JP2004154726A - Flocculant for waste water treatment - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、特に難沈降性物質を含む排水を高度処理する際に好適な排出処理用凝集剤に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
凝集剤を用いて排水処理する場合、懸濁粒子群を効率良く凝集させるためには、凝集剤を懸濁液内に均一に混入させた後、急速攪拌してマイクロフロック群を形成させる処理と、緩速攪拌してマイクロフロック群や微粒子群を衝突・集合させる処理を併用することが知られている。（凝集工学−基礎と応用−；日本粉体工業技術協会編）
一般に使用されている凝集剤としては、硫酸アルミニウム、ポリ塩化アルミニウム、塩化鉄等に代表される無機凝集剤と、ポリアクリルアミド等に代表される水溶性高分子凝集剤がある。無機凝集剤は、正電荷を有する水酸化物により凝集が起こりやすくなり、高分子凝集剤は、接触する粒子群同士を架橋作用により集合させ、凝集体群を形成させるため、現在では、無機凝集剤と高分子凝集剤が併用されることが多い。
【０００３】
そして、無機凝集剤と高分子凝集剤を併用する場合にも、上記したとおり、無機凝集剤を添加した後に急速攪拌してマイクロフロック群を形成させ、高分子凝集剤を添加した後、緩速攪拌してより大きな凝集体群を形成させる処理方法が適用されている。
【０００４】
特許第１６８２２５号公報には、界面活性剤、油分等を含む排水に、ベントナイト、カチオン系高分子凝集剤を添加して得られる処理水を混和槽に導き、アルミニウム塩、アルカリ剤を添加して凝集反応を行った後、沈殿池で凝集フロックを分離する方法が開示されている。しかし、時間差を設けて、無機凝集剤や高分子凝集剤等の凝集剤を別々に投入する必要があるため、手間が掛かり、複数の凝集剤投入手段が必要となるほか、設備面積が大きくなり、装置が大きくなるという不利益もある。
【０００５】
２００１年６月２６日付の化学工業日報には、ベントナイト、植物抽出エキスを主成分としたＡ剤と、硫酸アルミニウム、デンプン誘導体カチオン性アクリルアミド重合物を主成分としたＢ剤とからなる排水処理剤〔（有）ウエステックから販売されている商品名ウエスタック〕が紹介されている。しかし、この排水処理剤は、水性塗料廃液に対して、まず粉末状のＡ剤を投入し、次いでＢ剤を水で溶解させた液体を添加する必要があるため、上記特許発明と同様に、設備面積が大きくなること、凝集剤の投入手段が複数必要となるという問題がある。
【０００６】
特開平９−２２５２０８号公報では、予めベントナイト等の吸着物質、炭酸塩、硫酸塩及び高分子凝集剤が所定割合で混合された混合凝集剤が開示されている。この技術は、設備面積や凝集剤の投入手段が複数必要となるとの問題は解決されるものの、同時に複数種類の凝集剤が投入されるため、高分子凝集剤がベントナイト等の吸着物質に吸着される場合があり、吸着物質による汚染物質の吸着除去効果が低下する恐れがある。
【０００７】
本発明は、上記問題を解決すると共に、特に難沈降性物質を含む排水を高度処理する際に好適な排出処理用凝集剤を提供することを課題とする。
【０００８】
【課題を解決するための手段】
本発明者は、凝集成分として特定成分の組み合わせを採用すること、好ましくは特定の凝集成分の組み合わせを採用すると共に、凝集成分の粒子径比率を特定したり、凝集成分の配合割合を所定範囲に調整したりすることにより、上記課題を解決できることを見出したものである。
【０００９】
請求項１に係る発明は、課題の解決手段として、無機凝集成分としてベントナイト、硫酸アルミニウムを含有し、高分子凝集成分としてアルギン酸ナトリウム、カチオン性ポリアクリルアミドを含有する排水処理用凝集剤であり、前記カチオン性ポリアクリルアミドが、アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体である排水処理用凝集剤を提供するものである。
