JPH0985013A - Dehydration of sludge - Google Patents
Dehydration of sludgeInfo
- Publication number
- JPH0985013A JPH0985013A JP7264697A JP26469795A JPH0985013A JP H0985013 A JPH0985013 A JP H0985013A JP 7264697 A JP7264697 A JP 7264697A JP 26469795 A JP26469795 A JP 26469795A JP H0985013 A JPH0985013 A JP H0985013A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- polymer
- formula
- mol
- structural unit
- 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.)
- Pending
Links
Landscapes
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は新規な汚泥脱水方法に関
するものであり、特別な種類の高分子凝集剤を、特別な
添加方法で添加する事により、高効率の脱水を行い低含
水率の脱水ケーキを得る事を目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel sludge dewatering method, in which a high-efficiency dewatering is performed by adding a special type of polymer flocculant by a special addition method. The purpose is to obtain a dehydrated cake.
【０００２】[0002]
【従来の技術】これまでに各種の汚泥脱水方法が提案さ
れている。 ベルトプレスは一般的な汚泥脱水機であ
り、エンドレスの濾布を走行させながら、重合系高分子
凝集剤により凝集した汚泥を、先ず重力脱水ゾーンと称
される部分で汚泥フロック間に存在する自由水の自重に
よる水切りを行い、含水率の低下した状態で必要により
各種の操作を施した後に、加圧脱水ゾーンまたはプレス
ゾーンと称される部分で、もう一枚のエンドレスベルト
が汚泥に接し、ロールにより圧搾脱水を行う構造をつね
とする。 重力脱水ゾーンとプレスゾーンとの中間で行
う操作を例示すれば、機械的に剪断力を与えてフロック
径を小さくする事、塩化第二鉄やＰＡＣ等の無機凝結剤
あるいはカチオン性縮合系高分子の水溶液をシャワーリ
ングしてフロック間隙にカチオン性凝結剤を満たす事に
より、離漿作用を生ぜしめ含水率の低減を計る事、上記
薬品を添加後に機械攪拌による混合操作を行う事等が知
られている。2. Description of the Related Art Various sludge dewatering methods have been proposed so far. A belt press is a general sludge dewatering machine, and while running an endless filter cloth, sludge aggregated by a polymer macromolecule flocculant is first placed between sludge flocs in a part called a gravity dehydration zone. After draining due to its own weight of water, after performing various operations as necessary in a state where the water content is reduced, another endless belt contacts the sludge in a portion called a pressure dehydration zone or a press zone, The structure that performs compression dehydration with rolls is always used. As an example of the operation performed between the gravity dehydration zone and the press zone, mechanically applying a shearing force to reduce the floc diameter, an inorganic coagulant such as ferric chloride or PAC, or a cationic condensation polymer It is known that by showering the aqueous solution of the above solution to fill the floc gap with a cationic coagulant, a synergic action is caused to reduce the water content, and after the above chemicals are added, a mixing operation by mechanical stirring is performed. ing.
【０００３】[0003]
【発明の課題】しかしながら、これまで公知の方法では
コスト上の問題、メンテナンス上の問題、性能効果上の
問題等が有り、新規な方法が求められてきた。 例えば
塩化第二鉄やＰＡＣの様な無機凝結剤を使用すると、汚
泥ＰＨが酸性となる事によって装置の腐食が発生した
り、焼却炉において塩化水素ガスが発生し炉の損傷が起
こったり排ガス対策が必要に成る等の害作用が発生す
る。 有機カチオン性縮合系高分子を添加混合する方法
は、汚泥フロックが十分な強度を持つようにする為には
多量の添加を必要とし、コスト的に耐えがたい金額と成
る。 重力脱水後の汚泥に通常の重合系高分子凝集剤を
添加した場合は分散性が悪く、フロックがべたつくだけ
で、汚泥の原粒子と接触する事により包含している水を
離漿して脱水ケーキの含水率を低下させるという能力が
無い。 本願発明は装置の損傷無く、効率的安価に脱水
ケーキの含水率を低下させる事を課題とする。However, the known methods have hitherto been problematic in terms of cost, maintenance, performance and the like, and a new method has been demanded. For example, when an inorganic coagulant such as ferric chloride or PAC is used, the sludge PH becomes acidic, which causes corrosion of the equipment, hydrogen chloride gas is generated in the incinerator, and the furnace is damaged, and exhaust gas countermeasures are taken. Will be necessary and other harmful effects will occur. The method of adding and mixing the organic cationic condensation-type polymer requires a large amount of addition in order to make the sludge flocs have sufficient strength, and the cost is unbearable. The dispersibility is poor when a normal polymerization type polymer flocculant is added to the sludge after gravity dehydration, and only flocs become sticky, and the water contained in the sludge is synergic and dehydrated by contact with the original particles of the sludge. There is no ability to reduce the water content of the cake. An object of the present invention is to reduce the water content of a dehydrated cake efficiently and inexpensively without damaging the device.
