JPH01189358A - Sludge dehydration method and apparatus using decanter type centrifugal separator - Google Patents
Sludge dehydration method and apparatus using decanter type centrifugal separatorInfo
- Publication number
- JPH01189358A JPH01189358A JP63012734A JP1273488A JPH01189358A JP H01189358 A JPH01189358 A JP H01189358A JP 63012734 A JP63012734 A JP 63012734A JP 1273488 A JP1273488 A JP 1273488A JP H01189358 A JPH01189358 A JP H01189358A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- flocculant
- supplied
- cylinder
- rotating cylinder
- 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.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 119
- 230000018044 dehydration Effects 0.000 title claims abstract description 9
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 22
- 238000000926 separation method Methods 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 239000008394 flocculating agent Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 9
- 208000005156 Dehydration Diseases 0.000 abstract 1
- 230000008719 thickening Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011084 recovery Methods 0.000 description 5
- 239000000701 coagulant Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Centrifugal Separators (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、デカンタ型遠心分離機を用いて、上下水、し
尿、産業排水処理工程等で発生する各種汚泥を従来以上
に効率よく脱水する汚泥脱水方法及び装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention uses a decanter-type centrifuge to dewater various types of sludge generated in water, sewage, human waste, industrial wastewater treatment processes, etc. more efficiently than ever before. The present invention relates to a sludge dewatering method and device.
従来一般に、上下水、し尿、産業排水処理工程等で発生
する各種汚泥を濃縮脱水処理するのにデカンタ型遠心分
離機が用いられている。BACKGROUND OF THE INVENTION Conventionally, decanter-type centrifuges have been generally used to concentrate and dewater various types of sludge generated in water, sewage, human waste, industrial wastewater treatment processes, and the like.
上記のデカンタ型遠心分離機は、第４図に示すように、
軸受２．２により軸受支持されて高速度で回転する回転
筒１と、該回転筒１と同方向に回転する内筒５及びスク
リュー羽根６から成るスクリューコンベヤとが同心に設
けられており、回転軸中心には汚泥供給管１１が配設さ
れた構成となっている。As shown in Figure 4, the decanter type centrifuge described above has the following features:
A rotating cylinder 1 that is supported by a bearing 2.2 and rotates at high speed, and a screw conveyor consisting of an inner cylinder 5 and screw blades 6 that rotate in the same direction as the rotating cylinder 1 are provided concentrically. A sludge supply pipe 11 is arranged at the center of the shaft.
回転筒１と内筒５とは差動機７により所要の回転差が付
与され、スクリューコンベヤは濃縮汚泥１９を沈殿汚泥
排出口３に向けて搬送する。また回転筒１は円錐部１ａ
と円筒部１ｂとから成り、該円錐部１ａの末端部にはス
クリューコンベヤによりドライビーチ部１７を経て搬送
されてくる濃縮脱水汚泥を排出するための沈殿汚泥排出
口３が設けられ、これと反対側の前記円筒部１ｂの末端
部には分離された分離液１８を排出するためのダム４が
設けられている。A required rotation difference is applied between the rotary cylinder 1 and the inner cylinder 5 by a differential 7, and the screw conveyor conveys the concentrated sludge 19 toward the settled sludge discharge port 3. In addition, the rotating cylinder 1 has a conical portion 1a.
and a cylindrical part 1b, and a precipitated sludge discharge port 3 is provided at the end of the conical part 1a for discharging the concentrated dehydrated sludge conveyed by a screw conveyor via the dry beach part 17, and a A dam 4 for discharging the separated liquid 18 is provided at the end of the side cylindrical portion 1b.
上記構成のデカンタ型遠心分離機において、汚泥供給管
１１を通して分離機内筒５内の汚泥供給部８へ供給され
る汚泥は、円筒壁に設けた汚泥吐出ノズル１４を経て円
錐部１ａに隣接する円筒部１ｂ内部のプールへ放出され
、高速回転する回転筒１の遠心分離作用を受けて沈殿汚
泥と分離液とに分離され、それぞれ沈殿汚泥排出口３と
ダム４とから機外に排出される。In the decanter-type centrifugal separator having the above configuration, the sludge supplied to the sludge supply section 8 in the separator inner cylinder 5 through the sludge supply pipe 11 passes through the sludge discharge nozzle 14 provided on the cylinder wall and into the cylinder adjacent to the conical part 1a. The sludge is discharged into a pool inside the section 1b, separated into precipitated sludge and separated liquid by the centrifugal action of the rotating cylinder 1 rotating at high speed, and discharged from the precipitated sludge discharge port 3 and the dam 4 to the outside of the machine.
デカンタ型遠心分離機で汚泥を脱水する場合には第５図
（ａ）、（ｂ）、（ｃ）に示されているような手法で、
高分子凝集剤等を供給汚泥に添加し、該汚泥を調質する
方法が一般に用いられている。これらの汚泥調質方法の
一つを用いて凝集剤を添加された汚泥は、凝集フロック
を形成し、回転筒１の高速回転による遠心力で分離液１
８と濃縮汚泥１９とに分離される。濃縮汚泥１９は、内
筒５及びスクリュー羽根６からなるスクリューコンベヤ
によって搬送され、回転筒１の外に排出され、分離液１
８はスクリュー羽根６に沿って流下し、ダム４から回転
筒１の外に排出される。When dewatering sludge using a decanter type centrifuge, use the method shown in Figure 5 (a), (b), and (c).
