JPH0576875A - Insolubilization of aluminum - Google Patents
Insolubilization of aluminumInfo
- Publication number
- JPH0576875A JPH0576875A JP24340791A JP24340791A JPH0576875A JP H0576875 A JPH0576875 A JP H0576875A JP 24340791 A JP24340791 A JP 24340791A JP 24340791 A JP24340791 A JP 24340791A JP H0576875 A JPH0576875 A JP H0576875A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- reaction tank
- tank
- aluminum
- concentration
- 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
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミニウムの不溶化方
法に係り、特に、アルミニウム含有水に酸又はアルカリ
を添加して凝集処理し、生成した汚泥を分離除去する方
法において、沈降性、濃縮性及び脱水性の良好な汚泥を
生成させて、効率的な処理を行なうことを可能とするア
ルミニウムの不溶化方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for insolubilizing aluminum, and more particularly to a method for separating and removing sludge produced by adding an acid or an alkali to aluminum-containing water to perform coagulation treatment. The present invention relates to a method for insolubilizing aluminum, which makes it possible to generate sludge having a good dehydration property and perform efficient treatment.
【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、汚泥濃度の改善効果は得られない。On the other hand, although the above method is a method of returning sludge, the sludge is dissolved by addition of an acid and then fed to the reaction tank. That is, the method (1) relates to the reuse of the flocculant, and cannot improve the sludge concentration.
【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
ができるアルミニウムの不溶化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 for insolubilizing aluminum 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、アルミニウム含有水を凝集処理し、生成
した汚泥を分離除去する方法において、沈降性、濃縮性
及び脱水性の良好な汚泥を生成させて、効率的な処理を
行なうことを可能とするアルミニウムの不溶化方法を提
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 in a method of coagulating aluminum-containing water and separating and removing the produced sludge, the sludge having good settling property, concentrating property and dewatering property is obtained. It is an object of the present invention to provide a method of insolubilizing aluminum that enables the generation of aluminum and perform efficient treatment.
【００１１】[0011]
【課題を解決するための手段】本発明のアルミニウムの
不溶化方法は、アルミニウム含有水を反応槽内で不溶化
反応させた後、固液分離処理し、分離した不溶化物の一
部を反応槽に返送する方法において、反応槽のｐＨを
５．８〜７．２に調整し、かつ、反応槽内の固形物濃度
が１００ｇ／lit.以上となるように前記分離した不溶化
物を返送するとともに、反応槽に流入する液の反応槽滞
留時間を１０分以上とすることを特徴とする。The method for insolubilizing aluminum according to the present invention comprises the steps of insolubilizing aluminum-containing water in a reaction tank, followed by solid-liquid separation treatment, and returning a part of the separated insolubilized product to the reaction tank. In the method, the pH of the reaction tank is adjusted to 5.8 to 7.2, and the separated insoluble matter is returned so that the solid content in the reaction tank becomes 100 g / lit. The reaction tank residence time of the liquid flowing into the tank is set to 10 minutes or more.
【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の不溶化方法の一実
施方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 insolubilization method of the present invention.
【００１３】図中、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。しかして、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、
１３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り、一部を反
応槽１に返送するポンプ１５を備える配管１４Ａと、残
部を系外へ排出する配管１４Ｂとに分岐している。１６
は反応槽１に中和剤を供給する配管、１７は凝集槽２に
凝集剤を送給する配管である。In the figure, 1 is a reaction tank, and 2 and 3 are aggregating tanks, each equipped with stirrers 1A, 2A and 3A. 4 is a settling tank. Then, 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,
Reference numeral 13 is a pipe for discharging the supernatant water separated in the settling tank 4 as treated water, 14 is a pipe for discharging sludge, and a pipe 14A having a pump 15 for returning a part of the sludge to the reaction tank 1 and the rest outside the system. It is branched to the pipe 14B for discharging to. 16
Is a pipe for supplying the neutralizing agent to the reaction tank 1, and 17 is a pipe for supplying the aggregating agent to the aggregating tank 2.
