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1. 发明专利

JPH10137542A TREATMENT OF FLUE GAS DESULFURIZATION WASTE WATER 失效
公开(公告)号：JPH10137542A
公开(公告)日：1998-05-26
申请号：JP32219796
申请日：1996-11-18
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： FUJITA HIROYUKI , ABE KEIKO , MATSUTANI NAOKI , TAKADOI TADASHI , SATO TAKESHI , CHIKASAWA KIYOHITO
IPC分类号： B01D53/50 , B01D53/77 , B01D65/06 , C02F1/44 , C02F9/00
摘要： PROBLEM TO BE SOLVED: To decrease the frequency of the exchange of a membrane by cleaning the membrane, soiled by the continuation of treatment, with a cleaning solution containing oxalic acid to improve the recovering ratio of the membrane by cleaning and to prolong the period for executing chemical cleaning. SOLUTION: At first an alkali cleaning solution in an alkali storage tank 9 is supplied to the water permeating side of a membrane separation device 6 by driving a pump 11, returned to the alkali storage tank 9 through a pipe line and circulated for a fixed time. Next, the alkali cleaning solution is fed to the concentrated water side and circulated. After that, the cleaning solution is switched to an acid cleaning solution, the acid cleaning solution in an acid storage tank 10 is circulated between the acid storage tank 10 and the membrane separation device 6 in the same manner to clean the membrane. By cleaning in this way, the membrane-soiling material specific to the flu gas desulfurization waste water is removed and the membrane performance is recovered. And a cleaning waste water generated by the cleaning of the membrane is treated without providing an additional waste water treating device by using the treating process of the flue gas desulfurization waste water.

2. 发明专利

JPH10137770A TREATMENT OF WASTE WATER CONTAINING SULFURIC ACID 失效
公开(公告)号：JPH10137770A
公开(公告)日：1998-05-26
申请号：JP30473796
申请日：1996-11-15
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： FUJITA HIROYUKI , NIHEI MIKIO , CHIKASAWA KIYOHITO , TAKADOI TADASHI , SATO TAKESHI
IPC分类号： C02F1/44 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To prevent reduction in membrane flux due to clogging, breakage, etc., of membranes, to stabilize the treatment and to improve efficiency of the treatment by adding a calcium compound to waste water contg. sulfuric acid in two stages, i.e., in a first stage and a second stage respectively to adjust pH of the waste water to specified values in the first and second stages respectively, subjecting insoluble matter thus formed in the resulting water to membrane separation to obtain permeant water and discharging the permeant water to the outside of the treatment system as treated water. SOLUTION: In the system of this treatment, waste water contg. sulfuric acid is introduced into a first reaction vessel 1 fitted with a pH meter IA and thereafter, a calcium compound such as Ca(OH)2 , or the like is added to the waste water to adjust the pH to 4 to 6, or preferably, about 4.5 to 5.5. Then, this waste water is further introduced into a second reaction vessel 2 fitted with a pH meter 2A and similarly, a calcium compound is added to the waste water to adjust the pH to 6.5 to 8. The resulting water is treated with a circulation vessel 3 and a membrane module 5, to obtain membrane permeant water. The permeant water is transferred to a permeant water tank 6 for backwashing to discharge the permeant water from the tank 6 to the outside of the system as treated water. By performing the addition of a calcium compound to waste water contg. sulfuric acid and the adjustment of pH of the waste water in two stages, the dissolution amounts of scale-forming components can sufficiently be reduced and also, deposition of coarse particles can be prevented from occurring. Thus, trouble due to scale formation, membrane breakage, etc., can be prevented from being caused.