【０００４】[0004]
【課題を解決する為の手段】本願発明は上記課題を達成
するために次の用に構成される。請求項１の発明はベル
トプレス型汚泥脱水機において重力脱水操作を行った後
の汚泥に、下記式（１）または（２）で表される構造単
位を５モル％以上含有するカチオン性高分子凝集剤を添
加混合した後に、加圧脱水工程を経て脱水ケーキを得る
事を特徴とする汚泥脱水方法である。Means for Solving the Problems In order to achieve the above object, the present invention is constituted as follows. The invention of claim 1 is a cationic polymer containing 5 mol% or more of a structural unit represented by the following formula (1) or (2) in sludge after gravity dehydration operation in a belt press type sludge dewatering machine. The sludge dewatering method is characterized in that a dehydrated cake is obtained through a pressure dewatering step after adding and mixing a flocculant.
【化ー１】[Chemical-1]
【化−２】（式中Ｒ1 , Ｒ2 は水素原子またはメチル基
をＸ- は陰イオンを表す。） この様に特殊な高分子凝集剤を特殊な薬注方法で添加混
合する事により本願発明の著しい効果が発揮される。請
求項２の発明は式（１）または（２）で表される構造単
位を５モル％以上含有するカチオン性高分子凝集剤の、
１規定食塩水中で測定した、固有粘度が１〜５ｄｌ／ｇ
である事を特徴とする請求項１に記載の汚泥脱水方法で
ある。 固有粘度は分子量の指標であり、低分子量では
凝集効果がなく、高分子量では分散混合性が悪く汚泥フ
ロックがべたつき易くなる事から、剥離性が悪くなる。
請求項３の発明は式（１）または（２）で表される構造
単位を５モル％以上含有するカチオン性高分子凝集剤を
形成するポリマーのカチオン性コロイド当量値が３〜８
ｍｅｑ／ｇである事を特徴とする請求項１に記載の汚泥
脱水方法で有る。 カチオン性が３ｍｅｑ／ｇ以下であ
ると含水率を低下させるという能力が無く、８ｍｅｑ／
ｇ以上にする事は不経済である。請求項４の発明は式
（１）または（２）で表される構造単位を５モル％以上
含有するカチオン性高分子凝集剤を形成するポリマーが
Ｎ−ビニルホルムアミドとアクリロニトリルの共重合体
の酸加水分解加熱物である事を特徴とする請求項１に記
載の汚泥脱水方法である。 Ｎ−ビニルホルムアミドと
アクリロニトリルは交互共重合を起こしやすくＮ−ビニ
ルホルムアミド基とアクリロニトリル基は隣接して存在
し、加水分解後の環状化反応により式（１）または
（２）で表される構造単位を形成し易い。 上記構造単
位をアミジン基と称する。請求項５の発明は脱水対象と
なる汚泥が活性汚泥の余剰汚泥または活性汚泥の余剰汚
泥と沈殿汚泥の混合汚泥である事を特徴とする請求項１
に記載の汚泥脱水方法である。 余剰汚泥は汚泥原粒子
表面を親水性コロイド状保護膜が覆っている為に通常の
脱水方法ではケーキ含水率を低下させ難い性質があり本
願発明の特性を発揮させ易い。 ここに言う沈殿汚泥は
単純沈殿汚泥と凝集沈殿汚泥の区別を問わない。(Wherein R 1 and R 2 represent a hydrogen atom or a methyl group, and X − represents an anion.) Thus, by adding and mixing a special polymer flocculant by a special chemical injection method, The remarkable effect of the present invention is exhibited. The invention of claim 2 is a cationic polymer flocculant containing 5 mol% or more of the structural unit represented by the formula (1) or (2),
Intrinsic viscosity measured in 1N saline is 1-5dl / g
The sludge dewatering method according to claim 1, wherein Intrinsic viscosity is an index of molecular weight. When the molecular weight is low, there is no aggregating effect, and when the molecular weight is high, the dispersibility is poor because sludge flocs are apt to become sticky, resulting in poor releasability.
