JP2834492B2 - Papermaking white water treatment method - Google Patents
Papermaking white water treatment methodInfo
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- JP2834492B2 JP2834492B2 JP25708989A JP25708989A JP2834492B2 JP 2834492 B2 JP2834492 B2 JP 2834492B2 JP 25708989 A JP25708989 A JP 25708989A JP 25708989 A JP25708989 A JP 25708989A JP 2834492 B2 JP2834492 B2 JP 2834492B2
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- white water
- treatment
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- ppm
- cationic surfactant
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、製紙工程において排出される白水の処理方
法に関するものである。さらに詳しくは製紙工程から排
出される白水から凝集沈澱分離法または浮上選別法によ
り繊維質物ならびに非繊維質物を回収除去することによ
り、用水を循環使用する白水の処理方法に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a method for treating white water discharged in a papermaking process. More specifically, the present invention relates to a method for treating white water by circulating and using water by collecting and removing fibrous materials and non-fibrous materials from white water discharged from a papermaking process by a coagulation sedimentation separation method or a flotation separation method.
本発明において白水とは、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水および抄紙工程から排
出するワイヤー水（抄紙機の網下水）などを総称し
たものである。製紙工程においては、多量の白水が排出
されるが、この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
物などの原料処理工程からくる汚質物質を含有してい
る。そしてこの白水の一般的処理方法としては、従来、
活性汚泥法、凝集沈澱分離法などが行われ、スラッジと
排水に分離され、排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排水は、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では、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、空気を吹込み発生する気泡に懸濁
汚質物を付着させて、浮上選別する処理方法が実施され
ている。または空気を含んだ加圧水を吹込み懸濁物質を
発生する気泡に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。In the present invention, white water is a general term for filter water discharged from a raw material processing step and wire water (mesh sewage of a paper machine) discharged from a paper making step in a paper making step. In the papermaking process, a large amount of white water is discharged. In addition to fine fibrous materials, there is contamination from the raw material processing process such as minerals, coating agents, sizing agents, inks, pigments, wood resins, and adhesives. Substance. And as a general treatment method of this white water,
Activated sludge method, coagulation sedimentation separation method, etc. are performed and separated into sludge and wastewater, and the wastewater is discharged at a value that passes the water quality standard value, or the wastewater that has been partially treated to a high degree is reused as process water. Used for circulation. In addition, in the closed raw material treatment process where water is actively circulated, in order to prevent pulp contamination by water quality, scale, slime, pitch, sticky substances, corrosion of equipment, etc.
A processing method of adding a foaming agent or the like, adhering suspended contaminants to bubbles generated by blowing air, and performing flotation sorting has been practiced. Alternatively, a processing method in which air is pressurized and water is blown into the air to generate suspended solids and attached to the air bubbles to perform flotation sorting (press flotation sorting method) is also practiced. In particular, the latter is popular because it requires less equipment costs and can meet a wide range of water quality requirements.
前述のような凝集沈澱法もしくは浮上選別法で最適な
処理効果を得るためには、最適な凝集剤もしくは気泡剤
を選別することが最も重要である。上記の凝集沈澱分離
法あるいは浮上選別法で用いられる一般的な凝集剤は、
硫酸アルミニウム（アラム）、陰イオン性、非イオン
性、陽イオン性の高分子、ある種の鉱物などが単独でも
しくは併用して用いられる。In order to obtain an optimum treatment effect by the coagulation sedimentation method or the flotation separation method as described above, it is most important to select an optimum coagulant or foaming agent. Common flocculants used in the above flocculation sedimentation separation method or flotation separation method are:
Aluminum sulfate (alum), anionic, nonionic, cationic polymers, certain minerals and the like are used alone or in combination.
しかし、従来の薬品では使用条件の範囲が狭い（特に
pHなど）、効果が充分でない、あるいは処理法によって
薬品の選択を行う必要があるなどの問題があった。However, conventional chemicals have a narrow range of use conditions (especially
pH), the effect is not sufficient, or it is necessary to select a chemical depending on the treatment method.
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。In view of the above, the present invention has as its main object to improve these disadvantages.
