JPS6125700A - Dehydrating method of organic sludge - Google Patents
Dehydrating method of organic sludgeInfo
- Publication number
- JPS6125700A JPS6125700A JP59145613A JP14561384A JPS6125700A JP S6125700 A JPS6125700 A JP S6125700A JP 59145613 A JP59145613 A JP 59145613A JP 14561384 A JP14561384 A JP 14561384A JP S6125700 A JPS6125700 A JP S6125700A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- organic polymer
- polymer flocculant
- cationic
- added
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims description 23
- 125000002091 cationic group Chemical group 0.000 claims abstract description 35
- 125000000129 anionic group Chemical group 0.000 claims abstract description 29
- 229920000620 organic polymer Polymers 0.000 claims description 59
- 238000004062 sedimentation Methods 0.000 claims description 11
- 150000001450 anions Chemical class 0.000 claims description 10
- 150000001768 cations Chemical class 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 abstract description 5
- 229920002401 polyacrylamide Polymers 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000013019 agitation Methods 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 abstract description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 abstract description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 2
- 239000011343 solid material Substances 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 15
- 239000008394 flocculating agent Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005345 coagulation Methods 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 5
- 238000005189 flocculation Methods 0.000 description 5
- 230000016615 flocculation Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 235000014413 iron hydroxide Nutrition 0.000 description 3
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 101000959121 Xenopus laevis Peptidyl-alpha-hydroxyglycine alpha-amidating lyase A Proteins 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 101000959126 Xenopus laevis Peptidyl-alpha-hydroxyglycine alpha-amidating lyase B Proteins 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は凝集沈殿汚泥を含む有機性汚泥の脱水方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for dewatering organic sludge including flocculated sludge.
従来の技術
従来汚泥処理等において発生する有機性汚泥の脱水方法
として、カチオン性有機高分子凝集剤を単独添加する方
法あるいはカチオン性有機高分子凝集剤を添加して攪拌
したのち、アニオン性有機高分子凝集剤を添加する方法
などがあった。Conventional technology As a conventional method for dewatering organic sludge generated in sludge treatment, etc., there is a method in which a cationic organic polymer flocculant is added alone, or a cationic organic polymer flocculant is added and stirred, and then an anionic organic polymer is added. There were methods such as adding a molecular flocculant.
しかしながら、有機性汚泥に凝集沈殿汚泥が含まれると
、これらの方法での脱水効果は必ずしも満埴できるもの
ではなかった。例えばカチオン性有機高分子凝集剤を単
独で添加する方法の場合、生成したフロックの強度が十
分でないため、ベルトプレス脱水機での重力脱水部分で
の水切り性が悪く、またロール・圧搾脱水部でケーキの
広がシが大きいため十分な処理速度が得られなかった。However, when the organic sludge contains coagulated and precipitated sludge, the dewatering effects of these methods are not necessarily satisfactory. For example, in the case of a method in which a cationic organic polymer flocculant is added alone, the strength of the generated flocs is not sufficient, resulting in poor drainage performance in the gravity dewatering section of the belt press dehydrator, and in the roll/press dewatering section. Due to the large spread of the cake, sufficient processing speed could not be obtained.
またカチオン性有機高分子凝集剤を添加して攪拌したの
ち、アニオン性有機高分子凝集剤を添加する方法でも、
十分な脱水効果を得るには、極めて多くのカチオン性有
機高分子凝集剤の添加を必要とするなどの問題があった
。Alternatively, a method in which a cationic organic polymer flocculant is added and stirred, and then an anionic organic polymer flocculant is added;
In order to obtain a sufficient dehydration effect, there were problems such as the need to add an extremely large amount of cationic organic polymer flocculant.
発明が解決しようとする問題点
本発明は以上のような従来法を改良するもので、凝集沈
殿汚泥を含む有機性汚泥を効率よく脱水することができ
る汚泥脱水法を提供することを目的としている。Problems to be Solved by the Invention The present invention improves the conventional methods as described above, and aims to provide a sludge dewatering method that can efficiently dewater organic sludge including coagulated sedimentation sludge. .
