JPH1128499A - Sludge dewatering method - Google Patents
Sludge dewatering methodInfo
- Publication number
- JPH1128499A JPH1128499A JP10131911A JP13191198A JPH1128499A JP H1128499 A JPH1128499 A JP H1128499A JP 10131911 A JP10131911 A JP 10131911A JP 13191198 A JP13191198 A JP 13191198A JP H1128499 A JPH1128499 A JP H1128499A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- polymer
- cationic group
- dewatering
- polymer flocculant
- 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
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
(57)【要約】
【課題】 有機汚泥を連続真空脱水するに従来より塩化
第二鉄および石灰の使用量の少ない処理方法を提供す
る。
【解決手段】 有機汚泥に（メタ）アクリル系カチオン
性水溶性高分子を塩化第二鉄および石灰と併用して添加
する。該水溶性高分子は、塩化第二鉄と同時添加ないし
塩化第二鉄よりも後に添加する。PROBLEM TO BE SOLVED: To provide a treatment method which uses less ferric chloride and lime than ever before for continuously vacuum dewatering organic sludge. SOLUTION: A (meth) acrylic cationic water-soluble polymer is added to organic sludge in combination with ferric chloride and lime. The water-soluble polymer is added simultaneously with or after ferric chloride.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機汚泥を連続真
空濾過脱水処理するにあたり、無機凝集剤の使用量を削
減し、ケーキ発生量を低減するとともに、ケーキ中の有
機物含有量を増すことによりコンポスト化などのケーキ
処分法を容易にする汚泥の脱水方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a continuous vacuum filtration and dehydration treatment of organic sludge, by reducing the amount of inorganic coagulant used, reducing the amount of cake generated, and increasing the organic matter content in the cake. The present invention relates to a sludge dewatering method that facilitates a cake disposal method such as composting.
【０００２】[0002]
【従来の技術】汚泥にカチオン性高分子凝集剤を添加し
撹拌したのち、無機凝集剤たとえば塩化第二鉄を添加
し、連続真空濾過脱水処理する方法は公知である（特開
昭６３−２６７５００号公報）。2. Description of the Related Art A method of adding a cationic polymer flocculant to sludge and stirring the mixture, adding an inorganic flocculant such as ferric chloride, and subjecting the sludge to continuous vacuum filtration and dehydration is known (JP-A-63-267500). No.).
【０００３】また塩化第二鉄を添加したのちにノニオン
性高分子凝集剤を添加し、最後に石灰を添加して連続真
空濾過脱水処理する技術も開示されている。Further, there is disclosed a technique in which a nonionic polymer flocculant is added after ferric chloride is added, and lime is finally added, followed by continuous vacuum filtration and dehydration treatment.
【０００４】Ｎ−ビニルホルムアミドまたはＮ−ビニル
アセトアミドを必須モノマー成分としてなるポリマーを
加水分解して得られるビニルアミン単位を有するポリマ
ー（特開昭５８−２３８０９号公報、特開昭５９−３９
４００号公報）や、Ｎ−ビニルカルボン酸アミドとアク
リロニトリルを必須成分としてなるポリマーを加水分解
して得られるアミジン単位を有するポリマー（持開平５
−１９２５１３号公報）は、汚泥の凝集脱水剤として良
好な性能を示すことが知られてる。ポリジメチルジアリ
ルアンモニウムクロリドも凝集剤として広く知られてい
る。Polymers having vinylamine units obtained by hydrolyzing a polymer containing N-vinylformamide or N-vinylacetamide as an essential monomer component (JP-A-58-23809, JP-A-59-39)
No. 400) or a polymer having an amidine unit obtained by hydrolyzing a polymer containing N-vinylcarboxylic acid amide and acrylonitrile as essential components (Kyohei Hei 5
192513) is known to exhibit good performance as a flocculant dewatering agent for sludge. Polydimethyldiallylammonium chloride is also widely known as a flocculant.
【０００５】[0005]
【発明が解決しようとする課題】汚泥にカチオン性高分
子凝集剤を添加し撹拌したのち、無機凝集剤たとえば塩
化第二鉄を添加し、連続真空濾過脱水処理する方法はケ
ーキの剛性が低く剥離性が悪い。The method of adding a cationic polymer flocculant to sludge, stirring the sludge, adding an inorganic flocculant such as ferric chloride, and performing continuous vacuum filtration and dehydration treatment has a low rigidity of the cake. Poor.
【０００６】塩化第二鉄を添加したのちにノニオン性高
分子凝集剤を添加し、最後に石灰を添加して連続真空濾
過脱水処理する方法はノニオン性高分子凝集剤を多量に
添加すると凝集汚泥がフロック状となり濾布表面に付着
せずケーキがずり落ちる欠点が有り、過少では塩化第二
鉄および石灰の添加量を減らせず、コントロールが難し
いという欠点があった。本発明においてはコントロール
に苦労することなく塩化第二鉄および石灰の添加量を減
らすことを目的とする。本発明の目的は、有機汚泥を連
続真空濾過脱水処理するにあたり、無機凝集剤の使用量
を削減し、ケーキ発生量を低減するとともにケーキ中の
有機物含有量を増すことによりコンポスト化等のケーキ
処分法を容易にする汚泥の脱水方法を提供することであ
る。A method of adding a nonionic polymer flocculant after the addition of ferric chloride, and finally adding lime and performing a continuous vacuum filtration and dehydration treatment is a method of adding a large amount of the nonionic polymer flocculant to form a flocculated sludge. However, it has a drawback that it becomes floc-like and does not adhere to the surface of the filter cloth and the cake slips off. If the amount is too small, the addition amounts of ferric chloride and lime cannot be reduced, and there is a drawback that control is difficult. An object of the present invention is to reduce the amount of ferric chloride and lime added without difficulty in control. An object of the present invention is to reduce the amount of an inorganic coagulant used in continuous vacuum filtration and dehydration of organic sludge, reduce the amount of cake generated, and increase the organic matter content in the cake, thereby disposing of cake such as composting. It is an object of the present invention to provide a method for dewatering sludge which facilitates the process.
