JPH0576900A - Method for reforming sludge containing aluminum - Google Patents
Method for reforming sludge containing aluminumInfo
- Publication number
- JPH0576900A JPH0576900A JP3243408A JP24340891A JPH0576900A JP H0576900 A JPH0576900 A JP H0576900A JP 3243408 A JP3243408 A JP 3243408A JP 24340891 A JP24340891 A JP 24340891A JP H0576900 A JPH0576900 A JP H0576900A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- aluminum
- tank
- reaction tank
- alkali
- 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.)
- Granted
Links
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- Treatment Of Sludge (AREA)
Abstract
(57)【要約】
【目的】 アルミニウム含有汚泥を効果的に減容化し
て、沈降性、濃縮性及び脱水性の良好な汚泥を得る。
【構成】 アルミニウム含有凝集汚泥の一部を酸で溶解
すると共に、残部をアルカリで溶解し、得られた酸溶解
液とアルカリ溶解液とを反応槽内で混合して不溶化物を
生成させた後固液分離する。分離した不溶化物の一部は
前記反応槽に返送する。
【効果】 少ない薬剤使用量にて、高濃度で極めて沈降
性、濃縮性及び脱水性の良い汚泥が得られる。濃縮処理
のみで、脱水ケーキよりも低含水率の汚泥とすることが
できるので、脱水機を不要ないし縮減される。汚泥中の
アルミニウムを回収、再利用する場合の乾燥コストも大
幅に低減される。脱水ケーキとして処分する場合も、汚
泥容量が小さく、安価でハンドリング性に優れる。
(57) [Summary] [Purpose] To effectively reduce the volume of aluminum-containing sludge to obtain sludge having good sedimentation, concentration and dewatering properties. [Structure] After dissolving a part of the aluminum-containing coagulated sludge with an acid and the rest with an alkali, and mixing the obtained acid solution and alkali solution in a reaction tank to form an insoluble matter. Solid-liquid separation. A part of the separated insoluble matter is returned to the reaction tank. [Effect] With a small amount of chemicals used, it is possible to obtain sludge with a high concentration and excellent sedimentation, concentration and dewatering properties. Since the sludge having a water content lower than that of the dehydrated cake can be obtained only by the concentration treatment, the dehydrator is not necessary or reduced. Drying costs for recovering and reusing aluminum in sludge are also greatly reduced. Even when it is disposed as a dehydrated cake, the sludge volume is small, the cost is low, and the handling is excellent.
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミニウム含有汚泥の
改質方法に係り、特に、アルミニウム含有汚泥の減容化
を目的として、アルミニウム含有汚泥を再溶解、再凝集
沈殿処理することにより、極めて沈降性、濃縮性及び脱
水性の良い汚泥に改質する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reforming an aluminum-containing sludge, and in particular, for the purpose of reducing the volume of the aluminum-containing sludge, the aluminum-containing sludge is re-dissolved and re-aggregated to cause a significant sedimentation. The present invention relates to a method for reforming sludge having excellent properties, thickening properties and dewatering properties.
【０００２】[0002]
【従来の技術】従来、アルミニウム含有廃水の処理方法
としては、廃水中に中和剤を添加して、ｐＨ６〜８程度
とし、アルミニウムを水酸化アルミニウムとして沈降さ
せ、凝集分離する方法がある。2. Description of the Related Art Conventionally, as a method for treating aluminum-containing wastewater, there is a method in which a neutralizing agent is added to the wastewater to adjust the pH to about 6 to 8 and aluminum is precipitated as aluminum hydroxide to coagulate and separate.
【０００３】しかしながら、この方法で得られるアルミ
ニウム含有汚泥は、固形物（ＳＳ）濃度が高くても１０
ｇ／リットル（以下「lit.」と記す。）程度と非常に低
濃度で、脱水してもＳＳ濃度は１０〜２０％程度にしか
ならない、極めて沈降性、濃縮性、脱水性の悪い汚泥で
ある。However, the aluminum-containing sludge obtained by this method has a high solid matter (SS) concentration of 10%.
The sludge has a very low concentration of about g / liter (hereinafter referred to as "lit."), and the SS concentration is only about 10 to 20% even after dehydration. is there.
【０００４】このようなアルミニウム含有廃水の処理に
おける改良技術として、従来、次のような方法が提案さ
れている。The following methods have been conventionally proposed as improved techniques for treating such aluminum-containing wastewater.
【０００５】 水酸化アルミニウムにアルカリを添加
してアルカリ処理アルミニウム沈殿を得、これを酸性ア
ルミニウム含有廃水と混合反応させる方法（特公昭４９
−３６８７９号）。A method in which an alkali is added to aluminum hydroxide to obtain an alkali-treated aluminum precipitate, which is mixed and reacted with acidic aluminum-containing wastewater (Japanese Patent Publication No. Sho 49).