3. 发明专利

JPH0929267A TREATMENT METHOD FOR MANGANESE-CONTAINING WASTEWATER 失效
公开(公告)号：JPH0929267A
公开(公告)日：1997-02-04
申请号：JP18706595
申请日：1995-07-24
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： ISHIYAMA KAZUHIRO , SASAKI YU , TAKADOI TADASHI , CHIKASAWA KIYOHITO , MITA MASAICHIRO , SATO TAKESHI
IPC分类号： C02F1/64
摘要： PROBLEM TO BE SOLVED: To stably and efficiently treat manganese-containing wastewater, e.g. flue gas desulfurization wastewater, by making manganese insoluble by adding a permanganate to the manganese-containing wastewater and then insolubilizing the remaining permanganate by adding a sulfur-containing compound and successively separating insoluble substances by solid-liquid separation. SOLUTION: Manganese-containing wastewater, e.g. flue gas wastewater, is led to an adjustment tank 1, pH of the wastewater is adjusted to be 8.0-9.5 by adding an alkali such as NaOH and, at the same time, air aeration is carried out by an air bubbling pipe 13. Next, the wastewater flowing out of the adjustment tank 1 is led to a first reaction tank 2 and fluorine is converted into an insoluble substance by adding a permanganate, e.g. KMnO4 , or an aluminum compound, an alkali, etc., and adjusting pH to about 6.0-7.5. After that, the resultant wastewater flowing out of the first reaction tank 2 is led to a second reaction tank 3 and the permanganate is converted into an insoluble substance by adding a sulfur-containing compound. The obtained wastewater flowing out of the second reaction tank 3 is then led to a membrane separation apparatus 5 through a circulation tank 4 and a pump P and the insoluble substances are separated and removed.

4. 发明专利

JPH1110151A TREATMENT EQUIPMENT FOR SULFURIC ACID ION CONTAINING WASTE WATER 失效
公开(公告)号：JPH1110151A
公开(公告)日：1999-01-19
申请号：JP16239697
申请日：1997-06-19
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： SASAKI YU , NIHEI MIKIO , FUJITA HIROYUKI , CHIKASAWA KIYOHITO , TAKADOI TADASHI , SATO TAKESHI
IPC分类号： B01D53/34 , B01D53/50 , B01D53/77 , B04C9/00 , C02F1/44 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To prevent the deterioration of a membrane by a cyclone for removing bulky particles out of insoluble matter containing water and flowing the insoluble matter containing water through the cyclone by the liquid transfer force of a pump in the case of membrane separation of insoluble matters provided by adding a calcium compound into sulfuric acid ion containing waste water. SOLUTION: Sulfuric acid ion containing waste water (raw water) is introduced into a flocculation reaction tank 1, and slaked lime is added therein and adjusted to pH 4-8 to separate sulfuric acid ions in raw water as gypsum. Insoluble matter containing water flowed out of the flocculation reaction tank 1 is passed through a circulating tank 2 and transferred to a membrane module 4 by a circulating pump 3, and solid-liquid separated by the cross flow filtration, and permeated water is discharged as treated water. On the other hand, a part of condensed water is returned to the flocculation reaction tank l and a remaining part is circulated into the circulating tank 2, and a cyclone 5 is provided on a circulating piping of the tank, and bulky particles in the condensed water are removed by the cyclone 5. Condensed water is flowed into the cyclone 5 by the liquid transfer force of the circulating pump 3 at the flow rate required for revolution.

5. 发明专利

JPH0929253A METHOD FOR PROCESSING SULFURIC ACID-CONTAINING DRAIN WATER 失效
公开(公告)号：JPH0929253A
公开(公告)日：1997-02-04
申请号：JP18706995
申请日：1995-07-24
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： ISHIYAMA KAZUHIRO , SASAKI YU , TAKADOI TADASHI , CHIKASAWA KIYOHITO
IPC分类号： C02F1/44 , C02F1/58 , C02F1/66
摘要： PROBLEM TO BE SOLVED: To prevent a membrane from clogging and breaking when insoluble substances formed by adding a calcium compd. into a sulfuric acid-contg. drain water is processed by means of membrane separation. SOLUTION: Ca(OH)2 is added in the first reaction tank 1 to make pH to be 4.0-6.0, and Ca(OH)2 is also added in the second reaction tank 2 to make pH to be 6.5-8.5, and then, MF or UF membrane separation processing is performed. In addition, by making pH to be 4.0-6.0 in the first reaction tank 1, crystalline particles with an appropriate size can be deposited under an appropriate reaction speed to prevent the membrane from being damaged. By making pH to be 6.5-8.0 in the reaction tank 2, unreacted scale component can be efficiently deposited to prevent the scale from being deposited on the membrane surface. Clogging and trouble caused by scale of the membrane are avoided to be able to keep stably the flux of the membrane for a long time. Frequency of cleaning with chemicals becomes less to decrease cost of chemicals. The life of the membrane becomes longer and the frequency of exchange of the membrane becomes less and the cost of the membrane is decreased. Operational efficiency of the apparatus is also improved.