すなわち本発明は、製紙白水に４級アンモニウム基を
有する陽イオン性界面活性剤とモンモリロナイトを主成
分とする粘土鉱物とを添加し、汚濁物質を分離除去する
ことを特徴とする、製紙白水の処理方法を提供するもの
である。That is, the present invention provides a method for treating papermaking white water, comprising adding a cationic surfactant having a quaternary ammonium group to a papermaking whitewater and a clay mineral containing montmorillonite as a main component to separate and remove pollutants. It provides a method.
このことによって、凝集沈澱処理および上選別処理の
両者に適し、広範な条件に適用可能で著しい効果を発現
することを見いだし、本発明を完成した。As a result, the present inventors have found that the present invention is suitable for both the coagulation sedimentation treatment and the upper selection treatment, can be applied to a wide range of conditions, and exhibits a remarkable effect, thereby completing the present invention.
以下、本発明を具体的に説明する。 Hereinafter, the present invention will be described specifically.
本発明で使用される４級アンモニウム基を有する界面
活性剤としては、直鎖または有枝の長鎖炭化水素化基を
１つまたは２つ有するアンモニウム塩で、一般に次の化
学式で表されるものをさす。The surfactant having a quaternary ammonium group used in the present invention is an ammonium salt having one or two linear or branched long-chain hydrocarbon groups, generally represented by the following chemical formula: Point out.
ここでＲおよびＲ′は、同一または異なった長鎖の炭
化水素基を示し、炭素水８〜20が好ましい。例えばオク
チル、デシル、ドデシル、セチル、ステアリル等が通常
使用される。Ｒ″で示す窒素に結合している長鎖炭化水
素基以外の基としては、低級炭化水素基、例えばメチ
ル、エチル、あるいはプロピル、ブチル等の基であって
もよい。X-は、４級アンモニウムの対イオンであり、例
えばハロゲン（F-,Cl-,Br-,I-）、NO3 -,CH3COO-,HSO4 -
などが挙げられる。 Here, R and R 'represent the same or different long-chain hydrocarbon groups, and preferably 8 to 20 carbon water. For example, octyl, decyl, dodecyl, cetyl, stearyl and the like are usually used. The group other than the long-chain hydrocarbon group attached to the nitrogen indicated by R ", lower hydrocarbon group, for example good methyl, ethyl, or propyl, be a group of butyl .X - is quaternary is a counterion of ammonium such as halogen (F -, Cl -, Br -, I -), NO 3 -, CH 3 COO -, HSO 4 -
And the like.
その他のアンモニウム塩としては、上記のＲまたは
Ｒ′で示される長鎖の炭化水素基を有するピリジニウム
塩、ベンジル基を有するベンザルコニウム塩等も挙げる
ことができる。Examples of other ammonium salts include a pyridinium salt having a long-chain hydrocarbon group represented by R or R ', and a benzalkonium salt having a benzyl group.
これらの陽イオン性の界面活性剤を所定量添加した
後、所定量の粘土鉱物を加えて生じた凝集体を、凝集沈
澱分離もしくは浮上選別分離処理で清澄水と分離する。
この場合、陽イオン性界面活性剤と粘土鉱物の添加順序
はどちらを先に用いても構わないし、同時であってもよ
い。After adding a predetermined amount of these cationic surfactants, an aggregate formed by adding a predetermined amount of clay mineral is separated from clear water by coagulation sedimentation separation or flotation separation treatment.
In this case, the cationic surfactant and the clay mineral may be added in any order, or may be added simultaneously.
代表的な粘土鉱物としては、おもにモンモリロナイト
系粘土鉱物と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・4SiO2・
H2（このH2はNa,K,Ca,Mg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。Representative clay minerals are mainly montmorillonite clay minerals and kaolinite clay minerals, sepiolite,
There are allophane and the like, but the clay mineral used in the present invention is:
Montmorillonite as a main component, chemical formula Al 2 O 3・ 4SiO 2・
A mineral represented by H 2 (this H 2 is interchangeable with Na, K, Ca, Mg), specifically montmorillonite, bentonite (exchanged ions are mainly Na, Ca), acid clay (In which some of the exchange ions are H + ).
