WO2013084853A1 - 濾過装置の逆洗方法 - Google Patents
濾過装置の逆洗方法 Download PDFInfo
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- WO2013084853A1 WO2013084853A1 PCT/JP2012/081314 JP2012081314W WO2013084853A1 WO 2013084853 A1 WO2013084853 A1 WO 2013084853A1 JP 2012081314 W JP2012081314 W JP 2012081314W WO 2013084853 A1 WO2013084853 A1 WO 2013084853A1
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- WIPO (PCT)
- Prior art keywords
- water
- backwashing
- air
- filtration
- filter medium
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
Definitions
- the present invention relates to a backwashing method for a filtration device that performs filtration by passing water in a downward flow, and particularly relates to a backwashing method for a filtration device that performs air backwashing, water air backwashing, and water backwashing. .
- the backwashing step is (i) an air backwashing step in which the filter layer is loosened only with air, and (ii) the filter layer is developed using air and water in combination, and attached to the filter medium. It is described that it is performed in three steps: a water-air backwashing step for peeling off SS, and (iii) a water backwashing step in which SS attached to the filter medium is peeled off only with water and discharged outside the tower.
- Patent Document 3 describes that a wire mesh is installed so as to cross the upper part of the tower in order to prevent the filter medium from flowing out of the tower during backwashing.
- the baffle or the wire mesh when a baffle or a crossed wire mesh is provided in the upper part of the tower, the baffle or the wire mesh must be removed when repairing the inside of the tower or exchanging the filter medium, which takes time. If no baffle or wire mesh is provided, the backwash flow rate must be reduced so that the filter medium does not flow out during backwashing with water and air, and backwashing with water and air tends to be insufficient.
- An object of the present invention is to solve the above-described conventional problems, and to provide a backwashing method for a filtration device that has a simple structure of the filtration device and that can sufficiently perform backwashing with water and air.
- the backwashing method of the filtration device is a method of backwashing a filtration tower in which raw water is passed through the filter medium in the filtration tower in a downward flow, and includes air backwashing, water air backwashing and water backwashing.
- the drainage pipe having a strainer is provided at least 100 mm above the upper surface of the filter medium in the filtration tower, and the drainage pipe is provided with the drainage valve.
- the water-air backwashing is performed as opening.
- the water drain valve is opened, the water level in the filter tower is lowered to the level of the water drain pipe, and then the air backwashing is started.
- a drainage pipe with a strainer is provided at least 100 mm above the upper surface of the filter medium in the filtration tower, and a drainage valve is provided in the drainage pipe, The drain valve is opened and the backwash waste water is discharged from the drain pipe. Since the drainage pipe is provided with a strainer, even if the water-air backwash flow rate is increased and the water level in the tower becomes higher than the drainage pipe, the filter medium does not flow out to the drainage pipe. Therefore, the water / air backwash flow rate can be increased to sufficiently perform the water / air backwash.
- FIG. 1 is a raw water flow process
- FIG. 2 is a draining process
- FIG. 3 is a water-air backwash process
- 4 has shown the water backwashing process.
- a support plate 2 capable of passing water is installed in a transverse manner in the lower part of the filtration tower 1, and a sand filter medium layer 3 and an anthracite filter medium layer 4 are formed on the upper side thereof. Since anthracite has a specific gravity smaller than that of sand, an anthracite filter medium layer 4 is formed on the upper side of the sand filter medium layer 3.
- the filter medium is not limited to these, and only one type of filter medium may be filled.
- a raw water pipe 6 having a raw water inlet valve 5, an air pipe 8 having an air vent valve 7, and a backwash water outlet pipe 10 having a backwash water outlet valve 9 are provided at a fluid inlet / outlet portion at the top of the filtration tower 1. It is connected.
- a strainer 11 is installed at a height higher than the upper surface of the filter medium layer 4 by a height h, a drain pipe 12 is connected to the strainer 11, and a drain valve is connected to the drain pipe 12. 13 is provided.
- a mesh having an opening diameter smaller than the particle diameter of the filter medium of the filter medium layers 3 and 4 can be used.
- the above height h is 100 mm or more, preferably 100 to 500 mm, particularly preferably 200 to 300 mm.
