JP2002126758A - Method for treating water - Google Patents
Method for treating waterInfo
- Publication number
- JP2002126758A JP2002126758A JP2000330657A JP2000330657A JP2002126758A JP 2002126758 A JP2002126758 A JP 2002126758A JP 2000330657 A JP2000330657 A JP 2000330657A JP 2000330657 A JP2000330657 A JP 2000330657A JP 2002126758 A JP2002126758 A JP 2002126758A
- Authority
- JP
- Japan
- Prior art keywords
- wastewater
- selenium
- compound
- ferrous
- ferric
- 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
- Removal Of Specific Substances (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃水に含まれる重
金属を効果的に除去して排水基準以下に低減する処理方
法に関し、特にセレンおよびクロムを含有する廃水につ
いて、これらを効果的に沈澱除去することができる処理
方法に関する。本発明の廃水処理方法は、セメント製造
工程で発生するダスト(飛灰)などの廃棄物から銅、鉛、
亜鉛などの重金属を回収する処理工程において、水洗脱
塩処理の排水処理方法として有用である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment method for effectively removing heavy metals contained in wastewater to reduce the amount of wastewater to below a wastewater standard, and more particularly, to effectively remove and precipitate selenium and chromium-containing wastewater. A processing method that can be performed. The wastewater treatment method of the present invention, copper, lead, and the like generated from waste (fly ash) generated in the cement manufacturing process.
It is useful as a wastewater treatment method for washing and desalination in a treatment step of recovering heavy metals such as zinc.
【０００２】[0002]
【従来の技術】廃水中にクロムと共にセレンが含有され
ている場合、その処理の第一段階として、液性をｐＨ３
付近の酸性に調整し、これに亜硫酸ナトリウム等の還元
剤を添加して６価クロムを３価クロムに還元し、この３
価クロムを銅や鉛、亜鉛など他の重金属と共に水酸化物
あるいは硫化物として沈澱させ固液分離し、次いで第二
段階として、この濾液に硫酸第二鉄や塩化第二鉄など３
価の第二鉄イオン源を加えて液中のセレンを水酸化第二
鉄と共に沈澱させ、固形物として除去する処理方法が従
来知られている。なお、排水基準を上回る液中の重金属
はさらにこの濾液をキレート樹脂に通液して吸着させる
ことにより低減している。2. Description of the Related Art When selenium is contained together with chromium in waste water, the pH of the liquid is adjusted to pH 3 as the first step of the treatment.
The acid was adjusted to near acidity, and a reducing agent such as sodium sulfite was added thereto to reduce hexavalent chromium to trivalent chromium.
Chromium (IV) is precipitated as hydroxide or sulfide together with other heavy metals such as copper, lead and zinc and separated into solid and liquid. Then, as a second step, the filtrate is mixed with ferric sulfate and ferric chloride.
Conventionally, there has been known a treatment method in which selenium in a liquid is precipitated together with ferric hydroxide by adding a valent ferric ion source, and is removed as a solid. The heavy metals in the liquid exceeding the effluent standard are further reduced by passing the filtrate through a chelate resin and adsorbing it.
【０００３】[0003]
【発明が解決しようとする課題】従来の上記処理方法
は、処理工程が数段階にわたるため手間がかかり、シス
テム全体が大掛かりなものになる。また、セレンを水酸
化第二鉄と共沈させて除去しているが、４価のセレンイ
オンは沈澱しても６価のセレンイオンは沈澱せず、従っ
てセレンを十分に除去できないと云う問題がある。In the above-mentioned conventional processing method, since the processing steps are performed in several stages, it takes time and effort, and the whole system becomes large-scale. Further, selenium is removed by coprecipitation with ferric hydroxide. However, even if tetravalent selenium ions precipitate, hexavalent selenium ions do not precipitate, and thus selenium cannot be sufficiently removed. There is.
