JP5258639B2 - 汚泥の脱水方法 - Google Patents
汚泥の脱水方法 Download PDFInfo
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- JP5258639B2 JP5258639B2 JP2009062243A JP2009062243A JP5258639B2 JP 5258639 B2 JP5258639 B2 JP 5258639B2 JP 2009062243 A JP2009062243 A JP 2009062243A JP 2009062243 A JP2009062243 A JP 2009062243A JP 5258639 B2 JP5258639 B2 JP 5258639B2
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Description
(A)単量体は同種であり共重合比も同様だが、分子量の異なる場合。
(B)単量体は同種だが共重合比が異なり、分子量も異なる場合。
(C)単量体は異種であり分子量も異なる場合。
R1は水素又はメチル基、R2、R3は炭素数1〜3のアルキル基、アルコキシ基あるいはベンジル基、R4は水素、炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基であり、同種でも異種でも良い。Aは酸素またはNH、Bは炭素数2〜4のアルキレン基またはアルコキシレン基、X1は陰イオンをそれぞれ表わす。
R5は水素又はメチル基、R6、R7は炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基、X2は陰イオンをそれぞれ表わす。
式中R8,R9は水素原子またはメチル基を、X3 - は陰イオンを表わす。
R8は水素またはCH2COOY2、QはSO3、C6H5SO3、
CONHC(CH3)2CH2SO3、C6H5COOあるいはCOO、R9は水素、メチル基またはCOOY2であり、Y1、Y2は水素または陽イオンをそれぞれ表わす。
(A)単量体は同種であり共重合比も同様だが、分子量の異なる場合
(B)単量体は同種だが共重合比が異なり、分子量も異なる場合
(C)単量体は異種であり分子量も異なる場合
すなわち既存の溶解液と追加する高分子凝集剤は、異なるものを使用したほうが効果は発揮され易い。例えば既に溶解して使用している高分子凝集剤よりも高分子量の高分子凝集剤を追加し脱水状態を向上させる場合(Aの場合)、あるいはアニオン性に帯電した成分が多く、最初主にこれらアニオン性成分を中和し、その後架橋吸着作用による大型フロックを生成させるため、溶解液は中分子量、高カチオン性を使用し、追加高分子凝集剤は、高分子量、中カチオン性を使用する(Bの場合)、あるいは数段汚泥脱水性能を向上したい(Cの場合)などの処方が検討できる。
ョンを形成させ重合したエマルジョンは、このままで水となじむので転相剤を添
加する必用がない。これら界面活性剤のHLBは、9〜20のもの、好ましくは
11〜20のものを使用する。そのような界面活性剤の例としては、カチオン性
界面活性剤やHLB9〜15のノニオン性界面活性剤であり、ポリオキシエチレ
ンポリオキシプロピレンアルキルエ−テル系、ポリオキシエチレンアルコールエ
−テル系などである。
ス(アミジノプロパン)二塩化水素化物または2、2’−アゾビス〔2−(5−
メチル−2−イミダゾリン−2−イル)プロパン〕二塩化水素化物のような水溶
性アゾ系重合開始剤、あるいは過硫酸アンモニウムおよび亜硫酸水素ナトリウム
併用のような水溶性レドックス系重合開始剤を添加し、撹拌下ラジカル重合を行
う。
R1は水素又はメチル基、R2、R3は炭素数1〜3のアルキル基、アルコキシ基あるいはベンジル基、R4は水素、炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基であり、同種でも異種でも良い。Aは酸素またはNH、Bは炭素数2〜4のアルキレン基またはアルコキシレン基、X1は陰イオンをそれぞれ表わす。
R5は水素又はメチル基、R6、R7は炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基、X2は陰イオンをそれぞれ表わす。
R8は水素またはCH2COOY2、QはSO3、C6H5SO3、
CONHC(CH3)2CH2SO3、C6H5COOあるいはCOO、R9は水素、メチル基またはCOOY2であり、Y1、Y2は水素または陽イオンをそれぞれ表わす。