問題を解決するだめの手段
本発明は、凝集沈殿汚泥を含む有機性汚泥に、ＰＨ４で
のコロイド荷電量５．０ｍｅｑ／ｇ （以下コロイド荷
電量はｐ）（４での値を示す）以上のアニオン性有機高
分子凝集剤を添加して混合攪拌し、次いでコロイドカチ
オン荷電量４．０ ｍｅｑ／ ｒ 以上のカチオン性有
機高分子凝集剤を添加して脱水することを特徴とするも
のである。Means to Solve the Problem The present invention provides organic sludge including coagulated sedimentation sludge with a colloidal charge amount of 5.0 meq/g (hereinafter referred to as colloidal charge amount p) (value at 4) or more at PH4. It is characterized in that an anionic organic polymer flocculant is added, mixed and stirred, and then a cationic organic polymer flocculant having a colloidal cation charge amount of 4.0 meq/r or more is added and dehydrated.
本発明で対象とする汚泥は、アルミニウム塩や鉄塩など
の金属塩を使用して凝集処理して生成した凝集沈殿汚泥
を含む有機性汚泥である。The sludge targeted by the present invention is organic sludge containing flocculated and precipitated sludge produced by flocculation treatment using metal salts such as aluminum salts and iron salts.
具体的なものの例としては、下水またはし尿の活性汚泥
処理における凝集沈殿による三次処理汚泥、三次処理汚
泥と余剰汚泥等の混合汚泥、各種工場（食品工業、紙パ
ルプ工業など）廃水の生物処理工程での凝集沈殿で生成
した凝集沈殿汚泥。Specific examples include tertiary treatment sludge by coagulation and sedimentation in activated sludge treatment of sewage or human waste, mixed sludge of tertiary treatment sludge and surplus sludge, biological treatment of wastewater from various factories (food industry, pulp and paper industry, etc.) Coagulation and sedimentation sludge produced by coagulation and sedimentation.
凝集沈殿汚泥と余剰汚泥等の混合汚泥などがある。There are mixed sludges such as coagulated sedimentation sludge and surplus sludge.
これらの汚泥は、微生物などの有機物質と水酸化アルミ
ニウムあるいは水酸化鉄などの金属水酸化物の両方を含
む汚泥である。These sludges contain both organic substances such as microorganisms and metal hydroxides such as aluminum hydroxide or iron hydroxide.
作用
以下に本発明及びその作用について、さらに詳細に説明
する。Effects The present invention and its effects will be explained in more detail below.
前述のような汚泥は汚泥の性状が不安定であるため、最
適条件で脱水するには、一般にカチオン性有機高分子凝
集剤、アニオン性有機高分子凝集剤、ノニオン性有機高
分子凝集剤の全般にわたって数多くの有機高分子凝集剤
を用意しなければならない。Since the properties of the sludge mentioned above are unstable, in order to dehydrate it under optimal conditions, it is generally necessary to use a cationic organic polymer flocculant, an anionic organic polymer flocculant, or a nonionic organic polymer flocculant. A large number of organic polymer flocculants must be prepared over the course of the process.
このように汚泥性状が不安定であることの原因は明確で
はないが、一応次のように考えられる。Although the cause of such unstable sludge properties is not clear, it is thought to be as follows.
すなわち有機性懸濁物質は強いアニオン性を有するが、
凝集沈殿に起因するカチオン性を有するアルミニウム、
鉄の水酸化物の添加量が増加するにつれ汚泥のアニオン
性は中和される傾向にある。In other words, organic suspended solids have strong anionic properties, but
Aluminum with cationic properties resulting from coagulation and precipitation,
As the amount of iron hydroxide added increases, the anionic nature of the sludge tends to be neutralized.
そして水酸化物がさらに多く添加されると汚泥の表面は
カチオン性を示すようになる。つまり、懸濁液中の有機
物質のアニオン量に対する、アルミニウム、鉄水酸化物
のカチオン量の相対的な関係で汚泥の性状が変化する。When more hydroxide is added, the surface of the sludge becomes cationic. In other words, the properties of the sludge change depending on the relative relationship between the amount of cations of aluminum and iron hydroxides to the amount of anions of organic substances in the suspension.
これにより実際処理においては、廃水の性状が相対的に
経時変化するため、アルミニウムまたは鉄を含む無機凝
集剤の添加量が一定であっても、発生する凝集沈殿汚泥
の性状は変化する。また廃水の種類が異なる場合の汚泥
の性状は非常に異なったも、のであると考えられる。As a result, in actual treatment, the properties of wastewater change relatively over time, so even if the amount of inorganic flocculant containing aluminum or iron added is constant, the properties of the generated flocculated and precipitated sludge change. It is also believed that the properties of sludge from different types of wastewater are very different.