【０００４】本発明の処理方法は、従来の処理方法にお
けるこのような問題を解決したものであり、廃水中にセ
レンやクロムが含まれている場合にも、効率良くセレン
やクロムを沈澱させて除去することができる処理方法を
提供する。[0004] The treatment method of the present invention solves such a problem in the conventional treatment method. Even when selenium or chromium is contained in waste water, selenium or chromium can be efficiently precipitated. Provide a processing method that can be removed.
【０００５】[0005]
【課題を解決する手段】本発明者は廃水に含まれるセレ
ンおよびクロムの除去方法について種々検討した結果、
６価セレンが２価の水酸化第一鉄と共に沈澱することを
見い出した。また、水酸化第一鉄を生成させるために２
価鉄イオン源(硫酸第一鉄など)を廃水に添加した場合、
この２価鉄イオンの還元性によって液中の６価クロムの
還元も同時に行われ、さらにこの液性をアルカリ性に調
整することにより、液中に含まれる銅、亜鉛、鉛など他
の重金属もセレンおよびクロムと共に水酸化第一鉄や水
酸化第二鉄に伴って沈澱し、これらを固形物として効率
よく分離除去できることを見い出した。本発明の処理方
法はかかる知見に基づくものである。As a result of various studies on a method for removing selenium and chromium contained in wastewater, the present inventor has found that
Hexavalent selenium was found to precipitate with divalent ferrous hydroxide. Also, in order to produce ferrous hydroxide, 2
When a ferrous ion source (such as ferrous sulfate) is added to wastewater,
Hexavalent chromium in the liquid is reduced at the same time by the reducibility of the iron (II) ions, and by further adjusting the liquidity to alkaline, other heavy metals such as copper, zinc, and lead contained in the liquid can be selenium. And chromium, and precipitated along with ferrous hydroxide and ferric hydroxide, and found that these could be efficiently separated and removed as solids. The processing method of the present invention is based on such knowledge.
【０００６】すなわち、本発明は、（１）セレンを含む
廃水に、第一鉄化合物と第二鉄化合物を添加して液性を
アルカリ性に調整し、生成した水酸化第一鉄および水酸
化第二鉄と共に４価のセレンと６価のセレンを沈澱させ
ることを特徴とする廃水処理方法である。That is, according to the present invention, (1) a ferrous compound and a ferric compound are added to wastewater containing selenium to adjust the liquidity to alkaline, and the generated ferrous hydroxide and ferrous hydroxide are formed. A wastewater treatment method characterized in that tetravalent selenium and hexavalent selenium are precipitated together with diiron.
【０００７】本発明の処理方法は、（２）セレンと共に
クロムを含む廃水に、第一鉄化合物と第二鉄化合物を添
加して液性をアルカリ性に調整し、生成した水酸化第一
鉄および水酸化第二鉄と共に４価セレンと６価セレンを
沈澱させ、さらに液中の第一鉄イオンによって６価クロ
ムを３価クロムに還元して水酸化物とし、上記沈澱と一
緒に共沈させる廃水処理方法、（３）廃水に第一鉄化合
物と第二鉄化合物を添加した後に、廃水のｐＨを３以下
に調整し、次いで、アルカリ源を添加して廃水のｐＨを
８〜１２に調整する廃水処理方法、（４）廃水中のセレ
ンおよび／またはクロムと共に重金属を沈澱させる廃水
処理方法、（５）廃水中のセレンまたはクロム以外の重
金属が銅、亜鉛、鉛、カドミウムの１種または２種以上
である廃水処理方法、（６）廃水が重金属を含有する廃
棄物を水浸出して固液分離した排液である廃水処理方法
を含む。The treatment method of the present invention is characterized in that (2) a ferrous compound and a ferric compound are added to waste water containing chromium together with selenium to adjust the liquidity to alkaline, and to produce ferrous hydroxide and Precipitate selenium and hexavalent selenium together with ferric hydroxide, further reduce hexavalent chromium to trivalent chromium by ferrous ions in the liquid to form a hydroxide, and co-precipitate with the precipitate. Wastewater treatment method, (3) After adding the ferrous compound and the ferric compound to the wastewater, adjust the pH of the wastewater to 3 or less, and then add an alkali source to adjust the pH of the wastewater to 8 to 12. Wastewater treatment method, (4) wastewater treatment method in which heavy metals are precipitated together with selenium and / or chromium in wastewater, and (5) one or two of heavy metals other than selenium or chromium in wastewater are copper, zinc, lead, and cadmium. Wastewater treatment methods that are more than species , Including waste water treatment method is drainage and water leaching to solid-liquid separation waste containing heavy metals (6) waste.