- a treated water pipe 16 having a treated water outlet valve 15 At the fluid inlet / outlet portion at the bottom of the filtration tower 1, a treated water pipe 16 having a treated water outlet valve 15, a washing / drain outlet pipe 18 having a washing / drain outlet valve 17, and a reverse having a backwash water inlet valve 19.
- a flush inlet pipe 20 and an air inlet pipe 22 having an air inlet valve 21 are connected.
- the upward flow velocity is set to be equal to or lower than the sedimentation rate of sand and equal to or greater than the sedimentation rate of anthracite, and sand having a large specific gravity is first sedimented to form the filter medium layer 3. Thereafter, the upward flow velocity is set to be equal to or lower than the sedimentation rate of the anthracite, or the upward flow is stopped and the anthracite is sedimented to form the filter medium layer 4.
- the filter media layers 3 and 4 are backwashed by air backwashing, water air backwashing, and water backwashing, and backwashing from the drain pipe 12 with a strainer during this water air backwashing. Drainage is discharged, and the filter medium does not flow out of the tower even if the flow rate of air and water for backwashing with water is increased. Therefore, water / air backwashing can be performed strongly and backwashing can be performed sufficiently. Further, there is no baffle or crossed wire mesh in the upper part of the filter tower 1, so that maintenance in the filter tower and replacement of the filter medium can be easily performed.
- FIG. 5 shows the change over time in the water flow differential pressure.
- FIG. 5 shows the change over time in the pressure loss.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
図1の通り、原水通水時には原水入口弁5と処理水出口弁15を開、その他の弁を閉とし、原水を下向流にて濾材層4,3に通水し、処理水(濾過水)を処理水管16から取り出す。
逆洗を行うには、まず図2のように、空気抜き弁7と水抜き弁13とを開、その他の弁を閉とし、濾過塔1内の水位を水抜き管12のレベルまで低下させる。
次いで、図示は省略するが、空気入口弁21及び空気抜き弁7を開、その他の弁を閉とし、空気入口管22から濾過塔1内に空気を供給し、空気逆洗を行い、濾材層3,4をほぐす。なお、このとき、水抜き弁13も開としてもよい。
次に、図3のように、空気抜き弁7、水抜き弁13、逆洗水入口弁19及び空気入口弁21を開とし、その他の弁を閉とし、濾過塔1内に逆洗水と空気とを供給し、濾材層3,4を展開させ、濾材に付着していた付着物を剥離させる。この水空気逆洗排水は水抜き管12から流出する。空気は主として空気管8から流出する。水抜き弁13を開としているので、濾過塔1内の水面位は水抜き管12と同レベルかそれよりも若干上位となる程度であり、塔頂部にまでは達することはなく、濾材は空気管8からは流出しない。また、水抜き管12にはストレーナ11を設けてあるので、濾材が水抜き管12から流出することもない。
その後、図4の通り、逆洗水入口弁19及び逆洗水出口弁9を開、その他の弁を閉とし、濾過塔1内に逆洗水を上向流にて通水する。このときの上向流速は、濾材層4のアンスラサイト濾材が流出しない速度とする。この逆洗により、濾材に付着していた付着物が剥離されると共に、剥離した付着物が逆洗水出口管10から排出される。その後、上向流速を砂の沈降速度以下、アンスラサイト沈降速度以上とし、比重の大きい砂を先に沈降させて濾材層3を形成する。その後、上向流速をアンスラサイトの沈降速度以下とするか、又は上向流を停止し、アンスラサイトを沈降させて濾材層4を形成する。
その後、原水入口弁5及び洗浄排水出口弁17を開、その他の弁を閉とし、原水を下向流にて通水し、濾材層3,4を洗浄し、洗浄排水を洗浄排水出口管18から排出する。
