JPS61500A - Dehydration filter assistant of sludge containing metal hydroxide - Google Patents
Dehydration filter assistant of sludge containing metal hydroxideInfo
- Publication number
- JPS61500A JPS61500A JP59120034A JP12003484A JPS61500A JP S61500 A JPS61500 A JP S61500A JP 59120034 A JP59120034 A JP 59120034A JP 12003484 A JP12003484 A JP 12003484A JP S61500 A JPS61500 A JP S61500A
- Authority
- JP
- Japan
- Prior art keywords
- metal hydroxide
- complex compound
- polyvinyl alcohol
- water
- metal
- 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
Landscapes
- Filtering Materials (AREA)
- Treatment Of Sludge (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【発明の詳細な説明】 重金属を含有する産業廃水の処理原理は、酸化。[Detailed description of the invention] The principle of treatment of industrial wastewater containing heavy metals is oxidation.
還元、中和、等の処理により、金属水酸化物として水に
不溶化させ、水と分離させる方法が主流である。分離さ
れた金属水酸化物は、フィルタープレス、真空脱水機、
遠心分離機等により、脱水し含水率の少ないケーク状態
とし、ケークの体積を少なくすることにより産業廃棄物
処理費用の節約と取り扱い易い状態にすることを目的と
している。The mainstream method is to make the metal insoluble in water as a metal hydroxide through treatments such as reduction and neutralization, and to separate it from the water. Separated metal hydroxides can be processed using filter presses, vacuum dehydrators,
The purpose is to reduce the cost of industrial waste treatment and to make it easier to handle by dehydrating it using a centrifuge or the like to form a cake with a low water content and reducing the volume of the cake.
しかし、一般に、中和剤にアルカリでは、苛性ソーダ、
石灰、酸では、硫酸が使用されている。However, in general, when using an alkali as a neutralizing agent, caustic soda,
Among lime and acids, sulfuric acid is used.
特に、苛性ソーダや硫酸で中和して金属水酸化物を生成
させた場合、分離された汚泥は、コロイド状態になって
いて、凡用脱水機のフィルタープレス、真空脱水機では
、炉布の目詰りを起し易く脱水能力が低下し１、そのた
め、脱水機の選定には、規模の大きいものが必要となる
し、又、脱水効果も悪く脱水ケークの含水率も高く８０
〜８５％と高く、従って、産業廃棄物であるケーク量も
多くなり、水分の多い取り扱いにくい状態となっている
。In particular, when metal hydroxides are generated by neutralization with caustic soda or sulfuric acid, the separated sludge is in a colloidal state, and cannot be used in the filter press of general-purpose dehydrators or vacuum dehydrators. It is easy to get clogged and the dehydration capacity is reduced.1 Therefore, when selecting a dehydrator, a large-scale one is required, and the dehydration effect is poor and the water content of the dehydrated cake is high.
As a result, the amount of cake, which is industrial waste, is high, and it is difficult to handle due to its high water content.
この発明は、重金属水酸化物汚泥に、ポリビニールアル
コールを加え、更に、硼砂、硼酸、硫酸ナトリウム、硫
酸カリウム、硫酸アンモニウム等のいづれか、あるいは
、混合して添加するにとにより、金属水酸化物汚泥の脱
水効果と濾過性の優れた粒子とすることを目的としでい
る。This invention produces metal hydroxide sludge by adding polyvinyl alcohol to heavy metal hydroxide sludge, and further adding one or a mixture of borax, boric acid, sodium sulfate, potassium sulfate, ammonium sulfate, etc. The purpose is to create particles with excellent dehydration effect and filterability.
金属水酸化物汚泥に、ポリビニールアルコールを、重金
属水酸化物乾燥固型分に対し、ポリビニールアルコール
乾燥固型分として、３〜ｌｏ％加え、良く攪拌するとポ
リビニールアルコールド金属水酸化物が錯反応を起し金
属錯化合物が生成される。更に、この金属錯化合物汚泥
に、硼砂、硼酸、硫酸ナトリウム、硫酸カリウム、硫酸
アンモニウム、等あるいは、混合物を金属水酸化物乾燥
固型物量に対し、３〜１５９６１％加するにとにより、
金属錯化合物と、未反応のポリビニールアルコールが水
に不溶化すると同時に、含水汚泥の形状が、スポンジ状
態の粗大粒子となる。このスポンジ状態の生成物汚泥を
、Ｆ右型脱水機の代表であるフィルタープレスにて脱水
すると、脱水ケーク中の含水ａ−〃・、６０〜７５％と
なり、ケーク容積が従来法に比較して、１／２〜１／３
になる。又、連続して脱水機を稼動した場合も、この処
理ケークは、１ ベトつきもなく、脱水時間も極
めて短時間で済む。Polyvinyl alcohol is added to the metal hydroxide sludge in an amount of 3 to 10% as a polyvinyl alcohol dry solid content based on the heavy metal hydroxide dry solid content, and when stirred well, polyvinyl alcohol metal hydroxide is formed. A complex reaction occurs and a metal complex compound is produced. Furthermore, by adding borax, boric acid, sodium sulfate, potassium sulfate, ammonium sulfate, etc. or a mixture to this metal complex compound sludge in an amount of 3 to 15961% based on the amount of dry solid metal hydroxide,
At the same time that the metal complex compound and unreacted polyvinyl alcohol become insoluble in water, the shape of the water-containing sludge becomes coarse particles in the form of a sponge. When this sponge-like product sludge is dehydrated using a filter press, which is typical of the F-right type dehydrator, the water content in the dehydrated cake becomes 60 to 75%, and the cake volume is lower than that of the conventional method. , 1/2~1/3
become. Furthermore, even when the dehydrator is operated continuously, the treated cake is not sticky and the dehydration time is extremely short.
