JP2581600B2 - Method for overconcentration of sludge - Google Patents
Method for overconcentration of sludgeInfo
- Publication number
- JP2581600B2 JP2581600B2 JP1271546A JP27154689A JP2581600B2 JP 2581600 B2 JP2581600 B2 JP 2581600B2 JP 1271546 A JP1271546 A JP 1271546A JP 27154689 A JP27154689 A JP 27154689A JP 2581600 B2 JP2581600 B2 JP 2581600B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- concentrated
- section
- concentration
- liquid collecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010802 sludge Substances 0.000 title claims description 193
- 238000000034 method Methods 0.000 title claims description 28
- 239000007788 liquid Substances 0.000 claims description 55
- 238000007599 discharging Methods 0.000 claims description 15
- 230000008719 thickening Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 description 13
- 238000004062 sedimentation Methods 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000008235 industrial water Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004094 preconcentration Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、上水処理，産業用水処理，下水処理，し尿
処理，産業排水処理などで発生する汚泥を過濃縮する
ための方法に関するもので、特に汚泥を天日乾燥床や、
加圧脱水機，遠心脱水機，凍結融解機等で脱水する場合
の前処理として使用する過濃縮方法に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a method for overconcentrating sludge generated in water treatment, industrial water treatment, sewage treatment, human waste treatment, industrial wastewater treatment, and the like. , Especially sludge and sun drying floor,
The present invention relates to an overconcentration method used as a pretreatment when dehydrating with a pressure dehydrator, a centrifugal dehydrator, a freeze-thaw machine, or the like.
従来、上水処理，産業用水処理，下水処理，し尿処
理，産業排水処理などで発生する汚泥を脱水する場合、
汚泥に鉄塩党の無機凝集剤，石灰、または高分子凝集剤
等の脱水助剤を添加し、水中造粒脱水機，真空過機，
加圧過機，遠心脱水機，ベルトプレス型脱水機等の脱
水機で脱水処理していた。近年、特に上水処理，産業用
水処理等の分野で、薬注なしの天日乾燥床や加圧脱水機
で脱水処理するケースが増えてきている。このような脱
水処理をする場合、天日乾燥床や、加圧脱水機へ供給す
る際の汚泥の濃度が非常に重要であり、汚泥濃度が薄い
と天日乾燥床や、加圧脱水機での処理効率が著しく低下
する。従来、汚泥の前濃縮にはシックナーなどの沈降法
（沈殿法）が用いられてきたが、最近では汚泥中に有機
物や水酸化アルミニウム等の濃縮しにくい成分の割合が
増加し、沈降法では十分に濃縮できないことが多くなっ
てきた。Conventionally, when dewatering sludge generated in water treatment, industrial water treatment, sewage treatment, human waste treatment, industrial wastewater treatment, etc.
Add a dewatering aid such as iron salt party coagulant, lime, or polymer coagulant to sludge, and use underwater granulation dewatering machine, vacuum filter,
The dehydration was performed by a dehydrator such as a pressurized filter, a centrifugal dehydrator, and a belt press dehydrator. In recent years, in particular in the fields of water treatment, industrial water treatment, and the like, the number of cases of dehydration using a sun-dry bed or a pressure dehydrator without chemical injection has been increasing. When performing such a dehydration treatment, the concentration of sludge when supplying to a solar drying bed or a pressure dehydrator is very important. The efficiency drops significantly. Conventionally, the sedimentation method (sedimentation method) such as thickener has been used for pre-concentration of sludge. However, recently, the ratio of components that are difficult to concentrate, such as organic substances and aluminum hydroxide, has increased in the sludge. Have not been able to be concentrated.
そのため、例えば第５図に示すような過濃縮装置が
用いられていた。即ち、密閉槽１内に水平の仕切板２に
よって汚泥濃縮部３とその上部に液を集める集液部４
が区画形成され、汚泥濃縮部３には汚泥流入弁５を備え
た汚泥流入管６が連設され、集液部４には液弁７を備
えた液流出管８と空気抜弁９を備えた空気抜管10が連
設されている。さらに、汚泥濃縮部３内には、支持体の
外周に布を巻き付け、一端を開放し他端を閉鎖したフ
ィルターエレメント（以下単にエレメントという）11が
配設され、各開放端部付近が仕切板２に固定され、エレ
メント11内に透過した液がその開放端を経て集液部４
内に流れるようになっている。また、密閉槽１内下方部
は濃縮汚泥排出部12が形成され、濃縮汚泥排出弁13を備
えた濃縮汚泥排出管14が連設されている。For this reason, for example, an overconcentrator as shown in FIG. 5 has been used. That is, a sludge concentrating unit 3 and a liquid collecting unit 4 for collecting liquid on the sludge concentrating unit 3 by a horizontal partition plate 2
A sludge inflow pipe 6 having a sludge inflow valve 5 is connected to the sludge concentration section 3, and a liquid outflow pipe 8 having a liquid valve 7 and an air vent valve 9 are provided in the liquid collection section 4. An air vent tube 10 is provided continuously. Further, in the sludge thickening section 3, a filter element (hereinafter simply referred to as an element) 11 having a cloth wrapped around the support and having one end opened and the other end closed is provided. 2 and the liquid permeated into the element 11 passes through the open end of the liquid collecting section 4
It flows inside. A concentrated sludge discharge part 12 is formed in the lower part in the closed tank 1, and a concentrated sludge discharge pipe 14 provided with a concentrated sludge discharge valve 13 is continuously provided.
