JP2934670B2 - Wastewater treatment method - Google Patents
Wastewater treatment methodInfo
- Publication number
- JP2934670B2 JP2934670B2 JP4359991A JP4359991A JP2934670B2 JP 2934670 B2 JP2934670 B2 JP 2934670B2 JP 4359991 A JP4359991 A JP 4359991A JP 4359991 A JP4359991 A JP 4359991A JP 2934670 B2 JP2934670 B2 JP 2934670B2
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- Japan
- Prior art keywords
- water
- ppm
- treatment
- treated water
- iron
- 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.)
- Expired - Fee Related
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Paper (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製紙工程において生成
する汚濁水の浄化処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying polluted water generated in a papermaking process.
【０００２】[0002]
【従来の技術】本発明において汚濁水とは、製紙工程に
おいて原料処理工程から排出するフィルター濾水、抄紙
工程から排出するワイヤー濾水（抄紙機の網下濾水）、
製紙工場より排出される排水などを総称したものであ
る。2. Description of the Related Art In the present invention, polluted water refers to filtered water discharged from a raw material processing step in a paper making step, wire filtered water discharged from a paper making step (under-net drainage of a paper machine),
It is a generic term for wastewater discharged from paper mills.
【０００３】製紙汚濁水中には、微細な繊維質物の外
に、鉱物、コーティング剤、サイズ剤、インキ、顔料、
木材樹脂、粘着物などを含有している。そしてこの汚濁
水の一般的処理方法としては、活性汚泥法、凝集沈殿分
離法などが行われ、スラッジと処理水に分離され、処理
水は水質基準値に合格する値で排出されるか、あるいは
一部高度に処理されたものは、工程水として再度循環使
用される。また積極的に用水を循環使用するクローズド
系原料処理工程においては、水質によるパルプの汚染、
スケール、スライム、ピッチ、粘着物の発生、装置の腐
食などを防止するために、白水に凝集剤、気泡剤などを
添加し、空気を吹込み、懸濁汚質物を気泡に付着させて
浮上選別する処理方法が実施されている。あるいはま
た、空気を含んだ加圧水を吹込み、発生する気泡に懸濁
物質を付着させて浮上選別する処理方法（加圧浮上選別
法）も実施されている。特に後者は設備費が少なく、広
範囲な水質要求に対応できるために普及している。上記
各処理において重要な要素は凝集剤の選択にある。[0003] In paper contaminated water, in addition to fine fibrous materials, minerals, coating agents, sizing agents, inks, pigments,
Contains wood resin, adhesives, etc. And as a general treatment method of this polluted water, an activated sludge method, a coagulation sedimentation separation method, etc. are performed, separated into sludge and treated water, and the treated water is discharged at a value that passes the water quality standard value, or Some of the highly treated products are recycled again as process water. In addition, in the closed raw material treatment process where water is actively circulated, pulp contamination due to water quality,
In order to prevent scale, slime, pitch, sticky substances, corrosion of equipment, etc., a flocculant, a foaming agent, etc. are added to white water, air is blown, and suspended contaminants are attached to the bubbles to float and sort. A processing method has been implemented. Alternatively, a processing method in which pressurized water containing air is blown and a suspended substance is attached to generated bubbles to perform flotation sorting (press flotation sorting method) has also been implemented. In particular, the latter is popular because it requires less equipment costs and can meet a wide range of water quality requirements. An important factor in each of the above treatments is the choice of flocculant.