【０００７】[0007]
【課題を解決する為の手段】本発明の請求項１の発明
は、有機汚泥を連続真空濾過脱水処理するにあたり、塩
化第二鉄、カチオン性基を有する高分子凝集剤および石
灰を組み合わせて添加混合することにより汚泥の前処理
を行う方法において、塩化第二鉄の添加混合と同時およ
び／またはその後にカチオン性基を有する高分子凝集剤
を添加混合することを特徴とする汚泥の脱水方法であ
る。According to the first aspect of the present invention, in the continuous dewatering of organic sludge by vacuum filtration, ferric chloride, a polymer flocculant having a cationic group and lime are added in combination. A method of performing pretreatment of sludge by mixing, wherein a polymer flocculant having a cationic group is added and mixed simultaneously with and / or after addition and mixing of ferric chloride. is there.
【０００８】本発明の請求項２の発明は、請求項１に記
載の汚泥の脱水方法において、カチオン性基を有する高
分子凝集剤の添加量が、汚泥ＳＳあたり０．１〜０．５
重量％であることを特徴とする。According to a second aspect of the present invention, in the sludge dewatering method according to the first aspect, the amount of the polymer coagulant having a cationic group added is 0.1 to 0.5 per sludge SS.
% By weight.
【０００９】本発明の請求項３の発明は、請求項１ある
いは請求項２に記載の汚泥の脱水方法において、カチオ
ン性基を有する高分子凝集剤の分子構造が、下記式
（１）で表される水溶性カチオン性ビニル単量体または
その混合物を含有する単量体の重合物から本質的に成る
ことを特徴とする。According to a third aspect of the present invention, in the sludge dewatering method according to the first or second aspect, the molecular structure of the polymer flocculant having a cationic group is represented by the following formula (1). Characterized in that it consists essentially of a polymer of a monomer containing a water-soluble cationic vinyl monomer or a mixture thereof.
【００１０】[0010]
【化２】 Embedded image
【００１１】（但し、式中、ＡはＯまたはＮＨ；ＢはＣ
2 Ｈ4 、Ｃ3 Ｈ6 、Ｃ3 Ｈ5 ＯＨ；Ｒ1 ，はＨまたはＣ
Ｈ3 ；Ｒ2 ，Ｒ3 は炭素数１〜４のアルキル基；Ｒ4 は
水素、メチル基またはベンジル基；Ｘ- はアニオン性対
イオンを表す。）(Where A is O or NH; B is C
2 H 4 , C 3 H 6 , C 3 H 5 OH; R 1 is H or C
H 3 ; R 2 and R 3 each represent an alkyl group having 1 to 4 carbon atoms; R 4 represents hydrogen, a methyl group or a benzyl group; and X − represents an anionic counter ion. )
【００１２】本発明の請求項４の発明は、請求項１ある
いは請求項２に記載の汚泥の脱水方法において、カチオ
ン性基を有する高分子凝集剤がＮ−ビニルカルボン酸ア
ミド（共）重合物の加水分解物から本質的に成ることを
特徴とする。According to a fourth aspect of the present invention, in the sludge dewatering method according to the first or second aspect, the polymer flocculant having a cationic group is an N-vinylcarboxylic acid amide (co) polymer. Characterized by consisting essentially of a hydrolyzate of
【００１３】本発明の請求項５の発明は、請求項１ある
いは請求項２に記載の汚泥の脱水方法において、カチオ
ン性基を有する高分子凝集剤がジメチルジアリルアンモ
ニウムクロリド（共）重合物から本質的に成ることを特
徴とする。According to a fifth aspect of the present invention, in the method for dewatering sludge according to the first or second aspect, the polymer flocculant having a cationic group is essentially a dimethyldiallylammonium chloride (co) polymer. It is characterized by becoming.
【００１４】本発明の請求項６の発明は、請求項１から
請求項５のいずれかに記載の汚泥の脱水方法において、
カチオン性基を有する高分子凝集剤のコロイド当量値が
２．０ｍｅｑ／ｇ以上であることを特徴とする。According to a sixth aspect of the present invention, there is provided a method for dewatering sludge according to any one of the first to fifth aspects,
The polymer coagulant having a cationic group has a colloid equivalent value of 2.0 meq / g or more.
【００１５】本発明の請求項７の発明は、請求項１から
請求項５のいずれかに記載の汚泥の脱水方法において、
カチオン性基を有する高分子凝集剤の１規定食塩水中に
おける固有粘度が３〜１０ｄｌ／ｇであることを特徴と
する。According to a seventh aspect of the present invention, there is provided a method for dewatering sludge according to any one of the first to fifth aspects,
The polymer coagulant having a cationic group has an intrinsic viscosity of 3 to 10 dl / g in 1N saline.