【００１０】
本発明の排水処理用凝集剤は、全体として一つのものであり、成分ごとに分割して使用するものではないが、全体を複数に分割して使用しても良い。
【００１１】
【発明の実施の形態】
本発明の排水処理用凝集剤は、無機凝集成分としてベントナイト（モンモリロナイト）、硫酸アルミニウムを含有し、高分子凝集成分としてアルギン酸ナトリウム、カチオン性ポリアクリルアミド（アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体）を含有している。本発明では、これら以外の凝集成分の併用を妨げるものではないが、本発明の課題を解決する観点からは、他の凝集成分の併用は不要である。
【００１２】
これらの無機及び高分子凝集成分中、各成分は下記のとおりの作用をなすものであり、これらの作用が相互に関連して、本発明の課題が解決されるものである。
【００１３】
ベントナイトは、単独では排水をアルカリ性にするもので、界面活性剤によりエマルション化された油分の吸着を行って、溶液粘度（排水の粘度）を低下させるように作用する。
【００１４】
硫酸アルミニウムは、単独では排水を酸性にするものであるため、ベントナイトの添加によりアルカリ性となった排水を中和して、フロックの生成を促進するように作用する。
【００１５】
アルギン酸ナトリウムは、油分を吸着したベントナイトのマイクロフロック化を行うと共に、より大きなフロックを生成させ、生成したフロックを更に巨大化するように作用する。
【００１６】
カチオン性ポリアクリルアミド（アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体）は、架橋作用によりフロック同士を連結・集合させることで、フロックの巨大化を促進すると共に、フロックの脱水作用も行う。
【００１７】
本発明では、排水処理用凝集剤に含まれる凝集成分中、無機凝集成分と高分子凝集成分の粒子径に大小関係を持たせ、更に前記大小関係を調整することにより、無機凝集成分と高分子凝集成分との間で溶解速度（溶解時間）に差が生じるようにすることが好ましい。このようにすることで、無機凝集成分と高分子凝集成分を排水に対して同時に投入した場合であっても、実質的に急速攪拌と緩速攪拌とを組み合わせた場合と同等の作用効果を得ることができる。
【００１８】
本発明の排水処理用凝集剤では、上記した理由により、無機凝集成分の粒子径（ｄ１）と高分子凝集成分の粒子径（ｄ２）の比率がｄ１≦ｄ２の関係を満たしていることが好ましい。
【００１９】
更に本発明の排水処理用凝集剤では、上記した理由により、無機凝集成分の粒子径（ｄ１）と高分子凝集成分の粒子径（ｄ２）の比率（ｄ２／ｄ１）は、好ましくは１〜１００、より好ましくは２〜５０、更に好ましくは３〜３０である。なお、無機凝集成分の粒子径（ｄ１）は無機凝集成分の粒子径中の最大値であり、高分子凝集成分の粒子径（ｄ２）は高分子凝集成分の粒子径中の最小値である。
【００２０】
無機凝集成分の粒子径（ｄ１）は、好ましくは０．０２〜０．１５ｍｍ、より好ましくは０．０３〜０．１４ｍｍ、更に好ましくは０．０４〜０．１３ｍｍである。
【００２１】
ベントナイトの粒子径は、好ましくは０．０２〜０．０８ｍｍ、より好ましくは０．０３〜０．０７ｍｍ、更に好ましくは０．０４〜０．０６ｍｍであり；硫酸アルミニウムの粒子径は、好ましくは０．０５〜０．１５ｍｍ、より好ましくは０．０６〜０．１４ｍｍ、更に好ましくは０．０７〜０．１３ｍｍである。
【００２２】
高分子凝集成分の粒子径（ｄ２）は、好ましくは０．１５〜２ｍｍ、より好ましくは０．１６〜１．８ｍｍ、更に好ましくは０．１７〜１．５ｍｍである。
【００２３】
