JPS5824400A - Utilizing method for dehydrated and separated water from sludge - Google Patents
Utilizing method for dehydrated and separated water from sludgeInfo
- Publication number
- JPS5824400A JPS5824400A JP56122021A JP12202181A JPS5824400A JP S5824400 A JPS5824400 A JP S5824400A JP 56122021 A JP56122021 A JP 56122021A JP 12202181 A JP12202181 A JP 12202181A JP S5824400 A JPS5824400 A JP S5824400A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- water
- polymer
- separated water
- 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 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 17
- 229920000642 polymer Polymers 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 5
- 230000018044 dehydration Effects 0.000 claims description 7
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000008394 flocculating agent Substances 0.000 abstract 4
- 239000000203 mixture Substances 0.000 abstract 3
- 239000002689 soil Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 3
- 239000010800 human waste Substances 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229920006317 cationic polymer Polymers 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001137251 Corvidae Species 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920005594 polymer fiber Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は上下水、し尿、各種産業廃水の処理工程におい
て発生した汚泥に有−機高分子凝集剤（以下ポリマとい
う）を添加して脱水した場合に得られた分離水中の残留
ポリマを除去する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the separation method obtained when an organic polymer flocculant (hereinafter referred to as polymer) is added to dehydrate sludge generated in the treatment process of water, sewage, human waste, and various industrial wastewater. The present invention relates to a method for removing residual polymer in water.
従来、水処理において発生する汚泥を脱水する方法とし
ては、この汚泥に消石灰単独もしくは塩化第二鉄と消石
灰とを添加して汚泥の濾過特性を高め、真空脱水あるい
は加圧脱水により脱水するのが普通であった。Conventionally, methods for dewatering sludge generated in water treatment include adding slaked lime alone or ferric chloride and slaked lime to the sludge to improve the filtration properties of the sludge, and then dewatering by vacuum dehydration or pressure dehydration. It was normal.
しかし、最近ではこれらの無機脱水剤に代えてポリマを
使用する研究が盛ん１ｃなり、水処理における凝集剤と
してその効果が非常にすぐれているために工業用水処理
や廃水、下水処理において利用されてはいたが、ポリマ
を水処理において発生する汚泥の脱水処理に大量に利用
した場合、脱水工程で得られた分離水には多量のポリマ
が残留するので、これを回収再利用しないのは大変不合
理であり、不経ｆＩ！Ｉであるし、残留ポリマの回収再
利用方法が確立Ａば、脱水に使用するポリマの注入率の
節約が図られ、省資源的方法となるのは言う迄もない。However, recently there has been a lot of research into using polymers instead of these inorganic dehydrating agents, and because they are extremely effective as coagulants in water treatment, they are being used in industrial water treatment, wastewater, and sewage treatment. However, when a large amount of polymer is used to dewater sludge generated during water treatment, a large amount of polymer remains in the separated water obtained in the dewatering process, so it is very inconvenient not to collect and reuse this. It is rational and unreliable! It goes without saying that if a method for recovering and reusing the residual polymer is established, the injection rate of the polymer used for dehydration can be saved, and it will be a resource-saving method.
ところでこの残留ポリマの回収再利用方法の基本となる
考え方は、特公昭５３−３２１９１号公報により公知で
ある。しかしこの考え方は確かに残留ポリマの回収再利
用方法の基本となるものであるが、主目的はあくまで残
留ポリマを除去する方法であり、残留ポリマを積極的に
脱水工程で再利用する方法を提示するものではなかった
。実際、特公昭５３−３２１９１号公報記載の方法で残
留ポリマの回収再利用実験を行なうと、脱水時に新たに
加えるポリマの量が２０〜３０％減少する場合としない
場合、さらには逆に増加する場合がみられ、注入量の節
約効果は極めて不安定であった。By the way, the basic concept of this residual polymer recovery and reuse method is known from Japanese Patent Publication No. 32191/1983. However, although this idea is certainly the basis of a method for recovering and reusing residual polymer, the main purpose is only to remove residual polymer, and we present a method to actively reuse residual polymer in the dehydration process. It wasn't something to do. In fact, when conducting an experiment to recover and reuse residual polymer using the method described in Japanese Patent Publication No. 53-32191, the amount of newly added polymer during dehydration was found to decrease by 20 to 30%, sometimes not, and even increase. In some cases, the saving effect on injection volume was extremely unstable.
