JP3305012B2 - Method for regenerating ferric chloride solution from wastewater sludge - Google Patents
Method for regenerating ferric chloride solution from wastewater sludgeInfo
- Publication number
- JP3305012B2 JP3305012B2 JP28882092A JP28882092A JP3305012B2 JP 3305012 B2 JP3305012 B2 JP 3305012B2 JP 28882092 A JP28882092 A JP 28882092A JP 28882092 A JP28882092 A JP 28882092A JP 3305012 B2 JP3305012 B2 JP 3305012B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- ferric chloride
- chloride solution
- wastewater sludge
- wastewater
- 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
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は鉄分を含む廃水スラッ
ジ、特に逆浸透膜法による海水淡水化の前処理装置であ
る二層ろ過装置から排出される廃水スラッジ、を処理し
て凝集剤として有用な塩化第二鉄溶液を再生する方法に
関する。The present invention is useful as a flocculant by treating wastewater sludge containing iron, particularly wastewater sludge discharged from a two-layer filtration device which is a pretreatment device for seawater desalination by a reverse osmosis membrane method. And a method for regenerating a ferric chloride solution.
【０００２】[0002]
【従来の技術】従来、逆浸透膜法による海水淡水化の前
処理装置である砂−アンスラサイト（無煙炭）からなる
二層ろ過装置から排出される鉄分を含む廃水スラッジは
廃棄物としてろ過、圧搾などの処理をした後に処分する
か、処理することなくそのまま海水へ排出していた。2. Description of the Related Art Conventionally, wastewater sludge containing iron content discharged from a two-layer filter made of sand-anthracite (anthracite), which is a pretreatment device for seawater desalination by a reverse osmosis membrane method, is filtered and pressed as waste. After the treatment, they were disposed of or discharged directly into seawater without treatment.
【０００３】[0003]
【発明が解決しようとする課題】逆浸透膜法による海水
淡水化装置では、膜性能維持のため二層ろ過装置での前
処理装置により海水中の汚濁物質（コロイド性の有機物
及び無機物やウィルス、細菌など）を除去する必要があ
り、そのために凝集剤として塩化第二鉄溶液を添加して
上記汚濁物質を凝集してろ過除去している。二層ろ過装
置に堆積した汚濁物質は逆洗の際、廃水スラッジとして
排出される。その主成分は凝集目的で添加される塩化第
二鉄より生成する水酸化第二鉄〔Ｆｅ（ＯＨ）3 〕であ
るが、他にも酸化けい素（ＳｉＯ2 ）、酸化アルミニウ
ム（Ａｌ2 Ｏ3 ）、炭酸カルシウム（ＣａＣＯ3 ）など
が混在し、かつかなりの有機物及び微生物によるスライ
ムが付着している。この廃水スラッジをろ過、圧搾など
の処理により固形物として廃棄処分する方法もあるが、
大型プラントになるにつれ、そのスラッジ量は大容量と
なり、処理コスト上適用は難しい。また廃水スラッジを
処理することなく、そのまま海水へ排出したのでは環境
問題を引き起こす可能性が大きいため、その適正処理対
策が課題とされている。In a seawater desalination apparatus using a reverse osmosis membrane method, pollutants (colloidal organic and inorganic substances, virus, colloidal organic matter, virus, For this purpose, a ferric chloride solution is added as a coagulant to coagulate the contaminants and remove them by filtration. Pollutants accumulated in the two-layer filtration device are discharged as wastewater sludge during backwashing. Its main component is ferric hydroxide [Fe (OH) 3 ] generated from ferric chloride added for the purpose of agglomeration. In addition, silicon oxide (SiO 2 ) and aluminum oxide (Al 2 O) 3 ), calcium carbonate (CaCO 3 ), etc. are mixed, and considerable organic substances and microbial slime adhere. There is also a method of disposing of this wastewater sludge as a solid by filtration, pressing, etc.,
As the plant becomes large, the amount of sludge becomes large, and it is difficult to apply it due to the processing cost. In addition, if wastewater sludge is directly discharged into seawater without being treated, there is a high possibility of causing environmental problems.
【０００４】本発明は上記技術水準に鑑み、鉄分を含む
廃水スラッジを処理し凝集剤として有用な塩化第二鉄溶
液を再生する方法を提供しようとするものである。[0004] In view of the state of the art, the present invention aims to provide a method for treating wastewater sludge containing iron to regenerate a ferric chloride solution useful as a flocculant.