アルギン酸ナトリウムの粒子径は、好ましくは０．１５〜０．８ｍｍ、より好ましくは０．１６〜０．７ｍｍ、更に好ましくは０．１７〜０．５ｍｍであり；カチオン性ポリアクリルアミドの粒子径は、好ましくは０．２〜２ｍｍ、より好ましくは０．３〜１．８ｍｍ、更に好ましくは０．７〜１．５ｍｍである。
【００２４】
凝集成分として用いる４成分の含有割合は、ベントナイトは、好ましくは４３〜５５質量％、より好ましくは４５〜５０質量％、更に好ましくは４３〜４９質量％；硫酸アルミニウムは、好ましくは４３〜５５質量％、より好ましくは４５〜５０質量％、更に好ましくは４３〜４９質量％；アルギン酸ナトリウムは、好ましくは１〜７質量％、より好ましくは１．５〜６質量％、更に好ましくは１．８〜５質量％；カチオン性ポリアクリルアミドは、好ましくは１〜７質量％、より好ましくは１．５〜６質量％、更に好ましくは１．８〜５質量％である。
【００２５】
本発明の排水処理用凝集剤は、粉末状乃至は粒子状のものであるが、排水中に投入した場合に速やかに崩壊できる程度であれば、圧縮成型等の方法を適用し、所望形状に成型することもできる。
【００２６】
本発明の排水処理用凝集剤の使用量は、処理対象となる排水の汚れの程度に応じて適宜設定するが、ＣＯＤ濃度が３０〜３００ｍｇ／Ｌ程度の排水に対し、排水中の凝集剤濃度が２０〜１００ｍｇ／Ｌ程度になるように添加すれば良い。
【００２７】
本発明の排水処理用凝集剤を使用する場合、処理対象となる排水に対して、所要量の全部を一度に投入する方法、所要量を連続投入する方法、所要量を複数回に分けて分割投入する方法を適用できる。
【００２８】
本発明の排水処理用凝集剤は、各種排水処理施設、処理装置用の凝集剤として適用できるものであり、特に凝集剤用の設備面積を小さくできるので、処理装置を小型化する上で有用である。本発明の排水処理用凝集剤は、汚濁の程度が大きな天然水の浄水処理にも適用できる。
【００２９】
【実施例】
以下に、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例によって限定されるものではない。
【００３０】
（１）粒子径（５０％粒子径）の測定
目開き０．０１〜２ｍｍの種々の篩を用い、投入した量の半分以上が残留するときの篩の目開きを粒子径とした。
【００３１】
（２）凝集処理試験
１Ｌ用のビーカーに１Ｌの排水を入れた後、凝集剤を１００ｍｇ／Ｌ投入した。その後、攪拌機として４連式ジャーテスター（（株）宮本製作所）を用い、１６０回転／分の条件で１０分間攪拌し、２０分間静置した。得られた上澄み液５００ｍｌに対して、ＣＯＤと濁度の測定を行った。
【００３２】
（３）ＣＯＤ
排水（原水）及び上澄み液２ｍｌをＣＯＤ試薬バイアル（Ｃａｔ．２１２５９−２５；０〜１，５００ｍｇ／Ｌ用；ＨＡＣＨ社製）に投入し、１５０℃にて２時間加熱した後、冷却し、ＨＡＣＨ社製の水質分析計（ＤＲ／２０１０）により、ＣＯＤ濃度を測定した。
【００３３】
（４）濁度
凝集沈殿後の上澄み液をＨＡＣＨ社製の携帯濁度計（２１００Ｐ）により測定した。
【００３４】
実施例１
ベントナイト（ホージュン製；粒子径０．０４５ｍｍ）４８質量％、硫酸アルミニウム（浅田化学工業製；粒子径０．１２ｍｍ）４８質量％、アルギン酸ナトリウム（アルギテックスＬ，キミカ製；粒子径０．４ｍｍ）２質量％、アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体（アコフロックＣ４８６，三井サイテック社製；粒子径１．２ｍｍ）２質量％の各成分を混合し、本発明の排水処理用凝集剤を得た。無機凝集成分の粒子径（ｄ１）は０．１２ｍｍ（最大値）、高分子凝集成分の粒子径（ｄ２）は０．４ｍｍ（最小値）であった。
【００３５】
この凝集剤を用い、上記の凝集処理試験に従って洗車排水（ＣＯＤ値６３ｍｇ／Ｌ，濁度１６ＮＴＵ）の処理を行った。処理後のＣＯＤ値及び濁度を表１に示す。
【００３６】
実施例２
