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1. 发明专利

JPH10216487A WASHING METHOD OF MEMBRANE 失效
公开(公告)号：JPH10216487A
公开(公告)日：1998-08-18
申请号：JP2051397
申请日：1997-02-03
申请人： KURITA WATER IND LTD
发明人： CHIKASAWA KIYOHITO , TAKADOI TADASHI
IPC分类号： B08B3/08 , B01D65/02 , B01D65/06
摘要： PROBLEM TO BE SOLVED: To prevent deterioration of a recovering ability of membrane performance due to chemical washing and generation of slime during shut-down period to maintain the membrane in a good state over a long period of time by allowing a wash chemical to contact with a membrane surface at the time of long term shut-down of a membrane separation device. SOLUTION: At the time of an operation of the membrane separation device, a water passing treatment and a back washing with a permeated water or a pressurize air, etc., for a prescribed time are executed alternately, moreover, the chemical washing for several hour to ten and several hour is executed periodically. At the time of a long term shut-down of a membrane separation device, an alkali aq. soln. such as NaOH aq. soln. is supplied with a washing pump 3 to a permeated water chamber 1B and a raw water chamber 1A of a membrane module 1 from an alkali tank 2A of a wash chemical tank 2 through pipings 22, 23, 24 and 25, and after circulating through the piping 26 and 27 and the pining 29 and 30, an acid aq. soln. such as HCl aq. soln. is supplied similarly to the membrane module 1 from an acid tank 2B of the wash chemical tank 2 through the piping 21, and subjected to return circulation through the pipings 28 and 31, and in such a way, a recovery property of the membrane performance is improved by chemical washing, and washing frequency is reduced to improve an operating efficiency, and the generation of the slime, etc., at the time of the shut-down is prevented and the deterioration of the membrane is prevented.

2. 发明专利

JPH10151457A WASTEWATER MEMBRANE TREATMENT METHOD 失效
公开(公告)号：JPH10151457A
公开(公告)日：1998-06-09
申请号：JP31501696
申请日：1996-11-26
申请人： KURITA WATER IND LTD
发明人： TAKADOI TADASHI , SATO TAKESHI , CHIKASAWA KIYOHITO
IPC分类号： B01D61/16 , B01D61/20 , C02F1/44 , C02F1/52
摘要： PROBLEM TO BE SOLVED: To lessen the use amount of a flocculating agent and the amount of sludge to be generated by separately taking out a part of a liquid and a part of separated sludge in a circulation tank, adding an additive agent to dissolve a flocculating agent again, and adding the resultant flocculant to a flocculation reaction tank in wastewater treatment comprising processes of adding the flocculating agent to wastewater in the flocculation reaction tank, further adding activated carbon, carrying out membrane separation treatment and turning back the resultant concentrated liquid to the circulation tank. SOLUTION: Wastewater, for example from a thermal power plant, is led to a flocculation reaction tank 1, a flocculating agent is added, and flocculation treatment is carried out at a prescribed pH. The resultant flocculated wastewater is led to a raw water chamber 4a of a membrane module 4 through a pump 3 and in this method, activated carbon powder is added to the wastewater to be sent to the membrane module 4 from the circulation tank 2. Based on the necessity, a part of the concentrated water from the raw water chamber 4a of the membrane module 4 is turned back to the flocculation reaction tank 1 and the remaining is turned back to the circulation tank 2. The liquid in the circulation tank 2 is taken out and an acid such as HC1 is added to dissolve the flocculating agent again in the liquid and the resultant liquid of the dissolution treatment is sent back to the flocculation reaction tank 1 by a pump 7 and a flocculating agent in the liquid is re-used for flocculation treatment of wastewater.

