JP3387038B2 - Water purification device - Google Patents
Water purification deviceInfo
- Publication number
- JP3387038B2 JP3387038B2 JP2000034780A JP2000034780A JP3387038B2 JP 3387038 B2 JP3387038 B2 JP 3387038B2 JP 2000034780 A JP2000034780 A JP 2000034780A JP 2000034780 A JP2000034780 A JP 2000034780A JP 3387038 B2 JP3387038 B2 JP 3387038B2
- Authority
- JP
- Japan
- Prior art keywords
- metal ions
- powdery
- raw water
- sludge
- water
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 83
- 238000000746 purification Methods 0.000 title claims description 14
- 229910021645 metal ion Inorganic materials 0.000 claims description 46
- 239000010802 sludge Substances 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 32
- 239000000701 coagulant Substances 0.000 claims description 28
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 230000004931 aggregating effect Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000008213 purified water Substances 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 150000001342 alkaline earth metals Chemical class 0.000 claims 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- -1 aluminum compound Chemical class 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000274 adsorptive effect Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水中から金属イオ
ンを除去する水質浄化装置に関するものである。TECHNICAL FIELD The present invention relates to a water purification device for removing metal ions from water.
【０００２】[0002]
【従来の技術】例えば、生コン現場におけるコンクリー
ト排水や土木建築現場における土木排水、地下からの汲
み上げ水等には金属イオンが含有されていることが知ら
れ、なかでも六価クロムに代表される重金属について
は、人体に有害なものとして従来より法律や条例により
厳しい排出基準値が定められている。特に近年では、環
境問題に対する関心の高まりや環境保全の見地などから
このような排出基準値が年々厳しくなりつつある。2. Description of the Related Art For example, it is known that concrete drainage at a ready-mixed concrete site, civil engineering construction site drainage, civil engineering drainage, underground pumping water, etc. contain metal ions. As for the above, strict emission standards have been set by laws and regulations as harmful to the human body. Particularly in recent years, such emission standard values are becoming stricter year by year due to the growing interest in environmental problems and the viewpoint of environmental conservation.
【０００３】このような問題に対応し、排出基準値をク
リアするために、水の処理装置の改良や金属イオンを除
去するための有効な凝集剤等の開発など種々の試みがな
されている。このような凝集剤として、液体（水溶液）
状のものが一般に知られているが、このものは、少量で
も比較的精度よく排水に混合することができるという利
点を有する一方で、貯蔵や輸送コストが高く、現場での
調整に手間や時間がかかり装置や設備等も高コストであ
るという問題を有している。また、液体状の凝集剤の金
属イオンに対する吸着・凝集性等を向上するために、助
剤として炭酸カルシウム等を添加したものも知られてい
るが、吸着・凝集能力は依然として十分に高いとはいえ
ず、また、凝集した沈殿物が硬すぎるために沈殿槽から
の引き抜きが困難であるという問題があった。In order to address such problems and meet emission standard values, various attempts have been made such as improvement of water treatment equipment and development of effective flocculants for removing metal ions. As such a flocculant, liquid (aqueous solution)
Although such a thing is generally known, this one has the advantage that it can be mixed with wastewater with relatively high accuracy even in a small amount, but it has high storage and transportation costs, and it requires time and labor for on-site adjustment. However, there is a problem in that the cost is high and the equipment and facilities are expensive. Further, it is known that calcium carbonate or the like is added as an auxiliary agent in order to improve the adsorption / aggregation property of a liquid coagulant for metal ions, but the adsorption / coagulation ability is still sufficiently high. In addition, there was a problem that it was difficult to pull out from the settling tank because the aggregated precipitate was too hard.
【０００４】このような問題を解決するものとして、金
属イオンに対して高い吸着・凝集性を有する高性能の粉
体状凝集剤も開発されている。As a solution to such a problem, a high-performance powdery aggregating agent having a high adsorption / aggregation property for metal ions has been developed.
【０００５】[0005]
【発明が解決しようとする課題】ところで、このような
粉体状凝集剤を用いて排水等の原水の浄化処理を行う場
合、混合タンクに原水と粉体状凝集剤とを入れて混合
し、その混合物を沈殿タンクに移して、原水中の金属イ
オンを吸着し凝集した粉体状凝集剤の沈殿物と金属イオ
ンを除去した浄水とに分離し、その沈殿物を沈殿槽から
取り出して廃棄処分にしているのが通例である。その結
果、大量の沈殿物が産業廃棄物として発生するため、そ
の処分費用が嵩み、地球環境汚染にもつながるという問
題がある。When purifying raw water such as wastewater using such a powdery flocculant, the raw water and the powdery flocculant are mixed in a mixing tank. The mixture is transferred to a settling tank and separated into a precipitate of powdery flocculant that has adsorbed and aggregated metal ions in raw water and purified water from which metal ions have been removed, and the precipitate is taken out of the settling tank and discarded. It is customary to As a result, a large amount of precipitates are generated as industrial wastes, which increases the disposal cost and leads to global environmental pollution.
