JP2006263514A - Flocculation and dehydration method of muddy water - Google Patents
Flocculation and dehydration method of muddy water Download PDFInfo
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Abstract
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本発明は、濁水の凝集脱水処理方法に関するものであり、特に、建設工事排水等の濁水の、脱水時間の短縮した凝集脱水処理方法に関するものである。 The present invention relates to a turbid water coagulation dehydration method, and more particularly, to a coagulation dehydration method with reduced dehydration time for muddy water such as construction wastewater.
従来より、建設工事排水等の濁水の凝集処理には、無機系凝集剤と有機系凝集剤を単独又は組合わせて使用し、微細粒子の凝結やフロック化を行っている（例えば、特許文献１参照）。 Conventionally, in coagulation treatment of turbid water such as construction wastewater, an inorganic coagulant and an organic coagulant are used alone or in combination, and fine particles are condensed or flocked (for example, Patent Document 1). reference).
この凝集処理したフロックは、沈降性が速くなるため、分離水の除去に効果的であるが、近年は沈降したフロックに、さらに機械的脱水処理を行うのが一般的である。また、凝集処理では、懸濁排水の懸濁物濃度やｐＨ、有機物量等によって凝集剤の添加量やフロック生成の攪拌条件を設定しているのが一般的である。
しかしながら、この凝集処理において、有機系凝集剤として高分子凝集剤を添加したフロックは、機械的脱水処理での脱水性が極めて悪く、長時間の脱水が必要となったり、あるいは高い圧力の脱水や脱水機の大型化が必要であるという問題があった。 However, in this agglomeration treatment, flocs added with a polymer flocculant as an organic flocculant have extremely poor dehydration properties in mechanical dehydration treatment, and require long-time dehydration or high pressure dehydration. There was a problem that it was necessary to increase the size of the dehydrator.
そのため、濁水の凝集・脱水処理を効率的に行うため、脱水機の改良や脱水助剤の使用が試みられているが、処理のコスト上昇や設置スペースの拡大等の問題があり、完全な解決法には至らなかった。 For this reason, attempts have been made to improve the dehydrator and use dehydration aids to efficiently agglomerate and dehydrate the turbid water. The law was not reached.
本発明は、上記従来技術の問題点に鑑み、脱水ケーキの含水率が低く、フロックの脱水性が向上し、脱水時間を短縮した、濁水の凝集脱水処理方法を提供することを目的とする。 An object of the present invention is to provide a turbid water coagulation dehydration method in which the moisture content of a dehydrated cake is low, the dewaterability of flocs is improved, and the dehydration time is shortened.
かかる課題を解決するため、
請求項１にかかる発明は、濁水に無機系凝集剤Ａを添加して攪拌混合した後、これに有機系凝集剤Ｂを添加し、緩速攪拌してフロックＬを生成し、該フロックＬに無機系凝集剤Ｃを添加して攪拌混合し、前記フロックＬを分解又は破壊した後、これを脱水処理することを特徴とする濁水の凝集脱水処理方法である。
To solve this problem,
In the invention according to claim 1, after adding the inorganic flocculant A to the turbid water and stirring and mixing, the organic flocculant B is added thereto, and the floc L is generated by slow stirring to generate the floc L. In this method, the inorganic flocculant C is added and mixed by stirring to decompose or destroy the floc L, followed by dehydrating the muddy water.
請求項２にかかる発明は、前記フロックＬを分解又は破壊した後、これに有機系凝集剤Ｄを添加し、緩速攪拌してフロックＭを生成し、該フロックＭを脱水処理し、脱水ケーキを生成する請求項１に記載の濁水の凝集脱水処理方法である。 In the invention according to claim 2, after decomposing or destroying the floc L, an organic flocculant D is added to the floc L, and the floc M is produced by slow stirring to dehydrate the floc M. The method for coagulating and dewatering muddy water according to claim 1.