【０００８】本発明の処理方法の適用例としては、
（７）廃棄物を水洗して脱塩する処理工程で得られる水
性スラリー(水性懸濁液)を固液分離した廃液に、第一鉄
化合物と第二鉄化合物を添加して液性をアルカリ性に調
整し、廃液に含まれる重金属を沈殿させて除去する上記
(1)〜(6)の何れかに記載する廃水処理方法、（８）飛灰
の水洗脱塩処理で生じた排水を処理する廃水処理方法、
（９）セレンを含む廃水に添加する第一鉄化合物と第二
鉄化合物として、重金属を沈殿除去した廃水に第一鉄化
合物と第二鉄化合物を溶解させたものを用いる上記(1)
〜(8)の何れかに記載する廃水処理方法などが挙げられ
る。As an application example of the processing method of the present invention,
(7) A ferrous compound and a ferric compound are added to a waste liquid obtained by solid-liquid separation of an aqueous slurry (aqueous suspension) obtained in a treatment step of washing and desalinating waste to make the liquid alkaline. Above to precipitate and remove heavy metals contained in the waste liquid
(1) a wastewater treatment method according to any one of (6), (8) a wastewater treatment method for treating wastewater generated by washing and desalination of fly ash,
(9) As the ferrous compound and the ferric compound to be added to the wastewater containing selenium, those obtained by dissolving the ferrous compound and the ferric compound in the wastewater from which heavy metals have been removed are used (1).
To (8).
【０００９】[0009]
【発明の実施の形態】以下、本発明を実施形態に基づい
て詳細に説明する。本発明の廃水処理方法は、セレン含
む廃水に、第一鉄化合物と第二鉄化合物を添加して液性
をアルカリ性に調整し、生成した水酸化第一鉄および水
酸化第二鉄と共に４価のセレンと６価のセレンを沈澱さ
せることを特徴とするものである。廃液に加える２価の
第一鉄化合物としては硫酸第一鉄、３価の第二鉄化合物
としては塩化第二鉄などを用いることができる。沈澱の
生成は概ね以下のように推察される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. In the wastewater treatment method of the present invention, a ferrous compound and a ferric compound are added to wastewater containing selenium to adjust the liquidity to alkaline, and the produced ferrous hydroxide and ferric hydroxide are tetravalent. Of selenium and hexavalent selenium. Ferrous sulfate can be used as the divalent ferrous compound to be added to the waste liquid, and ferric chloride can be used as the trivalent ferric compound. The formation of a precipitate is generally inferred as follows.
