JP3696943B2 - Treatment agent for heavy metal removal from wastewater and wastewater treatment method using the same - Google Patents
Treatment agent for heavy metal removal from wastewater and wastewater treatment method using the same Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、金属表面処理工程、電子部品等の製造工程等において生ずる、重金属を含有した廃水から重金属を効果的に分離・除去処理することのできる廃水中の重金属除去用処理剤およびそれを用いた廃水処理方法に関するものである。
【０００２】
【従来の技術】
従来から、種々の重金属物質が、電気・電子部品の製造、有機合成、染色加工、皮革加工、メッキ等の各種分野で汎用されており、上記分野において重金属を使用した施設からの廃水中には、重金属イオンが含有されている。このような重金属イオンを含有する廃水は、河川を汚染し、しかも人体をはじめ生物に多大な悪影響を与えることから、様々な廃水処理が施されている。例えば、このような廃水処理方法の一例として、キレート処理があげられる。このキレート処理は、上記重金属含有廃水に、配位子となる官能基を有するキレート剤を投入して金属錯体を生成させ、必要に応じｐＨコントロールを行うことによって重金属を除去する処理方法である。また、上記キレート処理以外に、イオン交換樹脂を用いた重金属含有廃水処理があげられる。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来の重金属含有廃水処理方法は、処理コストが高く、特殊な設備を要するために設備投資費がかさみ、また処理手順、すなわち処理操作が難しい等の問題を有している。このように、従来の重金属含有廃水処理方法は上記問題を有していることから、処理が容易で、かつ特殊な設備等を必要としない廃水処理方法が望まれている。
【０００４】
本発明は、このような事情に鑑みなされたもので、効率良く廃水中の重金属を取り込み廃水から分離除去することのできる廃水中の重金属除去用処理剤、およびそれを用いて、特別な設備を要することなく、低コストで処理可能な廃水処理方法の提供をその目的とする。
【０００５】
【課題を解決するための手段】
上記の目的を達成するため、本発明は、廃水中の重金属と金属錯体をつくるノボラック樹脂と、上記ノボラック樹脂を廃水に溶解させるためのアルカリ性物質を含有する重金属除去用処理剤であって、上記ノボラック樹脂と重金属との金属錯体が、廃水に対する酸性物質の添加により、ｐＨ３〜５．５の酸性領域において不溶化する廃水中の重金属（クロム、六価クロムを除く）除去用処理剤を第１の要旨とし、上記重金属除去用処理剤を、重金属含有廃水に添加して均一に混合し、ノボラック樹脂と重金属の金属錯体を形成する工程と、上記混合液に酸性物質を添加し、上記金属錯体をｐＨ３〜５．５の酸性領域において不溶化させて重金属を含有した沈殿物質を生成させる工程と、上記混合液から沈殿物質を分離する工程とを備えた廃水処理方法を第２の要旨とする。
【０００６】
【発明の実施の形態】
本発明は、廃水中の重金属と金属錯体をつくるノボラック樹脂と、このノボラック樹脂を廃水に溶解させるためのアルカリ性物質を含有する重金属除去用処理剤を用い、この重金属除去用処理剤を重金属含有廃水に添加して均一に混合し、ノボラック樹脂と重金属の金属錯体を形成する。そして、この混合液に酸性物質を添加し、上記金属錯体をｐＨ３〜５．５の酸性領域において不溶化させて重金属を含有した沈殿物質を生成させることにより、廃水を上澄み液と沈殿物質とに分離し、上記沈殿物質を分離除去する廃水処理方法である。すなわち、上記重金属除去用処理剤を用いるため、廃水中の重金属が高効率でノボラック樹脂に取り込まれ沈殿物質を生成することから、残る上澄み液中の重金属濃度は非常に低いものとなる。このように、本発明の処理は、特殊な設備を必要とせず、上記重金属除去用処理剤を添加することにより重金属の金属錯体を形成させ、続いて、酸性物質を添加して、系全体をｐＨ３〜５．５の酸性領域に調整することにより不溶化させて沈殿物質を形成させるものである。したがって、操作手順が簡単であり、安価で処理することができる。そして、本発明の廃水処理方法を経由した重金属含有廃水は、重金属含有濃度の非常に低い上澄み液と沈殿物質とに分離されるため、上記沈殿物質を分離除去し、残る上澄み液の処理も容易となる。