【０００４】一般的な凝集剤としては、凝集沈殿法には
硫酸アルミニウム、ポリ塩化アルミニウム、硫酸鉄、塩
化鉄、高分子凝集剤などが使用され、凝集浮上法には硫
酸アルミニウム、ポリ塩化アルミニウム、高分子凝集剤
などが使用される。また、本発明者等は、凝集沈殿およ
び凝集浮上処理用の効果的な凝集剤として、モンモリロ
ナイト系粘土鉱物と陽イオン界面活性剤の併用処理を報
告している（特願平1-257089）。As a general flocculant, aluminum sulfate, polyaluminum chloride, iron sulfate, iron chloride, a polymer flocculant and the like are used in the flocculation and precipitation method, and aluminum sulfate, polyaluminum chloride and the like are used in the flocculation and floating method. A polymer flocculant is used. In addition, the present inventors have reported a combined use of a montmorillonite-based clay mineral and a cationic surfactant as an effective coagulant for coagulation sedimentation and coagulation flotation treatment (Japanese Patent Application No. 1-257089).
【０００５】[0005]
【発明が解決しようとする課題】製紙汚濁水は、一般に
種々のアニオン性汚質物質が溶存し、これらを除去する
には多くの陽イオン性凝集剤を必要とする。しかし、陽
イオン性凝集剤（特に陽イオン性高分子凝集剤）は陰イ
オン性および非イオン性のものに比べて高価であるた
め、処理費の増加は避けられない。モンモリロナイト系
粘土鉱物と陽イオン界面活性剤との併用処理についても
同様に、高度な処理効果をもたらす反面、陽イオン性界
面活性剤の価格が比較的高いために、使用量の増加にと
もなって処理価格の上昇は避けられなかった。すなわ
ち、薬品添加量の削減はこのシステムを採用する上では
最重要課題であった。他方、一般的な凝集剤は処理水中
に幾分残留するが、このことは処理水を再度循環使用す
る際に問題となる。特に鉄化合物では処理水中に鉄イオ
ンが残留するために、処理水を製紙工程水に循環再使用
することは困難であった。すなわち、鉄はパルプに強く
吸着されパルプや紙を変色させる。また、過酸化物漂白
剤の分解を促進し、セルロースのアルカリ性での酸化分
解を加速する。鉄バクテリアの繁殖を促しスライムトラ
ブルの原因ともなる。処理水中に鉄が残留することは以
上のような問題を引起す。また、ポリエチレンイミンが
処理水に残留すると、古紙処理工程においてパルプの洗
浄効率を低下させるとの報告もある。本発明は以上のこ
とに鑑み、これらの欠点を改善することを主たる目的と
するものである。In general, various anionic fouling substances are dissolved in papermaking polluted water, and a large amount of a cationic coagulant is required to remove them. However, cationic flocculants (especially cationic polymeric flocculants) are more expensive than anionic and nonionic flocculants, so that an increase in processing costs is inevitable. Similarly, the combination treatment of a montmorillonite clay mineral and a cationic surfactant provides a high level of treatment effect, but the treatment cost increases due to the relatively high price of the cationic surfactant. Rising prices were inevitable. In other words, reducing the amount of chemicals added was the most important issue when employing this system. On the other hand, some common flocculants remain in the treated water, which is problematic when the treated water is recycled. Particularly, in the case of iron compounds, since iron ions remain in the treated water, it has been difficult to circulate and reuse the treated water as the papermaking process water. That is, iron is strongly adsorbed to pulp and discolors pulp and paper. It also promotes the decomposition of the peroxide bleach and accelerates the oxidative decomposition of cellulose in alkaline conditions. It promotes the growth of iron bacteria and causes slime trouble. The residual iron in the treated water causes the above problems. In addition, there is a report that if polyethyleneimine remains in the treated water, the washing efficiency of pulp is reduced in the used paper processing step. In view of the above, the present invention has as its main object to improve these disadvantages.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成すべく鋭
意研究を重ねた結果、前以て比較的安価な凝集剤（一次
凝集剤）により凝集処理を行った後、この処理水に陽イ
オン界面活性剤とモンモリロナイトを主成分とする粘土
鉱物を添加して二次凝集処理を行うことにより、高価な
薬品使用量を削減させることができ、また処理効果の向
上および凝集剤残留量の低下が得られることを見いだし
本発明を完成した。すなわち本発明は、製紙汚濁水の処
理方法において、製紙汚濁水をあらかじめ一次凝集処理
を行い、次いでモンモリロナイト系粘土鉱物と陽イオン
性界面活性剤を添加して二次凝集処理を行うことを特徴
とする、製紙汚濁水の処理方法を提供するものである。Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, as a result of performing a flocculation treatment with a relatively inexpensive flocculant (primary flocculant) in advance, the cation is added to the treated water. By adding a surfactant and a clay mineral mainly composed of montmorillonite to perform the secondary flocculation treatment, it is possible to reduce the amount of expensive chemicals used, and to improve the treatment effect and decrease the residual flocculant amount. The inventors have found that the present invention has been completed and completed the present invention. That is, the present invention provides a method for treating paper-contaminated water, wherein the paper-contaminated water is subjected to a primary flocculation treatment in advance, and then subjected to a secondary flocculation treatment by adding a montmorillonite-based clay mineral and a cationic surfactant. To provide a method for treating paper contaminated water.