【００１０】廃液に硫酸第一鉄および塩化第二鉄などを
加えるとおのおの液中で２価の第一鉄イオン(Ｆｅ2+)、
３価の第二鉄イオン(Ｆｅ3+)を生じる。ここで、２価の
第一鉄イオンは還元性を有するので、液中に含まれる６
価のセレン(セレン酸イオン)の大部分は第一鉄イオンにより４
価のセレン(亜セレン酸イオン)に還元されるものと考えられ
る。４価のセレンは水酸化第一鉄および水酸化第二鉄の
沈殿に吸着され、または捕集された状態で共沈する。ま
た、一部のセレンは金属の状態まで還元され金属セレン
として沈殿する場合もあると考えられる。同様に、廃水
中にセレンと共に溶存する６価のクロムは第一鉄イオン
によって３価のクロムに還元され、この３価クロムは廃
水をアルカリ性に調整することにより水酸化クロムの沈
澱を生じるので、セレンと共に水酸化第一鉄や水酸化第
二鉄の沈澱と一緒に固液分離することができる。When ferrous sulfate and ferric chloride are added to the waste liquid, ferrous ion (Fe 2+ ),
This produces trivalent ferric ions (Fe 3+ ). Here, since the ferrous divalent ion has a reducing property, it is contained in the liquid.
Most of the valence selenium (selenate ion) is
It is thought that the selenium is reduced to selenium (selenite ion). Tetravalent selenium is adsorbed on the precipitates of ferrous hydroxide and ferric hydroxide or co-precipitated in a collected state. It is also considered that some selenium is reduced to a metal state and may precipitate as metal selenium. Similarly, hexavalent chromium dissolved together with selenium in wastewater is reduced to trivalent chromium by ferrous ions, and this chromium (III) causes precipitation of chromium hydroxide by adjusting the wastewater to alkaline, Solid-liquid separation can be performed together with precipitation of ferrous hydroxide or ferric hydroxide together with selenium.
【００１１】硫酸第一鉄などの第一鉄化合物の添加量
は、主に廃水中のセレン含有量およびクロム含有量によ
って異なり、例えばセレン含有量１ppmあたり第一鉄イ
オンとして約２５００ppm以上であれば良く、塩化第二
鉄などの第二鉄化合物の添加量はセレン含有量１ppmあ
たり第二鉄イオンとして２５０〜１０００ppmであれば
良い。The amount of the ferrous compound such as ferrous sulfate mainly depends on the selenium content and the chromium content of the wastewater. For example, if the ferrous ion is about 2500 ppm or more per 1 ppm of selenium, The ferric compound such as ferric chloride may be added in an amount of 250 to 1000 ppm as ferric ion per 1 ppm selenium content.
【００１２】６価セレンおよび６価クロムの還元を進め
た後に、この廃水にアルカリ源を加えてｐＨを約８〜１
２程度のアルカリ性に調整し、水酸化第一鉄および水酸
化第二鉄の沈澱を生じさせる。アルカリ源としては水酸
化カルシウムなどが適当である。生じた沈殿は後処理工
程においてセメント原料の一部として回収し、再利用す
ることが出来る。またこの沈殿には水酸化第二鉄が含ま
れるため、濾液中に残存する鉄濃度は著しく低減され
る。After the reduction of hexavalent selenium and hexavalent chromium is promoted, an alkaline source is added to the wastewater to adjust the pH to about 8 to 1.
Adjust the alkalinity to about 2 to cause precipitation of ferrous hydroxide and ferric hydroxide. As the alkali source, calcium hydroxide or the like is suitable. The resulting precipitate can be recovered as a part of the cement raw material in the post-treatment step and reused. Since the precipitate contains ferric hydroxide, the concentration of iron remaining in the filtrate is significantly reduced.
【００１３】また、廃水がセレンおよび／またはクロム
と共に銅、亜鉛、鉛、カドミウムなどの重金属を１種ま
たは２種以上含む場合、廃水のｐＨ調整によってこれら
の重金属は水酸化物沈澱を生じ、あるいは水酸化第一鉄
または水酸化第二鉄に吸着ないし捕集されて共沈する。When the wastewater contains one or more heavy metals such as copper, zinc, lead and cadmium together with selenium and / or chromium, these heavy metals may form hydroxide precipitates by adjusting the pH of the wastewater, or Adsorbed or collected by ferrous hydroxide or ferric hydroxide and co-precipitated.
