JP5300895B2 - 海底汚泥の除去処理システム - Google Patents
海底汚泥の除去処理システム Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
- Farming Of Fish And Shellfish (AREA)
- Filtering Materials (AREA)
Description
現状においては、海底汚泥表層面を健全な砂で覆う、所謂覆砂処理方法があるが、覆砂下面に有機物残存があれば、硫酸還元菌と作用して硫化ガスが発生し、発生した硫化ガスは被覆砂内部に充満し、その後表面に達する。その結果、嫌気性生物が覆砂底面から表層に移動して表層健全生物を凌駕することとなり、再び不健全化してしまう。
具体的には、図6に示すように、少なくとも、海底汚泥を含有する汚泥を充填し、ビタミン類を添加して分解反応を行うための第1反応槽101と、この汚泥に酸素非含有気体を通気するための通気管102と、汚泥の上澄み液であって、汚泥の分解反応により生成する有機体を含有する上澄み液を抜き取るための送液手段103と、この上澄み液を供給し、有機酸の分解反応を行うための反応槽であって、有機酸分解能を有する微生物を含有する第2反応槽104と、有機酸の分解により発生した気体を第2反応槽104から除去する手段と、有機酸を分解した後の排出液を放出する手段を有する構成の汚泥処理装置が知られている。
<実施例1>
図1は本発明を適用した海底汚泥の除去処理システムの一例を説明するための平面模式図であり、図2は本発明を適用した海底汚泥の除去処理システムの一例を説明するための側面模式図である。
なお、汚泥の深さは通常10cm程度である。
なお、樋部7以外の底面17には防水シート11が覆着されていることから、地盤に汚水が浸透せず、排水ドレーン4内にろ過シート10を通して樋部7内に通水される。
この際に、除去海底汚泥の硫化物含有が(0.1〜0.2)mg/g、有機物含有が8%超で10%以下、DXNが(150〜1000)pg−TEQ/g−dry、TBTが(300〜1000)ng/gである場合には、濾過水の濁度が2程度以下となるまで濾過をした後に放流する。
なお、有機物が多い場合、天日乾燥効果が悪い気象状況次第では次亜塩素酸カルシウム、生石灰等を散布し悪臭発生化合物の酸化を促進し対応する。
また、ダイオキシン類は、同じ量(ピコグラム数)でも種類(塩素原子の置換位置・数:右の構造式で5と10を除く全ての位置に水素原子に換わって塩素原子が入る事ができる)によって毒性が大きく異なる。このために、毒性(環境に与える影響)を評価するときは、ダイオキシン類の中で最も毒性に強い、右の構造を持った2、3、7,8−tetrachloro dibenzo―p−dioxin:2、3、7、8―四塩化ジベンゾーバラージオキシン)の毒性を1として他のダイオキシンの毒性の強さを換算して評価している。
図5は本発明を適用した海底汚泥の除去処理システムにおける処理槽の一例を説明するための模式図である。
なお、汚泥の深さは通常10cm程度である。
なお、樋部7以外の底面17には防水シート11が覆着されていることから、地盤に汚水が浸透せず、排水ドレーン4内にろ過シート10を通して樋部7内に通水される。
なお、有機物が多い場合、天日乾燥効果が悪い気象状況次第では次亜塩素酸カルシウム、石灰等を散布し悪臭発生化合物の酸化を促進し対応する。
2 囲繞堤
3 処理槽
4 排水ドレーン
5 誘導路
6 貯留タンク
7 樋部
8 地盤
9 砕石
10 ろ過シート
11 防水シート
12 砂
13 砂表面被膜シート
14 排水路
15 ドレーン材
16 真空ポンプ
17 底面
Claims (7)
- 泥水化された有機物を含む高含水比の浚渫土砂が投入される処理槽と、
前記処理槽の底面に形成された溝状の排水ドレーンと、
前記排水ドレーンの開口端に覆着されたろ過シートと、
前記排水ドレーン以外の底面上に覆設された防水シートと、
前記ろ過シート及び防水シート上に積層された砂とを備える
海水汚泥の除去処理システム。 - 前記排水ドレーン内に砕石が充填された
請求項1に記載の海水汚泥の除去処理システム。 - 前記積層される砂の上に通水性の砂表面被膜シートが設けられた
請求項1または請求項2に記載の海水汚泥の除去処理システム。 - 前記排水ドレーンが前記底面に複数設けられた
請求項1、請求項2または請求項3に記載の海水汚泥の除去処理システム。 - 前記排水ドレーンは、前記処理槽の外部に配置された貯留タンクに連通された
請求項1、請求項2、請求項3または請求項4に記載の海水汚泥の除去処理システム。 - 前記ろ過シートは、ポリエチレン系、あるいはポリエステル系不織布から形成された
請求項1、請求項2、請求項3または請求項4に記載の海水汚泥の除去処理システム。 - 前記処理槽内にドレーン材が配置され、該ドレーン材に真空ポンプが接続された
請求項1、請求項2、請求項3、請求項4、請求項5または請求項6に記載の海水汚泥の除去処理システム。
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