請求項３にかかる発明は、前記フロックＭに、さらに無機系凝集剤Ｅを添加して攪拌混合し、前記フロックＭを分解又は破壊した後、これに、さらに有機系凝集剤Ｆを添加し、緩速攪拌してフロックＮを生成し、該フロックＮを脱水処理し、脱水ケーキを生成する請求項２に記載の濁水の凝集脱水処理方法である。 In the invention according to claim 3, the inorganic flocculant E is further added to the floc M and stirred and mixed. After the floc M is decomposed or destroyed, an organic flocculant F is further added thereto. The method for coagulating and dewatering muddy water according to claim 2, wherein the floc N is produced by slow stirring and the floc N is dehydrated to produce a dehydrated cake.
請求項４にかかる発明は、前記無機系凝集剤Ａ、Ｃ、及びＥが、硫酸アルミニウム、ポリ塩化アルミニウム、鉄塩からなる群から選ばれる少なくとも１種以上であり、前記有機系凝集剤Ｂ、Ｄ、及びＦが、ポリアクリルアミド又はポリアクリル酸である請求項１〜３のいずれか一項に記載の濁水の凝集脱水処理方法である。 In the invention according to claim 4, the inorganic flocculants A, C, and E are at least one selected from the group consisting of aluminum sulfate, polyaluminum chloride, and iron salt, and the organic flocculant B, D and F are polyacrylamide or polyacrylic acid, The turbid water coagulation dehydration processing method as described in any one of Claims 1-3.
本発明の濁水の凝集脱水処理方法によれば、無機系凝集剤を添加して攪拌混合するのと有機系凝集剤を添加して緩速攪拌するのを２回以上繰り返すことにより、従来の１回の添加では粗大であったフロックが分解又は破壊されて親水性でなくなるため、脱水処理におけるフロックの脱水性（水切れ性）が向上し、脱水時間を著しく短縮することができる。 According to the turbid water flocculation and dehydration treatment method of the present invention, the conventional flocculating and dewatering treatment is repeated by repeating the addition of the inorganic flocculating agent and stirring and mixing the organic flocculating agent and slow stirring twice or more. Since the flocs that have been coarse in the addition of 1 time are decomposed or destroyed and become non-hydrophilic, the dehydration property (water drainability) of the flocs in the dehydration treatment is improved, and the dehydration time can be significantly shortened.
以下、本発明に係る濁水の凝集脱水処理方法の実施形態の例を図面に示し、詳細に説明する。 Hereinafter, an example of an embodiment of a turbid water coagulation dehydration method according to the present invention will be described with reference to the drawings.
図１は、本発明の濁水の凝集脱水処理方法の一実施形態に係る工程図である。本実施形態の濁水の凝集脱水処理方法は、濁水に無機系凝集剤Ａを添加して攪拌混合した後、これに有機系凝集剤Ｂを添加し、緩速攪拌してフロックＬを生成し、該フロックＬに無機系凝集剤Ｃを添加して攪拌混合し、前記フロックＬを分解又は破壊した後、これに有機系凝集剤Ｄを添加し、緩速攪拌してフロックＭを生成し、該フロックＭを脱水処理し、脱水ケーキを生成するものである。 FIG. 1 is a process diagram according to an embodiment of the muddy water coagulation dehydration method of the present invention. In the turbid water coagulation dehydration method of this embodiment, after adding the inorganic flocculant A to the turbid water and stirring and mixing, the organic flocculant B is added thereto, and the floc L is generated by gently stirring. An inorganic flocculant C is added to the floc L and mixed with stirring. After the floc L is decomposed or destroyed, an organic flocculant D is added thereto, and the floc L is stirred slowly to produce floc M. Flock M is dehydrated to produce a dehydrated cake.
