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11. 发明专利

JPH06201588A MEASURING METHOD OF CONCENTRATION OF AMMONIUM ION IN WATER 失效
公开(公告)号：JPH06201588A
公开(公告)日：1994-07-19
申请号：JP35903692
申请日：1992-12-25
申请人： KURITA WATER IND LTD
发明人： TAKABAYASHI YASUHIKO , ODA NOBUHIRO
IPC分类号： G01N15/06 , G01N21/33 , G01N21/77 , G01N31/00
摘要： PURPOSE:To measure the concentration of ammonium ions in a test water at real time by a method whereby nitrite of a known amount is added to the test water containing ammonium ions, the added substance is supplied to an ammonia decomposing apparatus filled with a catalyst holding a noble metal while the substance is heated, the absorbance of an ultraviolet part of the obtained effluent is measured and the consuming amount of nitrite is detected. CONSTITUTION:A known amount of nitrite is added to a to-be-tested water containing ammonium ions, which is supplied to an ammonia decomposing apparatus filled with a catalyst holding a noble metal while being heated. The amount of the noble metal is generally 0.1-10wt.% to the carrier. The decomposing condition at the decomposing apparatus is generally 70-300 deg.C of the temperature and 3-60 minutes of the reaction time. 0.5-10hr is set for SV and pH is near to neutral. The ammonia in the to-be-tested water is decomposed according to a formula NH4 +NO2 N2 +2H2O. The absorbance of an ultraviolet part of the effluent from the apparatus is measured thereby to obtain the consuming amount of nitrite. The concentration of ammonium ions is calculated from the consuming amount.

12. 发明专利

JPH08192169A TREATMENT OF WASTE WATER CONTAINING NITRATE NITROGEN AND AMMONIA NITROGEN 失效
公开(公告)号：JPH08192169A
公开(公告)日：1996-07-30
申请号：JP1984295
申请日：1995-01-12
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： YUASA YOSHIRO , IZUMITANI SUSUMU , ASADA TOMOYUKI , KIMOTO HIROSHI , TAKABAYASHI YASUHIKO , NAKAHARA TOSHIJI
IPC分类号： C02F1/58
摘要： PURPOSE: To efficiently remove nitrate nitrogen and ammonia nitrogen by bringing nitrate nitrogen in waste water into contact with a metal generating hydrogen in water to reduce the same and removing the eluted metal by softening treatment before reacting nitrite nitrogen and ammonia nitrogen in the presence of a catalyst to convent them to nitrogen. CONSTITUTION: Desulfurization waste water is guided to a reducing tank 1 to be adjusted to the optimum pH and a metal generating hydrogen in water is added to the waste water to reduce nitrate nitrogen under stirring. The treated water wherein nitrate nitrogen is reduced to nitrite nitrogen or nitrogen gas is sent to a pretreatment tank 3 by a pump 2 and, after the pH of the treated water is adjusted, a flocculant is added to the treatd water to allow the treated water to stand under gentle stirring to sediment floc. The supernatant liquid is sent to a filter 5 by a pump 4 to filter off a fine suspended substance. The filtrate is sent to an adjusting tank 6 to be adjusted to pH 6-8 and sent to a catalyst packed tower 9 by a pump 7 through a heater 8 while an oxidizing agent is added to the filtrate to react ammonia nitrogen and nitrite nitrogen.

13. 发明专利

JPH0810776A TREATMENT OF WATER CONTAINING AMMONIA NITROGEN AND METAL SALT 失效
公开(公告)号：JPH0810776A
公开(公告)日：1996-01-16
申请号：JP14454794
申请日：1994-06-27
申请人： KURITA WATER IND LTD
发明人： TAKABAYASHI YASUHIKO , NAKAHARA TOSHIJI
IPC分类号： C02F1/58 , B01J23/96 , B01J38/60 , C02F1/72
摘要： PURPOSE:To easily and efficiently performing the reactivation of the catalyst by reactivating it with a specific sulfuric acid solution when the catalyst performance is deteriorated in the treatment comprising adding an oxidizing agent to water contg. ammonia.' nitrogen and metal salts and then allowing the resulting water to contact with a catalyst while heating to remove the ammonia nitrogen and the metal salts. CONSTITUTION:In an equipment for removing ammonia and metal salts in waste water discharged from a semiconductor manufacturing process, the waste water in a storage tank 1 and a pH adjusting agent in another storage tank 2 are introduced into a pH adjusting tank 3 provided with a pH controller 3A and an agitator 3B to adjust the pH of the waste water to >=4. Then, the waste water having an adjusted pH is introduced together with an oxidizing agent in a storage tank 5 into a heater 6 using a heat source such as steam, etc., through a pipeline 13. The heated waste water having an adjusted pH is transferred into a catalyst tower 4 and there, the ammonia nitrogen in the waste water is subjected to catalytic oxidation to remove it from the waste water through decomposing it. When the performance of the catalyst in the catalyst tower 4 is deteriorated, the deteriorated catalyst is reactivated by adjusting the H2SO4 concn. of the waste water in the pH adjusting tank 3 to 0.01 to 1N and passing the resulting H2SO4 solution through the catalyst tower 4.