【０００７】
特に、上記ノボラック樹脂としては、前記一般式（１）で表されるものが好適に用いられる。
【０００８】
つぎに、本発明を詳しく説明する。
【０００９】
本発明の廃水処理方法において、その処理対象となる重金属含有廃水とは、一般に重金属と呼称される比重の大きい金属、例えば、カドミウム、水銀、ニッケル、鉄、マンガン、銅、鉛、砒素等の重金属イオンを含有した廃水をいう。
【００１０】
本発明の廃水処理に用いられる重金属除去用処理剤としては、ノボラック樹脂と、アルカリ性物質とを用いて得られる。より具体的には、上記ノボラック樹脂を溶解し含有したアルカリ性水性液が用いられる。なお、上記アルカリ性水性液とは、ノボラック樹脂が完全に溶解した水溶液状態はもちろん、乳化液状態をも含む趣旨である。
【００１１】
上記ノボラック樹脂は、廃水中の重金属と金属錯体をつくる作用を有し、特に限定するものではなく従来公知のものが用いられる。また、その形態としては、粒状、粉末状、フレーク状のものはもちろん、粉末状のものを打錠成形等によりペレット状に成形したものをも含む趣旨である。そして、上記ノボラック樹脂としては、下記の一般式（１）で表されるものを用いることが好ましい。特に、式（１）において、繰り返し数ｎは５〜７の正数が好適である。上記繰り返し数ｎが５〜７の正数のものを用いることにより、廃水中の重金属イオンとそれ以外の分離が一層効果的となる。
【００１２】
【化２】
上記ノボラック樹脂とともに用いられるアルカリ性物質は、ノボラック樹脂を廃水に溶解させる目的で用いられるものであって、例えば、アルカリ性水性液があげられる。このアルカリ性水性液はノボラック樹脂としては、アルカリ金属水酸化物、アルカリ土類金属水酸化物、アンモニア、アミン等の水性液があげられる。なかでも、水酸化ナトリウム、水酸化カリウムの水性液を用いることが好ましい。このアルカリ性水性液の濃度は、例えば、上記ノボラック樹脂を溶解させるのに必要な量に設定されるが、廃水に添加した際に廃水のｐＨが８以上、特に好ましくは９以上となるように配合することが好適である。
【００１４】
本発明の重金属を含有した廃水処理方法は、例えばつぎのようにして行われる。すなわち、まず、アルカリ性水性液にノボラック樹脂を溶解させてノボラック樹脂含有アルカリ性水性液（重金属除去用処理剤）を調製する。そして、このノボラック樹脂含有アルカリ性水性液を、重金属含有廃水に添加して均一に混合し、ノボラック樹脂と重金属の金属錯体を形成する。ついで、この混合液に酸性物質を添加し、上記金属錯体をｐＨ３〜５．５の酸性領域において不溶化させて重金属を含有した凝集物を生成させることにより、重金属含有廃水処理が行われる。
【００１５】
上記生成した重金属含有沈殿物質を系全体から分離する方法としては、沈降分離、加圧浮上、遠心分離、フィルタープレス法等があげられる。
【００１６】
上記ノボラック樹脂を含有するアルカリ性水性液の添加量は、廃水中に含まれる重金属イオンの種類、濃度等によって適宜に設定される。すなわち、ノボラック樹脂の添加量が少ないと重金属を充分に除去することが難しく、逆に添加量が多いと、コストアップになるとともに、スラッジの発生量が多くなる傾向がみられるからである。
【００１７】
上記処理工程において、ノボラック樹脂含有アルカリ性水性液を添加した後に廃水に添加する酸性物質としては、塩酸、硫酸、蓚酸等があげられる。上記酸性物質の添加量としては、廃水中に溶解したノボラック樹脂と重金属の金属錯体を不溶化させることができる量であればよく、系全体のｐＨをｐＨ３〜５．５の酸性領域に降下させる量に設定される。
【００１８】
本発明の廃水処理方法において、上記ノボラック樹脂含有アルカリ性水性液（重金属除去用処理剤）および酸性物質以外に、必要に応じて、無機系凝集剤や高分子凝集剤を上記ノボラック樹脂含有アルカリ性水溶液の添加と同時に適宜に添加してもよい。上記高分子凝集剤としては、ポリアクリルアマイド系凝集剤、ポリカルボン酸系凝集剤等があげられる。
【００１９】
