の下水道技術 Sewerage Technology in Osaka City 水環境の保全 Water Quality Control では高度経済成長期と呼ばれた 1960 年代後半 生活排水や工場からの汚れた排水によ り 河川の水質が大幅に悪化しました この問題を解決するため 1960 年代

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1 の浸水対策 Flood Control Measures in Osaka City はほとんどの土地が満潮水位より低くなっており 降った雨が自然に排水できず 市域の約 90% の場所がポンプ排水に頼らなければならない 雨に弱い地形となっています そのため度々大雨で 浸水被害が発生しました そこで浸水被害を防ぐために様々な対策を実施してきました Most part of the Osaka City area is low-lying and below sea level at high tide, thereby vulnerable to rainfall. In 90% of the city area, runoff cannot be gravity drained and has to be pumped out. Thus, flooding has often occurred in these areas during the heavy rain events. Osaka City has taken various measures for flood control. These had greatly contributed to the alleviation of flood damage. 自然排水可能区域 Gravity flow drainage area の技術 Multiple Approaches for Flood Control 大規模下水管の整備 Construction of trunk sewers ポンプ場の整備 Construction of pumping stations 雨水貯留施設 Rainwater storage facilities 局所ポンプ排水施設の建設 Installation of in-situ pumping facilities 施設管理システムによる一元管理 Integrated facility management using the sewer management system 降雨レーダーによる降雨状況観測 Real-time estimation of rainfall fields using radar rainfall data

2 の下水道技術 Sewerage Technology in Osaka City 水環境の保全 Water Quality Control では高度経済成長期と呼ばれた 1960 年代後半 生活排水や工場からの汚れた排水によ り 河川の水質が大幅に悪化しました この問題を解決するため 1960 年代後半からの 10 年間で 下水道の整備を集中的に行い 日本の大都市では最も早く下水道の普及をほぼ完了しました 施設整備にあたっては 既存施設を最大限活用した独自の技術を開発し 低コストでの 水環境の保全に努めています In the late 1960s, the river water quality in Osaka City significantly deteriorated due to domestic and industrial wastewater. To solve this problem, the sewerage system has been improved intensively since then. Ten years later, Osaka City had almost finished installation of an advanced sewerage system, earlier than any other major cities in Japan. On top of that, Osaka City has been striving to conserve its aquatic environment at low cost by developing unique technologies that make the best use of existing facilities. の有する技術 Cutting-Edge Technologies of Osaka City 降雨初期の汚れた雨水を一時的に貯留し 降雨後 下水処理場で処理し 河川に放流しています First flush, rainwater containing high pollutant load,is temporarily stored in reservoirs or pipes and treated in sewage treatment facilities before discharging to rivers. さらなる水質改善を図るため 急速濾過などの高度処理施設の導入を進めています Sand filtration To further improve the water quality, advanced water treatment facilities such as rapid sand filtration are installed.. 雨水滞水池 Stormwater reservoir 平成の太閤下水 Stormwater storage pipeline 高度処理施設 ( 急速濾過池 ) Advanced water treatment facility (Rapid sand filtration tank) 汚水 雨水 Existing step gate Thermophilic / high concentration digestion system 消化ガス Digestion gas 汚泥集中処理 Central sludge treatment facility 溶融炉 Melting furnace 溶融スラグ Melted slag (Granulated) 汚水雨水 最初沈殿池 Primary settling tank 生物反応槽 Reaction tank 最終沈殿池高度処理施設 Final settling tank Advanced treatment 河川 River 濃縮施設 Thickener 消化槽 Digester tank Sludge pipeline 脱水機 Dehydrator 炭化燃料 Carbonized Fuel 炭化炉 Carbonization furnace 既存の最初沈殿池に傾斜板を入れ 沈殿能力の増加を図ります Inclined plates are added in primary settling tanks to increase the existing settling capability. 傾斜板ユニット 集水管 Inclined plate unit & water collection pipes (patented) 既存の最初沈殿池に導入 従来の沈殿池に比べ高度処理が可能で 省スペース化が図れます Filtration installed in existing primary settling tanks provides high rate treatment which saves settling space. Inflow of rainwater Filtered Water Elutriating tank Existing frame Filtering Material Upper Screen ろ材 高速濾過施設 Rapid filtration facility Materials to be removed 既存反応槽の簡易な改造により 雨天時の活性汚泥処理能力を 3 倍にします Treatment capacity in wet weather can be tripled by step feeding. Wet weather wastewater (3Qsh) tank Discharge after (2Qsh) 1Qsh Aeration tank 2Qsh Return sludge Activated sludge treatment (3Qsh) Primary Final tank 雨天時活性汚泥処理 Wet weather wastewater treatment

3 の下水道技術 Sewerage Technology in Osaka City 資源 エネルギーの有効活用 Beneficial Use of Resources/Energy では 下水道が有する処理水 汚泥 排熱等の資源やエネルギーを有効に活用 回収し 省エネルギー化とエネルギー 資源の創出を図っています また 下水道施設の上部空間を有効活用し 下水処理水のせせらぎ用水等への利用を図っています Osaka City promotes energy saving and energy/resource generation by effectively collecting and using energy from resources such as treated wastewater, sludge and exhaust heat. Treated wastewater is used for artificial river sources and other purposes. The city also promotes effective use of sewerage facility rooftops. 太陽光発電 Photovoltaic Generation 太陽光発電 Photovoltaic generation 下水熱利用 Recycling heat energy from sewage 冬季に外気温度より高く 夏季に外気より低い下水の温度を利用し 空調等のヒートポンプを外気利用よりも高効率化 The temperature of sewage is higher in winter and lower in summer than outdoor Heat temperature, which Heat allows heat pumps to operate more effectively than they use outside air. 管路内設置型熱回収技術 Heat-Recycle-System Inside of Swage Pipe エネルギー回収 Energy recovery 高温高濃度消化法により消化ガス発生率の増加を図ると共にPFI/PPP 手法により 消化ガスの発電利用を行っています By employing thermophilic highconcentration digestion method, the amount of digestion gas is increased. Digestion gas is used for power generation by utilizing PPP(Public-Private Partnership)/ PFI(Private Finance Initiative). 消化ガス発電 Power generation using digestion gas Existing step gate Thermophilic / high concentration digestion system Digestion gas Central sludge Melting furnace treatment facility Sludge pipeline Primary settling tank Reaction tank Final settling tank Advanced treatment River Thickener Digester tank Dehydrator Melted slag (Granulated) Carbonization furnace Carbonized Fuel 下水処理水の再利用 Reuse of wastewater 水質の保全を図ると共に下水処理水の再利用を図り 清らかな水環境の創造を図っています While improving the quality of treated wastewater, Osaka City promotes the reuse of treated wastewater to create refreshing waterfront. せせらぎ Treated wastewater used for artificial waterfront 汚泥集中処理 Centralized sludge Treatment 下水汚泥を送泥ネットワークを構築し 集中処理するとともに 溶融スラグ並びに炭化燃料化物として 全量有効利用しています In addition to centralized sludge treatment based on sludge transportation pipe network, Osaka City fully utilizes all sewage sludge by converting the sludge into melted slag or carbonized fuel. Ono S.T.P Konohana S.T.P Maishima Sludge Center Juhatijo S.T.P Tsumori S.T.P Suminoe S.T.P Ebie S.T.P Ichioka S.T.P Chishima S.T.P Nakamaha S.T.P Imahuku S.T.P Hanaten S.T.P Hirano S.T.P 送泥ネットワーク Sludge transportation pipes 舞洲スラッジセンター Maishima Sludge Center 汚泥炭化施設 Sludge Carbonizing Facility 維持管理 Management & Maintenance 施設管理計画 ( ストックマネジメント ) Asset Management Planning 膨大な下水道施設の老朽化状況等を客観的に把握 評価し 下水道施設を計画的かつ効率的に改築修繕 維持管理するための施設管理計画 ( ストックマネジメント ) の策定を進めています Asset management planning is now in progress to objectively grasp and evaluate the situation of a huge number of aging sewerage facilities, and effectively and systematically repair and maintain them. 施設管理 ( 管路 ) システム Sewer Management System では施設管理 ( 管路 ) システム (AS マップ ) により 市内の下水道管 ( 総延長約 4900km) の情報を一元的に管理し 効率的な維持管理業務 老朽管のリフレッシュ化支援並びに多様化する市民ニーズに対応しています Osaka City centrally manages the information of sewers in the city (total length: 4,900 km) using the sewer management system (AS map) to effectively manage and maintain the pipes, support restoring old pipes and respond to diversified citizens needs.

4 下水道における海外展開の取り組み ( ベトナム ) International Cooperation in Sewage Works in Vietnam Osaka City 中国 CHINA ラオス LAOS ハノイ HANOI タイ THAILAND 主な課題 Main Issues 有毒ガスの確認作業 Toxic gas Check (July 2013) FY 2015 カンボジア CAMBODIA ホーチミン HO CHI MINH 浸水の状況 Flooding in Ho Chi Minh City(HCMC) 浸水に弱い地形 ( と同様に海面より低い低平地 ) 排水施設の老朽化 ( フランス植民地時代の 1870 年代に整備 ) FY 2013~2015 老朽化が進んだ下水管 Sewer pipe with aging Flood-prone land ~Flat low-lying area below sea level similar to Osaka City Deterioration of drainage facilities ~ Constructed during French colonial rule in the 1870s ベトナム国ホーチミン市における都市排水管理技術向上プロジェクト Project for capacity improvement of urban drainage management とクリアウォーター OSAKA( 株 )( 以下 CWO ) が JICA の草の根技術協力事業 ( 地域提案型 ) を活用し ホーチミン市の下水道部門を対象として下水管渠の維持管理や安全管理などの技術指導を行いました Osaka City and Clearwater OSAKA Co., Ltd. (CWO) have provided technical guidance on O&M, including safety management, of urban drainage facilities in HCMC under JICA s Partnership Program. 非開削下水道管路更生工法普及促進事業 Disseminating Japanese Trenchless Pipe Rehabilitation Technology CWO と積水化学工業 ( 株 ) が JICA の民間技術普及促進事業を活用し ホーチミン市内中心部に埋設された老朽化した下水道管に対して 非開削管路更生工法を試験適用するパイロット施工事業を行いました CWO and SEKISUI CHEMICAL CO., LTD. have implemented a pilot project to test- install the Trenchless Pipe Rehabilitation Technology in aged sewers in the center of HCMC in the form of JICA s Partnership Program. 現地調査状況 Field Survey (October 2016) FY 2016~2018 ベトナム国ホーチミン市非開削下水道管路更生計画準備調査 The Preparatory Survey for The Project for the Trenchless Sewerage Pipe Rehabilitation 管路更生工法の施工状況 Pilot construction of Pipe Rehabilitation Technology (September 2015) CWO と日水コン ( 株 ) の JV がホーチミン市中心部の老朽下水管の非開削工法等による更生に向けた現地調査や概略設計を行っています は この無償資金協力事業を JICA に提案し アドバイザーとして参画しています JV of CWO and Nissui Kon Co., Ltd. is carrying out field survey and creating outline design for rehabilitation by the Trenchless Sewerage Pipe Rehabilitation in the center of HCMC. Osaka City proposed this grant aid project to JICA and is participating as an advisor to JICA.

5 インド INDIA 下水道における海外展開の取組み ( ミャンマー ロシア ) Osaka City ミャンマー MYANMAR ヤンゴン YANGON 中国 タイ ラオス FY 2017~2020 主な課題 Main Issues 排水施設の能力不足及び老朽化 ( イギリス統治時代の 1890 年代に整備 ) 施設の適切な維持管理 Insufficiency and deterioration of drainage facilities ~Constructed during British colonial rule in the 1890s Proper maintenance of the facilities 生活排水の雨水排水路への放流 Discharge of gray water into a side ditch ヤンゴン市下水処理場管理 保全能力向上プロジェクト Yangon City Sewage Treatment Plant Management and Maintenance Capacity Building Improvement Project は JICA の草の根技術協力事業を活用し CWO( 株 ) 堀場アト ハ ンスト テクノと連携して ヤンゴン市において 下水処理場の運転維持管理ノウハウ 排水規制等に関する技術移転を行っています Utilizing JICA s partnership program, Osaka City, collaborated with CWO and Horiba Advanced Techno Co., Ltd. is transferring technology regarding the know-how for operation and maintenance of sewage treatment plant, and wastewater regulation in Yangon city. FY 2015~ Saint Petersburg Moscow CHINA LAOS THAILAND FY 2014~2016 FY 2017 Khabarovsk Vladivostok サンクトペテルブルク市との上下水道分野の技術交流 International Cooperation in Sewage Works in Myanmar and Russia 下水道事業の理解促進 本邦技術の普及方策に係る調査検討業務 The study on promotion measures for understanding of sewage works and spreading of Japanese technology Technical exchange in the field of waterworks and sewerage systems between St. Petersburg City and Osaka City Yuzhno- Sakhalinsk ヤンゴン市における下水管渠維持管理 修復能力改善事業 Project on Capacity Development of Sewer Operation & Maintenance and Repair in Yangon City と CWO は JICA の草の根技術協力事業を活用し 積水化学工業 ( 株 ) と連携して ヤンゴン市において 下水道管渠の維持管理技術等に関する技術移転を行いました Osaka City and CWO have transferred technologies to Yangon City, such as technologies for O&M of sewer facilities, in cooperation with SEKISUI CHEMICAL Co., LTD. under JICA s partnership program. 国土交通省の海外 FS 調査の採択を受け は CWO 日水コンと連携し 親日イベントを活用したヤンゴン市民向けの啓発活動をヤンゴン市当局と共同で行い ヤンゴン市民意識調査等を通じた技術移転を行いました Received the adoption of overseas FS by MLIT, Osaka City, collaborated with CWO and Nissui Kon CO., LTD, implemented awareness activities for Yangon citizens utilizing pro- Japan event in collaboration with the Yangon City authorities. We carried out technology transfer through citizens sewage awareness survey. サンクトペテルブルク市との姉妹都市交流の一環として 上下水道分野の技術交流に関する覚書を締結しました 上下水道事業者間の技術対話に加えて 日本企業のネットワーキング活動も行っています As part of sister-city exchange, Osaka City has concluded an MOU for technical exchange in the field of waterworks and sewerage systems with St. Petersburg City. It also supports Japanese companies to build business network there. 上下水道分野の技術交流覚書締結 Conclusion of an MOU for technical exchange in the field of waterworks and sewerage systems

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