ベントナイト（ホージュン製；粒子径０．０４５ｍｍ）４８質量％、硫酸アルミニウム（和光純薬製；粒子径０．０７ｍｍ）４８質量％、アルギン酸ナトリウム（アルギテックスＬ，キミカ製；粒子径０．４ｍｍ）２質量％、アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体（アコフロックＣ４９３Ｈ，三井サイテック社製；粒子径０．３ｍｍ）２質量％の各成分を混合し、本発明の排水処理用凝集剤を得た。無機凝集成分の粒子径（ｄ１）は０．０７ｍｍ（最大値）、高分子凝集成分の粒子径（ｄ２）は０．３ｍｍ（最小値）であった。
【００３７】
この凝集剤を用い、上記の凝集処理試験に従って洗車排水（ＣＯＤ値６３ｍｇ／Ｌ，濁度１６ＮＴＵ）の処理を行った。処理後のＣＯＤ値及び濁度を表１に示す。
【００３８】
実施例３
ベントナイト（ホージュン製；粒子径０．０４５ｍｍ）４８質量％、硫酸アルミニウム（浅田化学工業製；粒子径０．１２ｍｍ）４８質量％、アルギン酸ナトリウム（和光純薬製；粒子径０．０６ｍｍ）２質量％、アクリルアミド−２−（メタクリロイルオキシ）エチルトリメチルアンモニウムクロリド共重合体（粒子径０．１ｍｍに調整したもの）２質量％の各成分を混合し、本発明の排水処理用凝集剤を得た。無機凝集成分の粒子径（ｄ１）は０．１２ｍｍ（最大値）、高分子凝集成分の粒子径（ｄ２）は０．０６ｍｍ（最小値）であった。
【００３９】
この凝集剤を用い、上記の凝集処理試験に従って洗車排水（ＣＯＤ値６３ｍｇ／Ｌ，濁度１６ＮＴＵ）の処理を行った。処理後のＣＯＤ値及び濁度を表１に示す。
【００４０】
比較例１
ベントナイト及び植物抽出エキスからなる混合物（ＵＥＳＴＡＣ ＮＢＰ−Ａ１，２）と、硫酸アルミニウム及びデンプン誘導体カチオン性アクリルアミド共重合体からなる混合物（ＵＥＳＴＡＣ ＢＣ９−Ｂ）を１００ｍｇ／Ｌになるように等量混合した凝集剤を用い、洗車排水（ＣＯＤ値６３ｍｇ／Ｌ，濁度１６ＮＴＵ）の処理を行った。処理後のＣＯＤ値及び濁度を表１に示す。
【００４１】
比較例２
比較例１の凝集剤を用いて凝集処理するとき、ＵＥＳＴＡＣ ＮＢＰ−Ａ１，２を５０ｍｇ／Ｌになるように添加後、１６０回転／分で５分間急速攪拌した。次に、ＵＥＳＴＡＣ ＢＣ９−Ｂを５０ｍｇ／Ｌになるように添加後、２０回転／分で５分間緩速攪拌した。処理後のＣＯＤ値及び濁度を表１に示す。
【００４２】
【表１】
表１から明らかなとおり、実施例１〜３の凝集剤は優れた凝集処理能力を示した。実施例２は、ｄ２／ｄ１が１未満となったため、実施例１、２と比べると、凝集処理能力が劣った。
【００４４】
更に、実施例１〜３、特に実施例１、２は、急速攪拌と緩速攪拌を組み合わせた比較例２と比べても同等以上の凝集処理能力を有するものであるから、急速攪拌と緩速攪拌を組み合わせた従来技術と同等以上の処理能力を確保したまま、凝集剤設備面積の縮小、投入手段の簡略化等ができるようになることが確認された。
【００４５】
【発明の効果】
本発明の排水処理用凝集剤によれば、急速攪拌及び緩速攪拌の組み合わせが不要となり、凝集剤を成分ごとに２剤に分割する必要もないため、凝集剤設備面積が大きくなることや、凝集剤の投入手段が複数必要となるという問題が解決される。このため、本発明の排水処理用凝集剤を適用すれば、排水処理装置をより小型化することができるようになる。
【００４６】
更に本発明の排水処理用凝集剤によれば、洗車排水のように、特に難沈降性物質を含む排水を高度処理することができると共に、排水処理装置の小型化もできるようになるため、既設の洗車場等にも容易に適用することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coagulant for discharge treatment which is particularly suitable for highly treating wastewater containing hardly sedimentable substances.