6. 发明专利

JPH0929072A BACKWARD WASHING METHOD OF MEMBRANE FILTER APPARATUS 失效
公开(公告)号：JPH0929072A
公开(公告)日：1997-02-04
申请号：JP18706695
申请日：1995-07-24
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： ISHIYAMA KAZUHIRO , SASAKI YU , TAKADOI TADASHI , CHIKASAWA KIYOHITO
IPC分类号： B01D53/34 , B01D53/50 , B01D53/77 , B01D65/02
摘要： PROBLEM TO BE SOLVED: To stabilize flux over a long period of time by pressurizing the interior of a treated water storage tank so as to make the pressure therein higher than that in a chamber of water to be treated at a time of the backward washing of a membrane filter apparatus to introduce the treated water in the treated water storage tank into a treated water chamber to allow the same to flow backward to the chamber of water to be treated to backward wash a filter membrane. SOLUTION: Exhaust gas desulfurization waste water is introduced into a circulating tank 2 from a reaction 1 through a piping 12 to be subjected to dehydration treatment. Next, the liquid in the circulating tank 2 is introduced into a chamber 3a of water to be treated of a membrane filter apparatus 3 and the treated water transmitted through a filter membrane 3A is discharged out of the system from a treated water chamber 3b through a piping 15, a treated water storage tank 4 and a piping 16. In backward washing operation, the treated water storage tank 4 is filled with treated water and a compressor 5 is operated to raise the pressure in the treated water storage tank 4 so as to make the same high than that in the chamber 3a of water to be treated. The pressurized water in the treated water storage tank 4 is introduced into the membrane filter apparatus 3 and treated water is allowed to flow backward from the treated water chamber 3b to the chamber 3a of water to be treated to backward wash the filter membrane 3A.

7. 发明专利

JPH11197459A MEMBRANE FILTER APPARATUS 失效
公开(公告)号：JPH11197459A
公开(公告)日：1999-07-27
申请号：JP853998
申请日：1998-01-20
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： SATO TOSHIRO , NIHEI MIKIO , FUJITA HIROYUKI , SATO TAKESHI , CHIKASAWA KIYOHITO
IPC分类号： B01D61/18 , B01D61/20 , B01D65/02
摘要： PROBLEM TO BE SOLVED: To enable long-term continuous operation by preventing the generation of the pulsating flow of raw water at a time of backwashing causing the damage of a membrane in a membrane filter apparatus introducing backwashing water from a permeated water side under pressure while continuing the passage of raw water. SOLUTION: In a membrane filter apparatus intermittently introducing the backwashing water of a backwashing tank W into the permeated water sides of membrane modules M1 , M2 and M3 by opening backwashing valves V10 , V20 and V30 while continuing the supply of raw water to perform backwashing, automatic valves V12 , V22 and V32 are provided to conc. water discharge lines and opened during a period when backwashing water is introduced into the membrane modules M1 , M2 , M3 under pressure to discharge conc. water.

8. 发明专利

JPH1110196A METHOD FOR TREATING WASTEWATER OF THERMOELECTRIC POWER PLANT 失效
公开(公告)号：JPH1110196A
公开(公告)日：1999-01-19
申请号：JP16239797
申请日：1997-06-19
申请人： TOHOKU ELECTRIC POWER CO , KURITA WATER IND LTD
发明人： SATO TOSHIRO , HORI YOJI , FUJITA HIROYUKI , CHIKASAWA KIYOHITO , TAKADOI TADASHI , SATO TAKESHI
IPC分类号： C02F1/44 , C02F1/52 , C02F9/00
摘要： PROBLEM TO BE SOLVED: To prevent a lowering of membrane flux by a method wherein when a normal-wastewater treatment is changed over to an abnormal-wastewater treatment, pH of coagulation treatment is adjusted to a specific value, and when pH of water supplied to a membrane separation device becomes a specific value, an adjustment is made so that the concentration of ferrous ions of water becomes a specific value or higher. SOLUTION: Wastewater of a thermoelectric power plant is introduced into a coagulation reaction tank 1 so as to be subjected to a coagulation treatment under conditions that pH adjusting agents and flocculants are added to the wastewater, and the resulting coagulated liquid is led to a membrane separation device 3 through a circulation tank 2 to obtain treated water. In such treatment method, when a treatment in which wastewater of the power plant contains relatively small amount of primary ferrous ions is changed over to a treatment in which the wastewater contains relatively large amount of primary ferrous ions, pH of coagulation treatment is adjusted to 8-9. And when pH of water supplied to the device 3 becomes 8-9, an adjustment is made so that the concentration of primary ferrous ions of water becomes 100 mg/L or more. Thus membrane flux can be prevented from falling.