【００１６】[0016]
【発明の実施の形態】本発明の第一の限定は、有機汚泥
を連続真空濾過脱水処理するにあたり、塩化第二鉄、カ
チオン性基を有する高分子凝集剤および石灰を組み合わ
せて添加混合することにより汚泥の前処理を行う方法に
おいて、塩化第二鉄の添加混合と同時および／またはそ
の後にカチオン性基を有する高分子凝集剤を添加混合す
ることを特徴とする汚泥の脱水方法である。ここに言う
連続真空濾過脱水処理とは下水の汚泥処理施設で多用さ
れているオリバーフィルター又はベルトフィルターなど
の脱水機による処理を指す。BEST MODE FOR CARRYING OUT THE INVENTION The first limitation of the present invention is to add and mix ferric chloride, a polymer flocculant having a cationic group and lime in a continuous vacuum filtration and dehydration treatment of organic sludge. Is a method of pretreating sludge by adding and mixing a polymeric coagulant having a cationic group simultaneously with and / or after the addition and mixing of ferric chloride. The continuous vacuum filtration and dehydration treatment referred to herein refers to treatment by a dehydrator such as an Oliver filter or a belt filter that is frequently used in a sewage sludge treatment facility.
【００１７】本発明の目的は上記連続真空濾過脱水処理
において通常用いられている塩化第二鉄および石灰の使
用量を半減させ、汚泥の焼却処理により発生する灰分の
量を大幅に低減し、最終廃棄処理場に送られる廃棄物の
量が減少することから処分場の延命ができる利点を目的
とするものである。An object of the present invention is to reduce the amount of ferric chloride and lime used in the continuous vacuum filtration and dehydration treatment by half, to greatly reduce the amount of ash generated by sludge incineration treatment, The purpose is to extend the life of the disposal site because the amount of waste sent to the disposal site is reduced.
【００１８】前記有機汚泥としては各種汚泥が対象とな
りうるが現在連続真空濾過脱水処理を使用しているのは
下水処理場のみであり、下水の嫌気性消化汚泥・初沈汚
泥・活性汚泥の余剰汚泥またはこれらの混合汚泥が本発
明の対象となる。Although various types of sludge can be used as the organic sludge, continuous vacuum filtration and dewatering are currently used only in sewage treatment plants, and excess sewage anaerobic digested sludge, primary sludge and activated sludge are used. Sludge or a mixed sludge thereof is an object of the present invention.
【００１９】ここに言うカチオン性基を有する高分子凝
集剤としては、ジアルキルアミノアルキル（メタ）アク
リレートの塩または四級化物、ジアルキルアミノアルキ
ル（メタ）アクリルアミドの塩または四級化物、ジアル
キルジアリルアンモニウム塩、などのカチオン性単量体
を含有する単量体の（共）重合物が挙げられ、該カチオ
ン性単量体の単独重合体あるいはアクリルアミドなどと
の共重合体またはアクリル酸などの共重合によりアニオ
ン性基を導入した両性高分子凝集剤などが好ましく用い
られる。Examples of the polymer flocculant having a cationic group include dialkylaminoalkyl (meth) acrylate salts or quaternary compounds, dialkylaminoalkyl (meth) acrylamide salts or quaternary compounds, and dialkyldiallylammonium salts And a (co) polymer of a monomer containing a cationic monomer such as, for example, a homopolymer of the cationic monomer or a copolymer with acrylamide or a copolymer of acrylic acid or the like. An amphoteric polymer flocculant into which an anionic group is introduced is preferably used.
【００２０】またＮ−ビニルホルムアミド・アクリロニ
トリル共重合物の加水分解物なども好ましく用いられ
る。更にジメチルジアリルアンモニウム塩（共）重合物
なども好ましく用いられる。A hydrolyzate of N-vinylformamide / acrylonitrile copolymer is also preferably used. Further, a dimethyldiallylammonium salt (co) polymer is preferably used.
【００２１】上記カチオン性基を有する高分子凝集剤に
替えてポリアクリルアミド系あるいはポリアクリル酸ヒ
ドラジッド系などのノニオン性高分子凝集剤を用いた場
合はフロックが過大となって濾布に付着しないか微細フ
ロックと成って濾過脱水不能と成りやすく、実用に耐え
ない。When a nonionic polymer flocculant such as polyacrylamide or polyacrylic acid hydrazide is used in place of the polymer flocculant having a cationic group, the floc is excessively large and does not adhere to the filter cloth. It becomes fine floc and cannot be filtered and dewatered easily, and is not practical.
【００２２】塩化第二鉄とカチオン性基を有する高分子
凝集剤の添加順序は塩化第二鉄で汚泥を調質した後にカ
チオン性基を有する高分子凝集剤が添加されることが好
ましく、実装置ではカチオン性基を有する高分子凝集剤
の混和槽を新設することが経済的に困難であることから
塩化第二鉄とカチオン性基を有する高分子凝集剤の同時
添加となる。The order of adding the ferric chloride and the polymer flocculant having a cationic group is preferably such that the sludge is treated with ferric chloride and then the polymer flocculant having a cationic group is added. Since it is economically difficult to newly install a mixing tank for a polymer flocculant having a cationic group in the apparatus, ferric chloride and a polymer flocculant having a cationic group are added simultaneously.
【００２３】塩化第二鉄で汚泥を調質する前にカチオン
性高分子凝集剤などのカチオン性基を有する高分子凝集
剤を添加すると汚泥に均等にカチオン性高分子凝集剤な
どが分配されない。If a polymer flocculant having a cationic group such as a cationic polymer flocculant is added before the sludge is refined with ferric chloride, the cationic polymer flocculant and the like are not evenly distributed to the sludge.
