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1. 发明专利

JP2003181472A METHOD FOR TREATING MERCURY-CONTAINING WASTE WATER 审中-公开
公开(公告)号：JP2003181472A
公开(公告)日：2003-07-02
申请号：JP2001387750
申请日：2001-12-20
申请人： KURITA WATER IND LTD , ELECTRIC POWER DEV CO
发明人： MURAKAMI TAKAFUMI , HATTA TAKESHI , NAKUI HIROYUKI , HIRABAYASHI KOYO , HIROTA YASUNORI , MUTO KENICHI
IPC分类号： C02F1/04 , C02F1/62 , C02F1/70
摘要： PROBLEM TO BE SOLVED: To provide a method for treating mercury-containing waste water in which mercury in acidic waste water can be reduced, vaporized and recovered as metal mercury and no mercury-containing sludge is produced. SOLUTION: In the method for treating mercury-containing waste water, acidic mercury-containing waste water is heated, hypophosphorous acid or a salt thereof is added to the waste water to reduce mercury and then the waste water is aerated to vaporize and separate mercury from the waste water. COPYRIGHT: (C)2003,JPO

2. 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.

3. 发明专利

JP2000176438A EXTRACTION METHOD 失效
公开(公告)号：JP2000176438A
公开(公告)日：2000-06-27
申请号：JP36108898
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 stably and effectively perform a series of treatments from extraction to crystallizing recovery in by response to a variation in object concentration in water to be treated by adjusting a pH value of stripping agent before stripping based on a pH value after stripping. SOLUTION: A pipeline for feeding stripping agent in which boron has been back extracted in a stripping 3 to a crystallizer 4 is provided with a pH meter 4A to measure pH. And pH of the stripping agent before backward extraction is determined so that pH of stripping agent after backward extraction becomes a predetermined pH value. Based on this result, the operation of a chemical injection pump P2 is controlled. When pH of the stripping agent after stripping for adjusting the added quantity of alkali to a pH adjusting tank 2 is lower than a predetermined pH value, the fed quantity of alkali to the pH adjusting tank 2 is increased so that pH of the stripping agent is raised, and on the contrary, when pH of the stripping agent after backward extraction is higher than the predetermined pH value, the fed quantity of alkali to the pH adjusting tank 2 is reduced so that pH of the stripping agent is lowered. In this way, by increasing or decreasing the fed quantity of alkali, pH of the stripping agent before stripping is adjusted.

4. 发明专利

JPH09290297A TREATMENT OF WASTE WATER FROM THERMAL ELECTRIC POWER PLANT 失效
公开(公告)号：JPH09290297A
公开(公告)日：1997-11-11
申请号：JP13089096
申请日：1996-04-26
申请人： ELECTRIC POWER DEV CO , KURITA WATER IND LTD
发明人： TSUBOYA HISAO , WATANABE TSUKASA , MUTO KENICHI , OGOSE TSUTOMU , TSURUMARU AKIYOSHI
IPC分类号： C02F3/34 , C02F1/52
摘要： PROBLEM TO BE SOLVED: To effectively remove the harmful matter, especially selenium, contained in the waste water from a thermal electric power plant by bringing the waste water with the pH specified into contact with iron, conducting flocculation and solid-liq. separation and then biologically denitrifying the waste water. SOLUTION: The waste water from a thermal electric power plant contg. such oxidative matter as iodic acid and selenic acid is introduced into a pH regulating tank 1, controlled to

5. 发明专利

JPH11695A METHOD FOR TREATMENT OF FLUORINE AND BORON-CONTAINING WATER 失效
公开(公告)号：JPH11695A
公开(公告)日：1999-01-06
申请号：JP15666397
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 , YAMADA RYOICHI , ASADA HIROYUKI , ETO YOSHIHIRO
IPC分类号： C02F1/28 , C02F1/04 , C02F1/42 , C02F1/52 , C02F1/58 , C02F9/00
摘要： PROBLEM TO BE SOLVED: To remove effectively fluorine and boron, by a method wherein fluorine and boron are removed and boronic fluoride is decomposed by successively executing processes in which raw material is brought in contact with ion exchange resin having performance for selectively adsorbing boron, concentrated by heating, and treated under existence of multi-valent metal ion. SOLUTION: Raw water containing fluorine, boron, and boronic fluoride is introduced into a pH adjusting tank, NaOH or the like is added, pH is adjusted at 7 or higher, which is sent to a boron adsorption tower 2, and brought in contact with ion exchange resin adsorbing selectively boron. Boron is removed thereby, and borofluoride is decomposed. Then, after making pH acidic with a pH adjusting tank 3, it is concentrated with an evaporation tower 4 to recover distilled water, and the residual boric fluoride is decomposed. Concentrated water is sent to an aggregation tank 5, adjusted to neutrality or higher under existence of multi-valent metal such as Ca or the like, and fluorine is made multi-valent metal salt, which is removed by separation with a precipitation tank 6. Thus, industrial waste water containing fluorine, boron, and borofluoride can be effectively treated.