図1の通り、塔径1000mm、塔高2000mmの塔内に静止層高400mmの砂濾材層3及び静止層高400mmのアンスラサイト濾材層4を充填した。h=200mmである。この濾過塔1に対し原水(酸排水、SS濃度10mg/L)をLV=8m/hで下向流にて24Hr通水した。これにより、圧損が増大してきたので、水抜き工程により水位を水抜き管12のレベルまで低下させた後、
空気逆洗(LV=1Nm3/min・m2、5min)
空気水逆洗(空気LV=0.5Nm3/min・m2、水LV=15m/h、1min)
水逆洗(LV=30m/h、10min)
よりなる逆洗工程を行い、次いで原水をLV=8m/hで10min通水する濾材洗浄工程を行った。24時間の原水通水毎にこの逆洗工程及び濾材洗浄工程を行った。通水差圧の経時変化を図5に示す。
実施例1おいて、上記水抜き工程後の逆洗工程を、
空気逆洗(LV=1Nm3/min・m2、5min)
水逆洗(LV=30m/h、10min)
のみとし、水空気逆洗を省略した。その他は同様とした。圧損の経時変化を図5に示す。
なお、本出願は、2011年12月5日付で出願された日本特許出願(特願2011-265816)に基づいており、その全体が引用により援用される。
Claims (2)
- 濾過塔内の濾材に原水を下向流にて通水する濾過塔を逆洗する方法であって、
空気逆洗、水空気逆洗及び水逆洗を行う濾過装置の逆洗方法において、
該濾過塔内の濾材上面よりも100mm以上上位に、ストレーナを有した水抜き管を設けると共に該水抜き管に水抜き弁を設け、
該水抜き弁を開として前記水空気逆洗を行うことを特徴とする濾過装置の逆洗方法。 - 請求項1において、前記原水の通水工程後、前記水抜き弁を開とし、濾過塔内の水位を前記水抜き管のレベルまで低下させた後、前記空気逆洗を開始することを特徴とする濾過装置の逆洗方法。
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KR1020147013046A KR20140109364A (ko) | 2011-12-05 | 2012-12-04 | 여과 장치의 역세 방법 |
JP2013548230A JP5850063B2 (ja) | 2011-12-05 | 2012-12-04 | 濾過装置の逆洗方法 |
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JP2011-265816 | 2011-12-05 | ||
JP2011265816 | 2011-12-05 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014079665A (ja) * | 2012-10-12 | 2014-05-08 | Swing Corp | 水処理装置の洗浄方法 |
CN105169781A (zh) * | 2015-08-06 | 2015-12-23 | 联合通用电梯股份有限公司 | 一种应用于电梯或扶梯的循环式高效废水过滤装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0824524A (ja) * | 1994-07-12 | 1996-01-30 | Kurita Water Ind Ltd | 濾過装置 |
JPH08131722A (ja) * | 1994-11-11 | 1996-05-28 | Kurita Water Ind Ltd | 下向流濾過装置 |
JPH09817A (ja) * | 1995-06-16 | 1997-01-07 | Kurita Water Ind Ltd | 下向流濾過装置 |
JP2009125657A (ja) * | 2007-11-22 | 2009-06-11 | Kurita Water Ind Ltd | 濾過装置 |
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- 2012-12-04 WO PCT/JP2012/081314 patent/WO2013084853A1/ja active Application Filing
- 2012-12-04 JP JP2013548230A patent/JP5850063B2/ja active Active
- 2012-12-04 KR KR1020147013046A patent/KR20140109364A/ko active Search and Examination
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0824524A (ja) * | 1994-07-12 | 1996-01-30 | Kurita Water Ind Ltd | 濾過装置 |
JPH08131722A (ja) * | 1994-11-11 | 1996-05-28 | Kurita Water Ind Ltd | 下向流濾過装置 |
JPH09817A (ja) * | 1995-06-16 | 1997-01-07 | Kurita Water Ind Ltd | 下向流濾過装置 |
JP2009125657A (ja) * | 2007-11-22 | 2009-06-11 | Kurita Water Ind Ltd | 濾過装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014079665A (ja) * | 2012-10-12 | 2014-05-08 | Swing Corp | 水処理装置の洗浄方法 |
CN105169781A (zh) * | 2015-08-06 | 2015-12-23 | 联合通用电梯股份有限公司 | 一种应用于电梯或扶梯的循环式高效废水过滤装置 |
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KR20140109364A (ko) | 2014-09-15 |
JPWO2013084853A1 (ja) | 2015-04-27 |
JP5850063B2 (ja) | 2016-02-03 |
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