JPH08323368A - Treatment of lead-containing waste water - Google Patents
Treatment of lead-containing waste waterInfo
- Publication number
- JPH08323368A JPH08323368A JP13534695A JP13534695A JPH08323368A JP H08323368 A JPH08323368 A JP H08323368A JP 13534695 A JP13534695 A JP 13534695A JP 13534695 A JP13534695 A JP 13534695A JP H08323368 A JPH08323368 A JP H08323368A
- Authority
- JP
- Japan
- Prior art keywords
- lead
- waste water
- wastewater
- ferric
- hydroxide
- 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
- 239000002351 wastewater Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 229960004887 ferric hydroxide Drugs 0.000 claims abstract description 12
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims abstract description 12
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001447 ferric ion Inorganic materials 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 8
- 229910021514 lead(II) hydroxide Inorganic materials 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims abstract description 8
- 238000000975 co-precipitation Methods 0.000 claims abstract description 7
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000007788 liquid Substances 0.000 claims description 8
- VNZYIVBHUDKWEO-UHFFFAOYSA-L lead(ii) hydroxide Chemical compound [OH-].[OH-].[Pb+2] VNZYIVBHUDKWEO-UHFFFAOYSA-L 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 229910001868 water Inorganic materials 0.000 description 15
- 238000005345 coagulation Methods 0.000 description 8
- 230000015271 coagulation Effects 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000000638 solvent extraction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- -1 for example Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000004454 trace mineral analysis Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鉛含有排水、例えば金
属表面処理工場、プリント基板製造工場、電子部品製造
工場、電池製造工場等から排出される鉛含有排水の処理
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating lead-containing wastewater, for example, lead-containing wastewater discharged from a metal surface treatment factory, a printed board manufacturing factory, an electronic component manufacturing factory, a battery manufacturing factory and the like.
【０００２】[0002]
【従来の技術】従来、鉛含有排水を処理する方法とし
て、鉛含有排水に水酸化ナトリウム又は水酸化カルシウ
ム等のアルカリ剤を加えて排水中の鉛イオンを不溶化さ
せた後、固液分離して排水中から鉛を除去する方法が知
られている。2. Description of the Related Art Conventionally, as a method for treating lead-containing wastewater, an alkaline agent such as sodium hydroxide or calcium hydroxide is added to lead-containing wastewater to insolubilize lead ions in the wastewater, and then solid-liquid separation is performed. A method of removing lead from wastewater is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記し
た従来の凝集分離法による１段処理法では排水中の鉛濃
度を０．１mg／リットル以下に低減することは困難であ
った。一方、鉛及びその化合物の排水基準は、平成６年
２月１日より従来の基準である排水中の鉛濃度１mg／リ
ットル以下から鉛濃度０．１mg／リットル以下に改正さ
れた。この新排水基準の鉛０．１mg／リットル以下に対
応するためには、従来の凝集分離法で処理した排水に対
して、更に例えば重金属キレート樹脂塔に通して、排水
を２段処理する方法が必要となる。しかしながら、この
方法は設備コストが高く、又重金属キレート樹脂塔の再
生剤として硝酸を使用するため、特に窒素排出規制の厳
しい地域ではその再生廃液を別に処理にしなければなら
ないという欠点があった。However, it has been difficult to reduce the lead concentration in the waste water to 0.1 mg / liter or less by the above-described conventional one-step treatment method by the coagulation separation method. On the other hand, from February 1, 1994, the wastewater standard for lead and its compounds was revised from the conventional standard of lead concentration in wastewater of 1 mg / liter or less to 0.1 mg / liter or less. In order to meet this new wastewater standard of 0.1 mg / liter or less of lead, a method of treating wastewater in two stages by passing it through, for example, a heavy metal chelate resin tower against the wastewater treated by the conventional coagulation separation method Will be needed. However, this method has a drawback in that the facility cost is high and nitric acid is used as a regenerant for the heavy metal chelate resin tower, so that the regenerated waste liquid must be treated separately, especially in areas where nitrogen emission regulations are strict.