In the invention of claim 3, the cationic colloid equivalent value of the polymer forming the cationic polymer flocculant containing the structural unit represented by the formula (1) or (2) in an amount of 5 mol% or more is 3 to 8
The sludge dewatering method according to claim 1, wherein the method is meq / g. If the cationicity is 3 meq / g or less, there is no ability to reduce the water content, and 8 meq /
It is uneconomical to exceed g. In the invention of claim 4, the polymer forming the cationic polymer flocculant containing 5 mol% or more of the structural unit represented by the formula (1) or (2) is an acid of a copolymer of N-vinylformamide and acrylonitrile. The sludge dewatering method according to claim 1, wherein the sludge dehydration method is a hydrolyzed product. Alternating copolymerization of N-vinylformamide and acrylonitrile is likely to occur, the N-vinylformamide group and acrylonitrile group are present adjacent to each other, and the structural unit represented by the formula (1) or (2) is obtained by a cyclization reaction after hydrolysis. Easy to form. The above structural unit is called an amidine group. The invention of claim 5 is characterized in that the sludge to be dehydrated is an excess sludge of activated sludge or a mixed sludge of excess sludge of activated sludge and settled sludge.
The sludge dewatering method described in 1. The surplus sludge has a property that it is difficult to lower the water content of the cake by a normal dehydration method because the surface of the sludge original particles is covered with the hydrophilic colloidal protective film, and the characteristics of the present invention are easily exhibited. The sedimentation sludge referred to here does not matter whether it is simple sedimentation sludge or coagulation sedimentation sludge.
【０００５】[0005]
【実施例】次に実施例によって、本発明を具体的に説明
するが、本発明はその要旨を超えない限り、以下の実施
例に制約されるものではない。EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist.
【０００６】本願発明に用いる高分子凝集剤は特開平５
ー１９２５１３号公報に記載されたポリマーから成る高
分子凝集剤であり、Ｎ−ビニルホルムアミドとアクリロ
ニトリルを共重合させ、生成した共重合体を塩酸の存在
下に加熱して製造される。Ｎ−ビニルホルムアミドとア
クリロニトリルをそれぞれ５０モル％の共重合体を塩酸
により加熱加水分解して得られた供試ポリマーの特性を
表ー１に示す。The polymer flocculant used in the present invention is disclosed in Japanese Patent Laid-Open No.
It is a polymer flocculant composed of a polymer described in Japanese Patent Laid-Open No. 192513 and is produced by copolymerizing N-vinylformamide and acrylonitrile, and heating the resulting copolymer in the presence of hydrochloric acid. The properties of the test polymer obtained by heating and hydrolyzing 50 mol% of each copolymer of N-vinylformamide and acrylonitrile with hydrochloric acid are shown in Table 1.
