METHOD FOR CONTROLLING INTERMITTENT AERATION TYPE ACTIVATED SLUDGE METHOD
PROBLEM TO BE SOLVED: To prevent secondary discharge of phosphorus in a final sedimentation basin by arranging an ORP meter to the final sedimentation basin and providing a lower limit threshold value to the ORP value and increasing the flow rate of return sludge from the final sedimentation basin t...
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| creator | SASAKI YASUNARI MORI YUTAKA HATSUMATA SHIGERU |
| description | PROBLEM TO BE SOLVED: To prevent secondary discharge of phosphorus in a final sedimentation basin by arranging an ORP meter to the final sedimentation basin and providing a lower limit threshold value to the ORP value and increasing the flow rate of return sludge from the final sedimentation basin to an aeration tank when the ORP measured value becomes this lower limit value or less. SOLUTION: In an intermittent aeration type activated sludge method constituted of first and second aeration tanks 2a, 2b removing phosphorus in sewage 1 by activated sludge, a final sedimentation basin 4 separating activated sludge to obtain treated water 3 and a return pump 5 returning sedimented activated sludge to the first aeration tank 2a, an ORP meter is provided to the final sedimentation basin and a return sludge flowmeter 11 is provided on the way of a sludge return route. The preset lower limit of ORP is set to RL with respect to the measured value R of ORP sent from the ORP meter 10 to a control unit 9 and, when R |
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SOLUTION: In an intermittent aeration type activated sludge method constituted of first and second aeration tanks 2a, 2b removing phosphorus in sewage 1 by activated sludge, a final sedimentation basin 4 separating activated sludge to obtain treated water 3 and a return pump 5 returning sedimented activated sludge to the first aeration tank 2a, an ORP meter is provided to the final sedimentation basin and a return sludge flowmeter 11 is provided on the way of a sludge return route. The preset lower limit of ORP is set to RL with respect to the measured value R of ORP sent from the ORP meter 10 to a control unit 9 and, when R<=RL is formed, it is judged that there is the possibility of secondary discharge in the final sedimentation basin 4 and the return sludge pump 5 is controlled so that the flow rate thereof is increased.</description><edition>6</edition><language>eng</language><subject>CHEMISTRY ; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT ; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC ; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS ; METALLURGY ; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE ; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE</subject><creationdate>1998</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19980519&DB=EPODOC&CC=JP&NR=H10128378A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19980519&DB=EPODOC&CC=JP&NR=H10128378A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SASAKI YASUNARI</creatorcontrib><creatorcontrib>MORI YUTAKA</creatorcontrib><creatorcontrib>HATSUMATA SHIGERU</creatorcontrib><title>METHOD FOR CONTROLLING INTERMITTENT AERATION TYPE ACTIVATED SLUDGE METHOD</title><description>PROBLEM TO BE SOLVED: To prevent secondary discharge of phosphorus in a final sedimentation basin by arranging an ORP meter to the final sedimentation basin and providing a lower limit threshold value to the ORP value and increasing the flow rate of return sludge from the final sedimentation basin to an aeration tank when the ORP measured value becomes this lower limit value or less. SOLUTION: In an intermittent aeration type activated sludge method constituted of first and second aeration tanks 2a, 2b removing phosphorus in sewage 1 by activated sludge, a final sedimentation basin 4 separating activated sludge to obtain treated water 3 and a return pump 5 returning sedimented activated sludge to the first aeration tank 2a, an ORP meter is provided to the final sedimentation basin and a return sludge flowmeter 11 is provided on the way of a sludge return route. The preset lower limit of ORP is set to RL with respect to the measured value R of ORP sent from the ORP meter 10 to a control unit 9 and, when R<=RL is formed, it is judged that there is the possibility of secondary discharge in the final sedimentation basin 4 and the return sludge pump 5 is controlled so that the flow rate thereof is increased.</description><subject>CHEMISTRY</subject><subject>CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT</subject><subject>GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC</subject><subject>GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS</subject><subject>METALLURGY</subject><subject>TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS</subject><subject>TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE</subject><subject>TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1998</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZPD0dQ3x8HdRcPMPUnD29wsJ8vfx8fRzV_D0C3EN8vUMCXH1C1FwdA1yDPH091MIiQxwVXB0DvEMcwxxdVEI9gl1cXdVgBjBw8CalphTnMoLpbkZFN1cQ5w9dFML8uNTiwsSk1PzUkvivQI8DA0MjSyMzS0cjYlRAwBqPy23</recordid><startdate>19980519</startdate><enddate>19980519</enddate><creator>SASAKI YASUNARI</creator><creator>MORI YUTAKA</creator><creator>HATSUMATA SHIGERU</creator><scope>EVB</scope></search><sort><creationdate>19980519</creationdate><title>METHOD FOR CONTROLLING INTERMITTENT AERATION TYPE ACTIVATED SLUDGE METHOD</title><author>SASAKI YASUNARI ; MORI YUTAKA ; HATSUMATA SHIGERU</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPH10128378A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1998</creationdate><topic>CHEMISTRY</topic><topic>CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT</topic><topic>GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC</topic><topic>GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS</topic><topic>METALLURGY</topic><topic>TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS</topic><topic>TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE</topic><topic>TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE</topic><toplevel>online_resources</toplevel><creatorcontrib>SASAKI YASUNARI</creatorcontrib><creatorcontrib>MORI YUTAKA</creatorcontrib><creatorcontrib>HATSUMATA SHIGERU</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SASAKI YASUNARI</au><au>MORI YUTAKA</au><au>HATSUMATA SHIGERU</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>METHOD FOR CONTROLLING INTERMITTENT AERATION TYPE ACTIVATED SLUDGE METHOD</title><date>1998-05-19</date><risdate>1998</risdate><abstract>PROBLEM TO BE SOLVED: To prevent secondary discharge of phosphorus in a final sedimentation basin by arranging an ORP meter to the final sedimentation basin and providing a lower limit threshold value to the ORP value and increasing the flow rate of return sludge from the final sedimentation basin to an aeration tank when the ORP measured value becomes this lower limit value or less. SOLUTION: In an intermittent aeration type activated sludge method constituted of first and second aeration tanks 2a, 2b removing phosphorus in sewage 1 by activated sludge, a final sedimentation basin 4 separating activated sludge to obtain treated water 3 and a return pump 5 returning sedimented activated sludge to the first aeration tank 2a, an ORP meter is provided to the final sedimentation basin and a return sludge flowmeter 11 is provided on the way of a sludge return route. The preset lower limit of ORP is set to RL with respect to the measured value R of ORP sent from the ORP meter 10 to a control unit 9 and, when R<=RL is formed, it is judged that there is the possibility of secondary discharge in the final sedimentation basin 4 and the return sludge pump 5 is controlled so that the flow rate thereof is increased.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE |
| title | METHOD FOR CONTROLLING INTERMITTENT AERATION TYPE ACTIVATED SLUDGE METHOD |
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