対象となる濁水とは、建設工事排水、産業廃水、無機性・有機性汚泥を含んだ懸濁水、有害物質を含有する汚染土壌を洗浄し、有害物質の吸着した微粒子を含んだ懸濁水、泥水等である。この濁水には、水中で沈降しない粒子径７５μｍ以下の微粒子が含まれているのが一般的である。 The target turbid water includes construction wastewater, industrial wastewater, suspended water containing inorganic and organic sludge, suspended water containing mud that adsorbs harmful substances by washing contaminated soil containing harmful substances. Etc. The turbid water generally contains fine particles having a particle diameter of 75 μm or less that do not settle in water.
この濁水に、最初に添加する無機系凝集剤Ａとしては、アルミニウム塩や鉄塩が挙げられる。このようなアルミニウム塩としては、例えば、硫酸アルミニウム（硫酸バンド）、ポリ塩化アルミニウム（ＰＡＣ）、塩化アルミニウム等が好適である。 Examples of the inorganic flocculant A that is first added to the muddy water include aluminum salts and iron salts. As such an aluminum salt, for example, aluminum sulfate (sulfuric acid band), polyaluminum chloride (PAC), aluminum chloride and the like are suitable.
また、鉄塩としては、塩化第一鉄、塩化第二鉄、硫酸第一鉄、硫酸第二鉄、ポリ硫酸鉄等が使用される。そのなかでも、硫酸アルミニウム、ポリ塩化アルミニウム、鉄塩からなる群から選ばれる少なくとも１種以上であるのが好ましい。これらの無機系凝集剤は、１種又は２種以上が目的に応じて適宜選択して使用される。 Moreover, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, polyiron sulfate, etc. are used as the iron salt. Among these, at least one selected from the group consisting of aluminum sulfate, polyaluminum chloride, and iron salt is preferable. One or two or more of these inorganic flocculants are appropriately selected according to the purpose and used.
無機系凝集剤Ａの添加量は、濁水の性状にもよるが、濁水に対して１０〜５０００ｐｐｍであるのが好ましく、１００〜１０００ｐｐｍであるのがより好ましい。無機系凝集剤Ａの添加量を適性にすることで、濁水中の単一微粒子をいくつかの微粒子が結合したフロック状にすることができる。 The amount of the inorganic flocculant A added is preferably 10 to 5000 ppm, more preferably 100 to 1000 ppm with respect to the turbid water, although it depends on the nature of the turbid water. By making the addition amount of the inorganic flocculant A appropriate, single particles in turbid water can be made into a floc form in which several particles are bonded.
濁水に、無機系凝集剤Ａを添加して攪拌混合を行う。この攪拌混合には、公知の攪拌混合装置を用いることができる。攪拌混合の時間は３０秒以上の滞留時間を確保するのが好ましい。３０秒以上の滞留時間を確保することにより、微粒子が電気的に中和する凝集反応を充分に行うことができる。また、攪拌混合の速度は、１００〜５０００ｒｐｍであるのが好ましく、３００〜３０００ｒｐｍであるのがより好ましい。 The inorganic flocculant A is added to the turbid water and mixed with stirring. A known stirring and mixing device can be used for the stirring and mixing. It is preferable to ensure a residence time of 30 seconds or more for the stirring and mixing time. By ensuring a residence time of 30 seconds or longer, an agglomeration reaction in which the fine particles are electrically neutralized can be sufficiently performed. Further, the stirring and mixing speed is preferably 100 to 5000 rpm, and more preferably 300 to 3000 rpm.
次いで、これに有機系凝集剤Ｂを添加する。添加する有機系凝集剤Ｂとしては、高分子凝集剤が挙げられる。そのなかでも、ポリアクリルアミド又はポリアクリル酸が好ましい。また、有機系凝集剤Ｂの添加量は、濁水に対して１〜５００ｐｐｍであるのが好ましく、３〜３００ｐｐｍであるのがより好ましい。有機系凝集剤Ｂの添加量を適正にすることにより、高分子で固形物を包んで粗大化した含水状のフロックＬとすることができる。 Next, the organic flocculant B is added thereto. Examples of the organic flocculant B to be added include polymer flocculants. Among these, polyacrylamide or polyacrylic acid is preferable. Moreover, it is preferable that it is 1-500 ppm with respect to muddy water, and, as for the addition amount of the organic type flocculant B, it is more preferable that it is 3-300 ppm. By making the addition amount of the organic coagulant B appropriate, it is possible to obtain a hydrous floc L that is coarsened by wrapping a solid with a polymer.