【００１４】図示の方法において、原水であるアルミニ
ウム含有水は、配管１１より反応槽１に導入され、反応
槽１内にて沈殿槽４から配管１４Ａを経て返送された汚
泥の一部が添加されると共に、配管１６より中和剤が添
加され、ｐＨ５．８〜７．２に調整される。In the illustrated method, the aluminum-containing water which is the raw water is introduced into the reaction tank 1 through the pipe 11 and a part of the sludge returned from the settling tank 4 through the pipe 14A in the reaction tank 1 is added. At the same time, a neutralizer is added from the pipe 16 to adjust the pH to 5.8 to 7.2.
【００１５】本発明において、原水中のアルミニウムは
水酸化物フロックを形成していてもよいが、溶解してい
る方が望ましく、原水は酸性であってもアルカリ性であ
っても良い。従って、原水のｐＨに応じて、ＮａＯＨ，
ＫＯＨ，Ｃａ（ＯＨ）2 ，ＣａＯ等のアルカリや、Ｈ2
ＳＯ4 ，ＨＣｌ，ＨＮＯ3 等の酸が中和剤として、反応
槽１内の液のｐＨが５．８〜７．２の範囲となるように
添加される。ここで、反応槽１内の液のｐＨが５．８未
満であると、アルミニウム量が多くなり、また、ｐＨ
７．２を超えるとゲル状沈殿物が多くなり、沈降性、濃
縮性の悪い汚泥が得られるため好ましくない。In the present invention, aluminum in raw water may form hydroxide flocs, but it is preferable that aluminum is dissolved, and the raw water may be acidic or alkaline. Therefore, depending on the pH of the raw water, NaOH,
Alkali such as KOH, Ca (OH) 2 and CaO, and H 2
Acids such as SO 4 , HCl and HNO 3 are added as neutralizing agents so that the pH of the liquid in the reaction tank 1 is in the range of 5.8 to 7.2. Here, when the pH of the liquid in the reaction tank 1 is less than 5.8, the amount of aluminum increases, and
If it exceeds 7.2, gelled precipitates increase, and sludge having poor sedimentation and concentration properties is obtained, which is not preferable.
【００１６】また、沈殿槽４から返送される返送汚泥量
は多い程好ましく、本発明においては、反応槽内の液中
のＳＳ濃度が１００ｇ／lit.以上、より好ましくは２０
０ｇ／lit.以上となるように返送汚泥量を調整する。反
応槽内の液中のＳＳ濃度が１００ｇ／lit.未満である
と、高濃度汚泥は得られない。The larger the amount of sludge returned from the settling tank 4, the more preferable. In the present invention, the SS concentration in the liquid in the reaction tank is 100 g / lit. Or more, more preferably 20.
Adjust the amount of sludge to be returned to 0 g / lit. Or more. If the SS concentration in the liquid in the reaction tank is less than 100 g / lit., High-concentration sludge cannot be obtained.
【００１７】通常の場合、返送汚泥量は原水流量の０．
５倍以上、特に１倍以上とすることにより、反応槽内の
液中のＳＳ濃度を１００ｇ／lit.以上に調整することが
可能とされる。In the normal case, the amount of sludge to be returned is 0.
By making it 5 times or more, particularly 1 time or more, it is possible to adjust the SS concentration in the liquid in the reaction tank to 100 g / lit.
【００１８】本発明においては、この反応槽１の容量
は、反応槽１内に流入する液の、反応槽内の滞留時間が
１０分以上となるように流入原水量及び返送汚泥量に応
じて適宜選定する。この反応槽滞留時間が１０分未満、
例えば６分程度であると、汚泥を返送することによる本
発明の効果が十分に得られない。これは、液中の未反応
のアルミニウムイオンが反応槽から流出し、沈殿槽内で
水酸化アルミニウムを生成するためと推定される。In the present invention, the capacity of the reaction tank 1 is adjusted according to the amount of raw water flowing in and the amount of sludge to be returned so that the liquid flowing into the reaction tank 1 has a residence time of 10 minutes or more in the reaction tank. Select as appropriate. This reaction tank residence time is less than 10 minutes,
For example, if it is about 6 minutes, the effect of the present invention by returning sludge cannot be sufficiently obtained. It is presumed that this is because unreacted aluminum ions in the liquid flow out of the reaction tank and produce aluminum hydroxide in the precipitation tank.