本発明は以上の欠点を解決し、残留ポリマを積極的に回
収再利用し、その効果を最大限発揮しうる方法を提供す
ることを目的とする。It is an object of the present invention to provide a method for solving the above-mentioned drawbacks, actively collecting and reusing residual polymer, and maximizing its effects.
すなわち本発明は一１水処理において発生した汚泥に高
分子凝集剤を添加して脱水した際に得られた高分子績−
剤を含む分離水を混合し、この汚泥中の懸濁固形物に前
記分離水中の高分子凝集剤を吸着させて固液分離し、得
られた濃縮汚泥に高分子凝集剤を添加して脱水する方法
において、分離水の滞留時間と汚泥の滞留時間をそれぞ
れ７日以内、４日以内とすることを特徴とするものであ
る。That is, the present invention is directed to 11.11.11 A polymer fiber obtained by adding a polymer flocculant to dewatering sludge generated during water treatment.
The polymer flocculant in the separated water is adsorbed to the suspended solids in the sludge to perform solid-liquid separation, and the resulting thickened sludge is dehydrated by adding the polymer flocculant to the resulting thickened sludge. The method is characterized in that the residence time of the separated water and the residence time of the sludge are within 7 days and within 4 days, respectively.
本発明の一実施態様をし尿処理場から発生する活性汚泥
を例にとって図面を参照しつつ説明すれば、第１図にお
いてまず曝気槽Ａに投入されたし尿ｌはここで活性汚泥
処理されて、流出する混合液２は沈殿池Ｂに流入し、こ
こで清澄水３と汚泥４とに分離される。清澄水はこの後
塩素滅菌を経て放流される。一方汚泥４は大部分は返送
汚泥５として曝気槽Ａに返送され、一部が余剰汚泥とし
て引抜かれる。引抜かれた余剰汚泥は混合槽Ｃで脱水機
Ｔにおける分離水１１と混合され６、濃縮槽りへ導かれ
る。ここで分離水１１中の残留ポリマを吸着した汚泥中
の１ｆｆｉ形物は沈降し、濃縮汚泥８となる。残留ポリ
マを吸着した濃縮汚泥８は汚泥貯＋６１ Ｅを経て、脱
水機Ｆで新しいポリマ１０を添加され、脱水ケーキ１２
として回収される。また、脱水機Ｆで得られた分離水１
１にはポリマが残留しているので、前記のように混合槽
Ｃに送られる。One embodiment of the present invention will be described with reference to the drawings, taking activated sludge generated from a human waste treatment plant as an example. In FIG. The mixed liquid 2 flowing out flows into the settling tank B, where it is separated into clear water 3 and sludge 4. The clear water is then chlorine sterilized before being released. On the other hand, most of the sludge 4 is returned to the aeration tank A as return sludge 5, and a portion is withdrawn as surplus sludge. The extracted excess sludge is mixed with the separated water 11 in the dehydrator T in a mixing tank C, and is led to the thickening tank. Here, the 1ffi-shaped substances in the sludge that have adsorbed the residual polymer in the separated water 11 settle and become thickened sludge 8. The concentrated sludge 8 that has adsorbed the residual polymer passes through the sludge storage +61 E, where new polymer 10 is added in the dehydrator F, and the dehydrated cake 12
will be collected as. In addition, separated water 1 obtained from dehydrator F
Since polymer remains in No. 1, it is sent to mixing tank C as described above.