有機系凝集剤Ｂを添加した後、緩速攪拌してフロックＬを生成する。有機系凝集剤Ｂを添加した後の攪拌混合は、先の無機系凝集剤Ａを添加した際の攪拌混合時の速度よりも遅く、１０〜５００ｒｐｍとするのが好ましく、１０〜１００ｒｐｍとするのがより好ましい。緩速攪拌を行うことにより、機械的切断によるフロックの分断が減り、フロックＬを粗大化し、沈降速度を速くすることができる。また、緩速攪拌の時間は３０秒以上の滞留時間を確保するのが好ましい。 After the organic flocculant B is added, floc L is produced by gentle stirring. The stirring and mixing after adding the organic flocculant B is slower than the speed during stirring and mixing when the inorganic flocculant A is added, and is preferably 10 to 500 rpm, and is preferably 10 to 100 rpm. Is more preferable. By carrying out the slow stirring, the division of flocs due to mechanical cutting is reduced, the floc L is coarsened, and the sedimentation speed can be increased. Moreover, it is preferable that the slow stirring time secures a residence time of 30 seconds or more.
従来法では、この生成したフロックＬをそのまま脱水処理して処理が完了する。本実施形態ではここで脱水処理は行わず、このフロックＬに無機系凝集剤Ｃを添加して攪拌混合を行う。添加する無機系凝集剤Ｃには、上記無機系凝集剤Ａで挙げた凝集剤を用いることができる。 In the conventional method, the generated floc L is dehydrated as it is to complete the process. In the present embodiment, the dehydration process is not performed here, and the inorganic flocculant C is added to the floc L to perform stirring and mixing. As the inorganic flocculant C to be added, the flocculants exemplified in the inorganic flocculant A can be used.
また、無機系凝集剤Ｃの添加量は、無機系凝集剤Ａの添加量と同量かそれ以下であるのが好ましい。また、攪拌混合には、無機系凝集剤Ａの添加に用いたのと同様の装置を用いることができ、攪拌混合時間、速度も同様とするのが好ましい。 Moreover, it is preferable that the addition amount of the inorganic coagulant C is equal to or less than the addition amount of the inorganic coagulant A. In addition, for stirring and mixing, the same apparatus as that used for adding the inorganic flocculant A can be used, and the stirring and mixing time and speed are preferably the same.
一旦生成したフロックＬに、無機系凝集剤Ｃを添加すると、フロックＬが攪拌によって切断され壊れて高分子ポリマーが縮み、親水性でなくなるため、フロックＬの内部に含まれていた水を離す。フロックＬとは、無機系凝集剤Ａの添加で凝結や電気的中和により接触した微粒子群に、有機系凝集剤Ｂを添加して、有機系凝集剤Ｂのポリマーが微粒子群と水を同時に包み込んで粗大フロックとしたものである。このフロックＬに無機系凝集剤Ｃが添加されると、粗大フロックのポリマーが分解・縮小して水を離し、フロックが細かくなる。 Once the inorganic flocculant C is added to the floc L that has been generated, the floc L is cut and broken by stirring and the polymer polymer shrinks and becomes non-hydrophilic, so that the water contained inside the floc L is released. Flock L means that organic flocculant B is added to a group of fine particles brought into contact by condensation or electrical neutralization by addition of inorganic flocculant A, and the polymer of organic flocculant B causes the fine particle group and water to be mixed simultaneously. Wrapped into coarse flocs. When the inorganic flocculant C is added to the floc L, the coarse floc polymer is decomposed and reduced to release water, and the floc becomes finer.