【００２４】石灰は濾過助材およびＰＨ調整剤として必
須のものであり、フロックを適度の粒径にそろえると共
に機材の腐食を防止する作用もある。石灰添加後にカチ
オン性高分子凝集剤などを添加しても凝集し濾過性を向
上させるものであり、本発明の範囲に包含される。Lime is essential as a filter aid and a pH adjuster, and has a function of adjusting floc to an appropriate particle size and preventing corrosion of equipment. Even if a cationic polymer flocculant or the like is added after the addition of lime, it flocculates and improves the filterability, and is included in the scope of the present invention.
【００２５】塩化第二鉄は通常３８％水溶液として市販
されており、汚泥ＳＳあたり有姿５％（純分１．９％）
以上添加され、石灰はこの塩化第二鉄によるＰＨ低下を
補正する量以上添加される。石灰を濾過助材として使用
する場合は多量添加を必要とするが、各種の濾過助材を
併用することにより添加量の必要量を減ずることができ
る。Ferric chloride is usually marketed as a 38% aqueous solution, and has a solid form of 5% per sludge SS (a pure content of 1.9%).
The lime is added above the amount that compensates for the decrease in PH due to ferric chloride. When lime is used as a filter aid, it needs to be added in a large amount, but by using various filter aids together, the required amount of addition can be reduced.
【００２６】本発明の第二の限定は、請求項１に記載の
汚泥の脱水方法において、カチオン性基を有する高分子
凝集剤の添加量が汚泥ＳＳあたり０．１〜０．５重量％
であることを特徴とする。A second limitation of the present invention is that, in the method for dewatering sludge according to claim 1, the amount of the polymer coagulant having a cationic group added is 0.1 to 0.5% by weight per sludge SS.
It is characterized by being.
【００２７】０．１重量％以下であるとフロックができ
ず濾過不良となり、０．５重量％以上であると粗大フロ
ックとなって濾布に付着しなくなるおそれが発生するう
え経済的にメリットが無い。If the content is less than 0.1% by weight, floc cannot be formed, resulting in poor filtration. If the content is more than 0.5% by weight, a coarse floc may not be adhered to the filter cloth, which is economically advantageous. There is no.
【００２８】本発明の第三の限定は、請求項１あるいは
請求項２に記載の汚泥の脱水方法において、カチオン性
基を有する高分子凝集剤の分子構造が、前記式（１）で
表される水溶性カチオン性ビニル単量体またはその混合
物を含有する単量体の重合物から本質的に成ることを特
徴とする。According to a third limitation of the present invention, in the sludge dewatering method according to claim 1 or 2, the molecular structure of the polymer flocculant having a cationic group is represented by the above formula (1). Or a polymer of a monomer containing a water-soluble cationic vinyl monomer or a mixture thereof.
【００２９】本発明の第四の限定は、請求項１あるいは
請求項２に記載の汚泥の脱水方法において、カチオン性
基を有する高分子凝集剤がＮ−ビニルカルボン酸アミド
（共）重合物の加水分解物から本質的に成ることを特徴
とする。Ｎ−ビニルホルムアミド・アクリロニトリル共
重合物の加水分解物が、これらの中で最も好ましく用い
られる。A fourth limitation of the present invention is that, in the method for dewatering sludge according to claim 1 or 2, the polymer flocculant having a cationic group is an N-vinylcarboxylic acid amide (co) polymer. It is characterized by consisting essentially of a hydrolyzate. Hydrolysates of N-vinylformamide / acrylonitrile copolymer are most preferably used among these.
【００３０】本発明の第五の限定は、請求項１あるいは
請求項２に記載の汚泥の脱水方法において、カチオン性
基を有する高分子凝集剤がジメチルジアリルアンモニウ
ムクロリド（共）重合物から本質的に成ることを特徴と
する。A fifth limitation of the present invention is that, in the method for dewatering sludge according to claim 1 or 2, the polymer flocculant having a cationic group is essentially a dimethyldiallylammonium chloride (co) polymer. It is characterized by becoming.
【００３１】本発明の第六の限定は、請求項１から請求
項５のいずれかに記載の汚泥の脱水方法において、カチ
オン性基を有する高分子凝集剤のコロイド当量値が２．
０ｍｅｑ／ｇ以上であることを特徴とする。カチオンの
コロイド当量値が低いと塩化第二鉄で調質した汚泥が適
度の大きさのフロックを形成しない。A sixth limitation of the present invention is that, in the method for dewatering sludge according to any one of claims 1 to 5, the colloid equivalent value of the polymer flocculant having a cationic group is 2.
0 meq / g or more. If the colloid equivalent value of the cation is low, the sludge conditioned with ferric chloride does not form moderately large flocs.
【００３２】本発明の第七の限定は、請求項１から請求
項５のいずれかに記載の汚泥の脱水方法において、カチ
オン性基を有する高分子凝集剤の１規定食塩水中におけ
る固有粘度が３〜１０ｄｌ／ｇであることを特徴とす
る。固有粘度が３ｄｌ／ｇ以下であると生成フロックが
微小に過ぎ濾過脱水が困難であり、固有粘度が１０ｄｌ
／ｇ以上であるとフロックサイズが過大となり濾布に付
着しない。A seventh limitation of the present invention is that, in the method for dewatering sludge according to any one of claims 1 to 5, the intrinsic viscosity of the polymer flocculant having a cationic group in 1N saline solution is 3%. -10 dl / g. When the intrinsic viscosity is 3 dl / g or less, the formed floc is so small that filtration and dehydration are difficult, and the intrinsic viscosity is 10 dl / g.
/ G or more, the floc size becomes excessive and does not adhere to the filter cloth.
【００３３】[0033]
【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.
