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No untreated wastewater flows into rivers, and river water quality has significantly improved. BOD values in major rivers in the city decreased 40 – 87 percent in 2013 from those in 1984. The number of treatment plants applies advanced treatment process increased from two in 1996 to eight in 2013. As the result, the removal rate of nitrogen and phosphorus increased.\u003C/p>\u003Cp>In addition, small streams where ozonized reclaimed water is used provide excellent waterfront and leisure space for citizens. The efforts to pursue sustainability for sewage systems also contributes to serve as inundation mitigation during floods.\u003C/p>\u003Cp>Water quality in rivers, streams and coastal waters in Yokohama has improved due to its sewage system. Improved water quality also resulted in the increase of diversity of fish in the main rivers. 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Daily management of systems has been strengthened to prolong the life of facilities and pipes, and a database of data and information on the sewage systems is being developed.\u003C/p>\u003Cp>The renewal plan also includes the introduction of advanced treatment technology which enables for treated wastewater to be utilized for various purposes in the city. For example, ozonized water is utilized for toilets, small artificial streams, and air conditioning systems (AC), while sand filtered water is reclaimed for cleaning the wastewater treatment plants and toilets.\u003C/p>\u003Cp>Moreover, sludge generated from the wastewater treatment process can also be recycled. After collection, they are transported to two sludge treatment plants, and then subject to thickening, digestion, and dehydration processes. Gas generated during the digestion process is recovered as a source of energy, and utilized for electricity generation and fuel for incineration in the treatment plants. The ash after incineration has also been used as raw material for improved soil and cement. Local governments and sewage management bodies may decrease the significant volume of final disposal by cautiously processing the sludge and recycling it to fertilizer for farm land, construction materials, and a source of energy.\u003C/p>",[227],{"name":228,"type":229,"value":228},"https://panorama.solutions/en/solution/sustainable-sewage-management","link","published",false,[233,238,243,248,253,258,264,269,274,278,283,287,291,296,301],{"id":234,"title":235,"type":84,"image":236,"isCE":231,"edit":231,"date":237},"4035","Government program to reuse plastic in roads","https://kh-assets.prod.circularity-gap.world/main-image/1778083060480-kmTgZWUJ.jpeg","2024-01-23T12:06:32.574Z",{"id":239,"title":240,"type":84,"image":241,"isCE":231,"edit":231,"date":242},"9432","Curitiba, Brazil, is a model of transit-oriented planning","https://kh-assets.prod.circularity-gap.world/main-image/1778092852657-H-7_Vcau.jpeg","2025-01-17T16:27:43.135Z",{"id":244,"title":245,"type":84,"image":246,"isCE":231,"edit":231,"date":247},"7660","Quezon City's urban agriculture programme","https://kh-assets.prod.circularity-gap.world/main-image/1778092643941-H7PYFeKa.jpeg","2024-01-11T15:37:26.325Z",{"id":249,"title":250,"type":84,"image":251,"isCE":231,"edit":231,"date":252},"7658","Biodegradable waste treatment facility project in Quezon","https://kh-assets.prod.circularity-gap.world/main-image/1778092642417-SKxo2fbN.jpeg","2024-01-11T15:52:20.911Z",{"id":254,"title":255,"type":84,"image":256,"isCE":231,"edit":231,"date":257},"18460","The Uyghur Forced Labor Prevention Act (UFLPA): Enhancing Transparency of the Clothing Supply Chain","https://kh-assets.prod.circularity-gap.world/main-image/1778152764570-DqutwgGd.jpeg","2024-01-24T12:57:28.224Z",{"id":259,"title":260,"type":261,"image":262,"isCE":231,"edit":231,"date":263},"5124","Glass facade recycling into new glass","business_case","https://kh-assets.prod.circularity-gap.world/main-image/1778092596259-jkA2dqsH.jpeg","2025-01-23T13:12:41.272Z",{"id":265,"title":266,"type":261,"image":267,"isCE":231,"edit":231,"date":268},"8903","Ecodicta - rental wardrobe and fashion sharing service by subscription in Spain","https://kh-assets.prod.circularity-gap.world/main-image/1778152513912-cPmcL38F.jpeg","2024-01-23T14:26:19.873Z",{"id":270,"title":271,"type":84,"image":272,"isCE":231,"edit":231,"date":273},"8140","Commitment to Clean Construction in Nordic cities","https://kh-assets.prod.circularity-gap.world/main-image/1778092714406-lWbv76OY.jpeg","2025-05-09T13:22:26.016Z",{"id":275,"title":276,"type":84,"image":-1,"isCE":231,"edit":231,"date":277},"9036","Urban agriculture in Rosario","2025-01-17T16:24:36.262Z",{"id":279,"title":280,"type":84,"image":281,"isCE":231,"edit":231,"date":282},"9048","Turku, Yokohama and Nagano launch the 1.5-Degree Life Campaign","https://kh-assets.prod.circularity-gap.world/main-image/1778092785357-fVgod9vr.png","2025-07-02T09:56:24.602Z",{"id":284,"title":285,"type":84,"image":-1,"isCE":231,"edit":231,"date":286},"10306","Pilot project: Circular procurement training in Kongsvinger","2025-05-09T13:25:34.272Z",{"id":288,"title":289,"type":84,"image":-1,"isCE":231,"edit":231,"date":290},"9060","Volta Redonda's Eco-Oil Program turns cooking oil into biodiesel","2025-01-17T16:24:49.122Z",{"id":292,"title":293,"type":84,"image":294,"isCE":231,"edit":231,"date":295},"8247","Municipal building tender criteria on environmental performance - Olso","https://kh-assets.prod.circularity-gap.world/main-image/1778092727629-OtBpOHSb.jpeg","2025-05-09T13:25:03.240Z",{"id":297,"title":298,"type":84,"image":299,"isCE":231,"edit":231,"date":300},"9072","Helsinki demolition contracts mandate circularity","https://kh-assets.prod.circularity-gap.world/main-image/1778092800026-c2HDURUu.jpeg","2025-01-17T16:33:32.823Z",{"id":302,"title":303,"type":84,"image":304,"isCE":231,"edit":231,"date":305},"10507","Raising awareness on the benefits of a healthy and sustainable diet through the publication of \"The smart kitchen\" book","https://kh-assets.prod.circularity-gap.world/main-image/1778092920722-jgYzE6Fa.jpeg","2025-01-17T16:33:57.922Z",{"likeCount":219,"isLiked":231}]