【０００７】以下本発明を具体的に説明する。 （一次凝集）本発明においては、まず製紙汚濁水に一次
凝集剤を添加して、凝集前処理を行う。処理の方法は通
常行われる前処理の方法でよく、例えば凝集沈澱あるい
は加圧浮上等の方法がある。使用される一次凝集剤とし
ては、鉄化合物（例えば硫酸第二鉄、硫酸第一鉄、塩化
第二鉄、塩化コッパラス、硫酸第一鉄、硫酸第二鉄な
ど）、アルミニウム化合物（例えば硫酸バンド、ポリ塩
化アルミニウムなど）、ポリエチレンイミンなどであ
る。Hereinafter, the present invention will be described specifically. (Primary Coagulation) In the present invention, first, a primary coagulant is added to papermaking contaminated water to perform pre-coagulation treatment. The treatment may be carried out by a conventional pretreatment, such as coagulation sedimentation or flotation under pressure. Examples of the primary flocculant used include iron compounds (eg, ferric sulfate, ferrous sulfate, ferric chloride, copper chloride, ferrous sulfate, ferric sulfate, etc.), and aluminum compounds (eg, sulfate band, Polyaluminum chloride), polyethyleneimine and the like.
【０００８】（二次凝集）一次凝集処理した処理水に、
二次凝集剤としての粘土鉱物および陽イオン性界面活性
剤を添加して二次凝集を行う。二次凝集剤として使用さ
れる代表的な粘土鉱物には、おもにモンモリロナイト系
粘土鉱物あるいはカオリナイト系粘土鉱物、セピオライ
ト、アロフェンなどがあるが、本発明に用いる粘土鉱物
はモンモリロナイトを主成分とし、化学式Ａl2Ｏ3・４
ＳiＯ2・Ｈ2（このＨ2はＮa、Ｋ、Ｃa、Ｍgなどと交換
可能である）で表される鉱物で、具体的にはモンモリロ
ナイト、ベントナイト（交換イオンが主にＮa、Ｃaであ
るもの）、酸性白土（交換イオンの一部がＨ+であるも
の）などが挙げられる。ただし、天然の粘土鉱物では少
量のその他の金属（例えばＦe、Ｍnなど）を含んでい
る。二次凝集剤として使用される陽イオン界面活性剤と
しては、脂肪族系のアミンおよびその塩あるいは脂肪族
系の４級アンモニウム塩などで、具体的にはアミンでは
ステアリルアミン、セチルアミン、ラウリルアミン、
Ｎ,Ｎ−ジメチル−ステアリルアミン、Ｎ,Ｎ−ジメチル
−セチルアミン、Ｎ,Ｎ−ジメチル−テトラデシルアミ
ン、Ｎ,Ｎ−ジメチル−ラウリルアミン、Ｎ−メチル−
ステアリルアミン、Ｎ−メチル−セチルアミン、ジオク
チルアミン、ジラウリルアミンなどおよびそれらの混合
物、４級アンモニウム塩ではステアリルトリメチルアン
モニウム塩、セチルトリメチルアンモニウム塩、テトラ
デシルトリメチルアンモニウム塩、ラウリルトリメチル
アンモニウム塩、ジデシルジメチルアンモニウム塩、ジ
ラウリルジメチルアンモニウム塩、ジセチルジメチルア
ンモニウム塩、ジステアリルジメチルアンモニウム塩な
どおよびそれらの混合物が挙げられる。 （凝集剤の添加量）上記の一次凝集剤を汚濁水に所定量
添加して凝集沈殿を行う。処理水に更に所定量の粘土鉱
物と陽イオン界面活性剤を加えて生じた凝集体を、分離
処理で清澄水と分離する。各添加剤の使用量は汚濁水の
汚濁の程度に依存するが、一般に、一次凝集剤は１ppm
〜１０００ppm（対汚濁水）、粘土鉱物は１〜１０００p
pm（対処理水）、陽イオン界面活性剤は０.０１〜１０
０ppm（対処理水）程度を添加するのが好ましい。一般
に上記の一次凝集剤による凝集処理では沈降あるいは浮
上速度を速めるために、０.１〜１０ppm程度の高分子凝
集剤（例えばポリアクリアミド、ポリアクリルエステル
系ポリマーなど）が併用される。当然のことながら、当
発明においてもこれら高分子凝集剤を一次凝集剤に併用
することは可能である。(Secondary aggregation)
Secondary aggregation is performed by adding a clay mineral and a cationic surfactant as a secondary aggregation agent. Representative clay minerals used as secondary flocculants include montmorillonite-based clay minerals or kaolinite-based clay minerals, sepiolite, allophane, etc. Al 2 O 3・ 4