このような過濃縮装置は、第６図に示すように、汚
泥流入管６を、吸入側が原汚泥貯槽15に連なる汚泥ポン
プ16の吐出側に連結し、原汚泥貯槽15に貯留された原汚
泥を、汚泥ポンプ16にて汚泥流入管６を経て密閉槽１内
の汚泥濃縮部３に供給するが、原汚泥を汚泥ポンプ16に
よって圧入するか、あるいは集液部４側を減圧すること
によって、エレメント11内外に生じた差圧によりエレメ
ント11の外側に汚泥が付着し濃縮される一方、液はエ
レメント11の内部に透過して集液部４に集められ、液
流出管８から流出する。As shown in FIG. 6, such an over-concentrator has a sludge inflow pipe 6 connected to a discharge side of a sludge pump 16 having a suction side connected to a raw sludge storage tank 15, and the raw sludge stored in the raw sludge storage tank 15. Is supplied to the sludge concentrating unit 3 in the closed tank 1 through the sludge inflow pipe 6 by the sludge pump 16, and the raw sludge is injected by the sludge pump 16 or the pressure in the liquid collecting unit 4 is reduced. The sludge adheres to the outside of the element 11 and is concentrated by the differential pressure generated inside and outside the element 11, while the liquid permeates into the inside of the element 11, is collected in the liquid collecting part 4, and flows out from the liquid outflow pipe 8.
上記操作により、エレメント11の外側に付着し所定濃
度に汚泥が濃縮された時には、原汚泥の供給を停止し、
戻し弁17を開いて戻し管18から汚泥濃縮部３内の未濃縮
汚泥を原汚泥貯槽15に戻したのち戻し弁17を閉じ、汚泥
濃縮部３内を大気に開放したのち、エレメント11内に圧
力空気などをブローして外側に付着している濃縮汚泥を
剥離し、濃縮汚泥は濃縮汚泥排出部12に落下し、濃縮汚
泥排出弁13を開いて濃縮汚泥排出管14から排出される。
このような濃縮汚泥の剥離，排出工程終了後は、濃縮汚
泥排出弁13を閉じ、汚泥濃縮部３内の大気開放を遮断
し、再び汚泥ポンプ16にて原汚泥貯槽15内の汚泥を汚泥
濃縮部３に充満したのち、前述のような過濃縮が行わ
れる。By the above operation, when the sludge is attached to the outside of the element 11 and concentrated to a predetermined concentration, the supply of the raw sludge is stopped,
After returning the unconcentrated sludge in the sludge thickening section 3 from the return pipe 17 to the raw sludge storage tank 15 through the return pipe 18, the return valve 17 is closed, and the inside of the sludge thickening section 3 is opened to the atmosphere. The concentrated sludge adhering to the outside is peeled off by blowing compressed air or the like, and the concentrated sludge falls to the concentrated sludge discharge section 12, opens the concentrated sludge discharge valve 13, and is discharged from the concentrated sludge discharge pipe 14.
After such a process of stripping and discharging the concentrated sludge, the concentrated sludge discharge valve 13 is closed, the air in the sludge concentration section 3 is shut off, and the sludge in the raw sludge storage tank 15 is again concentrated by the sludge pump 16. After filling the part 3, the overconcentration as described above is performed.
このような汚泥充満工程，過濃縮工程，未濃縮汚泥
排出工程，濃縮汚泥剥離，排出工程を１サイクルとした
従来の汚泥の過濃縮方法には、次のような多くの問題
点を有していた。The conventional sludge over-concentration method having such a sludge filling step, over-concentration step, unconcentrated sludge discharge step, concentrated sludge separation and discharge step as one cycle has many problems as follows. Was.
未濃縮汚泥排出工程における密閉槽１から原汚泥貯
槽15への未濃縮汚泥の返送は、動力費等の低減のために
も自然流下方式が好ましく、そのために原汚泥貯槽15の
高水位（HWL）は密閉槽１より低いことが必要で、平地
においては原汚泥貯槽15を埋没、あるいは密閉槽１を高
架にせねばならず、建設費が多くなる。The return of the non-concentrated sludge from the closed tank 1 to the raw sludge storage tank 15 in the non-concentrated sludge discharge process is preferably performed by a natural flow method in order to reduce the power cost and the like. Therefore, the high water level (HWL) of the raw sludge storage tank 15 is preferable. Needs to be lower than the closed tank 1, and in a flat ground, the raw sludge storage tank 15 must be buried or the closed tank 1 must be elevated, which increases construction costs.
未濃縮汚泥が原汚泥貯槽15に返送されると、原汚泥
貯槽15の容積は最大返送量分を見込まなければならず、
非常に大きくなる。When the unconcentrated sludge is returned to the raw sludge storage tank 15, the volume of the raw sludge storage tank 15 must allow for the maximum return amount,
Very large.