【００３４】（実施例１〜４）撹拌機を備えつけた５ｍ
3 のＰＥタンクに、嫌気性消化汚泥４０％、初沈生汚泥
４０％、余剰汚泥２０％の混合汚泥（ＳＳ：２６０００
ｍｇ／ｌ）を採り、表１に記載した量の塩化第二鉄を添
加撹拌したのち、表１記載の高分子凝集剤（ポリマーと
称す）を添加撹拌し、最後に表１に記載した量の石灰を
スラリー状で添加撹拌し、汚泥の調質を完了した。しか
るのち該調質を完了した汚泥をポンプによりベルトフィ
ルターに供給し真空濾過脱水をおこなった。塩化第二鉄
は（ＦｅＣｌ3 ３８％溶液）原液を添加し、高分子凝集
剤（ポリマー）は０．２％水溶液を添加し、石灰は２０
％スラリーで添加した。ベルトフィルターのドラム回転
速度は一周７分２２秒である。脱水処理結果を表１に示
す。(Examples 1 to 4) 5 m equipped with a stirrer
In the PE tank of No. 3 , a mixed sludge of anaerobic digested sludge 40%, primary sludge sludge 40% and surplus sludge 20% (SS: 26000)
mg / l), ferric chloride in the amount shown in Table 1 was added and stirred, then the polymer flocculant (referred to as polymer) shown in Table 1 was added and stirred, and finally the amount shown in Table 1 was added. Was added in a slurry state and stirred to complete the sludge refining. Thereafter, the sludge having been subjected to the refining was supplied to a belt filter by a pump, and dewatered by vacuum filtration. Ferric chloride (FeCl 3 38% solution) stock solution is added, polymer flocculant (polymer) is added 0.2% aqueous solution, lime is 20%
% Slurry. The rotation speed of the drum of the belt filter is 7 minutes 22 seconds. Table 1 shows the results of the dehydration treatment.
【００３５】なお、表１および後述する表２中の試料と
は高分子凝集剤（ポリマー）のことであり以下の組成で
ある。 試料−１：メタクリロイロキシエチルトリメチルアンモ
ニウムクロリド単独重合体（固有粘度８．６dl/g、コロ
イド当量値４．８meq/g ） 試料−２：アクリロイロキシエチルジメチルベンジルア
ンモニウムクロリド・アクリロイロキシエチルトリメチ
ルアンモニウムクロリド・アクリルアミド共重合体（固
有粘度９．６dl/g、コロイド当量値２．８meq/g ） 試料−３：アクリロイロキシエチルトリメチルアンモニ
ウムクロリド・アクリルアミド共重合体（固有粘度６．
４dl/g、コロイド当量値４．５meq/g ） 試料−４：アクリロイロキシエチルトリメチルアンモニ
ウムクロリド・アクリルアミド共重合体（固有粘度９．
４dl/g、コロイド当量値３．５meq/g ） 試料−５：Ｎビニルホルムアミド・アクリロニトリル共
重合物の塩酸加水分解物（固有粘度３．４dl/g、コロイ
ド当量値５．５meq/g ） 試料−６：ポリジメチルジアリルアンモニウムクロリド
（固有粘度３．３dl/g、コロイド当量値６．５meq/g ） 試料−７：市販アクリルアミド単独重合体（固有粘度
９．７dl/g） 試料−８：市販ポリアクリル酸ヒドラジド（固有粘度
９．１dl/g）The samples in Table 1 and Table 2 described below are polymer flocculants (polymers) and have the following compositions. Sample-1: methacryloyloxyethyltrimethylammonium chloride homopolymer (intrinsic viscosity 8.6 dl / g, colloid equivalent value 4.8 meq / g) Sample-2: acryloyloxyethyldimethylbenzylammonium chloride / acryloyloxyethyltrimethyl Ammonium chloride / acrylamide copolymer (intrinsic viscosity 9.6 dl / g, colloid equivalent value 2.8 meq / g) Sample-3: acryloyloxyethyltrimethylammonium chloride / acrylamide copolymer (intrinsic viscosity 6.
4 dl / g, colloid equivalent value 4.5 meq / g) Sample-4: Acryloyloxyethyltrimethylammonium chloride / acrylamide copolymer (intrinsic viscosity 9.
4 dl / g, colloid equivalent value 3.5 meq / g) Sample-5: Hydrochloride hydrolyzate of N-vinylformamide / acrylonitrile copolymer (intrinsic viscosity 3.4 dl / g, colloid equivalent value 5.5 meq / g) Sample- 6: polydimethyldiallylammonium chloride (intrinsic viscosity 3.3 dl / g, colloid equivalent value 6.5 meq / g) Sample-7: commercially available acrylamide homopolymer (intrinsic viscosity 9.7 dl / g) Sample-8: commercially available polyacryl Acid hydrazide (intrinsic viscosity 9.1 dl / g)
【００３６】（比較例１〜２）表１記載の高分子凝集剤
（ポリマー）（試料−７、試料−８）を用いた以外は実
施例１〜４と同様にして脱水試験を行った結果を表１に
示す。(Comparative Examples 1 and 2) The results of a dehydration test performed in the same manner as in Examples 1 to 4 except that the polymer flocculants (polymers) shown in Table 1 (Samples 7 and 8) were used. Are shown in Table 1.
【００３７】（比較例３）高分子凝集剤（ポリマー）を
用いず、塩化第二鉄および石灰の添加量を２倍にした以
外は実施例１〜４と同様にして脱水試験を行った結果を
表１に示す。(Comparative Example 3) A dehydration test was performed in the same manner as in Examples 1 to 4, except that the amount of ferric chloride and lime was doubled without using a polymer flocculant (polymer). Are shown in Table 1.