A mineral represented by SiO 2 · H 2 (H 2 can be exchanged for Na, K, Ca, Mg, etc.), specifically, montmorillonite, bentonite (exchanged ions are mainly Na and Ca) ), Acid clay (one in which some of the exchange ions are H + ), and the like. However, natural clay minerals contain small amounts of other metals (eg, Fe, Mn, etc.). Examples of the cationic surfactant used as the secondary flocculant include aliphatic amines and salts thereof, and aliphatic quaternary ammonium salts. Specifically, amines include stearylamine, cetylamine, laurylamine, and the like.
N, N-dimethyl-stearylamine, N, N-dimethyl-cetylamine, N, N-dimethyl-tetradecylamine, N, N-dimethyl-laurylamine, N-methyl-
Stearylamine, N-methyl-cetylamine, dioctylamine, dilaurylamine and the like, and mixtures thereof. For quaternary ammonium salts, stearyltrimethylammonium salt, cetyltrimethylammonium salt, tetradecyltrimethylammonium salt, lauryltrimethylammonium salt, didecyldimethyl Ammonium salts, dilauryl dimethyl ammonium salts, dicetyl dimethyl ammonium salts, distearyl dimethyl ammonium salts and the like, and mixtures thereof. (Amount of Coagulant Added) A predetermined amount of the above-mentioned primary coagulant is added to the contaminated water to perform coagulation precipitation. An aggregate formed by further adding a predetermined amount of a clay mineral and a cationic surfactant to the treated water is separated from the clarified water by a separation treatment. The amount of each additive used depends on the degree of contamination of the polluted water.
~ 1000ppm (with respect to polluted water), clay minerals 1 ~ 1000p
pm (to treated water), cationic surfactant is 0.01-10
It is preferable to add about 0 ppm (relative to treated water). Generally, in the coagulation treatment using the primary coagulant, a polymer coagulant (for example, polyacrylamide, polyacrylester-based polymer, etc.) of about 0.1 to 10 ppm is used in combination to increase the sedimentation or floating speed. As a matter of course, in the present invention, it is possible to use these polymer flocculants in combination with the primary flocculants.
【０００９】以下、本発明を実施例をもとに説明する。Hereinafter, the present invention will be described based on embodiments.