この状態で脱水処理を行うこともできるが、フロックＬの分解物は流動性があり、脱水ケーキのような固形物として取り除くのは難しいため、この場合、後述するフロックＭの脱水処理時の圧力よりも１．５倍以上高くして行う必要がある。 Although dehydration can be performed in this state, the decomposition product of floc L is fluid and difficult to remove as a solid such as a dewatered cake. It is necessary to carry out at 1.5 times higher than that.
本実施形態では、ここで脱水処理は行わず、次の工程まで進む。すなわち、フロックＬの分解物に有機系凝集剤Ｄを添加し、緩速攪拌してフロックＭを生成する。添加する有機系凝集剤Ｄには、上記有機系凝集剤Ｂで挙げた凝集剤を用いることができる。また、有機系凝集剤Ｄの添加量は、有機系凝集剤Ｂの添加量より少なくてもよいし、同量以上でもよい。 In this embodiment, dehydration is not performed here, and the process proceeds to the next step. That is, the organic flocculant D is added to the decomposition product of floc L, and the floc M is generated by stirring gently. As the organic flocculant D to be added, the flocculants exemplified in the organic flocculant B can be used. Moreover, the addition amount of the organic coagulant D may be less than the addition amount of the organic coagulant B, or may be the same or more.
また、攪拌混合には、有機系凝集剤Ｂの添加に用いたのと同様の装置を用いることができ、攪拌混合時間、速度も同様とするのが好ましい。フロックＬを一度分解して再凝集することにより、余分な水も脱離するため、フロックＭの含水率をフロックＬよりも低下することができる。 In addition, the same apparatus as that used for the addition of the organic coagulant B can be used for the agitation and mixing, and the agitation and mixing time and speed are preferably the same. When the floc L is once decomposed and re-agglomerated, excess water is also desorbed, so that the moisture content of the floc M can be lowered than that of the floc L.
次いで、このフロックＭを脱水処理し、脱水ケーキを生成する。脱水処理には、ベルトプレス、フィルタープレス、真空脱水機等の公知の脱水機を用いることができる。このフロックＭは、フロックＬに比べ脱水性が向上しているため、脱水機の処理能力を１．５倍以上向上させ、脱水時間を５０％程度短縮することができる。また、含水率の低減した脱水ケーキを得ることができる。 Next, the floc M is dehydrated to produce a dehydrated cake. For the dehydration treatment, a known dehydrator such as a belt press, a filter press, or a vacuum dehydrator can be used. Since the floc M has improved dewaterability compared to the floc L, the processing capacity of the dehydrator can be improved by 1.5 times or more, and the dewatering time can be shortened by about 50%. In addition, a dehydrated cake having a reduced moisture content can be obtained.
本発明の濁水の凝集脱水処理方法では、凝集剤を２回添加するため、従来法に比べ凝集剤の使用量は１．５倍以上になるが、脱水機の処理能力が向上し、脱水時間が短縮できるため、凝集・脱水の総コストは、従来に比べ３０〜５０％削減することができる。 In the turbid water coagulation dehydration treatment method of the present invention, since the coagulant is added twice, the amount of the coagulant used is 1.5 times or more compared with the conventional method, but the processing capacity of the dehydrator is improved and the dehydration time is increased. Therefore, the total cost of flocculation / dehydration can be reduced by 30 to 50% compared to the conventional case.
本実施形態では、有機系凝集剤Ｄを添加して生成したフロックＭを脱水処理しているが、このフロックＭに、さらに無機系凝集剤Ｅを添加して攪拌混合し、フロックＭを分解又は破壊した後、これに、さらに有機系凝集剤Ｆを添加し、緩速攪拌してフロックＮを生成し、フロックＮを脱水処理し、脱水ケーキを生成してもよい。 In this embodiment, the floc M produced by adding the organic flocculant D is dehydrated, but the floc M is further added with an inorganic flocculant E and mixed with stirring to decompose or disassemble the floc M. After the destruction, an organic flocculant F may be further added thereto, and the floc N may be generated by stirring gently to generate a dehydrated cake by dehydrating the floc N.