-36879).
【０００６】 凝集分離した汚泥の一部に酸に添加し
て溶解させたものを、凝集反応槽に返送する方法（特開
平２−１５７００５号）。A method in which a part of sludge that has been coagulated and separated and added to an acid and dissolved therein is returned to the coagulation reaction tank (JP-A-2-157005).
【０００７】[0007]
【発明が解決しようとする課題】上記の方法では、ア
ルカリ処理アルミニウム沈殿の生成のための反応槽及び
酸性アルミニウム含有廃水の反応のための反応槽と、反
応槽が少なくとも２槽必要であり、各槽のｐＨ制御な
ど、装置設備面で複雑であるという欠点がある。しか
も、アルカリによる改質効果も十分満足し得るものでは
ない。因みに、特公昭４９−３６８７９号に記載される
実施例の結果によると、得られる汚泥のＳＳ濃度は最良
でも４０ｇ／lit.程度である。In the above method, at least two reaction tanks are required, a reaction tank for the production of alkali-treated aluminum precipitate and a reaction tank for the reaction of acidic aluminum-containing wastewater. There is a drawback in that it is complicated in terms of equipment such as pH control of the tank. Moreover, the modifying effect of alkali is not sufficiently satisfactory. Incidentally, according to the results of the examples described in JP-B-49-36879, the SS concentration of the obtained sludge is about 40 g / lit.
【０００８】一方、上記の方法は、汚泥を返送する方
法ではあるが、酸添加により汚泥を溶解してから廃水処
理系の反応槽に送給する。即ち、の方法は凝集剤の再
利用に関するものであって、汚泥の改質効果は得られな
い。On the other hand, although the above method is a method of returning sludge, the sludge is dissolved by addition of acid and then fed to the reaction tank of the wastewater treatment system. That is, the method (1) relates to the reuse of the flocculant, and the sludge modifying effect cannot be obtained.
【０００９】このように、従来において、ＳＳ濃度が高
く、沈降性、濃縮性及び脱水性に優れた汚泥を得ること
ができる方法は提案されておらず、その改良が望まれて
いる。As described above, conventionally, no method has been proposed which can obtain sludge having a high SS concentration and excellent settling property, concentrating property and dewatering property, and its improvement is desired.
【００１０】本発明は上記従来の実情に鑑みてなされた
ものであって、アルミニウム含有汚泥を効果的に減容化
して、沈降性、濃縮性及び脱水性の良好な汚泥を得るこ
とができるアルミニウム含有汚泥の改質方法を提供する
ことを目的とする。The present invention has been made in view of the above-mentioned conventional circumstances, and aluminum capable of effectively reducing the volume of aluminum-containing sludge to obtain sludge having good settling property, concentrating property and dewatering property. It is an object to provide a method for modifying contained sludge.
【００１１】[0011]
【課題を解決するための手段】本発明のアルミニウム含
有汚泥の改質方法は、アルミニウム含有汚泥の一部を酸
で溶解すると共に、残部をアルカリで溶解し、得られた
酸溶解液とアルカリ溶解液とを反応槽内で混合して不溶
化物を生成させた後固液分離するアルミニウム含有汚泥
の改質方法であって、該分離した不溶化物の一部を前記
反応槽に返送することを特徴とする。The method for reforming an aluminum-containing sludge according to the present invention is to dissolve a part of an aluminum-containing sludge with an acid and the rest with an alkali to obtain an acid solution and an alkali solution. A method for reforming an aluminum-containing sludge, which comprises solid-liquid separation after mixing an insoluble matter with a liquid in a reaction vessel, wherein a part of the separated insoluble matter is returned to the reaction vessel. And
【００１２】以下に本発明を図面を参照して詳細に説明
する。図１は本発明のアルミニウム含有汚泥の改質方法
の一実施方法を示す系統図、図２はアルミニウム塩を用
いた凝集沈殿処理法を示す系統図である。The present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram showing an implementation method of the aluminum-containing sludge reforming method of the present invention, and FIG. 2 is a system diagram showing a coagulating sedimentation treatment method using an aluminum salt.
