JP5158520B2 - Treatment method for wastewater containing heavy metals - Google Patents
Treatment method for wastewater containing heavy metals Download PDFInfo
- Publication number
- JP5158520B2 JP5158520B2 JP2009069924A JP2009069924A JP5158520B2 JP 5158520 B2 JP5158520 B2 JP 5158520B2 JP 2009069924 A JP2009069924 A JP 2009069924A JP 2009069924 A JP2009069924 A JP 2009069924A JP 5158520 B2 JP5158520 B2 JP 5158520B2
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen phosphate
- calcium hydrogen
- heavy metal
- phosphate dihydrate
- dihydrate
- 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
Images
Landscapes
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
本発明は重金属含有排水の処理方法に関し、更に詳しくは鉛やカドミウム等の重金属を含有する排水からそれらを安全且つ簡便な手段で経済的且つ効率的に除去することができる重金属含有排水の処理方法に関する。 TECHNICAL FIELD The present invention relates to a method for treating heavy metal-containing wastewater, and more particularly, a method for treating heavy metal-containing wastewater that can be removed economically and efficiently from wastewater containing heavy metals such as lead and cadmium by a safe and simple means. About.
従来、重金属含有排水の処理方法としては、キノリン化合物、アミノベンゼン化合物、ジオキシム化合物、ポリアミン化合物等、有機化合物系の重金属固定化剤乃至不溶化剤を用いる方法が知られている（例えば特許文献１〜３参照）。しかし、これらの従来法には、有機化合物を用いるため、二次公害を引き起こすおそれがあり、概して処理操作が厄介で費用も嵩むという問題がある。重金属含有排水の処理方法としては、いずれもｐＨ調整下で、酸化剤、ケイ酸化合物、マンガン化合物、硫化剤等、無機化合物系の沈澱形成剤を用いる方法も知られており（例えば特許文献４〜７参照）、また塩化カルシウムや水酸化カルシウムのようなカルシウム化合物、塩化第１鉄や硝酸第１鉄のような２価鉄塩等、無機化合物系の凝集剤を用いる方法も知られている（例えば特許文献８〜１０参照）。しかし、これらの従来法には、使用量の割には重金属の除去が不充分で、概して相当量の沈澱物が生成するため、その処理が厄介という問題がある。 Conventionally, as a method for treating heavy metal-containing wastewater, methods using organic compound-based heavy metal immobilizing agents or insolubilizing agents such as quinoline compounds, aminobenzene compounds, dioxime compounds, and polyamine compounds are known (for example, Patent Documents 1 to 3). 3). However, these conventional methods use organic compounds, which may cause secondary pollution, and generally have a problem that the processing operation is troublesome and expensive. As a method for treating heavy metal-containing wastewater, there is also known a method using an inorganic compound-based precipitation forming agent such as an oxidizing agent, a silicic acid compound, a manganese compound, and a sulfurizing agent under pH adjustment (for example, Patent Document 4). To 7), and methods using inorganic compound-based flocculants such as calcium compounds such as calcium chloride and calcium hydroxide, and divalent iron salts such as ferrous chloride and ferrous nitrate are also known. (For example, refer to Patent Documents 8 to 10). However, these conventional methods have a problem that the removal of heavy metals is insufficient for the amount of use, and a considerable amount of precipitates are generally formed, so that the treatment is troublesome.
本発明が解決しようとする課題は、重金属含有排水から重金属を安全且つ簡便な手段で経済的且つ効率的に除去することができる重金属含有排水の処理方法を提供する処にある。 A problem to be solved by the present invention is to provide a method for treating heavy metal-containing wastewater that can remove heavy metals from heavy metal-containing wastewater economically and efficiently by safe and simple means.