この場合、無機系凝集剤Ｅには、上記無機系凝集剤Ｃで挙げた凝集剤を用いることができ、添加量も無機系凝集剤Ｃの添加量と同量とすることができる。また、有機系凝集剤Ｆには、上記有機系凝集剤Ｄで挙げた凝集剤を用いることができ、添加量も有機系凝集剤Ｄの添加量と同量とすることができる。 In this case, as the inorganic flocculant E, the flocculants exemplified in the above-mentioned inorganic flocculant C can be used, and the addition amount can be the same as the addition amount of the inorganic flocculant C. In addition, the organic flocculant F can be the same flocculant as mentioned in the organic flocculant D, and the addition amount can be the same as the addition amount of the organic flocculant D.
上記のように凝集剤の添加を３回行うことにより、フロックＮの脱水性をさらに向上させることができる。 By adding the flocculant three times as described above, the dewaterability of floc N can be further improved.
以下、実施例により、本発明をさらに詳しく説明する。本発明は、下記実施例に何ら制限されるものではない。 Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to the following examples.
［実施例１］
有害物質を含有する汚染土壌を洗浄し、有害物質の吸着した微粒子を含んだ懸濁水に、無機系凝集剤Ａであるポリ塩化アルミニウム（略して、「ＰＡＣ」という。）を５００ｐｐｍ添加し、プロペラ型攪拌機（スリーワンモーター）で１分２００ｒｐｍで攪拌混合した。これに有機系凝集剤ＢであるＰＡ−３３１（（株）クリタ）を５ｐｐｍを添加し、０．５分２０ｒｐｍで緩速攪拌してフロックＬを生成した。
[Example 1]
After washing contaminated soil containing harmful substances, 500 ppm of polyaluminum chloride (abbreviated as “PAC”), an inorganic flocculant A, is added to suspended water containing fine particles adsorbed with harmful substances. The mixture was stirred and mixed at 200 rpm for 1 minute with a mold stirrer (three-one motor). To this was added 5 ppm of PA-331 (Kurita Co., Ltd.), an organic flocculant B, and the mixture was gently stirred at 20 rpm for 0.5 minutes to produce floc L.
このフロックＬに、さらに無機系凝集剤ＣであるＰＡＣを２５０ｐｐｍ添加して、上記装置で１分２００ｒｐｍ攪拌混合し、このフロックＬを壊した。これに有機系凝集剤ＤであるＰＡ−３３１を１０ｐｐｍ添加し、０．５分２０ｒｐｍで緩速攪拌してフロックＭを生成した。これらの凝集剤の添加量を表１に示す。 To this floc L, 250 ppm of PAC, which is an inorganic flocculant C, was further added, and the mixture was stirred and mixed for 1 minute at 200 rpm with the above apparatus, and the floc L was broken. To this, 10 ppm of PA-331, an organic flocculant D, was added and stirred gently at 20 rpm for 0.5 minutes to produce floc M. The amount of these flocculants added is shown in Table 1.
このフロックＭをヌッチェ式真空脱水装置で脱水処理し、脱水ケーキ約２０ｇを得た。この時の脱水量（ｍｌ）と脱水時間（秒）との関係を測定し、図２に示した。図２は、フロックＭの脱水処理における脱水量と脱水時間との関係をプロットしたグラフである。 The Flock M was dehydrated with a Nutsche vacuum dehydrator to obtain about 20 g of dehydrated cake. The relationship between the amount of dehydration (ml) and the dehydration time (seconds) at this time was measured and is shown in FIG. FIG. 2 is a graph plotting the relationship between the amount of dehydration and the dehydration time in the dehydration process of Flock M.