【実施例】（使用白水）本実施例で用いた白水は古紙離
解後のフィルター濾水（汚濁水１）、製紙排水（汚濁水
２）である。それぞれのＳＳ（Suspended Solid）量、
ＣＯＤ(ChemicalOxgen Demand）を表１に示す。EXAMPLES (Used White Water) The white water used in this example is the filtered water (polluted water 1) and the papermaking drainage (polluted water 2) after the disintegration of the used paper. SS (Suspended Solid) amount,
Table 1 shows COD (Chemical Oxgen Demand).
【００１０】 [0010]
【００１１】比較例 １ 上記の汚濁水１にベントナイト１２００ppmとステアリ
ルトリメチルアンモニウムクロリド５０ppm添加してpＨ
５に調節した後、加圧浮上処理を行った。処理水のＣＯ
Ｄは１０２ppmであった。 Comparative Example 1 1200 ppm of bentonite and 50 ppm of stearyltrimethylammonium chloride were added to the above-mentioned contaminated water 1 to adjust the pH.
After adjusting the pressure to 5, pressure flotation treatment was performed. CO of treated water
D was 102 ppm.
【００１２】比較例 ２ 汚濁水１にベントナイト１２００ppmとステアリルトリ
メチルアンモニウムクロリド１００ppm添加してpＨ５に
調節した後、加圧浮上処理を行った。処理水のＣＯＤは
７０ppmであった。 Comparative Example 2 1200 ppm of bentonite and 100 ppm of stearyltrimethylammonium chloride were added to polluted water 1 to adjust the pH to 5, and then subjected to a pressure flotation treatment. The COD of the treated water was 70 ppm.
【００１３】実施例 １ 汚濁水１に硫酸第一鉄を４００ppm添加してpＨを５.０
に調節した。３０分放置後、処理水（上澄み）を取り出
し、そのＣＯＤおよびフェナントロリン法による鉄の定
量を行った。処理水のＣＯＤは７５ppm、鉄濃度は２.１
ppmであった。この処理水にベントナイト１００ppm、ス
テアリルトリメチルアンモニウムクロリド５ppm添加し
て加圧浮上処理を行うと、処理水のＣＯＤは６５ppm、
鉄濃度は０.３ppmとなった。比較例２と比べると同等の
処理効果を得るのに粘土鉱物と陽イオン界面活性剤の使
用量は１／１０以下に減少した。特に後者では１／２０
で充分であった。処理水中の鉄濃度に関しても水道水中
の鉄濃度が０.１ppmであることを考えれば極めて低い濃
度であることがわかる。処理水のＳＳ量は鉄化合物によ
る凝集沈殿処理のみで極めて微量になった。 EXAMPLE 1 400 ppm of ferrous sulfate was added to polluted water 1 to adjust the pH to 5.0.
Was adjusted to After standing for 30 minutes, the treated water (supernatant) was taken out, and its COD and iron were determined by the phenanthroline method. COD of treated water is 75ppm, iron concentration is 2.1
ppm. When 100 ppm of bentonite and 5 ppm of stearyltrimethylammonium chloride are added to the treated water and subjected to pressure flotation, the COD of the treated water is 65 ppm,
The iron concentration was 0.3 ppm. In order to obtain the same treatment effect as in Comparative Example 2, the amounts of the clay mineral and the cationic surfactant used were reduced to 1/10 or less. Especially in the latter, 1/20
Was sufficient. Regarding the iron concentration in the treated water, it can be seen that the concentration is extremely low in view of the fact that the iron concentration in the tap water is 0.1 ppm. The SS amount of the treated water became extremely small only by the coagulation precipitation treatment with the iron compound.