このように、本発明の廃水処理方法では、ノボラック樹脂含有アルカリ性水性液（重金属除去用処理剤）を廃水に添加し混合して、まず、廃水中の重金属イオンをノボラック樹脂が取り込み、金属錯体を形成し、ついで、酸性物質を添加することにより、これをｐＨ ３〜５．５の酸性領域において不溶化させ沈殿させる。これにより、廃水を、上澄み液と重金属含有沈殿物質とに分離することが可能となり、上記沈殿物質を除去することにより、重金属含有廃水を処理することができる。このように処理して廃水から生成した上記上澄み液は、透明でかつ乾燥固形分を殆ど含有していない。
【００２０】
つぎに、本発明を実施例に基づいて詳しく説明する。
【００２１】
〔擬似廃水の作製〕
銅の含有量が２４ｐｐｍと、酢酸ビニル系樹脂エマルジョン１００００ｐｐｍの擬似廃水を作製した。
【００２２】
【実施例】
まず、前記一般式（１）で表されるノボラック樹脂（繰り返し数ｎ＝５）の粉末状物４０部と、水酸化ナトリウム水溶液５部と、水５５部とを混合して重金属除去用処理剤を調製した。
【００２３】
つぎに、上記擬似廃水１リットルに、上記重金属除去用処理剤および下記の表１に示す添加剤を同表に示す割合で添加し攪拌して均一に混合した。この時点での擬似廃水のｐＨは７．３であった。ついで、攪拌しながら表１に示す割合で３０％塩酸を０．３ｃｃ添加してｐＨを５．５に設定した。そして、さらに攪拌を続けた後、放置して擬似廃水である系を沈殿物質と上澄み液とに分離した。
【００２４】
【表１】
上記各処理により擬似廃水から生じた沈殿物質と上澄み液から、上澄み液を採取して、上記上澄み液中の重金属（銅）の含有割合を、水質測定システム（共立理化学研究所社製、ＵＶ１２００）により測定した。その結果を下記の表２に示す。
【００２６】
【表２】
上記表２の結果から、実施例において処理された上澄み液中の重金属含有割合は非常に低いものであって、初期の擬似廃水中の重金属が効率良くノボラック樹脂に取り込まれ沈殿物質として生成したことがわかる。
【００２８】
【発明の効果】
以上のように、本発明の重金属を含有した廃水処理方法は、ノボラック樹脂とアルカリ性物質を含有する重金属除去用処理剤を、重金属含有廃水に添加して均一に混合し、クロム、六価クロムを除く重金属とノボラック樹脂との金属錯体を形成させた後、上記混合液に酸性物質を添加して上記金属錯体をｐＨ３〜５．５の酸性領域において不溶化して重金属を含有した沈殿物質を生成させる。そして、上記重金属含有廃水を上澄み液と沈殿物質とに分離し、上記沈殿物質を分離除去する処理方法である。このように、上記重金属除去用処理剤を用いるため、廃水中の重金属が高効率でノボラック樹脂に取り込まれて沈殿物質を生成することから、残る上澄み液中の重金属濃度は非常に低いものとなり、分離した上澄み液は系外へ放出可能となる。すなわち、本発明の廃水処理方法は、特殊な設備を必要とせず、上記重金属廃水処理剤を添加することにより重金属の金属錯体を形成させ、続いて、酸性物質を添加して、系全体をｐＨ３〜５．５の酸性領域に調整することにより不溶化させて沈殿物質を形成させるものである。したがって、操作手順が簡単であり、安価で処理することができる。そして、本発明の廃水処理方法を経由した重金属含有廃水は、重金属濃度の低い上澄み液と沈殿物質とに分離されるため、上記沈殿物質を分離除去し、残る上澄み液の処理も容易となる。
【００２９】
このような重金属廃水処理方法に用いられる廃水処理剤中の上記ノボラック樹脂としては、前記一般式（１）で表されるものが特に好適に用いられる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a treatment agent for removing heavy metals in wastewater, which can effectively separate and remove heavy metals from wastewater containing heavy metals, which occurs in metal surface treatment processes, manufacturing processes of electronic components, and the like. It relates to the wastewater treatment method.
