JPS61254288A - Method for solid-liquid separation of liquid containing fine particles or colloid - Google Patents
Method for solid-liquid separation of liquid containing fine particles or colloidInfo
- Publication number
- JPS61254288A JPS61254288A JP9750485A JP9750485A JPS61254288A JP S61254288 A JPS61254288 A JP S61254288A JP 9750485 A JP9750485 A JP 9750485A JP 9750485 A JP9750485 A JP 9750485A JP S61254288 A JPS61254288 A JP S61254288A
- Authority
- JP
- Japan
- Prior art keywords
- water
- membrane
- treated
- separation
- fine particles
- 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.)
- Pending
Links
- 238000000926 separation method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000000084 colloidal system Substances 0.000 title claims description 10
- 239000010419 fine particle Substances 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 2
- 239000011343 solid material Substances 0.000 claims 1
- 238000007710 freezing Methods 0.000 abstract description 11
- 230000008014 freezing Effects 0.000 abstract description 11
- 239000002351 wastewater Substances 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000011001 backwashing Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 238000010257 thawing Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001612 separation test Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical compound ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は懸濁液の処理方法に関するものであり、さらに
詳しくは、研磨廃水等の沈降分離困難な微粒子やコロイ
ド等を含む廃水の固液分離方法に係るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for treating suspensions, and more specifically, solid-liquid wastewater containing fine particles and colloids that are difficult to separate by sedimentation, such as polishing wastewater. This relates to the separation method.
［従来の技術１
従来、研磨廃水のような微粒子やコロイドを含む廃水に
ついては、そのままでは沈降分離できないので、ポリ塩
化アルミニウム、硫酸ばん土、塩化第二鉄等の無機凝集
剤、あるいはそれらに高分子凝集剤を組合せて添加し、
凝集！ｌｔｌ処理するか、精密ろ過、限外ろ過等の膜分
離法により処理されている。[Conventional technology 1 Conventionally, wastewater containing fine particles and colloids such as polishing wastewater cannot be separated by sedimentation as it is, so inorganic flocculants such as polyaluminum chloride, sulfuric acid chloride, ferric chloride, etc., or those with high concentrations are used. Adding a combination of molecular flocculants,
Cohesion! ltl treatment or membrane separation methods such as microfiltration and ultrafiltration.
しかしながら凝集沈澱法で処理する場合には大量の凝集
剤を添加しなければ所期の効果が得られず、またきわめ
て脱水しにくいスラッジが大量に発生しその処分方法が
別途必要となる。さらに懸濁物が有価なものであっても
大量の凝集剤と一緒に沈澱してしまうので、回収がより
困難となる。However, when processing by the coagulation-sedimentation method, the desired effect cannot be obtained unless a large amount of coagulant is added, and a large amount of sludge, which is extremely difficult to dewater, is generated, which requires a separate method for disposal. Furthermore, even if the suspension is valuable, it will precipitate together with a large amount of flocculant, making recovery more difficult.
さらに凝集沈澱処理だけでは処理水中に少量の懸濁物の
残存をまぬがれることができず、処理水をそのまま再利
用しようとしても用途がかなり限定される。Furthermore, coagulation-sedimentation treatment alone cannot avoid a small amount of suspended matter remaining in the treated water, and even if it is attempted to reuse the treated water as it is, its uses are quite limited.
一方、膜分離法は無薬注であるので懸濁物や水の回収は
原理的には充分可能であると考えられるが、実際には膜
面の汚染ないし膜の閉富等の障害により、頻繁に逆洗処
理を行なっても処理水量の低下はまぬがれない。従って
膜分離法により研磨廃水等の処理を長期にわたって安定
的に行なうには、何らかの前処哩により上記障害を防止
しなければならない。On the other hand, since the membrane separation method does not require chemical injection, it is thought that it is possible to recover suspended solids and water in principle, but in reality, due to obstacles such as contamination of the membrane surface or membrane occlusion, Even if backwashing is performed frequently, the amount of treated water will inevitably decrease. Therefore, in order to treat polishing wastewater and the like stably over a long period of time by membrane separation, it is necessary to prevent the above-mentioned problems by some kind of pretreatment.
［発明が解決しようとしている同題点］本発明の目的は
、懸濁物や水の回収が可能な膜分離法で研磨廃水等の沈
澱分離困難な微粒子やコロイドを含む廃水を長期にわた
って安定的に処理できるようにするために、薬注等を一
切行なわずに廃水中の懸濁物を粗大化し膜面の汚染や躾
の閉塞を防止することにある。[Same problem to be solved by the invention] The purpose of the present invention is to stabilize wastewater containing fine particles and colloids that are difficult to separate by precipitation, such as polishing wastewater, over a long period of time using a membrane separation method that can recover suspended solids and water. In order to be able to treat the wastewater in a timely manner, the purpose is to coarsen the suspended matter in the wastewater without any chemical injection, thereby preventing contamination of the membrane surface and clogging of the drain.