過濃縮工程が終了した時点での密閉槽１内の未濃
縮汚泥量は、密閉槽１内の集液部４とエレメント11内
液部を除いた60〜80％程度と、非常に大きな量である。
このため、未濃縮汚泥排出工程及び次回の過濃縮工程
前の汚泥充満工程に要する時間、いわゆる雑時間が増
え、１サイクル当たりの所要時間も多くなる。さらに、
汚泥充満工程における汚泥ポンプ16の稼働により、動力
費も多くなる。The amount of unconcentrated sludge in the closed tank 1 at the time when the overconcentration step is completed is a very large amount of about 60 to 80% excluding the liquid collecting part 4 and the liquid part in the element 11 in the closed tank 1. is there.
Therefore, the time required for the unconcentrated sludge discharge step and the sludge filling step before the next overconcentration step, that is, so-called miscellaneous time, increases, and the time required for one cycle also increases. further,
Operating the sludge pump 16 in the sludge filling process also increases power costs.
未濃縮汚泥排出工程により、密閉槽１内のエレメン
ト11が空気と接触することになる。さらに、空気ブロー
等にて濃縮汚泥の剥離を行うと、エレメント11内に残留
又は付着している液等が酸化状態になる。そのため、
原汚泥貯槽15において、あるいはそれ以前に行われた濃
縮操作等において、還元状態でイオン化されていた鉄，
マンガン等が酸化されてエレメント11に付着し、その通
気度の低下，過速度の低下ともなり、寿命も著しく短
くなる。By the unconcentrated sludge discharging step, the element 11 in the closed tank 1 comes into contact with air. Further, when the concentrated sludge is stripped by air blow or the like, the liquid or the like remaining or adhered in the element 11 is oxidized. for that reason,
In the raw sludge storage tank 15 or in a concentration operation or the like performed before that, iron which has been ionized in a reduced state,
Manganese or the like is oxidized and adheres to the element 11, resulting in a decrease in air permeability and a decrease in overspeed, and the life is significantly shortened.
本発明は、このような従来の問題点を解決し、従来の
汚泥充満工程，未濃縮汚泥排出工程を行うことなく、
過濃縮装置内の汚泥濃縮部を汚泥で満杯にした状態のま
まで濃縮汚泥の剥離，排出を行い、雑時間，ランニング
コストの低減，設備の簡素化，エレメントの目詰まり防
止等を図ることができる汚泥の過濃縮方法を提供する
ことを目的としている。The present invention solves such conventional problems, without performing the conventional sludge filling step and unconcentrated sludge discharge step,
It is possible to remove and discharge concentrated sludge while the sludge thickening section in the over-concentrator is full of sludge, to reduce miscellaneous time, running cost, simplify equipment, and prevent element clogging. It is an object of the present invention to provide a method for overconcentrating sludge that can be performed.
本発明は、密閉槽１内に汚泥濃縮部３と集液部４とを
区画形成し、汚泥濃縮部３内に一端を開放して他端を閉
鎖した筒状フィルターエレメント11を配設し、その開放
端部を集液部４に連通した汚泥の濾過濃縮装置を使用
し、汚泥濃縮部３内に汚泥を供給し、筒状フィルターエ
レメント11内に透過した瀘液を集液部４を経て槽外に流
出させて汚泥の濾過濃縮を行う方法において、筒状フィ
ルターエレメント11外側に付着した濃縮汚泥を剥離、排
出するに当たり、汚泥の供給を停止し汚泥濃縮部３内の
未濃縮汚泥を排出することなく汚泥濃縮部３内上部を大
気に開放して該大気開放に伴う圧力差により前記筒状フ
ィルターエレメント11に付着した濃縮汚泥を剥離する工
程と、剥離された濃縮汚泥を汚泥濃縮部３において沈澱
させる工程と、汚泥濃縮部３の底部近傍に沈澱した濃縮
汚泥を槽外に排出する工程とを有することを特徴とする
汚泥の濾過濃縮方法であり、また、前記筒状フィルター
エレメント11外側に付着した濃縮汚泥を剥離するに当た
り、集液部４を真空源に接続して濾液面を一旦上昇させ
た後に前記大気開放を行なうことを特徴とするものであ
り、さらに、前記筒状フィルターエレメント11外側に付
着した濃縮汚泥を剥離するに当たり、前記大気開放後に
集液部４に圧力ガス又は圧力水を導入することを特徴と
するものである。According to the present invention, a sludge concentrating unit 3 and a liquid collecting unit 4 are partitioned and formed in a closed tank 1, and a cylindrical filter element 11 having one end opened and the other end closed in the sludge concentrating unit 3 is provided. The sludge is fed into the sludge concentrating unit 3 by using a sludge filtration / concentration device whose open end communicates with the liquid collecting unit 4, and the filtrate that has passed through the cylindrical filter element 11 is passed through the liquid collecting unit 4. In the method in which the sludge is discharged out of the tank to filter and concentrate the sludge, when the concentrated sludge attached to the outside of the tubular filter element 11 is peeled and discharged, the supply of the sludge is stopped and the unconcentrated sludge in the sludge concentration section 3 is discharged. A step of opening the upper portion of the sludge concentration section 3 to the atmosphere without removing the concentrated sludge adhered to the tubular filter element 11 by a pressure difference caused by the opening to the atmosphere; Precipitation and sludge concentration Discharging the concentrated sludge settled in the vicinity of the bottom of the sludge to the outside of the tank. 3. A method for filtering and condensing sludge, wherein the concentrated sludge adhering to the outside of the cylindrical filter element 11 is removed. And connecting the liquid collecting section 4 to a vacuum source to once raise the filtrate surface and then releasing the air to the atmosphere. Further, the concentrated sludge adhering to the outside of the cylindrical filter element 11 is peeled off. In doing so, a pressurized gas or pressurized water is introduced into the liquid collecting section 4 after the release to the atmosphere.
