JPS6345601B2 - - Google Patents
Info
- Publication number
- JPS6345601B2 JPS6345601B2 JP58167540A JP16754083A JPS6345601B2 JP S6345601 B2 JPS6345601 B2 JP S6345601B2 JP 58167540 A JP58167540 A JP 58167540A JP 16754083 A JP16754083 A JP 16754083A JP S6345601 B2 JPS6345601 B2 JP S6345601B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- screen
- separated
- liquid
- suspension
- 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
Links
- 239000010802 sludge Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 22
- 239000000725 suspension Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 238000011282 treatment Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- -1 but the chromaticity Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Landscapes
- Filtration Of Liquid (AREA)
Description
【発明の詳細な説明】
本発明は、懸濁液中の懸濁固形分を高濃度の濃
縮汚泥として分離する固液分離方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-liquid separation method for separating suspended solids in a suspension into highly concentrated concentrated sludge.
従来、懸濁液中の懸濁固形分を分離する方法の
一つとして、スクリーンを利用するものが多くな
つてきている。この方法は、高分子凝集剤によつ
て形成された凝集フロツクを、傾斜ウエツジワイ
ヤスクリーン、回転スクリーンその他のスクリー
ンによつて分離するという方法であつて、固液分
離時間がきわめて短かいこと、また分離された汚
泥濃度が、従来の凝集沈殿よりも高くなり、爾後
の脱水その他の汚泥処理を有利にするという利点
がある。 Conventionally, screens have been increasingly used as one of the methods for separating suspended solids in suspensions. This method separates flocs formed by a polymer flocculant using an inclined wedge wire screen, rotating screen, or other screen, and the solid-liquid separation time is extremely short. In addition, the separated sludge concentration is higher than in conventional coagulation and sedimentation, which has the advantage of making subsequent dewatering and other sludge treatments advantageous.
しかしながら、スクリーンで液中の凝集フロツ
クを完全に分離することは不可能であり、スクリ
ーンを通過する分離液中にかなりの量の固形分が
残つているという問題点があつた。また、スクリ
ーンで分離された分離液中の固形分をさらに分離
するために沈殿処理を行つても、沈殿汚泥濃度は
スクリーンで分離された汚泥の半分にも達せず、
これら両汚泥を脱水する場合に、スクリーンで折
角高濃度に濃縮された汚泥が低濃度の沈殿汚泥に
よつて希釈されてしまい、脱水その他の汚泥処理
を不利にするという問題点もあつた。 However, there was a problem in that it was impossible to completely separate the flocs in the liquid with the screen, and a considerable amount of solids remained in the separated liquid that passed through the screen. In addition, even if precipitation treatment is performed to further separate the solid content in the separated liquid separated by the screen, the concentration of the settled sludge does not reach even half of the sludge separated by the screen.
When dewatering both of these sludges, there was a problem in that the sludge that had been concentrated to a high concentration in the screen was diluted by the low concentration settled sludge, making dewatering and other sludge treatments disadvantageous.
本発明は、これら従来の問題点を解決し、常に
安定して高濃度の濃縮汚泥を得ることができ、汚
泥処理をも有利たらしめる固液分離方法を提供す
ることを目的とするものである。 The present invention aims to solve these conventional problems and provide a solid-liquid separation method that can always stably obtain highly concentrated concentrated sludge and that also makes sludge treatment advantageous. .
本発明は、懸濁液に少なくとも高分子凝集剤を
添加して凝集フロツクを形成せしめたのち、該凝
集フロツクをスクリーンによつて濃縮分離し、ス
クリーンを透過した分離液を沈降分離し、得られ
た沈殿汚泥を前記懸濁液に混合することを特徴と
するものである。 In the present invention, at least a polymer flocculant is added to a suspension to form flocs, the flocs are concentrated and separated using a screen, and the separated liquid that has passed through the screen is separated by sedimentation. The method is characterized in that the precipitated sludge is mixed into the suspension.
本発明の一実施態様を図面を参照しながら説明
すれば、懸濁固形分を含む懸濁液１に少なくとも
高分子凝集剤２を添加するが、液中の色度、リ
ン、CODなどを同時に除去しようとするときは
鉄塩、アルミニウム塩などの無機凝集剤を併用す
る。この少なくとも高分子凝集剤２が添加された
懸濁液１を、フロツク形成槽３に導き、撹拌混和
して粗大な凝集フロツクを形成させて凝集スラリ
ー４とし、分配槽５を経て約60度に傾斜している
傾斜ウエツジワイヤスクリーン６を流下させ、濃
縮汚泥７とスクリーン６を透過する分離液８に分
離する。このスクリーン６で分離された濃縮汚泥
７は、例えば余剰活性汚泥の場合は固形物濃度４
〜4.5％という高濃度に濃縮され貯槽９に至る。 To explain one embodiment of the present invention with reference to the drawings, at least a polymer flocculant 2 is added to a suspension 1 containing suspended solids, but the chromaticity, phosphorus, COD, etc. in the liquid are simultaneously When attempting to remove it, use an inorganic flocculant such as iron salt or aluminum salt. This suspension 1 to which at least the polymer flocculant 2 has been added is led to a floc formation tank 3, stirred and mixed to form coarse flocs to form a flocculated slurry 4, and passed through a distribution tank 5 to a temperature of about 60 degrees. The sludge is allowed to flow down an inclined wedge wire screen 6 and is separated into a thickened sludge 7 and a separated liquid 8 that passes through the screen 6. For example, in the case of surplus activated sludge, the concentrated sludge 7 separated by this screen 6 has a solid content of 4
It is concentrated to a high concentration of ~4.5% and reaches the storage tank 9.