[0002]
Problems to be solved by the prior art and the invention
In the case of wastewater treatment using a flocculant, in order to efficiently flocculate the suspended particles, the flocculant is uniformly mixed into the suspension, and then rapidly stirred to form micro flocs. It is known to use a process of colliding and gathering micro floc groups and fine particle groups by slow stirring. (Agglomeration engineering-basics and applications-; Japan Powder Industry Association)
Commonly used coagulants include inorganic coagulants such as aluminum sulfate, polyaluminum chloride, and iron chloride, and water-soluble polymer coagulants such as polyacrylamide. Inorganic flocculants are likely to undergo aggregation due to hydroxides having a positive charge, and polymer flocculants form agglomerates by causing the groups of particles in contact to aggregate by cross-linking action. Agents and polymeric flocculants are often used in combination.
[0003]
Also, when the inorganic flocculant and the polymer flocculant are used in combination, as described above, the inorganic flocculant is added, and the mixture is rapidly stirred to form a micro floc group. A processing method of forming larger aggregates by stirring is applied.
[0004]
Japanese Patent No. 168225 discloses that treated water obtained by adding bentonite and a cationic polymer flocculant to wastewater containing a surfactant, oil and the like is introduced into a mixing tank, and an aluminum salt and an alkali agent are added. A method of separating flocculated flocs in a sedimentation basin after performing a flocculation reaction is disclosed. However, it is necessary to separately add coagulants such as an inorganic coagulant and a polymer coagulant with a time lag, which is troublesome, requires a plurality of coagulant injection means, and increases the equipment area. However, there is a disadvantage that the device becomes large.
[0005]
A chemical industry daily report dated June 26, 2001 states that a wastewater treatment agent consisting of an A agent mainly composed of bentonite and a plant extract and a B agent mainly composed of aluminum sulfate and a starch derivative cationic acrylamide polymer. [Product name Westack sold by Westec] is introduced. However, since this wastewater treatment agent needs to first add a powdered A agent to the aqueous paint waste liquid and then add a liquid in which the B agent is dissolved in water, similar to the above-mentioned patent invention, There is a problem that the equipment area becomes large and a plurality of means for feeding a coagulant are required.
[0006]
Japanese Patent Application Laid-Open No. 9-225208 discloses a mixed flocculant in which an adsorbing substance such as bentonite, a carbonate, a sulfate, and a polymer flocculant are mixed in a predetermined ratio. Although this technique solves the problem of requiring a plurality of facility areas and a plurality of coagulant charging means, since a plurality of types of coagulants are simultaneously charged, the polymer coagulant is adsorbed by an adsorbent such as bentonite. In some cases, the effect of adsorbing and removing contaminants by the adsorbing substance may be reduced.
[0007]
It is an object of the present invention to solve the above-mentioned problems and to provide a coagulant for discharge treatment which is particularly suitable for highly treating wastewater containing hardly sedimentable substances.
[0008]
[Means for Solving the Problems]
The present inventor adopts a combination of specific components as the aggregating component, preferably employs a specific combination of aggregating components, specifies the particle diameter ratio of the aggregating component, and adjusts the mixing ratio of the aggregating component to a predetermined range. It has been found that the above problem can be solved by making adjustments.
[0009]
The invention according to claim 1 is, as a means for solving the problem, a wastewater treatment flocculant containing bentonite and aluminum sulfate as inorganic flocculants, and sodium alginate and cationic polyacrylamide as polymer flocculants, The present invention provides a flocculant for wastewater treatment, wherein the cationic polyacrylamide is an acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride copolymer.
