Physico-chemical study of raw wastewater from Outat El Haj city, MoroccoHassan Ech-Chafay, Mohamed Najy, Fatima Zahra Talbi, Abdellatif Elghazouany, Mohamed Lachhab and Driss BelghytiE3S Web Conf., 234 (2021) 00022DOI: https://doi.org/10.1051/e3sconf/202123400022