【００１３】まず、図２に示す凝集沈殿処理法について
説明する。第２図において、１は反応槽、２，３は凝集
槽であり、各々、撹拌機１Ａ，２Ａ，３Ａを備える。４
は沈殿槽である。１１は原水を反応槽１に導入する配
管、１２は反応槽１内の液を凝集槽に送給する配管、１
３は沈殿槽４で分離された上澄水を処理水として排出す
る配管、１４は汚泥を排出する配管である。１５は反応
槽１にアルミニウム塩を供給する配管である。１６は後
述の汚泥改質工程の分離水の返送配管である。First, the coagulating sedimentation treatment method shown in FIG. 2 will be described. In FIG. 2, 1 is a reaction tank and 2 and 3 are aggregating tanks, which are equipped with stirrers 1A, 2A and 3A, respectively. Four
Is a settling tank. Reference numeral 11 is a pipe for introducing raw water into the reaction tank 1, 12 is a pipe for feeding the liquid in the reaction tank 1 to the coagulation tank, 1
Reference numeral 3 is a pipe for discharging the supernatant water separated in the settling tank 4 as treated water, and 14 is a pipe for discharging sludge. Reference numeral 15 is a pipe for supplying the aluminum salt to the reaction tank 1. Reference numeral 16 is a return pipe for separated water in the sludge reforming step described later.
【００１４】図示の方法において、原水は、配管１１よ
り反応槽１に導入され、反応槽１内にて配管１６を経て
返送された後述の汚泥改質工程の分離水が添加されると
共に、配管１５よりアルミニウム塩が添加される。反応
槽１内の液は、次いで、配管１２より凝集槽２、更に凝
集槽３に送給され、凝集槽２、３内で凝集処理される。
凝集槽２、３内で凝集処理されら液は、更に、沈殿槽４
に流入して濃縮沈殿処理される。しかして、沈殿槽４の
上澄水は処理水として配管１３より排出される。一方、
沈殿槽４から、配管１４を経て抜き出された汚泥は、図
１に示す汚泥改質工程に送給される。In the illustrated method, the raw water is introduced into the reaction tank 1 through the pipe 11, and the separated water in the sludge reforming process, which will be described later, returned through the pipe 16 in the reaction tank 1 is added to the raw water. Aluminum salt is added from 15. The liquid in the reaction tank 1 is then fed from the pipe 12 to the aggregating tank 2 and further to the aggregating tank 3, and is subjected to aggregating treatment in the aggregating tanks 2 and 3.
The liquid that has been subjected to the coagulation treatment in the coagulation tanks 2 and 3 is further subjected to the precipitation tank
And concentrated and precipitated. Then, the supernatant water of the settling tank 4 is discharged from the pipe 13 as treated water. on the other hand,
The sludge extracted from the settling tank 4 through the pipe 14 is fed to the sludge reforming step shown in FIG.
【００１５】次に図１に示す汚泥改質方法について説明
する。図１において、２１は酸溶解槽、２２はアルカリ
溶解槽、２３は中和反応槽、２４、２５は凝集槽であっ
て、それぞれ撹拌槽２１Ａ、２２Ａ、２３Ａ、２４Ａ、
２５Ａを備える。２６は沈殿槽である。１４Ａ、１４Ｂ
はそれぞれ図２の汚泥抜き出し配管１４から分岐して汚
泥を酸溶解槽２１、アルカリ溶解槽２２に送給する配管
である。３１は酸溶解槽２１の酸溶解液を中和反応槽２
３に送給する配管、３２はアルカリ溶解槽２２のアルカ
リ溶解液を中和反応槽２３に送給する配管である。３３
は中和反応槽２３の液を凝集槽２４に送給する配管、１
６は沈殿槽２６の分離水を前述した図２の反応槽１に送
給する配管である。３４は沈殿槽２６から汚泥を抜き出
す配管であり、汚泥の一部を中和反応槽２３に返送す
る、ポンプ３５を備える配管３４Ａと、系外に汚泥を排
出する配管３４Ｂとに分岐している。３６は酸溶解槽２
１に酸を添加する配管、３７はアルカリ溶解槽２２にア
ルカリを添加する配管、３８は凝集槽２４に凝集剤を添
加する配管である。Next, the sludge reforming method shown in FIG. 1 will be described. In FIG. 1, 21 is an acid dissolution tank, 22 is an alkali dissolution tank, 23 is a neutralization reaction tank, and 24 and 25 are aggregating tanks, and stirring tanks 21A, 22A, 23A, 24A, respectively.