[0002]
[Prior art]
Conventionally, various heavy metal substances have been widely used in various fields such as manufacture of electrical and electronic parts, organic synthesis, dyeing, leather processing, plating, etc., and in the wastewater from facilities using heavy metals in the above fields Heavy metal ions are contained. Since wastewater containing such heavy metal ions pollutes rivers and has a great adverse effect on human bodies and other living organisms, various wastewater treatments are performed. For example, chelate treatment is an example of such a wastewater treatment method. This chelate treatment is a treatment method in which a heavy metal-containing wastewater is charged with a chelating agent having a functional group serving as a ligand to form a metal complex, and the heavy metal is removed by performing pH control as necessary. In addition to the chelate treatment, heavy metal-containing wastewater treatment using an ion exchange resin can be given.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned conventional heavy metal-containing wastewater treatment methods have problems such as high treatment costs, high equipment investment costs due to the need for special equipment, and difficulty in treatment procedures, that is, treatment operations. Thus, since the conventional heavy metal containing wastewater treatment method has the said problem, the wastewater treatment method which is easy to process and does not require special facilities etc. is desired.
[0004]
The present invention has been made in view of such circumstances, and a treatment agent for removing heavy metals in wastewater that can efficiently take in and remove heavy metals in wastewater from the wastewater, and a special facility using the same. The purpose is to provide a wastewater treatment method that can be treated at a low cost.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a novolak resin that forms a metal complex with a heavy metal in wastewater, and a treatment agent for heavy metal removal containing an alkaline substance for dissolving the novolak resin in the wastewater. A treatment agent for removing heavy metals (excluding chromium and hexavalent chromium) in wastewater in which a metal complex of novolak resin and heavy metal is insolubilized in the acidic region of pH 3 to 5.5 by addition of an acidic substance to the wastewater. In summary, the step of adding the heavy metal removal treatment agent to the heavy metal-containing wastewater and mixing it uniformly to form a metal complex of novolac resin and heavy metal, adding an acidic substance to the mixed solution, wastewater comprising a step of generating a precipitate material containing insolubilized by heavy metals in the acidic range of PH3～5.5, and separating the precipitation material from the liquid mixture The management method for the second aspect.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention uses a novolak resin that forms a metal complex with a heavy metal in wastewater, and a heavy metal removal treatment agent that contains an alkaline substance for dissolving the novolak resin in the wastewater, and the heavy metal removal treatment agent is used as a wastewater containing heavy metal. And uniformly mixed to form a metal complex of novolac resin and heavy metal. Then, an acidic substance is added to the liquid mixture, and the metal complex is insolubilized in an acidic region of pH 3 to 5.5 to generate a precipitated substance containing a heavy metal, thereby separating waste water into a supernatant liquid and a precipitated substance. And a wastewater treatment method for separating and removing the precipitated substance. That is, since the heavy metal removing treatment agent is used, heavy metal in the wastewater is taken into the novolac resin with high efficiency and produces a precipitated substance, so that the heavy metal concentration in the remaining supernatant is very low. Thus, the treatment of the present invention does not require special equipment, and the heavy metal removal treatment agent is added to form a metal complex of heavy metal, followed by addition of an acidic substance, It is insolubilized by adjusting to an acidic region of pH 3 to 5.5 to form a precipitated substance. Therefore, the operation procedure is simple and can be processed at low cost. And since the heavy metal containing wastewater which passed through the wastewater treatment method of this invention is isolate | separated into the supernatant liquid and precipitation substance with a very low heavy metal containing density | concentration, the said precipitation substance is separated and removed, and the processing of the remaining supernatant liquid is also easy. It becomes.
[0007]
In particular, as the novolac resin, those represented by the general formula (1) are preferably used.
[0008]
Next, the present invention will be described in detail.
[0009]
In the wastewater treatment method of the present invention, the heavy metal-containing wastewater to be treated is a heavy metal generally called heavy metal, for example, heavy metals such as cadmium, mercury, nickel, iron, manganese , copper , lead, and arsenic Waste water containing ions.
[0010]
The heavy metal removing treatment agent used in the wastewater treatment of the present invention can be obtained using a novolac resin and an alkaline substance. More specifically, an alkaline aqueous liquid in which the novolak resin is dissolved and contained is used. The alkaline aqueous liquid is intended to include not only the aqueous solution in which the novolak resin is completely dissolved but also the emulsion.