前記の課題を解決する本発明は、重金属含有排水にｐＨ４．０〜１０．０の調整下で下記の活性化リン酸水素カルシウム二水和物を加えて混合し、排水中の重金属を該活性化リン酸水素カルシウム二水和物の粒子表面に吸着させた後、固液分離して、排水中の重金属を除去することを特徴とする重金属含有排水の処理方法に係る。
活性化リン酸水素カルシウム二水和物：リン酸水素カルシウム二水和物を水中で撹拌して、その粒子表面をエッチング処理したもの
The present invention for solving the above-mentioned problems is to add the following activated calcium hydrogen phosphate dihydrate to a heavy metal-containing wastewater under the adjustment of pH 4.0 to 10.0, and mix the resulting mixture with the heavy metal in the wastewater. The present invention relates to a method for treating heavy metal-containing wastewater, characterized in that the heavy metal in the wastewater is removed by solid-liquid separation after adsorbing to the particle surface of calcium hydrogen phosphate dihydrate.
Activated calcium hydrogen phosphate dihydrate: Calcium hydrogen phosphate dihydrate stirred in water and the particle surface etched
本発明では先ず、重金属含有排水を、そのｐＨが４．０〜１０．０の範囲を外れている場合には、ｐＨ４．０〜１０．０に調整する。ｐＨがこの範囲を外れると、そのような重金属含有排水に活性化リン酸水素カルシウム二水和物を加えて混合しても、排水中の重金属を該活性化リン酸水素カルシウム二水和物の粒子表面に充分に吸着させることができない。ｐＨは５．８〜８．６に調整すると、処理後の排水をそのまま放出することができる。かかるｐＨの調整には、排水のｐＨとの関係でそれ自体は公知の各種のアルカリ性剤や酸性剤を使用することができるが、塩化カルシウム、水酸化カルシウム、炭酸カルシウム等のカルシウム化合物を使用するのが有利である。 In the present invention, first, the heavy metal-containing wastewater is adjusted to pH 4.0 to 10.0 when the pH is out of the range of 4.0 to 10.0. When the pH is out of this range, even if activated calcium hydrogen phosphate dihydrate is added to and mixed with such heavy metal-containing wastewater, the heavy metal in the wastewater is mixed with the activated calcium hydrogen phosphate dihydrate. It cannot be sufficiently adsorbed on the particle surface. When the pH is adjusted to 5.8 to 8.6, the treated waste water can be discharged as it is. For adjusting the pH, various alkaline agents and acid agents known per se can be used in relation to the pH of the wastewater, but calcium compounds such as calcium chloride, calcium hydroxide and calcium carbonate are used. Is advantageous.
本発明では次に、重金属含有排水に、前記したようなｐＨ４．０〜１０．０の調整下で、活性化リン酸水素カルシウム二水和物を加えて混合する。活性化リン酸水素カルシウム二水和物はリン酸水素カルシウム二水和物を水中で撹拌してその粒子表面をエッチング処理することにより活性化したもので、その原料となるリン酸水素カルシウム二水和物としては市販されているものを適宜使用することができる。加える活性化リン酸水素カルシウム二水和物の量は、排水中の重金属濃度等にもよるが、通常は重金属含有排水に対して０．０１〜０．５質量％となる量とする。また混合時間は通常、０．５〜２４時間程度とする。 Next, in the present invention, activated calcium hydrogen phosphate dihydrate is added to and mixed with the heavy metal-containing wastewater under the adjustment of pH 4.0 to 10.0 as described above. Activated calcium hydrogen phosphate dihydrate is activated by stirring calcium hydrogen phosphate dihydrate in water and etching the particle surface. A commercially available product can be used as appropriate. The amount of activated calcium hydrogen phosphate dihydrate to be added depends on the heavy metal concentration in the wastewater, but is usually 0.01 to 0.5% by mass with respect to the heavy metal-containing wastewater. The mixing time is usually about 0.5 to 24 hours.