【００１４】本発明の処理を施した廃水を砂濾過し、浮
遊粒子状物質および上記固液分離で除去しきれなかった
残存水酸化鉄沈澱がある場合はこれも除去し、キレート
樹脂に通液し、液中の重金属をキレート樹脂に吸着させ
てさらに低減しても良い。また、キレート樹脂に通液す
ることにより、液中に微量に残存する鉄も除去すること
ができる。キレート樹脂は一般に使用されているもので
良い。通液条件は樹脂の種類に従って調整すれば良い。
また、廃水中のＣＯＤが高い場合には、キレート樹脂に
通液した後に、次亜塩素酸ナトリウム等を添加してＣＯ
Ｄを低下する。The wastewater subjected to the treatment of the present invention is subjected to sand filtration to remove suspended particulate matter and any remaining iron hydroxide precipitate that could not be removed by the solid-liquid separation, if any, and then pass the solution through a chelating resin. Then, the heavy metal in the liquid may be absorbed by the chelate resin to further reduce it. In addition, by passing the solution through the chelate resin, a small amount of iron remaining in the solution can be removed. The chelate resin may be a commonly used one. The conditions for passing the liquid may be adjusted according to the type of the resin.
When the COD in the wastewater is high, after passing through the chelating resin, sodium hypochlorite or the like is added to reduce CO2.
D is reduced.
【００１５】本発明の廃水処理方法は、廃棄物から銅、
鉛、亜鉛などの重金属を回収する処理工程において、そ
の排水処理方法として好適である。セメント系ダスト、
特に廃棄物を原料としたセメント製造工程から発生する
ダストには銅、鉛、亜鉛などの重金属が少量含まれてお
り、これらの重金属を分離し回収する試みがなされてい
る。この処理工程の一例は、ダストを水洗して脱塩し、
この脱塩ケーキを硫酸浸出して銅および亜鉛を溶出さ
せ、その濾液に酸性下で亜鉛粉末を添加して銅を沈澱さ
せて回収し、次いで濾液をアルカリ性に調整して液中の
亜鉛を水酸化物沈澱とし、一方、脱塩ケーキの固形分に
アルカリを加えて鉛を溶出させると共に固形分に含まれ
る石膏を水酸化物に転じて沈澱させ、これを固液分離し
て回収した後に、水硫化ソーダ等を加えて液中の鉛を硫
化物として沈澱させ、回収する。あるいは、上記硫酸浸
出スラリーの濾液と上記アルカリ浸出スラリーの濾液と
を混合し、ｐＨを銅、亜鉛および鉛の共沈範囲に調整し
てこれらの沈澱を分離回収する。The wastewater treatment method of the present invention comprises the steps of:
In a processing step of recovering heavy metals such as lead and zinc, it is suitable as a wastewater treatment method. Cement dust,
In particular, dust generated from a cement manufacturing process using waste as a raw material contains a small amount of heavy metals such as copper, lead, and zinc, and attempts have been made to separate and recover these heavy metals. One example of this processing step is to wash and desalt the dust with water,
The desalted cake is leached with sulfuric acid to elute copper and zinc, and zinc powder is added to the filtrate under acidic conditions to precipitate and recover copper.Then, the filtrate is adjusted to alkaline and the zinc in the liquid is removed from water. Oxide precipitation, on the other hand, alkali was added to the solid content of the desalted cake to elute lead, and the gypsum contained in the solid content was turned into hydroxide and precipitated, and this was collected by solid-liquid separation and collected. Lead in the liquid is precipitated as sulfide by adding sodium bisulfide or the like, and collected. Alternatively, the filtrate of the sulfuric acid leaching slurry and the filtrate of the alkali leaching slurry are mixed, and the pH is adjusted to the range of coprecipitation of copper, zinc and lead, and these precipitates are separated and recovered.