本発明のように、ポリマの回１１７再利用に目的をおく
場合には、分離水と汚泥の滞留時間を規定することが極
めて重要である。すなわち、分離水の滞留時間（汚泥と
接触までの）は、第２図に示されるように、滞留時間が
長くなると、ポリマ注入率の低減効果が減少し、１０日
をこえると０となる。従って、ポリマ注入率の低減効果
を得るには、まず分離水の滞留時間を１０日以内とし、
有効な残留ポリマを含む分離水とすることが必要である
。When the purpose is to recycle the polymer as in the present invention, it is extremely important to specify the residence time of separated water and sludge. That is, as shown in FIG. 2, as the residence time of separated water (until contact with sludge) becomes longer, the effect of reducing the polymer injection rate decreases, and becomes 0 after 10 days. Therefore, in order to obtain the effect of reducing the polymer injection rate, first, the residence time of separated water should be set within 10 days,
It is necessary that the separated water contains effective residual polymer.
次に、有効な残留ポリマを含む分離水であっても、汚泥
の滞留時間（分離水と接触してから脱水する迄）を長く
すると略Ａ弘ように、注入率低減効果が減少し、５日で
０となり、それをこえる滞留時間では逆効果）る。従っ
て汚泥の滞留時間は５日以内とすることが必要である。Next, even if the separated water contains effective residual polymer, if the retention time of the sludge (from contact with the separated water to dehydration) is increased, the injection rate reduction effect will decrease, as shown in the figure. It becomes 0 in 1 day, and if the residence time exceeds that, it will have the opposite effect). Therefore, the residence time of sludge must be within 5 days.
すなわち、分離水と汚泥の滞留時間が上述の条件を満足
した時にポリマ注入率の低減効果は存在するのであって
、この条件からはずれた場合には効果がないか逆効果に
なる。That is, the effect of reducing the polymer injection rate exists when the residence time of separated water and sludge satisfies the above-mentioned conditions, and if it deviates from this condition, there is no effect or the opposite effect occurs.
以上述べたように、本発明で示した分離水と汚泥の滞留
時間をそれぞれ７日以内、４日以内に保てば、脱水時に
新たに加えるポリマの量は確実に５〜３０％減少させる
ことができ、確実な経済効果が期待される。As mentioned above, if the retention times of separated water and sludge are kept within 7 days and 4 days, respectively, as shown in the present invention, the amount of newly added polymer during dewatering can be definitely reduced by 5 to 30%. , and certain economic effects are expected.
次に実施例を示す。Next, examples will be shown.
実施例 ｌ
生し尿を脱窒素処理する一プロセスから発生した余剰汚
泥（濃度０．８％）を１日濃縮すると濃度は２、３９６
となった。この濃縮汚泥をベルトプレスで脱水テストし
たところ、カチオンポリマの注入率は固形物当り１．１
％となり、ケーキ水分は８０ｑ６となった。Example 1 When surplus sludge (concentration 0.8%) generated from a process of denitrifying human waste is concentrated for one day, the concentration becomes 2,396.
It became. When this thickened sludge was dehydrated using a belt press, the injection rate of cationic polymer was 1.1 per solid.
%, and the cake moisture was 80q6.
次に上記テストで得られた脱水分離水に同容品：の子剰
汚泥を混合攪拌し、１日濃縮すると濃度は２．５％とな
った。この濃縮汚泥を同じベルトプレスで脱水テストし
たところ、カチオンポリマの注入率は固形物当り０．８
％まで減少し、注入率の低減効果は２７ｑ６となった。Next, the dehydrated and separated water obtained in the above test was mixed and stirred with the same product, the residual sludge, and concentrated for one day, resulting in a concentration of 2.5%. When this thickened sludge was dehydrated using the same belt press, the injection rate of cationic polymer was 0.8 per solid.
%, and the injection rate reduction effect was 27q6.
またケーキ含水率は７９％であった。Moreover, the moisture content of the cake was 79%.