陽イオン性界面活性剤の添加量は白水の汚濁度、汚濁
物質の質によっても異なるが、通常は10〜10,000ppm、
好ましくは100〜1,000ppmである。The amount of the cationic surfactant to be added depends on the turbidity of the white water and the quality of the pollutants, but is usually 10 to 10,000 ppm,
Preferably it is 100 to 1,000 ppm.
粘土鉱物は、陽イオン性界面活性剤の量の1/5〜100
倍、好ましくは２〜10倍である。Clay minerals are 1/5 to 100 of the amount of cationic surfactant
2 times, preferably 2 to 10 times.
一般に白水中の成分は負に帯電しており、陽イオン性
界面活性剤の添加量は、白水のカチオン要求量（白水中
のゼータ電位を０にするために要するカチオンの量）の
25％以上が好ましい。陽イオン性界面活性剤が等電点に
達する量の125％以上で使用される時は、ベントナイト
使用量を少なくとも陽イオン性界面活性剤の量の２倍以
上用いるのが好ましい。Generally, the components in the white water are negatively charged, and the amount of the cationic surfactant to be added is determined by the amount of the cation required for the white water (the amount of the cation required to reduce the zeta potential in the white water to zero).
25% or more is preferable. When the cationic surfactant is used at 125% or more of the amount that reaches the isoelectric point, it is preferable to use bentonite at least twice the amount of the cationic surfactant.
陽イオン性界面活性剤の量が、上記カチオン要求量の
25％以下であると所期の分離効果が得られない。また逆
にこの量がカチオン要求量の125％以上になっても、効
果が比例的に大きくなるわけではなく、コスト的に不利
となる。When the amount of the cationic surfactant is equal to the above-mentioned cation demand amount,
If it is less than 25%, the desired separation effect cannot be obtained. Conversely, even if this amount exceeds 125% of the cation requirement, the effect is not proportionally increased, and the cost is disadvantageous.
以下、実施例により本発明をさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
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
水（白水１）、古紙処理工程の浮上脱墨後のフィルター
水（白水２）、ブナ材クラフトパルプの蒸解後の洗浄
水（白水３）である。各々の組成を表１に示す。White water used White water used in this example was filter water after white paper disintegration (white water 1), filter water after floating deinking in the waste paper treatment process (white water 2), and washing water after digestion of beech wood kraft pulp (white water). 3). Table 1 shows the respective compositions.
実施例１ 白水１にステアリルトリメチルアンモニウムクロライ
ド（STMAC）を880ppm（カチオン要求量と等量）とベン
トナイトを4000ppm加えて、pH3〜11.0の間の所定値に調
節して、凝集沈澱処理および加圧浮上選別処理をそれぞ
れ行った。清澄水を採取して、それぞれの紫外域の280n
mの吸光度を測定した。通常の濁度測定に使用する可視
域で測定しなかったのは、より細かい溶存物質の除去効
果も併せて測定するためである。処理による効果は、未
処理の吸光度を100とし、処理水の吸光度の減少率
（％）で表した。表２に結果を示す。 Example 1 880 ppm (equivalent to the required amount of cation) of stearyltrimethylammonium chloride (STMAC) and 4000 ppm of bentonite were added to white water 1 to adjust the pH to a predetermined value between 3 and 11.0, and the mixture was subjected to coagulation sedimentation treatment and pressure flotation. Each of the sorting processes was performed. Collect clarified water, 280n of each ultraviolet region
m was measured. The reason why the measurement was not performed in the visible region used for the normal turbidity measurement is that the effect of removing finer dissolved substances is also measured. The effect of the treatment was expressed as a decrease (%) in the absorbance of the treated water, with the untreated absorbance as 100. Table 2 shows the results.
