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night soil
Night soil is a euphemism for human feces collected at night from cesspools, privies, etc. and sometimes used as a fertilizer. Another definition is "untreated excreta transported without water (e.g. via containers or buckets)". Night soil is produced as a result of a sanitation system in areas without community infrastructure such as a sewage treatment facility, or individual septic disposal. In this system of waste management, the human feces are collected in solid form.
The term night soil is more and more seen as a "historical term" and is being replaced by "fecal sludge".
==Waste management==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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