以下に、実施態様の一例を示す第１図及び第２図に基
づいて本発明の作用を説明する。Hereinafter, the operation of the present invention will be described based on FIGS. 1 and 2 showing an example of the embodiment.
第１図は本発明で使用する過濃縮装置の一例で、前
述した従来例を示す第５図と同一符号は同一部分を示
し、19は汚泥濃縮部３内上部に連通する空気抜管20に設
けられた空気抜弁で、また、集液部４には、空気流入弁
21を備え空気源に連なる空気管22と、真空弁23を備え真
空源に連なる真空管24とが連通されている。FIG. 1 shows an example of an over-concentrator used in the present invention. The same reference numerals as those in FIG. 5 showing the above-mentioned conventional example denote the same parts, and 19 denotes an air vent pipe 20 communicating with the upper part of the sludge concentrating section 3. The air vent valve is provided and the liquid collecting part 4 has an air inflow valve.
An air pipe 22 provided with an air source 21 and connected to an air source, and a vacuum pipe 24 provided with a vacuum valve 23 and connected to the vacuum source are connected.
なお、エレメント11としては、公知の多孔管等の支持
体の外周に布を巻き付けたもの、中空糸，多孔質セラ
ミックス過筒，多孔質の樹脂系過筒等を使用するこ
とができるが、コイルスプリング等の弾性支持体で筒状
布を支持した伸縮自在の構造のエレメント11を使用す
るのが好ましい。The element 11 may be a known support such as a perforated tube with a cloth wrapped around it, a hollow fiber, a porous ceramic tube, a porous resin tube, or the like. It is preferable to use an element 11 having an elastic structure in which the tubular cloth is supported by an elastic support such as a spring.
しかして、まず過濃縮工程では、空気抜弁19,空気
流入弁21,真空弁23,濃縮汚泥排出弁13を閉として、汚泥
流入弁5,液弁7,空気抜弁９を開とし、汚泥ポンプ16を
稼動して汚泥濃縮部３内に打込むと、汚泥濃縮部３内に
貯留されている汚泥に圧力がかかり、エレメト11によっ
て過されてエレメント11の外側には汚泥が付着して濃
縮され、液はエレメント11内を経て集液部４に貯留さ
れ、液弁７から流出する。この時、集液部４内の液
はHWLに保たれ、伸縮自在のエレメント11は過濃縮中
には縮んだ状態となっている。In the overconcentration step, first, the air release valve 19, the air inflow valve 21, the vacuum valve 23, and the concentrated sludge discharge valve 13 are closed, the sludge inflow valve 5, the liquid valve 7, and the air release valve 9 are opened, and the sludge pump 16 is opened. Is operated and driven into the sludge thickening section 3, pressure is applied to the sludge stored in the sludge thickening section 3, the sludge is passed by the element 11, and the sludge adheres to the outside of the element 11 and is concentrated, The liquid is stored in the liquid collecting part 4 via the inside of the element 11 and flows out from the liquid valve 7. At this time, the liquid in the liquid collecting part 4 is kept at HWL, and the expandable and contractible element 11 is in a contracted state during the overconcentration.
このような過濃縮工程終了後はエレメント11の外側
に付着している濃縮汚泥の剥離，排出工程に移るが、本
発明では濃縮汚泥剥離，排出工程の前に従来行われてい
た未濃縮汚泥排出工程は行わない。即ち、請求項１の発
明においては、過濃縮工程終了後、汚泥濃縮部３内の
汚泥を排出することなく、そのままとし、汚泥ポンプ16
を停止し、汚泥流入弁5,液弁7,空気抜弁９を閉にし、
真空弁23,空気抜弁19を開にし、集液部４を真空状態と
し、液のレベルをHWLに保つ。After the completion of the over-concentration process, the process proceeds to a process of removing and discharging the concentrated sludge adhering to the outside of the element 11. In the present invention, the non-condensed sludge discharging process conventionally performed before the process of removing and discharging the concentrated sludge No process is performed. That is, in the first aspect of the present invention, after the completion of the overconcentration step, the sludge in the sludge concentration section 3 is not discharged, but is left as it is, and the sludge pump 16
Is stopped, and the sludge inflow valve 5, liquid valve 7, and air vent valve 9 are closed,
The vacuum valve 23 and the air vent valve 19 are opened, the liquid collecting section 4 is evacuated, and the liquid level is maintained at HWL.