14. 发明专利

JPH07328651A TREATMENT OF NITRATE NITROGEN-CONTAINING WATER 失效
公开(公告)号：JPH07328651A
公开(公告)日：1995-12-19
申请号：JP13220094
申请日：1994-06-14
申请人： KURITA WATER IND LTD
发明人： NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO
IPC分类号： C02F1/70 , C02F1/72
摘要： PURPOSE:To provide a treating method of nitrate nitrogen-containing water capable of easily and efficiently decomposing and removing the nitrate nitrogen at a low temp. CONSTITUTION:The nitrate nitrogen-containing water 6 adjusted pH in an adjusting vessel 3 is introduced into a 1st reacting vessel 1 and is allowed to contact with a metal 1a generating hydrogen in water to reduce the nitrate nitrogen to nitrite nitrogen or ammoniac nitrogen and the reaction solution 13 is introduced into a 2nd reacting vessel 2 in the presence of an oxidizing agent or a reducing agent and is allowed to contact with an oxidoreduction catalytic layer 2a to convert into gaseous nitrogen.

15. 发明专利

JPH078974A DECOMPOSITION OF AMMONIA 失效
公开(公告)号：JPH078974A
公开(公告)日：1995-01-13
申请号：JP17480993
申请日：1993-06-22
申请人： KURITA WATER IND LTD
发明人： SAKAMOTO SHUICHI , NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO
IPC分类号： C02F1/58 , C02F1/72
摘要： PURPOSE:To obtain treated water low in the total concn. of nitrogen and having stable quality by adding an oxidizing agent used in combination with a nitrite and oxygen or an oxygen source substance to ammonia-containing water before bringing ammonia-containing water into contact with a metal catalyst under heating. CONSTITUTION:An oxidizing agent aq. soln. wherein a nitrite and an oxygen source substance such as hydrogen peroxide are mixed and dissolved pref. in a mol ratio of 4:3 to 6:1 is stored in an oxidizing agent aq. soln. storage tank 2 and added to the water to be treated sent from a water-to-be-treated storage tank 1 by a pump 3a through a pump 3b. The addition amt. thereof is pref. set to about 0.8 to 1.07 times the amt. necessary for decomposing ammonia in water to be treated. The water to be treated to which the oxidizing agent aq. soln. is added is sent to a catalyst tower 6 through a heat exchanger 4 and a heater 5 to decomose ammonia in the water to be treated. The treated water issuing from the catalyst tower 6 passes through the heat exchanger 4 to be discharged out of the system through a pressure control valve 7.

16. 发明专利

JPH0910780A TREATMENT OF ALKANOLAMINE CONTAINING WASTE WATER 失效
公开(公告)号：JPH0910780A
公开(公告)日：1997-01-14
申请号：JP18981395
申请日：1995-07-03
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： YUASA YOSHIRO , IZUMITANI SUSUMU , KAGAWA KOJI , ASADA TOMOYUKI , JOKO ISAO , NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO , ASADA HIROYUKI , KITAMI HIROKO
IPC分类号： C02F1/58 , B01J23/42 , B01J23/44 , B01J23/89 , C02F1/72
摘要： PROBLEM TO BE SOLVED: To easily and efficiently decompose alkanolamine by a small capacity apparatus by adding an oxidizing agent to waste water containing alkanolamaine and subjecting alkanolamine to oxidative decomposition in the presence of a metal catalyst under a heating condition. SOLUTION: When waste water containing monoethanolamine, diethanolamaine, triethanolamine or monoisopropanolamine is treated, an oxidizing agent is added to the waste water and alkanolamine is subjected to oxidative decomposition in the presence of a metal catalyst at 40-250 deg.C. At this time, as the oxidizing agent, hydrogen peroxide is used or hydrogen peroxide and nitrite are together used. The use amt. of the oxidizing agent is set to 1-5 times the reaction equivalent of alkanolamine. As the metal catalyst, a catalyst wherein platinum, palladium, gold or iron oxide is supported on a carrier such as titania, alumina or zeolite in an amt. of 0.1-1wt.% is used.

17. 发明专利

JPH08192192A METHOD FOR TREATING FLUE GAS DESULFURIZATION DRAIN 失效
公开(公告)号：JPH08192192A
公开(公告)日：1996-07-30
申请号：JP1984095
申请日：1995-01-12
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： YUASA YOSHIRO , IZUMITANI SUSUMU , ASADA TOMOYUKI , KIMOTO HIROSHI , NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO , KITAMI HIROKO
IPC分类号： B01D53/50 , B01D53/77 , C02F1/58 , C02F1/70 , C02F1/72 , C02F9/00
摘要： PURPOSE: To remove nitrogen compounds in the drain of flue gas desulfurization by catalytic decomposition without causing a lowering of catalyst performance due to the generation of scale of gypsum or metal by a method wherein the flue gas desulfurization drain is softened to provide softened treated water, which is treated in the presence of catalyst to reduce nitric acid, and ammonia is oxidized in the presence of catalyst. CONSTITUTION: Alkali is added to flue gas desulfurization drain in a softening treatment tank 1, while the drain is being agitated, thereby to adjust pH to, for example, 11 or more, and carbonate is added thereto and further flocculant is added. The treated water, in which metal hydroxide and calcium carbonate are deposited and coagulated, is sent to a concentration device 2, where supernatant liquid is sent to a filter 4 by a pump 3, and then pH of the water is adjusted to, for example, 6-8 at a pH adjusting tank 5. Thereafter, water is sent to a catalyst packed tower 9A via a heat exchanger 7 and a heater 8, in which reducing agent is added to water to reduce nitric acid ion. The treated water which leaves the tower A9 and to which an oxidizing agent is added on piping way is sent to a catalyst packed tower B10, where ammonium ion is oxidized.