【０００４】本発明は前記した従来の鉛含有排水の処理
法の問題を解消し、鉛含有排水中の鉛を従来法に比較し
て、低濃度まで１段処理で除去することができ、更に設
備コストを安くすることができ、そして鉛及びその化合
物の新排水基準である０．１mg／リットル以下の濃度ま
で処理できる鉛含有排水の処理方法を提供することにあ
る。The present invention solves the above-mentioned problems of the conventional method for treating lead-containing wastewater, and allows lead in wastewater containing lead to be removed by one-step treatment to a lower concentration than in the conventional method. It is an object of the present invention to provide a method for treating lead-containing wastewater which can reduce the equipment cost and can treat lead and its compounds to a concentration of 0.1 mg / liter or less, which is a new wastewater standard.
【０００５】[0005]
【課題を解決するための手段】本発明に従えば、前記課
題は、反応槽中において鉛含有排水に第２鉄イオン及び
アルカリ剤を添加し、アルカリ剤で排水のpHを７以上と
して排水中の鉛イオンを水酸化鉛の形で又、第２鉄イオ
ンを水酸化第２鉄の形で不溶化させて固液分離すると共
に、生成した濃縮汚泥の一部を反応槽へ返送して汚泥循
還することによって生成水酸化第２鉄濃度を濃縮すると
共に、その生成水酸化第２鉄の共沈効果により、鉛含有
排水からの鉛の除去効率を高めることによって、解決さ
れる。According to the present invention, the above-mentioned problems are solved by adding ferric ion and an alkaline agent to lead-containing wastewater in a reaction tank and adjusting the pH of the wastewater to 7 or more with the alkaline agent. Lead ions in the form of lead hydroxide and ferric ions in the form of ferric hydroxide for solid-liquid separation, and a portion of the concentrated sludge produced is returned to the reaction tank to circulate the sludge. This is solved by concentrating the produced ferric hydroxide concentration by returning it and increasing the removal efficiency of lead from the lead-containing wastewater by the coprecipitation effect of the produced ferric hydroxide.
【０００６】本発明に従えば、適当な反応槽中に、処理
すべき鉛含有排水を連続又は間欠的に導入し、これに塩
化第二鉄、硫酸第二鉄などの第２鉄イオン及び水酸化カ
ルシウム、水酸化ナトリウムなどのアルカリ剤を添加し
て液のpHを７以上に調整する。この際、生成した水酸化
第二鉄と生成した水酸化鉛との共沈効果を利用する。本
発明において使用する第２鉄イオンの使用量には特に限
定はないが、好ましくは原排水中の鉛濃度に対して０．
２倍量〜０．４倍量（重量比）である。この使用量が少
ないと、共沈効果による鉛処理効率の増大効果が期待で
きないおそれがあり、逆に多過ぎると第２鉄イオンの薬
品使用量が増大するので実用的でない。According to the present invention, the lead-containing wastewater to be treated is continuously or intermittently introduced into a suitable reaction tank, and ferric chloride such as ferric chloride or ferric sulfate and water are introduced into the wastewater. Adjust the pH of the solution to 7 or higher by adding an alkaline agent such as calcium oxide or sodium hydroxide. At this time, the coprecipitation effect of the generated ferric hydroxide and the generated lead hydroxide is used. The amount of ferric ion used in the present invention is not particularly limited, but is preferably 0.
The amount is 2-fold to 0.4-fold (weight ratio). If the amount used is small, the effect of increasing the lead treatment efficiency due to the coprecipitation effect may not be expected, and conversely, if it is too large, the amount of the ferric ion used increases, which is not practical.