【００３８】（比較例４）高分子凝集剤（ポリマー）を
用いなかった以外は実施例１〜４と同様にして脱水試験
を行った結果を表１に示す。(Comparative Example 4) Table 1 shows the results of a dehydration test performed in the same manner as in Examples 1 to 4 except that the polymer flocculant (polymer) was not used.
【００３９】[0039]
【表１】 [Table 1]
【００４０】表１から、有機汚泥に（メタ）アクリル系
カチオン性水溶性高分子（試料−１〜試料−４）を塩化
第二鉄および石灰と併用して添加した実施例１〜４は、
塩化第二鉄および石灰の添加量を半分に減らした状態で
剥離性良く運転でき、ケーキの保有する水分も減少した
ことが判る。これに対して、市販アクリルアミド単独重
合体（試料−７）を用いた比較例１や市販ポリアクリル
酸ヒドラジド（試料−８）を用いた比較例２は、塩化第
二鉄および石灰の添加量を半分に減らした状態では剥離
不可であった。高分子凝集剤（ポリマー）を用いず、塩
化第二鉄および石灰の添加量を２倍にした以外は実施例
１〜４と同様にして脱水試験を行った比較例３は剥離性
良く運転できたが、ケーキの保有する水分が多い。高分
子凝集剤（ポリマー）を用いなかった以外は実施例１〜
４と同様にして脱水試験を行った比較例４は、剥離不可
であった。From Table 1, it can be seen that Examples 1-4 in which (meth) acrylic cationic water-soluble polymers (sample-1 to sample-4) were added to organic sludge in combination with ferric chloride and lime.
It can be seen that the operation can be performed with good releasability in a state where the addition amounts of ferric chloride and lime are reduced by half, and the water content of the cake is also reduced. On the other hand, Comparative Example 1 using a commercially available acrylamide homopolymer (Sample-7) and Comparative Example 2 using a commercially available polyacrylic hydrazide (Sample-8) require less amounts of ferric chloride and lime. In the state reduced to half, peeling was impossible. Comparative Example 3 in which the dehydration test was performed in the same manner as in Examples 1 to 4 except that the addition amount of ferric chloride and lime was doubled without using the polymer flocculant (polymer), the operation could be performed with good peelability. However, the cake has a lot of water. Examples 1 to 4 except that no polymer flocculant (polymer) was used.
Comparative Example 4, in which a dehydration test was performed in the same manner as in Example 4, was not peelable.
【００４１】（実施例５〜１３）２リットルのポリビー
カーに、嫌気性消化汚泥５０％初沈生汚泥３５％余剰汚
泥１５％の混合汚泥（ＳＳ：３０，０００ｍｇ／ｌ）を
採り、表２記載量の塩化第二鉄を添加攪拌したのち表２
記載の高分子凝集剤（ポリマー）を添加攪拌し、最後に
表２記載量の石灰をスラリー状で添加攪拌し汚泥の調質
を完了した。汚泥サンプリング量は１リットル、攪拌条
件は各々の薬剤添加後２００ｒｐｍ１分間のジャーテス
ト攪拌を行った。しかるのち該調質を完了した汚泥を用
いて、下水試験法の第４章「一般汚泥試験、第１４節
脱水試験 ４ リーフテスト」の記載に準じて試験を行
った。真空圧は−４００ｍｍＨｇ。リーフ面積９５ｃｍ
2 。リーフを調質汚泥に浸漬する時間は１分間、その後
リーフを引き上げ１分間吸引処理する。最後に、リーフ
に形成された湿ケーキの重量、濾液量、ケーキの剥離
性、さらに１０５℃２４時間乾燥した乾ケーキ重量より
含水率を求めた。結果を表２に記載する。(Examples 5 to 13) Mixed sludge (SS: 30,000 mg / l) containing 50% of anaerobic digested sludge, 35% of primary sludge, and 35% of excess sludge was placed in a 2 liter polybeaker. After adding the indicated amount of ferric chloride and stirring, Table 2
The polymer flocculant (polymer) described was added and stirred, and finally, the amount of lime described in Table 2 was added in a slurry form and stirred to complete the sludge refining. The sludge sampling amount was 1 liter, and stirring conditions were jar test stirring at 200 rpm for 1 minute after each chemical addition. Then, using the sludge that has been subjected to the refining, the sewage test method, Chapter 4, "General Sludge Test, Section 14"
The dehydration test was performed according to the description in “4 Leaf test”. Vacuum pressure is -400 mmHg. Leaf area 95cm
2 . The time for immersing the leaf in the refined sludge is 1 minute, and then the leaf is pulled up and suction-treated for 1 minute. Finally, the water content was determined from the weight of the wet cake formed on the leaf, the amount of the filtrate, the peelability of the cake, and the weight of the dry cake dried at 105 ° C. for 24 hours. The results are shown in Table 2.
【００４２】（比較例５〜６）表２記載の高分子凝集剤
（ポリマー）（試料−７、試料−８）を用いた以外は実
施例７〜１３と同様にして脱水試験を行った結果を表２
に示す。(Comparative Examples 5 to 6) Results of a dehydration test performed in the same manner as in Examples 7 to 13 except that the polymer flocculants (polymers) shown in Table 2 (Samples 7 and 8) were used. Table 2
Shown in
【００４３】（比較例７）高分子凝集剤（ポリマー）を
用いず、実施例５と同様にして脱水試験を行った結果を
表２に示す。(Comparative Example 7) The results of a dehydration test performed in the same manner as in Example 5 without using a polymer flocculant (polymer) are shown in Table 2.