[0010]
The coagulant for wastewater treatment of the present invention is one as a whole and is not used separately for each component, but may be used by dividing the whole into a plurality.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The coagulant for wastewater treatment of the present invention contains bentonite (montmorillonite) and aluminum sulfate as inorganic coagulation components, sodium alginate as a polymer coagulation component, and cationic polyacrylamide (acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride). (Copolymer). In the present invention, the combined use of other aggregating components is not prevented, but from the viewpoint of solving the problem of the present invention, the combined use of other aggregating components is unnecessary.
[0012]
Among these inorganic and polymer aggregate components, each component has the following effects, and these effects are mutually related to solve the problem of the present invention.
[0013]
Bentonite alone makes the wastewater alkaline, and acts to reduce the viscosity of the solution (viscosity of the wastewater) by adsorbing the oil emulsified by the surfactant.
[0014]
Since aluminum sulfate alone renders wastewater acidic, it acts to neutralize wastewater that has become alkaline due to the addition of bentonite, thereby promoting the formation of flocs.
[0015]
The sodium alginate acts to micro-flocculate the bentonite adsorbing the oil, generate larger flocs, and further increase the size of the generated flocs.
[0016]
Cationic polyacrylamide (acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride copolymer) promotes floc enlargement by linking and assembling flocs by a cross-linking action, and also has a dehydrating action of the flocs. Do.
[0017]
In the present invention, among the coagulation components contained in the coagulant for wastewater treatment, the particle size of the inorganic coagulation component and the polymer coagulation component are given a size relationship, and further by adjusting the size relationship, the inorganic coagulation component and the polymer It is preferable that a difference occurs in the dissolution rate (dissolution time) between the aggregating component and the aggregating component. In this way, even when the inorganic coagulation component and the polymer coagulation component are simultaneously added to the wastewater, substantially the same operation and effect as when the rapid stirring and the slow stirring are combined are obtained. be able to.
[0018]
The waste water treatment flocculant of the present invention, for the reasons described above, the ratio of the particle diameter of the particle diameter (d 1) and the polymer flocculant component of the inorganic aggregating component (d 2) is satisfied a relationship of d 1 ≦ d 2 Is preferred.
[0019]
Further wastewater treatment flocculant of the present invention, for the reasons described above, the ratio of the particle diameter of the particle diameter (d 1) and the polymer flocculant component of the inorganic aggregating component (d 2) (d 2 / d 1) is preferably Is 1 to 100, more preferably 2 to 50, and still more preferably 3 to 30. The particle diameter (d 1 ) of the inorganic aggregating component is the maximum value in the particle diameter of the inorganic aggregating component, and the particle size (d 2 ) of the polymer aggregating component is the minimum value in the particle size of the polymer aggregating component. is there.
[0020]
The particle diameter (d 1 ) of the inorganic coagulation component is preferably 0.02 to 0.15 mm, more preferably 0.03 to 0.14 mm, and still more preferably 0.04 to 0.13 mm.
[0021]
The particle size of the bentonite is preferably 0.02 to 0.08 mm, more preferably 0.03 to 0.07 mm, and still more preferably 0.04 to 0.06 mm; the particle size of aluminum sulfate is preferably 0 to 0.08 mm. 0.05 to 0.15 mm, more preferably 0.06 to 0.14 mm, and still more preferably 0.07 to 0.13 mm.
[0022]
The particle diameter (d2) of the polymer aggregation component is preferably 0.15 to 2 mm, more preferably 0.16 to 1.8 mm, and still more preferably 0.17 to 1.5 mm.
[0023]
The particle size of sodium alginate is preferably 0.15-0.8 mm, more preferably 0.16-0.7 mm, even more preferably 0.17-0.5 mm; the particle size of cationic polyacrylamide is Preferably it is 0.2 to 2 mm, more preferably 0.3 to 1.8 mm, even more preferably 0.7 to 1.5 mm.
[0024]
As for the content ratio of the four components used as the aggregating component, bentonite is preferably 43 to 55% by mass, more preferably 45 to 50% by mass, and still more preferably 43 to 49% by mass; and aluminum sulfate is preferably 43 to 55% by mass. %, More preferably 45 to 50% by weight, even more preferably 43 to 49% by weight; sodium alginate is preferably 1 to 7% by weight, more preferably 1.5 to 6% by weight, still more preferably 1.8 to 5 mass%; cationic polyacrylamide is preferably 1 to 7 mass%, more preferably 1.5 to 6 mass%, and still more preferably 1.8 to 5 mass%.