25A. 26 is a settling tank. 14A, 14B
2 are pipes branching from the sludge extraction pipe 14 of FIG. 2 to feed the sludge to the acid dissolution tank 21 and the alkali dissolution tank 22, respectively. 31 is the neutralization reaction tank 2 for the acid solution in the acid dissolution tank 21
Reference numeral 3 denotes a pipe for supplying the alkali-dissolved liquid in the alkali dissolution tank 22 to the neutralization reaction tank 23. 33
Is a pipe for feeding the liquid in the neutralization reaction tank 23 to the coagulation tank 24, 1
Reference numeral 6 is a pipe for feeding the separated water from the settling tank 26 to the reaction tank 1 shown in FIG. Reference numeral 34 is a pipe for extracting the sludge from the settling tank 26, and is branched into a pipe 34A having a pump 35 for returning a part of the sludge to the neutralization reaction tank 23 and a pipe 34B for discharging the sludge to the outside of the system. .. 36 is an acid dissolution tank 2
Reference numeral 1 is a pipe for adding an acid, 37 is a pipe for adding an alkali to the alkali dissolving tank 22, and 38 is a pipe for adding an aggregating agent to the aggregating tank 24.
【００１６】図１の方法においては、図２の沈殿槽４か
ら配管１４により抜き出された汚泥を２分し、一部を配
管１４Ａより酸溶解槽２１に、残部を配管１４Ｂよりア
ルカリ溶解槽２２に送給する。In the method of FIG. 1, the sludge extracted from the settling tank 4 of FIG. 2 through the pipe 14 is divided into two parts, a part of which is connected to the acid dissolving tank 21 through the pipe 14A and the rest of which is connected through the pipe 14B to the alkali dissolving tank. Send to 22.
【００１７】酸溶解槽２１においては、配管３６より酸
が添加され、汚泥が溶解される。一方、アルカリ溶解槽
２２においては、配管３７よりアルカリが添加され、汚
泥が溶解される。なお、ここで使用される酸又はアルカ
リにはアルミニウムを溶解させるものであれば良く、特
に制限はない。通常の場合、硫酸、硝酸、塩酸等の酸、
又は、水酸化ナトリウム、炭酸ナトリウム、水酸化カル
シウム等のアルカリが使用される。In the acid dissolving tank 21, acid is added through the pipe 36 to dissolve sludge. On the other hand, in the alkali dissolution tank 22, alkali is added through the pipe 37 to dissolve the sludge. The acid or alkali used here is not particularly limited as long as it can dissolve aluminum. Usually, acids such as sulfuric acid, nitric acid, hydrochloric acid,
Alternatively, an alkali such as sodium hydroxide, sodium carbonate or calcium hydroxide is used.
【００１８】酸溶解槽２１内の酸溶解液及びアルカリ溶
解槽２２内のアルカリ溶解液は、それぞれ、配管３１、
３２より中和反応槽２３に送給され、中和反応槽２３内
にて、沈殿槽２６より配管３４Ａを経て返送された汚泥
と共に混合される。The acid solution in the acid solution tank 21 and the alkali solution in the alkali solution tank 22 are respectively connected to the pipe 31,
32 is fed to the neutralization reaction tank 23, and is mixed in the neutralization reaction tank 23 with the sludge returned from the settling tank 26 through the pipe 34A.
【００１９】本発明において、この中和反応槽２３内の
液のｐＨは、好ましくは５．８〜７．２の範囲となるよ
うに、酸溶解液及びアルカリ溶解液の流入量を調整す
る。また、返送汚泥量は多い程好ましいことから、中和
反応槽２３内の固形物（ＳＳ）濃度が、好ましくは１０
０ｇ／lit.以上、 より好ましくは２００ｇ／lit.以上と
なるように返送汚泥量を調整する。更に、中和反応槽２
３に流入する液の、中和反応槽２３内の滞留時間が好ま
しくは１０分以上となるように、流入溶解液及び返送汚
泥量に対して中和反応槽２３の容量を選定する。中和反
応槽２３のｐＨ、ＳＳ濃度、滞留時間を上記条件に調整
することにより、沈降性、濃縮性及び脱水性がより一層
良好な汚泥が得られる。In the present invention, the inflow amount of the acid solution and the alkali solution is adjusted so that the pH of the solution in the neutralization reaction tank 23 is preferably in the range of 5.8 to 7.2. Further, the larger the amount of sludge to be returned, the more preferable it is. Therefore, the solid matter (SS) concentration in the neutralization reaction tank 23 is preferably 10
The amount of sludge to be returned is adjusted so as to be 0 g / lit. Or more, more preferably 200 g / lit. Or more. Furthermore, the neutralization reaction tank 2
The capacity of the neutralization reaction tank 23 is selected with respect to the amount of the inflowing solution and the amount of returned sludge so that the residence time of the liquid flowing into No. 3 in the neutralization reaction tank 23 is preferably 10 minutes or more. By adjusting the pH, SS concentration, and residence time of the neutralization reaction tank 23 to the above conditions, sludge having even better sedimentation, concentration and dehydration properties can be obtained.