9. 发明专利

JP2003080282A Water treatment equipment and method for cleaning wastewater from biomembrane filtration equipment 有权
标题翻译：水处理设备和从生物膜过滤设备清洗废水的方法
公开(公告)号：JP2003080282A
公开(公告)日：2003-03-18
申请号：JP2001273778
申请日：2001-09-10
申请人： Ebara Corp , Hitachi Metals Ltd , Japan Institute Of Wastewater Engineering Technology , Kubota Corp , Kurita Water Ind Ltd , Ngk Insulators Ltd , 日本碍子株式会社 , 日立金属株式会社 , 栗田工業株式会社 , 株式会社クボタ , 株式会社荏原製作所 , 財団法人下水道新技術推進機構
发明人： KATAGIRI AKIRA , CHIKASAWA KIYOHITO , TAKEDA SEIICHIRO , MATSUBAYASHI YOSHIKI , TAKEDA SHIGEKI , YAMADA YUJI
IPC分类号： C02F3/06 , C02F1/52 , C02F3/08
CPC分类号： Y02W10/15
摘要： PROBLEM TO BE SOLVED: To easily and efficiently perform solid-liquid separation by enhancing sludge sedimation property of cleaning wastewater discharged from biomembrane filtration equipment. SOLUTION: The biomembrane filtration equipment 10 in which a membrane 13 is formed, is washed with water. The wastewater discharged from the biomembrane filtration equipment 10 is subjected to the solid-liquid separation in an initial sedimentation tank 20 after air is diffused in a cleaning wastewater storage tank 40 by using an air diffuser 41 and oxygen-containing gas is supplied thereto. When the oxygen-containing gas is supplied to the cleaning wastewater, the sludge contained in the cleaning wastewater is changed into a flock having good sedimentation property by dissolved oxygen in the cleaning wastewater, and the solid-liquid separation is improved.
摘要翻译：要解决的问题：通过增加从生物膜过滤设备中排出的清洁废水的污泥沉淀性能，容易且有效地进行固液分离。解决方案：其中形成膜13的生物膜过滤设备10用水洗涤。在通过使用空气扩散器41将空气扩散到清洗废水储存箱40中并在其中供给含氧气体之后，将来自生物膜过滤设备10的废水在初始沉淀池20中进行固液分离。当将含氧气体供应到清洗废水时，清洗废水中含有的污泥通过溶解氧在清洗废水中变成具有良好沉降特性的鸡群，提高了固液分离。

10. 发明专利

JP2001327992A ORGANIC WASTEWATER TREATMENT METHOD 失效
公开(公告)号：JP2001327992A
公开(公告)日：2001-11-27
申请号：JP2000151444
申请日：2000-05-23
申请人： SAITAMA PREFECTURE , KURITA WATER IND LTD , NGK INSULATORS LTD , HITACHI METALS LTD
发明人： HARADA SHOJI , UCHINO YOZO , MATSUMOTO KENICHI , KOBAYASHI MASARU , TAKANO YOICHI , CHIKASAWA KIYOHITO , TAKEDA SHIGEKI , YAMADA YUJI
IPC分类号： C02F3/06 , C02F3/30 , C02F3/34
摘要： PROBLEM TO BE SOLVED: To solve such a problem that denitrification reaction is not sufficiently generated when the inflow amount of sewage is varied in an organic wastewater treatment method wherein an oxygen free zone and an aerobic zone comprising a floating carrier are provided across an air diffusion pipe in an up and down direction within a reaction tank and raw water being wastewater and circulating water being treated water are mixed to be allowed to flow in the oxygen free zone and denitrification reaction is generated in the oxygen free zone by utilizing organic matter in the raw water and nitrification reaction is generated in the aerobic zone by utilizing oxygen from the air diffusion pipe to perform denitrification treatment in wastewater and, as a result, nitrogen is not sufficiently removed. SOLUTION: The amount of air injected from the air diffusion pipe is controlled corresponding to the amount of inflow raw water.

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