【０００５】[0005]
【課題を解決するための手段】本発明は鉄分を含む濃厚
廃水スラッジに次亜塩素酸ナトリウム溶液を添加してス
ラッジ中の微生物、スライム、有機物を酸化除去した
後、塩酸溶液を添加してスラッジ中の鉄分を溶解して塩
化第二鉄溶液とする第一工程と、第一工程で得られた塩
化第二鉄溶液をろ過機に通して酸不溶分とろ別する第二
工程よりなることを特徴とするろ過装置の廃水スラッジ
から塩化第二鉄溶液を再生する方法である。SUMMARY OF THE INVENTION According to the present invention, a concentrated wastewater sludge containing iron is added with a sodium hypochlorite solution to oxidize and remove microorganisms, slime, and organic substances in the sludge, and then a hydrochloric acid solution is added to the sludge. A first step of dissolving the iron content therein to obtain a ferric chloride solution, and a second step of filtering the ferric chloride solution obtained in the first step through a filter to remove acid-insoluble components. This is a method for regenerating a ferric chloride solution from wastewater sludge of a filtration device.
【０００６】[0006]
【作用】鉄分を含む濃厚廃水スラッジに次亜塩素酸ナト
リウム溶液を添加する目的はスラッジ中の微生物、微生
物によるスライム及び有機物を酸化除去するためで、も
し次亜塩素酸ナトリウム溶液の添加なしでは後記の第二
工程でのろ過機による酸不溶解分ろ別時に、とくにスラ
イムが膜面に付着目詰りしてろ過を阻害する。次亜塩素
酸ナトリウム溶液の添加量はスラッジ中の全有機物濃度
や廃水スラッジの含水量に応じて決定されるが、９５〜
９０％含水率スラッジ１ｍ3 に対して１２％次亜塩素酸
ナトリウム溶液３〜８リットル（塩素臭が若干する程
度）の範囲で添加すれば十分である。[Function] The purpose of adding sodium hypochlorite solution to concentrated wastewater sludge containing iron is to oxidize and remove microorganisms, slime and organic substances in the sludge, and the following will be described without the addition of sodium hypochlorite solution. In the second step, when the acid-insoluble fraction is filtered off by the filter, the slime adheres to and clogs the membrane surface, thereby inhibiting the filtration. The amount of the sodium hypochlorite solution to be added is determined according to the total organic matter concentration in the sludge and the water content of the wastewater sludge.
It is added at a range of relative 90% moisture content sludge 1 m 3 12% sodium hypochlorite solution 3-8 liters (degree to which chlorine smell slightly) is sufficient.
【０００７】酸化時の温度及び時間は常温及び２時間程
度でよいが、酸化を効率よくするために空気を吹き込ん
で十分に攪拌するのが好ましい。The temperature and time during the oxidation may be room temperature and about 2 hours, but it is preferable to blow air in and sufficiently stir the mixture in order to make the oxidation efficient.
【０００８】次にスラッジ中の鉄分〔Ｆｅ（ＯＨ）3 〕
を溶解させるために添加する塩酸濃度はスラッジ中の全
鉄濃度や含水量に応じて決定されるが、９５〜９０％含
水率スラッジでは４〜１０Ｗ（ＨＣｌ重量）／Ｖ（廃水
スラッジ容量）％の範囲であれば十分である。溶解時の
温度及び時間は特に制約はなく、常温及び２時間程度で
よいが、鉄分を効率よく溶解させ、また過剰の次亜塩素
酸塩を完全に分解させるためにも空気を吹き込むなどし
て十分に攪拌するのが好ましい。Next, iron in the sludge [Fe (OH) 3 ]
The concentration of hydrochloric acid added to dissolve the water is determined according to the total iron concentration and the water content in the sludge. For 95-90% water content sludge, 4-10W (HCl weight) / V (wastewater sludge capacity)% It is enough if it is in the range. The temperature and time during dissolution are not particularly limited, and may be room temperature and about 2 hours. However, air is blown to efficiently dissolve iron and completely decompose excess hypochlorite. It is preferable to mix well.
