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41. 发明专利

JPH09314130A TREATMENT METHOD FOR BORON-CONTAINING WATER 失效
公开(公告)号：JPH09314130A
公开(公告)日：1997-12-09
申请号：JP13360696
申请日：1996-05-28
申请人： KANSAI ELECTRIC POWER CO , ELECTRIC POWER DEV CO , KURITA WATER IND LTD
发明人： YAMASHITA NAOYUKI , OKA ATSUO , TOYAMA KOJI , SHIRAKATA TADASHI , HARUNA YASUTOSHI , MUTO KENICHI , ETO YOSHIHIRO , YAMADA RYOICHI , ASADA HIROYUKI , HORII SHIGEKI
IPC分类号： C02F1/42 , C02F1/26 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To enable the efficient crystallization and recovery of boron by using a stripping agent of at least specification as the stripping agent when an extractant which extracted boron is contacted with the stripping agent to strip off boron. SOLUTION: Raw water containing boron is supplied to an ion exchange column 1 from piping 11 to be contacted with an ion exchange resin, and the treated water is discharged from piping 12. Besides, regenerated waste liquid from the ion exchange column is supplied into an extraction column 2 from piping 14 and contacted with an extractant introduced from piping 15 to extract and to remove boron. The extractant which extracted boron is supplied to a stripping column 3 and contacted with a stripping agent from piping 19 to strip off and to remove boron. In this process, an alkaline aqueous solution which is prepared by a process in which the stripping agent after a process in which boron compound crystals are crystallized and recovered in a crystallization tank 5 is added with alkali from piping 21 in a pH adjustment tank 4 to adjust pH at least 12.5 is used as the stripping agent.

42. 发明专利

JP2002086161A TREATMENT OF SELENIUM-CONTAINING WATER 失效
公开(公告)号：JP2002086161A
公开(公告)日：2002-03-26
申请号：JP2000283835
申请日：2000-09-19
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： TAKANISHI KAZUMITSU , UMAZUME YOICHIRO , ASADA TOMOYUKI , TANAKA REINA , ASADA HIROYUKI , ETO YOSHIHIRO
IPC分类号： C02F1/58 , C02F1/70
摘要： PROBLEM TO BE SOLVED: To reduce a chemical use quantity, to reduce a required iron elution quantity and to remove selenium as far as sufficient low concentration, in a treatment method of selenium-containing waste water by which the selenium- containing waste water is added acid and is passed through an iron metal filled layer, and then pH is made to alkaline and selenium is separated from the liquid as co-precipitate with iron hydroxide. SOLUTION: This treatment method of selenium-containing water consists of a first process by which the selenium-containing water is brought into contact with iron metal under an acidic condition and a second process by which outflow water from the first process is made to alkaline to make insoluble matter containing selenium and separate this from the liquid. In this method, the temperature of the first process is 40-90 deg.C.

43. 发明专利

JP2002011482A METHOD OF TREATING WATER CONTAINING SELENIUM 失效
公开(公告)号：JP2002011482A
公开(公告)日：2002-01-15
申请号：JP2000194846
申请日：2000-06-28
申请人： KURITA WATER IND LTD
发明人： ASADA HIROYUKI , ETO YOSHIHIRO
IPC分类号： C02F1/58 , C02F1/70
摘要： PROBLEM TO BE SOLVED: To provide a method of treating water containing selenium, by which the selenium is efficiently removed with a small amount of a reagent used and a small elution amount of iron. SOLUTION: In a method of treating water containing selenium, where an operation of adding an acid to the water containing the selenium and bringing the acid-added water into contact with iron metal is repeated twice or more times and a method of treating water containing selenium, where the water containing the selenium is acidified to be passed through a layer filled with iron metal, the acid is poured into at least one part on the way of the flow passage in the layer filled with the iron metal.