3. 发明专利

JPH0985262A TREATMENT OF FLUORINE-CONTAINING WASTE WATER 失效
公开(公告)号：JPH0985262A
公开(公告)日：1997-03-31
申请号：JP27169895
申请日：1995-09-26
申请人： KURITA WATER IND LTD
发明人： TAKADOI TADASHI , CHIKASAWA KIYOHITO
IPC分类号： C02F1/44 , C02F1/52 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To enable long-time continuous operation by preventing the lowering of the flux of a membrane when an aluminum compd. is added to fluorine- containing waste water containing a calcium salt to treat waste water and the treated waste water is subjected to solid-liquid separation treatment by the membrane to enhance the rate of operation of an apparatus in the treatment of fluorine-containing waste water. SOLUTION: Polyaluminum chloride and hydrochloric acid are added to fluorine-containing waste water containing a calcium salt in a reaction tank to be subjected to flocculation treatment and this treated waste water is subjected to solid-liquid separation by a membrane.

4. 发明专利

JPH08323163A METHOD FOR OPERATING MEMBRANE SEPARATOR 失效
公开(公告)号：JPH08323163A
公开(公告)日：1996-12-10
申请号：JP13659695
申请日：1995-06-02
申请人： KURITA WATER IND LTD
发明人： TAKADOI TADASHI , CHIKASAWA KIYOHITO
IPC分类号： B01D65/06
摘要： PURPOSE: To make it possible to sufficiently restore the flux of a separating membrane when this flux degrades by interrupting the passage of raw water, bringing clean water into contact with this separating membrane and bringing an alcohol liquid into contact with the separating membrane at the time of washing the separating membrane. CONSTITUTION: Respective liquids; NaOH, HCl, industrial water and alcohol liquid, are supplied from storage tanks 7, 8, 9, 10 in which the NaOH, HCl, industrial water and alcohol liquid are kept stored, into a raw water chamber 4a and a permeated water chamber 4b by pipings 7a, 8a, 9a, 10a, a pump 11 and supply pipes 12, 13 in order to wash the separating membrane 4A. The device is so constituted that these liquids are returned from the respective chambers 4a, 4b to the respective storage tanks 7 to 10 by return pipes 14, 15 and pipings 7b, 8b, 9b, 10b. The respective pipings 7a to 10a, 7b to 10b are provided with stop valves so that any one kind of the liquid is simultaneously fed to the raw water chamber 4a and the permeated water chamber 4b and is returned simultaneously from the respective chambers 4a, 4b to the storage tanks.

5. 发明专利

JPH06254571A TREATMENT OF FLUORINE CONTAINING WATER 失效
公开(公告)号：JPH06254571A
公开(公告)日：1994-09-13
申请号：JP4801893
申请日：1993-03-09
申请人： KURITA WATER IND LTD
发明人： SATO SHIN , TAKADOI TADASHI , OMI TADAHIRO
IPC分类号： C02F1/58
摘要： PURPOSE:To miniaturize a device and to improve the removing ratio of fluorine by passing one part of a flowing-out water from plural calcium carbonate packed towers through the same, packed tower again in treating a fluorine containing water by passing through the packed towers in series. CONSTITUTION:The high concn. fluorine containing water containing hydrofluoric acid, ammonium fluoride or the like, once stored in a raw water tank 4 from a pipe line 21, is introduced into a circulating water tank 6 by a raw water pump 5 and is introduced into the calcium carbonate packed tower 1 with the flowing-out water from the calcium carbonate packed tower 1 from a pipe line 24 by a pump 9. In the packed tower, fluorine is removed and recovered by allowing to contact with calcium carbonate to make calcium fluoride and the flowing-out water of the packed tower is returned to the circulating water tank 6. Further, an over-flow water from the circulating water tank 6 is fed to the same type circulating water tanks 7, 8 and the water in each of circulating water tanks 7, 8 is circulated through the packed towers 2, 3 in the same way, in which fluorine is removed and recovered.