本発明の脱水法はこのような性状の変化する汚泥に対し
ても効果的に脱水処理を行うことができる。The dewatering method of the present invention can effectively dewater sludge whose properties change as described above.
従来よシ、アニオン性有機高分子凝集剤を添加して混合
攪拌した後、カチオン性有機高分子凝集剤を添加して凝
集させる方法は行なわれていなかったわけではない。例
えば有機性汚泥にアニオン性有機高分子凝集剤を添加し
た後、カチオン性有機高分子凝集剤を加えて凝集させる
と有機高分子凝集剤の低減できることが知られている（
特公昭３９−１７４９２）。Conventionally, a method has been used in which an anionic organic polymer flocculant is added, mixed and stirred, and then a cationic organic polymer flocculant is added to cause flocculation. For example, it is known that the amount of organic polymer flocculants can be reduced by adding an anionic organic polymer flocculant to organic sludge and then adding a cationic organic polymer flocculant to coagulate it (
Special Publication No. 39-17492).
また無機系の汚泥を処理する際にアニオン性有機高分子
凝集剤とカチオン性有機高分子凝集剤またはカチオン性
無機凝集剤を併用することも知られている（特開昭５０
．−１１０９７２）。It is also known to use an anionic organic polymer flocculant, a cationic organic polymer flocculant, or a cationic inorganic flocculant in combination when treating inorganic sludge (Japanese Patent Application Laid-Open No. 1983-1991).
．． -110972).
しかしながら、本発明のようなアニオン性有機高分子凝
集剤とカチオン性有機高分子凝集剤の組合せが、凝集沈
殿汚泥を含む有機性汚泥の脱水に特に効果的であること
は全く知られていない。However, it is completely unknown that the combination of an anionic organic polymer flocculant and a cationic organic polymer flocculant as in the present invention is particularly effective for dewatering organic sludge including coagulated and settled sludge.
本発明において用いられるアニオン性有様高分子凝集剤
としては、ｐＨ４，０でのコロイドアニオン荷電量が５
．０ ｍｅｑ ／ Ｓ’以上のアニオン性有機高分子凝
集剤であれば何でも良い。The anionic polymer flocculant used in the present invention has a colloidal anion charge of 5 at pH 4.0.
．． Any anionic organic polymer flocculant having a value of 0 meq/S' or more may be used.
このような有機高分子凝集剤としては、ポリアクリル酸
ノーダ、ポリアクリルアミドの部分加水分解変性物、ポ
リビニルスルホン酸などがある。Examples of such organic polymer flocculants include polyacrylic acid, partially hydrolyzed modified polyacrylamide, and polyvinyl sulfonic acid.
通常は加水分解率が５０モルチ以上のぼりアクリルアミ
ド部分加水分解変性物を汚泥の性状に合せて使用する。Usually, a partially hydrolyzed modified acrylamide with a hydrolysis rate of 50 molt or more is used depending on the properties of the sludge.
分子量は百方以上のものであればよく、分子量の大きい
ものが一層効果的である。最適添加率は、凝集沈殿汚泥
を含む有機性汚泥の性状によって変動するので一層に規
定できないが、汚泥の乾燥固形物当り０．０１〜０．５
チの比較的小さな添加率の範囲内で効果がある。The molecular weight may be one hundred or more, and those with larger molecular weights are more effective. The optimum addition rate cannot be further specified because it varies depending on the properties of organic sludge including coagulated sedimentation sludge, but it is 0.01 to 0.5 per dry solid of sludge.
It is effective within a relatively small addition rate of H.
１だ、アニオン性有機高分子凝集剤の添加率は、有機性
汚泥に含まれる凝集沈殿汚泥の割合が太きくなると増加
する傾向にある。1. The addition rate of anionic organic polymer flocculant tends to increase as the proportion of coagulated and precipitated sludge contained in organic sludge increases.
また、本発明において用いられるカチオン性有機高分子
凝集剤としては、ＰＨ４，０でのコロイドカチオン荷電
量が４．０以上のカチオン性有機高分子凝集剤であれば
何でもよい。Further, as the cationic organic polymer flocculant used in the present invention, any cationic organic polymer flocculant having a colloidal cation charge amount of 4.0 or more at pH 4.0 may be used.