[0025]
The coagulant for wastewater treatment of the present invention is in the form of powder or particles, but if it can be rapidly disintegrated when introduced into wastewater, a method such as compression molding is applied to obtain a desired shape. It can also be molded.
[0026]
The amount of the coagulant for wastewater treatment of the present invention is appropriately set according to the degree of contamination of the wastewater to be treated. For a wastewater having a COD concentration of about 30 to 300 mg / L, the concentration of the coagulant in the wastewater is determined. May be added so as to be about 20 to 100 mg / L.
[0027]
When the wastewater treatment flocculant of the present invention is used, a method of charging all the required amount at once, a method of continuously supplying the required amount, and dividing the required amount into a plurality of times, for the wastewater to be treated. Applying method can be applied.
[0028]
The coagulant for wastewater treatment of the present invention can be applied as a coagulant for various wastewater treatment facilities and treatment equipment. In particular, the equipment area for the coagulant can be reduced. is there. The coagulant for wastewater treatment of the present invention can also be applied to water purification treatment of natural water having a high degree of pollution.
[0029]
【Example】
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
[0030]
(1) Measurement of Particle Diameter (50% Particle Diameter) Various sieves having an opening of 0.01 to 2 mm were used, and the sieve opening when half or more of the charged amount remained was defined as the particle diameter.
[0031]
(2) Coagulation treatment test After 1 L of drainage was put into a 1 L beaker, a coagulant was added at 100 mg / L. Thereafter, using a quadruple jar tester (Miyamoto Seisakusho Co., Ltd.) as a stirrer, the mixture was stirred for 10 minutes at 160 rpm, and allowed to stand for 20 minutes. COD and turbidity were measured for 500 ml of the obtained supernatant.
[0032]
(3) COD
The wastewater (raw water) and 2 ml of the supernatant were put into a COD reagent vial (Cat. 21259-25; 0 to 1,500 mg / L; manufactured by HACH), heated at 150 ° C. for 2 hours, cooled, and cooled. The COD concentration was measured by a water quality analyzer (DR / 2010) manufactured by the company.
[0033]
(4) Turbidity The supernatant liquid after aggregation precipitation was measured by a portable turbidity meter (2100P) manufactured by HACH.
[0034]
Example 1
48% by mass of bentonite (manufactured by Hojun; particle size: 0.045 mm); 48% by mass of aluminum sulfate (manufactured by Asada Chemical Industry; particle size: 0.12 mm); sodium alginate (manufactured by Argitex L, manufactured by Kimika; particle size: 0.4 mm) 2 2% by mass of acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride copolymer (Acofloc C486, manufactured by Mitsui Cytec Co., Ltd .; particle diameter 1.2 mm) are mixed, and the coagulation for wastewater treatment of the present invention is mixed. Agent was obtained. The particle diameter (d 1 ) of the inorganic aggregation component was 0.12 mm (maximum value), and the particle diameter (d 2 ) of the polymer aggregation component was 0.4 mm (minimum value).
[0035]
Using this flocculant, treatment of car wash drainage (COD value 63 mg / L, turbidity 16 NTU) was performed according to the flocculation treatment test described above. Table 1 shows the COD value and the turbidity after the treatment.
[0036]
Example 2
48% by mass of bentonite (manufactured by Hojun; particle size: 0.045 mm); 48% by mass of aluminum sulfate (manufactured by Wako Pure Chemical; particle size: 0.07 mm); sodium alginate (manufactured by Argitex L, manufactured by Kimica; particle size: 0.4 mm) 2 2% by mass of an acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride copolymer (Acofloc C493H, manufactured by Mitsui Cytec Co., Ltd .; particle diameter 0.3 mm) was mixed, and the coagulation for wastewater treatment of the present invention was mixed. Agent was obtained. The particle diameter (d 1 ) of the inorganic aggregation component was 0.07 mm (maximum value), and the particle diameter (d 2 ) of the polymer aggregation component was 0.3 mm (minimum value).