6. 发明专利

JPH06170379A TREATMENT OF ACIDIC FLUORINE-CONTAINING WATER 失效
公开(公告)号：JPH06170379A
公开(公告)日：1994-06-21
申请号：JP34533192
申请日：1992-12-01
申请人： KURITA WATER IND LTD
发明人： OMI TADAHIRO , SATO SHIN , TAKADOI TADASHI
IPC分类号： C02F1/58
摘要： PURPOSE:To reduce the addition amt. of an alkali agent, in a case passing acidic fluorine-containing water through a tower packed with calcium carbonate particles to treat the same, by adding the alkali agent to the acidic fluorine- containing water and refluxing a part of the water flowing out of the tower to the acidic fluorine-containing water. CONSTITUTION:When acidic fluorine-containing water used in the etching process of a semiconductor manufacturing field or surface treatment field is treated, at first, the acidic fluorine-containing water is introduced into a raw water tank 1 and a proper amt. of an alkali agent and/or an alkali generating agent is added to the fluorine-containing water from an alkali agent or alkali generating agent storage tank 2 through a pump 3 to adjust the pH of the fluorine- containing water to about 2.0-7.0. Next, the fluorine-containing water in the raw water tank 1 is successively supplied to two granular calcium carbonate packed towers 5A,5B connected in series by a pump 4 to generate fluorine removing reaction. A part of the treated water flowing out of the packed tower 5B is returned to the raw water tank 1 to be used in the dilution of the fluorine- containing water to be treated and the remainder thereof is discharged from a treated water tank 6.

7. 发明专利

JPH0691281A TREATMENT OF ORGANIC WASTE WATER CONTAINING PHOSPHORUS 失效
公开(公告)号：JPH0691281A
公开(公告)日：1994-04-05
申请号：JP24186392
申请日：1992-09-10
申请人： OSAKA GAS CO LTD , KURITA WATER IND LTD
发明人： TSUKUDA YUTAKA , HARADA YOSHIAKI , YAMAZAKI KENICHI , YAMADA NOBORU , TAKADOI TADASHI , ETO YOSHIHIRO
IPC分类号： B01D19/00 , C02F1/20 , C02F1/58 , C02F1/74
摘要： PURPOSE:To treat a waste water efficiently at a low treatment cost by treating a water treated by wet type oxidation to remove carbonic acid and adding a calcium compound to the resulting waste water, regarding a treatment method which involves calcium compound addition after wet type oxidization treatment of organic waste water containing phosphorus and removal of phosphorus by making the phosphorus insoluble. CONSTITUTION:Raw water containing the substances to be oxidized and phosphorus is supplied to a wet type oxidation reaction tower 1, the substances are oxidized and decomposed, the resulting gas-liquid mixed solution is separated in a gas-liquid separating tower 2, and the gas is released to air and the separated liquid is sent to a carbonic acid removing tower 3. Carbonic acid is efficiently removed in the carbonic acid removing tower 3 and a calcium compound such as slaked lime, etc., is added to the resulting carbonic acid-removed water in a reaction tank 4 where phosphorus is made insoluble, and a part of SS is also returned from a solid-liquid separation tank 5 in a post stage. The slaked lime and carbonic acid-removed water are mixed and stirred in the reaction tank 4 and phosphorus is converted into hydroxyl apatite and thus becomes insoluble. Separation treatment is then carried out in a solid-liquid separation tank 5 and the supernatant water is discharged outside and a part of separated sludge is returned to the reaction tank 4 and the rest is discharged outside.