【００２０】本実施例の方法においては、中和反応槽２
３内の液は、次いで、配管３３より凝集槽２４に送給さ
れ、凝集槽２４内で配管３８より凝集剤が添加されて凝
集処理される。ここで、使用される凝集剤としては、特
に制限はないが、一般には高分子凝集剤が好ましい。高
分子凝集剤としては、ノニオン系、アニオン系、カチオ
ン系のいずれも適用可能であるが、通常の場合、ノニオ
ン系、アニオン系が効果的である。In the method of this embodiment, the neutralization reaction tank 2
Next, the liquid in 3 is fed to the flocculation tank 24 through the pipe 33, and the flocculating agent is added through the pipe 38 in the flocculation tank 24 to perform the flocculation treatment. Here, the aggregating agent used is not particularly limited, but a polymer aggregating agent is generally preferable. As the polymer flocculant, any of a nonionic type, an anionic type and a cationic type can be applied, but in general, a nonionic type and an anionic type are effective.
【００２１】凝集槽２４内で凝集処理された液は、更
に、凝集槽２５に送給されて十分に凝集処理された後、
沈殿槽２６に流入して濃縮沈殿処理される。しかして、
沈殿槽２６の分離水は配管１６より、図２の反応槽１に
返送され、原水と共に処理される。一方、沈殿槽２６か
ら、配管３４を経て抜き出された汚泥は、その一部が配
管３４Ａより中和反応槽２３に返送され、残部は配管３
４Ｂより系外に排出され、脱水、乾燥処理等に付され
る。The liquid which has been subjected to the coagulation treatment in the coagulation tank 24 is further fed to the coagulation tank 25 to be sufficiently coagulated, and thereafter,
It flows into the settling tank 26 and is concentrated and settled. Then,
The separated water in the settling tank 26 is returned to the reaction tank 1 of FIG. 2 through the pipe 16 and treated together with the raw water. On the other hand, a part of the sludge extracted from the settling tank 26 through the pipe 34 is returned to the neutralization reaction tank 23 through the pipe 34A, and the rest is the pipe 3
It is discharged from the system 4B and subjected to dehydration, drying treatment and the like.
【００２２】なお、図示の実施方法は、本発明の一実施
例であって、本発明は何ら図示の方法に限定されるもの
ではない。The illustrated method is an embodiment of the present invention, and the present invention is not limited to the illustrated method.
【００２３】例えば、凝集槽２４、２５は必ずしも必要
とされず、中和反応槽２３内の液は直接沈殿槽２６に供
給しても良い。しかしながら、凝集槽２４、２５を設け
て凝集剤を添加して凝集処理を行なった後、沈殿処理す
ることにより、汚泥の沈殿性や分離水の清澄性が向上す
るため、本発明に極めて有効である。For example, the flocculation tanks 24 and 25 are not always necessary, and the liquid in the neutralization reaction tank 23 may be directly supplied to the precipitation tank 26. However, since the flocculating tanks 24 and 25 are provided and the flocculating agent is added to perform the flocculating treatment and then the precipitating treatment improves the sludge's settling property and the clarity of the separated water, it is extremely effective for the present invention. is there.
【００２４】また、沈殿槽２６は上澄水の分離と汚泥の
濃縮を目的とするものであるから、本発明においては、
沈殿槽２６の替りに膜分離装置、例えば、ＭＦ（精密濾
過）、ＵＦ（限外濾過）膜分離装置を用いても良い。Further, since the settling tank 26 is for the purpose of separating supernatant water and concentrating sludge, in the present invention,
Instead of the settling tank 26, a membrane separation device, for example, MF (microfiltration) or UF (ultrafiltration) membrane separation device may be used.
【００２５】このような本発明のアルミニウム含有汚泥
の改質方法は、アルミニウムを含有する汚泥であれば良
く、図１に示すアルミニウム塩を用いた凝集沈殿処理汚
泥に限らず、アルミニウム塩を使用しない凝集沈殿処理
汚泥であっても適用可能である。即ち、原水中にアルミ
ニウムが含まれる場合には、アルミニウム塩を添加する
ことなく、アルミニウム含有汚泥が得られる。その他、
本発明の方法は、除濁を目的とした凝集沈殿汚泥以外に
も、例えば、フッ素を吸着した汚泥や食品・医薬工場な
どのアルミニウム含有汚泥、更には、リン除去のリン酸
アルミニウム含有汚泥等の減容化にも適用可能である。Such a method for reforming an aluminum-containing sludge of the present invention may be any sludge containing aluminum, and is not limited to the coagulation-sedimentation sludge using an aluminum salt shown in FIG. 1 and does not use an aluminum salt. Even sludge treated with coagulating sedimentation can be applied. That is, when the raw water contains aluminum, the aluminum-containing sludge can be obtained without adding an aluminum salt. Other,
The method of the present invention, in addition to the coagulation sedimentation sludge for the purpose of turbidity, for example, aluminum-containing sludge such as fluorine-adsorbed sludge and food / pharmaceutical factories, further, aluminum phosphate-containing sludge for phosphorus removal, etc. It can also be applied to volume reduction.