【００１４】実施例 ２ 汚濁水１に硫酸第一鉄を４００ppm添加してpＨ７.０に
調節し、実施例１と同様の操作を行った。処理水のＣＯ
Ｄは９０ppm、鉄濃度は６.０ppmであった。この処理水
にベントナイト１００ppm、ステアリルトリメチルアン
モニウムクロリド５ppm添加して加圧浮上処理を行う
と、処理水のＣＯＤは７０ppm、鉄濃度は０.３ppmとな
った。 Example 2 The same operation as in Example 1 was performed by adding 400 ppm of ferrous sulfate to the polluted water 1 and adjusting the pH to 7.0. CO of treated water
D was 90 ppm and iron concentration was 6.0 ppm. When 100 ppm of bentonite and 5 ppm of stearyltrimethylammonium chloride were added to the treated water and subjected to pressure flotation, the COD of the treated water was 70 ppm and the iron concentration was 0.3 ppm.
【００１５】実施例 ３ 汚濁水１に塩化第二鉄を３００ppm添加して実施例１と
同様の操作を行った。処理水のＣＯＤは８５ppm、鉄濃
度は４.５ppmであった。この処理水にベントナイト１０
０ppm、ステアリルトリメチルアンモニウムクロリド５p
pm添加して加圧浮上処理を行うと、処理水のＣＯＤは７
０ppm、鉄濃度は０.２ppmとなった。 Example 3 The same operation as in Example 1 was performed by adding 300 ppm of ferric chloride to the polluted water 1. The COD of the treated water was 85 ppm, and the iron concentration was 4.5 ppm. Bentonite 10
0 ppm, stearyltrimethylammonium chloride 5p
pm addition and pressure flotation treatment, COD of treated water is 7
0 ppm and the iron concentration were 0.2 ppm.
【００１６】実施例 ４ 汚濁水１に塩化第二鉄を３００ppm添加して実施例１と
同様の操作を行った。処理水にベントナイト５００pp
m、ステアリルトリメチルアンモニウムクロリド２５ppm
添加して加圧浮上処理を行うと、処理水のＣＯＤは６８
ppm、鉄濃度は０.２ppmとなった。 Example 4 The same operation as in Example 1 was performed by adding 300 ppm of ferric chloride to the polluted water 1. Bentonite 500pp in treated water
m, stearyltrimethylammonium chloride 25ppm
When added and subjected to pressure flotation, the COD of the treated water is 68
ppm and iron concentration were 0.2 ppm.
【００１７】実施例 ５ 汚濁水１に塩化第二鉄３００ppm添加して実施例１と同
様の操作を行った。処理水にモンモリロナイト５０pp
m、ジメチルステアリルアミン塩酸塩５ppm添加して加圧
浮上処理を行うと、処理水のＣＯＤは６５ppm、鉄濃度
は０.２ppmであった。 Example 5 The same operation as in Example 1 was performed by adding 300 ppm of ferric chloride to the polluted water 1. Montmorillonite 50pp in treated water
m, when dimethylstearylamine hydrochloride (5 ppm) was added and pressure flotation was performed, the COD of the treated water was 65 ppm and the iron concentration was 0.2 ppm.
【００１８】実施例 ６ 汚濁水２に塩化第一鉄を１００ppm添加して実施例１と
同様の操作を行った。処理水のＣＯＤは３０ppm、鉄濃
度は１.９ppmであった。この処理水にベントナイト１０
０ppm、ステアリルトリメチルアンモニウムクロリド５p
pm添加して加圧浮上処理を行うと、処理水のＣＯＤは２
５ppm、鉄濃度は０.２ppmとなった。 Example 6 The same operation as in Example 1 was performed by adding 100 ppm of ferrous chloride to the polluted water 2. The COD of the treated water was 30 ppm, and the iron concentration was 1.9 ppm. Bentonite 10
0 ppm, stearyltrimethylammonium chloride 5p
pm addition and pressure flotation treatment, COD of treated water is 2
The concentration of iron was 5 ppm, and the concentration of iron was 0.2 ppm.
