JP5622261B2 - 下水汚泥の処理方法 - Google Patents
下水汚泥の処理方法 Download PDFInfo
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- JP5622261B2 JP5622261B2 JP2010035495A JP2010035495A JP5622261B2 JP 5622261 B2 JP5622261 B2 JP 5622261B2 JP 2010035495 A JP2010035495 A JP 2010035495A JP 2010035495 A JP2010035495 A JP 2010035495A JP 5622261 B2 JP5622261 B2 JP 5622261B2
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- water
- sludge
- oil
- monomer
- polymer
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- 238000012545 processing Methods 0.000 claims description 3
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- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000007883 water-soluble azo polymerization initiator Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
-
- B01F3/08—
-
- B01F5/02—
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- General Chemical & Material Sciences (AREA)
Description
させることができ、その結果電気代を節約することが期待できる。さらに回収率の向上によって返流水の負荷が軽減されることによって、生物処理のブロアーの電気代も軽減することが期待できる。
ジョンを形成させ重合したエマルジョンは、このままで水となじむので転相剤
を添加する必用がない。これら界面活性剤のHLBは、9〜20のもの、好ま
しくは11〜20のものを使用する。そのような界面活性剤の例としては、カ
チオン性界面活性剤やHLB9〜15のノニオン性界面活性剤であり、ポリオ
キシエチレンポリオキシプロピレンアルキルエ−テル系、ポリオキシエチレン
アルコールエ−テル系などである。
ビス(アミジノプロパン)二塩化水素化物または2、2’−アゾビス〔2−
(5−メチル−2−イミダゾリン−2−イル)プロパン〕二塩化水素化物のよ
うな水溶性アゾ系重合開始剤、あるいは過硫酸アンモニウムおよび亜硫酸水素
ナトリウム併用のような水溶性レドックス系重合開始剤を添加し、撹拌下ラジ
カル重合を行う。
DMQ:アクリロイルオキシエチルトリメチルアンモニウム塩化物
DMC:メタクリロイルオキシエチルトリメチルアンモニウム塩化物
AAM:アクリルアミド、AAC:アクリル酸、
MBA:メチレンビスアクリルアミド(単量体総量に対する質量%)
EM:油中水型エマルジョン、DI:塩水中分散液
エマルジョン凝集剤粘度:mPa・s、
図1の希釈システムフローに示す攪拌機の付いた高分子凝集剤希釈槽に5m3の水道水を仕込み、油中水型エマルジョンEM−1を2L/minの速度で12.5分間供給し0.2質量%希釈液を調製した。1時間攪拌し希釈液を調製した後、実施例1で使用したものと同じ下水混合生汚泥を用い、11m3/hrで上記汚泥を汚泥凝集混合槽に供給し、前記0.2質量%希釈液を183L/hrで前記汚泥凝集混合槽に供給した(対ss分0.3質量%の添加量に相当)。この凝集汚泥を図に示していないベルト型濃縮機によって濃縮操作を行い、濃縮汚泥貯槽に移送した。濃縮後の汚泥は29,300mg/Lであった。
同様にEM−3およびDI−1に関しても同様な試験を実施した。結果を表2に示す。
脱離水中のSS分:mg/L、ケーキ含水率:質量%、薬注量:対ss質量%
遠心濃縮機15へ供給される。汚泥供給11が行われ、凝集、濃縮操作が実施される。
図1の希釈システムフローに示す攪拌機の付いた高分子凝集剤希釈槽に5m3の水道水を仕込み、油中水型エマルジョンEM−2を2L/minの速度で12.5分間供給し0.19質量%希釈液を調製した。希釈液を調製した後、実施例1で使用したものと同じ下水混合生汚泥を用い、11m3/hrで上記汚泥を遠心濃縮機15に供給し、ラインミキサーより排出される油中水型エマルジョンEM−2希釈液を30.5L/hrで前記汚泥凝集混合槽に供給し(対ss分0.05質量%の添加量に相当)、濃縮操作を実施し濃縮汚泥貯槽に移送した。濃縮後の汚泥濃度は、27,800mg/Lであった。同様にEM−4およびEM−5に関しても同様な試験を実施した。結果を表3に示す。
脱離水中のSS分:mg/L、ケーキ含水率:質量%、薬注量:対ss質量%
2 希釈水供給ポンプ
3 流量計2
4 希釈水流量調節バルブ
5 乱流を発生させる機能を有するノズル
6 T字型継ぎ手
7 ラインミキサー
8 分散型高分子凝集剤
9 分散型高分子凝集剤供給ポンプ
10 逆止弁
11 汚泥の供給
12 汚泥凝集混合槽
13 バッチ式高分子凝集剤希釈槽
14 凝集処理後、ベルト濃縮機、その後汚泥脱水機へ移送
15 遠心濃縮機、
16 汚泥脱水機へ移送
Claims (4)
- 分散型高分子凝集剤として、疎水性単量体と、カチオン性単量体、アニオン性単量体、およびポリオキシエチレン鎖を有する単量体から選択される一種あるいは二種との共重合物からなる油溶性高分子を配合する、粘度が270〜500mPa・sの油中水型高分子エマルジョン原液であり、該油中水型高分子エマルジョンを構成する高分子のカチオン性単量体として、アクリロイルオキシエチルトリメチルアンモニウム塩化物、メタクリロイルオキシエチルトリメチルアンモニウム塩化物から選択される一種以上を60〜90モル%含有し、重量平均分子量が500万〜1000万である油中水型高分子エマルジョン原液と希釈水を配管に供給し前記配管中で接触させ、混合し調製された希釈液を、汚泥処理設備における遠心濃縮機に供給し凝集操作および濃縮操作をすることを特徴とする下水余剰汚泥の処理方法。
- 前記分散型高分子凝集剤と前記希釈水を配管中で接触させる手段にT字型継手
を用い、前記希釈水の流水方向に対し前記分散型高分子凝集剤と前記希釈水が接触する部分から手前10mm以上100mm以下の位置に希釈水の流速を高めるとともに乱流を発生させる機能を有するノズルを設置することを特徴とする請求項1に記載の下水余剰汚泥の処理方法。 - 前記ノズルが、羽型ノズルであることを特徴とする請求項2に記載の下水余剰汚泥の処理方法。
- 前記分散型高分子凝集剤と前記希釈水が接触する点から手前200mm以内の前記分散型高分子凝集剤の配管に逆止弁を設置することを特徴とする請求項2に記載の下水余剰汚泥の処理方法。
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JPS60227819A (ja) * | 1984-04-27 | 1985-11-13 | Noritake Co Ltd | 流体混合装置 |
JPS63274409A (ja) * | 1987-05-06 | 1988-11-11 | Sanyo Chem Ind Ltd | 有機性汚泥の脱水法 |
JPH0377700A (ja) * | 1989-08-21 | 1991-04-03 | Ishikawajima Harima Heavy Ind Co Ltd | 汚泥濃縮方法 |
JP2745106B2 (ja) * | 1994-06-06 | 1998-04-28 | 多木化学株式会社 | エマルジョン高分子凝集剤希釈注入システム |
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