【表ー１】 このポリマーを用いて脱水試験を行った実施態様の一例
を図面を用いて説明する。 図ー１は発明を使用する汚
泥脱水のフローシートの一例の説明図である。ポリマー
溶液貯槽１より薬注ポンプ等により供給されたポリマー
溶液は凝集攪拌槽３にて汚泥４と混合され汚泥フロック
を形成する。 汚泥フロックは脱水機の重力脱水部に供
給され、重力脱水により含水率が低下し、反転部より下
部濾布上に重力落下する汚泥に、ポリマー溶液貯槽２よ
り本願発明のカチオン性ポリアミジン高分子凝集剤を供
給しながら、落下の衝撃力により汚泥とポリマーの混合
攪拌を行う。 必要により動力による混合装置を付加し
てもよい。 これをポリマーの二次添加と呼ぶ。 ポリ
マーの二次添加に用いる高分子凝集剤と、汚泥の凝集攪
拌槽に添加する高分子凝集剤は同一である方が機材を共
通化できるメリットがあるが、異種凝集剤の使用を排除
するものではない。 下部濾布上に落下した重力脱水汚
泥は多数のローラーによる対向ローラー脱水を行った後
に大径のローラーにより二層の濾布の曲率を正負に変化
させてケーキにシェアリングを加えて圧密度を高め含水
率を低下させる。 排出された脱水ケーキの含水率は１
０５度Ｃの通風乾燥機により一晩加熱乾燥して恒量にな
った時点の乾燥減量を乾燥前の湿ケーキ重量で除して百
分率を求める。 今回の試験において、汚泥凝集用に凝
集攪拌槽に添加した高分子凝集剤は試料ー１を用いた
が、Ｐ−ＤＭＣ等の（メタ）アクリル系高分子凝集剤を
使用する事も本願発明の範囲である。[Table-1] An example of an embodiment in which a dehydration test was performed using this polymer will be described with reference to the drawings. FIG. 1 is an explanatory diagram of an example of a flow sheet for sludge dewatering using the invention. The polymer solution supplied from the polymer solution storage tank 1 by a chemical pump or the like is mixed with the sludge 4 in the coagulation stirring tank 3 to form sludge flocs. The sludge flocs are supplied to the gravity dehydration section of the dehydrator, and the water content of the sludge is lowered by gravity dehydration, and the sludge that gravity falls from the reversing section onto the lower filter cloth is trapped in the polymer solution storage tank 2 by the cationic polyamidine polymer aggregation of the present invention. While supplying the agent, the sludge and the polymer are mixed and stirred by the impact force of the fall. If necessary, a power mixing device may be added. This is called the secondary addition of polymer. The polymer coagulant used for the secondary addition of the polymer and the polymer coagulant added to the sludge coagulation stirring tank have the advantage that the equipment can be shared, but the use of different coagulants is excluded. is not. Gravity dewatering sludge that has fallen on the lower filter cloth is dehydrated by a large number of rollers on opposite rollers, and then the curvature of the two layers of filter cloth is changed to positive or negative by a large diameter roller to add shearing to the cake to increase the pressure density. Higher water content lowers. The water content of the discharged dehydrated cake is 1
Percentage is obtained by dividing the weight loss on drying at the time when the material has been heated and dried overnight with a ventilation dryer at 05 ° C to a constant weight by the weight of the wet cake before drying. In this test, Sample 1 was used as the polymer flocculant added to the flocculation stirring tank for sludge flocculation, but it is also possible to use a (meth) acrylic polymer flocculant such as P-DMC. It is a range.
【０００７】[0007]
【発明の効果】水産加工排水の活性汚泥法の余剰汚泥の
脱水試験の結果を表ー２に示す。[Effect of the invention] Table 2 shows the results of the dehydration test of excess sludge by the activated sludge method of the seafood processing wastewater.
【表−２】 都市下水汚泥の沈殿汚泥と活性汚泥法の余剰汚泥の混合
汚泥の脱水試験の結果を表−３に示す。[Table-2] Table 3 shows the results of the dehydration test of the mixed sludge of the settled sludge of municipal sewage sludge and the excess sludge of the activated sludge method.
【表−３】 表−２および表−３より明らかな様に本願発明の含水率
低下効果は顕著であり焼却や埋め立て等の最終処分の経
費削減に有効である。[Table-3] As is clear from Tables 2 and 3, the water content lowering effect of the present invention is remarkable, and is effective in reducing the cost of final disposal such as incineration and landfill.
【図ー１】発明を使用する汚泥脱水のフローシートの一
例の説明図である。FIG. 1 is an explanatory view of an example of a flow sheet for sludge dewatering using the invention.