このような有機高分子凝集剤としては、ポリアルキルア
ミノエチルアクリレート、ポリアルキルアミノメタクリ
レート、ポリアクリルアミドのカチオン変性物、ポリア
ミン、ポリエチレンイミン、ポリノアリルアンモニウム
ハライド、キトサン、ポリビニルイミダシリンなどがあ
る。これらのカチオン性有１決高分子凝集剤の中から、
汚泥の性状、脱水機の種類に応じて使用する。通常は、
ｐＨ４，０でのコロイドカチオン荷電量が４゜０ｒｎｅ
ｑ／ｒ以上のポリアルキルアミノメタクリレート（通常
ＤＭ系凝集剤と呼ばれている）を汚泥の性状に合せて使
用する。Examples of such organic polymer flocculants include polyalkylaminoethyl acrylate, polyalkylaminomethacrylate, cationic modified polyacrylamide, polyamine, polyethyleneimine, polynoallylammonium halide, chitosan, and polyvinylimidacillin. Among these cationic polymer flocculants,
Use depending on the properties of the sludge and the type of dehydrator. Normally,
Colloidal cation charge amount at pH 4.0 is 4゜0rne
A polyalkylamino methacrylate (usually called a DM flocculant) having a ratio of q/r or higher is used in accordance with the properties of the sludge.
通常分子量が百方以上のものであると強くて、大きなフ
ロックが生成する。カチオン性有機高分子凝集剤の最適
添加率も、汚泥性状によって変動するので一層に規定で
きないが、汚泥の固形物当り０．３〜２．０％の比較的
小さな添加率の範囲内で効果がある。Usually, when the molecular weight is more than 100, strong and large flocs are generated. The optimal addition rate of the cationic organic polymer flocculant cannot be further defined as it varies depending on the sludge properties, but it is effective within a relatively small addition rate of 0.3 to 2.0% based on the solids of the sludge. be.
凝集方法は、壷初にコロイドアニオン荷電量５．０ｍｅ
ｑ／ｒ以上のアニオン性有機高分子凝集剤を汚泥に添加
し、十分混合攪拌を行う。この場合、攪拌の目的はフロ
ックの生成ではないので、アニオン性有機高分子凝集剤
と汚泥が十分混合されて、吸着反応するように通常の攪
拌より強い攪拌を行うのが好ましい。The aggregation method uses a colloidal anion charge of 5.0me at the beginning of the jar.
An anionic organic polymer flocculant of q/r or more is added to the sludge and thoroughly mixed and stirred. In this case, since the purpose of stirring is not to generate flocs, it is preferable to perform stronger stirring than normal stirring so that the anionic organic polymer flocculant and sludge are sufficiently mixed and an adsorption reaction occurs.
つぎにコロイドカチオン荷電量４．０ｍｅｑ／Ｖ以上の
カチオン性有機高分子凝集剤を添加し、攪拌によりフロ
ックを生成させる。この場合、攪拌はできるだけ大形の
フロックを生成するような通常の攪拌でよい。攪拌は、
攪拌槽における攪拌羽根による攪拌に限らず、配管中の
流れによるものや、渦巻ポンプ等のポンプを通過させる
ことによるものでもよい。Next, a cationic organic polymer flocculant having a colloidal cation charge amount of 4.0 meq/V or more is added, and flocs are generated by stirring. In this case, agitation may be normal agitation that produces as large a floc as possible. The stirring is
Stirring is not limited to stirring using a stirring blade in a stirring tank, but may also be based on a flow in piping or passing through a pump such as a centrifugal pump.
攪拌機を備えた攪拌槽の場合、目安とし７て強い攪拌は
攪拌羽根の周速を０．５〜３ｍ／ｓｅｅ、通常の攪拌の
周速は０．１〜０．５ｍ／ｓｅｃ とすることができる
。In the case of a stirring tank equipped with an agitator, as a guideline 7, the peripheral speed of the stirring blade should be 0.5 to 3 m/sec for strong stirring, and 0.1 to 0.5 m/sec for normal stirring. can.
