JP6625907B2 - 排水処理方法および排水処理システム - Google Patents
排水処理方法および排水処理システム Download PDFInfo
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- 238000004065 wastewater treatment Methods 0.000 title claims description 54
- 239000002351 wastewater Substances 0.000 claims description 112
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- 239000006247 magnetic powder Substances 0.000 claims description 62
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- 230000001954 sterilising effect Effects 0.000 claims description 18
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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 1
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- B03C1/247—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
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Description
本発明は、第1実施形態によれば、排水処理方法であって、スクラバ(集じん装置)において排ガスとスクラバ洗浄水を接触させてなるスクラバ排水に、バラスト排水を、浮遊物質濃度が一定になるように混合する混合工程と、前記混合された排水に磁性粉を添加する処理工程と、前記処理工程で得られた浮遊物質と磁性粉の結合物(磁性フロック)を磁気分離する分離工程とを含む。
本発明は、第2実施形態によれば、排水処理方法であって、スクラバにおいて排ガスとスクラバ洗浄水を接触させてなるスクラバ排水に、バラスト排水を、浮遊物質濃度が一定になるように混合する混合工程と、前記混合された排水に磁性粉を添加する処理工程と、前記処理工程で得られた磁性フロックに凝集剤を添加する凝集工程と、前記凝集工程で得られた磁性フロックを磁気分離する分離工程とを含む。
本システムによる、浮遊物質と微生物の除去性能を検証した。スクラバ実排水に、微生物として大腸菌を1000cfuとなるように添加して作成し、静置したものの上澄みを採取し、本発明における混合排水の試験用排水とした。この試験用排水単体、試験用排水に磁性粉とポリ塩化アルミニウム(PAC)を添加して磁気分離を行ったもの、試験用排水に磁性粉とPACを添加した後に高分子凝集剤を添加し、磁気分離を行ったものの3種類で比較した。磁性粉(四三酸化鉄)は浮遊物質質量に対して1:1となるように添加し、PACは磁性粉添加後の濁度に対してALT比5となるように添加し、20秒間150rpmで急速撹拌を行った後、10分間20rpmでの緩速攪拌を行った。その後、高分子凝集剤を0.01ppmとなるように添加して5分間20rpmで緩速攪拌を行い、磁性フロックを形成させ、ネオジム磁石上に置き、上澄みの濁度及び生菌数を測定した。それぞれの結果を図3および4に示す。本システムにより、濁質が十分除去でき、生菌数も削減可能であることがわかった。
次に、同じ試験用排水を用い、凝集剤のみと凝集剤に磁場印可を組合せた時の磁性フロックの粒径を比較した。凝集剤は、実験例1と同じものを用い、浮遊物質質量に対してPAC、高分子凝集剤ともに実験例1と同量を添加した。この試料に対し、一方は、0.4Tのネオジウム磁石を用いて磁場を印加し、他方は磁場を印加することなく、凝集剤の添加時点を0分として、時間とフロック径の関係を調べた。磁場の印加は、測定中継続した。フロック径は、粒度分布系で測定し、中央値を測定値とした。図5に結果のグラフを示す。凝集剤のみではフロック径が1mm以上となるのに15分程度要していたのに対し、磁場印可を組合せることで5分以内に1mm以上となることがわかり、磁場の印加により、フロック成長の時間を大幅に短縮可能であることがわかった。
10 スクラバ
2 バラスト排水
3 混合装置
31 調節弁
32 調節弁
33 浮遊物質濃度測定装置
34 制御装置
4 磁性粉添加装置
41 処理槽
42 磁性粉添加ポンプ
43 磁性粉貯留槽
44 撹拌装置
5 磁気分離装置
61 凝集剤添加装置(ポンプ)
62 凝集剤貯留槽
63 磁場印加装置
Claims (16)
- スクラバにおいて排ガスとスクラバ洗浄水を接触させてなるスクラバ排水に、バラスト排水を、浮遊物質濃度または濁度が一定になるように混合する混合工程と、
前記混合された排水に磁性粉を添加する処理工程と、
前記処理工程で得られた磁性フロックを磁気分離する分離工程と
を含む、排水処理方法。 - 前記混合工程が、前記スクラバ排水中の浮遊物質濃度もしくは前記混合された排水中の浮遊物質濃度を測定する測定工程と、前記測定工程による測定結果に応じて前記バラスト排水とスクラバ排水との混合比を制御する制御工程とを含む、請求項1に記載の排水処理方法。
- 前記混合工程が、前記スクラバ排水中の濁度もしくは前記混合された排水中の濁度を測定する測定工程と、前記測定工程による測定結果に応じて前記バラスト排水と前記スクラバ排水との混合比を制御する制御工程とを含む、請求項1に記載の排水処理方法。
- 前記処理工程で得られた磁性フロックに、凝集剤を添加する凝集工程をさらに含み、凝集工程で得られた磁性フロックを磁気分離する、請求項1〜3のいずれか1項に記載の排水処理方法。
- 前記磁性フロックに磁場を印加する磁場印加工程をさらに含む、請求項1〜4のいずれか1項に記載の排水処理方法。
- 前記分離工程において前記磁性フロックを分離した後の処理済水に殺菌処理を行う殺菌工程をさらに含む、請求項1〜5のいずれか1項に記載の排水処理方法。
- 前記分離工程において前記磁性フロックを分離した後の処理済水を、前記スクラバ排水に循環させる工程をさらに含む、請求項1〜6のいずれか1項に記載の排水処理方法。
- 前記分離工程において前記磁性フロックを分離した後の処理済水を、前記スクラバ排水を貯留するスクラバ排水槽に返送する工程と、前記スクラバ排水槽の排水を前記スクラバに循環させる工程をさらに含む、請求項1〜7のいずれか1項に記載の排水処理方法。
- スクラバにおいて排ガスとスクラバ洗浄水を接触させてなるスクラバ排水に、バラスト排水を浮遊物質濃度または濁度が一定になるように混合する混合装置と、
前記混合装置で得られた混合排水に磁性粉を添加する磁性粉添加装置と、
前記磁性粉添加装置で得られた磁性フロックを磁気分離する磁気分離装置と
を備える、排水処理システム。 - 前記混合装置が、前記スクラバ排水中の浮遊物質濃度もしくは前記混合された排水中の浮遊物質濃度または濁度を測定する測定装置と、前記測定装置による測定結果に応じて前記バラスト排水とスクラバ排水との混合比を制御する制御装置とを含む、請求項9に記載の排水処理システム。
- 前記磁性粉添加装置で得られた磁性フロックに、凝集剤を添加する凝集剤添加装置をさらに備える、請求項9または10に記載の排水処理システム。
- 前記磁性粉添加装置が、磁性粉が添加される処理槽を備え、前記処理槽が撹拌装置を備える請求項9〜11のいずれか1項に記載の排水処理システム。
- 前記磁性粉添加装置が、磁性粉が添加される処理槽を備え、前記凝集剤添加装置が、凝集剤が添加される前記処理槽とは独立した凝集槽を備え、前記処理槽及び/または前記凝集槽が撹拌装置を備える、請求項11に記載の排水処理システム。
- 磁性粉を添加した後の排水に磁場を印加する磁場印加装置をさらに備える、請求項9〜13のいずれか1項に記載の排水処理システム。
- 前記磁気分離装置により磁性フロックを分離した後の処理済水に殺菌処理を行う殺菌装置をさらに含む、請求項9〜14のいずれか1項に記載の排水処理システム。
- 前記磁気分離装置により前記磁性フロックを分離した後の処理済水を、前記スクラバに循環させる手段をさらに含む、請求項9〜15のいずれか1項に記載の排水処理システム。
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