Generally, a method is used in which a polymer flocculant or the like is added to the supplied sludge and the sludge is refined. Sludge to which a coagulant has been added using one of these sludge conditioning methods forms coagulated flocs, and the centrifugal force caused by the high-speed rotation of the rotating tube 1 causes the separated liquid 1 to
8 and thickened sludge 19. The thickened sludge 19 is conveyed by a screw conveyor consisting of an inner cylinder 5 and screw blades 6, is discharged outside the rotary cylinder 1, and is separated into a separated liquid 1.
8 flows down along the screw blades 6 and is discharged from the dam 4 to the outside of the rotating cylinder 1.
第５図（ａ）、（ｂ）、（ｅ）に示した従来の汚泥調質
方法のうち、同図の（ａ）及び（ｂ）に示すものは、い
ずれも一種類の高分子凝集剤を供給汚泥に添加して汚泥
を調質するものであり、（ａ）は予め高分子凝集剤で調
質した汚泥を遠心分離機に供給する例、（ｂ）は汚泥と
高分子凝集剤とを各別に遠心分離機内に供給し、分離機
の回転筒と内筒の間の領域で汚泥に高分子凝集剤を添加
する例を示している。なお（ｂ）は、特公昭５２−１６
２６８号公報に詳細に説明されている。Among the conventional sludge refining methods shown in Fig. 5 (a), (b), and (e), the methods shown in Fig. 5 (a) and (b) all use one type of polymer flocculant. is added to the supplied sludge to refine the sludge. (a) is an example in which sludge that has been tempered with a polymer flocculant is fed to a centrifuge, and (b) is an example in which sludge and polymer flocculant are added to the centrifuge. This example shows an example in which the sludge is supplied separately into a centrifugal separator, and a polymer flocculant is added to the sludge in the area between the rotating cylinder and the inner cylinder of the separator. In addition, (b) is
This is explained in detail in Japanese Patent No. 268.
第５図（ｅ）に示す例は、二種類の凝集剤を汚泥に添加
するものであり、この種のものとしては、特開昭５６−
８７５００号公報及び特開昭５７−３２７９７号公報に
二種類の高分子凝集剤を添加する例が、また類似技術と
して特開昭６１−２５７２５６号公報に一種類の高分子
凝集剤と一種類の無機凝集剤を併用して添加する例がそ
れぞれ開示されている。The example shown in FIG. 5(e) is one in which two types of flocculants are added to sludge, and this type of flocculant is
87500 and JP-A-57-32797 disclose an example of adding two types of polymer flocculants, and as a similar technique, JP-A-61-257256 discloses an example of adding one type of polymer flocculant and one type of polymer flocculant. Examples are disclosed in which an inorganic flocculant is added in combination.
〔発明が解決しようとする問題点〕・
近年、デカンタ型遠心分離機の発達により、汚泥は凝集
剤を添加せずに濃縮できるよ５になったのであるが、そ
れでも凝集剤による汚泥の調質を行なわない場合、供給
汚泥中に懸濁している物質の回収率は約９０（％）どま
りである。そこで第５図（ａ）、（ｂ）、（ｃ）につい
て説明したように、デカンタ型遠心分離機で汚泥を脱水
する場合、遠心分離様回転筒内部における遠心力による
汚泥の沈降・圧密・脱水作用を促進する目的で、凝集剤
を添加し汚泥の調質を行なっているのであるが、この場
合凝集剤が一種類であるか二種類であるかを問わず、凝
集剤は沈降・圧密・脱水作用の促進を一括して行なう目
的で供給汚泥に添加されており、遠心分離様回転筒内部
における沈降・圧密までの分離・濃縮とその後に起こる
脱水を分けて調質することは考慮されておらず、これら
従来の方法には次のような問題点がある。[Problems to be solved by the invention] In recent years, with the development of decanter-type centrifuges, it has become possible to concentrate sludge without adding flocculants. If this is not done, the recovery rate of the substances suspended in the feed sludge is only about 90 (%). Therefore, as explained in Fig. 5 (a), (b), and (c), when dewatering sludge using a decanter-type centrifuge, sedimentation, consolidation, and dewatering of sludge due to centrifugal force inside the centrifugal-like rotating cylinder In order to promote the action, flocculants are added to refine the sludge, but in this case, regardless of whether there is one type of flocculant or two types of flocculants, the flocculant will cause sedimentation, consolidation, and It is added to the supplied sludge for the purpose of promoting the dewatering effect all at once, and it is not considered to separate and refine the separation and concentration up to sedimentation and consolidation inside the centrifugal-like rotating cylinder and the subsequent dehydration. However, these conventional methods have the following problems.