第１図は本発明の一実施態様を示す系統説明図で、第２
図は４；ｙｓｉの滞留時間と注入率低減効用の関係、第
３図は汚泥の１留時間と注入率低減効果の関係を示す。
１・・・・・・生し尿、２・・・・・・活性汚泥、３・
・・・・・放流水、４・・・・・沈殿池引抜汚泥、５・
・・・・・返送汚泥、６・・・・・・分離液混合汚泥、
７・・・・・・濃縮槽上澄水、８．９・・・・・・濃縮
汚泥、
１０・・・・・・ポリマ、１１・・・・・・分離水、１
２・・・・・・脱水ケーキ、
Ａ・・・・・曝気槽、Ｂ・・・・・・沈殿池、Ｃ・・・
・・・混合槽、Ｄ・・・濃鮪槽、Ｅ・・・・・・貯留槽
、Ｆ・・・・・・脱水機第 ２−図
ｅ鎚永め４留吟藺（Ｊａｙｓ）
第 ３ 図
０ ５
／ａ賜扼の４ｇ綺ＰＪ （Ｊａｙ５１FIG. 1 is a system explanatory diagram showing one embodiment of the present invention, and the second
Figure 4 shows the relationship between the residence time of ysi and the effect of reducing the injection rate, and Figure 3 shows the relationship between the residence time of sludge and the effect of reducing the injection rate. 1... Fresh urine, 2... Activated sludge, 3.
... Effluent water, 4. ... Sludge drawn from settling tank, 5.
... Returned sludge, 6 ... Separated liquid mixed sludge,
7... Thickening tank supernatant water, 8.9... Thickened sludge, 10... Polymer, 11... Separated water, 1
2... Dehydrated cake, A... Aeration tank, B... Sedimentation tank, C...
...Mixing tank, D...Dense tuna tank, E...Storage tank, F...Dehydrator No. 2-Fig. e Jays No. 4 Figure 0 5
/a Gift of 4g Ki PJ (Jay51
Claims (1)
加して脱水した際に得られだ該高分子凝集剤を含む分離
水を混合し、該分離水中の高分子凝集剤を汚泥中の固形
物に吸着させて固液分離して得られた濃縮汚泥に前記高
分子凝集剤を添加して脱水する方法において、前記分離
水が前記汚泥に混合されるまでの滞留時間を１０日以内
とし、゛該分離水が混合された汚泥を混合後５日以内に
脱水することを特徴とする汚泥脱水分離水の利用法。Separated water containing the polymer flocculant obtained by adding a molecular thresholding agent to the sludge generated during water treatment and dehydration is mixed, and the polymer flocculant in the separated water is mixed into the sludge. In the method of adding the polymer flocculant to the thickened sludge obtained by solid-liquid separation by adsorbing it on a solid substance to dehydrate it, the residence time until the separated water is mixed with the sludge is within 10 days. and ``a method for utilizing sludge dewatered separated water, characterized in that the sludge mixed with the separated water is dehydrated within 5 days after mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56122021A JPS5824400A (en) | 1981-08-04 | 1981-08-04 | Utilizing method for dehydrated and separated water from sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56122021A JPS5824400A (en) | 1981-08-04 | 1981-08-04 | Utilizing method for dehydrated and separated water from sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5824400A true JPS5824400A (en) | 1983-02-14 |
| JPS6345279B2 JPS6345279B2 (en) | 1988-09-08 |
Family
ID=14825615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56122021A Granted JPS5824400A (en) | 1981-08-04 | 1981-08-04 | Utilizing method for dehydrated and separated water from sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5824400A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0648046Y2 (en) * | 1989-06-12 | 1994-12-07 | 株式会社メデカス工販 | Unit for piping |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4870361A (en) * | 1971-12-27 | 1973-09-22 |
-
1981
- 1981-08-04 JP JP56122021A patent/JPS5824400A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4870361A (en) * | 1971-12-27 | 1973-09-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6345279B2 (en) | 1988-09-08 |
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