【００１９】本実施例の方法においては、反応槽１内の
液は、次いで、配管１２より凝集槽２に送給され、凝集
槽２内で配管１７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 liquid in the reaction tank 1 is then fed to the flocculation tank 2 through the pipe 12, and the flocculant is added in the flocculation tank 2 through the pipe 17 for coagulation treatment. .. The aggregating agent used here 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.
【００２０】凝集槽２内で凝集処理された液は、更に、
凝集槽３に送給されて十分に凝集処理された後、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、その一部が配管１４Ａより反応槽１に返送され、残
部は配管１４Ｂより系外に排出され、脱水、乾燥処理さ
れた後、アルミニウム回収工程等に供給される。The liquid coagulated in the coagulation tank 2 is further
After being fed to the aggregating tank 3 and sufficiently agglomerated, it flows into the sedimentation tank 4 for concentration and sedimentation. Then, settling tank 4
The supernatant water 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 partially returned to the reaction tank 1 through the pipe 14A, and the rest is discharged from the system through the pipe 14B, dehydrated, and dried. , Aluminum recovery process, etc.
【００２１】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.
【００２２】例えば、凝集槽は必ずしも必要とされず、
反応槽内の液は直接沈殿槽に供給しても良い。しかしな
がら、凝集槽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、汚泥の沈殿性や処理
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, a flocculation tank is not always necessary,
The liquid in the reaction tank may be directly supplied to the precipitation tank. However, by providing a coagulation tank, adding a coagulant to perform coagulation treatment, and then performing a precipitation treatment, the sedimentation property of sludge and the clarification property of treated water are improved, which is extremely effective for the present invention.
【００２３】また、沈殿槽は清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
槽の替りに膜分離装置、例えば、ＭＦ（精密濾過）、Ｕ
Ｆ（限外濾過）膜分離装置を用いても良い。Since the settling tank is intended for separating clear water and concentrating sludge, in the present invention, instead of the settling tank, a membrane separation device such as MF (microfiltration) or U is used.
An F (ultrafiltration) membrane separator may be used.
【００２４】本発明の方法は、浄水場の原水や懸濁固形
物を含む排水に硫酸バントや塩化アルミニウムを添加し
て凝集処理する場合にも適用可能である。The method of the present invention can also be applied to the case where the raw water of a water purification plant or waste water containing suspended solids is added with vantosulfate or aluminum chloride for coagulation treatment.
【００２５】[0025]
【作用】本発明の方法は、アルミニウム含有水の凝集分
離処理において、分離された汚泥の一部を種晶として反
応槽に返送する方法であり、その際の反応槽ｐＨ、ＳＳ
濃度及び反応槽滞留時間を特定することにより、著しく
高濃度で、沈降性、濃縮性及び脱水性に優れた汚泥を得
るものである。The method of the present invention is a method of returning a part of the separated sludge to the reaction tank as seed crystals in the coagulation separation treatment of aluminum-containing water.
By specifying the concentration and the residence time in the reaction tank, it is possible to obtain sludge having a remarkably high concentration and excellent sedimentation, concentration and dehydration properties.
【００２６】即ち、本発明においては返送汚泥を核とし
て、反応槽内で生成する水酸化アルミニウムをその表面
に析出させることにより、改質造粒する。これにより、
良好な汚泥が得られるのであるが、この汚泥の改質は、
反応槽ｐＨが５．８〜７．２、ＳＳ濃度が１００ｇ／li
t.以上、滞留時間が１０分以上のすべての条件を満たす
ときに、効果的に進行し、これらの条件のうち１つが欠
けても十分な効果は得られない。That is, in the present invention, the reformed granulation is carried out by depositing aluminum hydroxide produced in the reaction tank on the surface of the returned sludge as a nucleus. This allows
Although good sludge can be obtained, the modification of this sludge is
Reaction tank pH is 5.8-7.2, SS concentration is 100g / li
When all the conditions of t. or more and the residence time of 10 minutes or more are satisfied, the process proceeds effectively, and even if one of these conditions is lacking, a sufficient effect cannot be obtained.