前記のように活性化リン酸水素カルシウム二水和物を加えて混合すると、排水中の重金属は活性化リン酸水素カルシウム二水和物の粒子表面に吸着されるので、本発明では最後に、活性化リン酸水素カルシウム二水和物を加えて混合したものを固液分離し、固形分を回収する。固液分離には、それ自体は公知の各種の濾過機や遠心分離機を使用することができる。排水中の重金属は活性化リン酸水素カルシウム二水和物の粒子表面に吸着され、かかる固液分離で固形分として回収されるので、排水から除去される。 When activated calcium hydrogen phosphate dihydrate is added and mixed as described above, the heavy metal in the waste water is adsorbed on the particle surface of the activated calcium hydrogen phosphate dihydrate. The mixture obtained by adding activated calcium hydrogen phosphate dihydrate is separated into solid and liquid, and the solid content is recovered. For solid-liquid separation, various types of known filters and centrifuges can be used. The heavy metal in the waste water is adsorbed on the surface of the activated calcium hydrogen phosphate dihydrate particles, and is recovered as a solid content by such solid-liquid separation, so that it is removed from the waste water.
排水からの重金属の除去程度は、重金属がリン酸水素カルシウム二水和物の粒子表面にどの程度吸着されるかによって異なり、具体的には重金属の種類やリン酸水素カルシウム二水和物の粒子表面の構造等によって異なる。実際のところ、表面が滑らかな柱状結晶構造を呈する市販のリン酸水素カルシウム二水和物をそのまま使用しても、排水からの重金属の除去率は、例えば鉛の場合に９０質量％程度を超えるが、例えばカドミウムの場合には８０質量％程度未満になる。 The degree of heavy metal removal from wastewater depends on how much heavy metal is adsorbed on the surface of calcium hydrogen phosphate dihydrate particles. Specifically, the type of heavy metal and calcium hydrogen phosphate dihydrate particles It depends on the surface structure. In fact, even if a commercially available calcium hydrogen phosphate dihydrate having a smooth columnar crystal structure is used as it is, the removal rate of heavy metals from wastewater exceeds, for example, about 90% by mass in the case of lead. However, in the case of cadmium, for example, it is less than about 80% by mass.
しかし、リン酸水素カルシウム二水和物として、その粒子表面をエッチング処理することにより活性化した活性化リン酸水素カルシウム二水和物を使用すると、排水からの重金属の除去率を著しく高めることができる。実際のところ、その粒子表面をナノメータ（ｎｍ）レベルのエッチング構造とした活性化リン酸水素カルシウム二水和物を使用すると、排水からの重金属の除去率を、鉛の場合も、またカドミウムの場合も、更に銅の場合も、９５〜１００質量％にまですることができる。 However, when activated calcium hydrogen phosphate dihydrate activated by etching the particle surface as calcium hydrogen phosphate dihydrate is used, the removal rate of heavy metals from wastewater can be significantly increased. it can. In fact, using activated calcium hydrogen phosphate dihydrate with a nanometer (nm) level etching structure on the particle surface, the removal rate of heavy metals from wastewater can be reduced in the case of lead and cadmium. Further, in the case of copper, the content can be increased to 95 to 100% by mass.
前記のようなエッチング処理は、リン酸水素カルシウム水和物を水中で撹拌することにより行なうことができるが、リン酸水素カルシウム二水和物の粒子表面をナノメータ（ｎｍ）レベルのエッチング構造とするためには、リン酸水素カルシウム二水和物を水中で撹拌するときの水／リン酸水素カルシウム二水和物の質量比、温度及び時間、なかでも温度に注意し、温度を４０℃以上とするのが好ましく、水／リン酸水素カルシウム二水和物の質量比を３５〜１００、温度を５０〜８０℃及び時間を１〜６０分間とするのがより好ましい。 The etching treatment as described above can be performed by stirring the calcium hydrogen phosphate hydrate in water, but the particle surface of the calcium hydrogen phosphate dihydrate has a nanometer (nm) level etching structure. For this purpose, pay attention to the mass ratio of water / calcium hydrogen phosphate dihydrate, temperature and time, especially temperature when stirring calcium hydrogen phosphate dihydrate in water, and the temperature should be 40 ° C or higher. Preferably, the mass ratio of water / calcium hydrogen phosphate dihydrate is 35 to 100, the temperature is 50 to 80 ° C., and the time is 1 to 60 minutes.