以上の凝集により生成したフロックをその一！ま、また
は分離水を除去したのち、脱水機に供給し、従来法と同
様にして脱水を行う。脱水機としては、遠心脱水機、真
空脱水機、ベルトプレス脱水機、スクリュープレス又は
フィルタプレス等の従来よシ使用されている脱水機が使
用可能である。The flocs generated by the above agglomeration are one of them! After removing the separated water, it is supplied to a dehydrator and dehydrated in the same manner as in the conventional method. As the dehydrator, conventionally used dehydrators such as a centrifugal dehydrator, a vacuum dehydrator, a belt press dehydrator, a screw press, or a filter press can be used.
ペルトゲレス型脱水機の場合、従来は剥離性や炉布から
のはみ出しの点から圧搾圧を０．５ ｋｇ／ｃｒｉ１以
上にすることが困難であったが、本発明の方法では１
ｋＶ／ｃｒ／Ｉ以上の高圧ががけられ、圧搾圧に応じて
低い含水率の脱水ケーキが得られる。In the case of a Peltogelles type dehydrator, it has conventionally been difficult to increase the squeezing pressure to 0.5 kg/cri1 or higher due to peelability and protrusion from the oven cloth, but with the method of the present invention, it is difficult to increase the squeezing pressure to 1.
A high pressure of kV/cr/I or more is applied, and a dehydrated cake with a low moisture content is obtained depending on the pressing pressure.
本発明の方法で処理した場合に生じる現象の機構は必ず
しも明らかでないが、凝集沈殿汚泥を含む有機性汚泥中
には表面がアニオン性に帯電している粒子とカチオン性
に帯電している粒子が混在していること、強アニオン性
の有機高分子凝集剤と強力チオン性の有機高分子凝集剤
が必要なこと及び強アニオン性の有機高分子凝集剤を最
初に添加しなければならない等の現象から総合判断する
と次のように考えられる。The mechanism of the phenomenon that occurs when treated by the method of the present invention is not necessarily clear, but in organic sludge including coagulated sedimentation sludge, there are particles whose surfaces are anionically charged and particles whose surface is cationically charged. Phenomena such as mixing, the need for a strong anionic organic polymer flocculant and a strong thionic organic polymer flocculant, and the need to add the strong anionic organic polymer flocculant first. Comprehensive judgment can be made as follows.
すなわち最初に添加した強アニオン性の有機高分子凝集
剤は表面がカチオン性の粒子（金属水酸化物）と効率的
に反応し、粒子表面の荷電をアニオン性に変えると推定
される。このような状況下ではほとんどすべての粒子表
面はアニオン性に荷電した状態になっていると推察され
る。そこへ強力チオン性の有機高分子凝集剤を添加する
と、すべての粒子がそれと強固に反応して強いフロック
を生成すると考えられる。この場合同時に未反応の先に
添加した強アニオン性のｔ＋機高分子凝渠剤と強力チオ
ン性の有機高分子凝集剤とが反応して７０ツク化をさら
に強固にするものと考えられる。That is, it is presumed that the strongly anionic organic polymer flocculant added first reacts efficiently with the particles (metal hydroxide) whose surface is cationic, and changes the charge on the particle surface to anionic. Under such circumstances, it is assumed that almost all particle surfaces are anionically charged. It is thought that if a strong thionic organic polymer flocculant is added thereto, all the particles will react strongly with it to form a strong floc. In this case, it is considered that at the same time, the previously added unreacted strong anionic t+ organic polymer flocculant reacts with the strong thionic organic polymer flocculant to further strengthen the 70-layer structure.
先に強力チオン性有機高分子凝集剤を添加した後、アニ
オン性有機高分子凝集剤を添加した場合も同様な現象が
起ると考えられるが、表面がアニオン性の粒子をすべて
カチオン性に転換するにはかなり多くのカチオン性の有
機高分子凝集剤を必要とすると推定される。したがって
、このような方法で十分な効果を得るには、極めて多量
のカチオン性有機高分子凝集剤を必要とすることになる
と推察される。A similar phenomenon is thought to occur if a strong ionic organic polymer flocculant is added first and then an anionic organic polymer flocculant is added, but all particles with anionic surfaces are converted to cationic ones. It is estimated that a considerable amount of cationic organic polymer flocculant is required for this purpose. Therefore, it is presumed that in order to obtain a sufficient effect with such a method, an extremely large amount of cationic organic polymer flocculant is required.
