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1. 发明专利

JPH06285334A TREATMENT OF VOLATILE ORGANIC HALOGEN COMPOUND 失效
公开(公告)号：JPH06285334A
公开(公告)日：1994-10-11
申请号：JP7796893
申请日：1993-04-05
申请人： KURITA WATER IND LTD
发明人： MIYABE HIROSHI , TSURUMARU AKIYOSHI , KAGIWADA MASAKO , IWASAKI MAKOTO
IPC分类号： B01D53/86 , B01J23/44 , C02F1/70 , B01D53/36
摘要： PURPOSE:To efficiently make a gas contg. volatile org. halogen compds. harmless without leaving an intermediate coexistent with the compds. by using a palladium catalyst and a platinum catalyst as the metal-supporting catalysts for treating the compds. CONSTITUTION:A gas contg. volatile org. halogen compds. to be treated is supplied to a gas mixing tank 1A from a pipeline 11 along with gaseous hydrogen from a pipeline 31 and sufficiently mixed with the gaseous hydrogen, and then the mixture is supplied to a catalyst-packed tower 1B by a pipeline 12 to conduct catalytic decomposition in the first stage. The gas is then successively passed through the pipeline 13, gas mixing tank 2, pipeline 14, catalyst-packed tower 2B in the second stage and further through the third, fourth and fifth stages. The towers 1B and 2B are packed with a palladium catalyst and the towers 3B, 4B and 5B with a platinum catalyst. The substances to be treated are rapidly decomposed with the palladium catalyst and completely decomposed with the platinum catalyst without leaving a reaction intermediate.

2. 发明专利

JPH08155491A BIOLOGICAL DENITRIFICATION APPARATUS 失效
公开(公告)号：JPH08155491A
公开(公告)日：1996-06-18
申请号：JP30073594
申请日：1994-12-05
申请人： KURITA WATER IND LTD
发明人： MITA MASAICHIRO , NISHIKAWA SHOZO , KAGIWADA MASAKO , FUKASE TETSURO
IPC分类号： C02F3/34
摘要： PURPOSE: To prevent sludge in a denitrification tank from floating and to enable stable and efficient denitrification by removing sludge which floated from the denitrification tank in which dirty water is passed through a sludge bed added with elemental sulfur in a upward current, adding a surface active agent to the sludge in a reaction vessel, mixing them, and returning liquid in the reaction vessel to the denitrification tank. CONSTITUTION: In a denitrification apparatus, raw water is introduced from a raw water inflow pipe 2 to the bottom part of a denitrification tank 1 in which a fluidized bed 1A added with elementary sulfur as an electron donor is formed to be denitrified in an upward current. The treated water is removed from the upper part of the tank through a treated water take off pipe 3. In this process, an extraction pipe 4 for floating sludge is placed near the upper part of the fluidized bed 1A, sludge extracted from the pipe 4, after being added with a surfactant in a surfactant storage tank 6 by a pipe 5, is modified in a reaction vessel 7, and the modified sludge is refluxed to the bottom part of the denitrification tank 1 through a pipe 8. In this way, the sludge is prevented from floating and flowing out so that the amount of sludge held in the denitrification tank 1 is kept high.

3. 发明专利

JPH078970A REMOVAL OF ALCOHOL IN WATER 失效
公开(公告)号：JPH078970A
公开(公告)日：1995-01-13
申请号：JP15876293
申请日：1993-06-29
申请人： KURITA WATER IND LTD
发明人： NAKAHARA TOSHIJI , KAGIWADA MASAKO
IPC分类号： C02F1/58 , C02F1/72 , C02F9/00
摘要： PURPOSE:To easily and efficiently decompose and remove alcoholes in water by bringing alcohol-containing water into contact with an oxidizing agent in the presence of a metal catalyst supported on activated carbon before bringing the same into contact with an ion exchange resin. CONSTITUTION:For example, 40mg/l of hydrogen peroxide is added to a soln. prepared by adding 1mg/l of ethanol and 1mg/l of isopropyl alcohol to ultra- pure water as an oxidizing agent. The raw water to which this oxidizing agent is added is passed through a catalytic reaction tower 1 packed with Pt-supported activated carbon and subsequently passed through a weak anion exchange resin tower 2, a strong cation exchange resin tower 3 and a strong anion exchange resin tower 4 in succession. The water passing condition of the catalytic reaction tower 1 is set, for example, to S=2hr and temp. 20 deg.C and the water passing conditions of the towers 2, 3, 4 are set to SV=1hr . By this constitution, alcohols in water, especially, lower alcohols difficult to remove heretofore in water can easily be decomposed and removed.

4. 发明专利

JPH06178986A METHOD OF REMOVING ALCOHOL OR KETONES FROM WATER 失效
公开(公告)号：JPH06178986A
公开(公告)日：1994-06-28
申请号：JP33430892
申请日：1992-12-15
申请人： KURITA WATER IND LTD
发明人： NAKAHARA TOSHIJI , KAGIWADA MASAKO
IPC分类号： C02F1/58 , C02F1/72
摘要： PURPOSE:To decompose and remove alcohol or ketones in water easily and efficiently. CONSTITUTION:Water contg. an alcohol or a ketone is brought into contact with a oxidizing agent in the presence of a metallic catalyst having a natural or artificial mineral-based solid acid as a carrier. Thus, an alcohol or a ketone is efficiently decomposed to generate CO2 and H2O and is removed from the water. Lower alcohols or ketones heretofore regarded as difficult to remove can be decomposed and removed easily and efficiently without utilizing a severe reaction condition, etc. The method is effective for decomposition and removal of a lower alcohol or a ketone as a minor org. material in a semiconductor waste water.

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