【００４４】（比較例８）高分子凝集剤（ポリマー）を
用いなかった以外は実施例６〜１３と同様にして脱水試
験を行った結果を表２に示す。Comparative Example 8 Table 2 shows the results of a dehydration test performed in the same manner as in Examples 6 to 13 except that the polymer flocculant (polymer) was not used.
【００４５】[0045]
【表２】 [Table 2]
【００４６】表２から、有機汚泥に（メタ）アクリル系
カチオン性水溶性高分子（試料−１〜試料−４）を塩化
第二鉄および石灰と併用して添加した実施例５〜１１
や、Ｎビニルホルムアミド・アクリロニトリル共重合物
の塩酸加水分解物（試料−５）やポリジメチルジアリル
アンモニウムクロリド（試料−６）を塩化第二鉄および
石灰と併用して添加した実施例１２〜実施例１３は、汚
泥処理量が増大し、塩化第二鉄および石灰の添加量を半
分に減らすこともできる。これに対して市販アクリルア
ミド単独重合体（試料−７）を用いた比較例５や市販ポ
リアクリル酸ヒドラジド（試料−８）を用いた比較例６
は、塩化第二鉄および石灰の添加量を半分に減らした状
態では剥離不可であった。高分子凝集剤（ポリマー）を
用いず、実施例５と同様にして脱水試験を行った比較例
７は、汚泥処理量が減少する。高分子凝集剤（ポリマ
ー）を用いなかった以外は実施例６〜１３と同様にして
脱水試験を行った比較例８は剥離不可であった。From Table 2, it can be seen from Examples 5 to 11 that (meth) acrylic cationic water-soluble polymers (sample-1 to sample-4) were added to organic sludge in combination with ferric chloride and lime.
Example 12 to Example in which an N-vinylformamide / acrylonitrile copolymer hydrochloride hydrolyzate (Sample-5) or polydimethyldiallylammonium chloride (Sample-6) was added in combination with ferric chloride and lime. No. 13, sludge treatment amount increases, and the addition amount of ferric chloride and lime can be reduced by half. In contrast, Comparative Example 5 using a commercially available acrylamide homopolymer (Sample-7) and Comparative Example 6 using a commercially available polyacrylic hydrazide (Sample-8)
Could not be peeled off when the amounts of ferric chloride and lime were reduced by half. In Comparative Example 7 in which a dehydration test was performed in the same manner as in Example 5 without using the polymer flocculant (polymer), the sludge treatment amount was reduced. Comparative Example 8 in which a dehydration test was performed in the same manner as in Examples 6 to 13 except that the polymer flocculant (polymer) was not used, was not peelable.
【００４７】[0047]
【発明の効果】カチオン性高分子凝集剤添加により塩化
第二鉄および石灰の添加量を半分に減らした状態でも良
好な汚泥処理効果を示す。本発明の汚泥の脱水方法によ
り、有機汚泥を連続真空濾過脱水処理するにあたり、無
機凝集剤の使用量を削減し、ケーキ発生量を低減すると
ともにケーキ中の有機物含有量を増すことができ、コン
ポスト化などのケーキ処分法を容易に適用できる。EFFECT OF THE INVENTION A good sludge treatment effect can be obtained even when the addition amount of ferric chloride and lime is reduced to half by adding a cationic polymer flocculant. The sludge dewatering method of the present invention can reduce the amount of an inorganic coagulant used in continuous vacuum filtration and dehydration of organic sludge, reduce the amount of cake generated, and increase the organic matter content of the cake, Cake disposal methods such as conversion can be easily applied.
Claims (7)
あたり、塩化第二鉄、カチオン性基を有する高分子凝集
剤および石灰を組み合わせて添加混合することにより汚
泥の前処理を行う方法において、塩化第二鉄の添加混合
と同時および／またはその後にカチオン性基を有する高
分子凝集剤を添加混合することを特徴とする汚泥の脱水
方法。1. A method for pretreating sludge by adding and mixing ferric chloride, a polymer flocculant having a cationic group and lime in a continuous vacuum filtration and dehydration treatment of an organic sludge. A method for dewatering sludge, comprising adding and mixing a polymeric coagulant having a cationic group simultaneously with and / or after the addition and mixing of ferric iron.
加量が、汚泥ＳＳあたり０．１〜０．５重量％であるこ
とを特徴とする請求項１に記載の汚泥の脱水方法。2. The method for dewatering sludge according to claim 1, wherein the amount of the polymer flocculant having a cationic group added is 0.1 to 0.5% by weight per sludge SS.
子構造が、下記式（１）で表される水溶性カチオン性ビ
ニル単量体またはその混合物を含有する単量体の重合物
から本質的に成ることを特徴とする請求項１あるいは請
求項２に記載の汚泥の脱水方法。 【化１】 （但し、式中、ＡはＯまたはＮＨ；ＢはＣ2 Ｈ4 、Ｃ3
Ｈ6 、Ｃ3 Ｈ5 ＯＨ；Ｒ1 ，はＨまたはＣＨ3 ；Ｒ2 ，
Ｒ3 は炭素数１〜４のアルキル基；Ｒ4 は水素、メチル
基またはベンジル基；Ｘ- はアニオン性対イオンを表
す。）3. The molecular structure of a polymer flocculant having a cationic group is essentially a polymer of a water-soluble cationic vinyl monomer represented by the following formula (1) or a monomer containing a mixture thereof. The sludge dewatering method according to claim 1 or 2, wherein the sludge is dehydrated. Embedded image (Where A is O or NH; B is C 2 H 4 , C 3
H 6 , C 3 H 5 OH; R 1 is H or CH 3 ; R 2 ,
R 3 represents an alkyl group having 1 to 4 carbon atoms; R 4 represents hydrogen, a methyl group or a benzyl group; and X − represents an anionic counter ion. )
−ビニルカルボン酸アミド（共）重合物の加水分解物か
ら本質的に成ることを特徴とする請求項１あるいは請求
項２に記載の汚泥の脱水方法。4. The polymer coagulant having a cationic group is N
The sludge dewatering method according to claim 1 or 2, wherein the method is essentially composed of a hydrolyzate of a vinyl carboxylic acid amide (co) polymer.