[0011]
The novolac resin has a function of forming a metal complex with a heavy metal in wastewater, and is not particularly limited, and conventionally known ones are used. In addition, the form includes not only granular, powder, and flakes, but also powders that are formed into pellets by tableting or the like. And as said novolak resin, it is preferable to use what is represented by following General formula (1). In particular, in the formula (1), the repeat number n is preferably a positive number of 5 to 7. By using a positive number having a repetition number n of 5 to 7, separation of heavy metal ions in the wastewater from the others becomes more effective.
[0012]
[Chemical formula 2]
The alkaline substance used together with the novolak resin is used for the purpose of dissolving the novolak resin in waste water, and examples thereof include an alkaline aqueous liquid. Examples of the novolak resin for the alkaline aqueous liquid include aqueous liquids such as alkali metal hydroxides, alkaline earth metal hydroxides, ammonia, and amines. Among these, it is preferable to use an aqueous solution of sodium hydroxide or potassium hydroxide. The concentration of the alkaline aqueous liquid is set, for example, to an amount necessary for dissolving the novolak resin, but is added so that the pH of the waste water is 8 or more, particularly preferably 9 or more when added to the waste water. It is preferable to do.
[0014]
The wastewater treatment method containing heavy metal of the present invention is performed, for example, as follows. That is, first, a novolak resin is dissolved in an alkaline aqueous liquid to prepare a novolak resin-containing alkaline aqueous liquid (treatment agent for heavy metal removal). Then, this novolac resin-containing alkaline aqueous liquid is added to the heavy metal-containing wastewater and mixed uniformly to form a metal complex of novolac resin and heavy metal. Subsequently, an acidic substance is added to this liquid mixture, the said metal complex is insolubilized in the acidic range of pH 3 to 5.5, and the aggregate containing a heavy metal is produced | generated, and a heavy metal containing wastewater process is performed.
[0015]
Examples of the method for separating the generated heavy metal-containing precipitated substance from the entire system include sedimentation separation, pressurized flotation, centrifugal separation, filter press method and the like.
[0016]
The addition amount of the alkaline aqueous liquid containing the novolak resin is appropriately set depending on the type and concentration of heavy metal ions contained in the wastewater . Ie, it is difficult to sufficiently remove heavy metals and less amount of the novolak resin, the amount added to the contrary, the more it with increase in cost, since the amount of generated sludge is often a tendency observed .
[0017]
Examples of the acidic substance added to the waste water after adding the novolak resin-containing alkaline aqueous liquid in the treatment step include hydrochloric acid, sulfuric acid, and oxalic acid. The addition amount of the acidic substance may be any amount that can insolubilize the metal complex of the novolak resin and heavy metal dissolved in the waste water, and the pH of the entire system is adjusted to pH 3 to 5 . It is set to an amount that Ru is lowered to an acidic region of 5.
[0018]
In the wastewater treatment method of the present invention, an inorganic flocculant or a polymer flocculant may be added to the novolac resin-containing alkaline aqueous solution, if necessary, in addition to the novolak resin-containing alkaline aqueous liquid (treatment agent for heavy metal removal) and acidic substances. You may add suitably simultaneously with addition. Examples of the polymer flocculant include polyacrylamide flocculants and polycarboxylic acid flocculants.
[0019]
As described above, in the wastewater treatment method of the present invention, a novolak resin-containing alkaline aqueous liquid (treatment agent for heavy metal removal) is added to and mixed with wastewater. First, the novolac resin takes in heavy metal ions in the wastewater to form a metal complex. It is then insolubilized and precipitated in the acidic region of pH 3 to 5.5 by adding an acidic substance. Thereby, it becomes possible to isolate | separate waste water into a supernatant liquid and a heavy metal containing precipitation substance, and a heavy metal containing waste water can be processed by removing the said precipitation substance. The supernatant thus produced from wastewater after treatment is transparent and contains almost no dry solids.
[0020]
Next, the present invention will be described in detail based on examples.
[0021]
Preparation of the pseudo waste water]
The content of copper was prepared and 24 ppm, the pseudo waste water vinyl acetate resin emulsion 10000 ppm.
[0022]
[ Example]
First, a heavy metal removing treatment agent by mixing 40 parts of a powdered novolak resin (repetition number n = 5) represented by the general formula (1), 5 parts of an aqueous sodium hydroxide solution and 55 parts of water. Was prepared.