すなわち第５図（ａ） 、（ｂ）に示す例では一種類の
高分子凝集剤を汚泥に添加する調質方法であるため、コ
ストも安（取扱いも容易といった利点があるが、回転筒
の外に排出された沈殿汚泥の含水率が高く、後処理工程
である投棄、埋め立て、乾燥、焼却等の処理処分に要す
るコストが割高になるという欠点があった０
また、第５図（Ｃ）のように二種類の凝集剤を添加する
汚泥調質方法は、同図（ａ）、（ｂ）の汚泥調質方法に
比べて、回転筒から排出される沈殿汚泥の含水率を低下
させる効果はあ 〔るものの、二種類の凝集剤を使用す
るため、それぞれの凝集剤を供給するための各別の凝集
剤供給設備をデカンタ型遠心分離機に併設する必要があ
り、このため設備全体の建設費が高くなるばかりでな（
、凝集剤の使用量が多くなるため運転コストも高くなる
という欠点があった。また、前記特開昭５７−３２７９
７号公報に開示の技術は、天然高分子凝集剤の溶解に酢
酸ないし塩酸を使用するものであり、前記特開昭６１−
２５７２５６号公報に開示の技術は、硫酸鉄を使用する
ものであるため、強酸による装置の腐食があること、取
扱いにも注意を要することなどの問題があり、沈殿汚泥
の含水率が低下し、爾後の処理処分費用が安くなるとい
った効果があるにもかかわらず、さほど広（は用いられ
ていない実状にある。In other words, in the examples shown in Figures 5(a) and 5(b), the treatment method involves adding one type of polymer flocculant to the sludge, which has the advantage of being low cost (and easy to handle), but it also has the advantage of being easy to handle. The moisture content of the precipitated sludge discharged outside was high, and the cost of post-treatment processes such as dumping, landfilling, drying, and incineration was relatively high. The sludge refining method in which two types of flocculants are added as shown in the figure is more effective in lowering the water content of the settled sludge discharged from the rotating tube than the sludge refining methods shown in (a) and (b) of the same figure. However, since two types of flocculants are used, it is necessary to install separate flocculant supply equipment to the decanter type centrifuge to supply each type of flocculant. Construction costs will only increase (
However, since the amount of flocculant used is large, the operating cost is also high. Also, the above-mentioned Japanese Patent Application Laid-Open No. 57-3279
The technique disclosed in Publication No. 7 uses acetic acid or hydrochloric acid to dissolve a natural polymer flocculant, and is similar to that disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1986-
Since the technology disclosed in Japanese Patent No. 257256 uses iron sulfate, there are problems such as corrosion of the equipment due to strong acids and the need for care in handling, resulting in a decrease in the water content of the settled sludge. Although it has the effect of reducing subsequent processing and disposal costs, it is not widely used.
本発明は、以上に説明した汚泥脱水技術における問題点
を解決しようとするものである。The present invention aims to solve the problems in the sludge dewatering technology described above.
問題点を解決するための手段〕
本発明は、第５図（ａ）、（ｂ）、（Ｃ）に示される如
き従来の汚泥脱水技術における問題点を解決すべくなさ
れたものであり、本発明による汚泥の脱水方法は、円錐
部及び円筒部から成る回転筒と、該回転筒内に同心的に
配設された内筒及びスクリュー羽根から成るスクリュー
コンベヤとを備えたデカンタ型遠心分離機を用い、該遠
心分離機の運転にあたり、脱水処理されるべき汚泥を供
給するとともに、該供給汚泥の分離・濃縮・脱水作用を
促進するための所要量の一種類の凝集剤を遠心分離機内
へ供給して、前記回転筒円錐部末端部の排出口から脱水
された濃縮汚泥を排出するようにした汚泥の脱水方法で
あって、前記凝集剤の所要全量の１０（％）ないし４０
（％）量を前記回転筒円錐部に隣接する円筒部内領域
に供給するとともＫ、残余の９０ （％）ないし６０優
）量を前記回転筒円錐部内領域に供給することを特徴と
するものである。Means for Solving the Problems] The present invention has been made to solve the problems in conventional sludge dewatering techniques as shown in FIGS. 5(a), (b), and (C). The sludge dewatering method according to the invention uses a decanter-type centrifugal separator equipped with a rotating cylinder consisting of a conical part and a cylindrical part, and a screw conveyor consisting of an inner cylinder and screw blades arranged concentrically within the rotating cylinder. When operating the centrifuge, the sludge to be dehydrated is supplied, and the required amount of one type of flocculant is supplied into the centrifuge to promote separation, concentration, and dewatering of the supplied sludge. 10(%) to 40% of the total required amount of the flocculant, and the dewatered concentrated sludge is discharged from the discharge port at the end of the conical part of the rotary cylinder.
(%) amount is supplied to the internal region of the cylindrical portion adjacent to the rotating cylinder conical portion, and the remaining 90 (%) to 60% amount is supplied to the internal region of the rotating cylinder conical portion. be.
また、本発明による汚泥の脱水装置は、円錐部及び円筒
部から成る回転筒と、該回転筒内に同心的に配設され該
回転筒と回転差速をつけて駆動される内筒及び該内筒に
固定のスクリュー羽根から成るスクリューコンベヤと、
前記内筒中心部に配設された汚泥供給管とを備え、前記
回転筒円錐部末端部の排出口より濃縮汚泥を排出し、前
記回転筒円筒部末端部のダムより分離液を排出するよう
にしたデカンタ型遠心分離機において、
前記汚泥供給管に並設して前記回転筒円錐部に隣接する
円筒部内領域に凝集剤を供給するための第１凝集剤供給
管と前記回転筒円錐部内領域に凝集剤を供給するための
第２凝集剤供給管とを設けたことを特徴とするものであ
る。The sludge dewatering device according to the present invention also includes a rotating cylinder consisting of a conical part and a cylindrical part, an inner cylinder arranged concentrically within the rotating cylinder and driven at a rotational speed differential with the rotating cylinder, and A screw conveyor consisting of screw blades fixed to an inner cylinder,
and a sludge supply pipe arranged at the center of the inner cylinder, so that concentrated sludge is discharged from an outlet at the end of the conical part of the rotating cylinder, and separated liquid is discharged from a dam at the end of the cylindrical part of the rotating cylinder. In the decanter type centrifugal separator, a first flocculant supply pipe is arranged in parallel with the sludge supply pipe and is configured to supply a flocculant to an internal region of the cylindrical part adjacent to the rotary cylinder conical part, and a first flocculant supply pipe and an internal region of the rotary cylinder conical part. A second flocculant supply pipe for supplying a flocculant to the flocculant is provided.
本発明においては、デカンタ型遠心分離機の回転筒円錐
部に隣接する円筒部内領域に一種類の凝集剤の所要全量
の１０（％）ないし４０（％）量を供給するようにし、
残余の９０ （％）ないし６０ （％）量を回転筒円錐
部内領域に供給するようにしたので、前記円筒部内領域
では、凝集剤によって分離・濃縮作用が促進され、また
前記円錐部内領域では、凝集剤によって脱水作用が促進
されることＫなり、一種類の凝集剤の所要全量を一括し
て添加する従来の脱水技術と比較するとほとんど同程度
の設備建設費と運転コストでありながら、回転筒の外に
排出される沈殿汚泥の含水率を２（％）ないし３（％）
低く抑えることができた。In the present invention, an amount of 10 (%) to 40 (%) of the total required amount of one type of flocculant is supplied to the inner region of the cylindrical portion adjacent to the rotating cylinder conical portion of the decanter type centrifuge,
Since the remaining 90 (%) to 60 (%) amount is supplied to the inner region of the conical portion of the rotating cylinder, the separation and concentration action is promoted by the flocculant in the inner region of the cylindrical portion, and in the inner region of the conical portion, The flocculant accelerates the dehydration effect, and compared to conventional dehydration technology in which the entire required amount of one type of flocculant is added at once, the equipment construction cost and operating cost are almost the same, but the rotary cylinder The moisture content of the settled sludge discharged outside is 2 (%) to 3 (%).
I was able to keep it low.
次に、第１図、第２図および第３図（ａ）、（ｂ）に示
した本発明の実施例について説明する。Next, the embodiments of the present invention shown in FIGS. 1, 2, and 3(a) and (b) will be described.
第１図に示す本発明に用いるデカンタ型遠心分離機は、
基本的には第４図に示すものと同様で、軸受２．２にて
支持され高速度で回転する回転筒１と、該回転筒１の内
部で差動機７により回転差速をつけて駆動される回転筒
１と同心の内ｆ＃Ｊ５及び該内筒５に固定のスクリュー
羽根６から成るスクリューコンベヤとを備え、回転筒１
は互いに一体的に接続された円錐部１ａと円筒部１ｂと
から成り、該円錐部１ａの末端部には沈殿汚泥排出用の
排出口３が、また該円筒部１ｂの末端部には分離液排出
用のダム４が設けられている。The decanter type centrifuge used in the present invention shown in FIG.
Basically, it is similar to the one shown in Fig. 4, and includes a rotating cylinder 1 supported by a bearing 2.2 and rotating at a high speed, and a differential gear 7 driving the rotating cylinder 1 at a differential speed. The rotary cylinder 1 is equipped with a screw conveyor consisting of an inner f#J5 concentric with the rotating cylinder 1 and a screw blade 6 fixed to the inner cylinder 5.
It consists of a conical part 1a and a cylindrical part 1b which are integrally connected to each other, and the conical part 1a has a discharge port 3 for discharging the settled sludge at the end thereof, and the separating liquid is provided at the end of the cylindrical part 1b. A dam 4 for discharge is provided.
前記内筒５の内部は汚泥供給部８、分離・濃縮用凝集剤
供給部９及び脱水用凝集剤供給部１０に区画され、また
該内筒５の中心部には汚泥供給管１１、分離・濃縮用凝
集剤供給管１２及び脱水用凝集剤供給管１３が配設され
ている。The inside of the inner cylinder 5 is divided into a sludge supply section 8, a flocculant supply section 9 for separation and concentration, and a flocculant supply section 10 for dewatering. A flocculant supply pipe 12 for concentration and a flocculant supply pipe 13 for dehydration are provided.
運転中のデカンタ型遠心分離機へ汚泥供給管１１を通し
て供給される汚泥は、該供給管１１の端部開口１１ａか
ら汚泥供給部８に入り、内筒５の筒壁に設けた汚泥吐出
ノズル１４を通して回転筒１の円筒部１ｂ内に導入され
遠心分離機による分離・濃縮作用を受ける。Sludge supplied to the decanter-type centrifuge in operation through the sludge supply pipe 11 enters the sludge supply section 8 from the end opening 11a of the supply pipe 11, and passes through the sludge discharge nozzle 14 provided on the wall of the inner cylinder 5. It is introduced into the cylindrical portion 1b of the rotary cylinder 1 through the centrifugal separator and subjected to the separation and concentration action of the centrifuge.
同じく、分離・濃縮用凝集剤供給管１２を通して供給さ
れる凝集剤は、該供給管の端部開口１２ａから分離・濃
縮用凝集剤供給部９に入り、内筒５の筒壁に設けた分離
・濃縮用凝集剤吐出ノズル１５を通して円錐部１ａに隣
接する円筒部１ｂ内忙導入され、遠心分離機による供給
汚泥の沈降・圧密作用を促進し、さらに脱水用凝集剤供
給管１３を通して供給される凝集剤は、該供給管の端部
開口１３ａから脱水用凝集剤供給部１０に入り、内筒５
の筒壁に設けた脱水用凝集剤吐出ノズル１６を通して回
転筒１の円錐部１ａ内に導入され、遠心分離機による濃
縮汚泥の脱水作用を促進する。Similarly, the flocculant supplied through the separation/concentration flocculant supply pipe 12 enters the separation/concentration flocculant supply section 9 from the end opening 12a of the supply pipe, and enters the separation/concentration flocculant supply section 9 provided on the wall of the inner cylinder 5. - The flocculant for concentration is introduced into the cylindrical part 1b adjacent to the conical part 1a through the discharge nozzle 15, promotes the sedimentation and compaction of the supplied sludge by the centrifuge, and is further supplied through the flocculant supply pipe 13 for dewatering. The flocculant enters the dewatering flocculant supply section 10 from the end opening 13a of the supply pipe, and enters the inner cylinder 5.
The coagulant for dewatering is introduced into the conical part 1a of the rotary cylinder 1 through a discharge nozzle 16 provided on the cylinder wall, and promotes the dewatering action of the thickened sludge by the centrifugal separator.
遠心分離機の内筒５の内部中心部に配設される汚泥供給
管１１、分離・濃縮用凝集剤供給管１２及び脱水用凝集
剤供給管１３は、第１図及び第２図に示すような３重管
に構成してもよいが、第３図Ｃ＆）及び（ｂ）にそれぞ
れ断面図示のような多重管の構成にしてもよい。A sludge supply pipe 11, a flocculant supply pipe 12 for separation and concentration, and a flocculant supply pipe 13 for dewatering, which are arranged in the center of the inner cylinder 5 of the centrifugal separator, are as shown in FIGS. 1 and 2. Alternatively, a multi-tube structure as shown in cross-section in FIGS. 3C&) and (b) may also be used.
上記したようなデカンタ型遠心分離機を用いた本発明実
施例による汚泥脱水方法は、次のようにして実施される
。まず、汚泥供給管１１の端部開口１１ａから吐出した
汚泥は、汚泥供給部８で回転加速され、汚泥吐出ノズル
１４から回転筒１の円筒部１ｂ内部に供給され、該汚泥
吐出ノズル１４付近に設けた分離・濃縮用凝集剤吐出ノ
ズル１５から全使用量の１０（％）ないし４０ （％）
量、代表的には２０（％）量供給される凝集剤と混合さ
れて、分離に必要なフロックを形成する。The sludge dewatering method according to the embodiment of the present invention using the decanter type centrifuge as described above is carried out as follows. First, the sludge discharged from the end opening 11a of the sludge supply pipe 11 is rotated and accelerated in the sludge supply section 8, and is supplied from the sludge discharge nozzle 14 into the cylindrical portion 1b of the rotary cylinder 1, and near the sludge discharge nozzle 14. 10 (%) to 40 (%) of the total amount used from the provided separation/concentration flocculant discharge nozzle 15
The flocculant is mixed with a flocculant provided in an amount, typically 20(%), to form the flocs required for separation.
フロックを形成した汚泥は、遠心力により分離され回転
筒１の内壁に沈降する。汚泥から分離した水は回転筒１
の内部を流下し、円筒部ｉ ｂの末端部のダム４から分
離液として排出される。沈降した汚泥はスクリューコン
ベヤにより濃縮されながら沈殿汚泥排出口３側へ搬送さ
れる。搬送されてきた濃縮汚泥はまだ流動性を有するた
め、回転筒の円錐部１ａにあるビーチ部で遠心力による
すべり現象を起こし、スクリューコンベヤの搬送力とす
べり分力とにより激しく攪拌される。このように汚泥が
攪拌されている部分に脱水用凝集剤吐出ノズル１６から
残りの凝集剤が全使用量の９０ （％）ないし６０ （
％）量、代表的には８０（％）量供給され、濃縮汚泥の
脱水作用を一層促進することになる。The sludge that has formed flocs is separated by centrifugal force and settles on the inner wall of the rotating cylinder 1. The water separated from the sludge is transferred to rotating cylinder 1.
and is discharged as a separated liquid from the dam 4 at the end of the cylindrical portion ib. The settled sludge is conveyed to the settled sludge discharge port 3 side while being concentrated by the screw conveyor. Since the transported concentrated sludge still has fluidity, it causes a sliding phenomenon due to centrifugal force at the beach in the conical portion 1a of the rotating cylinder, and is violently agitated by the transporting force of the screw conveyor and the sliding force. The remaining flocculant is discharged from the dewatering flocculant discharge nozzle 16 into the area where the sludge is being stirred, from 90 (%) to 60 (%) of the total usage amount.
%) amount, typically 80(%) amount, to further promote the dewatering effect of the thickened sludge.
第５図（ａ）、（ｂ）及び（ｅ）に示す例を比較例とし
、高分子凝集剤をデカンタ型遠心分離機の円筒部と円錐
部の２箇所に分けて分注した本発明実施例とを比較して
みると、それぞれの高分子凝集剤の添加率と排出された
沈殿汚泥の含水率は、次表のようになる。The examples shown in FIGS. 5(a), (b), and (e) are taken as comparative examples, and the present invention was implemented in which the polymer flocculant was separately dispensed into two parts, a cylindrical part and a conical part of a decanter-type centrifuge. When compared with the example, the addition rate of each polymer flocculant and the water content of the discharged settled sludge are as shown in the following table.
高分子凝集剤添加量は、ドライソリッド（絶対乾燥固形
物）Ｄ、Ｓ、に対する重量（チ）である。The amount of polymer flocculant added is the weight (chi) relative to dry solids (absolutely dry solids) D and S.
実験対象汚泥・・・・・・下水消化汚泥使用実験機・・
・・・・・・デカンタ型遠心分離機回転筒内径３５６
ｍｍ
実験機遠心効果・・・・２，１００Ｇ
スクリユーコンベヤ回転差速・・・５ｒｐｍ供給汚泥量
・・・・ ・・４ ｍ ／ ｈ上記表かられかるように
、凝集剤を添加しない場合、通常汚泥回収率が５０（％
）ないし９０（％）であるのに対して、高分子凝集剤を
添加することにより、比較例（ａ）、（ｂ）、（ｅ）及
び実施例では、汚泥回収率がいずれも９８（％）台と高
率であって、汚泥回収率の点では比較例、実施例を通し
てそれ程の差はみられない。しかしながら、一種類の高
分子凝集剤 ゆを添加する比較例（ａ）及び（ｂ）と本
発明の実施例との比較かられかるように、排出沈殿汚泥
含水率は、本発明によれば２．４（％）ないし２．６（
％）も低い値となり、この種の汚泥含水率を１（％）低
くすることが爾後の沈殿汚泥処理に大きな影響を与える
ことを考慮すれば−、本発明による汚泥含水率の低減効
果は顕著なものというべきである。Sludge to be tested: Experimental machine using sewage digested sludge.
... Decanter type centrifuge rotating cylinder inner diameter 356
mm Experimental machine centrifugal effect: 2,100G Screw conveyor rotation differential speed: 5 rpm Amount of sludge supplied: 4 m/h As can be seen from the table above, when no flocculant is added, Usually the sludge recovery rate is 50 (%)
) to 90 (%), whereas in Comparative Examples (a), (b), (e) and Examples, by adding a polymer flocculant, the sludge recovery rate was all 98 (%). ), and there is no significant difference in sludge recovery rate between the comparative example and the example. However, as can be seen from the comparison between Comparative Examples (a) and (b) in which one type of polymer flocculant was added and the Example of the present invention, the water content of the discharged settled sludge is 2. .4(%) to 2.6(
%), and considering that lowering the water content of this type of sludge by 1 (%) has a great effect on the subsequent treatment of settled sludge, the effect of reducing the water content of sludge by the present invention is remarkable. It should be called something.
本発明の実施例と比較例（Ｃ）との比較では、汚泥回収
率及び排出沈殿汚泥含水率のいずれも大差はない。しか
しながら比較例（ｅ）では二種類の高分子凝集剤を各別
に供給するための設備を必要とするため、汚泥脱水装置
の設備全体として建設費が高（なるばかりでな（、高分
子凝集剤の使用量も本発明実施例の２．５倍にもなって
運転コストも高くなる。したがって、本発明によれば比
較例（Ｃ）に比べて建設費及び運転コストの面で大幅の
低減が期待できる。In a comparison between Examples of the present invention and Comparative Example (C), there is no significant difference in either the sludge recovery rate or the water content of the discharged settled sludge. However, in Comparative Example (e), since equipment is required to supply two types of polymer flocculants separately, the construction cost for the entire sludge dewatering equipment is high. The usage amount is also 2.5 times that of the example of the present invention, and the operating cost is also higher. Therefore, according to the present invention, compared to the comparative example (C), there is a significant reduction in construction cost and operating cost. You can expect it.
第１図は本発明の汚泥脱水方法を実施するデカンタ型遠
心分離機を用いた汚泥脱水装置の一実施例を示した側断
面図、第２図は第１図のＡ−Ａ線に沿う汚泥供給管、分
離・濃縮用凝集剤供給管及び脱水用凝集剤供給管から成
る３重管の断面図、第３図（ａ）、（ｂ）は第２図とは
異なる汚泥供給管、分離・濃縮用凝集剤供給管及び脱水
用凝集剤供給管から成る集合管の断面図、第４図はデカ
ンタ型遠心分離機の側断面図、第５図（ａ）、（ｂ）、
（ｅ）は従来の汚泥調質方法の説明図である。
１・・・・・回転筒
２・・・・・軸 受
３ ・・・・・ 沈殿汚泥排出口
４ ・・・・・ ダ ム
５ ・・・・・ 内 筒
６ ・・・・ スクリュー羽根
７・・・・・差動機
８ ・・・・・ 汚泥供給部
９ ・・・・ 分離・濃縮用凝集剤供給部１０ ・・
・・・ 脱水用凝集剤供給部１１ ・・・・・ 汚泥
供給管
１２ ・・・・・ 分離・濃縮用凝集剤供給管１３
・・・・・ 脱水用凝集剤供給管１４ ・・・・
汚泥吐出ノズル
１５ ・・・・・ 分離・濃縮用凝集剤吐出ノズル１
６ ・・・・ 脱水用凝集剤吐出ノズル１７ ・・
・・・ ドライビーチ部
第１図
第４図FIG. 1 is a side sectional view showing an embodiment of a sludge dewatering device using a decanter-type centrifugal separator for carrying out the sludge dewatering method of the present invention, and FIG. 2 is a sludge view taken along line A-A in FIG. Cross-sectional views of a triple pipe consisting of a supply pipe, a flocculant supply pipe for separation/concentration, and a flocculant supply pipe for dewatering, Figures 3 (a) and (b) show different sludge supply pipes, separation/concentration pipes, and A cross-sectional view of a collecting pipe consisting of a flocculant supply pipe for concentration and a flocculant supply pipe for dehydration, Figure 4 is a side cross-sectional view of a decanter type centrifuge, Figures 5 (a), (b),
(e) is an explanatory diagram of a conventional sludge refining method. 1...Rotating tube 2...Bearing 3...Settled sludge discharge port 4...Dam 5...Inner tube 6...Screw blade 7 ... Differential machine 8 ... Sludge supply section 9 ... Separation/concentration flocculant supply section 10 ...
... Coagulant supply section for dewatering 11 ... Sludge supply pipe 12 ... Coagulant supply pipe for separation and concentration 13
... Dewatering flocculant supply pipe 14 ...
Sludge discharge nozzle 15 ... Separation/concentration flocculant discharge nozzle 1
6... Dewatering flocculant discharge nozzle 17...
・・・ Dry beach section Figure 1 Figure 4
Claims (1)
同心的に配設された内筒及びスクリュー羽根から成るス
クリューコンベヤとを備えたデカンタ型遠心分離機を用
い、該遠心分離機の運転にあたり、脱水処理されるべき
汚泥を供給するとともに、該供給汚泥の分離・濃縮・脱
水作用を促進するための所要量の一種類の凝集剤を遠心
分離機内へ供給して、前記回転筒円錐部末端部の排出口
から脱水された濃縮汚泥を排出するようにした汚泥の脱
水方法であって、 前記凝集剤の所要全量の１０（％）ないし ４０（％）量を前記回転筒円錐部に隣接する円筒部内領
域に供給するとともに、残余の９０（％）ないし６０（
％）量を前記回転筒円錐部内領域に供給することを特徴
とするデカンタ型遠心分離機を用いる汚泥の脱水方法。 ２、前記凝集剤が高分子凝集剤であり、該高分子凝集剤
を前記回転筒円錐部に隣接する円筒部内領域に対して所
要全量の２０（％）量を、また前記回転筒円錐部内領域
に残余の８０（％）量を供給することを特徴とする請求
項１記載のデカンタ型遠心分離機を用いる汚泥の脱水方
法。 ３、円錐部及び円筒部かな成る回転筒と、該回転筒内に
同心的に配設され該回転筒と回転差速をつけて駆動され
る内筒及び該内筒に固定のスクリュー羽根から成るスク
リューコンベヤと、前記内筒中心部に配設された汚泥供
給管とを備え、前記回転筒円錐部末端部の排出口より濃
縮汚泥を排出し、前記回転筒円筒部末端部のダムより分
離液を排出するようにしたデカンタ型遠心分離機におい
て、 前記汚泥供給管に並設して前記回転筒円錐部に隣接する
円筒部内領域に凝集剤を供給するための第１凝集剤供給
管と前記回転筒円錐部内領域に凝集剤を供給するための
第２凝集剤供給管とを設けたことを特徴とする汚泥の脱
水装置。 ４、前記回転筒の内部が、該回転筒円筒部側から円錐部
側にかけて汚泥供給部、分離・濃縮用凝集剤供給部及び
脱水用凝集剤供給部に区画され、前記汚泥供給管からの
供給汚泥は汚泥供給部及び内筒に設けた汚泥吐出ノズル
を介して前記回転筒円筒部内領域に供給され、前記第１
凝集剤供給管からの供給凝集剤は、前記分離・濃縮用凝
集剤供給部及び前記内筒に設けた分離・濃縮用凝集剤吐
出ノズルを介して前記回転筒円錐部に隣接する円筒部内
領域に供給され、さらに、前記第２凝集剤供給管からの
供給凝集剤は、前記脱水用凝集剤供給部及び前記内筒に
設けた脱水用凝集剤吐出ノズルを介して前記回転筒円錐
部内領域に供給されるようにしたことを特徴とする請求
項３記載の汚泥の脱水装置。[Claims] 1. A decanter-type centrifugal separator equipped with a rotating cylinder consisting of a conical part and a cylindrical part, and a screw conveyor consisting of an inner cylinder and screw blades arranged concentrically within the rotating cylinder. When operating the centrifuge, the sludge to be dehydrated is supplied, and the required amount of one type of flocculant is supplied into the centrifuge to promote separation, concentration, and dewatering of the supplied sludge. 10(%) to 40(%) of the total required amount of the flocculant, the method comprising: discharging the dehydrated thickened sludge from an outlet at the end of the conical part of the rotating cylinder; is supplied to the internal region of the cylindrical part adjacent to the rotating cylinder conical part, and the remaining 90(%) to 60(%)
%) to the internal region of the rotary cylinder conical part. 2. The flocculant is a polymer flocculant, and the polymer flocculant is applied in an amount of 20 (%) of the required total amount to the inner region of the cylindrical portion adjacent to the conical portion of the rotary tube, and to the inner region of the conical portion of the rotary tube. 2. A method for dewatering sludge using a decanter-type centrifugal separator according to claim 1, characterized in that the remaining 80 (%) is supplied to a decanter-type centrifugal separator. 3. Consists of a rotating cylinder consisting of a conical part and a cylindrical part, an inner cylinder arranged concentrically within the rotating cylinder and driven with a rotational speed differential with the rotating cylinder, and a screw blade fixed to the inner cylinder. It is equipped with a screw conveyor and a sludge supply pipe arranged in the center of the inner cylinder, and the concentrated sludge is discharged from the outlet at the end of the conical part of the rotating cylinder, and the separated liquid is discharged from the dam at the end of the cylindrical part of the rotating cylinder. In a decanter-type centrifugal separator configured to discharge sludge, a first flocculant supply pipe is arranged in parallel with the sludge supply pipe and is configured to supply a flocculant to an inner region of the cylindrical part adjacent to the rotary cylindrical conical part; A sludge dewatering device characterized in that a second flocculant supply pipe is provided for supplying a flocculant to the inner region of the cylindrical conical part. 4. The inside of the rotating cylinder is divided from the cylindrical part side to the conical part side into a sludge supply part, a flocculant supply part for separation and concentration, and a flocculant supply part for dewatering, and the supply from the sludge supply pipe The sludge is supplied to the inner region of the rotary cylinder cylindrical part via a sludge supply part and a sludge discharge nozzle provided in the inner cylinder, and
The flocculant supplied from the flocculant supply pipe is supplied to the inner region of the cylindrical part adjacent to the rotating cylinder conical part through the flocculant supply part for separation and concentration and the flocculant discharge nozzle for separation and concentration provided in the inner cylinder. Further, the flocculant supplied from the second flocculant supply pipe is supplied to the inner region of the rotating cylinder conical part via the dehydration flocculant supply section and the dehydration flocculant discharge nozzle provided in the inner cylinder. 4. The sludge dewatering apparatus according to claim 3, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63012734A JP2540180B2 (en) | 1988-01-25 | 1988-01-25 | Sludge dewatering method and apparatus using decanter type centrifuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63012734A JP2540180B2 (en) | 1988-01-25 | 1988-01-25 | Sludge dewatering method and apparatus using decanter type centrifuge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01189358A true JPH01189358A (en) | 1989-07-28 |
| JP2540180B2 JP2540180B2 (en) | 1996-10-02 |
Family
ID=11813666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63012734A Expired - Fee Related JP2540180B2 (en) | 1988-01-25 | 1988-01-25 | Sludge dewatering method and apparatus using decanter type centrifuge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2540180B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0966299A (en) * | 1995-08-31 | 1997-03-11 | Mitsubishi Heavy Ind Ltd | Two-stage chemical injection type centrifugal dehydrator |
| JPH09323097A (en) * | 1996-06-07 | 1997-12-16 | Mitsubishi Heavy Ind Ltd | Sludge treating equipment |
| KR20020024146A (en) * | 2002-01-25 | 2002-03-29 | 이한욱 | centrifugal separator pouring into a chemical |
| US20110105292A1 (en) * | 2008-06-06 | 2011-05-05 | M-I L.L.C. | Dual feed centrifuge |
| JP2012011300A (en) * | 2010-06-30 | 2012-01-19 | Nishihara Environment Co Ltd | Centrifugal separation apparatus and sludge treatment method |
| JP2019118853A (en) * | 2017-12-28 | 2019-07-22 | 水ｉｎｇ株式会社 | Method for dewatering organic sludge, treatment apparatus used for dewatering organic sludge, and organic coagulant |
-
1988
- 1988-01-25 JP JP63012734A patent/JP2540180B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0966299A (en) * | 1995-08-31 | 1997-03-11 | Mitsubishi Heavy Ind Ltd | Two-stage chemical injection type centrifugal dehydrator |
| JPH09323097A (en) * | 1996-06-07 | 1997-12-16 | Mitsubishi Heavy Ind Ltd | Sludge treating equipment |
| KR20020024146A (en) * | 2002-01-25 | 2002-03-29 | 이한욱 | centrifugal separator pouring into a chemical |
| US20110105292A1 (en) * | 2008-06-06 | 2011-05-05 | M-I L.L.C. | Dual feed centrifuge |
| US8961381B2 (en) * | 2008-06-06 | 2015-02-24 | M-I L.L.C. | Dual feed centrifuge |
| JP2012011300A (en) * | 2010-06-30 | 2012-01-19 | Nishihara Environment Co Ltd | Centrifugal separation apparatus and sludge treatment method |
| JP2019118853A (en) * | 2017-12-28 | 2019-07-22 | 水ｉｎｇ株式会社 | Method for dewatering organic sludge, treatment apparatus used for dewatering organic sludge, and organic coagulant |
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| Publication number | Publication date |
|---|---|
| JP2540180B2 (en) | 1996-10-02 |
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