JP2013086013A - Processing method for white water in papermaking - Google Patents
Processing method for white water in papermaking Download PDFInfo
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- JP2013086013A JP2013086013A JP2011228011A JP2011228011A JP2013086013A JP 2013086013 A JP2013086013 A JP 2013086013A JP 2011228011 A JP2011228011 A JP 2011228011A JP 2011228011 A JP2011228011 A JP 2011228011A JP 2013086013 A JP2013086013 A JP 2013086013A
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- flocculant
- polymer flocculant
- white water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000003672 processing method Methods 0.000 title claims abstract description 7
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 19
- 229920006318 anionic polymer Polymers 0.000 claims abstract description 16
- 239000000178 monomer Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 18
- 229920000642 polymer Polymers 0.000 claims description 18
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 10
- 125000000129 anionic group Chemical group 0.000 claims description 9
- 150000003839 salts Chemical group 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 7
- -1 dimethylaminoethyl Chemical group 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 125000002947 alkylene group Chemical group 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 150000001450 anions Chemical group 0.000 claims description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 2
- 150000001768 cations Chemical group 0.000 claims description 2
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 2
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 2
- 239000000701 coagulant Substances 0.000 abstract 4
- 239000006228 supernatant Substances 0.000 description 5
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 229920003169 water-soluble polymer Polymers 0.000 description 4
- KCXMKQUNVWSEMD-UHFFFAOYSA-N benzyl chloride Chemical compound ClCC1=CC=CC=C1 KCXMKQUNVWSEMD-UHFFFAOYSA-N 0.000 description 3
- 229940073608 benzyl chloride Drugs 0.000 description 3
- 125000004985 dialkyl amino alkyl group Chemical group 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229940050176 methyl chloride Drugs 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 241000533901 Narcissus papyraceus Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- MZVQCMJNVPIDEA-UHFFFAOYSA-N [CH2]CN(CC)CC Chemical group [CH2]CN(CC)CC MZVQCMJNVPIDEA-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Paper (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
本発明は、製紙白水の処理方法に関し、詳しくは、製紙工場で抄紙工程から排出される白水に凝集剤を添加する、製紙白水の処理方法に関する。 The present invention relates to a papermaking whitewater treatment method, and more particularly to a papermaking whitewater treatment method in which a flocculant is added to whitewater discharged from a papermaking process in a papermaking factory.
白水には、填料として使用された各種の成分が有価成分として含まれている。それで、従来より、白水に各種の凝集剤を添加し、白水中の有価成分を凝集させて回収する方法が提案されている。例えば、特定組成のアクリル系カチオン性水溶性高分子を使用する方法（特許文献１）、特定構造のカチオン性水溶性高分子を使用する方法（特許文献２）、特定構造のカチオン性水溶性高分子と組み合せてカチオン性水溶性高分子を使用する方法（特許文献３）が提案されている。 White water contains various components used as fillers as valuable components. Therefore, conventionally, a method has been proposed in which various flocculants are added to white water to aggregate and recover valuable components in the white water. For example, a method using an acrylic cationic water-soluble polymer having a specific composition (Patent Document 1), a method using a cationic water-soluble polymer having a specific structure (Patent Document 2), a cationic water-soluble polymer having a specific structure A method of using a cationic water-soluble polymer in combination with a molecule (Patent Document 3) has been proposed.
ところで、凝集性能は、フロック径、沈降性、上澄液濁などによって評価されるが、特に、上澄液濁は、有価成分の回収率および白水の清浄化（再利用）の指標として重要である。 By the way, the agglomeration performance is evaluated by the floc diameter, the sedimentation property, the supernatant turbidity, etc. In particular, the supernatant turbidity is important as an index for recovering valuable components and cleaning (reusing) white water. is there.
ところが、従来の方法では、凝集物生成後の上澄液濁度が必ずしも十分ではなく、有価成分の回収率および白水の清浄化（再利用）の点で満足のいくものではない。本発明は、上記実情に鑑みなされたものであり、その目的は、白水中の有価成分を回収すると共に白水を清浄化して再利用することが出来る、製紙白水の処理方法を提供することにある。 However, in the conventional method, the turbidity of the supernatant after the formation of aggregates is not always sufficient, and it is not satisfactory in terms of recovery of valuable components and purification (reuse) of white water. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a papermaking whitewater treatment method capable of recovering valuable components in whitewater and purifying and reusing whitewater. .