次に、真空弁23を閉、空気抜弁９を開にすると、集液
室４内の真空状態が破壊され、液がエレメント11内へ
逆流し、エレメント11の外側に付着している濃縮汚泥が
剥離されると同時にエレメント11は洗浄される。この
時、エレメント11が伸縮自在であれば、エレメント11は
伸びるから、濃縮汚泥の剥離はより効果的となる。Next, when the vacuum valve 23 is closed and the air vent valve 9 is opened, the vacuum state in the liquid collecting chamber 4 is broken, the liquid flows back into the element 11, and the concentrated sludge adhering to the outside of the element 11 is removed. The element 11 is washed at the same time as being peeled off. At this time, if the element 11 can be expanded and contracted, the element 11 expands, and the stripping of the concentrated sludge becomes more effective.
なお、濃縮汚泥をエレメント11から剥離する際に、前
述のように集液室４を真空状態にしてから剥離を行うと
均等に剥離できるので好ましいが、真空状態にせずにい
きなり空気抜弁19を開放するだけでも剥離できる。この
際には、真空弁23,空気抜弁９の操作は必要ではなく閉
にしておく。また、前述の集液室４の真空破壊後に空気
抜弁９を閉にし、空気流入弁21を開にして集液部４内に
圧力空気又は他から圧力水を導いて逆流する液を加圧
すれば、濃縮汚泥の剥離が一層効果的に行われる。ま
た、真空弁23が閉，空気抜弁９が閉の状態で、空気管22
の空気流入弁21を開にすると、減圧状態から一気に加圧
状態になり、液がエレメント101内に急激に逆流する
ため、最も効率の良い濃縮汚泥の剥離とエレメント11の
洗浄が行われる。When the concentrated sludge is peeled off from the element 11, it is preferable that the liquid collecting chamber 4 is vacuumed and then peeled off as described above, so that the sludge can be evenly peeled off. You can peel off just by doing. In this case, the operation of the vacuum valve 23 and the operation of the air vent valve 9 are not necessary and are kept closed. Further, after the above-mentioned vacuum breaking of the liquid collecting chamber 4, the air vent valve 9 is closed, and the air inflow valve 21 is opened to guide the pressurized air or the pressure water from the other into the liquid collecting section 4 to pressurize the liquid flowing backward. If this is the case, the separation of the concentrated sludge will be performed more effectively. When the vacuum valve 23 is closed and the air vent valve 9 is closed, the air pipe 22 is closed.
When the air inflow valve 21 is opened, the pressure is changed from the depressurized state to the pressurized state at once, and the liquid rapidly flows back into the element 101. Therefore, the most efficient stripping of the concentrated sludge and the cleaning of the element 11 are performed.
剥離された濃縮汚泥は濃縮汚泥排出部12に沈降する
が、一旦濃縮された汚泥はその形状が壊れることなく未
濃縮汚泥中に沈降し、またエレメント11内に逆流し、流
出する液は微々たる量であるから、未濃縮汚泥をわず
かに希釈する程度であり、濃縮汚泥はほとんど希釈され
ることなく濃縮汚泥排出部12の底部に堆積し、堆積した
濃縮汚泥は、濃縮汚泥排出弁13を開にし、場合によって
はポンプを使用することによって濃縮汚泥排出管14から
排出される。なお、濃縮汚泥排出用のポンプとしてはス
ネークポンプあるいはその他の容積形ポンプを使用する
と良い。The separated concentrated sludge settles in the concentrated sludge discharge section 12, but the once concentrated sludge settles in the non-concentrated sludge without breaking its shape, flows back into the element 11, and the outflowing liquid is insignificant. Because of the volume, it only slightly dilutes the unconcentrated sludge, and the concentrated sludge is deposited on the bottom of the concentrated sludge discharge section 12 without being diluted, and the accumulated concentrated sludge opens the concentrated sludge discharge valve 13. In some cases, the concentrated sludge is discharged from the concentrated sludge discharge pipe 14 by using a pump. As a pump for discharging the concentrated sludge, a snake pump or another positive displacement pump may be used.
この濃縮汚泥剥離，排出工程は濃縮汚泥排出管14から
排出される汚泥の濃度を測定して、所定濃度以下になっ
た時あるいは所定時間経過後に終了し、再び過濃縮工
程に切換えるが、排出汚泥濃度を自動的に測定し自動停
止及び切換を可能にすれば便利である。This concentrated sludge stripping and discharging step measures the concentration of the sludge discharged from the concentrated sludge discharge pipe 14 and ends when the concentration falls below a predetermined concentration or after a predetermined time has elapsed, and switches to the overconcentration step again. It would be convenient if the concentration could be measured automatically and automatic stop and switching enabled.
かくて、再び過濃縮工程が行われるが、汚泥濃縮部
３内は、濃縮汚泥の剥離に使われた僅かな液と未濃縮
汚泥とでほとんど満杯状態となっており、従来のような
汚泥充満工程はほとんど必要ない。Thus, the over-concentration process is performed again. However, the inside of the sludge concentration section 3 is almost full of the small amount of liquid used for stripping the concentrated sludge and the non-concentrated sludge, and the sludge is filled as in the conventional case. Very few steps are required.