【００１６】なお、この水洗脱塩工程において、廃棄物
(ダスト等)の水性スラリーのｐＨを８.５〜１３の範囲
に調整すれば、廃棄物に含まれる重金属の溶出を抑制し
て脱塩することができる。この水性スラリーを固液分離
した排液に第一鉄化合物と第二鉄化合物を添加し、水酸
化カルシウム等を加えてアルカリ性に調整し、液中に含
まれるセレン、クロム、あるいはその他の重金属を沈澱
させて除去する。このとき、高分子凝集剤を添加すると
沈澱の凝集性が一層高まるので好ましい。In the washing and desalting step, waste
By adjusting the pH of the aqueous slurry of (dust or the like) to a range of 8.5 to 13, it is possible to suppress the elution of heavy metals contained in the waste and desalt. A ferrous compound and a ferric compound are added to a waste liquid obtained by solid-liquid separation of this aqueous slurry, and calcium hydroxide is added to adjust the alkalinity to remove selenium, chromium, or other heavy metals contained in the liquid. Precipitate and remove. At this time, it is preferable to add a polymer coagulant since the coagulability of the precipitate is further increased.
【００１７】[0017]
【実施例】以下、実施例によって本発明を具体的に示
す。 〔実施例〕セメント系ダストの水洗水に、塩化第二鉄水
溶液(5vol％)を３価の鉄イオンが５００mg/lになるよう
に（重量比でセレン１に対してＦｅ3+が５００以上）添
加し、さらに硫酸第一鉄水溶液(５vol％)を２価の鉄イ
オンが５０００mg/lになるように（重量比でセレン１に
対してＦｅ2+が５０００以上）添加した。この水洗水の
ｐＨは２.５であった（pH３以上のときには硫酸を加え
てpHを2.5にした）。次いで、水酸化カルシウム水溶液
(0.1vol％)を添加して、水洗水のｐＨを９.５に調整
し、３０分間攪拌して沈澱を生成させ、この沈澱をフィ
ルタープレスで固液分離した。この濾液に含まれる重金
属量を処理前と対比して表１に示した。さらに、この濾
液を砂濾過(SV=20)した後に、ｐＨ５に調整してキレー
ト樹脂(イミノ二酢酸系)カラムに通液(SV=20)し、この
排水に硫酸を加えてｐＨ７.５に調整して外部に排出し
た。最終的な排水の重金属濃度を表１に対比して示し
た。EXAMPLES The present invention will be specifically described below with reference to examples. [Embodiment] An aqueous ferric chloride solution (5 vol%) was added to the washing water of cement-based dust so that trivalent iron ions became 500 mg / l (the weight ratio of selenium to Fe 3+ was 500 or more. ), And an aqueous ferrous sulfate solution (5 vol%) was added so that the amount of divalent iron ions was 5000 mg / l (the weight ratio of selenium to Fe 2+ was 5000 or more). The pH of the washing water was 2.5 (when the pH was 3 or more, sulfuric acid was added to adjust the pH to 2.5). Then, an aqueous solution of calcium hydroxide
(0.1 vol%), the pH of the washing water was adjusted to 9.5, and the mixture was stirred for 30 minutes to form a precipitate, and the precipitate was solid-liquid separated by a filter press. The amounts of heavy metals contained in this filtrate are shown in Table 1 in comparison with those before the treatment. The filtrate was further subjected to sand filtration (SV = 20), adjusted to pH 5 and passed through a chelate resin (iminodiacetic acid) column (SV = 20), and sulfuric acid was added to the waste water to adjust the pH to 7.5. Adjusted and discharged outside. The heavy metal concentration of the final wastewater is shown in comparison with Table 1.
【００１８】〔比較例１、２〕塩化第二鉄水溶液または
硫酸第一鉄水溶液の何れか一つを用いた以外は実施例と
同様にして生成した沈澱を固液分離した。この濾液に含
まれる重金属量を処理前と対比して表１に示した。[Comparative Examples 1 and 2] A precipitate formed was subjected to solid-liquid separation in the same manner as in the Example except that one of an aqueous ferric chloride solution and an aqueous ferrous sulfate solution was used. The amounts of heavy metals contained in this filtrate are shown in Table 1 in comparison with those before the treatment.