本発明によると、重金属含有排水から重金属を安全且つ簡便な手段で経済的且つ効率的に除去することができる。 According to the present invention, heavy metals can be removed economically and efficiently from heavy metal-containing wastewater by safe and simple means.
試験区分１
硝酸鉛を用いて調製した鉛イオンを５mg／Ｌ、１０mg／Ｌ又は１５mg／Ｌ含有する酸性水溶液２０ｇに、撹拌しながら少量の水酸化カルシウムを加えてｐＨ５．５に調整した後、リン酸水素カルシウム二水和物として市販品Ａ（試薬）又は市販品Ｂ（ゼラチン製造時の副生物）を０．０２ｇ加え、２５℃の温度下で６時間撹拌し、遠心分離して、固形分を回収した。固形分を回収した後の遠心分離液をＩＣＰ発光分光分析に供し、鉛イオンの濃度を求めた。結果を表１及び図１に示した。
Test category 1
After adjusting the pH to 5.5 by adding a small amount of calcium hydroxide with stirring to 20 g of an acidic aqueous solution containing 5 mg / L, 10 mg / L or 15 mg / L of lead ions prepared using lead nitrate, hydrogen phosphate Add 0.02g of commercial product A (reagent) or commercial product B (by-product of gelatin production) as calcium dihydrate, stir at 25 ° C for 6 hours, and centrifuge to recover solids did. The centrifuged liquid after recovering the solid content was subjected to ICP emission spectroscopic analysis to determine the concentration of lead ions. The results are shown in Table 1 and FIG.
硝酸カドミウムを用いて調製したカドミウムイオンを５mg／Ｌ、１０mg／Ｌ又は１５mg／Ｌ含有する酸性水溶液２０ｇに、撹拌しながら少量の水酸化カルシウムを加えてｐＨ５．５に調整した後、リン酸水素カルシウム二水和物として市販品Ａ（試薬）又は市販品Ｂ（ゼラチン製造時の副生物）を０．０２ｇ加え、２５℃の温度下で６時間撹拌し、遠心分離して、固形分を回収した。固形分を回収した後の遠心分離液をＩＣＰ発光分光分析に供し、カドミウムイオンの濃度を求めた。結果を表２及び図１に示した。
After adjusting the pH to 5.5 by adding a small amount of calcium hydroxide with stirring to 20 g of an acidic aqueous solution containing 5 mg / L, 10 mg / L or 15 mg / L of cadmium ions prepared using cadmium nitrate, hydrogen phosphate Add 0.02g of commercial product A (reagent) or commercial product B (by-product of gelatin production) as calcium dihydrate, stir at 25 ° C for 6 hours, and centrifuge to recover solids did. The centrifuged liquid after recovering the solid content was subjected to ICP emission spectroscopic analysis to determine the concentration of cadmium ions. The results are shown in Table 2 and FIG.
図１において、曲線１は市販品Ｂについて鉛イオンの除去率を示し、曲線２は市販品Ａについて鉛イオンの除去率を示し、曲線３は市販品Ｂについてカドミウムイオンの除去率を示し、曲線４は市販品Ａについてカドミウムイオンの除去率を示している。また図３は、市販品Ａのリン酸水素カルシウム二水和物の粒子表面を例示する５０００倍の走査型電子顕微鏡写真である。図示を省略するが、市販品Ｂの粒子表面も市販品Ａとほぼ同様になっている。これらの表１、表２、図１及び図３からも明らかなように、表面が滑らかな柱状結晶構造を呈する市販のリン酸水素カルシウム二水和物をそのまま使用しても、排水から重金属を相応に除去することができ、その除去率は、例えば鉛の場合に９０質量％程度を超えるが、例えばカドミウムの場合には８０質量％程度未満になる。 In FIG. 1, curve 1 shows the removal rate of lead ions for commercial product B, curve 2 shows the removal rate of lead ions for commercial product A, curve 3 shows the removal rate of cadmium ions for commercial product B, and curve 4 shows the removal rate of cadmium ions for the commercial product A. FIG. 3 is a scanning electron micrograph of 5000 times illustrating the particle surface of commercially available product A calcium hydrogen phosphate dihydrate. Although not shown, the particle surface of the commercial product B is almost the same as that of the commercial product A. As is clear from these Tables 1 and 2, FIG. 1 and FIG. 3, even if a commercially available calcium hydrogen phosphate dihydrate having a smooth columnar crystal structure is used as it is, heavy metals can be removed from the wastewater. For example, in the case of lead, the removal rate exceeds about 90% by mass, but in the case of cadmium, for example, it becomes less than about 80% by mass.