ｃ問題を解決するための手段］
本発明は上記目的を達成するため、被処理水を冷却、凍
結したのち融解し、要すれば融解後沈降分離を行ない、
しかる後に膜分離を行なうことを特徴とする。なお、冷
却、凍結においては氷晶が徐々に成長し得る速度で行な
うことを要件とする。Means for Solving Problem c] In order to achieve the above object, the present invention cools and freezes the water to be treated, then thaws it, and if necessary, performs sedimentation separation after thawing,
The method is characterized in that membrane separation is performed after that. Note that cooling and freezing must be performed at a rate that allows ice crystals to grow gradually.
［作用］
被処理水を徐々に凍結することにより懸濁物が凝集結合
して粗大化する。これを融解した後膜分ＩＩＩするが、
この際被処理水中の懸濁物は凍結、融解処理工程におい
てあらかじめ粗大化されているので膜面汚染ないし膜の
閉塞を起さなくなっており、長期にわたって安定的な膜
処理が可能となる。[Operation] Gradually freezing the water to be treated causes suspended matter to coagulate and become coarse. After melting this, membrane fraction III is obtained.
At this time, the suspended matter in the water to be treated is coarsened in advance during the freezing and thawing treatment steps, so that it does not cause membrane surface contamination or membrane clogging, and stable membrane treatment can be performed over a long period of time.
また膜分離により濃縮水側に含まれてでてくる懸濁物は
上記のように粗大化されているので容易に沈降分離でき
、しかも粗大化の過程で水を排除したかたちで懸濁物が
凝集、結合しているので沈降分離後の脱水も極めて容易
である。In addition, the suspended matter contained in the concentrated water after membrane separation is coarsened as described above, so it can be easily separated by sedimentation. Because they are coagulated and bonded, dehydration after sedimentation and separation is extremely easy.
なお、被処理水中の懸濁物濃度が高い場合には、凍結、
融解後いったん沈降分離を行ない膜分離の負荷を下げる
こともできる。また、濃縮水を沈降分離した上澄水中に
懸濁物が残存している場合には、再度凍結工程へ戻すこ
とにより、懸濁物を系外へ一切出さない完全クローズド
化も可能である。In addition, if the concentration of suspended solids in the water to be treated is high, freezing,
It is also possible to perform sedimentation separation once after melting to reduce the load on membrane separation. In addition, if suspended matter remains in the supernatant water obtained by sedimentation and separation of the concentrated water, by returning it to the freezing process, it is possible to achieve a completely closed system in which no suspended matter is discharged from the system.
［実施例コ
濁１９２６０度、懸濁物の平均粒径が約１μｍの研磨廃
水的３００）を第１図に示すフロー・ダイヤグラムによ
り処理した。凍結工程においては、被処理水を室温から
凝固点（０℃）まで冷却したのち、氷晶が徐々に成長す
るように、その温度において１０分間かけて全体を凍結
させた。凍結終了後直ちに融解し膜処理を行なったが、
この時に使用した膜はポリビニルアルコール製の精密ろ
過膜で、操作圧力１Ｋｇ／ｃａｔ、Ｉｌ１面流速１．Ｏ
ｍ／秒、濃縮倍率５倍という条件で行なった。なお処理
水量の低下を抑制するために、１時間おきに１回２分間
の空気逆洗を行なった。この時の処理水の濁度は０．１
度以下であった。[Example 300, a polishing wastewater with a turbidity of 19260 degrees and an average particle size of the suspension of about 1 μm] was treated according to the flow diagram shown in FIG. In the freezing step, the water to be treated was cooled from room temperature to the freezing point (0° C.), and then the entire water was frozen at that temperature for 10 minutes so that ice crystals gradually grew. Immediately after freezing, it was thawed and subjected to membrane treatment, but
The membrane used at this time was a precision filtration membrane made of polyvinyl alcohol, with an operating pressure of 1 Kg/cat and a surface flow rate of 1. O
The experiment was carried out under the conditions of m/sec and a concentration factor of 5 times. In order to suppress a decrease in the amount of treated water, air backwashing was performed for 2 minutes once every hour. The turbidity of the treated water at this time is 0.1
It was below 30 degrees.
また処理水量の経時変化を第２図に示すが、当 ４初の
処理水量は８３ｆ／ｙＩｔ−ｈｒと大きく、水量の低下
も１時間後で５ｆ？／ｆｆ１−ｈｒ相当分と１１＼ざい
。またこの低下分も空気逆洗によって容易に復旧し、１
０サイクル目でも逆洗直後の処理水ｆｆ１Ｉま当初と全
く変らない。Figure 2 shows the change in the amount of treated water over time.The amount of treated water at the beginning of the 4th century was as large as 83f/yIt-hr, and the water amount decreased by 5f/yIt-hr after one hour. /ff1-hr equivalent and 11\. In addition, this decrease can be easily restored by air backwashing, and 1
Even in the 0th cycle, the treated water ff1I immediately after backwashing is completely unchanged from the beginning.