前記スクリーン６を透過した分離液８には、ス
クリーン６では完全に分離しきれなかつた固形分
が混入しており、そのまま放流することができな
い。したがつて、この分離液８を沈殿槽１０に導
いて固形物濃度１〜1.5％程度の沈殿汚泥１１と
上澄液１２とに沈殿分離し、上澄液１２を放流す
ることができる。 The separated liquid 8 that has passed through the screen 6 contains solids that could not be completely separated by the screen 6, and cannot be discharged as is. Therefore, this separated liquid 8 can be led to a settling tank 10 and separated into precipitated sludge 11 having a solids concentration of about 1 to 1.5% and a supernatant liquid 12, and the supernatant liquid 12 can be discharged.
また、沈殿槽１０で分離された沈殿汚泥１１を
リサイクルし、原懸濁液１に混合して再び前記の
ようにしてスクリーン６で固液分離する。ここで
注意すべきは、沈殿汚泥１１をスクリーン６で分
離された濃縮汚泥７の貯槽９に導入しないことで
あり、もし貯槽９に導入すれば、折角スクリーン
６によつて高濃度に濃縮された濃縮汚泥７の濃度
が低濃度の沈殿汚泥１１によつて希釈されるとい
う好ましからざる結果をもたらす。 Further, the settled sludge 11 separated in the settling tank 10 is recycled, mixed with the original suspension 1, and solid-liquid separated again in the screen 6 as described above. What should be noted here is not to introduce the settled sludge 11 into the storage tank 9 of the concentrated sludge 7 separated by the screen 6; if it is introduced into the storage tank 9, it will be concentrated to a high concentration by the screen 6. An undesirable result is that the concentration of the thickened sludge 7 is diluted by the settled sludge 11 having a low concentration.
このようにして、高濃度のスクリーン分離濃縮
汚泥７のみを、例えば脱水工程１３に供給するこ
とになり、汚泥脱水工程の処理能力は向上され、
生ずる脱水液の量は減少する。 In this way, only the screen-separated thickened sludge 7 with high concentration is supplied to, for example, the dewatering process 13, and the processing capacity of the sludge dewatering process is improved.
The amount of dehydrated liquid produced is reduced.
以上述べたように、本発明は懸濁液中に粗大な
凝集フロツクを形成し、この凝集フロツクをスク
リーンによつて高濃度の濃縮汚泥として分離し、
スクリーンを透過した分離液を沈殿分離してその
沈殿汚泥を原懸濁液にリサイクルするものである
から、次のような効果を得ることができるもので
ある。 As described above, the present invention forms coarse flocs in a suspension, separates the flocs as highly concentrated concentrated sludge using a screen, and
Since the separated liquid that has passed through the screen is subjected to precipitation separation and the precipitated sludge is recycled to the original suspension, the following effects can be obtained.
スクリーン分離と沈殿分離の２段直列分離法
により、スクリーンにおける固形分回収率が悪
化した場合でも、安定して清澄な処理液を得る
ことができる。 By using the two-stage series separation method of screen separation and precipitation separation, a clear treated liquid can be stably obtained even when the solid content recovery rate in the screen deteriorates.
沈殿汚泥を原懸濁液にリサイクルし、脱水工
程などに供給する汚泥を高濃度のスクリーン濃
縮汚泥のみにしたから、脱水工程などの処理能
力が向上する。 Since the settled sludge is recycled to the raw suspension and only high-concentration screen thickened sludge is supplied to the dewatering process, the processing capacity of the dewatering process is improved.
沈殿汚泥を原懸濁液にリサイクルすることに
よつて、沈殿汚泥自体が凝集助剤としての効果
を発揮する。 By recycling the settled sludge into the original suspension, the settled sludge itself exerts its effect as a coagulation aid.
次に本発明の実施例を示す。 Next, examples of the present invention will be shown.