【００２６】[0026]
【作用】本発明においては、アルミニウム含有汚泥を酸
及びアルカリを用いて各々溶解し（下記反応式、
）、両溶解液を反応槽にて混合中和して再凝集沈殿処
理するにあたり（下記反応式）、分離された汚泥を種
晶として反応槽に返送する。これにより、返送汚泥を核
として、反応槽で生成する水酸化アルミニウムがその表
面に折出することにより、汚泥が改質造粒され、沈降
性、濃縮性及び脱水性に優れた汚泥が得られる。In the present invention, the aluminum-containing sludge is dissolved using acid and alkali (reaction formula below,
), When both solutions are mixed and neutralized in the reaction tank to perform re-aggregation and precipitation treatment (reaction formula below), the separated sludge is returned to the reaction tank as seed crystals. With this, the aluminum sludge produced in the reaction tank breaks out on the surface with the returned sludge as the nucleus, so that the sludge is reformed and granulated, and sludge excellent in sedimentation, concentration and dehydration is obtained. ..
【００２７】 ２Ａｌ（ＯＨ）3 ＋３Ｈ2 ＳＯ4 →Ａｌ2 （ＳＯ4 ）3 ＋６Ｈ2 Ｏ… ６Ａｌ（ＯＨ）3 ＋６ＮａＯＨ→６ＮａＡｌＯ2 ＋１２Ｈ2 Ｏ… Ａｌ2 （ＳＯ4 ）3 ＋６ＮａＡｌＯ2 ＋１２Ｈ2 Ｏ →８Ａｌ（ＯＨ）3 ＋３Ｎａ2 ＳＯ4 … ところで、本発明の方法においては、汚泥を２分して、
それぞれ酸又はアルカリで溶解した後、混合中和するた
め、薬剤使用量を低減することができる。2Al (OH) 3 + 3H 2 SO 4 → Al 2 (SO 4 ) 3 + 6H 2 O ... 6Al (OH) 3 + 6NaOH → 6NaAlO 2 + 12H 2 O ... Al 2 (SO 4 ) 3 + 6NaAlO 2 + 12H 2 O → 8Al (OH) 3 + 3Na 2 SO 4 ... Meanwhile, in the method of the present invention, and 2 minutes sludge,
Since they are each dissolved with an acid or an alkali and then mixed and neutralized, the amount of the drug used can be reduced.
【００２８】即ち、例えば、汚泥の全量を酸のみで溶解
する場合、汚泥中に含まれるアルミニウムと等当量の酸
が必要であり（下記反応式）、その後、溶解汚泥を中
和するために、更に等当量のアルカリが必要になる。従
って、酸とアルカリとをそれぞれ汚泥中のアルミニウム
に対して１当量ずつ必要となる。That is, for example, when the entire amount of sludge is dissolved only with an acid, an acid equivalent to aluminum contained in the sludge is required (the following reaction formula), and thereafter, in order to neutralize the dissolved sludge, Furthermore, an equivalent amount of alkali is required. Therefore, 1 equivalent of acid and 1 equivalent of alkali are required for each aluminum contained in the sludge.
【００２９】一方、本発明に従って、酸とアルカリとを
用いて別々に溶解する場合には、上記反応式で示され
るように、アルカリ（例えばＮａＯＨ）は、アルミニウ
ムの１／３当量で良いことから、汚泥を２等分して各々
溶解処理すると、薬剤費は汚泥の全量を酸で溶解した後
アルカリで中和する場合の１／４の量で良いことにな
る。（なお、汚泥の全量をアルカリで溶解させた後、酸
で中和する場合には、汚泥の全量を酸で溶解した後アル
カリで中和する場合の３／４の量である。）従って、本
発明によれば薬剤コストが低減され、低コスト処理が可
能とされる。On the other hand, according to the present invention, when the acid and the alkali are separately dissolved, the alkali (eg, NaOH) may be 1/3 equivalent of aluminum, as shown in the above reaction formula. If the sludge is divided into two equal parts and dissolved, the chemical cost will be 1/4 of the total amount of the sludge that is dissolved in acid and then neutralized with alkali. (Note that when the whole amount of sludge is dissolved with an alkali and then neutralized with an acid, the amount is 3/4 that in the case where the whole amount of sludge is dissolved with an acid and then neutralized with an alkali.) According to the present invention, the drug cost is reduced and low cost processing is possible.