実施例１
低希釈二段活性汚泥法で処理している、し尿処理場から
発生した余剰汚泥と凝集沈殿汚泥との混合汚泥（ｐＨ７
，１，、２９，１？／Ｉｆ）の凝集、脱水試験を行った
。Example 1 Mixed sludge (pH 7
,1,,29,1? /If) coagulation and dehydration tests were conducted.
凝集試験は５００ ｔｌｌｌのビー力とツヤ−テスタを
使用し、２種類の有機高分子凝集剤を使用する場合には
、最初の有機高分子凝集剤を添加後１５０ｒｐｍで攪拌
混合し、次の有機高分子凝集剤を添加後１００ ｒｐｍ
で混合攪拌した。The flocculation test uses a 500 tlll bee force and a gloss tester. When using two types of organic polymer flocculants, add the first organic polymer flocculant, stir and mix at 150 rpm, and add the next organic polymer flocculant. 100 rpm after adding polymer flocculant
The mixture was mixed and stirred.
また、１種類の有機高分子凝集剤を使用する場合には、
それを添加後１００ ｒｐｒｎで攪拌混合した。In addition, when using one type of organic polymer flocculant,
After addition, the mixture was stirred and mixed at 100 rprn.
これらの操作によって凝集した汚泥をブフナーロートの
上に注ぎ、３０秒彼のν液量を測定した。The sludge flocculated by these operations was poured onto a Buchner funnel, and the volume of liquid was measured for 30 seconds.
別に脱水試験をベルトプレス室内試験機で行って脱水後
のケーキ含水率と処理量を測定した。Separately, a dehydration test was conducted using a belt press indoor tester to measure the cake moisture content and throughput after dehydration.
本発明の方法ではアニオン性有機高分子凝集剤トシテ、
コロイドアニオン荷電量５．５ ｍｅｑ ／ ？ （７
）ぼりアクリルアミド加水分解変性物（以下ＰＡＭ−Ａ
と略称する）、カチオン性有機高分子凝集剤トシテコロ
イドカチオン荷電量４．２ ｍｅｑ ／ ？ （Ｄ Ｉ
リアルキルアミノメタクリレート（以下ＤＭ−Ａと略称
する）を使用した。比較として、コロイドアニオン荷電
量３．０ｍｅｑ／ｒのポリアクリルアミド部分加水分解
変性物（以下ＰＡＭ−Ｂと略称する）を添加・混合後、
ＤＭ−Ａを添加した場合とＤＭ−Ａを単独添加した場合
について行った。In the method of the present invention, an anionic organic polymer flocculant Toshite,
Colloidal anion charge amount 5.5 meq/? (7
) acrylamide hydrolyzed modified product (hereinafter referred to as PAM-A)
(abbreviated as ), cationic organic polymer flocculant Toshitecolloid cationic charge amount 4.2 meq/? (DI
Realkylaminomethacrylate (hereinafter abbreviated as DM-A) was used. For comparison, after adding and mixing a polyacrylamide partially hydrolyzed modified product (hereinafter abbreviated as PAM-B) with a colloidal anion charge amount of 3.0 meq/r,
Tests were conducted for the case where DM-A was added and the case where DM-A was added alone.
実験結果を第１表に示す。この表から、本発明による方
法は、濾過性が良く、ベルトプレスでの処理量が増加す
ることがわかる。The experimental results are shown in Table 1. From this table, it can be seen that the method according to the present invention has good filterability and increases the throughput in the belt press.
第 １ 表
実施例２
食品工場から発生した余剰汚泥と凝集沈殿汚泥（！：
）混合汚泥（ｐＨ６、５，１８，６９＃）ノ凝集試験と
ベルトプレスでの脱水試験を行った。Table 1 Example 2 Surplus sludge and coagulated sedimentation sludge (!:
) Mixed sludge (pH 6, 5, 18, 69#) flocculation test and belt press dewatering test were conducted.
本発明の方法では、アニオン性有機高分子凝集剤として
コロイドアニオン荷電量８．５ｍｅｑ／？のポリアクリ
ル酸ソーダ（以下ＰＡＮ−Ａと略称する）、カチオン性
有機高分子凝集剤としてコロイドカチオン荷電量４．５
ｍｅｑ ／ Ｓｉ’のポリアルキルアミノメタクリレ
ート（以下ＤＭ−Ｂと略称する）を使用した。In the method of the present invention, the colloidal anion charge amount as an anionic organic polymer flocculant is 8.5 meq/? Sodium polyacrylate (hereinafter abbreviated as PAN-A), colloidal cation charge amount 4.5 as a cationic organic polymer flocculant
meq/Si' polyalkylamino methacrylate (hereinafter abbreviated as DM-B) was used.