【００１９】実施例 ７ 汚濁水１に硫酸バンド３００ppm添加してpＨ４.５に調
節した。３０分間放置後、処理水（上澄み）を取り出
し、そのＣＯＤおよび８−キノリノール法によるアルミ
ニウムの定量を行った。処理水のＣＯＤは１１０ppm、
アルミニウム濃度は２２.１ppmであった。この処理水に
ベントナイト１００ppm、ステアリルトリメチルアンモ
ニウムクロリド５ppm添加して加圧浮上処理を行うと、
処理水のＣＯＤは７５ppm、アルミニウム濃度は９.４pp
mとなった。 Example 7 The pH of the polluted water 1 was adjusted to 4.5 by adding 300 ppm of a sulfuric acid band. After standing for 30 minutes, the treated water (supernatant) was taken out, and its COD and aluminum were quantified by the 8-quinolinol method. COD of treated water is 110ppm,
The aluminum concentration was 22.1 ppm. When 100 ppm of bentonite and 5 ppm of stearyltrimethylammonium chloride are added to the treated water and subjected to pressure flotation,
COD of treated water is 75ppm, aluminum concentration is 9.4pp
m.
【００２０】[0020]
【発明の効果】以上説明したように汚濁水を一次凝集剤
で凝集処理を行った後、陽イオン性界面活性剤とモンモ
リロナイトを主成分とする粘土鉱物を処理水に添加し、
二次凝集処理を行うことによって、処理用の薬品消費量
が大幅に削減でき、ひいては処理薬品コストの低下がも
たらされる。さらに、汚濁水の浄化効果が高く、処理水
中に残留する凝集剤の濃度が極めて低いので、再度循環
水として使用することが可能となった。As described above, after the polluted water is subjected to coagulation treatment with the primary coagulant, a cationic surfactant and a clay mineral mainly composed of montmorillonite are added to the treated water.
By performing the secondary flocculation treatment, the consumption of the treatment chemicals can be significantly reduced, and the treatment chemical cost can be reduced. Furthermore, since the purification effect of the polluted water is high and the concentration of the coagulant remaining in the treated water is extremely low, it can be used again as circulating water.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) D21F 1/66 - 1/82 C02F 1/52 - 1/56 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) D21F 1/66-1/82 C02F 1/52-1/56
Claims (3)
濁水をあらかじめ一次凝集処理を行い、次いでモンモリ
ロナイト系粘土鉱物と陽イオン性界面活性剤を添加して
二次凝集処理を行うことを特徴とする、製紙汚濁水の処
理方法。1. A method for treating papermaking contaminated water, which comprises subjecting papermaking contaminated water to a primary flocculation treatment in advance, and then adding a montmorillonite clay mineral and a cationic surfactant to perform a secondary flocculation treatment. , A method for treating paper polluted water.
理を行うことを特徴とする、請求項１に記載の製紙汚濁
水の処理方法。2. The method according to claim 1, wherein the primary coagulation treatment is performed using an iron compound-based coagulant.
り得られた処理水を製紙工程水として再使用することを
特徴とする循環水の製造方法。3. A method for producing circulating water, wherein the treated water obtained by the treatment method according to claim 1 or 2 is reused as papermaking process water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4359991A JP2934670B2 (en) | 1991-03-08 | 1991-03-08 | Wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4359991A JP2934670B2 (en) | 1991-03-08 | 1991-03-08 | Wastewater treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04281091A JPH04281091A (en) | 1992-10-06 |
| JP2934670B2 true JP2934670B2 (en) | 1999-08-16 |
Family
ID=12668280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4359991A Expired - Fee Related JP2934670B2 (en) | 1991-03-08 | 1991-03-08 | Wastewater treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2934670B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366547C (en) * | 2005-10-01 | 2008-02-06 | 戴福寿 | Production of water-purifying agent for papermaking sewage |
-
1991
- 1991-03-08 JP JP4359991A patent/JP2934670B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366547C (en) * | 2005-10-01 | 2008-02-06 | 戴福寿 | Production of water-purifying agent for papermaking sewage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04281091A (en) | 1992-10-06 |
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