【００３０】[0030]
【実施例】以下に実施例、比較例及び参考例を挙げて、
本発明をより具体的に説明する。[Examples] Examples, comparative examples and reference examples are given below,
The present invention will be described more specifically.
【００３１】比較例１ 厚木市水に硫酸バンドを添加してアルミニウム濃度４．
０５ｇ／lit.とした原水を、反応槽（容量０．５lit.）
に０．１lit.／ｈｒで通水し、反応槽内で５０ｇ／lit.
ＮａＯＨ水溶液を加えてｐＨ６．５に調整した。その
後、沈殿槽（内径／５０ｍｍ）で固液分離した。Comparative Example 1 Aluminum concentration was obtained by adding a sulfuric acid band to Atsugi city water.
Raw water of 05 g / lit. Was added to the reaction tank (volume 0.5 lit.).
Water at 0.1 lit./hr, and 50 g / lit. In the reaction tank.
The pH was adjusted to 6.5 by adding an aqueous NaOH solution. Then, solid-liquid separation was performed in a settling tank (inner diameter / 50 mm).
【００３２】沈殿槽から得られた汚泥を３０分静置した
後、ＳＳ濃度を測定したところ、８．０／lit.であっ
た。After the sludge obtained from the settling tank was allowed to stand for 30 minutes, the SS concentration was measured and found to be 8.0 / lit.
【００３３】実施例１ 比較例１で得られた汚泥を２分し、一方にＨ2 ＳＯ4 を
１５ｇ／lit.加え、他方にＮａＯＨを８ｇ／lit.加えて
それぞれ溶解した。次に、比較例１で用いたと同様の反
応槽及び沈殿槽により処理した。Example 1 The sludge obtained in Comparative Example 1 was divided into 2 parts, and H 2 SO 4 was added at 15 g / lit. To one side and NaOH at 8 g / lit. Next, the same reaction tank and precipitation tank as used in Comparative Example 1 were used for treatment.
【００３４】即ち、反応槽にＨ2 ＳＯ4 溶解液を０．１
lit.／ｈｒの一定流量で通水すると共にＮａＯＨ溶解液
を中和剤として自動注入させ、また、沈殿槽から１lit.
／ｈｒの流量で汚泥を反応槽に返送した。That is, 0.1% of H 2 SO 4 solution was added to the reaction tank.
Water is passed at a constant flow rate of lit./hr and a NaOH solution is automatically injected as a neutralizing agent, and 1 lit.
The sludge was returned to the reaction tank at a flow rate of / hr.
【００３５】連続運転７日後の反応槽出口液を採取し、
３０分静置後のＳＳ濃度を測定したところ、４４０ｇ／
lit.であった。The reaction vessel outlet liquid after 7 days of continuous operation was collected,
When the SS concentration after standing for 30 minutes was measured, it was 440 g /
It was lit.
【００３６】参考例１ 比較例１及び実施例１で得られた沈殿槽汚泥をそれぞれ
真空脱水機（４００ｍｍＨｇ）で脱水し、得られた脱水
ケーキの含水率を測定した。結果を表１に示す。Reference Example 1 The settling tank sludges obtained in Comparative Example 1 and Example 1 were dehydrated with a vacuum dehydrator (400 mmHg), and the water content of the dehydrated cake obtained was measured. The results are shown in Table 1.
【００３７】[0037]
【表１】 [Table 1]
【００３８】以上の結果から、本発明のアルミニウム含
有汚泥の改質方法によれば、沈降性、濃縮性及び脱水性
に優れた高濃度汚泥が得られることが明らかである。From the above results, it is clear that according to the method for modifying an aluminum-containing sludge of the present invention, a high-concentration sludge excellent in sedimentation, concentration and dehydration can be obtained.