【０００７】本発明に従えば、処理すべき鉛含有排水に
適当量の第２鉄イオン及びアルカリ剤を添加して液のpH
を７以上、好ましくは９〜１２、更に好ましくは１０〜
１１に調整して、排水中の鉛イオンを水酸化鉛として、
また第２鉄イオンを水酸化第２鉄として沈殿させる。鉛
は両性金属であるため、水酸化鉛の溶解度はpH１０．５
が最小であり、そのpHより高くても、また低くても水酸
化鉛の溶解度は増大する。しかしながら、本発明に従え
ば、処理pHが中性付近でも共沈効果により排水中の鉛濃
度０．１mg／リットル以下まで鉛を除去することができ
る。According to the present invention, a suitable amount of ferric ion and an alkaline agent are added to the lead-containing wastewater to be treated to adjust the pH of the solution.
Is 7 or more, preferably 9 to 12, and more preferably 10
Adjusted to 11, lead ions in the wastewater as lead hydroxide,
Also, ferric ions are precipitated as ferric hydroxide. Since lead is an amphoteric metal, the solubility of lead hydroxide is pH 10.5.
, And the solubility of lead hydroxide increases above and below its pH. However, according to the present invention, lead can be removed to a lead concentration of 0.1 mg / liter or less in wastewater by the coprecipitation effect even when the treatment pH is near neutral.
【０００８】本発明に従えば、沈澱した水酸化第２鉄及
び水酸化鉛を含む固形分は、例えば沈降槽で通常の方法
を用いて固液分離することができ、例えばクラリファイ
ヤーやシックナーなどを用いることができる。According to the present invention, the precipitated solids containing ferric hydroxide and lead hydroxide can be subjected to solid-liquid separation using a conventional method, for example, in a sedimentation tank, for example, a clarifier or thickener. Can be used.
【０００９】このようにして凝集処理して生成した濃縮
汚泥は、例えばクラリファイヤー又はシックナーなどを
用いて固液分離すると共にその一部を反応槽へ返送して
反応槽でのＳＳ（懸濁物質）濃度が１０００mg／リット
ル以上、好ましくは３０００mg／リットル以上になるよ
うにする。このように、本発明に従って濃縮汚泥の一部
を反応槽へ返送することにより、その共沈効果によって
一つの沈降槽での鉛の除去率が大幅に増大し、処理水中
の鉛濃度を０．１mg／リットル以下まで低減することが
できる。The concentrated sludge produced by the coagulation treatment in this manner is subjected to solid-liquid separation using, for example, a clarifier or thickener, and a part of it is returned to the reaction tank and SS (suspended substance) in the reaction tank is returned. ) The concentration is adjusted to 1000 mg / liter or more, preferably 3000 mg / liter or more. Thus, by returning a part of the concentrated sludge to the reaction tank according to the present invention, the coprecipitation effect significantly increases the lead removal rate in one settling tank, and the lead concentration in the treated water is reduced to 0. It can be reduced to 1 mg / liter or less.
【００１０】[0010]
【実施例】以下、実施例に従って、本発明を更に詳しく
説明するが、本発明の範囲をこれらの実施例に限定する
ものでないことはいうまでもない。EXAMPLES The present invention will be described in more detail below with reference to Examples, but it goes without saying that the scope of the present invention is not limited to these Examples.