比較として、ＤＭ−Ｂ添加、混合後ＰＡＭ−Ａを添加し
た場合とＰＡＮ−Ａ添加後コロイドアニオン荷電量３．
５ｍｅｑ／？のポリアルキルアミノメタクリレート（以
下ＤＭ−Ｃと略称する）を添加した場合及びＤＭ−Ｂを
単独添加した場合について行った。As a comparison, the amount of colloidal anion charge after addition of DM-B and PAM-A after mixing and after addition of PAN-A is 3.
5meq/? The test was carried out for the case where polyalkylamino methacrylate (hereinafter abbreviated as DM-C) was added and the case where DM-B was added alone.
実験結果を第２表に示す。この表から本発明による方法
は、濾過性がよく、処理量が増加し、さらにケーキ含水
率が低下することがわかる。The experimental results are shown in Table 2. From this table, it can be seen that the method according to the present invention has good filtration performance, increases throughput, and further reduces cake moisture content.
第２表
実施例３
都市下水から発生した混合生汚泥と三次処理汚泥の混合
汚泥（ｐＨ６，７，２４，７？／ｌ ）の凝集試験と
ベルトプレスでの脱水試験を行った。Table 2 Example 3 A flocculation test and a belt press dewatering test were conducted on mixed sludge (pH 6, 7, 24, 7?/l) of mixed raw sludge and tertiary treated sludge generated from urban sewage.
本発明の方法では、アニオン性有機高分子凝集剤として
コロイドアニオン荷を量７．５ ｍｅｑ ／ ｆ’ （
７）？リアクリルアミド部分加水分解変性物（以下Ｐ’
ＡＭ−Ｂと略称する）、カチオン性有機高分子凝集剤と
してコロイドカチオン荷電量４．７ ｍｅｑ／Ｓ’のポ
リアルキルアミノメタクリレート（以下ＤＭ−りと略称
する）を使用した。比較として、ＤＭ−りを単独添加し
た場合について行った。In the method of the present invention, a colloidal anion charge is used as an anionic organic polymer flocculant in an amount of 7.5 meq/f' (
7)? Reacrylamide partially hydrolyzed modified product (hereinafter P'
A polyalkylamino methacrylate (hereinafter abbreviated as DM-RI) having a colloidal cation charge amount of 4.7 meq/S' was used as a cationic organic polymer flocculant (abbreviated as AM-B). For comparison, a case where DM-li was added alone was conducted.
実験結果を第３表に示す。この表から、本発明による方
法は、沖過性がよくペルトゲレスでの処理量が増加する
ことがわかる。The experimental results are shown in Table 3. From this table, it can be seen that the method according to the present invention has good offshore permeability and increases the throughput in Pertgeles.
第３表
発明の効果
本発明の方法すなわち凝集沈殿汚泥を含む有機性汚泥に
、コロイドアニオン荷Ｍ、 量５ 、Ｏｍｅｑ ／ ９
以上のアニオン性有機高分子凝集剤を添加して、攪拌混
合し、次いでコロイドカチオン荷電量４．０ｍｅｑ ／
ｆ’以上のカチオン性有機高分子凝集剤を添加するこ
とによって次のような効果・利点がある。Table 3 Effects of the Invention The method of the present invention, that is, the organic sludge containing coagulated sedimentation sludge contains colloidal anion load M, amount 5, Omeq/9
The above anionic organic polymer flocculant was added and mixed with stirring, and then the colloidal cation charge amount was 4.0 meq/
By adding a cationic organic polymer flocculant having f' or more, the following effects and advantages can be obtained.
（１）生成するフロックが、密度が高く強度が太きいの
でペルトゲレスや遠心分離機での処理量が増加する。(1) The generated flocs have high density and strength, so the throughput in a pellet gel or centrifuge increases.
（２）脱水ケーキの含水率が低下する。(2) The moisture content of the dehydrated cake decreases.
（３） ベルトプレスやフィルターゾレスの場合、剥
離性が良好で、固形物の回収率が高い。(3) In the case of a belt press or filter Sores, the peelability is good and the recovery rate of solids is high.