【００３９】[0039]
【発明の効果】以上詳述した通り、本発明のアルミニウ
ム含有汚泥の改質方法によれば、少ない薬剤使用量に
て、高濃度で極めて沈降性、濃縮性及び脱水性の良い汚
泥が低コスト、かつ効率的に得られる。本発明の方法に
より得られる汚泥は、濃縮処理のみで、従来法において
汚泥を脱水処理して得られた脱水ケーキよりも低含水率
の汚泥とすることができる。これにより、脱水機を不要
ないし縮減することが可能とされる。また、このよう
に、含水率の低い汚泥が得られることから、汚泥中のア
ルミニウムを回収、再利用する場合の乾燥コストも大幅
に低減される。更に、脱水ケーキとして処分する場合に
おいても、汚泥容量が少ないことから、安価に処理する
ことができ、ハンドリングも極めて容易である。As described in detail above, according to the method for reforming an aluminum-containing sludge of the present invention, a sludge having a high concentration, an excellent settling property, a concentrating property and a good dewatering property can be produced at a low cost with a small amount of chemicals used. And efficiently. The sludge obtained by the method of the present invention can be made into a sludge having a lower water content than the dehydrated cake obtained by dehydrating the sludge in the conventional method only by the concentration treatment. This makes it possible to eliminate or reduce the dehydrator. Further, since the sludge having a low water content is obtained in this way, the drying cost for recovering and reusing aluminum in the sludge is also significantly reduced. Further, even when it is disposed as a dehydrated cake, the sludge volume is small, so that it can be processed at low cost and handling is extremely easy.
【図１】本発明のアルミニウム含有汚泥の改質方法の一
実施方法を示す系統図である。FIG. 1 is a system diagram showing an implementation method of an aluminum-containing sludge reforming method of the present invention.
【図２】アルミニウム塩を用いた凝集沈殿処理法を示す
系統図である。FIG. 2 is a system diagram showing a coagulating sedimentation treatment method using an aluminum salt.
１ 反応槽 ２，３ 凝集槽 ４ 沈殿槽 ２１ 酸溶解槽 ２２ アルカリ溶解槽 ２３ 中和反応槽 ２４、２５ 凝集槽 ２６ 沈殿槽 1 Reaction tank 2,3 Coagulation tank 4 Precipitation tank 21 Acid dissolution tank 22 Alkali dissolution tank 23 Neutralization reaction tank 24,25 Coagulation tank 26 Precipitation tank
Claims (1)
すると共に、残部をアルカリで溶解し、得られた酸溶解
液とアルカリ溶解液とを反応槽内で混合して不溶化物を
生成させた後固液分離するアルミニウム含有汚泥の改質
方法であって、該分離した不溶化物の一部を前記反応槽
に返送することを特徴とするアルミニウム含有汚泥の改
質方法。1. An aluminum-containing sludge is partially dissolved with an acid, and the rest is dissolved with an alkali, and the obtained acid-dissolved liquid and alkali-dissolved liquid are mixed in a reaction tank to form an insoluble matter. A method for reforming an aluminum-containing sludge that is subjected to post-solid-liquid separation, wherein a part of the separated insoluble matter is returned to the reaction tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03243408A JP3109166B2 (en) | 1991-09-24 | 1991-09-24 | Method for reforming sludge containing aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03243408A JP3109166B2 (en) | 1991-09-24 | 1991-09-24 | Method for reforming sludge containing aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0576900A true JPH0576900A (en) | 1993-03-30 |
| JP3109166B2 JP3109166B2 (en) | 2000-11-13 |
Family
ID=17103420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03243408A Expired - Fee Related JP3109166B2 (en) | 1991-09-24 | 1991-09-24 | Method for reforming sludge containing aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3109166B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11114598A (en) * | 1997-10-15 | 1999-04-27 | Kurita Water Ind Ltd | Treatment method for aluminum-containing sludge |
| JP2003001012A (en) * | 2001-06-19 | 2003-01-07 | Hitachi Plant Eng & Constr Co Ltd | Coagulation sedimentation treatment method and treatment method for sedimentation sludge |
| CN102531328A (en) * | 2012-01-09 | 2012-07-04 | 济南大学 | Composite inorganic polymeric sludge dehydration conditioner prepared from blast-furnace metallurgical slag |
| CN116174461A (en) * | 2023-02-28 | 2023-05-30 | 江苏科技大学 | A treatment method for recycling waste mud soil |
-
1991
- 1991-09-24 JP JP03243408A patent/JP3109166B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11114598A (en) * | 1997-10-15 | 1999-04-27 | Kurita Water Ind Ltd | Treatment method for aluminum-containing sludge |
| JP2003001012A (en) * | 2001-06-19 | 2003-01-07 | Hitachi Plant Eng & Constr Co Ltd | Coagulation sedimentation treatment method and treatment method for sedimentation sludge |
| CN102531328A (en) * | 2012-01-09 | 2012-07-04 | 济南大学 | Composite inorganic polymeric sludge dehydration conditioner prepared from blast-furnace metallurgical slag |
| CN116174461A (en) * | 2023-02-28 | 2023-05-30 | 江苏科技大学 | A treatment method for recycling waste mud soil |
| CN116174461B (en) * | 2023-02-28 | 2025-05-30 | 江苏科技大学 | A method for processing waste mud soil resources |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3109166B2 (en) | 2000-11-13 |
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