[0037]
Using this flocculant, treatment of car wash drainage (COD value 63 mg / L, turbidity 16 NTU) was performed according to the flocculation treatment test described above. Table 1 shows the COD value and the turbidity after the treatment.
[0038]
Example 3
48 mass% of bentonite (manufactured by Hojun; particle size 0.045 mm), 48 mass% of aluminum sulfate (manufactured by Asada Chemical Industry; particle size 0.12 mm), 2 mass% of sodium alginate (manufactured by Wako Pure Chemical Industries, particle size 0.06 mm) And 2% by mass of each component of acrylamide-2- (methacryloyloxy) ethyltrimethylammonium chloride copolymer (adjusted to a particle diameter of 0.1 mm) were mixed to obtain a flocculant for wastewater treatment of the present invention. The particle diameter (d 1 ) of the inorganic aggregation component was 0.12 mm (maximum value), and the particle diameter (d 2 ) of the polymer aggregation component was 0.06 mm (minimum value).
[0039]
Using this flocculant, treatment of car wash drainage (COD value 63 mg / L, turbidity 16 NTU) was performed according to the flocculation treatment test described above. Table 1 shows the COD value and the turbidity after the treatment.
[0040]
Comparative Example 1
A mixture consisting of bentonite and a plant extract (UESTAC NBP-A1,2) and a mixture consisting of aluminum sulfate and a starch derivative cationic acrylamide copolymer (UESTAC BC9-B) were mixed in an equal amount to 100 mg / L. Car wash wastewater (COD value 63 mg / L, turbidity 16 NTU) was treated using a coagulant. Table 1 shows the COD value and the turbidity after the treatment.
[0041]
Comparative Example 2
When performing the flocculation treatment using the flocculant of Comparative Example 1, UESTAC NBP-A1,2 was added at 50 mg / L and then rapidly stirred at 160 rpm for 5 minutes. Next, UESTAC BC9-B was added to a concentration of 50 mg / L, followed by gentle stirring at 20 rpm for 5 minutes. Table 1 shows the COD value and the turbidity after the treatment.
[0042]
[Table 1]
As is clear from Table 1, the flocculants of Examples 1 to 3 exhibited excellent flocculation treatment ability. In Example 2, since d 2 / d 1 was less than 1, the aggregating treatment ability was inferior to Examples 1 and 2.
[0044]
Further, since Examples 1 to 3, especially Examples 1 and 2 have the same or higher aggregating processing ability as compared to Comparative Example 2 in which rapid stirring and slow stirring are combined, rapid stirring and slow stirring are performed. It has been confirmed that the coagulant equipment area can be reduced, the charging means can be simplified, and the like, while maintaining a processing ability equal to or higher than that of the conventional technique combined with stirring.
[0045]
【The invention's effect】
According to the flocculant for wastewater treatment of the present invention, a combination of rapid stirring and slow stirring is not required, and it is not necessary to divide the flocculant into two components for each component. This solves the problem that a plurality of coagulant charging means are required. For this reason, if the coagulant for wastewater treatment of the present invention is applied, the size of the wastewater treatment device can be further reduced.
[0046]
Furthermore, according to the coagulant for wastewater treatment of the present invention, wastewater containing particularly hardly sedimentable substances, such as car wash wastewater, can be highly treated, and the wastewater treatment device can be downsized. It can be easily applied to a car wash and the like.
Claims (7)
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| CN100417689C (en) * | 2006-10-10 | 2008-09-10 | 孙立军 | Permeability-reducing admixture for paddy field |
| CN101327976B (en) * | 2008-07-15 | 2012-01-25 | 南通立源水业科技发展有限公司 | Efficient water treatment flocculant |
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| JP2014184416A (en) * | 2013-03-25 | 2014-10-02 | Kajima Corp | Flocculant composition and method of treating polluted water |
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| CN111701572A (en) * | 2020-01-03 | 2020-09-25 | 鲁东大学 | Biomass-based adsorbent and method for treating desizing wastewater COD by using same |
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