本発明者は、上記の目的を達成すべく鋭意検討した結果、白水の凝集処理後の上澄液濁は、凝集剤の添加順序を含む特定の添加態様によって著しく影響されるとの知見を得た。 As a result of intensive studies to achieve the above object, the present inventor obtained knowledge that the turbidity of the supernatant after the flocculation treatment of white water is significantly affected by a specific addition mode including the addition order of the flocculating agent. It was.
本発明は、上記の知見を基に更に検討を重ねた結果完成されたものであり、その要旨は、製紙白水に凝集剤を添加し、凝集物を生成させて分離する製紙白水の処理方法であって、最初にカチオン性高分子凝集剤（Ａ）を添加し、次いで、アニオン性高分子凝集剤（Ｂ）を添加し、更に、カチオン性高分子凝集剤（Ａ）を添加することを特徴とする製紙白水の処理方法に存する。 The present invention has been completed as a result of further studies based on the above findings, and the gist of the present invention is a processing method for papermaking white water in which a flocculant is added to papermaking whitewater, and aggregates are generated and separated. First, the cationic polymer flocculant (A) is added, then the anionic polymer flocculant (B) is added, and the cationic polymer flocculant (A) is further added. The papermaking white water treatment method.
本発明の処理方法によれば、前記の課題が達成されるが、近年の高級紙志向により、炭酸カルシウムに代えてタルクやクレイと言った高級填料が使用されている状況下にあって、本発明の工業的価値は顕著である。 According to the treatment method of the present invention, the above-mentioned problems are achieved, but in the situation where high-grade fillers such as talc and clay are used instead of calcium carbonate due to recent high-quality paper orientation, The industrial value of the invention is significant.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
先ず、本発明で対象となる製紙白水について説明する。製紙白水は、製紙工場の抄紙工程から排出され、填料として使用された各種の成分（タルクやクレイ等）を有価成分として含んでいる。本発明は、ｐＨ値やＳＳ分などが異なる各種の製紙白水に適用し得る。 First, the papermaking white water that is the subject of the present invention will be described. Papermaking white water contains various components (such as talc and clay) discharged from the papermaking process of the paper mill and used as fillers as valuable components. The present invention can be applied to various types of papermaking white water having different pH values and SS contents.
次に、本発明で使用する凝集剤について説明する。本発明の特徴は、カチオン性高分子凝集剤とアニオン性高分子凝集剤とを特定の態様で添加する点にあり、凝集剤の種類は必ずしも限定されず、従来公知の凝集剤の中から適宜選択し得るが、特に以下の凝集剤が推奨される。 Next, the flocculant used in the present invention will be described. The feature of the present invention is that the cationic polymer flocculant and the anionic polymer flocculant are added in a specific manner, and the kind of the flocculant is not necessarily limited, and is appropriately selected from conventionally known flocculants. In particular, the following flocculants are recommended:
カチオン性高分子凝集剤（Ａ）：
下記一般式（１）で表されるカチオン性単量体を構造単位として含む重合体、または当該カチオン性単量体と下記一般式（２）で表されるノニオン性単量体を構造単位として含む重合体。
Cationic polymer flocculant (A):
A polymer containing a cationic monomer represented by the following general formula (1) as a structural unit, or a nonionic monomer represented by the cationic monomer and the following general formula (2) as a structural unit Containing polymer.
アニオン性高分子凝集剤（Ｂ）：
下記一般式（３）で表されるアニオン性単量体を構造単位として含む重合体、または当該アニオン性単量体と下記一般式（２）で表されるノニオン性単量体を構造単位として含む重合体。
Anionic polymer flocculant (B):
A polymer containing an anionic monomer represented by the following general formula (3) as a structural unit, or a nonionic monomer represented by the anionic monomer and the following general formula (2) as a structural unit Containing polymer.