又、脱水後、ケークと炉布との剥離性も良いので、炉布
洗浄の回数も少なくて済む。更に、脱水後のＰａ水０Ｂ
ＯＤ 、ＣＯＤは、１０ ｍａｐ／ｚ 以下を保持でき
る。Furthermore, since the peelability between the cake and oven cloth after dehydration is good, the number of times the oven cloth must be washed can be reduced. Furthermore, Pa water 0B after dehydration
OD and COD can be maintained at 10 map/z or less.
４、 実施列
鉄鋼酸洗工場廃水を苛性ソーダで中和し、凝集沈澱させ
生成した水酸化鉄汚泥をそのままフィルタープレスにて
脱水処理した結果と、この発明による方法で処理して脱
水処理した結果の比較をすると、
（脱水処理条件）
水酸化鉄濃度 １．９％フィルタープレ
ス処理圧力 ｓ、ｓＫ９／ｃｎｌ添加薬品 ポリビニ
ール 金属乾燥固型アルコール 分に対し５チ添
加
硼 砂 金属乾燥固型
分に対し５％添
加4. The results of dehydrating the iron hydroxide sludge produced by neutralizing the wastewater of the steel pickling factory with caustic soda and coagulating and precipitating it using a filter press, and the results of dehydrating it by the method according to the present invention. For comparison, (Dehydration treatment conditions) Iron hydroxide concentration: 1.9% Filter press treatment pressure: s, sK9/cnl Added chemicals: Polyvinyl, 5% boron per metal dry solid alcohol content, Sand: Metal dry solid content 5% addition
Claims (1)
合し、ポリビニールアルコールと金属水酸化物との錯反
応による錯化合物を生成させた後、硼砂、硼酸、硫酸ナ
トリウム、硫酸カリウム、硫酸アンモニウム等のいづれ
か、あるいは混合して添加するにとにより、ポリビニー
ルアルコール、及び、その錯化合物を水に不溶化させ、
重金属水酸化物を濾過性の優れた粒子とさせる方法。1. After mixing polyvinyl alcohol and metal hydroxide sludge to generate a complex compound through a complex reaction between polyvinyl alcohol and metal hydroxide, borax, boric acid, sodium sulfate, potassium sulfate, ammonium sulfate, etc. Polyvinyl alcohol and its complex compounds are made insoluble in water by adding either one or by mixing,
A method for converting heavy metal hydroxides into particles with excellent filterability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120034A JPS61500A (en) | 1984-06-13 | 1984-06-13 | Dehydration filter assistant of sludge containing metal hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120034A JPS61500A (en) | 1984-06-13 | 1984-06-13 | Dehydration filter assistant of sludge containing metal hydroxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61500A true JPS61500A (en) | 1986-01-06 |
Family
ID=14776264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59120034A Pending JPS61500A (en) | 1984-06-13 | 1984-06-13 | Dehydration filter assistant of sludge containing metal hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61500A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436295U (en) * | 1987-08-31 | 1989-03-06 | ||
| CN110577350A (en) * | 2019-10-17 | 2019-12-17 | 四川公路桥梁建设集团有限公司 | Harmless treatment method for engineering waste slurry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831761A (en) * | 1971-08-27 | 1973-04-26 | ||
| JPS4981270A (en) * | 1972-12-13 | 1974-08-06 |
-
1984
- 1984-06-13 JP JP59120034A patent/JPS61500A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831761A (en) * | 1971-08-27 | 1973-04-26 | ||
| JPS4981270A (en) * | 1972-12-13 | 1974-08-06 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436295U (en) * | 1987-08-31 | 1989-03-06 | ||
| CN110577350A (en) * | 2019-10-17 | 2019-12-17 | 四川公路桥梁建设集团有限公司 | Harmless treatment method for engineering waste slurry |
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