試験区分２
硝酸鉛を用いて調製した鉛イオンを５mg／Ｌ、１０mg／Ｌ又は１５mg／Ｌ含有する酸性水溶液２０ｇに、撹拌しながら少量の水酸化カルシウムを加えてｐＨ５．５に調整した後、下記の活性化リン酸水素カルシウム二水和物Ａ又はＢを０．０２ｇ加え、２５℃の温度下で６時間撹拌し、遠心分離して、固形分を回収した。固形分を回収した後の遠心分離液をＩＣＰ発光分光分析に供し、鉛イオンの濃度を求めた。結果を表３及び図２に示した。
活性化リン酸水素カルシウム二水和物Ａ：前記の市販品Ａ（試薬）を、水／市販品Ａの質量比が５０、温度５０℃の水中で６０分間撹拌して、その粒子表面をエッチング処理し、ナノメータ（ｎｍ）レベルのエッチング構造としたもの。
活性化リン酸水素カルシウム二水和物Ｂ：前記の市販品Ｂ（ゼラチン製造時の副生物）を、水／市販品Ｂの質量比が５０、温度５０℃の水中で６０分間撹拌して、その粒子表面をエッチング処理し、ナノメータ（ｎｍ）レベルのエッチング構造としたもの。
Test category 2
After adjusting the pH to 5.5 by adding a small amount of calcium hydroxide while stirring to 20 g of an acidic aqueous solution containing 5 mg / L, 10 mg / L or 15 mg / L of lead ions prepared using lead nitrate, 0.02 g of calcium hydrogen phosphate dihydrate A or B was added, and the mixture was stirred at a temperature of 25 ° C. for 6 hours and centrifuged to recover a solid content. The centrifuged liquid after recovering the solid content was subjected to ICP emission spectroscopic analysis to determine the concentration of lead ions. The results are shown in Table 3 and FIG.
Activated calcium hydrogen phosphate dihydrate A: The above-mentioned commercial product A (reagent) is stirred for 60 minutes in water with a mass ratio of water / commercial product A of 50 and temperature of 50 ° C., and the particle surface is etched. Processed into a nanometer (nm) level etching structure.
Activated calcium hydrogen phosphate dihydrate B: The above-mentioned commercial product B (by-product in the production of gelatin) is stirred for 60 minutes in water at a mass ratio of water / commercial product B of 50, temperature 50 ° C., The particle surface is etched to have a nanometer (nm) level etching structure.
硝酸カドミウムを用いて調製したカドミウムイオンを５mg／Ｌ、１０mg／Ｌ又は１５mg／Ｌ含有する酸性水溶液２０ｇに、撹拌しながら少量の水酸化カルシウムを加えてｐＨ５．５に調整した後、前記の活性化リン酸水素カルシウム二水和物Ａ又はＢを０．０２ｇ加え、２５℃の温度下で６時間撹拌し、遠心分離して、固形分を回収した。固形分を回収した後の遠心分離液をＩＣＰ発光分光分析に供し、カドミウムイオンの濃度を求めた。結果を表４及び図２に示した。 After adjusting the pH to 5.5 by adding a small amount of calcium hydroxide while stirring to 20 g of an acidic aqueous solution containing 5 mg / L, 10 mg / L or 15 mg / L of cadmium ions prepared using cadmium nitrate, 0.02 g of calcium hydrogen phosphate dihydrate A or B was added, and the mixture was stirred at a temperature of 25 ° C. for 6 hours and centrifuged to recover a solid content. The centrifuged liquid after recovering the solid content was subjected to ICP emission spectroscopic analysis to determine the concentration of cadmium ions. The results are shown in Table 4 and FIG.