また、請求項２の発明においては、エレメント11の濃
縮汚泥の剥離，洗浄時は前記請求項１の発明と同様であ
るが、剥離されて濃縮汚泥排出部12の底部に沈降，堆積
した濃縮汚泥の排出方法が異なる。即ち、エレメント11
の濃縮汚泥の剥離，洗浄を行ったのち、剥離された濃縮
汚泥を排出することなく、そのまま各弁を開閉を行い、
汚泥ポンプ16を稼動して過濃縮工程を再開する。この
時、汚泥濃縮部３内に圧力がかかり、過濃縮が行われ
ると同時に、濃縮汚泥排出弁13を開にすることによっ
て、汚泥濃縮部３内の圧力あるいは必要によりポンプを
使用して、沈降，堆積している濃縮汚泥が所定時間連続
的に排出される。従って、１サイクル当たりの所要時間
がさらに短縮される。Further, in the invention of claim 2, when the concentrated sludge of the element 11 is peeled off and washed, it is the same as that of the invention of claim 1, but the concentrated sludge which has been peeled off and settles and deposits on the bottom of the concentrated sludge discharge section 12 Discharge method is different. That is, element 11
After separating and washing the concentrated sludge, the valves are opened and closed as they are without discharging the separated concentrated sludge.
The sludge pump 16 is operated to restart the overconcentration process. At this time, pressure is applied to the sludge thickening section 3 and over-concentration is performed. Simultaneously, the concentrated sludge discharge valve 13 is opened to settle the sedimentation by using the pressure in the sludge thickening section 3 or using a pump if necessary. The accumulated sludge is continuously discharged for a predetermined time. Therefore, the required time per cycle is further reduced.
この場合の濃縮汚泥の排出も、排出汚泥濃度が所定濃
度以下になった時に自動停止できるようにすることが好
ましい。In this case, it is preferable that the discharge of the concentrated sludge can be automatically stopped when the discharged sludge concentration becomes equal to or lower than the predetermined concentration.
なお、前述したようなエレメント11への酸化物付着に
よる機能低下を防ぐためには、濃縮汚泥剥離排出工程に
おいてエレメント11を空気と接触させないようにするこ
とが必要であり、そのためには、該工程中液が常に集
液部４内に残っているように集液部４の容積を設定する
ことが好ましい。多くの実験結果によれば、濃縮汚泥の
剥離に必要な液量は２〜15/m2−エレメント程度で
あり、また空気圧併用の場合の空気圧は0.5〜2kgf/cm2
程度が最適であった。In order to prevent the functional deterioration due to the adhesion of the oxide to the element 11 as described above, it is necessary to prevent the element 11 from coming into contact with air in the concentrated sludge peeling and discharging step. It is preferable to set the volume of the liquid collecting part 4 so that the liquid always remains in the liquid collecting part 4. According to many experimental results, the amount of liquid required for stripping the concentrated sludge is about 2 to 15 / m 2 -element, and the air pressure when combined with air pressure is 0.5 to 2 kgf / cm 2
The degree was optimal.
さらに、エレメント11を空気と接触させないための手
段としては、第３図に示すように、集液部４に水位計25
を設け、液水位が集液部４内LWLで空気流入弁21を閉
にし、大気開放とすることができるようにすると良い。
また、第４図に示すように、集液部４上部に弾性あるダ
イヤフラム26を張設して空気室27を形成し、この空気室
27に空気源から所定圧力の空気を導くようにすることも
でき、その時の空気抜管10は液流出管８から分岐させ
る。Further, as means for preventing the element 11 from coming into contact with the air, as shown in FIG.
It is preferable that the liquid level is LWL in the liquid collecting section 4 to close the air inflow valve 21 and open the atmosphere.
Further, as shown in FIG. 4, an elastic diaphragm 26 is stretched over the liquid collecting part 4 to form an air chamber 27, and this air chamber 27 is formed.
Air of a predetermined pressure can be introduced from an air source to the air source 27. At that time, the air vent tube 10 is branched from the liquid outlet tube 8.
上述したように、本発明では、濃縮汚泥の剥離，排出
に当たって装置内の未濃縮汚泥を原汚泥貯槽15に返送す
ることなく、そのまま濃縮汚泥を剥離するものであるか
ら、原汚泥貯槽15の容量は従来より大幅に小さくなり、
また過濃縮に当たって原汚泥を装置内に満杯にする汚
泥充満工程も必要なく、濃縮汚泥の排出を過濃縮工程
中に行うことによりほぼ連続的処理が可能となり、過
速度も大幅に向上する。As described above, in the present invention, the concentrated sludge is removed without returning the non-condensed sludge in the apparatus to the raw sludge storage tank 15 in stripping and discharging the concentrated sludge. Is much smaller than before,
Further, in the overconcentration, there is no need for a sludge filling step for filling the raw sludge into the apparatus. By discharging the concentrated sludge during the overconcentration step, almost continuous treatment becomes possible, and the overspeed is greatly improved.