【００１９】表１に示すように、セレン、クロムおよび
その他の重金属類を含む廃水に本発明の処理を施すこと
によって、何れの重金属類に対しても顕著な除去効果が
見られた。更にこれを砂濾過およびキレート樹脂を通液
することにより何れの重金属類も排水基準を大幅に下回
る含有濃度値になった。一方、塩化第二鉄を単独で用い
た比較例１は、セレンが殆ど除去されず、また、硫酸第
一鉄を単独に用いた比較例２は排水基準を大幅に上回る
鉄が処理後に残留していた。As shown in Table 1, when the wastewater containing selenium, chromium and other heavy metals was subjected to the treatment of the present invention, a remarkable effect of removing any heavy metals was observed. Further, by passing the mixture through a sand filter and a chelating resin, the concentration of each heavy metal was significantly lower than the effluent standard. On the other hand, in Comparative Example 1 using ferric chloride alone, selenium was hardly removed, and in Comparative Example 2 using ferrous sulfate alone, iron significantly exceeding the wastewater standard remained after treatment. I was
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】本発明の廃水処理方法によれば、廃水中
のセレンやクロム、およびその他の重金属を容易に排水
基準以下に低減することができる。さらに本発明では、
廃水処理の際に添加した鉄についても効率よく除去され
るので、後工程に負荷が殆どかからない。また、本発明
の方法は処理工程が少ないのでシステム全体を小型化す
ることができる。According to the wastewater treatment method of the present invention, selenium, chromium, and other heavy metals in wastewater can be easily reduced to a level below the wastewater standard. Further, in the present invention,
Since iron added during wastewater treatment is also efficiently removed, little load is imposed on the subsequent steps. Further, the method of the present invention can reduce the size of the entire system because the number of processing steps is small.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０１Ｇ 37/00 Ｃ０１Ｇ 37/00 (72)発明者 大神 剛章 千葉県佐倉市大作二丁目４番２号 太平洋 セメント株式会社中央研究所内 (72)発明者 三浦 啓一 千葉県佐倉市大作二丁目４番２号 太平洋 セメント株式会社中央研究所内 Ｆターム(参考） 4D038 AA08 AB65 AB68 AB69 AB70 AB71 AB74 AB82 BB13 BB18 4G048 AA01 AB08 AE01 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C01G 37/00 C01G 37/00 (72) Inventor Takeaki Ogami 2-4-2, Daisaku, Sakura City, Chiba Prefecture Pacific Cement Co., Ltd. Central Research Laboratory (72) Inventor Keiichi Miura 2-4-2, Daisaku, Sakura City, Chiba Prefecture Pacific Cement Co., Ltd. Central Research Laboratory F-term (reference) 4D038 AA08 AB65 AB68 AB69 AB70 AB71 AB74 AB82 BB13 BB18 4G048 AA01 AB08 AE01
Claims (9)
二鉄化合物を添加して液性をアルカリ性に調整し、生成
した水酸化第一鉄および水酸化第二鉄と共に４価のセレ
ンと６価のセレンを沈澱させることを特徴とする廃水処
理方法。1. A ferrous compound and a ferric compound are added to waste water containing selenium to adjust the liquidity to alkaline, and tetravalent selenium is formed together with the produced ferrous hydroxide and ferric hydroxide. And a hexavalent selenium precipitate.