【００２７】因みに、本発明の方法によれば、原水のア
ルミニウム濃度に殆ど係りなく、３００ｇ／lit.以上の
高濃度汚泥が得られる。By the way, according to the method of the present invention, a high-concentration sludge of 300 g / lit. Or more can be obtained regardless of the aluminum concentration of raw water.
【００２８】なお、本発明の方法においては、原水中の
アルミニウム濃度が著しく低いないし不検出の場合であ
っても、凝集剤として適当なアルミニウム塩を添加する
ことにより、容易に改質造粒汚泥を得ることができる。In the method of the present invention, even if the aluminum concentration in the raw water is extremely low or undetected, the modified granulation sludge can be easily added by adding an appropriate aluminum salt as a coagulant. Can be obtained.
【００２９】[0029]
【実施例】以下に実施例を挙げて、本発明をより具体的
に説明する。EXAMPLES The present invention will be described in more detail with reference to the following examples.
【００３０】実施例１ 厚木市水に硫酸バンドを表１，２に示すＡｌ濃度となる
ように添加、溶解して得られた原水を、反応槽（容量は
表１，２に示す通り）で凝集処理した後、沈殿槽（内径
１５０ｍｍ）に送給して固液分離処理した。なお、原水
の流量及び沈殿槽からの返送汚泥量（原水流量の１〜１
０倍）は表１，２に示す通りとし、反応槽においては酸
又はアルカリを添加して、表１，２に示すｐＨ値に調整
した。反応槽滞留時間、反応槽ＳＳ濃度は表１，２に示
す通りであった。なお、反応槽滞留時間は、原水と返送
汚泥との総量に対する滞留時間で表示してある。Example 1 Raw water obtained by adding and dissolving a sulfuric acid band to Atsugi city water so as to have an Al concentration shown in Tables 1 and 2 was placed in a reaction tank (capacity is as shown in Tables 1 and 2). After the coagulation treatment, the mixture was fed to a sedimentation tank (inner diameter 150 mm) for solid-liquid separation treatment. The flow rate of raw water and the amount of sludge returned from the settling tank (1 to 1 of the raw water flow rate)
0 times) was as shown in Tables 1 and 2, and acid or alkali was added in the reaction tank to adjust the pH values shown in Tables 1 and 2. The reaction tank residence time and the reaction tank SS concentration were as shown in Tables 1 and 2. The residence time in the reaction tank is indicated by the residence time with respect to the total amount of raw water and returned sludge.
【００３１】このような処理により、反応槽出口液を３
０分静置して得られる濃縮汚泥について全固形物（Ｓ
Ｓ）濃度を分析し、結果を表１，２に示した。By such treatment, the reaction tank outlet liquid is
Concentrated sludge obtained by standing for 0 minutes
S) The concentration was analyzed, and the results are shown in Tables 1 and 2.
【００３２】表１，２より次のことが明らかである。即
ち、反応槽ｐＨを変え、他の条件は同一としたNo. １〜
５の結果から、反応槽ｐＨは５．８〜７．２とすること
により、高濃度汚泥が得られることが明らかである。ま
た、反応槽容量を変えることにより、反応槽滞留時間を
変え、他の条件は同一としたNo. ６〜９の結果から、滞
留時間は１０分以上とすることにより、高濃度汚泥が得
られることが明らかである。更に、反応槽ｐＨ、反応槽
滞留時間を同一ないしほぼ同一とし、反応槽ＳＳ濃度を
変えたNo. １０〜１５の結果から、反応槽ＳＳ濃度を１
００ｇ／lit.以上とすることにより、高濃度汚泥が得ら
れることが明らかである。なお、原水のＡｌ濃度のみを
変えたNo. １６、１７の結果からは、Ａｌ負荷による影
響は殆どないことが明らかである。From Tables 1 and 2, the following is clear. That is, the reaction tank pH was changed and the other conditions were the same.