44. 发明专利

JP2001239273A METHOD OF TREATING WATER CONTAINING BORON AND FLUORINE 失效
公开(公告)号：JP2001239273A
公开(公告)日：2001-09-04
申请号：JP2000060420
申请日：2000-03-01
申请人： KURITA WATER IND LTD
发明人： ETO YOSHIHIRO , SATO TAKESHI , ASADA HIROYUKI
IPC分类号： C02F1/58 , C02F1/52
摘要： PROBLEM TO BE SOLVED: To provide a method of treating water containing boron and fluorine, in which boron and fluorine are subjected to an advanced treatment and removed with a high removal rate and by which the amount of a reagent to be used can be reduced by utilizing magnesium and subjecting water containing boron and fluorine to the advanced treatment when the magnesium is contained in the water to be treated. SOLUTION: Water 11 containing boron and fluorine, an aluminum compound 12, a calcium compound 13 and a pH-controlling agent 14 are introduced into a first reaction tank 1 and then insoluble deposits are deposited by adjusting pH to a value of >=9. The reaction liquid thus obtained is separated into solid and liquid at a first solid-liquid separating tank 2. After sending the separated liquid 17 to a second reaction tank 3, a magnesium compound 18 and a pH-controlling agent 19 are added and insoluble deposits are deposited by adjusting pH to a value of >=9.5, and the reaction liquid 20 is separated into solid and liquid at a second solid-liquid separating tank 4. A portion of the separated sludge of the first solid-liquid separating tank 2 is neutralized in a neutralization tank 5 by adding an acid 25. The neutralized sludge is dehydrated with a dehydrator 6, and the separated liquid 27 is used as the magnesium compound 18.

45. 发明专利

JP2001232372A TREATMENT PROCESS FOR WATER CONTAINING BORON 失效
公开(公告)号：JP2001232372A
公开(公告)日：2001-08-28
申请号：JP2000048972
申请日：2000-02-21
申请人： KURITA WATER IND LTD
发明人： ETO YOSHIHIRO , SATO TAKESHI , ASADA HIROYUKI
IPC分类号： C02F1/42 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To provide a boron-containing water treatment process which enables efficient boron removal in a high removal ratio with lesser chemical consumption, reduction in amount of sludge generated, reduction in boron elution even when the sludge is neutralized, boron removal in a higher removal ratio by combinedly using ion-exchange resin and also, efficient treatment of a regeneration waste liquid with respect to the ion-exchange resin. SOLUTION: This treatment process comprises introducing boron-containing water 11, an aluminum compound 12, a calcium compound 13 and a pH-adjusting agent 14 into a reaction vessel 1, to separate an insoluble precipitate at a pH of >=9, subjecting the liquid reaction mixture thus obtained to solid-liquid separation in a solid-liquid separation vessel 2, returning a part of the resulting separated sludge to the reaction vessel 1 as return sludge 19 and introducing the remainder of the separated sludge into a neutralization vessel 3 as withdrawn sludge 20 to neutralize the withdrawn sludge 20, dehydrating the neutralized sludge in a dehydration vessel 4 and returning a separated liquid 25 in the dehydration vessel 4 to the reaction vessel 1, introducing a separated liquid 26 in the solid-liquid separation vessel 2 into an ion-exchange vessel 5, subjecting the separated liquid 26 to ion exchange with anion- exchange resin 27, and further, introducing an acidic regeneration waste liquid 29 discharged from the ion-exchange vessel 5 into the neutralization vessel 3 to neutralize the waste liquid 29.

46. 发明专利

JP2000176439A METHOD OF EXTRACTING BORON 失效
公开(公告)号：JP2000176439A
公开(公告)日：2000-06-27
申请号：JP36108798
申请日：1998-12-18
申请人： ELECTRIC POWER DEV CO , KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： NOGUCHI YOSHIKAZU , MUTO KENICHI , TOYAMA KOJI , YAMASHITA NAOYUKI , ASADA HIROYUKI , ETO YOSHIHIRO
IPC分类号： C02F1/26 , B01D11/04
摘要： PROBLEM TO BE SOLVED: To perform stable and effective stripping and crystallization in respect to variation in boron concentration of solvent by measuring pH of stripping agent after contact with solvent and controlling the fed quantity of the stripping agent according to the value thereof. SOLUTION: A pipeline for feeding stripping agent after stripping to a crystallizer 3 from a backward extractor 1 is provided with a pH meter 5 to measure pH. Based on this result, the operation of a pump P2 for feeding stripping agent to a backward extractor 1 from the extractor 2 is controlled. Since when pH of the stripping agent after stripping is lower than the predetermined pH value, boron concentration in the solvent is high and the stripping agent quantity runs short, the fed quantity of the stripping agent to the backward extractor 1 is increased. On the contrary, since when pH of the stripping agent after stripping is higher than the predetermined pH value, boron concentration in the solvent is low and the quantity of the stripping agent becomes excessive, by increasing or decreasing the fed quantity of the stripping agent to the stripping, pH of the stripping agent after stripping is kept at a suitable pH value.