18. 发明专利

JPH0839081A TREATMENT OF REGENERATED WASTE WATER OF CONDENSED WATER DESALTING APPARATUS 失效
公开(公告)号：JPH0839081A
公开(公告)日：1996-02-13
申请号：JP20006694
申请日：1994-08-02
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： YUASA YOSHIRO , IZUMITANI SUSUMU , NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO , ETO YOSHIHIRO , JOKO ISAO
IPC分类号： C02F1/58 , B01J23/42 , C02F1/72
摘要： PURPOSE:To stably reduce the concn. of total nitrogen in treated water, in performing catalytic decomposition of ammonia contained in regenerated waste water of a condensed water desalting apparatus, by adding nitrite to perform catalytic decomposition and further adding hydrogen peroxide to perform catalytic decomposition. CONSTITUTION:When ammonia-containing waste water generated when an ion exchange resin is regenerated in a condensed water desalting apparatus is treated, at first, waste water is guided to a storage tank 1 of water to be treated and an acid or alkali is added to waste water to adjust the pH of waste water to 5-8 and, next, an aq. nitrite soln. in an aq. nitrite soln. storage tank 2 is added so that a ratio of nitrite nitrogen/ammonia nitrogen becomes 0.8-1.0. Thereafter, water to be treated is sent to a first catalyst column 6 to decompose the greater part of ammonia contained in water to be treated. The treated water issued from the first catalyst column 6 is sent to a second catalyst column 8 while the aq. hydrogen peroxide soln. of a storage tank 7 is added to treated water to decompose residual ammonia by decomposition reaction.

19. 发明专利

JPH07328653A DENITRIFICATION TREATMENT 失效
公开(公告)号：JPH07328653A
公开(公告)日：1995-12-19
申请号：JP12368594
申请日：1994-06-06
申请人： KURITA WATER IND LTD
发明人： SAKAMOTO SHUICHI , NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO
IPC分类号： C02F1/58 , C02F1/70
摘要： PURPOSE:To effectively obtain a treated water low in the content of nitrogen component by treating a water containing ammoniacal nitrogen and nitrate nitrogen with a catalyst. CONSTITUTION:The water containing the ammoniacal nitrogen and the nitrate nitrogen is catalytically treated under a heating condition by adding a reducing agent and, after that, is catalytically treated under the heating condition by adding a nitrite and hydrogen peroxide. Thus, the ammoniacal nitrogen and the nitrate nitrogen are converted into gaseous nitrogen and removed from the water to be treated by the addition of the reducing agent. By the addition of the nitrite, the ammoniacal nitrogen is allowed to react with nitrite nitrogen and converted into gaseous nitrogen and water. Further, the ammoniacal nitrogen is allowed to react with hydrogen peroxide to convert into gaseous nitrogen, water and hydrogen ion and the nitrate and the ammoniacal nitrogen in the water to be treated are made harmless and removed.

20. 发明专利

JPH07328647A TREATMENT OF AMMONIACAL NITROGEN-CONTAINING WATER 失效
公开(公告)号：JPH07328647A
公开(公告)日：1995-12-19
申请号：JP15521894
申请日：1994-06-14
申请人： KURITA WATER IND LTD
发明人： NAKAHARA TOSHIJI , TAKABAYASHI YASUHIKO
IPC分类号： C02F1/58 , C02F1/72 , C02F1/74
摘要： PURPOSE:To sufficiently remove ammoniacal nitrogen even when the equivalent ratio of an oxidizing agent to be added is low by aerating and removing ammonia gas by the aeration of a treated water after catalytic oxidation decomposition, absorbing the ammonia gas aerated by the aeration to a raw water and treating again. CONSTITUTION:When the treated water from a catalyst tower 6 is introduced into a gas-liquid separating tank 9, gaseous nitrogen in the water becomes bubbles to be separated and is collected to a vapor phase. At this time, the ammoniacal nitrogen remained in the water is vaporized as ammonia gas and moved to the gas phase by the bubbling of gaseous nitrogen. The temp. of the treated water is preferably from room temp. to about 180 deg.C to vaporize the ammonia gas from the treated water from the catalyst tower 6 to the vapor phase, and the gaseous mixture separated in the gas-liquid separating vessel 9 is introduced to a raw water tank through a pressure control valve 10 and ammonia gas in the gaseous mixture is absorbed and dissolved in the raw water.

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