【０００９】また第二工程でのろ過機は第一工程で得ら
れた塩化第二鉄溶液に混在する酸不溶解分（ＳｉＯ2 、
Ａｌ2 Ｏ3 など）を完全にろ別するためのもので、その
ろ過機はプレスフィルタ方式または遠心分離方式その他
ろ別可能なものであればよく特に選定する必要はない。In the second step, the filter is used to remove acid-insoluble components (SiO 2 , SiO 2) mixed in the ferric chloride solution obtained in the first step.
Al 2 O 3 ) is completely filtered off, and the filter is not particularly required to be selected as long as it can be filtered by a press filter system or a centrifugal separation system.
【００１０】[0010]
【実施例】逆浸透膜法による海水淡水化の前処理装置で
ある二層ろ過装置から排出される廃水スラッジには、主
成分として鉄分〔組成Ｆｅ（ＯＨ）3 〕が、また、その
他海域によって若干異なるがシリカ（ＳｉＯ2 ）、アル
ミナ（Ａｌ2 Ｏ3 ）及び炭酸カルシウム（ＣａＣＯ3 ）
が、さらに、またコロイド状有機物、微生物、スライム
などの夾雑物が含まれている。ここではＦｅ（ＯＨ）3
５９．３％、ＳｉＯ 2 １１．５％、Ａｌ2 Ｏ3 ４．３
％、ＣａＣＯ3 ５．１％、その他夾雑物１９．５％の廃
水スラッジ（スラッジその物の組成を示す）を用いた。[Example] In a pretreatment device for seawater desalination by the reverse osmosis membrane
The wastewater sludge discharged from a double-layer filter mainly includes
Iron as a component [Composition Fe (OH)Three]
Silica (SiOTwo), Al
Mina (AlTwoOThree) And calcium carbonate (CaCOThree)
But also also colloidal organics, microorganisms, slime
And other contaminants. Here, Fe (OH)Three
59.3%, SiO Two11.5%, AlTwoOThree4.3
%, CaCOThree5.1%, 19.5% of other impurities
Water sludge (indicating the composition of the sludge itself) was used.
【００１１】そこで先ず上記組成の含有廃水５０リット
ルを容器に入れ、２日間放置してスラッジ分を沈降さ
せ、その上澄液をサイフォンで汲み上げて含水率９４％
の濃厚スラッジとし、これを試験液として用いた。この
試験液１リットルをビーカに採り、これに１２％次亜塩
素酸ナトリウム溶液５ミリリットル（次亜塩素酸臭が若
干する程度）を添加し、常温で２時間エアバブリングし
てスラッジ中の微生物及びスライムなどを酸化してスラ
ッジのべたつきを除去した。First, 50 liters of the wastewater containing the above-mentioned composition is placed in a container and left for 2 days to settle the sludge, and the supernatant is siphoned to give a water content of 94%.
Was used as a test liquid. Take 1 liter of this test solution into a beaker, add 5 ml of a 12% sodium hypochlorite solution (to the extent that the hypochlorous acid odor is slightly reduced), air-bubble at room temperature for 2 hours, and remove microorganisms and sludge from the sludge. The slime was oxidized to remove the stickiness of the sludge.
【００１２】次に３５％塩酸溶液を５Ｗ／Ｖ％になるよ
う添加し、常温で２時間エアバブリングしてスラッジ中
の鉄分を塩化第二鉄（ＦｅＣｌ3 ）にして溶解した。そ
の後小型遠心分離機を用いて塩化第二鉄溶液と酸不溶解
分を分離ろ別した。こうして得た塩化第二鉄溶液の性状
を下記表１に、また処理前の初期スラッジ及び最終処理
後の固形物（酸不溶解分）の性状を表１の参考例に示し
た。Next, a 35% hydrochloric acid solution was added to a concentration of 5 W / V%, and air bubbling was performed at room temperature for 2 hours to dissolve iron in the sludge into ferric chloride (FeCl 3 ). Thereafter, the ferric chloride solution and the acid-insoluble matter were separated and filtered using a small centrifuge. The properties of the ferric chloride solution thus obtained are shown in Table 1 below, and the properties of the initial sludge before the treatment and the solids (acid-insoluble components) after the final treatment are shown in Reference Examples of Table 1.
【００１３】表１から判るようにスラッジ中の鉄分は、
ほぼ完全に塩酸によって溶解しており、含水率９４％廃
水スラッジから塩化第二鉄（ＦｅＣｌ3 ）として５０６
００ｍｇ／リットルの濃度で再生された。As can be seen from Table 1, the iron content in the sludge is
Almost completely dissolved by hydrochloric acid, 506 as ferric chloride (FeCl 3 ) from 94% wastewater sludge.