47. 发明专利

JPH11226302A WASTEWATER TREATMENT METHOD 失效
公开(公告)号：JPH11226302A
公开(公告)日：1999-08-24
申请号：JP3011998
申请日：1998-02-12
申请人： KURITA WATER IND LTD
发明人： ETO YOSHIHIRO , ASADA HIROYUKI
IPC分类号： C02F1/04 , B01D9/02 , C02F1/58 , C02F1/62
摘要： PROBLEM TO BE SOLVED: To significantly lessen the amount of waste and to efficiently treat wastewater containing salts by a simple apparatus and simple operation. SOLUTION: After raw water 11 containing salts is concentrated by an evaporation apparatus 1 for concentration, the resultant raw water is further concentrated by an evaporation apparatus 2 for crystallization to precipitate salt crystals. The obtained suspended liquid is solid-liquid separated by a solid-liquid separation apparatus. The separated liquid 21 is turned back to the evaporation apparatus 1 for concentration and a part of the liquid is discharged out of a discharging route 22 and treated for purification. On the other hand, the salt crystals 17 are dissolved in a dissolution tank 4 and then released.

48. 发明专利

JPH11653A EXTRACTION METHOD 失效
公开(公告)号：JPH11653A
公开(公告)日：1999-01-06
申请号：JP15666597
申请日：1997-06-13
申请人： ELECTRIC POWER DEV CO , KURITA WATER IND LTD , KANSAI ELECTRIC POWER CO
发明人： YAMASHITA NAOYUKI , TOYAMA KOJI , SHIRAKATA TADASHI , MUTO KENICHI , ASADA HIROYUKI , YAMADA RYOICHI , HORII SHIGEKI , ETO YOSHIHIRO
IPC分类号： C02F1/26 , C02F5/00
摘要： PROBLEM TO BE SOLVED: To prevent scale hindrance from occurring and enhance stability and efficiency by adding a same kind of or a different kind of an extractant to an extractant from which back extraction of an object substance has been carried out and separating the added extractant before the extractant is returned to an extraction part. SOLUTION: An extractant from which an object substance has been extracted is fed from an extraction tank 1 to a back extraction tank 2 comprising a mixer part and a settler part through a pipe 14 in order to carry out back extraction. A back extractant which has been subjected to back extraction is transferred to a precipitation tank 3 and an object substance is precipitated and taken out from a pipe 17. The back extractant after precipitation is returned to the back extraction tank 2 via a back extractant storage tank 5 and pipes 18, 15. A same kind of or a different kind of a second back extractant is added to the extractant which has been treated in the back extractant tank 2 via a pipe 19 and sent to an agitation/separation tank 4 and residual object substances are separated. The extractant after treatment is returned to the extraction tank 1 through a pipe 12 and the second back extractant after treatment is transferred to the back extractant storage tank 5 through a pipe 22 for use or is discharged through a pipe 23. By this method, production of scale is avoided even if operation is continued for about 300 hours.

49. 发明专利

JPH0910775A TREATMENT OF FLUORIDE ION-CONTAINING WATER 失效
公开(公告)号：JPH0910775A
公开(公告)日：1997-01-14
申请号：JP16773595
申请日：1995-07-03
申请人： KANSAI ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： TOYAMA KOJI , SUMIMURA TAKUSHI , ETO YOSHIHIRO , SATO YUKIHIRO , YAMADA RYOICHI , ASADA HIROYUKI
IPC分类号： C02F1/04 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To recover water in a utilizable state and to efficiently and highly remove fluoride ions by a reduced amt. of a chemical agent. SOLUTION: A Ca salt 6 and/or an Al salt 7 are added to fluoride ion- containing water 6 in a first reaction tank 1 to adjust the pH of the water 6 to 5-8 to form a precipitate which is, in turn, subjected to solid-liquid separation in a solid-liquid separation tank 2 to discharge sludge 11. The outflow liquid 12 is evaporated in an evaporation apparatus 3 to recover water 13 while the concentrate 14 is introduced into a second reaction tank 4 and adjusted in pH by the addition of a polyvalent metal salt 15 to form a precipitate which is, in turn, subjected to solid-liquid separation in a solid-liquid separation tank 5 to discharge treated water 19 and, when sludge 20 is returned to the first reaction tank 1, a part of the sludge 20 is circulated to the second reaction tank 4.

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