The efficiency of the economic septic tank in the treatment of domestic wastewater and black water in rural areas. Research, Society and Development, [S. l.], v. 10, n. 8, p. e22910817232, 2021. DOI: 10.33448/rsd-v10i8.17232. Disponível em: https://rsdjournal.org/rsd/article/view/17232. Acesso em: 5 dec. 2025.