8. 发明专利

JPH0623371A TREATMENT OF ACIDIC FLUORINE-CONTAINING WATER 失效
公开(公告)号：JPH0623371A
公开(公告)日：1994-02-01
申请号：JP18239892
申请日：1992-07-09
申请人： KURITA WATER IND LTD
发明人： SATO SHIN , TAKADOI TADASHI
IPC分类号： C02F1/58
摘要： PURPOSE:To stably obtain treated water of high quality low in the concn. of fluorine by a method for insolubilizing fluorine contained in acidic fluorine- containing waste water as CaF2 by adding a calcium compd. to said waste water. CONSTITUTION:Acidic fluorine-containing waste water is introduced into a first reaction tank 1 to be reacted with the return sludge from a rear process and the obtained reaction solution is sent to a second reaction tank 2 where a calcium compd. and a pH controller are added to be subjected to solid-liquid separation and a part of separated sludge is returned to the first reaction tank 1 as return sludge. By reacting the return sludge with raw water prior to adding the calcium compd., the unreacted calcium compd. in sludge is efficiently eluted to raw water and the reaction of this calcium compd. and fluorine in raw water is smoothly advanced. By this constitution, the reduction of generated sludge and the enhancement of the purity of CaF2 are achieved and, as a result, the reduction of the addition amount of the calcium compd. to the second reaction tank, the reduction of the concn. of fluorine in obtained treated water and the stabilization of the quality of treated water.

9. 发明专利

JPH04197491A OZONE TREATMENT METHOD AND APPARATUS 失效
公开(公告)号：JPH04197491A
公开(公告)日：1992-07-17
申请号：JP32742990
申请日：1990-11-28
申请人： KURITA WATER IND LTD , MUNAKATA CHIKU SUIDOU KIGIYOUD
发明人： SATO SHIN , GOTO YUKIO , TAKADOI TADASHI , TODOROKI KAZUMA , ABE YOSHITERU
IPC分类号： C02F1/50 , C02F1/78
摘要： PURPOSE:To rapidly control the proper injection amount of ozone even when the quality of a solution to be treated is changed by calculating the pseudo- primary reaction speed constant K1 of the solution to be treated and controlling the injection amount of ozone on the basis of the calibration curve formed at every constant K1. CONSTITUTION:In an ozone reaction tower 1 where ozone-containing gas is brought into contact with a solution to be treated, the solution to be treated is supplied to a liquid supply passage 2 and discharged from a drain passage 3. Ozone-containing gas is supplied to the reaction tower 1 from an ozone generator 4 by an ozone injection pipe 5 and exhaust gas is discharged from the reaction tower 1 from an exhaust passage 6. Further, the concn. of ozone dissolved in the treated solution or the concn. of ozone in the exhaust gas is measured by ozone densitometers 9, 10, 13. Furthermore, a pseudo-primary reaction speed constant K is operated from the measured value by an operation apparatus 14. A control apparatus 17 controls the injection amount of ozone on the basis of the calibration curve showing the relation between the injection amount of ozone and the concn. of dissolved ozone or the concn. of exhaust ozone prepared at every constant K1.

10. 发明专利

JPH0326400A TREATMENT OF CONCENTRATED ORGANIC WASTE LIQUID 失效
公开(公告)号：JPH0326400A
公开(公告)日：1991-02-04
申请号：JP16136889
申请日：1989-06-23
申请人： OSAKA GAS CO LTD , KURITA WATER IND LTD
发明人： YAMADA NOBORU , TAKADOI TADASHI , TOSHIMA OSAMU , HARADA YOSHIAKI , YAMADA MITSUYA
IPC分类号： C02F1/74 , C02F1/52 , C02F11/08 , C02F11/14
摘要： PURPOSE:To reduce the reaction time, to stably and efficiently treat waste liq. and to obtain high-quality treated water at a low cost by flocculating the waste liq., separating solid and liq. and subjecting the separated liq. to wet catalytic oxidation. CONSTITUTION:The waste water as a raw liq. having a high content of org. matter and obtained by crushing night soil and/or septic tank sludge, etc., is firstly added with a flocculant and directly flocculated. The flocculated water is then subjected to solid-liq. separation. The separate liq. is introduced into a wet catalytic oxidation tower 2. A pipeline 13 for supplying an oxygen-contg. gas such as air provided with a compressor C is connected to an inlet pipeline 12, the oxygen-contg. gas is blown into the raw liq. to be subjected to wet catalytic oxidation, and the liq. is introduced into the oxidation tower 2 and oxidized in the presence of catalyst. The liq. is stably treated in a short time by this method, and high-quality treated water is efficiently obtained at a low cost.

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