Domestic Wastewater Treatment. by Johkasou Systems in Japan
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1 Domestic Wastewater Treatment by Johkasou Systems in Japan Hiroshi Ogawa Japan Education Center of Environmental Sanitation Kikukawa, Sumida-ku, Tokyo , Japan
2 What is Johkasou? Blower Air pipe Inflow pipe Wastewater pit Johkasou (building frame) Disinfection chamber Outflow pipe (effluent) An Example of Johkasou Installed at Individual House
3 A small-scale Johkasou (FRP) Effluent water quality BOD 20 mg/l Influent Anaerobic filter tank Contact aeration tank Sedimentation tank Disinfection tank Effluent Separated sludge Sludge
4 A Middle-scale Johkasou (FRP)
5 A Middle-scale Johkasou (RC)
6 Main Systems for Domestic Wastewater Treatment Johkasou Rural Sewerage Public Sewerage
7 Various Systems for Treatment of Night Soil, Sewage and Wastewater in Japan Night soil (Storage tank) Night soil treatment facility 1 Tandoku-shori johkasou 2 Domestic wastewater Separate sewer system Combined sewer system Sewerage system Night soil + Gray water 3 Johkasou 4 Rural sewerage system Community plant Storm wastewater (Urban storm drainage system) Note: 1. Night soil treatment facilities also treat sludge collected from tandoku-shori johkasous, community plants, gappei-shori johkasous and sewerage system in rural area. 2. The many are installed in individual houses. 3. Gray water is miscellaneous domestic wastewater except night soil. 4. Though not many facilities are installed in individual houses, the number is increasing. Public water bodies
8 Trends of Populations Served by Johkasou, etc. Total population Population of flush toilets use Population served by sewerage system Population of johkasou use
9 Advantages of Johkasou System Flush toilets can be used in unsewered districts. Miscellaneous domestic wastewater can be treated, contributing to prevention of water pollution. Conserving water in small rivers, a human-closely water environment will be formed. A small-scale johkasou can be installed at a low cost and in short time. Wastewater collection and johkasou installation receive less influence of topographic conditions at the site. Treated water can easily be reused for various purposes as a reliable water resource. Sludge from johkasous can be used as fertilizer or for biomass production. Johkasous have high resistance against earthquake and other disasters.
10 BOD Loading per capita per day of Domestic Wastewater from Household Cleaning Cooking Night soil Gray water BOD loading 43g/cap Bathing Cooking Cleaning etc. Washing/Bathing Flush toilet 40L 72L 38L 50L Wastewater amount (200L/cap day)
11 Legal Systems of Johkasou Systems Johkasou Law Administrative Agencies Johkasou Manager Related Personnel Administrative Agencies Governor Or Mayor Submission Recommendation Document inspection for installation Application Manufacturer Approval of type and model Minister of Land, Infrastructure and Transport Specified administrative agency Minister of the Environment or Governor Order of modification Or rejection Designation Specified inspection agency Construction Legal examination after installation Construction company Johkasou installation worker Agency for the examination Agency for the training courses Application Registration Qualification Designation Designation Governor Minister of Land, Infrastructure and Transport Minister of Land, Infrastructure and Transport Minister of the Environment Specified inspection agency Operation and maintenance Desludging Annual legal examination Johkasou operator Maintenance vendor Desludging vendor Qualification Application Registration Application Approval Minister of the Environment Governor or Mayor Municipal Mayor
12 Johkasou Technicians and Vendors on Johkasou Business Classification Johkasou operator Johkasou installation worker Johkasou inspector Johkasou desludging technician Vendor for johkasou O&M Vendor for johkasou desludging Specified examination agency Johkasou manufacturer Number of person/vendor 63,104 77,728 2,533 14,205 9,087 4,
13 Reuse of Effluent and Sludge Domestic Wastewater Johkasou Sludge Effluent can be used for: *Flushing toilet *Watering *Car washing *Firefighting Effluent Storage Tank Effluent Sludge can be for Compost
14 Comparison of Different Subsidy Programs (For installing a johkasou of 5 NUD, which will cost 860,000 if it is not subsidized) In the case of Johkasou Installation Promotion Program: Amount subsidized by municipalities and the government( 340,000) Amount borne by the house owner ( 520,000) In the case of Johkasou Installation Program in Specified Areas: Sewerage works construction bond ( 480,000) Amount subsidized by government funding ( 290,000) Amount borne by the house owner( 90,000)
15 Toward the Water Quality Protection in Public Water Bodies and the Creation of Desirable Water, Reuse of Effluent and Sludge
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