［式（１）中、Ｘは酸素原子またはＮＨを示し、Ｙは炭素数１〜１０の直鎖状または分岐状のアルキレン基を示し、Ｒ１は水素原子またはメチル基を示し、Ｒ２およびＲ３は各々同一または異なって、水素原子、炭素数１〜１２の直鎖状または分岐状のアルキル基、シクロアルキル基、フェニル基、置換フェニル基、またはベンジル基を示し、Ｒ４は水素原子または炭素数１〜１２の直鎖状または分岐状のアルキレン基を示し、Ｚ−はアニオン基を示す。式（２）中、Ｒ５は水素原子またはメチル基を示す。式（３）中、Ｒ６は水素原子またはメチル基を示し、Ａは水素原子またはカチオン基を示す。］ [In the formula (1), X represents an oxygen atom or NH, Y represents a linear or branched alkylene group having 1 to 10 carbon atoms, R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 is the same or different and represents a hydrogen atom, a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, a phenyl group, a substituted phenyl group, or a benzyl group, and R 4 represents a hydrogen atom. Or a C1-C12 linear or branched alkylene group is shown, Z- shows an anion group. In formula (2), R 5 represents a hydrogen atom or a methyl group. In formula (3), R 6 represents a hydrogen atom or a methyl group, and A represents a hydrogen atom or a cation group. ]
一般式（１）で表されるカチオン性単量体の代表例としては、ジアルキルアミノアルキル（メタ）アクリレート系カチオン性単量体などが挙げられ、具体的には、ジメチルアミノエチル（メタ）アクリレート、ジエチルアミノエチル（メタ）アクリレート及びジエチルアミノ−２−ヒドロキシプロピル（メタ）アクリレート等のジアルキルアミノアルキル（メタ）アクリレートの塩酸塩や硫酸塩などの３級塩；ジアルキルアミノアルキル（メタ）アクリレートの塩化メチル付加物などのハロゲン化アルキル付加物や塩化ベンジル等のハロゲン化アリール付加物などの４級塩などが挙げられる。また、ジメチルアミノプロピル（メタ）アクリルアミド等のジアルキルアミノプロピル（メタ）アクリルアミド等の塩酸塩や硫酸塩などの３級塩；ジアルキルアミノプロピル（メタ）アクリルアミドの塩化メチル付加物などのハロゲン化アルキル付加物や塩化ベンジル付加物などのハロゲン化アリール付加物などの４級塩も挙げられる。これらの中では、ジメチルアミノエチル（メタ）アクリレート４級塩が好ましい。 Representative examples of the cationic monomer represented by the general formula (1) include dialkylaminoalkyl (meth) acrylate cationic monomers, and specifically, dimethylaminoethyl (meth) acrylate. , Tertiary salts such as hydrochlorides and sulfates of dialkylaminoalkyl (meth) acrylates such as diethylaminoethyl (meth) acrylate and diethylamino-2-hydroxypropyl (meth) acrylate; methyl chloride addition of dialkylaminoalkyl (meth) acrylates And quaternary salts such as halogenated alkyl adducts such as benzyl chloride and halogenated aryl adducts such as benzyl chloride. Also, tertiary salts such as hydrochloride and sulfate such as dialkylaminopropyl (meth) acrylamide such as dimethylaminopropyl (meth) acrylamide; alkyl halide adducts such as methyl chloride adduct of dialkylaminopropyl (meth) acrylamide And quaternary salts such as halogenated aryl adducts such as benzyl chloride adduct and the like. Among these, dimethylaminoethyl (meth) acrylate quaternary salt is preferable.
一般式（２）で表されるノニオン性単量体としては、アクリルアミド又はメタクリルアミドが挙げられが、特に、アクリルアミドが好ましい。 Examples of the nonionic monomer represented by the general formula (2) include acrylamide and methacrylamide, and acrylamide is particularly preferable.
カチオン性高分子凝集剤（Ａ）がカチオン性単量体とノニオン性単量体とを構造単位として含む重合体である場合、両者の重比率は、通常、カチオン性単量体／ノニオン性単量体＝１０／９０〜９０／１０であり、好ましくは２０／８０〜７０／３０である。 When the cationic polymer flocculant (A) is a polymer containing a cationic monomer and a nonionic monomer as structural units, the weight ratio of the two is usually cationic monomer / nonionic monomer. The mer = 10/90 to 90/10, preferably 20/80 to 70/30.
アニオン性高分子凝集剤（Ｂ）は、前記一般式（３）で表されるアニオン性単量体を構造単位として含む重合体、または当該アニオン性単量体と前記一般式（２）で表されるノニオン性単量体を構造単位として含む重合体である。 The anionic polymer flocculant (B) is a polymer containing the anionic monomer represented by the general formula (3) as a structural unit, or the anionic monomer and the general formula (2). It is a polymer containing a nonionic monomer as a structural unit.