【００１１】例１（実施例） 処理対象排水として、電子部品製造工場から排出される
鉛含量７．５０mg／リットルの鉛含有排水を用いた。反
応槽に市水２００mlを入れ、これにＦｅＣｌ3 ４５６０
mg／リットル〔Ｆｅ（ＯＨ）3 として３０００mg／リッ
トル相当〕を添加し、更に５％Ｃａ（ＯＨ） 2 にて液の
pHを１０とし、常温で１０分間攪拌後、これをＦＫフロ
ック−Ｄ（富士化水工業（株）製強アニオン系高分子凝
集剤）にて凝集処理した。次に、上記凝集処理の濃縮汚
泥８０ml全量を前記処理対象水２００ml（Ｐｂ濃度７．
５０mg／リットル）に投入し、これにＦｅＣｌ3 ７０mg
／リットルを添加し、更に５％Ｃａ（ＯＨ）2 にて液の
pHを１０とし、常温で１０分攪拌後、ＦＫフロック−Ｄ
にて凝集処理した。得られた処理水の鉛含量は原子吸光
直接法で０．１mg／リットル以下（検出限界値以下）で
あった。なお、鉛の微量分析において、原子吸光直接法
では塩濃度の影響を受けて高めの数値となるため、塩濃
度の影響を受けない溶媒抽出法で分析したところ、得ら
れた処理水の鉛含量は溶媒抽出法では０．０１mg／リッ
トル以下であった。[0011]Example 1 (Example) Wastewater to be treated is discharged from the electronic parts manufacturing plant
A lead-containing wastewater having a lead content of 7.50 mg / liter was used. Anti
Put 200 ml of city water into the reaction tank and add FeCl to it.34560
mg / liter [Fe (OH)3As 3000mg / lit
Equivalent to torr] is added, and further 5% Ca (OH) 2At the liquid
Adjust the pH to 10 and stir at room temperature for 10 minutes.
CK-D (manufactured by Fuji Kasui Co., Ltd.)
Aggregation treatment was performed with a collecting agent. Next, the concentrated fouling of the above coagulation treatment
The whole amount of 80 ml of mud is 200 ml of the water to be treated (Pb concentration 7.
50 mg / liter) and add FeCl370 mg
/ L is added, and further 5% Ca (OH)2At the liquid
After adjusting the pH to 10 and stirring at room temperature for 10 minutes, FK Flock-D
Was subjected to coagulation treatment. The lead content of the obtained treated water is atomic absorption
0.1 mg / liter or less by direct method (below detection limit)
there were. Atomic absorption direct method for lead trace analysis
In the case of salt concentration, the value will be higher due to the influence of salt concentration.
When the solvent extraction method that is not affected by the
The lead content of the treated water is 0.01 mg / litre by the solvent extraction method.
It was below torr.
【００１２】例２（実施例） 純水にＰｂ（ＮＯ3 ）2 １１０mg／リットル（Ｐｂ濃度
８５mg／リットル）を溶解した液を処理対象水とした。
この処理対象水中の鉛含量は８４．５mg／リットルであ
った。反応槽に市水２００mlを入れ、これにＦｅＣｌ3
４５６０mg／リットル〔Ｆｅ（ＯＨ）3 として３０００
mg／リットル相当〕を添加し、更に５％Ｃａ（ＯＨ） 2
にて液のpHを７とし、常温で１０分間攪拌後、これをＦ
Ｋフロック−Ｄにて凝集処理した。[0012]Example 2 (Example) Pb (NO3)2110 mg / liter (Pb concentration
The solution in which 85 mg / liter) was dissolved was treated water.
The lead content in this treated water is 84.5 mg / liter
It was. Put 200 ml of city water into the reaction tank and add FeCl to it.3
4560 mg / liter [Fe (OH)3As 3000
[mg / liter equivalent] is added, and further 5% Ca (OH) 2
Adjust the pH of the solution to 7 and stir at room temperature for 10 minutes, then add F
Aggregation treatment was performed with K-Floc-D.
【００１３】次に、上記凝集処理の濃縮汚泥８０ml全量
を前記処理対象水２００ml（Ｐｂ濃度８４．５mg／リッ
トル）に投入し、これにＦｅＣｌ3 ７０mg／リットルを
添加し、更に５％Ｃａ（ＯＨ）2 にて液のpHを７とし、
常温で１０分攪拌後、ＦＫフロック−Ｄにて凝集処理し
た。得られた処理水の鉛含量は原子吸光直接法で０．１
mg／リットル以下であり、溶媒抽出法では０．０１５mg
／リットルであった。Next, 80 ml of the concentrated sludge obtained by the coagulation treatment was put into 200 ml of the water to be treated (Pb concentration 84.5 mg / liter), and 70 mg / liter of FeCl 3 was added thereto, and further 5% Ca (OH) was added. ) Set the pH of the solution to 7 with 2 .