鉄化合物と第二鉄化合物を添加して液性をアルカリ性に
調整し、生成した水酸化第一鉄および水酸化第二鉄と共
に４価セレンと６価セレンを沈澱させ、さらに液中の第
一鉄イオンによって６価クロムを３価クロムに還元して
水酸化物とし、上記沈澱と一緒に共沈させる請求項１の
廃水処理方法。2. A ferrous compound and a ferric compound are added to waste water containing chromium together with selenium to adjust the liquidity to alkaline, and the resulting ferrous hydroxide and ferric hydroxide are tetravalent. The wastewater treatment method according to claim 1, wherein selenium and hexavalent selenium are precipitated, and hexavalent chromium is reduced to trivalent chromium by ferrous ions in the liquid to form a hydroxide, and coprecipitated with the precipitate.
加した後に、廃水のｐＨを３以下に調整し、次いで、ア
ルカリ源を添加して廃水のｐＨを８〜１２に調整する請
求項１または２の廃水処理方法。3. The method of claim 1, wherein after the ferrous compound and the ferric compound are added to the wastewater, the pH of the wastewater is adjusted to 3 or less, and then the pH of the wastewater is adjusted to 8 to 12 by adding an alkali source. Item 1. The wastewater treatment method according to Item 1 or 2.
共に重金属を沈澱させる請求項１、２または３の廃水処
理方法。4. The wastewater treatment method according to claim 1, wherein heavy metals are precipitated together with selenium and / or chromium in the wastewater.
属が銅、亜鉛、鉛、カドミウムの１種または２種以上で
ある請求項１〜４の何れかに記載する廃水処理方法。5. The wastewater treatment method according to claim 1, wherein the heavy metal other than selenium or chromium in the wastewater is one or more of copper, zinc, lead, and cadmium.
して固液分離した排液である請求項１〜５の何れかに記
載する廃水処理方法。6. The wastewater treatment method according to claim 1, wherein the wastewater is a wastewater obtained by subjecting a waste containing a heavy metal to water leaching and solid-liquid separation.
られる水性スラリー(水性懸濁液)を固液分離した廃液
に、第一鉄化合物と第二鉄化合物を添加して液性をアル
カリ性に調整し、廃液に含まれる重金属を沈殿させて除
去する請求項１〜６の何れかに記載する廃水処理方法。7. A waste liquid obtained by solid-liquid separation of an aqueous slurry (aqueous suspension) obtained in a treatment step of washing and desalting waste with a ferrous compound and a ferric compound, The wastewater treatment method according to any one of claims 1 to 6, wherein the wastewater is adjusted to be alkaline and heavy metals contained in the waste liquid are precipitated and removed.
する請求項１〜７の何れかに記載する廃水処理方法。8. The wastewater treatment method according to claim 1, wherein wastewater generated in the washing and desalination of fly ash is treated.
物と第二鉄化合物として、重金属を沈殿除去した廃水に
第一鉄化合物と第二鉄化合物を溶解させたものを用いる
請求項１〜８の何れかに記載する廃水処理方法。9. The ferrous compound and the ferric compound to be added to the selenium-containing wastewater are those obtained by dissolving a ferrous compound and a ferric compound in wastewater from which heavy metals have been removed by precipitation. 8. The wastewater treatment method according to any one of 8 above.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014126122A1 (en) * | 2013-02-18 | 2014-08-21 | 千代田化工建設株式会社 | System for treating selenium-containing wastewater, method for treating selenium-containing wastewater, and method for recovering selenium from selenium-containing wastewater |
| JP2014156380A (en) * | 2013-02-18 | 2014-08-28 | Chiyoda Corp | Method of recovering selenium from selenium-containing drainage |
| JP2014155912A (en) * | 2013-02-18 | 2014-08-28 | Chiyoda Corp | System and method for treating selenium-containing drainage |
| JP2016019968A (en) * | 2014-06-19 | 2016-02-04 | 宇部興産株式会社 | Processing method for incineration ash |
| JP2016168545A (en) * | 2015-03-12 | 2016-09-23 | 戸田工業株式会社 | Heavy metal treatment material and treatment method of heavy metal-containing fly ash washing liquid |
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