メチルジアリルアンモニウムクロリド（共）重合物から
本質的に成ることを特徴とする請求項１あるいは請求項
２に記載の汚泥の脱水方法。5. The method for dewatering sludge according to claim 1, wherein the polymer flocculant having a cationic group consists essentially of a dimethyldiallylammonium chloride (co) polymer.
ロイド当量値が２．０ｍｅｑ／ｇ以上であることを特徴
とする請求項１から請求項５のいずれかに記載の汚泥の
脱水方法。6. The method for dewatering sludge according to claim 1, wherein the colloid equivalent value of the polymer flocculant having a cationic group is 2.0 meq / g or more.
規定食塩水中における固有粘度が３〜１０ｄｌ／ｇであ
ることを特徴とする請求項１から請求項５のいずれかに
記載の汚泥の脱水方法。7. A polymer coagulant having a cationic group
The sludge dewatering method according to any one of claims 1 to 5, wherein an intrinsic viscosity in a normal saline is 3 to 10 dl / g.
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|---|---|---|---|
| JP13191198A JP3772287B2 (en) | 1997-05-16 | 1998-05-14 | Sludge dewatering method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14117497 | 1997-05-16 | ||
| JP9-141174 | 1997-05-16 | ||
| JP13191198A JP3772287B2 (en) | 1997-05-16 | 1998-05-14 | Sludge dewatering method |
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|---|---|
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Family
ID=26466620
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017196577A (en) * | 2016-04-28 | 2017-11-02 | 友岡化研株式会社 | Processing method of waste water, and chemical agent for processing waste water |
| JP2018094524A (en) * | 2016-12-15 | 2018-06-21 | オルガノ株式会社 | Wastewater treatment method and wastewater treatment device |
| CN108793676A (en) * | 2018-05-03 | 2018-11-13 | 中国科学院深圳先进技术研究院 | A kind of the composite highly effective dewatering and system of sludge |
| CN111827256A (en) * | 2020-07-09 | 2020-10-27 | 浙江海逸环科院有限公司 | Bottom mud concentration and solidification method and device |
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| JPH06114209A (en) * | 1992-10-07 | 1994-04-26 | Tokiwa Kensetsu Kk | Water treatment agent and water method |
| JPH06182353A (en) * | 1992-12-18 | 1994-07-05 | Taki Chem Co Ltd | Treatment of civil engineearing muddy water |
| JPH06238300A (en) * | 1993-02-12 | 1994-08-30 | Hymo Corp | Sludge dewatering method |
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| JPS54107992A (en) * | 1978-02-14 | 1979-08-24 | Mitsubishi Chem Ind Ltd | Dehydration of cationic water-soluble polymer |
| JPS5781900A (en) * | 1980-11-10 | 1982-05-22 | Ebara Infilco Co Ltd | Concentrating and dehydrating method for organic sludge |
| JPS5881498A (en) * | 1981-11-10 | 1983-05-16 | Ebara Infilco Co Ltd | Dehydration of organic sludge |
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| JPS63252600A (en) * | 1987-03-06 | 1988-10-19 | Mitsui Saianamitsudo Kk | Sludge dehydrating agent |
| JPH01232000A (en) * | 1988-03-11 | 1989-09-18 | Mitsui Saianamitsudo Kk | Dehydrating agent |
| JPH047100A (en) * | 1990-04-25 | 1992-01-10 | Kurita Water Ind Ltd | Dehydration of sludge |
| JPH04293600A (en) * | 1991-03-20 | 1992-10-19 | Kurita Water Ind Ltd | Dehydration of sludge |
| JPH05192513A (en) * | 1991-08-20 | 1993-08-03 | Mitsubishi Kasei Corp | Cationic polymeric flocculant |
| JPH06114209A (en) * | 1992-10-07 | 1994-04-26 | Tokiwa Kensetsu Kk | Water treatment agent and water method |
| JPH06182353A (en) * | 1992-12-18 | 1994-07-05 | Taki Chem Co Ltd | Treatment of civil engineearing muddy water |
| JPH06238300A (en) * | 1993-02-12 | 1994-08-30 | Hymo Corp | Sludge dewatering method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017196577A (en) * | 2016-04-28 | 2017-11-02 | 友岡化研株式会社 | Processing method of waste water, and chemical agent for processing waste water |
| JP2018094524A (en) * | 2016-12-15 | 2018-06-21 | オルガノ株式会社 | Wastewater treatment method and wastewater treatment device |
| CN108793676A (en) * | 2018-05-03 | 2018-11-13 | 中国科学院深圳先进技术研究院 | A kind of the composite highly effective dewatering and system of sludge |
| CN111827256A (en) * | 2020-07-09 | 2020-10-27 | 浙江海逸环科院有限公司 | Bottom mud concentration and solidification method and device |
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|---|---|
| JP3772287B2 (en) | 2006-05-10 |
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