After stirring at room temperature for 10 minutes, flocculation treatment was performed with FK Floc-D. The lead content of the obtained treated water is 0.1 by the atomic absorption direct method.
mg / l or less, 0.015 mg by solvent extraction method
/ Liter.
【００１４】例３（比較例） 例２の比較例として従来法の凝集処理を行なった。純水
にＰｂ（ＮＯ3 ）2 １１０mg／リットル（Ｐｂ濃度８５
mg／リットル）を溶解した液を処理対象水とした。この
処理対象水２００ml（Ｐｂ濃度８４．５mg／リットル）
に対してＦｅＣｌ3 無添加、ＦｅＣｌ3 ５０mg／リット
ル添加、ＦｅＣｌ3 １００mg／リットル添加し、それぞ
れ５％Ｃａ（ＯＨ）2 にてpH７とし、１０分攪拌後、Ｆ
Ｋフロック−Ｄにて凝集処理し、各処理水中の鉛含量を
原子吸光直接法で分析した。結果を表Ｉに示した。 Example 3 (Comparative Example) As a comparative example of Example 2, a conventional aggregation treatment was performed. Pb (NO 3 ) 2 110 mg / liter in pure water (Pb concentration 85
The solution in which (mg / liter) was dissolved was used as the water to be treated. This treated water 200 ml (Pb concentration 84.5 mg / liter)
FeCl 3 was not added, FeCl 3 was added at 50 mg / liter, FeCl 3 was added at 100 mg / liter, and each was adjusted to pH 7 with 5% Ca (OH) 2 and stirred for 10 minutes.
After coagulation with K-Floc-D, the lead content in each treated water was analyzed by an atomic absorption direct method. The results are shown in Table I.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明によれば、以上説明したように、
鉛含有排水中の鉛含量を従来の凝集処理に比べて、低濃
度まで除去することができ、更に、従来は鉛の高度処理
は２段処理を行なうことが一般的であったが、本発明に
よれば、鉛含有排水の１段での安定処理が可能となる。According to the present invention, as described above,
The lead content in the lead-containing wastewater can be removed to a lower concentration as compared with the conventional coagulation treatment, and in the past, it was general that the advanced treatment of lead was performed in two stages. According to the method, the lead-containing wastewater can be stably treated in one stage.
Claims (1)
オンを添加し、アルカリ剤で排水のpHを７以上として排
水中の鉛イオンを水酸化鉛の形で、また第２鉄イオンを
水酸化第２鉄の形で不溶化させて固液分離すると共に、
生成した濃縮汚泥の一部を反応槽へ返送して汚泥循還す
ることによって生成水酸化第２鉄濃度を濃縮すると共
に、その生成水酸化第２鉄の共沈効果により、鉛含有排
水からの鉛の除去効率を高めることを特徴とする鉛含有
排水の処理方法。1. A ferric ion is added to a lead-containing wastewater in a reaction tank, the pH of the wastewater is adjusted to 7 or more with an alkaline agent, and the lead ion in the wastewater is in the form of lead hydroxide. While insolubilizing it in the form of ferric hydroxide for solid-liquid separation,
By returning a part of the produced concentrated sludge to the reaction tank and circulating the sludge, the concentration of ferric hydroxide produced is concentrated, and due to the coprecipitation effect of the produced ferric hydroxide, it is possible to remove it from the wastewater containing lead. A method for treating lead-containing wastewater, which is characterized by increasing the efficiency of removing lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13534695A JPH08323368A (en) | 1995-06-01 | 1995-06-01 | Treatment of lead-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13534695A JPH08323368A (en) | 1995-06-01 | 1995-06-01 | Treatment of lead-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08323368A true JPH08323368A (en) | 1996-12-10 |
Family
ID=15149629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13534695A Pending JPH08323368A (en) | 1995-06-01 | 1995-06-01 | Treatment of lead-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08323368A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
-
1995
- 1995-06-01 JP JP13534695A patent/JPH08323368A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
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