［実施例２］
凝集剤の添加量の中で、有機系凝集剤Ｄの添加量を２０ｐｐｍと変えた以外は、実施例１と同様にして、フロックＭを生成させ、脱水量（ｍｌ）と脱水時間（秒）との関係を測定した。凝集剤の添加量を表１に、結果を、図２に各々示す。
[Example 2]
A floc M was generated in the same manner as in Example 1 except that the addition amount of the organic flocculant D was changed to 20 ppm in the addition amount of the flocculant, and the dehydration amount (ml) and the dehydration time (seconds). And the relationship was measured. The amount of flocculant added is shown in Table 1, and the results are shown in FIG.
［実施例３］
無機系凝集剤Ａを１０００ｐｐｍ、有機系凝集剤Ｂを２０ｐｐｍ、無機系凝集剤Ｃを２５０ｐｐｍ、有機系凝集剤Ｄを１０ｐｐｍ添加して、実施例１と同様にして、フロックＭを生成させ、脱水量（ｍｌ）と脱水時間（秒）との関係を測定した。凝集剤の添加量を表１に、結果を、図２に各々示す。
[Example 3]
Add 1000 ppm of inorganic flocculant A, 20 ppm of organic flocculant B, 250 ppm of inorganic flocculant C, and 10 ppm of organic flocculant D to produce floc M in the same manner as in Example 1. The relationship between volume (ml) and dehydration time (seconds) was measured. The amount of flocculant added is shown in Table 1, and the results are shown in FIG.
［比較例１］
実施例１と同量の懸濁水に、無機系凝集剤ＡであるＰＡＣを５００ｐｐｍ添加し、プロペラ型攪拌機で１分２００ｒｐｍで攪拌混合し、有機系凝集剤ＢであるＰＡ−３３１を５ｐｐｍを添加し、０．５分２０ｒｐｍで緩速攪拌してフロックＬを生成し、これを実施例１と同様に脱水処理した。凝集剤の添加量を表１に、フロックＬの脱水処理における脱水量（ｍｌ）と脱水時間（秒）との関係を、図２に各々示す。
[Comparative Example 1]
Add 500 ppm of PAC as inorganic flocculant A to the same amount of suspended water as in Example 1, stir and mix at 200 rpm for 1 minute with a propeller-type stirrer, and add 5 ppm of PA-331 as organic flocculant B Then, floc L was produced by gentle stirring at 20 rpm for 0.5 minutes, and this was dehydrated in the same manner as in Example 1. The amount of flocculant added is shown in Table 1, and the relationship between the amount of dehydration (ml) and the time of dehydration (seconds) in the dehydration treatment of floc L is shown in FIG.
［比較例２］
無機系凝集剤Ａを７５０ｐｐｍ、有機系凝集剤Ｂを１０ｐｐｍ添加した以外は、比較例１と同様にして、フロックＬを生成させ、脱水量（ｍｌ）と脱水時間（秒）との関係を測定した。凝集剤の添加量を表１に、結果を、図２に各々示す。
[Comparative Example 2]
Flock L was generated in the same manner as in Comparative Example 1 except that 750 ppm of inorganic flocculant A and 10 ppm of organic flocculant B were added, and the relationship between dewatering amount (ml) and dewatering time (seconds) was measured. did. The amount of flocculant added is shown in Table 1, and the results are shown in FIG.
図２の結果から、脱水量が１８０ｍｌに達するのに、比較例１では１７１秒、比較例２では２００秒かかったのが、実施例１では２４秒、実施例２では８３秒、実施例３では１０５秒であり、実施例１は比較例１〜２と比べ、脱水率が７〜８倍、実施例２〜３では比較例１〜２と比べ、１．７〜２．４倍向上したことがわかった。 From the results shown in FIG. 2, it took 171 seconds for Comparative Example 1 and 200 seconds for Comparative Example 2 to reach 180 ml, but it took 24 seconds for Example 1, 83 seconds for Example 2, and Example 3 In Example 1, the dehydration rate was 7 to 8 times that of Comparative Examples 1 and 2, and in Examples 2 to 3 was 1.7 to 2.4 times that of Comparative Examples 1 and 2. I understood it.