6. 发明专利

JPH11652A METHOD OF TREATING BORON-CONTAINING WATER 失效
公开(公告)号：JPH11652A
公开(公告)日：1999-01-06
申请号：JP15666497
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 , C01B35/02 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To raise back extraction efficiency and extraction efficiency by using an aqueous alkaline solution as a back extractant and back-extracting the extractant after boron extraction at a predetermined temperature or higher. SOLUTION: An extractant which has extracted boron from an extraction tank 1 is fed as a back extractant to a back extraction tank 2 equipped with a mixer part and a settler part at a rate of about 42 L/hr. An aqueous NaOH solution having a pH of about 13 is simultaneously fed at a rate of about 10.5 L/hr in order to carry out back extraction. The extractant after back extraction is returned to an extraction process through pipes 16, 12 and is recirculated for use. At this time, the back extractant fed to the back extraction tank 2 is heated so as to raise temperature in the back extraction tank to 20 deg.C or higher. The back extractant after back extraction is transferred to a precipitation tank 3 and is cooled to about 23 deg.C or lower to precipitate boron, which is then taken out from a pipe 18. The back extractant is returned to the back extraction tank 2 via a pipe 19, a heating means 4 and a pipe 15 and is recycled for use. By this process, efficiency of extraction, back extraction and precipitation is raised.

7. 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.

8. 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.

9. 发明专利

JPH09290299A TREATMENT OF WASTE WATER FROM THERMAL ELECTRIC POWER PLANT 失效
公开(公告)号：JPH09290299A
公开(公告)日：1997-11-11
申请号：JP13089196
申请日：1996-04-26
申请人： ELECTRIC POWER DEV CO , KURITA WATER IND LTD
发明人： TSUBOYA HISAO , WATANABE TSUKASA , MUTO KENICHI , OGOSE TSUTOMU , TSURUMARU AKIYOSHI
IPC分类号： C02F1/58 , C02F9/00
摘要： PROBLEM TO BE SOLVED: To efficiently remove selenium (VI) in a waste water from a thermal electric power plant by applying flocculation, settling and biological denitrification to the waste water, regulating the water by injecting hydrochloric acid, bringing the water into contact with iron and further subjecting the water to flocculation, settling and solid-liq separation. SOLUTION: The waste water from a thermal electric power plant added with a flocculant is agitated, then the formed floc is settled and separated, and most of the SS and heavy metal in the water are removed. The water is then aerobically nitrated and anaerobically denitrified. The water is further subjected to solid-liq. separation in a settling tank 8, hydrochloric acid is injected into the denitrified water in a pH regulating tank 9 to control the water to

10. 发明专利

JPH10249392A TREATMENT OF WASTE WATER 失效
公开(公告)号：JPH10249392A
公开(公告)日：1998-09-22
申请号：JP7649997
申请日：1997-03-12
申请人： MITSUBISHI HEAVY IND LTD , ELECTRIC POWER DEV CO
发明人： OKAZOE KIYOSHI , OCHI EIJI , NAGAYASU TATSUTO , KANEKO MASAHITO , OGUSHI YASUYUKI , OKINO SUSUMU , HINO MASAO , TAKAKURA MITSUAKI , MUTO KENICHI , TAKAGI KENJI , HARUNA YASUTOSHI , MIYAGATA TEIJI
IPC分类号： C02F3/12 , C02F3/34
摘要： PROBLEM TO BE SOLVED: To provide the method for treating waste water by which the nitrogen and selenium (especially Se(VI)) in the waste water are effectively removed, the elution standard of Se, etc., are observed at alow cost, and the Se is more efficiently removed by setting the treating condition. SOLUTION: At least nitrogen and Se(VI) are removed from the waste water contg. nitrogen and Se by the biological treatment using the sludge contg. at least a denitrification microorganism and a microorganism capable of reducing Se(VI) to Se(IV) and/or elemental Se. In this waste water treating method, the org. matter as the nutritive source of the microorganism in activated sludge is added to a biological treating tank 12 in excess of the denitrification equivalent by >=5mg/l.hr.

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