硫酸銅を用いて調製した銅イオンを５mg／Ｌ、１０mg／Ｌ又は１５mg／Ｌ含有する酸性水溶液２０ｇに、撹拌しながら少量の水酸化カルシウムを加えてｐＨ５．５に調整した後、前記の活性化リン酸水素カルシウム二水和物Ａ又はＢを０．０２ｇ加え、２５℃の温度下で６時間撹拌し、遠心分離して、固形分を回収した。固形分を回収した後の遠心分離液をＩＣＰ発光分光分析に供し、カドミウムイオンの濃度を求めた。結果を表５及び図２に示した。 After adjusting the pH to 5.5 by adding a small amount of calcium hydroxide with stirring to 20 g of an acidic aqueous solution containing 5 mg / L, 10 mg / L or 15 mg / L of copper ions prepared using copper sulfate, the activity described above 0.02 g of calcium hydrogen phosphate dihydrate A or B was added, and the mixture was stirred at a temperature of 25 ° C. for 6 hours and centrifuged to recover a solid content. The centrifuged liquid after recovering the solid content was subjected to ICP emission spectroscopic analysis to determine the concentration of cadmium ions. The results are shown in Table 5 and FIG.
図２において、曲線５は活性化リン酸水素カルシウム二水和物Ｂについて鉛イオンの除去率を示し、曲線６は活性化リン酸水素カルシウム二水和物Ａについて鉛イオンの除去率を示し、曲線７は活性化リン酸水素カルシウム二水和物Ｂについてカドミウムイオンの除去率を示し、曲線８は活性化リン酸水素カルシウム二水和物Ａについてカドミウムイオンの除去率を示し、曲線９は活性化リン酸水素カルシウム二水和物Ｂについて銅イオンの除去率を示し、曲線１０は活性化リン酸水素カルシウム二水和物Ａについて銅イオンの除去率を示している。また図４は活性化リン酸水素カルシウム二水和物Ａの粒子表面を例示する５０００倍の走査型電子顕微鏡写真である。図示を省略するが、活性化リン酸水素カルシウム二水和物Ｂの粒子表面も活性化リン酸水素カルシウム二水和物Ａとほぼ同様になっている。これらの表３〜表５、図２及び図４からも明らかなように、表面が滑らかな柱状結晶構造を呈する市販のリン酸水素カルシウム二水和物をエッチング処理して活性化し、その粒子表面をナノメータ（ｎｍ）レベルのエッチング構造にすると、排水からの重金属の除去率は、例えば鉛の場合も、またカドミウムの場合も、更に銅の場合も、９５〜１００質量％程度にすることができる。
In FIG. 2,
１ リン酸水素カルシウム二水和物の市販品Ｂについて鉛イオンの除去率を示す曲線
２ リン酸水素カルシウム二水和物の市販品Ａについて鉛イオンの除去率を示す曲線
３ リン酸水素カルシウム二水和物の市販品Ｂについてカドミウムイオンの除去率を示す曲線
４ リン酸水素カルシウム二水和物の市販品Ａについてカドミウムイオンの除去率を示す曲線
５ 活性化リン酸水素カルシウム二水和物Ｂについて鉛イオンの除去率を示す曲線
６ 活性化リン酸水素カルシウム二水和物Ａについて鉛イオンの除去率を示す曲線
７ 活性化リン酸水素カルシウム二水和物Ｂについてカドミウムイオンの除去率を示す曲線
８ 活性化リン酸水素カルシウム二水和物Ａについてカドミウムイオンの除去率を示す曲線
９ 活性化リン酸水素カルシウム二水和物Ｂについて銅イオンの除去率を示す曲線
１０ 活性化リン酸水素カルシウム二水和物Ａについて銅イオンの除去率を示す曲線
1 Curve showing lead ion removal rate for commercial product B of calcium hydrogen phosphate dihydrate 2 Curve showing lead ion removal rate for commercial product A of calcium hydrogen phosphate dihydrate 3 Calcium hydrogen phosphate 2 Curve showing removal rate of cadmium ion for commercial product B of hydrate 4 Curve showing removal rate of cadmium ion for commercial product A of calcium
Claims (4)
活性化リン酸水素カルシウム二水和物：リン酸水素カルシウム二水和物を水中で撹拌して、その粒子表面をエッチング処理したもの Adjustment of a pH4.0~10.0 heavy metal-containing waste water by the addition of active potash phosphate dibasic calcium dihydrate below were mixed, heavy metals the activated-phosphate dibasic calcium dihydrate in the wastewater A method for treating heavy metal-containing wastewater, wherein the heavy metal in the wastewater is removed by solid-liquid separation after being adsorbed on the particle surface of the object.