加圧浮上処理においては、空気をコンプレッサーで吹
込みながら圧力4kg/cm2に調節した加圧水を白水に対し
て1/3量加え、５分後の清澄水を吸光度測定の試料とし
た。微酸性状態では85％以上の極めて高い処理効果が得
られ、pH11.0でも75％以上の極めて高い処理効果が得ら
れた。このように、pH依存性が少なくまた凝集沈澱処理
と加圧浮上処理の両者に高い効果を示すことが特徴であ
る。 In the pressure flotation treatment, 1/3 amount of pressurized water adjusted to a pressure of 4 kg / cm 2 was added to white water while blowing air with a compressor, and the clarified water after 5 minutes was used as a sample for absorbance measurement. An extremely high treatment effect of 85% or more was obtained in a slightly acidic state, and an extremely high treatment effect of 75% or more was obtained even at pH 11.0. As described above, it is characterized by a low pH dependence and a high effect on both the coagulation sedimentation treatment and the pressure flotation treatment.
実施例２ 白水１に、STMACとベントナイトの量を変えて、pH4.5
に調節して凝集沈澱処理もしくは加圧浮上分離処理を行
った。結果を表３に示す。Example 2 The amount of STMAC and bentonite was changed to white water 1 at pH 4.5.
To perform coagulation sedimentation treatment or pressure flotation treatment. Table 3 shows the results.
ベントナイトをSTMACの２倍以上使用すると、凝集沈
澱処理の効果がみられる。When bentonite is used twice or more of STMAC, the effect of the coagulation and sedimentation treatment is seen.
STMACが220ppm（ここで用いた白水のカチオン要求量
の25％に相当する）以下になると，減少率は低下する傾
向にある。すなわち、白水のカチオン要求量の25％以上
の４級アンモニウム塩を使用することが好ましい。When the STMAC falls below 220 ppm (corresponding to 25% of the cation requirement of the white water used here), the reduction rate tends to decrease. That is, it is preferable to use a quaternary ammonium salt of 25% or more of the cation requirement of the white water.
実施例３ 白水１に、オクチルトリメチルアンモニウムブロミド
（0 TMAB）800ppm（カチオン要求量とほぼ等量）とベン
トナイト4000ppm、あるいはジセチルジメチルアンモニ
ウムブロミド（DCDMAB）1500ppmとベントナイト4000ppm
を添加し、pH4.5に調節して凝集沈澱処理および加圧浮
上処理を行った。凝集沈澱処理ではそれぞれ59.9％,36.
1％で加圧浮上処理ではそれぞれ47.8％,84.7％の処理効
果が得られた。モノアルキルタイプの４級アンモニウム
塩の脂肪鎖は好ましくは炭素数８以上のものがよい。ジ
長鎖アルキルタイプの４級アンモニウム塩は、加圧浮上
処理で好結果を与える。 Example 3 In white water 1, octyltrimethylammonium bromide (0 TMAB) 800 ppm (almost equivalent to the cation requirement) and bentonite 4000 ppm, or dicetyldimethylammonium bromide (DCDMAB) 1500 ppm and bentonite 4000 ppm
Was added to the mixture, and the mixture was adjusted to pH 4.5 to carry out coagulation precipitation treatment and pressure flotation treatment. 59.9% and 36.
At 1%, 47.8% and 84.7% of the processing effect were obtained by the pressure flotation treatment, respectively. The fatty chain of the monoalkyl type quaternary ammonium salt preferably has 8 or more carbon atoms. Quaternary ammonium salts of the dilong chain alkyl type give good results in flotation under pressure.
実施例４ 白水１に、ステアリルピリジニウムブロミド1000ppm
（カチオン要求量とほぼ等量）とベントナイト4000ppm
を添加してpHを4.5に調節し、同様の実験を行った。凝
集沈澱処理は80.1％、加圧浮上処理は81.3％の効果が得
られた。Example 4 Stearyl pyridinium bromide 1000 ppm in white water 1
(Almost equivalent to cation demand) and bentonite 4000ppm
Was added to adjust the pH to 4.5, and a similar experiment was performed. The effect of coagulation and sedimentation was 80.1%, and the effect of pressure flotation was 81.3%.
実施例５ 白水１にSTMAC880ppmと酸性白土4000ppmを添加してpH
4.5に調節して同様の実験を行うと、凝集沈澱処理は88.
0％、加圧浮上処理は89.4％の効果が得られた。Example 5 pH of STMAC 880 ppm and acid clay 4,000 ppm were added to white water 1
Performing the same experiment with adjusting to 4.5, the coagulation sedimentation treatment was 88.
The effect of 0% and the effect of pressure flotation were 89.4%.
実施例６ 白水２に、300ppmのSTMAC（カチオン要求量とほぼ等
量）と1400ppmのベントナイトを加えてpH4.5に調節、あ
るいは白水３に800ppmのSTMAC（カチオン要求量とほぼ
等量）と3500ppmのベントナイトを加えてpH9.0に調節し
て同様の実験を行ったところ、凝集沈澱処理の効果はそ
れぞれ85.4％、89.7％、加圧浮上処理の効果はそれぞれ
84.8％、86.5％であった。Example 6 300 ppm of STMAC (almost equivalent to the cation requirement) and 1400 ppm of bentonite were added to white water 2 to adjust the pH to 4.5, or 800 ppm of STMAC (approximately equivalent to the cation requirement) and 3500 ppm to white water 3 The same experiment was conducted by adjusting the pH to 9.0 with the addition of bentonite. The effect of the coagulation and sedimentation treatment was 85.4% and 89.7%, respectively, and the effect of the pressure flotation treatment was
84.8% and 86.5%.
比較例１ 白水１に、ステアリルトリメチルアンモニウムクロラ
イド（STMAC）を880ppm加え、pH4.5に調節して凝集沈澱
処理もしくは加圧浮上選別処理を行った。その結果、そ
れぞれの減少率はともに３％であった。Comparative Example 1 Stearyl trimethylammonium chloride (STMAC) was added to White Water 1 at 880 ppm, adjusted to pH 4.5, and subjected to coagulation sedimentation treatment or pressure flotation separation treatment. As a result, each reduction rate was 3%.
白水１に、ベントナイト4000ppmを加えて同様の実験
を行ったところ、凝集沈澱処理、加圧浮上処理による減
少率はそれぞれ51％と−75％であった。When the same experiment was performed by adding 4000 ppm of bentonite to White Water 1, the reduction rates by the coagulation sedimentation treatment and the pressure flotation treatment were 51% and -75%, respectively.
処理効果が負の値を取るのは主に、凝集あるいは除去
されずに残った填料のために処理水の吸光度が出発原料
白水の吸光度より大きくなったためである。The reason why the treatment effect takes a negative value is mainly because the absorbance of the treated water becomes larger than the absorbance of the starting raw material white water due to the filler remaining without being aggregated or removed.
すなわち、陽イオン性界面活性剤あるいはベントナイ
ト単独では十分な効果は得られない。That is, the cationic surfactant or bentonite alone cannot provide a sufficient effect.
比較例２ 白水１に、アラム1000ppm（最適添加量）もしくはポ
リエチレンイミン120ppm（最適添加量）を添加してpHを
変えて凝集沈澱処理もしくは加圧浮上処理した。結果を
表４に示す。Comparative Example 2 Alum 1000 ppm (optimal amount) or polyethyleneimine 120 ppm (optimal amount) was added to white water 1 and the pH was changed to perform coagulation sedimentation treatment or pressure flotation treatment. Table 4 shows the results.
表４をみると、アラムではpH5.0以下あるいはポリエ
チレンイミンではpH8.0以下の範囲でしか効果が得られ
ないことが判る。Table 4 shows that the effect can be obtained only in the range of pH 5.0 or less for alum or pH 8.0 or less for polyethyleneimine.
比較例３ 白水１にSTMAC880ppmとカオリン4000ppmあるいはSTMA
C880ppmとタルク4000ppm添加してpH4.5に調節した後、
同様の実験を行った。その結果、凝集沈澱処理ではそれ
ぞれ−24.1％、41.4％で、加圧浮上処理ではそれぞれ−
30.8％、−130％であった。 Comparative Example 3 STMAC 880 ppm and kaolin 4000 ppm or STMA in white water 1
After adjusting the pH to 4.5 by adding C880ppm and talc 4000ppm,
A similar experiment was performed. As a result, they were -24.1% and 41.4% respectively in the coagulation and sedimentation treatment, and-
30.8% and -130%.