From the results of No. 5, it is clear that high-concentration sludge can be obtained by setting the reaction tank pH to 5.8 to 7.2. Also, from the results of Nos. 6 to 9 in which the reaction tank retention time was changed by changing the reaction tank capacity and the other conditions were the same, a high-concentration sludge was obtained by setting the retention time to 10 minutes or more. It is clear. Further, from the results of Nos. 10 to 15 in which the reaction tank pH and the reaction tank residence time were the same or almost the same and the reaction tank SS concentration was changed, the reaction tank SS concentration was 1
It is clear that a high-concentration sludge can be obtained by setting it to be not less than 00 g / lit. From the results of Nos. 16 and 17 in which only the Al concentration of the raw water was changed, it is clear that the Al load had almost no effect.
【００３３】一方、No. １８の結果から、汚泥の返送を
行なわないと、高濃度汚泥は得られないことが明らかで
ある。On the other hand, it is clear from the result of No. 18 that high concentration sludge cannot be obtained unless the sludge is returned.
【００３４】[0034]
【表１】 [Table 1]
【００３５】[0035]
【表２】 [Table 2]
【００３６】[0036]
【発明の効果】以上詳述した通り、本発明のアルミニウ
ムの不溶化方法によれば、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。このため、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。As described above in detail, according to the method for insolubilizing aluminum of the present invention, sludge having a high concentration and having an excellent settling property, concentrating property and dewatering property can be obtained. Therefore, 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.
【図１】本発明のアルミニウムの不溶化方法の一実施方
法を示す系統図である。FIG. 1 is a system diagram showing an implementation method of an aluminum insolubilization method of the present invention.
１ 反応槽 ２，３ 凝集槽 ４ 沈殿槽 1 Reaction tank 2, 3 Aggregation tank 4 Precipitation tank
Claims (1)
反応させた後、固液分離処理し、分離した不溶化物の一
部を反応槽に返送する方法において、 反応槽のｐＨを５．８〜７．２に調整し、かつ、反応槽
内の固形物濃度が１００ｇ／lit.以上となるように前記
分離した不溶化物を返送するとともに、反応槽に流入す
る液の反応槽滞留時間を１０分以上とすることを特徴と
するアルミニウムの不溶化方法。1. A method of insolubilizing aluminum-containing water in a reaction tank, subjecting it to a solid-liquid separation treatment, and returning a part of the separated insoluble matter to the reaction tank, wherein the pH of the reaction tank is 5.8 to It was adjusted to 7.2, and the separated insoluble matter was returned so that the solid concentration in the reaction tank was 100 g / lit. Or more, and the reaction tank residence time of the liquid flowing into the reaction tank was 10 minutes. The method for insolubilizing aluminum is characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24340791A JP3420777B2 (en) | 1991-09-24 | 1991-09-24 | Aluminum insolubilization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24340791A JP3420777B2 (en) | 1991-09-24 | 1991-09-24 | Aluminum insolubilization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0576875A true JPH0576875A (en) | 1993-03-30 |
| JP3420777B2 JP3420777B2 (en) | 2003-06-30 |
Family
ID=17103404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24340791A Expired - Lifetime JP3420777B2 (en) | 1991-09-24 | 1991-09-24 | Aluminum insolubilization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3420777B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008105521A1 (en) * | 2007-02-28 | 2008-09-04 | Nippon Poly-Glu Co., Ltd. | Magnetic flocculating agent, method for production thereof, and method for purification of water using magnetic flocculating agent |
| JP2016030250A (en) * | 2014-07-30 | 2016-03-07 | 三菱重工業株式会社 | Wastewater treatment system, and wastewater treatment method using the same |
-
1991
- 1991-09-24 JP JP24340791A patent/JP3420777B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008105521A1 (en) * | 2007-02-28 | 2008-09-04 | Nippon Poly-Glu Co., Ltd. | Magnetic flocculating agent, method for production thereof, and method for purification of water using magnetic flocculating agent |
| JPWO2008105521A1 (en) * | 2007-02-28 | 2010-06-03 | 日本ポリグル株式会社 | Magnetic flocculant, method for producing the same, and water purification method using magnetic flocculant |
| JP2016030250A (en) * | 2014-07-30 | 2016-03-07 | 三菱重工業株式会社 | Wastewater treatment system, and wastewater treatment method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3420777B2 (en) | 2003-06-30 |
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