以上の結果から、本発明の濁水の凝集脱水処理方法によれば、フロックの脱水処理における脱水性が向上し、脱水時間を１．５倍以上短縮できることが確認された。 From the above results, it was confirmed that according to the turbid water coagulation dehydration method of the present invention, the dewaterability in the floc dewatering process was improved and the dehydration time could be shortened by 1.5 times or more.
Claims (4)
これに有機系凝集剤Ｂを添加し、緩速攪拌してフロックＬを生成し、
該フロックＬに無機系凝集剤Ｃを添加して攪拌混合し、前記フロックＬを分解又は破壊した後、
これを脱水処理することを特徴とする濁水の凝集脱水処理方法。 After adding the inorganic flocculant A to turbid water and stirring and mixing,
Add organic flocculant B to this and stir gently to produce floc L,
After adding the inorganic flocculant C to the floc L and stirring and mixing it, the floc L is decomposed or destroyed,
A method for coagulating and dehydrating muddy water, which comprises dehydrating the muddy water.
これに有機系凝集剤Ｄを添加し、緩速攪拌してフロックＭを生成し、
該フロックＭを脱水処理し、脱水ケーキを生成する請求項１に記載の濁水の凝集脱水処理方法。 After disassembling or destroying the floc L,
Add organic flocculant D to this and stir slowly to produce floc M,
The method for coagulating and dewatering muddy water according to claim 1, wherein the floc M is dehydrated to produce a dehydrated cake.
これに、さらに有機系凝集剤Ｆを添加し、緩速攪拌してフロックＮを生成し、
該フロックＮを脱水処理し、脱水ケーキを生成する請求項２に記載の濁水の凝集脱水処理方法。 After adding the inorganic flocculant E to the floc M and stirring and mixing it, the floc M is decomposed or destroyed,
To this, an organic flocculant F is further added, and the floc N is generated by gently stirring,
The method for coagulating and dewatering muddy water according to claim 2, wherein the floc N is dehydrated to form a dehydrated cake.
前記有機系凝集剤Ｂ、Ｄ、及びＦが、ポリアクリルアミド又はポリアクリル酸である請求項１〜３のいずれか一項に記載の濁水の凝集脱水処理方法。
The inorganic flocculants A, C, and E are at least one selected from the group consisting of aluminum sulfate, polyaluminum chloride, and iron salt;
The method for coagulating and dehydrating muddy water according to any one of claims 1 to 3, wherein the organic flocculants B, D, and F are polyacrylamide or polyacrylic acid.
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| JP2012135736A (en) * | 2010-12-27 | 2012-07-19 | Sumitomo Heavy Ind Ltd | Sludge dehydration system and sludge dehydration method |
| JP2015000389A (en) * | 2013-06-18 | 2015-01-05 | 水ｉｎｇ株式会社 | Sludge treatment method and device |
| JP2015003285A (en) * | 2013-06-19 | 2015-01-08 | 水ｉｎｇ株式会社 | Sludge treatment method and device |
| CN106242010A (en) * | 2016-08-31 | 2016-12-21 | 青川县俸佳硅矿有限责任公司 | A kind of washed-out sand sewage zero-discharge cycling and reutilization processes technique |
| JP2018161635A (en) * | 2017-03-27 | 2018-10-18 | 住友重機械エンバイロメント株式会社 | Flocculation and sedimentation treatment apparatus |
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| JP2012135736A (en) * | 2010-12-27 | 2012-07-19 | Sumitomo Heavy Ind Ltd | Sludge dehydration system and sludge dehydration method |
| JP2015000389A (en) * | 2013-06-18 | 2015-01-05 | 水ｉｎｇ株式会社 | Sludge treatment method and device |
| JP2015003285A (en) * | 2013-06-19 | 2015-01-08 | 水ｉｎｇ株式会社 | Sludge treatment method and device |
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