water in the direction of the arrow through another check valve 18 into the tee to mix with the oxygen.
This mixture then flows through a third check valve 20, a pipe 22 and another tee 24, one leg of the tee accommodating the waste liquor as at 26. The water and oxygen bearing gas are mixed in the tee 24 and thence proceed through another pipe , . ` , ~ ~
~ ' .
or equivalent 28 to the reactor.
It is to be understood that the mlxture of the water and oxygen or oxygen-enriched gas and the waste liquor may actually take place inside the reactor should this be found advantageous or desirable.
In this invention it is emphasized that the oxygen or oxygen-enriched gas must be mixed wlth water before it is used in wet oxidation.
The purpose of the water injection is to eliminate any possibility of the formation of any dry deposits of combustible material in direct contact with the high pressure oxygen. This is accomplished by pre-venting any liquid containing combustible materials from flowing into or contaminating the oxygen supply line and by preventîng the formation of dry spots in the areas which have been in contact with waste liquor, and forming more positive and cleaner seals in the check valves 12 and 20 in case of any inte~ruption to the flow of oxygen~
The amount of water mixed with the oxygen or oxygen-enriched ~as is also irnportant. If too little water is used, the surface of pipes 14 and 22 may not be sufficiently wetted to prevent com-bustion. There may also not be ~snough water to pre-vent backflow of waste liquor into lines 22, 14 and 10. This would lead to the type of hazardous situa-tion which this invention is intended to prevent.
On the Gther hand, if too much watar is mixed with the oxygen or oxygen-enriched gas, the waste liquor will be excesslvely diluted and the wet oxidation process will be uneconomical.
The amount of water that should be mixed with the oxygen or oxygen-enriched gas is between one-hundredth of a pound and tan pounds of water per pound of oxygen, preferably between one-tenth of a pound and one pound of water per pound of oxygen.
For the purpose of the present invention, an oxygen enriched gas is a gaseous mixture pro-duced by adding substantial amounts of oxygen to air ~, -4-or an inert gas such that the resultant mixture : contains at least about 25 per cent by volume o~
. oxygen.
" , :`
.
. .:
,"
; ' :
' . ,:
' ,.
~: .
.. . .
~ ~.
, :~ :
.. ~`" ~
, :
-, .. :i :' : ` : , ~:
., . , ,; , ~ : , :
,, .; ;
.~
Claims (2)
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. In a process for carrying out a wet oxidation of a waste liquor with oxygen or oxygen enriched gas in a reactor, the improvement which comprises mixing said oxygen or oxygen enriched gas with pure water prior to adding said oxygen or oxygen enriched gas to said waste liquor and adding said mixture of oxygen or oxygen enriched gas and pure water to the waste liquor before the latter is introduced into the reactor.
2. A process according to claim 1, in which the amount of pure water mixed with the oxygen or oxygen enriched gas is in the proportion of between one-hundredth of a pound and ten pounds of water per pound of oxygen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US83423277A | 1977-09-19 | 1977-09-19 | |
| US834,232 | 1977-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119782A true CA1119782A (en) | 1982-03-16 |
Family
ID=25266441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000309900A Expired CA1119782A (en) | 1977-09-19 | 1978-08-23 | Wet oxidation of waste liquor |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5451247A (en) |
| BE (1) | BE870285A (en) |
| CA (1) | CA1119782A (en) |
| CH (1) | CH628254A5 (en) |
| DE (1) | DE2840041A1 (en) |
| FR (1) | FR2403304A1 (en) |
| GB (1) | GB2004532B (en) |
| NL (1) | NL7809242A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395339A (en) * | 1982-04-01 | 1983-07-26 | Sterling Drug Inc. | Method of operating pure oxygen wet oxidation systems |
| JPS6426268A (en) * | 1987-07-22 | 1989-01-27 | Fujitsu Ltd | Priority control system in main storage access |