さらに、従来法における未濃縮汚泥返送時には、真空
によってエレメント11上の濃縮汚泥の剥離や亀裂が発生
しないように、濃縮汚泥を厚くしておかねばならず、
過速度が極端に悪くなるが、本発明では未濃縮汚泥を返
送しないので、濃縮汚泥の厚さが薄くても操作可能であ
り、過速度をさらに早めることができる。Furthermore, at the time of returning the non-condensed sludge in the conventional method, the concentrated sludge must be thickened so that the concentrated sludge on the element 11 is not separated or cracked by vacuum.
Although the overspeed becomes extremely bad, the present invention does not return unconcentrated sludge, so that the operation can be performed even if the thickness of the concentrated sludge is thin, and the overspeed can be further accelerated.
原汚泥としてＮ浄水場の沈殿池から排泥された表−１
の如き性状の汚泥を、表−２に示す過濃縮装置を使用
して過濃縮を行った。Table 1 Waste sludge discharged from sedimentation basin of N water treatment plant
The sludge having the following properties was over-concentrated using the over-concentration apparatus shown in Table-2.
また、１サイクル当たりの各工程時間は、表−３の通
りとした。 Table 3 shows each process time per cycle.
以上の実験結果を表−４に示す。 Table 4 shows the above experimental results.
次に、濃縮汚泥の排出を過濃縮工程中に行った場
合、１サイクル当たりの各工程時間を表−５の通りと
し、その実験結果は表−６の通りであった。 Next, when the concentrated sludge was discharged during the over-concentration process, each process time per cycle was as shown in Table 5, and the experimental results were as shown in Table 6.
〔発明の効果〕 以上述べたように、本発明によれば、従来の未濃縮汚
泥の排出を行うことなく、そのまま液による濃縮汚泥
の剥離を行い、従来必要とされていた雑時間を大幅に短
縮し、過速度は向上し、消費電力その他のランニング
コストが低減され、付属する原汚泥貯槽の容量が小さく
なり、さらに筒状フィルターエレメントからの濃縮汚泥
の剥離時に圧力ガス又は圧力水を利用することにより一
層効果的な剥離を可能にすることができるという、多く
の顕著なる効果を奏するものである。 [Effects of the Invention] As described above, according to the present invention, without discharging the conventional unconcentrated sludge, the concentrated sludge is separated by the liquid as it is, and the conventionally required miscellaneous time is greatly reduced. Shortening, overspeed is improved, power consumption and other running costs are reduced, the capacity of the attached sludge storage tank is reduced, and pressure gas or water is used when stripping the concentrated sludge from the tubular filter element. Thereby, a more effective peeling can be made possible, and many remarkable effects are exhibited.
第１図は本発明で使用する過濃縮装置の１例を示す縦
断面図、第２図は第１図の過濃縮装置の一使用状態を
示す説明図、第３図及び第４図はそれぞれ本発明で使用
する過濃縮装置の上部の構造例を示す縦断面図、第５
図は従来の過濃縮装置の１例を示す縦断面図、第６図
は第５図の過濃縮装置の使用態様を示す説明図であ
る。 １……密閉槽、２……仕切板、３……汚泥濃縮部、４…
…集液部、５……汚泥流入弁、６……汚泥流入管、７…
…液弁、８……液流入管、９……空気抜弁、10…空
気抜管、11……筒状フィルターエレメント、12……濃縮
汚泥排出部、13……濃縮汚泥排出弁、14……濃縮汚泥排
出管、15……原汚泥貯槽、16……汚泥ポンプ、17……戻
し弁、18……戻し管、19……空気抜弁、20……空気抜
管、21……空気流入弁、22……空気管、23……真空弁、
24……真空管、25……水位計、26……ダイヤフラム、27
……空気室。FIG. 1 is a longitudinal sectional view showing an example of a superconcentrator used in the present invention, FIG. 2 is an explanatory view showing one use state of the superconcentrator of FIG. 1, and FIGS. 5 is a longitudinal sectional view showing an example of the structure of the upper part of the superconcentrator used in the present invention,
FIG. 1 is a longitudinal sectional view showing an example of a conventional superconcentrator, and FIG. 6 is an explanatory diagram showing a use mode of the superconcentrator of FIG. 1 ... closed tank, 2 ... partition plate, 3 ... sludge thickening section, 4 ...
… Liquid collection part, 5… Sludge inflow valve, 6… Sludge inflow pipe, 7…
... liquid valve, 8 ... liquid inflow pipe, 9 ... air vent valve, 10 ... air vent pipe, 11 ... cylindrical filter element, 12 ... concentrated sludge discharge section, 13 ... concentrated sludge discharge valve, 14 ... concentration Sludge discharge pipe, 15… Original sludge storage tank, 16… Sludge pump, 17… Return valve, 18… Return pipe, 19… Air vent valve, 20… Air vent pipe, 21… Air inlet valve, 22… ... air tube, 23 ... vacuum valve,
24 …… Vacuum tube, 25 …… Water gauge, 26 …… Diaphragm, 27
…… air chamber.