１：汚泥凝集用ポリマー溶液貯槽 ２：二次添加用ポリマー溶液貯槽 ３：凝集攪拌槽 ４：汚泥 1: Sludge flocculation polymer solution storage tank 2: Secondary addition polymer solution storage tank 3: Coagulation stirring tank 4: Sludge
Claims (5)
脱水操作を行った後の汚泥に、下記式（１）または
（２）で表される構造単位を５モル％以上含有するカチ
オン性高分子凝集剤を添加混合した後に、加圧脱水工程
を経て脱水ケーキを得る事を特徴とする汚泥脱水方法。 【化−１】 【化−２】 （式中Ｒ1 , Ｒ2 は水素原子またはメチル基をＸ- は陰
イオンを表す。）1. A cationic polymer agglomerate containing 5 mol% or more of a structural unit represented by the following formula (1) or (2) in sludge after gravity dehydration operation in a belt press type sludge dewatering machine. A sludge dewatering method comprising obtaining a dehydrated cake through a pressure dewatering step after adding and mixing the agent. Embedded image Embedded image (In the formula, R 1 and R 2 represent a hydrogen atom or a methyl group, and X − represents an anion.)
位を５モル％以上含有するカチオン性高分子凝集剤の、
１規定食塩水中で測定した、固有粘度が１〜５ｄｌ／ｇ
である事を特徴とする請求項１に記載の汚泥脱水方法。2. A cationic polymer flocculant containing 5 mol% or more of the structural unit represented by the formula (1) or (2),
Intrinsic viscosity measured in 1N saline is 1-5dl / g
The sludge dewatering method according to claim 1, wherein
位を５モル％以上含有するカチオン性高分子凝集剤を形
成するポリマーのカチオン性コロイド当量値が３〜８ｍ
ｅｑ／ｇである事を特徴とする請求項１に記載の汚泥脱
水方法。3. The cationic colloid equivalent value of the polymer forming the cationic polymer flocculant containing 5 mol% or more of the structural unit represented by the formula (1) or (2), is 3 to 8 m.
It is eq / g, The sludge dewatering method of Claim 1 characterized by the above-mentioned.
位を５モル％以上含有するカチオン性高分子凝集剤を形
成するポリマーがＮ−ビニルホルムアミドとアクリロニ
トリルの共重合体の酸加水分解加熱物である事を特徴と
する請求項１に記載の汚泥脱水方法。4. A polymer forming a cationic polymer flocculant containing 5 mol% or more of the structural unit represented by the formula (1) or (2), wherein the polymer is an acid hydrolyzate of a copolymer of N-vinylformamide and acrylonitrile. The sludge dewatering method according to claim 1, wherein the sludge is dehydrated.
泥または活性汚泥の余剰汚泥と沈殿汚泥の混合汚泥であ
る事を特徴とする請求項１に記載の汚泥脱水方法。5. The sludge dewatering method according to claim 1, wherein the sludge to be dewatered is an excess sludge of activated sludge or a mixed sludge of excess sludge of activated sludge and settled sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7264697A JPH0985013A (en) | 1995-09-20 | 1995-09-20 | Dehydration of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7264697A JPH0985013A (en) | 1995-09-20 | 1995-09-20 | Dehydration of sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0985013A true JPH0985013A (en) | 1997-03-31 |
Family
ID=17406938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7264697A Pending JPH0985013A (en) | 1995-09-20 | 1995-09-20 | Dehydration of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0985013A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009183889A (en) * | 2008-02-07 | 2009-08-20 | Daiyanitorikkusu Kk | Sludge dehydration method |
| JP2020062589A (en) * | 2018-10-16 | 2020-04-23 | 水ｉｎｇ株式会社 | Sludge dewatering method |
-
1995
- 1995-09-20 JP JP7264697A patent/JPH0985013A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009183889A (en) * | 2008-02-07 | 2009-08-20 | Daiyanitorikkusu Kk | Sludge dehydration method |
| JP2020062589A (en) * | 2018-10-16 | 2020-04-23 | 水ｉｎｇ株式会社 | Sludge dewatering method |
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