[0023]
Next, the pseudo waste water to 1 liter, were uniformly mixed by stirring by adding additives shown above heavy metal removal processing agent and in Table 1 below in the proportions shown in the same table. PH of the pseudo waste water at this point was 7.3. Subsequently, 0.3 cc of 30% hydrochloric acid was added at a rate shown in Table 1 while stirring to set the pH to 5.5. After further stirring was continued to separate the left is a pseudo waste water system in the precipitation material and supernatant solution.
[0024]
[Table 1]
From precipitation buttocks material and supernatant produced or pseudo waste water et the above processes, collect on clear, and go solution, the content of heavy metals on SL on clear, and go solution (copper), water measurement system (Kyoritsu Rikagaku Research Measured by a company-made UV200). The results are shown in Table 2 below.
[0026]
[Table 2]
From the results of Table 2, heavy metal content of the supernatant processed in real施例is a very low initial heavy metal of the pseudo waste water is taken into efficient novolak resin produced as a precipitation material You can see that
[0028]
【The invention's effect】
As described above, in the method for treating wastewater containing heavy metals of the present invention, the treatment agent for removing heavy metals containing a novolak resin and an alkaline substance is added to the wastewater containing heavy metals and mixed uniformly, and chromium and hexavalent chromium are added. After forming a metal complex of the heavy metal and novolak resin to be removed , an acidic substance is added to the mixed solution to insolubilize the metal complex in an acidic region of pH 3 to 5.5 to generate a precipitated substance containing heavy metal. . And it is the processing method which isolate | separates the said heavy metal containing wastewater into a supernatant liquid and a precipitation substance, and isolate | separates and removes the said precipitation substance. Thus, since the heavy metal removing treatment agent is used, the heavy metal concentration in the remaining supernatant is very low because the heavy metal in the wastewater is taken into the novolak resin with high efficiency and produces a precipitated substance. The separated supernatant can be released out of the system. That is, the wastewater treatment method of the present invention does not require special equipment, and the heavy metal wastewater treatment agent is added to form a metal complex of heavy metal, and then an acidic substance is added to bring the entire system to pH 3 It is insolubilized by adjusting to an acidic region of ˜5.5 to form a precipitated substance. Therefore, the operation procedure is simple and can be processed at low cost. And since the heavy metal containing wastewater which passed through the wastewater treatment method of this invention is isolate | separated into the supernatant liquid and precipitation substance with a low heavy metal density | concentration, the said precipitation substance is separated and removed, and the process of the remaining supernatant liquid becomes easy.
[0029]
As the novolak resin in the wastewater treatment agent used in such a heavy metal wastewater treatment method, those represented by the general formula (1) are particularly preferably used.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22783095A JP3696943B2 (en) | 1995-09-05 | 1995-09-05 | Treatment agent for heavy metal removal from wastewater and wastewater treatment method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22783095A JP3696943B2 (en) | 1995-09-05 | 1995-09-05 | Treatment agent for heavy metal removal from wastewater and wastewater treatment method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0970587A JPH0970587A (en) | 1997-03-18 |
| JP3696943B2 true JP3696943B2 (en) | 2005-09-21 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22783095A Expired - Fee Related JP3696943B2 (en) | 1995-09-05 | 1995-09-05 | Treatment agent for heavy metal removal from wastewater and wastewater treatment method using the same |
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| Country | Link |
|---|---|
| JP (1) | JP3696943B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628099A (en) * | 2014-12-26 | 2015-05-20 | 安徽省中日农业环保科技有限公司 | Rice hull based cyanobacteria treating agent and preparation method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103263891A (en) * | 2013-05-31 | 2013-08-28 | 上海大学 | Method for preparing modified fly ash for effectively treating heavy metal waste water |
| CN103641226B (en) * | 2013-12-26 | 2016-03-02 | 上海东振环保工程技术有限公司 | A kind of heavy metal-polluted water conditioner and preparation method thereof |
| CN103964536A (en) * | 2014-04-18 | 2014-08-06 | 湖南师范大学 | Method for treating heavy metal cadmium pollution in water |
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1995
- 1995-09-05 JP JP22783095A patent/JP3696943B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628099A (en) * | 2014-12-26 | 2015-05-20 | 安徽省中日农业环保科技有限公司 | Rice hull based cyanobacteria treating agent and preparation method thereof |
| CN104628099B (en) * | 2014-12-26 | 2016-08-17 | 安徽省中日农业环保科技有限公司 | A kind of rice husk base blue algae treatment agent and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0970587A (en) | 1997-03-18 |
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