し尿を無希釈で生物学的硝化脱窒素処理した生
物処理水にFeCl3を1500mg／添加したのちCa
（OH）2でPH４〜５に中和し、さらにノニオン系
高分子凝集剤を10mg／添加し、混合して凝集ス
ラリとし、これを60゜傾斜ウエツジワイヤスクリ
ーン（目開き0.5mm）上に流下させたところ、分
離時間１〜３秒で固形物濃度４〜4.8％の濃度汚
泥を得たが、スクリーンを透過した分離水の固形
分は500〜1000mg／と多かつた。この分離水を
沈殿槽において沈降分離速度20mm／minで固液分
離したところ、固形物濃度１〜1.5％の沈殿汚泥
を得た。 After adding 1500 mg of FeCl 3 to biologically treated water obtained by biologically nitrifying and denitrifying human waste without diluting it, Ca
Neutralize to pH 4-5 with (OH) 2 , add 10 mg of nonionic polymer flocculant, mix to form a flocculation slurry, and transfer this onto a 60° inclined wedge wire screen (openings: 0.5 mm). When the sludge was allowed to flow down, a sludge with a solid content of 4 to 4.8% was obtained in a separation time of 1 to 3 seconds, but the solid content of the separated water that passed through the screen was as high as 500 to 1000 mg/. This separated water was subjected to solid-liquid separation in a sedimentation tank at a sedimentation rate of 20 mm/min to obtain precipitated sludge with a solid concentration of 1 to 1.5%.
この沈殿汚泥を上記の生物処理水にリサイクル
して再び上記のスクリーン分離を行つたところ、
スクリーン分離効果の悪化は認められず、逆にノ
ニオン系高分子凝集剤の添加量を７mg／に減少
させることができた。 When this settled sludge was recycled into the above biologically treated water and subjected to the above screen separation again,
No deterioration of the screen separation effect was observed, and on the contrary, the amount of nonionic polymer flocculant added could be reduced to 7 mg/.
また、スクリーン分離により得られた高濃度の
濃縮汚泥をフイルタプレス脱水機で脱水したが、
過速度は2.8〜3.0KgDS／m2・hrという高い値
で、得られた脱水ケーキの含水率は65〜67％であ
つた。 In addition, the highly concentrated concentrated sludge obtained by screen separation was dehydrated using a filter press dehydrator.
The overrate was as high as 2.8 to 3.0 KgDS/m 2 ·hr, and the moisture content of the resulting dehydrated cake was 65 to 67%.
図面は本発明の一実施態様を示す系統説明図で
ある。
１……懸濁液、２……高分子凝集剤、３……フ
ロツク形成槽、４……凝集スラリー、５……分配
槽、６……傾斜ウエツジワイヤスクリーン、７…
…濃縮汚泥、８……分離液、９……貯槽、１０…
…沈殿槽、１１……沈殿汚泥、１２……上澄液、
１３……脱水工程。
The drawing is a system explanatory diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Suspension, 2...Polymer flocculant, 3...Floc formation tank, 4...Flocculated slurry, 5...Distribution tank, 6...Slanted wedge wire screen, 7...
...Thickened sludge, 8...Separated liquid, 9...Storage tank, 10...
... Sedimentation tank, 11 ... Sedimented sludge, 12 ... Supernatant liquid,
13...Dehydration process.
Claims (1)
凝集フロツクを形成せしめたのち、該凝集フロツ
クをスクリーンによつて濃縮分離し、スクリーン
を透過した分離液を沈降分離し、得られた沈殿汚
泥を前記懸濁液に混合することを特徴とする固液
分離方法。1. After adding at least a polymer flocculant to the suspension to form a flocculated floc, the flocculated floc is concentrated and separated using a screen, and the separated liquid that has passed through the screen is separated by sedimentation, resulting in precipitated sludge. A solid-liquid separation method characterized by mixing into the suspension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58167540A JPS6061013A (en) | 1983-09-13 | 1983-09-13 | Solid/liquid separating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58167540A JPS6061013A (en) | 1983-09-13 | 1983-09-13 | Solid/liquid separating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6061013A JPS6061013A (en) | 1985-04-08 |
| JPS6345601B2 true JPS6345601B2 (en) | 1988-09-09 |
Family
ID=15851592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58167540A Granted JPS6061013A (en) | 1983-09-13 | 1983-09-13 | Solid/liquid separating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6061013A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284210B (en) * | 2011-05-31 | 2014-07-23 | 神华集团有限责任公司 | Method for separating and filtering molecular sieve crystallization slurry |
| CN108862700A (en) * | 2018-06-15 | 2018-11-23 | 宁波暄妍日化科技有限公司 | A kind of efficient flocks processing unit of sewage treatment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715898A (en) * | 1980-07-01 | 1982-01-27 | Ebara Infilco Co Ltd | Treatment of organic waste liquid |
-
1983
- 1983-09-13 JP JP58167540A patent/JPS6061013A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715898A (en) * | 1980-07-01 | 1982-01-27 | Ebara Infilco Co Ltd | Treatment of organic waste liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6061013A (en) | 1985-04-08 |
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