これを油溶性高分子OS−1とする。
DMQ:アクリロイルオキシエチルトリメチルアンモニウム塩化物
DMC:メタクリロイルオキシエチルトリメチルアンモニウム塩化物
AM:アクリルアミド、AC:アクリル酸、
MBA:メチレンビスアクリルアミド(単量体総量に対する質量割合)
すなわち対SS添加量を15%増しの1.58質量%で汚泥に添加し、脱水効果をみた。18.0m3/hrで上記汚泥を攪拌機の付いた凝集混和槽に供給し、S−1を1990L/hr(対汚泥SS分1.58質量%)で上記汚泥を攪拌機の付いた凝集混和槽に供給し、攪拌、汚泥の凝集を行い、その後この凝集汚泥を圧入式外筒回転型スクリュープレスに移送し、排出した脱水汚泥に関して、脱離水中のSS分(懸濁粒子濃度;mg/L)及びケーキ含水率を測定した。結果を表2に示す。
ケーキ含水率:質量%、添加量:対ss質量%
上記汚泥を用い、分散液タイプ高分子凝集剤製品原液EM−1の追加なしで、対SS添加量を実施例1と同じにしてS−2単独の効果を試験した。すなわち対SS添加量を10%増しの1.32質量%で汚泥に添加し、脱水効果をみた。7.5m3/hrで上記汚泥を攪拌機の付いた凝集混和槽に供給し、S−2を1120L/hr(対汚泥SS分1.32質量%)で上記汚泥を攪拌機の付いた凝集混和槽に供給し、攪拌、汚泥の凝集を行い、その後この凝集汚泥を圧入式外筒回転型スクリュープレスに移送し、排出した脱水汚泥に関して、脱離水中のSS分(懸濁粒子濃度;mg/L)及びケーキ含水率を測定した。結果を表2に示す。
ケーキ含水率:質量%、添加量:対ss質量%
Claims (6)
- 汚泥脱水処理工程において、高分子凝集剤溶解槽と汚泥凝集混和槽のあいだの配管中に前記溶解槽から溶解液を送液しつつ、分散液タイプ高分子凝集剤製品原液を前記配管中の前記溶解液に添加し、前記溶解液と前記分散液タイプ高分子凝集剤製品原液の混合物を汚泥凝集混和槽に供給し、混合・攪拌した後、脱水機により脱水することを特徴とする汚泥の脱水方法。
- 前記溶解槽に溶解液が貯蔵される高分子凝集剤の化学組成と、追加添加する前記分散液タイプ高分子凝集剤の化学組成が下記(A)〜(C)から選択される一つの組み合わせ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。
(A)単量体は同種であり共重合比も同様だが、分子量の異なる場合
(B)単量体は同種だが共重合比が異なり、分子量も異なる場合
(C)単量体は異種であり分子量も異なる場合 - 前記高分子凝集剤溶解液および前記分散液タイプ高分子凝集剤製品原液の化学組成が、下記一般式(1)及び/又は(2)で表される水溶性単量体を必須とし、下記一般式(7)で表される水溶性単量体を適宜添加する単量体混合物の重合体、下記一般式(4)及び/又は(5)で表される構造単位を有するアミジン系水溶性高分子、下記一般式(6)で表される構造単位を有するビニルアミン系水溶性高分子から選択される一種であることを特徴とする請求項1あるいは2に記載の汚泥の脱水方法。
R1は水素又はメチル基、R2、R3は炭素数1〜3のアルキル基、アルコキシ基あるいはベンジル基、R4は水素、炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基であり、同種でも異種でも良い。Aは酸素またはNH、Bは炭素数2〜4のアルキレン基またはアルコキシレン基、X1は陰イオンをそれぞれ表わす。
R5は水素又はメチル基、R6、R7は炭素数1〜3のアルキル基、アルコキシル基あるいはベンジル基、X2は陰イオンをそれぞれ表わす。
R11は水素またはCH2COOY2、QはSO3、C6H5SO3、
CONHC(CH3)2CH2SO3、C6H5COOあるいはCOO、R12は水素、メチル基またはCOOY2であり、Y1、Y2は水素または陽イオンをそれぞれ表わす。 - 前記配管中に添加する分散液タイプ高分子凝集剤の製品形態が、油中水型エマルジョンあるいは塩水中デイスパージョンであることを特徴とする請求項1〜3のいずれかに記載の汚泥の脱水方法。
- 前記油中水型エマルジョンに疎水性単量体と、カチオン性単量体、アニオン性単量体、およびポリオキシエチレン鎖を有する単量体から選択される一種との共重合物からなる油溶性高分子を配合することを特徴とする請求項4に記載の汚泥の脱水方法。
- 前記脱水機がスクリュープレスあるいは回転式圧縮濾過機であることを特徴とする請求項1〜5のいずれかに記載の汚泥の脱水方法。
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