一般式（３）で表されるアニオン性単量体としては、アクリル酸、メタクリル酸、これらの塩が挙げられるが、特に、メタクリル酸および／またはその塩が好ましい。 Examples of the anionic monomer represented by the general formula (3) include acrylic acid, methacrylic acid, and salts thereof, and methacrylic acid and / or a salt thereof are particularly preferable.
アニオン性高分子凝集剤（Ｂ）がアニオン性単量体とノニオン性単量体を構造単位として含む重合体である場合、両者の重比率は、通常、アニオン性単量体／ノニオン性単量体＝１０／９０〜７０／３０であり、好ましくは２０／８０〜６０／４０である。 When the anionic polymer flocculant (B) is a polymer containing an anionic monomer and a nonionic monomer as structural units, the weight ratio of the two is usually anionic monomer / nonionic monomer Body = 10/90 to 70/30, preferably 20/80 to 60/40.
カチオン性高分子凝集剤（Ａ）及びアニオン性高分子凝集剤（Ｂ）は、何れも、実質的に公知の重合体であり、従って、公知の重合法で容易に得ることが出来る。カチオン性高分子凝集剤（Ａ）の重量平均分子量は、通常１００万〜１０００万、好ましくは３００万〜８００万である。アニオン性高分子凝集剤（Ｂ）の重量平均分子量は、通常５００万〜２０００万、好ましくは８００万〜１６００万である。 The cationic polymer flocculant (A) and the anionic polymer flocculant (B) are both substantially known polymers, and therefore can be easily obtained by a known polymerization method. The weight average molecular weight of the cationic polymer flocculant (A) is usually 1 million to 10 million, preferably 3 million to 8 million. The weight average molecular weight of the anionic polymer flocculant (B) is usually 5 million to 20 million, preferably 8 million to 16 million.
本発明においては、製紙白水に凝集剤を添加するに際し、最初にカチオン性高分子凝集剤（Ａ）を添加し、次いで、アニオン性高分子凝集剤（Ｂ）を添加し、更に、カチオン性高分子凝集剤（Ａ）を添加することが重要である。 In the present invention, when adding the flocculant to papermaking white water, first the cationic polymer flocculant (A) is added, then the anionic polymer flocculant (B) is added, It is important to add the molecular flocculant (A).
上記の多段添加の方法としては、複数槽設置し、各凝集剤をそれぞれ別々の槽に添加して機械攪拌する方法、同一の槽に添加位置をずらして添加して機械攪拌する方法、廃水ラインに添加してライン混合する場合は位置をずらして添加する方法などが考えられる。 As the above multi-stage addition method, a plurality of tanks are installed, each flocculant is added to a separate tank and mechanically stirred, the addition position is shifted to the same tank and mechanically stirred, a waste water line In the case of adding to the mixture and mixing the lines, a method of adding by shifting the position can be considered.
凝集剤の添加量は、白水の種類、ＳＳ、濁度等の水質により変動するが、カチオン性高分子凝集剤（Ａ）の添加量は、通常０．１〜１０ｐｐｍ、好ましくは１〜３ｐｐｍ、アニオン性高分子凝集剤（Ｂ）の添加量は、通常０．１〜１０ｐｐｍ、好ましくは１〜３ｐｐｍである。また、多段添加の際の間隔（攪拌混合時間）は例えば３０秒〜５分程度である。生成した凝集の分離は、常法に従って、浮上処理、沈殿処理、ろ過処理の等の方法で行うことが出来る。 The addition amount of the flocculant varies depending on the type of white water, SS, water quality such as turbidity, but the addition amount of the cationic polymer flocculant (A) is usually 0.1 to 10 ppm, preferably 1 to 3 ppm, The addition amount of the anionic polymer flocculant (B) is usually 0.1 to 10 ppm, preferably 1 to 3 ppm. Moreover, the interval (stirring mixing time) at the time of multistage addition is about 30 seconds to 5 minutes, for example. Separation of the produced agglomerates can be performed by methods such as flotation treatment, precipitation treatment, and filtration treatment according to a conventional method.