（４） アニオン性及びカチオン性の有機高分子凝集
剤の添加率を調節することによって、広い範囲の種類の
汚泥に適用することができる。(4) By adjusting the addition rate of anionic and cationic organic polymer flocculants, it can be applied to a wide range of types of sludge.
（５） アニオン性とカチオン性の有機高分子凝集剤
の添加率の許容範囲が広いため、安定して処理を行うこ
とができる。(5) Since there is a wide allowable range for the addition ratio of anionic and cationic organic polymer flocculants, stable processing can be performed.
Claims (1)
アニオン荷電量５．０ｍｅｑ／ｇ以上のアニオン性有機
高分子凝集剤を添加して攪拌混合し、次いでｐＨ４での
コロイドカチオン荷電量４．０ｍｅｑ／ｇ以上のカチオ
ン性有機高分子凝集剤を添加して脱水することを特徴と
する有機性汚泥の脱水方法。An anionic organic polymer flocculant having a colloidal anion charge amount of 5.0 meq/g or more at pH 4 is added to organic sludge containing coagulated sedimentation sludge, and the mixture is stirred, and then the colloidal cation charge amount at pH 4 is 4.0 meq. 1. A method for dewatering organic sludge, which comprises adding a cationic organic polymer flocculant of /g or more to dewater the organic sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59145613A JPS6125700A (en) | 1984-07-13 | 1984-07-13 | Dehydrating method of organic sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59145613A JPS6125700A (en) | 1984-07-13 | 1984-07-13 | Dehydrating method of organic sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6125700A true JPS6125700A (en) | 1986-02-04 |
Family
ID=15389080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59145613A Pending JPS6125700A (en) | 1984-07-13 | 1984-07-13 | Dehydrating method of organic sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6125700A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01310800A (en) * | 1988-06-10 | 1989-12-14 | Aoki Corp | Sludge flocculation method |
| JPH10128010A (en) * | 1996-11-05 | 1998-05-19 | Hymo Corp | Treatment of dredge mud |
| JPH1133600A (en) * | 1997-05-21 | 1999-02-09 | Hymo Corp | Method for dewatering construction aggregate washing sludge |
| JP2008114142A (en) * | 2006-11-02 | 2008-05-22 | Shimizu Corp | Slurry dewatering method and apparatus, and suspension treatment system |
| JP2009039652A (en) * | 2007-08-09 | 2009-02-26 | Hymo Corp | Sludge dewatering agent and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5732797A (en) * | 1980-08-08 | 1982-02-22 | Kurita Water Ind Ltd | Sludge dehydration method |
| JPS57127500A (en) * | 1981-01-28 | 1982-08-07 | Kurita Water Ind Ltd | Flocculation treatment for sludge |
| JPS57130600A (en) * | 1981-02-07 | 1982-08-13 | Kurita Water Ind Ltd | Dehydration of sludge |
| JPS57135096A (en) * | 1981-02-12 | 1982-08-20 | Kurita Water Ind Ltd | Sludge dewatering method |
-
1984
- 1984-07-13 JP JP59145613A patent/JPS6125700A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5732797A (en) * | 1980-08-08 | 1982-02-22 | Kurita Water Ind Ltd | Sludge dehydration method |
| JPS57127500A (en) * | 1981-01-28 | 1982-08-07 | Kurita Water Ind Ltd | Flocculation treatment for sludge |
| JPS57130600A (en) * | 1981-02-07 | 1982-08-13 | Kurita Water Ind Ltd | Dehydration of sludge |
| JPS57135096A (en) * | 1981-02-12 | 1982-08-20 | Kurita Water Ind Ltd | Sludge dewatering method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01310800A (en) * | 1988-06-10 | 1989-12-14 | Aoki Corp | Sludge flocculation method |
| JPH10128010A (en) * | 1996-11-05 | 1998-05-19 | Hymo Corp | Treatment of dredge mud |
| JPH1133600A (en) * | 1997-05-21 | 1999-02-09 | Hymo Corp | Method for dewatering construction aggregate washing sludge |
| JP2008114142A (en) * | 2006-11-02 | 2008-05-22 | Shimizu Corp | Slurry dewatering method and apparatus, and suspension treatment system |
| JP2009039652A (en) * | 2007-08-09 | 2009-02-26 | Hymo Corp | Sludge dewatering agent and method |
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