比較のために凍結、融解処理を行なわな（＼場合につい
ても、上記と同一条件で膜分離試験を行なった。この場
合も処理水濁度は０．１度以下になったが、処理水量は
第２図に示したように当初の処理水量自体が６５ゴ・ｈ
ｒと少なく、しかも５サイクル目の逆洗直後でも３０ｆ
／ｍ・ｈｒと急速に低下した。For comparison, a membrane separation test was conducted under the same conditions as above without freezing and thawing treatment.Also in this case, the turbidity of the treated water was below 0.1 degrees, but the amount of treated water was As shown in Figure 2, the initial amount of treated water itself was 65 go・h.
30f even immediately after the 5th cycle of backwashing
/m・hr.
［発明の効果コ
本発明により、被処理水を冷却、凍結した後融解するこ
とによって、従来沈澱分離困難とされていた微細な粒子
やコロイドを粗大化し、薬注を行なうことなく、沈降分
離、膜分離によって微粒子やコロイドが充分に分離され
、且つ長期にわたって安定的に処理を行なうことができ
る。[Effects of the invention] According to the present invention, by cooling, freezing and then thawing the water to be treated, fine particles and colloids, which were conventionally considered difficult to be separated by precipitation, can be coarsened, and sedimentation and separation can be performed without chemical injection. Fine particles and colloids are sufficiently separated by membrane separation, and the treatment can be carried out stably over a long period of time.
第１図は実施例におけるフロー・ダイヤグラムを示す。
第２図は実施例における処理水量の経時変化を表わした
ものである。FIG. 1 shows a flow diagram in an embodiment. FIG. 2 shows the change over time in the amount of treated water in the example.
Claims (1)
成長しうる速度で冷却、凍結したのち融解して、被処理
水中の微粒子やコロイド等を粗大化せしめ、さらに膜分
離処理することを特徴とする微粒子やコロイド等を含む
液の固液分離方法。 ２ 前記方法において融解して被処理水中の微粒子やコ
ロイド等を粗大化させたものを、沈降分離し、上澄液を
膜分離処理することを特徴とする特許請求の範囲第１項
記載の固液分離方法。[Claims] 1. Water to be treated containing fine particles, colloids, etc. is cooled at a speed that allows ice crystals to grow gradually, then thawed to coarsen fine particles, colloids, etc. in the water to be treated, and further A solid-liquid separation method for liquids containing fine particles, colloids, etc., characterized by membrane separation treatment. 2. The solid material according to claim 1, characterized in that in the above method, fine particles, colloids, etc. in the water to be treated are melted and coarsened and separated by sedimentation, and the supernatant liquid is subjected to membrane separation treatment. Liquid separation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9750485A JPS61254288A (en) | 1985-05-07 | 1985-05-07 | Method for solid-liquid separation of liquid containing fine particles or colloid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9750485A JPS61254288A (en) | 1985-05-07 | 1985-05-07 | Method for solid-liquid separation of liquid containing fine particles or colloid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61254288A true JPS61254288A (en) | 1986-11-12 |
Family
ID=14194090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9750485A Pending JPS61254288A (en) | 1985-05-07 | 1985-05-07 | Method for solid-liquid separation of liquid containing fine particles or colloid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61254288A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02265628A (en) * | 1989-04-05 | 1990-10-30 | Kurita Water Ind Ltd | Membranous separating process |
| WO2012121703A1 (en) * | 2011-03-07 | 2012-09-13 | Empire Technology Development Llc | Systems, materials, and processes for isolating nanoparticles |
| RU2543893C2 (en) * | 2012-10-16 | 2015-03-10 | Государственное Научное Учреждение Научно-исследовательский институт ветеринарии Восточной Сибири Россельхозакадемии | Accelerated method of purifying water zeolite solutions from suspended particles |
-
1985
- 1985-05-07 JP JP9750485A patent/JPS61254288A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02265628A (en) * | 1989-04-05 | 1990-10-30 | Kurita Water Ind Ltd | Membranous separating process |
| WO2012121703A1 (en) * | 2011-03-07 | 2012-09-13 | Empire Technology Development Llc | Systems, materials, and processes for isolating nanoparticles |
| US8413462B2 (en) | 2011-03-07 | 2013-04-09 | Empire Technology Development Llc | Systems, materials, and processes for isolating nanoparticles |
| CN103328389A (en) * | 2011-03-07 | 2013-09-25 | 英派尔科技开发有限公司 | Systems, materials, and processes for isolating nanoparticles |
| CN103328389B (en) * | 2011-03-07 | 2014-08-20 | 英派尔科技开发有限公司 | Systems, materials, and processes for isolating nanoparticles |
| RU2543893C2 (en) * | 2012-10-16 | 2015-03-10 | Государственное Научное Учреждение Научно-исследовательский институт ветеринарии Восточной Сибири Россельхозакадемии | Accelerated method of purifying water zeolite solutions from suspended particles |
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