以下、本発明を実施例および比較例によって更に詳細に説明するが、本発明は、その要旨を超えない限り、以下の実施例に何ら限定されるものではない。なお、以下の諸例において採用した各測定方法は次の通りである。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to a following example at all unless the summary is exceeded. In addition, each measuring method employ | adopted in the following examples is as follows.
（１）フロック径：
凝集フロックのフロック径は、目視により全体の平均を測定した。
(1) Flock diameter:
The average floc diameter of the aggregated floc was measured visually.
（２）沈降時間：
高分子凝集剤の所定量を添加し、所定時間攪拌混合した後に攪拌を停止する。そして、生成した凝集フロックが５００ｍｌのビーカーの底に沈降する迄の時間を測定した。
(2) Settling time:
A predetermined amount of the polymer flocculant is added, and after stirring for a predetermined time, stirring is stopped. And the time until the produced | generated aggregation floc settles in the bottom of a 500 ml beaker was measured.
（３）上澄液濁度（ＳＳ）：
濁度は、ＪＩＳ Ｋ ０１０１に基づき測定した。
(3) Supernatant turbidity (SS):
Turbidity was measured based on JIS K 0101.
なお、ＳＳは、フロック粒径、沈降時間を測定した後、２分間静置し、表面から３cmの深さより処理水を採取して測定した。 SS was measured by measuring the floc particle size and settling time, and then allowing to stand for 2 minutes, and collecting treated water from a depth of 3 cm from the surface.
実施例１：
製紙白水として、ｐＨ６．９の高灰分白水を使用した。カチオン性高分子凝集剤（Ａ）及びアニオン性高分子凝集剤（Ｂ）として、表１に記載のものを使用した。
Example 1:
High ash white water having a pH of 6.9 was used as the paper white water. As the cationic polymer flocculant (A) and the anionic polymer flocculant (B), those shown in Table 1 were used.
先ず、ビーカーに白水５００ｍｌを採取し、カチオン性高分子凝集剤（Ａ）１ｐｐｍを添加し、１５０ｒｐｍの回転数で１分間攪拌、混合した。次いで、アニオン性高分子凝集剤（Ｂ）１．５ｐｐｍを添加し、上記と同様に攪拌、混合し、更に、カチオン性高分子凝集剤（Ａ）１ｐｐｍを添加し、上記と同様に攪拌、混合した。そして、前記の各項目（１）〜（３）測定し、その結果を表２に示す。 First, 500 ml of white water was collected in a beaker, 1 ppm of a cationic polymer flocculant (A) was added, and the mixture was stirred and mixed for 1 minute at a rotation speed of 150 rpm. Next, 1.5 ppm of the anionic polymer flocculant (B) is added and stirred and mixed in the same manner as above, and further 1 ppm of the cationic polymer flocculant (A) is added and stirred and mixed in the same manner as above. did. And each said item (1)-(3) was measured, and the result is shown in Table 2.
実施例２〜１３及び比較例１〜３：
実施例１において、第１段凝集剤、第２段凝集剤、第３段凝集剤の種類と添加量を表２に示すように変更したこと以外は、実施例１と同様に行った。
Examples 2-13 and Comparative Examples 1-3:
In Example 1, it carried out like Example 1 except having changed the kind and addition amount of the 1st stage flocculant, the 2nd stage flocculant, and the 3rd stage flocculant as shown in Table 2.
Claims (3)
カチオン性高分子凝集剤（Ａ）：
下記一般式（１）で表されるカチオン性単量体を構造単位として含む重合体、または当該カチオン性単量体と下記一般式（２）で表されるノニオン性単量体を構造単位として含む重合体。
アニオン性高分子凝集剤（Ｂ）：
下記一般式（３）で表されるアニオン性単量体を構造単位として含む重合体、または当該アニオン性単量体と下記一般式（２）で表されるノニオン性単量体を構造単位として含む重合体。
Cationic polymer flocculant (A):
A polymer containing a cationic monomer represented by the following general formula (1) as a structural unit, or a nonionic monomer represented by the cationic monomer and the following general formula (2) as a structural unit Containing polymer.
Anionic polymer flocculant (B):
A polymer containing an anionic monomer represented by the following general formula (3) as a structural unit, or a nonionic monomer represented by the anionic monomer and the following general formula (2) as a structural unit Containing polymer.
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