カオリン、タルクはベントナイトともに製紙工程での
汚染物質の吸着剤として汎用されているものである。Both kaolin and talc are commonly used as adsorbents for pollutants in the papermaking process together with bentonite.
本発明においては、以上に説明したように、４級アン
モニウム基を有する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白水に添加し、凝集沈
澱処理および／または浮上選別処理を行うことによって
著しく、白水の清澄効果を向上することができた。同時
に従来、凝集沈澱処理もしくは浮上選択処理において凝
集剤を区別して使用する必要があったが、本発明により
その両者に適し、広範な条件、特に高pH域でも適用可能
になった。In the present invention, as described above, a cationic surfactant having a quaternary ammonium group and a clay mineral mainly composed of montmorillonite are added to white water, and coagulation sedimentation treatment and / or flotation separation treatment are performed. This significantly improved the clarification effect of the white water. At the same time, in the past, it was necessary to use a flocculant separately in the flocculation sedimentation treatment or the flotation selection treatment. However, the present invention has made it suitable for both, and has become applicable to a wide range of conditions, especially in a high pH range.
Claims (4)
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
粘土鉱物とを添加し、汚濁物質を分離除去することを特
徴とする、製紙白水の処理方法。1. A papermaking white water treatment comprising adding a cationic surfactant having a quaternary ammonium group to a papermaking whitewater and a clay mineral mainly composed of montmorillonite to separate and remove pollutants. Method.
の脂肪鎖を少なくとも１つ以上有する４級アンモニウム
系界面活性剤である、請求項第１項記載の方法。2. The method according to claim 1, wherein the cationic surfactant has 8 to 20 carbon atoms.
The method according to claim 1, which is a quaternary ammonium surfactant having at least one or more fatty chains.
た後に凝集沈澱処理および／または浮上選別処理を行
う、請求項第１項記載の方法。3. The method according to claim 1, wherein a coagulation sedimentation treatment and / or a flotation separation treatment are carried out after the addition of the cationic surfactant and the clay mineral.
る陽イオン性界面活性剤を使用して行う、請求項第１項
記載の方法。4. The process according to claim 1, wherein the process is carried out using a cationic surfactant corresponding to at least 25% of the cation requirement of the white water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25708989A JP2834492B2 (en) | 1989-10-03 | 1989-10-03 | Papermaking white water treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25708989A JP2834492B2 (en) | 1989-10-03 | 1989-10-03 | Papermaking white water treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03119189A JPH03119189A (en) | 1991-05-21 |
| JP2834492B2 true JP2834492B2 (en) | 1998-12-09 |
Family
ID=17301591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25708989A Expired - Fee Related JP2834492B2 (en) | 1989-10-03 | 1989-10-03 | Papermaking white water treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2834492B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005075363A1 (en) * | 2004-02-10 | 2005-08-18 | Chugai Photo Chemial Co., Ltd. | Borofluoric acid-trapping agent and method of treating wastewater with the same |
| JP5054334B2 (en) * | 2006-07-07 | 2012-10-24 | 株式会社アステック | Flocculant and water treatment method |
| JP4676996B2 (en) * | 2008-02-19 | 2011-04-27 | 中村物産有限会社 | Water treatment apparatus and water treatment method |
| CN104355485B (en) * | 2014-10-24 | 2016-04-27 | 苏州富奇诺水治理设备有限公司 | A kind for the treatment of system of paper waste and method |
| SE540853C2 (en) * | 2016-10-28 | 2018-12-04 | Stora Enso Oyj | A method to form a web comprising cellulose fibers |
| JP6569758B1 (en) * | 2018-03-14 | 2019-09-04 | 栗田工業株式会社 | Pitch failure prevention method |
| JP7293903B2 (en) * | 2019-06-21 | 2023-06-20 | 栗田工業株式会社 | Papermaking inhibitor recovery method |
-
1989
- 1989-10-03 JP JP25708989A patent/JP2834492B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03119189A (en) | 1991-05-21 |
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