【０００６】そこで、この沈殿物について詳細に検討し
たところ、粉体状凝集剤は金属イオンを有効に吸着して
凝集してはいるものの、未だ十分な吸着・凝集能力を残
存していることが判明した。換言すれば、この粉体状凝
集剤は、ある程度の金属イオンを吸着した状態でもさら
に金属イオンを吸着する能力を有している。したがっ
て、通例の方法では、粉体状凝集剤の金属イオンに対す
る吸着能力を残したまま一回の原水処理で廃棄処分に附
されること、及び、その性能の高さから単位重量当りの
価格が高いことから、全体のコスト高につながり、現場
での実用化には至っていないのが現状である。[0006] Therefore, a detailed study of this precipitate revealed that the powdery flocculant effectively adsorbs metal ions and aggregates, but still retains sufficient adsorption / aggregation ability. found. In other words, this powdery aggregating agent has the ability to further adsorb metal ions even when adsorbing some metal ions. Therefore, according to the usual method, the powdery coagulant is disposed of in a single treatment of raw water with the ability to adsorb metal ions remaining, and the price per unit weight is high because of its high performance. Since it is expensive, it leads to high overall cost and has not been put to practical use on site.
【０００７】[0007]
【課題を解決するための手段】本発明は、以上のような
諸問題に鑑みて、有用な粉体状凝集剤を用いて原水から
の金属イオンの除去を高レベルに維持したまま、簡単な
構成で有効にコストダウンを図ることができる水質浄化
装置を構成するものである。In view of the above problems, the present invention provides a simple and easy method for removing metal ions from raw water at a high level by using a useful powdery flocculant. The water purification apparatus is configured so that the cost can be effectively reduced by the configuration.
【０００８】[0008]
【発明の実施の形態】すなわち、本発明の水質浄化装置
は、金属イオンを含有する原水とその金属イオンを吸着
し凝集させる粉体状凝集剤とを混合する混合槽、及び、
混合槽から送られる混合液を金属イオンを吸着した粉体
状凝集剤のスラッジと金属イオンを除去した浄水とに分
離する沈殿槽を、原水の処理工程の上流側から順に備え
たものにおいて、沈殿槽から反応槽側に向けて返送経路
を設け、沈殿槽に集められたスラッジを、この返送経路
を通じて原水に新たな粉体状凝集剤と共に添加するよう
に構成していることを特徴とする。BEST MODE FOR CARRYING OUT THE INVENTION That is, the water purification apparatus of the present invention comprises a mixing tank for mixing raw water containing metal ions and a powdery flocculant for adsorbing and coagulating the metal ions, and
A precipitation tank for separating the mixed solution sent from the mixing tank into sludge of the powdery flocculant that adsorbs metal ions and purified water from which metal ions have been removed is provided in order from the upstream side of the treatment process of raw water. It is characterized in that a return path is provided from the tank toward the reaction tank side, and the sludge collected in the settling tank is added to the raw water together with a new powdery flocculant through this return path.
【０００９】このような構成のものであると、一工程で
金属イオンを吸着しても未だ吸着能力を使い尽くしてい
ない粉体状凝集剤のスラッジを、返送経路を通じて反応
槽或いはその上流又は下流の流体経路上に戻すことで、
原水中の金属イオンをさらに吸着させることができるの
で、新たに添加する粉体状凝集剤の量を減らしても金属
イオンの除去能力を低下させることなく、コストダウン
を有効に図ることが可能となる。また、その結果とし
て、廃棄処分すべきスラッジの量も減らすことができる
ので、その面でもコストダウンを図り、地球環境の保全
にも寄与できることとなる。With such a structure, sludge of the powdery coagulant, which has not exhausted its adsorption ability even if it adsorbs metal ions in one step, is passed through the return route to the reaction tank or upstream or downstream thereof. By returning to the fluid path of
Since metal ions in raw water can be further adsorbed, even if the amount of powdery flocculant to be newly added is reduced, it is possible to effectively reduce the cost without lowering the metal ion removing ability. Become. Further, as a result, the amount of sludge to be disposed of can be reduced, which also contributes to cost reduction and conservation of the global environment.
【００１０】特に金属イオンの除去能力に優れ、本発明
の装置に好適に用いることができる粉体状凝集剤として
は、可溶性のアルミニウム化合物、可溶性の鉄塩化物及
び高分子凝集剤又はこれらに可溶性の還元剤を添加した
もの等を凝集主剤とし、これにその凝集主剤の水溶液が
ｐＨ値で中性付近を示す程度にアルカリ金属或いはアル
カリ土類金属の炭酸塩及びセメント粉粒体の少なくとも
一つを配合し、さらに土壌鉱物系粉粒体の少なくとも一
種を配合してなるものを挙げることができる。このよう
な粉体状凝集剤として市販のものには、例えばノアテッ
ク社製のスーパーナミット（商品名）が挙げられる。こ
のものは、この種の凝集剤としては金属イオンに対する
吸着力が極めて優れたものであり、取り扱いや運搬も簡
単で、金属イオンを吸着したスラッジの状態も適度に柔
らかくその脱水も容易であり、処理時間も短い等、多く
の利点を有しているが、その価格が高いために現場での
実用化が十分に図られておらず、本発明に適用するのに
最も適したものといえる。As the powdery flocculant which is particularly excellent in the ability to remove metal ions and can be suitably used in the apparatus of the present invention, a soluble aluminum compound, a soluble iron chloride and a polymer flocculant or a soluble coagulant thereof can be used. At least one of an alkali metal or alkaline earth metal carbonate and a cement powder is used as an aggregating main agent to which an aqueous solution of the aggregating main agent is added is added as a reducing agent. And a mixture of at least one kind of soil mineral-based granular material. Examples of commercially available powdery aggregating agents include Super Namito (trade name) manufactured by Noah Tech. This is a coagulant of this kind, which has an extremely excellent adsorbing power for metal ions, is easy to handle and transport, and the sludge in which the metal ions have been adsorbed is reasonably soft and easy to dehydrate, Although it has many advantages such as a short processing time, it is not suitable for practical use on site because of its high price, and it can be said that it is most suitable for application to the present invention.
【００１１】また、原水中に含まれる六価クロムの環境
への排出基準値は特に厳しく、ダムやトンネル等の土木
建築現場や生コン現場等での、処理が問題となっている
ため、本発明の粉体状凝集剤を、金属イオンとして六価
クロムを対象として吸着し凝集するものであることが望
ましい。In addition, the emission standard value of hexavalent chromium contained in raw water to the environment is particularly strict, and treatment at civil engineering and construction sites such as dams and tunnels and ready-mixed concrete sites is a problem. It is desirable that the powdery aggregating agent of (1) is adsorbed and aggregated by targeting hexavalent chromium as a metal ion.
【００１２】さらに、新たな粉体状凝集剤の使用量を有
効に低減するためには、原水を処理している間、前記ス
ラッジを原水へ連続的に添加するようにしていることが
有効である。このようにすることで、既に金属イオンを
吸着していながらまだその吸着力を失っていない粉体状
凝集剤の有効利用を促進しつつ新たな粉体状凝集剤の添
加量を低く抑えて、コストダウンを有効に図ることが可
能となる。Further, in order to effectively reduce the amount of the new powdery coagulant used, it is effective to continuously add the sludge to the raw water while treating the raw water. is there. By doing this, while suppressing the addition amount of the new powdery coagulant while promoting the effective use of the powdery coagulant that has already adsorbed the metal ions but has not lost its adsorptive power, It is possible to effectively reduce costs.
【００１３】一方、新たな粉体状凝集剤の簡便且つ安定
的な供給を図るためには、粉体供給機によって混合槽へ
連続的に定量供給するようにしていることも有効であ
る。On the other hand, in order to easily and stably supply a new powdery flocculant, it is also effective to continuously supply a fixed amount of the powdery coagulant to the mixing tank by a powder feeder.
【００１４】また、混合層に注入した原水と粉体状凝集
剤或いはスラッジを均一に混合し、吸着反応をより有効
に促進するためには、撹拌器を設けていることが望まし
い。Further, in order to uniformly mix the raw water injected into the mixed layer with the powdery coagulant or sludge to promote the adsorption reaction more effectively, it is desirable to provide a stirrer.
【００１５】さらに、金属イオンとスラッジ及び未反応
の粉体状凝集剤との反応効率をより向上するためには、
返送経路に遠心分離機を設け、スラッジをその軽重によ
って返送するものと排出するものとに分離するようにす
ることも有効である。Furthermore, in order to further improve the reaction efficiency of the metal ions with the sludge and the unreacted powdery flocculant,
It is also effective to install a centrifuge in the return path so that the sludge can be separated into those to be returned and those to be discharged by its light weight.
【００１６】[0016]
【実施例】以下、本発明の一実施例を、図面を参照して
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１７】図１に模式的に示すこの実施例の水質浄化
装置は、ダム工事現場で生じた原水Ｗｘを集める原水槽
１と、原水槽１から送られた原水Ｗｘと粉体状凝集剤Ａ
とを混合する混合槽２と、混合槽２から送られる混合物
Ｙを原水Ｗｘ中に含まれる金属イオンを吸着し凝集した
粉体状凝集剤ＡのスラッジＡｘと金属イオンを除去され
た浄水Ｗとに分離する沈殿槽３とを、原水Ｗｘの処理工
程の上流側から順に並べてなるもので、各槽は、配管
５、６を介して連通されており、水中ポンプ（図中Ｐで
示す）によって前記原水Ｗｘや混合物Ｙを次の槽に汲み
出すようにしている。混合槽２の上方には、前記粉体状
凝集剤Ａを混合槽２に投入するための粉体供給機４を設
置しており、粉体状凝集剤Ａを所定量で連続供給できる
ようにしている。また、混合槽２の内部には、原水槽１
から送られた原水Ｗｘと粉体状凝集剤とＡを略均一に混
合するために、撹拌器９を配置している。The water purification apparatus of this embodiment, which is schematically shown in FIG. 1, has a raw water tank 1 for collecting raw water Wx produced at a dam construction site, a raw water Wx sent from the raw water tank 1 and a powdery coagulant A.
And a sludge Ax of a powdery coagulant A obtained by adsorbing and aggregating a metal ion contained in the raw water Wx with a mixture Y sent from the mixing tank 2 and purified water W from which the metal ion is removed. And a settling tank 3 to be separated into two in order from the upstream side of the treatment step of the raw water Wx, and each tank is connected via pipes 5 and 6, and is connected by a submersible pump (indicated by P in the figure). The raw water Wx and the mixture Y are pumped out to the next tank. A powder feeder 4 for charging the powdery flocculant A into the mixing tank 2 is installed above the mixing tank 2 so that the powdery flocculant A can be continuously supplied in a predetermined amount. ing. In addition, inside the mixing tank 2, the raw water tank 1
The stirrer 9 is arranged in order to mix the raw water Wx sent from the powdery coagulant and A substantially uniformly.
【００１８】しかして、本実施例では、沈殿槽３の底部
に、原水Ｗｘ中に含まれる金属イオンを吸着した粉体状
凝集剤ＡのスラッジＡｘを引き抜き排出するための配管
８と、スラッジＡｘを混合槽２に返送するための返送経
路となる配管７を設けている。なお、この返送は、図示
しないポンプによって駆動されている。返送用の配管７
から混合槽２に戻されたスラッジＡｘは、原水Ｗｘ及び
新たに添加される粉体状凝集剤Ａと共に混合槽２内で均
一に撹拌され、混合されることとなる。In this embodiment, however, a pipe 8 for extracting and discharging sludge Ax of the powdery coagulant A which has adsorbed the metal ions contained in the raw water Wx is provided at the bottom of the settling tank 3 and the sludge Ax. A pipe 7 is provided as a return path for returning the water to the mixing tank 2. The return is driven by a pump (not shown). Piping for return 7
The sludge Ax returned from the mixing tank 2 to the mixing tank 2 is uniformly stirred and mixed with the raw water Wx and the newly added powdery coagulant A in the mixing tank 2.
【００１９】本実施例では、市販の粉体状凝集剤Ａとし
て、スーパーナミットＴＮ３１５ＣＹ（ノアテック社
製）を使用している。このものは、可溶性のアルミニウ
ム化合物、可溶性の鉄塩化物及び高分子凝集剤又はこれ
らに可溶性の還元剤を添加したもの等を凝集主剤とし、
これにその凝集主剤の水溶液がｐＨ値で中性付近を示す
程度にアルカリ金属或いはアルカリ土類金属の炭酸塩及
びセメント粉粒体の少なくとも一つを配合し、さらに土
壌鉱物系粉粒体の少なくとも一種を配合してなるものと
して知られており、具体的には、組成元素を酸化物換算
表記において、ＳｉＯ2を約５５％、Ａｌ2Ｏ3を約９
％、Ｋ2Ｏを約２％、Ｎａ2Ｏを約３％、Ｆｅ2Ｏ3を約１
７％、ＳＯ3を約１０％、ＣａＯを約１％含有し、その
他に炭素（Ｃ）を約１．９％含有している。このような
組成において、このスーパーナミットＴＮ３１５ＣＹ
は、水に含まれる六価クロムを特に良く吸着し、六価ク
ロムを吸着し凝集た状態でも、沈殿槽３においてかき混
ぜれば柔らかいスラッジＡｘとして沈殿し、容易に排出
できるという性質を有している。なお、スーパーナミッ
トは、前記組成比を変化させることによって、六価クロ
ム以外の重金属イオンや、鉄イオン等の他の金属イオン
を特異的に吸着することができるものである。In this embodiment, as the commercially available powdery flocculant A, Super Namit TN315CY (manufactured by Noah Tech) is used. This is a soluble aluminum compound, a soluble iron chloride and a polymer flocculant or those obtained by adding a soluble reducing agent to the coagulant main agent,
To this, at least one of alkali metal or alkaline earth metal carbonate and cement powder is blended to such an extent that the aqueous solution of the coagulant main agent shows a neutral pH value, and at least soil mineral powder It is known as a mixture of one kind, and specifically, in terms of oxide composition, the composition elements are about 55% of SiO 2 and about 9% of Al 2 O 3.
%, K 2 O about 2%, Na 2 O about 3%, Fe 2 O 3 about 1%
7%, SO 3 about 10%, CaO about 1% and carbon (C) about 1.9%. In such a composition, this Super Namit TN315CY
Has a property of adsorbing hexavalent chromium contained in water particularly well, and even in a state where hexavalent chromium is adsorbed and aggregated, it is precipitated as soft sludge Ax by stirring in the settling tank 3 and can be easily discharged. There is. In addition, the super-namites are capable of specifically adsorbing heavy metal ions other than hexavalent chromium and other metal ions such as iron ions by changing the composition ratio.
【００２０】ここで、本実施例の試験に先立って、比較
試験として、従来のようにこのスーパーナミットＴＮ３
１５ＣＹを用いた原水Ｗｘの六価クロム除去処理を行っ
た。原水Ｗｘとしては、ダム工事現場で排出される水を
用い、粉体供給機４からスーパーナミットＴＮ３１５Ｃ
Ｙを一度だけ投入して、返送用の配管７を閉じて沈殿槽
３から排出用の配管８を通じてスラッジＡｘを引き抜く
とともに、沈殿槽３から上澄みとして溢れ出す浄水Ｗの
含六価クロム値を測定した。その結果、原水Ｗｘ１m3中
に六価クロム約１ｍｇ（約１ｐｐｍ）を含有していたと
ころ、スーパーナミットＴＮ３１５ＣＹを約５００ｇ
（約５００ｐｐｍ）を添加することによって、浄水Ｗ中
に含まれる六価クロム濃度を０．０１ｐｐｍ以下にまで
低下させることができた。この値は、現在の排出基準値
を十分に下回るものである。なお、浄水Ｗの濁度は原水
Ｗｘのそれよりも相当程度改善されていた。また、配管
８から引き抜いたスラッジＡｘについて調べたところ、
スーパーナミットＴＮ３１５ＣＹは、六価クロムに対す
る総吸着能力のうち、約３０％のみが使用されており、
約７０％の吸着能力を残存していることが判明した。Here, prior to the test of this embodiment, as a comparative test, this Super Namit TN3 was used as in the conventional case.
Hexavalent chromium removal treatment of raw water Wx using 15CY was performed. As the raw water Wx, the water discharged from the dam construction site is used, and the powder feeder 4 is used to feed the Super Namit TN315C.
Y is charged only once, the return pipe 7 is closed, the sludge Ax is drawn out from the settling tank 3 through the discharge pipe 8, and the hexavalent chromium value of the purified water W overflowing from the settling tank 3 as a supernatant liquid is measured. did. As a result, when the raw water Wx1 m 3 contained about 1 mg (about 1 ppm) of hexavalent chromium, about 500 g of Super Namit TN315CY was found.
By adding (about 500 ppm), the concentration of hexavalent chromium contained in the purified water W could be reduced to 0.01 ppm or less. This value is well below current emission standards. The turbidity of the purified water W was considerably improved as compared with that of the raw water Wx. Moreover, when the sludge Ax extracted from the pipe 8 was examined,
Super Namit TN315CY uses only about 30% of the total adsorption capacity for hexavalent chromium.
It was found that the adsorption capacity of about 70% remained.
【００２１】次に、本実施例の原水処理試験において
は、前記と同一の原水Ｗｘを用い、粉体供給機４から新
たに投入するスーパーナミットＴＮ３１５ＣＹの量を、
原水Ｗｘ１m3当り約１００ｇ（約１００ｐｐｍ）とし、
原水Ｗｘの処理工程中、排出用の配管８を閉じてスラッ
ジＡｘを返送用の配管７を通じて連続的に混合槽２へ返
送した。そして、沈殿槽３から溢れ出した浄水Ｗについ
て、前記比較試験と同様にして六価クロム濃度を調べた
ところ０．０１ｐｐｍ以下であり、濁度も比較試験と同
程度に改善されていた。この結果から、原水Ｗｘの処理
にあたって新規に添加するスーパーナミットＴＮ３１５
ＣＹの量を前記比較試験の約１／５まで低減することが
でき、それに伴って大幅なコストダウンを実現すること
が可能となった。Next, in the raw water treatment test of this example, the same raw water Wx as described above was used, and the amount of Super Namit TN315CY newly charged from the powder feeder 4 was changed to
About 100 g (about 100 ppm) per raw water Wx1 m 3 ,
During the process of treating the raw water Wx, the discharge pipe 8 was closed and the sludge Ax was continuously returned to the mixing tank 2 through the return pipe 7. Then, the purified water W overflowing from the settling tank 3 was examined for the hexavalent chromium concentration in the same manner as in the comparative test, and it was 0.01 ppm or less, and the turbidity was also improved to the same extent as in the comparative test. From this result, Super Namit TN315 newly added in the treatment of raw water Wx
The amount of CY can be reduced to about 1/5 of that of the comparative test, and accordingly, it is possible to realize a significant cost reduction.
【００２２】以上のことから、本実施例の水質浄化装置
は、原水中の六価クロムを既に吸着し凝集した粉体状凝
集剤ＡであるスーパーナミットＴＮ３１５ＣＹのスラッ
ジＡｘを、沈殿槽３から混合槽２に連通する返送経路た
る配管７を通じて返送するという極めて簡単な構成を有
している。したがって、未だ六価クロムに対する吸着力
を残存しているスーパーナミットＴＮ３１５ＣＹのスラ
ッジＡｘを有効に利用して、新たに添加すべきスーパー
ナミットＴＮ３１５ＣＹの量を低減し、コストダウンを
有効に図ることができる、簡単で極めて優れた水質浄化
装置を構成するものである。From the above, in the water purification apparatus of this embodiment, the sludge Ax of Super Namit TN315CY, which is the powdery coagulant A that has already adsorbed and coagulated hexavalent chromium in the raw water, is removed from the settling tank 3. It has an extremely simple structure in which the material is returned through a pipe 7 which is a return path communicating with the mixing tank 2. Therefore, it is possible to effectively utilize the sludge Ax of Super Namit TN315CY, which still retains the adsorptive power to hexavalent chromium, to reduce the amount of Super Namit TN315CY to be newly added, and to effectively reduce the cost. It constitutes a simple and extremely excellent water purification device capable of performing.
【００２３】特に、粉体状凝集剤Ａとしてスーパーナミ
ットＴＮ３１５ＣＹを使用しているので、高性能ゆえに
価格が高く実用に向かなかったという不具合を有効に解
消することができる。In particular, since Super-Namit TN315CY is used as the powdery flocculant A, it is possible to effectively eliminate the disadvantage that it is expensive and not suitable for practical use due to its high performance.
【００２４】また、このスーパーナミットＴＮ３１５Ｃ
Ｙは、原水Ｗｘ中の金属イオンとして六価クロムを対象
として吸着し凝集するものであるので、本実施例によれ
ば、排出基準が特に厳しい六価クロムを、少量のスーパ
ーナミットＴＮ３１５ＣＹで短時間に確実に除去するこ
とができ、非常に有用である。In addition, this Super Namit TN315C
Since Y adsorbs hexavalent chromium as a metal ion in the raw water Wx and agglomerates it, according to the present embodiment, hexavalent chromium whose emission standard is particularly strict is reduced with a small amount of Super Namit TN315CY. It can be removed reliably in time and is very useful.
【００２５】さらに、原水Ｗｘを処理中、スラッジＡｘ
を原水Ｗｘへ連続的に添加するようにしており、また、
新たなスーパーナミットＴＮ３１５ＣＹを、粉体供給４
機によって混合槽２へ連続的に定量供給し、さらには、
混合層２に撹拌器９を設けているので、新たなスーパー
ナミットＴＮ３１５ＣＹや使用済でありながら六価クロ
ムに対して吸着能力を失っていないスラッジＡｘと原水
Ｗｘ中の六価クロムとの反応効率を促進し、スーパーナ
ミットＴＮ３１５ＣＹの添加量を有効に低減することが
可能である。Further, during treatment of raw water Wx, sludge Ax
Is continuously added to the raw water Wx, and
New Super Namit TN315CY powder supply 4
Continuously supplies a fixed amount to the mixing tank 2 by a machine,
Since the agitator 9 is provided in the mixing layer 2, the reaction between the new Super Namit TN315CY and sludge Ax which has already been used but has not lost the adsorption capacity for hexavalent chromium and hexavalent chromium in the raw water Wx. It is possible to promote efficiency and effectively reduce the addition amount of Super Namit TN315CY.
【００２６】なお、粉体状凝集剤は、スーパーナミット
ＴＮ３１５ＣＹやその組成比を変更したものに限らず、
種々のものを適用してもよい。また、返送経路の途中に
サイクロン方式の遠心分離機を設け、スラッジをその軽
重によって反応槽に返送するものと排出するものとに分
離するようにしてもよい。さらに、返送経路は、混合槽
にスラッジを直接投入する以外にも、沈殿槽と混合槽よ
りも上流側の配管に連通させたものや、混合槽よりも下
流側において混合槽と沈殿槽との間の配管に連通させた
ものでもよい。その他、各部の具体的構成は、上記実施
例に限られるものではなく、本発明の趣旨を逸脱しない
範囲で種々変形が可能である。The powdery flocculant is not limited to Super Namit TN315CY or its composition ratio changed,
Various types may be applied. Further, a cyclone type centrifugal separator may be provided in the middle of the return path to separate the sludge into the one to be returned to the reaction tank and the one to be discharged by the weight of the sludge. Further, the return route is not limited to directly introducing the sludge into the mixing tank, but is also connected to the settling tank and a pipe upstream from the mixing tank, or to the mixing tank and the precipitation tank downstream from the mixing tank. It may be connected to a pipe between them. In addition, the specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
【００２７】[0027]
【発明の効果】本発明は、以上説明したような形態で実
施され、以下に記載されるような効果を奏する。The present invention is carried out in the form as described above, and has the following effects.
【００２８】すなわち、本発明の水質浄化装置は、金属
イオンを含有する原水とその金属イオンを吸着し凝集さ
せる粉体状凝集剤と混合槽において混合し、その混合槽
から送られる混合液を沈殿槽において金属イオンを吸着
した粉体状凝集剤のスラッジと金属イオンを除去した浄
水とに分離するようにするとともに、沈殿槽に集められ
たスラッジを、沈殿槽から反応槽側に向けて設けた返送
経路を通じて原水に新たな粉体状凝集剤と共に添加する
ように構成している。したがって、原水処理の一工程で
は未だ金属イオンに対する吸着能力を使い尽くしていな
い粉体状凝集剤のスラッジを有効に利用して、原水中の
金属イオンをさらに吸着させることによって、金属イオ
ンを十分に除去した浄水を得ながら、新たに添加する粉
体状凝集剤の量を減らしてコストダウンを有効に図るこ
とが可能である。また、廃棄処分すべきスラッジの量の
削減も可能となるので、その面でもコストダウンを図り
つつ、地球環境の保全にも寄与することができる。That is, in the water purification apparatus of the present invention, raw water containing metal ions and a powdery coagulant for adsorbing and coagulating the metal ions are mixed in a mixing tank, and the mixed solution sent from the mixing tank is precipitated. In the tank, the sludge of the powdery flocculant that adsorbed the metal ions and the purified water from which the metal ions were removed were separated, and the sludge collected in the settling tank was provided from the settling tank toward the reaction tank side. It is configured to be added to the raw water together with a new powdery flocculant through the return route. Therefore, in one step of the raw water treatment, the sludge of the powdery flocculant, which has not yet exhausted its adsorption ability for metal ions, is effectively utilized to further adsorb the metal ions in the raw water, thereby sufficiently absorbing the metal ions. While obtaining the removed purified water, it is possible to effectively reduce the cost by reducing the amount of the powdery coagulant newly added. In addition, since it is possible to reduce the amount of sludge to be disposed of, it is possible to contribute to the preservation of the global environment while reducing costs in that respect as well.
【００２９】特に粉体状凝集剤として、可溶性のアルミ
ニウム化合物、可溶性の鉄塩化物及び高分子凝集剤又は
これらに可溶性の還元剤を添加したもの等を凝集主剤と
し、これにその凝集主剤の水溶液がｐＨ値で中性付近を
示す程度にアルカリ金属或いはアルカリ土類金属の炭酸
塩及びセメント粉粒体の少なくとも一つを配合し、さら
に土壌鉱物系粉粒体の少なくとも一種を配合してなる、
例えば市販のノアテック社製のスーパーナミット等を利
用した場合には、金属イオンを短時間で良好に除去し、
その使用に要するコストを有効に低減することができ
る。In particular, as the powdery aggregating agent, a soluble aluminum compound, a soluble iron chloride and a polymer aggregating agent, or those obtained by adding a soluble reducing agent to these are used as an aggregating agent, and an aqueous solution of the aggregating agent is added thereto. Is mixed with at least one of alkali metal or alkaline earth metal carbonate and cement powder to the extent that the pH value is near neutral, and further contains at least one kind of soil mineral powder.
For example, in the case of using a commercially available Noatech Super Namitte, etc., the metal ions are removed well in a short time,
The cost required for its use can be effectively reduced.
【００３０】また、金属イオンとして特に排出基準値が
厳しい六価クロムを対象として吸着し凝集する粉体状凝
集剤を使用する場合には、大量の廃水が生じるダムやト
ンネル等の土木建築現場や生コン現場等での原水の処理
を有効に行うことができる。When a powdery coagulant that adsorbs and coagulates hexavalent chromium, which has a particularly strict emission standard value, is used as a metal ion, when a large amount of wastewater is generated, a construction site such as a dam or a tunnel is used. It is possible to effectively treat raw water at raw concrete sites.
【００３１】さらに、原水の処理中、スラッジを原水へ
連続的に添加するようにすれば、既に金属イオンを吸着
していながらまだその吸着力を失っていない粉体状凝集
剤の有効利用を促進しつつ新たな粉体状凝集剤の添加量
を低く抑えて、コストダウンを有効に図ることが可能で
ある。一方、粉体供給機によって混合槽へ連続的に定量
供給するようにしても、新たな粉体状凝集剤の簡便且つ
安定的に供給しつつ、そのコストダウンを図ることがで
きる。Furthermore, if the sludge is continuously added to the raw water during the treatment of the raw water, the effective utilization of the powdery flocculant which has already adsorbed the metal ions but has not lost its adsorptive power is promoted. At the same time, it is possible to effectively reduce the cost by suppressing the addition amount of the new powdery coagulant to be low. On the other hand, even if the powder feeder continuously supplies a fixed amount to the mixing tank, it is possible to easily and stably supply the new powdery flocculant and to reduce the cost thereof.
【００３２】また、混合槽に撹拌器を設ければ、混合層
に注入した原水と粉体状凝集剤或いはスラッジを均一に
混合し、その吸着反応を有効に促進することができる。If a stirrer is provided in the mixing tank, the raw water injected into the mixing layer can be uniformly mixed with the powdery coagulant or sludge, and the adsorption reaction can be effectively promoted.
【００３３】さらに、返送経路に遠心分離機を設け、ス
ラッジをその軽重によって返送するものと排出するもの
とに分離すると、金属イオンとスラッジ及び未反応の粉
体状凝集剤との反応効率をより向上することができる。Further, if a centrifuge is provided in the return path and the sludge is separated into those to be returned and those to be discharged by its light weight, the reaction efficiency between the metal ions, the sludge and the unreacted powdery flocculant is further improved. Can be improved.
【図１】本発明の一実施例を示す模式図。FIG. 1 is a schematic diagram showing an embodiment of the present invention.
２…混合槽 ３…沈殿槽 ７…返送経路 ９…撹拌器 Ａ…粉体状凝集剤 Ａｘ…スラッジ Ｗ…浄水 Ｗｘ…原水 2 ... Mixing tank 3 ... Settling tank 7 ... Return route 9 ... Stirrer A ... Powdered coagulant Ax ... sludge W ... Purified water Wx ... raw water
───────────────────────────────────────────────────── フロントページの続き (72)発明者 沖原 正 大阪市東淀川区小松３−４−１−815 (56)参考文献 特開 平７−214073（ＪＰ，Ａ) 特開 平７−136661（ＪＰ，Ａ) 特開 平４−267994（ＪＰ，Ａ) 特開 平７−136669（ＪＰ，Ａ) 特開 昭53−84355（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 1/52 - 1/56 C02F 1/62 B01D 21/00 - 21/34 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadashi Okihara 3-4-1-815 Komatsu, Higashiyodogawa-ku, Osaka (56) Reference JP-A-7-214073 (JP, A) JP-A-7-136661 (JP , A) JP 4-267994 (JP, A) JP 7-136669 (JP, A) JP 53-84355 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB) Name) C02F 1/52-1/56 C02F 1/62 B01D 21/00-21/34
Claims (6)
ンを吸着し凝集させる粉体状凝集剤とを混合する混合
槽、及び、混合槽から送られる混合液を金属イオンを吸
着した粉体状凝集剤のスラッジと金属イオンを除去した
浄水とに分離する沈殿槽を、原水の処理工程の上流側か
ら順に備えたものにおいて、 沈殿槽から反応槽側に向けて返送経路を設け、沈殿槽に
集められたスラッジを、この返送経路を通じて返送し原
水に新たな粉体状凝集剤と共に添加するように構成し、
粉体状凝集剤として、可溶性のアルミニウム化合物、可
溶性の鉄塩化物及び高分子凝集剤又はこれらに可溶性の
還元剤を添加したもの等を凝集主剤とし、これにその凝
集主剤の水溶液がｐＨ値で中性付近を示す程度にアルカ
リ金属或いはアルカリ土類金属の炭酸塩及びセメント粉
粒体の少なくとも一つを配合し、さらに土壌鉱物系粉粒
体の少なくとも一種を配合してなるものを適用している
ことを特徴とする水質浄化装置。1. A mixing tank for mixing raw water containing metal ions with a powdery aggregating agent for adsorbing and aggregating the metal ions, and a mixed liquid sent from the mixing tank in the form of powder adsorbing the metal ions. A settling tank that separates the sludge of coagulant and purified water from which metal ions have been removed is provided in order from the upstream side of the treatment process of the raw water. The sludge collected is returned through this return route and added to the raw water together with a new powdery flocculant ,
As a powdery coagulant, soluble aluminum compounds,
Soluble iron chloride and polymeric flocculants or soluble in these
A coagulant base agent, such as one with a reducing agent added,
The pH of the aqueous solution of the main agent is about neutral to pH
Carbonate and cement powder of remetal or alkaline earth metal
Incorporating at least one of the granules, and further soil mineral powder
A water purification device, characterized in that it is a mixture of at least one type of body .
ロムを対象として吸着し凝集するものであることを特徴
とする請求項１記載の水質浄化装置。2. A powdery flocculant containing hexavalent chromium as metal ions.
Characterized by the fact that ROM is adsorbed and aggregated
The water purification apparatus according to claim 1 .
水へ連続的に添加するようにしていることを特徴とする
請求項１又は２記載の水質浄化装置。3. The sludge is treated as raw material while treating the raw water.
Characterized by being continuously added to water
The water purification device according to claim 1 .
て混合槽へ連続的に定量供給するようにしていることを
特徴とする請求項１、２又は３記載の水質浄化装置。4. A new powder coagulant is added by a powder feeder.
That the constant amount is continuously supplied to the mixing tank.
The water purification device according to claim 1, 2 or 3 .
とする請求項１、２、３又は４記載の水質浄化装置。5. A stirrer is provided in the mixing layer.
The water purification apparatus according to claim 1, 2, 3, or 4 .
その軽重によって返送するものと排出するものとに分離
するようにしていることを特徴とする請求項１、２、
３、４又は５記載の水質浄化装置。6. A centrifuge is provided in the return path to remove sludge.
Separation of returned items and discharged items by their light weight
Claims 1 and 2, characterized in that
The water purification device according to 3, 4, or 5 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000034780A JP3387038B2 (en) | 2000-02-14 | 2000-02-14 | Water purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000034780A JP3387038B2 (en) | 2000-02-14 | 2000-02-14 | Water purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001219175A JP2001219175A (en) | 2001-08-14 |
| JP3387038B2 true JP3387038B2 (en) | 2003-03-17 |
Family
ID=18559069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000034780A Expired - Fee Related JP3387038B2 (en) | 2000-02-14 | 2000-02-14 | Water purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3387038B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006058107A (en) * | 2004-08-19 | 2006-03-02 | Atox Co Ltd | Method for treating chromate liquid waste containing radioactive substance |
| JP4806426B2 (en) * | 2008-03-18 | 2011-11-02 | 日本碍子株式会社 | Method and apparatus for detoxifying heavy metal ions simultaneously with inorganic suspended particles |
-
2000
- 2000-02-14 JP JP2000034780A patent/JP3387038B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001219175A (en) | 2001-08-14 |
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