Regenerated at a concentration of 00 mg / liter.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】本発明方法によれば、従来、逆浸透膜方
法による海水淡水化前処理装置の二層ろ過装置から排出
廃棄していた廃水スラッジから凝集剤として有用な塩化
第二鉄溶液を再生できるので、有価資源回収上極めて有
益であるばかりでなく、環境問題上からも大いに貢献で
きる。According to the method of the present invention, a ferric chloride solution useful as a flocculant is converted from wastewater sludge conventionally discharged from a two-layer filtration device of a seawater desalination pretreatment device by a reverse osmosis membrane method. Because it can be regenerated, it is not only extremely useful for recovering valuable resources, but also greatly contributes to environmental issues.
フロントページの続き (72)発明者 浜田 紘 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎造船所内 (72)発明者 吉田 博明 長崎県長崎市深堀町五丁目717番地１ 長菱エンジニアリング株式会社内 (56)参考文献 特開 昭63−205112（ＪＰ，Ａ) 特開 平２−63529（ＪＰ，Ａ) 特開 平２−270973（ＪＰ，Ａ) 特開 昭57−67027（ＪＰ，Ａ) 特開 平２−14794（ＪＰ，Ａ) 特開 昭59−36589（ＪＰ，Ａ) 特開 昭56−152707（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 21/01 C02F 11/00 - 11/20 Continuing from the front page (72) Inventor Hiroshi Hamada 1-1, Akunouramachi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor Hiroaki Yoshida 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Nagarishi Engineering (56) References JP-A-63-205112 (JP, A) JP-A-2-63529 (JP, A) JP-A-2-270973 (JP, A) JP-A-57-67027 (JP, A) A) JP-A-2-14794 (JP, A) JP-A-59-36589 (JP, A) JP-A-56-152707 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) ) B01D 21/01 C02F 11/00-11/20
Claims (1)
酸ナトリウム溶液を添加してスラッジ中の微生物、スラ
イム、有機物を酸化除去した後、塩酸溶液を添加してス
ラッジ中の鉄分を溶解して塩化第二鉄溶液とする第一工
程と、第一工程で得られた塩化第二鉄溶液をろ過機に通
して酸不溶分とろ別する第二工程よりなることを特徴と
するろ過装置の廃水スラッジから塩化第二鉄溶液を再生
する方法。1. A sodium hypochlorite solution is added to a concentrated wastewater sludge containing iron to oxidize and remove microorganisms, slime, and organic matter in the sludge, and then a hydrochloric acid solution is added to dissolve the iron in the sludge. A wastewater of a filtration device, comprising: a first step of forming a ferric chloride solution, and a second step of filtering the ferric chloride solution obtained in the first step through a filter to remove acid-insoluble components. A method of regenerating ferric chloride solution from sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28882092A JP3305012B2 (en) | 1992-10-27 | 1992-10-27 | Method for regenerating ferric chloride solution from wastewater sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28882092A JP3305012B2 (en) | 1992-10-27 | 1992-10-27 | Method for regenerating ferric chloride solution from wastewater sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06134212A JPH06134212A (en) | 1994-05-17 |
| JP3305012B2 true JP3305012B2 (en) | 2002-07-22 |
Family
ID=17735164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28882092A Expired - Fee Related JP3305012B2 (en) | 1992-10-27 | 1992-10-27 | Method for regenerating ferric chloride solution from wastewater sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3305012B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004330039A (en) * | 2003-05-06 | 2004-11-25 | Ngk Insulators Ltd | Recovery method of phosphorus and coagulant |
| JP4519878B2 (en) * | 2007-04-26 | 2010-08-04 | 財団法人塩事業センター | Filtration device |
| CZ300446B6 (en) | 2007-04-27 | 2009-05-20 | Jihoceská univerzita v Ceských Budejovicích, Zemedelská fakulta | Method of treatment of iron-containing waterworks sludge and a mixture prepared by this method |
| CN109851028B (en) * | 2019-01-31 | 2020-08-28 | 同济大学 | Method for removing chloride in water |
-
1992
- 1992-10-27 JP JP28882092A patent/JP3305012B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06134212A (en) | 1994-05-17 |
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