| US7334613B2 (en) | 2002-10-15 | 2008-02-26 | Black & Decker Inc. | Router base securing mechanism |
| USD546654S1 (en) | 2004-01-29 | 2007-07-17 | Black & Decker Inc. | Router with plunge base |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1001010A (en) * | 1972-10-05 | 1976-12-07 | Sterling Drug Inc. | Oxidation of water-insoluble substances |
| US3919837A (en) * | 1974-03-07 | 1975-11-18 | Sterling Drug Inc | Method and apparatus for startup of a wet air oxidation unit provided with rotating air compressors driven by rotating expanders |
| JPS5912358B2 (en) * | 1975-08-29 | 1984-03-22 | ニホンサンソ カブシキガイシヤ | Peptide derivative and method for measuring collagenase activity using the peptide derivative |
| DE2640603B2 (en) * | 1976-09-09 | 1978-10-19 | Bayer Ag, 5090 Leverkusen | Process for the wet oxidation of organic substances |
-
1978
- 1978-08-23 CA CA000309900A patent/CA1119782A/en not_active Expired
- 1978-09-04 GB GB7835451A patent/GB2004532B/en not_active Expired
- 1978-09-07 BE BE1009049A patent/BE870285A/en not_active IP Right Cessation
- 1978-09-08 FR FR7825972A patent/FR2403304A1/en active Granted
- 1978-09-11 NL NL7809242A patent/NL7809242A/en not_active Application Discontinuation
- 1978-09-12 JP JP11216878A patent/JPS5451247A/en active Pending
- 1978-09-13 CH CH955478A patent/CH628254A5/en not_active IP Right Cessation
- 1978-09-14 DE DE19782840041 patent/DE2840041A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| GB2004532A (en) | 1979-04-04 |
| DE2840041A1 (en) | 1979-03-29 |
| GB2004532B (en) | 1982-03-24 |
| BE870285A (en) | 1979-03-07 |
| JPS5451247A (en) | 1979-04-21 |
| FR2403304B1 (en) | 1983-09-16 |
| NL7809242A (en) | 1979-03-21 |
| CH628254A5 (en) | 1982-02-26 |
| FR2403304A1 (en) | 1979-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Beltran et al. | Advanced oxidation of atrazine in water—I. Ozonation | |
| CA1119782A (en) | Wet oxidation of waste liquor | |
| GB1531962A (en) | Method for determining the inorganic carbon content of aqueous liquids | |
| BG61459B1 (en) | Istallation and method for the utilization of cumbustible materials, especially of industrial and residential wastes | |
| CN107975360A (en) | A kind of device and method of oil well gathering system hydrogen sulfide HIGH PRESSURE TREATMENT | |
| US2695836A (en) | Process and apparatus for control of gas treatment | |
| US2881137A (en) | Bacterial digestion of organic matter | |
| CN219784338U (en) | Device for treating polycrystalline silicon cold hydrogenation slag slurry hydrolysis tail gas | |
| CA1190802A (en) | Method of operating pure oxygen wet oxidation systems | |
| AU625618B2 (en) | Process and equipment for the heat treatment, before hardening, of metallic pieces, by cementation, carbonitridation or heating | |
| Guittonneau et al. | Characterization of natural water for potential to oxidize organic pollutants with ozone | |
| KR810002013B1 (en) | Process for wet oxidotion of waste liquor | |
| BR0315210B1 (en) | process for reducing the slurry formed during the biological treatment of an aqueous effluent. | |
| Benitez et al. | Protocatechuic acid ozonation in aqueous solutions | |
| KR102675295B1 (en) | Rust prevention agents inserting apparatus for prevention of formation of solid matter in drinking water distribution system | |
| Price | Wet oxidation of human waste | |
| US5932067A (en) | Method and apparatus for processing a fibrous mass in a spiral shaped flow-typed tube cell | |
| CN208994395U (en) | A kind of dust technology tank system that achievable flash recycles automatically | |
| JPS55147191A (en) | Treatment process for waste water | |
| JPS56136980A (en) | Corrosion preventing method for copper and copper alloy material for condenser | |
| JPS5649301A (en) | Diluting method of chemical liquid | |
| Connell et al. | Advances in Handling Gas Chlorine | |
| JPS5617691A (en) | Manufacturing apparatus of air dissolved pressure water at floating cleaning treatment of contaminated water | |
| Naimie | Oxidation of chloramine by ozone, reaction kinetics | |
| Belous et al. | The Corrosion of Carbon Steel in High-Purity Oxygen-Containing Water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |