#sewage fluid
- Blackwater — An ecological and technical term designating domestic wastewater originating directly from toilets, structurally loaded with fecal matter, urine, and dangerous pathogens, requiring advanced biological treatment; in hydrology, it describes a tropical river type (blackwater river) rich in humic acids and decaying organic matter, and in old medical / veterinary pathology, it indicates severe hematuria or hemoglobinuria.