フロントページの続き (72)発明者 江川 真一郎 東京都港区港南１丁目６番27号 荏原イ ンフィルコ株式会社内 (72)発明者 衛藤 正徳 東京都港区港南１丁目６番27号 荏原イ ンフィルコ株式会社内 (56)参考文献 特開 昭63−93310（ＪＰ，Ａ)Continued on the front page (72) Inventor Shinichiro Egawa 1-6-27 Konan, Minato-ku, Tokyo Inside Ebara Infilco Co., Ltd. (72) Inventor Masanori Eto 1-27-27 Konan, Minato-ku, Tokyo Ebara Infilco Shares In-house (56) References JP-A-63-93310 (JP, A)
Claims (3)
部（４）とを区画形成し、汚泥濃縮部（３）内に一端を
開放して他端を閉鎖した筒状フィルターエレメント（1
1）を配設し、その開放端部を集液部（４）に連通した
汚泥の濾過濃縮装置を使用し、汚泥濃縮部（３）内に汚
泥を供給し、筒状フィルターエレメント（11）内に透過
した濾液を集液部（４）を経て槽外に流出させて汚泥の
濾過濃縮を行う方法において、 筒状フィルターエレメント（11）外側に付着した濃縮汚
泥を剥離、排出するに当たり、 汚泥の供給を停止し汚泥濃縮部（３）内の未濃縮汚泥を
排出することなく汚泥濃縮部（３）内上部を大気に開放
して該大気開放に伴う圧力差により前記筒状フィルター
エレメント（11）に付着した濃縮汚泥を剥離する工程
と、 剥離された濃縮汚泥を汚泥濃縮部（３）において沈澱さ
せる工程と、 汚泥濃縮部（３）の底部近傍に沈澱した濃縮汚泥を槽外
に排出する工程とを有することを特徴とする汚泥の濾過
濃縮方法。A cylinder having a sludge thickening section (3) and a liquid collecting section (4) formed in a closed tank (1), one end of which is opened and the other end is closed in the sludge thickening section (3). Filter element (1
1) is disposed, and the sludge is fed into the sludge concentration section (3) using a sludge filtration / concentration apparatus whose open end communicates with the liquid collection section (4), and the cylindrical filter element (11) is provided. In the method in which the filtrate permeated through the inside is drained out of the tank through the liquid collecting section (4) to filter and concentrate the sludge, the sludge is removed when the concentrated sludge attached to the outside of the cylindrical filter element (11) is separated and discharged. Is stopped and the upper part of the sludge concentration section (3) is opened to the atmosphere without discharging the unconcentrated sludge in the sludge concentration section (3). ), A step of separating the concentrated sludge that has separated off, a step of setting the separated concentrated sludge in the sludge concentration section (3), and discharging the concentrated sludge settled near the bottom of the sludge concentration section (3) to the outside of the tank. Of sludge characterized by having a process Way over-concentrated.
に付着した濃縮汚泥を剥離するに当たり、集液部（４）
を真空源に接続して濾液面を一旦上昇させた後に前記大
気開放を行なうことを特徴とする請求の範囲第１項記載
の汚泥の濾過濃縮方法。2. A liquid collecting section (4) for removing concentrated sludge adhering to the outside of the cylindrical filter element (11).
2. The method for filtering and condensing sludge as set forth in claim 1, wherein said step (a) is connected to a vacuum source, and said atmosphere is opened after said filtrate surface is once raised.
に付着した濃縮汚泥を剥離するに当たり、前記大気開放
後に集液部（４）に圧力ガス又は圧力水を導入すること
を特徴とする請求の範囲第１項又は第２項記載の汚泥の
濾過濃縮方法。3. A pressurized gas or water is introduced into the liquid collecting section (4) after opening to the atmosphere to remove concentrated sludge adhering to the outside of the cylindrical filter element (11). 3. The method for filtering and concentrating sludge according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271546A JP2581600B2 (en) | 1989-10-20 | 1989-10-20 | Method for overconcentration of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271546A JP2581600B2 (en) | 1989-10-20 | 1989-10-20 | Method for overconcentration of sludge |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6129509A Division JP2668010B2 (en) | 1994-04-20 | 1994-04-20 | Sludge filtration and concentration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03135406A JPH03135406A (en) | 1991-06-10 |
| JP2581600B2 true JP2581600B2 (en) | 1997-02-12 |
Family
ID=17501575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1271546A Expired - Lifetime JP2581600B2 (en) | 1989-10-20 | 1989-10-20 | Method for overconcentration of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2581600B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07136699A (en) * | 1993-11-16 | 1995-05-30 | Nagano Yuki Kk | Method and apparatus for filtering mud |
| WO2010150790A1 (en) * | 2009-06-23 | 2010-12-29 | メタウォーター株式会社 | Suction filtration/concentration method and suction filtration/concentration device |
| JP5968690B2 (en) * | 2012-06-20 | 2016-08-10 | 水ｉｎｇ株式会社 | Filtration concentration system and operation method of filtration concentration system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6393310A (en) * | 1986-10-08 | 1988-04-23 | Nippon Atom Ind Group Co Ltd | Oil-water separator provided with regeneration function |
| JPS63107711A (en) * | 1986-10-24 | 1988-05-12 | Ebara Corp | Filter for removing clads in boiler condensate |
-
1989
- 1989-10-20 JP JP1271546A patent/JP2581600B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03135406A (en) | 1991-06-10 |
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