Activated calcium hydrogen phosphate dihydrate: Calcium hydrogen phosphate dihydrate stirred in water and the particle surface etched
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009069924A JP5158520B2 (en) | 2009-03-23 | 2009-03-23 | Treatment method for wastewater containing heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009069924A JP5158520B2 (en) | 2009-03-23 | 2009-03-23 | Treatment method for wastewater containing heavy metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2010221104A JP2010221104A (en) | 2010-10-07 |
| JP5158520B2 true JP5158520B2 (en) | 2013-03-06 |
Family
ID=43038875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009069924A Expired - Fee Related JP5158520B2 (en) | 2009-03-23 | 2009-03-23 | Treatment method for wastewater containing heavy metals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5158520B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08182984A (en) * | 1994-12-28 | 1996-07-16 | Toto Ltd | Removal of heavy metal ion from heavy metal ion-containing water |
| JP2006175315A (en) * | 2004-12-21 | 2006-07-06 | Toyobo Co Ltd | Harmful substance adsorbing and removing material |
-
2009
- 2009-03-23 JP JP2009069924A patent/JP5158520B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010221104A (en) | 2010-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102001734B (en) | Heavy metal settling agent for treating mercury-containing wastewater | |
| TWI626990B (en) | Treatment method and treatment device for radioactive waste water | |
| JP2008184469A (en) | Mixture composition and method for treating heavy metal therewith | |
| JP5831914B2 (en) | Water treatment method | |
| JP5451323B2 (en) | Water treatment method | |
| WO2018168558A1 (en) | Water treatment method, magnesium agent for water treatment, and method for producing magnesium agent for water treatment | |
| JP6242743B2 (en) | Purification treatment agent and purification treatment method | |
| JP2012157834A (en) | Removing agent for harmful substances in wastewater and removal method using the same | |
| JP2007237075A (en) | Treatment method for wastewater containing fluoride ion, and wastewater treatment agent | |
| JP2010082497A (en) | Water treating agent and method for treating water | |
| JP2011156470A (en) | Method for treatment of contaminant components | |
| JP5158520B2 (en) | Treatment method for wastewater containing heavy metals | |
| JP5848119B2 (en) | Treatment method for fluorine-containing wastewater | |
| JP4338705B2 (en) | Method for treating waste liquid containing borofluoride ions | |
| JP2013159822A (en) | Impurity removal method | |
| JP2017159222A (en) | Method for removing arsenic | |
| JP2018130717A (en) | Processing method and system for treatment of desulfurization waste water | |
| TWI694057B (en) | Method for manufacturing gypsum and method for manufacturing cement composition | |
| JP5171705B2 (en) | Treatment method for fluorine-containing wastewater | |
| JP2010234306A (en) | Selenium insolubilization method | |
| JP7191753B2 (en) | Method for treating selenium-containing water | |
| JP5306977B2 (en) | Method for treating boron-containing water and boron removing agent | |
| JP2003340465A (en) | Method for cleaning waste water, groundwater or soil leachate | |
| JP2016168545A (en) | Heavy metal treatment material and treatment method of heavy metal-containing fly ash washing liquid | |
| JP6901807B1 (en) | Treatment method of water containing selenate ion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20111213 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120518 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20120604 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20120727 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20121105 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20121122 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20121129 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20121122 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5158520 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20151221 Year of fee payment: 3 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |