JP3925122B2 - Jellyfish processing method - Google Patents
Jellyfish processing method Download PDFInfo
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- JP3925122B2 JP3925122B2 JP2001225841A JP2001225841A JP3925122B2 JP 3925122 B2 JP3925122 B2 JP 3925122B2 JP 2001225841 A JP2001225841 A JP 2001225841A JP 2001225841 A JP2001225841 A JP 2001225841A JP 3925122 B2 JP3925122 B2 JP 3925122B2
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- jellyfish
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- 241000242583 Scyphozoa Species 0.000 title claims description 44
- 238000003672 processing method Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000000926 separation method Methods 0.000 claims description 32
- 229940037003 alum Drugs 0.000 claims description 26
- 239000006260 foam Substances 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 239000007800 oxidant agent Substances 0.000 claims description 18
- 238000005345 coagulation Methods 0.000 claims description 13
- 230000015271 coagulation Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 230000002776 aggregation Effects 0.000 claims description 8
- 239000000460 chlorine Substances 0.000 claims description 5
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- 230000004931 aggregating effect Effects 0.000 claims description 4
- 238000004220 aggregation Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 claims description 2
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- 239000003795 chemical substances by application Substances 0.000 claims 1
- 125000001309 chloro group Chemical group Cl* 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 6
- 235000011126 aluminium potassium sulphate Nutrition 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
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- 235000019645 odor Nutrition 0.000 description 5
- 229940050271 potassium alum Drugs 0.000 description 5
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 5
- 239000013535 sea water Substances 0.000 description 5
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- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
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- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
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- 102000004169 proteins and genes Human genes 0.000 description 2
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
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- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- BPLYVSYSBPLDOA-GYOJGHLZSA-N n-[(2r,3r)-1,3-dihydroxyoctadecan-2-yl]tetracosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCCCC(=O)N[C@H](CO)[C@H](O)CCCCCCCCCCCCCCC BPLYVSYSBPLDOA-GYOJGHLZSA-N 0.000 description 1
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- Physical Water Treatments (AREA)
- Treatment Of Sludge (AREA)
- Water Treatment By Sorption (AREA)
- Processing Of Solid Wastes (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、くらげの処理方法に係り、特に、工業用冷却水等を採水する海水水路で回収されたくらげを効率的に処理する方法に関する。
【０００２】
【従来の技術】
発電所、化学コンビナート、製鉄所等のプラントでは、海水が工業用冷却水として大量に使用されているが、この海水の採水のための海水水路には大量のくらげや海水藻などの浮遊性海棲生物が押し寄せる。このくらげ等の浮遊性海棲生物を放置すると、配管閉塞、海水採水量の低下、冷却効率の低下、ひいては装置故障、発電装置等の装置稼動効率の低下等の様々な障害を引き起こすため、取水路入り口にスクリーンを設け、押し寄せたくらげ等をかき揚げて回収し、処分している。特に、くらげは夏場に異常繁殖し、取水口のスクリーンによって１日に数十トンも捕捉される。
【０００３】
従来、滓渣としてのくらげ等は地面に掘った穴に放置されていたが、夏場には量が多いことも相俟って、魚の腐敗したような臭気の発生や、投棄箇所からの汚水の流出といった環境汚染の問題があり、更に投棄場所の確保、投棄場所への運搬コスト等も大きな問題となっていた。
【０００４】
回収したくらげを破砕処理して固形分と水分とに分離して処理する方法として、特公平１−３１３４３号公報には、くらげを破砕して脱水し、脱水濾液を次亜塩素酸ナトリウムによって酸化し、次いで凝集分離処理し、その後、活性炭処理する方法が記載されている。
【０００５】
【発明が解決しようとする課題】
上記特公平１−３１３４７号公報の方法では、破砕した海棲生物が腐敗して臭気を発生させ易い。また、浄化処理する液体のＣＯＤ負荷が高く、最終処理水のＣＯＤがやや高いものとなる。
【０００６】
本発明は上記従来の問題点を解決し、くらげを処理する際の腐敗臭を低減することができ、またくらげの処理により発生する廃液のＣＯＤを十分に低下させるように処理することも可能な処理方法を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明のくらげの処理方法は、くらげを破砕して破砕物含有水とする工程と、この破砕物含有水にミョウバン及び酸化剤を添加する工程と、次いで凝集剤を添加して凝集分離処理する工程と、この凝集分離処理により得られた分離水を浄化する浄化工程とを有することを特徴とするものである。
【０００８】
かかる本発明のくらげの処理方法によると、くらげの破砕物含有水にミョウバンを添加するので、このミョウバンの腐敗防止作用によりくらげ破砕物含有水からの臭気発生が抑制される。
【０００９】
このミョウバンは、泡沫固化作用も有するので、泡沫分が凝集分離工程において除去され易くなる。即ち、ミョウバンをくらげ破砕物含有水に添加することにより、破砕物含有水中のタンパク質が凝固する。このため、タンパク等が凝集分離工程において十分に分離、除去され、その後の浄化処理工程でのＣＯＤ負荷が低減され、最終処理水のＣＯＤを低下させることができる。
【００１０】
なお、本発明では、ミョウバンを添加した後、凝集分離に先立って泡沫を分離しても良い。このようにすれば、凝集剤の使用量を低減したり、泡沫分以外の懸濁物質の凝集分離を効率良く行うことも可能となる。
【００１１】
本発明では、凝集分離後の分離水は、濾過し、得られた濾過処理水を活性炭で処理することにより浄化することが好ましい。
【００１２】
【発明の実施の形態】
以下に図面を参照して本発明の実施の形態を詳細に説明する。
【００１３】
図１は本発明のくらげの処理方法の実施の形態を示す系統図である。
【００１４】
取水路に押し寄せ、入り口のバースクリーン等に引っかかって回収されたくらげは、くらげ貯留槽１に貯留される。このくらげを、まずくらげ破砕手段２で破砕する。くらげを破砕することにより、くらげ含有水が得られる。この場合、貯留槽１に貯留されたくらげをミキサーなどの破砕機に移送して破砕しても良いが、貯留槽１から後段の泡沫分離槽３に移送する移送路に回転刃のついた破砕ポンプを設け、破砕しながら移送するようにしてもよい。このように破砕ポンプを用いると、くらげ含有水を一定流速で移送できる。
【００１５】
この実施の形態では、このくらげ破砕物含有水に酸化剤及びミョウバンを添加した後、泡沫分離槽３に導入する。
【００１６】
酸化剤としては、塩素系酸化剤（例えば、次亜塩素酸ナトリウムなどの次亜塩素酸塩、過塩素酸ナトリウム等の過塩素酸塩など）、過酸化水素、気体酸素が好適である。気体酸素は、例えば空気曝気によってくらげ破砕物含有水に添加することができる。塩素系酸化剤の場合、添加量は１００〜５０００ｍｇ／Ｌ程度が好適である。過酸化水素の場合、添加量は３０〜３０００ｍｇ／Ｌ程度が好適である。空気曝気の場合、１Ｌの水に対し１〜２０Ｌ／ｍｉｎの割合で空気を供給するのが好ましい。
【００１７】
ミョウバンとしては、具体的には、硫酸アルミニウム（Ａｌ２（ＳＯ４）３）と他の物質との複合塩を用いることができ、複合塩としては、硫酸アルミニウムカリウムＡｌＫ（ＳＯ４）２（カリウムミョウバン）、硫酸アルミニウムナトリウムＡｌＮａ（ＳＯ４）２（ナトリウムミョウバン）等が挙げられる。これらのミョウバンは１種を単独で用いても２種以上を併用しても良い。ミョウバンとしては、特に、泡沫固化効果、腐敗臭防止効果に優れることから、カリウムミョウバンを用いるのが好ましい。
【００１８】
このミョウバンの添加量は、くらげ含有水に対して好ましくは５０〜５０００ｍｇ／Ｌ、特に好ましくは５００〜２０００ｍｇ／Ｌ程度であり、例えば、カリウムミョウバンの１０重量％水溶液として５０００〜２００００ｍｇ／Ｌ程度添加するのが好ましい。
【００１９】
酸化剤及びミョウバンの添加が行われたくらげ破砕物含有水は、泡沫分離槽３にて、ミョウバンにより凝固させた泡沫分と、液状分とに分離する。この泡沫分離槽３としては、例えば、泡沫分をレーキなどで掻き取って分離するものなどを用いることができる。
【００２０】
この泡沫分離槽３で分離された泡沫分は、後述の凝集分離槽４の凝集汚泥と共に、凝集剤として高分子凝集剤を好ましくは５〜１００ｍｇ／Ｌ好ましくは２０〜５０ｍｇ／Ｌ程度添加して、フィルタプレス、ベルトプレス、遠心脱水機などの脱水機７で脱水処理する。脱水により得られた脱水濾液は上記液状分と混合して処理することが好ましい。脱水ケーキは埋立て、焼却などで処分される。
【００２１】
泡沫分離槽３からの液状分は、脱水機７の脱水濾液と共に凝集分離槽４に移送し、凝集剤を添加して凝集分離する。
【００２２】
ここで用いる凝集剤としては、塩化第二鉄、硫酸第二鉄などの鉄塩や、硫酸アルミニウム、ポリ塩化アルミニウム等の無機凝集剤が好適である。無機凝集剤の添加量は通常１０００〜１００００ｍｇ／Ｌ程度、例えば３８重量％の塩化第二鉄の場合で１０００〜５０００ｍｇ／Ｌ程度で十分である。
【００２３】
この凝集処理においては、凝集助剤としてアニオン系高分子凝集剤を併用添加するのが好ましく、その添加量は１〜２０ｍｇ／Ｌ、特に３〜１０ｍｇ／Ｌ程度とするのが好ましい。
【００２４】
この凝集分離槽４の形式としては特に制限はないが、くらげの凝集成分は軽くて浮上し易いので加圧浮上による凝集分離槽が好適である。ただし、凝集沈殿槽を用いても良い。凝集汚泥は好ましくは脱水機７により脱水後、埋め立て、乾燥、焼却などで処分する。凝集汚泥は泡沫分と混合して脱水機により脱水されても良い。脱水機としては、フィルタプレス、ベルトプレス、遠心脱水機など各種のものを用いることができる。脱水濾液は再度凝集分離槽４に戻すのが好ましい。
【００２５】
凝集分離槽４の分離水は、濾過器５で濾過した後、活性炭塔６で処理してＣＯＤを除去し、処理水は放流する。
【００２６】
なお、この分離水の浄化手段としては、凝集分離水中のＣＯＤを除去できるものであれば良く、図１のような、濾過器５と活性炭塔６との組み合わせの他、活性炭処理、生物処理、膜濾過処理等のようにＣＯＤの酸化分解や濾過、吸着処理を１又は２以上組み合わせたものを採用することができる。
【００２７】
上記の実施の形態では、酸化剤をミョウバンと略同時にくらげ破砕物含有水に添加しているが、酸化剤とミョウバンのいずれか一方を他方よりも先に添加してもよい。例えば、ミョウバンを添加し泡沫を分離した後に酸化剤を添加し、その後凝集分離処理を行っても良い。
【００２８】
上記の濾過又は活性炭処理後に、処理水を脱塩素処理してもよい。
【００２９】
上記実施の形態では、ミョウバンを添加した後、泡沫を分離しているが、泡沫を分離することなくそのまま凝集分離処理しても良い。
【００３０】
本発明においては、ミョウバン、酸化剤の添加工程後、引続き後工程を行うのが好ましいが、添加工程後１〜５日経過したのち、後工程（泡沫分離、凝集分離、濾過、活性炭処理など）を行ってもよい。酸化剤等の添加により腐敗を抑制し、臭気発生を防止するので後工程を遅らせても問題はない。処理装置の処理能力に比べてクラゲがかなり少ない場合、逆に処理能力に比べクラゲ量が多く処理し切れない場合、後日の処理にまわすことにより対応できる。
【００３１】
【実施例】
以下に実施例及び比較例を挙げて本発明をより具体的に説明する。
【００３２】
実施例１
図１に示すフローに従って、くらげを処理した。
【００３３】
貯留槽に貯留されたくらげを破砕ポンプで破砕し、酸化剤及びミョウバンを添加しながら泡沫分離槽３に導入し、泡沫を分離した。酸化剤としては、次亜塩素酸ナトリウムの有効塩素濃度１０％水溶液を１０００ｍｇ／Ｌ（有効塩素として１００ｍｇ／Ｌ）の割合にて添加した。ミョウバンとしては、カリウムミョウバンの１０重量％水溶液を５０００ｍｇ／Ｌ（カリウムミョウバン添加量５００ｍｇ／Ｌ）の割合にて添加した。次いで凝集分離槽４に導入し、３８重量％の塩化第二鉄水溶液２０００ｍｇ／Ｌとアニオン系高分子凝集剤４ｍｇ／Ｌを添加し、加圧浮上分離処理して凝集浮上汚泥と分離水を得た。この分離水を、上層がアンスラサイト、下層が砂からなる２層濾過器に下向流で通水した後、粒状活性炭を充填した活性炭塔に下向流通水し、処理水を得た。
【００３４】
なお、凝集分離汚泥は遠心脱水機で脱水処理し、脱水ケーキは廃棄し、脱水濾液は凝集分離槽４に戻した。
【００３５】
表１に破砕後のくらげ含有水と処理水のＣＯＤ濃度（ＣＯＤＭｎ）を示す。
【００３６】
比較例１
ミョウバンを添加しなかったこと以外は実施例１と同様の操作を行い、結果を表１に示した。
【００３７】
実施例２
酸化剤として空気中の酸素を利用するために空気を水１Ｌに対し２Ｌ／ｍｉｎの割合で散気管から吹き込んで曝気したこと以外は実施例１と同様の操作を行い、結果を表１に示した。
【００３８】
比較例２
ミョウバンを添加しなかったこと以外は実施例２と同様の操作を行い、結果を表１に示した。
【００３９】
実施例３
実施例１において、酸化剤として過酸化水素を５００ｍｇ／Ｌの割合で添加したこと以外は全く同様にして処理を行った。結果を表１に示す。
【００４０】
比較例３
ミョウバンを添加しなかったこと以外は実施例３と同様の操作を行い、結果を表１に示した。
【００４１】
実施例４
過酸化水素の添加量を１０００ｍｇ／Ｌとしたこと以外は実施例３と同様の操作を行い、結果を表１に示した。
【００４２】
比較例４
ミョウバンを添加しなかったこと以外は実施例４と同様の操作を行い、結果を表１に示した。
【００４３】
実施例５
次亜塩素酸ナトリウムの有効塩素濃度１０％水溶液の添加量を６００ｍｇ／Ｌとし、ミョウバン添加量を２５００ｍｇ／Ｌとしたこと以外は実施例１と同様の操作を行い、結果を表１に示した。
【００４４】
実施例６
過酸化水素の添加量を６００ｍｇ／Ｌとし、ミョウバン添加量を２５００ｍｇ／Ｌとしたこと以外は実施例１と同様の操作を行い、結果を表１に示した。
【００４５】
【表１】
表１より、本発明によれば、くらげの破砕処理に伴って生じる廃液を効率よく処理して良好な水質の処理水を得ることができることがわかる。
【００４７】
【発明の効果】
以上詳述した通り、本発明のくらげの処理方法によれば、くらげを減容化すると共に、減容化に伴って生じる廃液を十分に浄化処理することができる。
【図面の簡単な説明】
【図１】 本発明のくらげの処理方法の実施の形態を示す系統図である。
【符号の説明】
１ くらげ貯留槽
２ くらげ破砕手段
３ 凝集分離槽
４ 濾過器
５ 活性炭塔
６ 脱水機
７ 泡沫固化槽[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of treating saddle up, in particular, to a method of processing a recovered seawater waterway for water sampling the industrial cooling water or the like saddle up efficiently.
[0002]
[Prior art]
In plants such as power plants, chemical complexes, and steelworks, seawater is used in large quantities as industrial cooling water, but the seawater channel for sampling seawater has a large amount of floating properties such as jellyfish and seaweed. Marine life rushes. If these floating jellyfish and other floating marine organisms are left unattended, they will cause various obstacles such as pipe blockage, reduction in seawater sampling, cooling efficiency, equipment failure, and equipment operation efficiency such as power generation equipment. A screen is installed at the entrance of the road, and the jellyfish that have been pushed up are collected and disposed of. In particular, jellyfish breed abnormally in the summer, and dozens of tons are captured a day by the screen of the intake.
[0003]
Traditionally, jellyfish, etc., as a residue have been left in holes dug in the ground, but due to the large amount in summer, odors such as spoilage of fish and sewage from dumped places There was a problem of environmental pollution such as spillage, and the problem of securing the dumping site and the cost of transporting it to the dumping site was also a big problem.
[0004]
As a method of crushing the recovered jellyfish to separate it into solids and moisture, JP-B-1-33343 discloses that the jellyfish is crushed and dehydrated, and the dehydrated filtrate is oxidized with sodium hypochlorite. Then, a method of aggregating and separating, followed by activated carbon treatment is described.
[0005]
[Problems to be solved by the invention]
In the method disclosed in Japanese Patent Publication No. 1-331347, the crushed marine organisms are likely to rot and generate odor. Moreover, the COD load of the liquid to be purified is high and the COD of the final treated water is slightly high.
[0006]
The present invention is described above to solve the conventional problems, it is possible to reduce rancidity in processing saddled down, you are also possible to process so as to reduce sufficiently the COD of the waste liquid generated by the processing of jellyfish It is an object to provide a simple processing method.
[0007]
[Means for Solving the Problems]
The jellyfish processing method of the present invention includes a step of crushing a jellyfish to obtain crushed material-containing water, a step of adding alum and an oxidizing agent to the crushed material-containing water, and then adding a flocculant to agglomerate separation treatment. And a purification step for purifying the separated water obtained by the coagulation separation process.
[0008]
According to jellyfish processing method according the present invention, since the addition of alum to the crushed water containing jellyfish, odor development from jellyfish crushed-containing water is suppressed by anti-corruption action of the alum.
[0009]
Since this alum also has a foam solidifying action, the foam is easily removed in the coagulation separation step. That is, by adding alum to jellyfish crushed material-containing water, proteins in the crushed material-containing water coagulate. For this reason, protein etc. are fully separated and removed in the aggregation separation step, the COD load in the subsequent purification treatment step is reduced, and the COD of the final treated water can be lowered.
[0010]
In addition, in this invention, after adding alum, you may isolate | separate foam prior to aggregation separation. If it does in this way, it will also become possible to reduce the usage-amount of a coagulant | flocculant and to perform the aggregation separation of suspended substances other than a foam efficiently.
[0011]
In the present invention, it is preferable that the separated water after the coagulation and separation is filtered and purified by treating the obtained filtered water with activated carbon.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a system diagram showing an embodiment of the jellyfish processing method of the present invention .
[0014]
The jellyfish that has been pushed to the intake channel and caught by the bar screen or the like at the entrance is stored in the jellyfish storage tank 1. This jellyfish is first crushed by the jellyfish crushing means 2. By crushing the jellyfish, water containing jellyfish can be obtained. In this case, the jellyfish stored in the storage tank 1 may be transferred to a crusher such as a mixer for crushing, but the transfer path for transferring from the storage tank 1 to the subsequent foam separation tank 3 is crushed with a rotating blade. A pump may be provided and transferred while being crushed. If the crushing pump is used in this way, the jellyfish-containing water can be transferred at a constant flow rate.
[0015]
In this embodiment, after adding an oxidizing agent and alum to this jellyfish crushed material-containing water, it is introduced into the foam separation tank 3.
[0016]
As the oxidizing agent, a chlorine-based oxidizing agent (for example, a hypochlorite such as sodium hypochlorite, a perchlorate such as sodium perchlorate), hydrogen peroxide, or gaseous oxygen is suitable. Gaseous oxygen can be added to jellyfish crushed material-containing water, for example, by air aeration. In the case of a chlorine-based oxidizing agent, the amount added is preferably about 100 to 5000 mg / L. In the case of hydrogen peroxide, the addition amount is preferably about 30 to 3000 mg / L. In the case of air aeration, it is preferable to supply air at a rate of 1 to 20 L / min with respect to 1 L of water.
[0017]
As alum, specifically, a composite salt of aluminum sulfate (Al 2 (SO 4 ) 3 ) and another substance can be used. As the composite salt, aluminum sulfate potassium AlK (SO 4 ) 2 (potassium Alum), sodium aluminum sulfate AlNa (SO 4 ) 2 (sodium alum), and the like. These alums may be used alone or in combination of two or more. As alum, potassium alum is preferably used because it is particularly excellent in foam solidification effect and rot odor prevention effect.
[0018]
The addition amount of this alum is preferably about 50 to 5000 mg / L, particularly preferably about 500 to 2000 mg / L with respect to the jellyfish-containing water. For example, about 5000 to 20000 mg / L is added as a 10 wt% aqueous solution of potassium alum. It is preferable to do this.
[0019]
The jellyfish crushed material-containing water to which the oxidizing agent and alum have been added is separated into a foam component solidified by alum and a liquid component in the foam separation tank 3. As this foam separation tank 3, for example, one that scrapes and separates the foam with a rake or the like can be used.
[0020]
The foam separated in the foam separation tank 3 is added with a polymer flocculant, preferably about 5 to 100 mg / L, preferably about 20 to 50 mg / L as a flocculant together with agglomerated sludge in the agglomeration separation tank 4 described later. Then, dehydration is performed by a dehydrator 7 such as a filter press, a belt press, or a centrifugal dehydrator. The dehydrated filtrate obtained by dehydration is preferably mixed with the liquid component and treated. Dehydrated cake is disposed of by landfill or incineration.
[0021]
The liquid component from the foam separation tank 3 is transferred to the coagulation / separation tank 4 together with the dehydrated filtrate of the dehydrator 7 and added to the coagulant to be coagulated and separated.
[0022]
As the flocculant used here, iron salts such as ferric chloride and ferric sulfate, and inorganic flocculants such as aluminum sulfate and polyaluminum chloride are suitable. The amount of the inorganic flocculant added is usually about 1000 to 10000 mg / L, for example about 1000 to 5000 mg / L in the case of 38 wt% ferric chloride.
[0023]
In this agglomeration treatment, it is preferable to add an anionic polymer flocculant together as an agglomeration aid, and the addition amount is preferably about 1 to 20 mg / L, particularly about 3 to 10 mg / L.
[0024]
Although there is no restriction | limiting in particular as a form of this coagulation separation tank 4, Since the coagulation component of a jellyfish is light and it is easy to float, the coagulation separation tank by pressure flotation is suitable. However, a coagulation sedimentation tank may be used. The agglomerated sludge is preferably dehydrated by a dehydrator 7 and then disposed of by landfill, drying, incineration or the like. The agglomerated sludge may be mixed with foam and dehydrated by a dehydrator. As the dehydrator, various types such as a filter press, a belt press, and a centrifugal dehydrator can be used. The dehydrated filtrate is preferably returned to the flocculation separation tank 4 again.
[0025]
The separated water in the flocculation / separation tank 4 is filtered by the filter 5 and then treated by the activated carbon tower 6 to remove COD, and the treated water is discharged.
[0026]
The separation water purification means may be any means capable of removing COD in the coagulated separation water. In addition to the combination of the filter 5 and the activated carbon tower 6 as shown in FIG. 1, activated carbon treatment, biological treatment, A combination of one or more of COD oxidative decomposition, filtration, and adsorption treatment such as membrane filtration treatment may be employed.
[0027]
In the above embodiment, the oxidizing agent is added to the jellyfish crushed material-containing water almost simultaneously with the alum, but either the oxidizing agent or the alum may be added before the other. For example, after adding alum and separating foam, an oxidizing agent may be added, and then aggregating and separating treatment may be performed.
[0028]
The treated water may be dechlorinated after the above filtration or activated carbon treatment.
[0029]
In the above embodiment, the foam is separated after the alum is added, but the agglomeration separation process may be performed as it is without separating the foam.
[0030]
In the present invention, it is preferable to continue the post-process after the alum and oxidant addition process, but after the addition process 1-5 days later, the post-process (foam separation, coagulation separation, filtration, activated carbon treatment, etc.) May be performed. Addition of an oxidizing agent or the like suppresses spoilage and prevents odor generation, so there is no problem even if the post-process is delayed. If the amount of jellyfish is considerably smaller than the processing capacity of the processing device, and if the amount of jellyfish is too large to be processed compared to the processing capacity, it can be dealt with by processing it later.
[0031]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
[0032]
Example 1
The jellyfish was processed according to the flow shown in FIG.
[0033]
The jellyfish stored in the storage tank was crushed with a crushing pump, introduced into the foam separation tank 3 while adding an oxidizing agent and alum, and the foam was separated. As an oxidizing agent, an aqueous solution containing sodium hypochlorite having an effective chlorine concentration of 10% was added at a rate of 1000 mg / L (effective chlorine as 100 mg / L). As alum, a 10 wt% aqueous solution of potassium alum was added at a rate of 5000 mg / L (potassium alum addition amount 500 mg / L). Next, it is introduced into the flocculation / separation tank 4, and 38 wt% ferric chloride aqueous solution 2000 mg / L and anionic polymer flocculant 4 mg / L are added and subjected to pressure levitation separation to obtain flocculation levitation sludge and separated water. It was. This separated water was passed through a two-layer filter having an upper layer made of anthracite and the lower layer made of sand in a downward flow, and was then flowed downward to an activated carbon tower filled with granular activated carbon to obtain treated water.
[0034]
The coagulated and separated sludge was dehydrated with a centrifugal dehydrator, the dehydrated cake was discarded, and the dehydrated filtrate was returned to the coagulation / separation tank 4.
[0035]
Table 1 shows the COD concentration (CODMn) of jellyfish-containing water and treated water after crushing.
[0036]
Comparative Example 1
The same operation as in Example 1 was performed except that no alum was added, and the results are shown in Table 1.
[0037]
Example 2
In order to use oxygen in the air as an oxidant, the same operation as in Example 1 was performed except that air was blown from the diffuser at a rate of 2 L / min with respect to 1 L of water, and the results are shown in Table 1. It was.
[0038]
Comparative Example 2
The same operation as in Example 2 was performed except that no alum was added, and the results are shown in Table 1.
[0039]
Example 3
In Example 1, treatment was performed in exactly the same manner except that hydrogen peroxide was added as an oxidizing agent at a rate of 500 mg / L. The results are shown in Table 1.
[0040]
Comparative Example 3
The same operation as in Example 3 was performed except that no alum was added, and the results are shown in Table 1.
[0041]
Example 4
The same operation as in Example 3 was performed except that the amount of hydrogen peroxide added was 1000 mg / L. The results are shown in Table 1.
[0042]
Comparative Example 4
The same operation as in Example 4 was performed except that no alum was added, and the results are shown in Table 1.
[0043]
Example 5
The same operation as in Example 1 was performed except that the addition amount of an aqueous solution containing 10% effective hypochlorite sodium hypochlorite was 600 mg / L and the alum addition amount was 2500 mg / L. The results are shown in Table 1. .
[0044]
Example 6
The same operation as in Example 1 was performed except that the addition amount of hydrogen peroxide was 600 mg / L and the alum addition amount was 2500 mg / L. The results are shown in Table 1.
[0045]
[Table 1]
From Table 1, it can be seen that according to the present invention, the waste liquid produced in association with the jellyfish crushing treatment can be efficiently treated to obtain treated water with good water quality.
[0047]
【The invention's effect】
As described above in detail, according to the saddle down the processing method of the present invention, as well as volume reduction saddled down, it is possible to sufficiently purify process waste that occurs with the volume reduction.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of a jellyfish processing method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jellyfish storage tank 2 Jellyfish crushing means 3 Coagulation separation tank 4 Filter 5 Activated carbon tower 6 Dehydrator 7 Foam solidification tank
Claims (4)
この破砕物含有水にミョウバン及び酸化剤を添加する工程と、
次いで凝集剤を添加して凝集分離処理する工程と、
この凝集分離処理により得られた分離水を浄化する浄化工程と
を有することを特徴とするくらげの処理方法。Crushing jellyfish into crushed material-containing water;
Adding alum and oxidizing agent to the crushed material-containing water;
Next, a step of adding an aggregating agent and subjecting it to an aggregation separation process
Processing method of jellyfish, characterized in that it comprises a purification step of purifying separated water obtained by the coagulation and separation process.
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| JP2001225841A JP3925122B2 (en) | 2001-07-26 | 2001-07-26 | Jellyfish processing method |
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| JP2001225841A JP3925122B2 (en) | 2001-07-26 | 2001-07-26 | Jellyfish processing method |
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