Analytical and statistical study of the impact of artisan activities in the period of Eid all Adha on Fez city effluents

The sewerage of fez city receives different industrial effluents (tannery,brassware,dyeing,pottery...). the district of ain nokbi includes most of the craft activities,which discharge untreated into public networks or directly to oued sebou. the space-time monitoring of physical-chemical parameters,compared to moroccan standard of rejection,reveals that the wastewaters from this district and surroundings,containing huge quantities of ss,cyanide,mineral and organic matter with variable biodegradability,and a very high metal load in chromium presented as chromium iii which can reach as average values (4009 ; 927mg.l-1) in ss,(3329 ; 1342 mgo2.l-1 ) in cod,(251.1 ; 171.7 mg.l-1) tkn,(307 ; 101 mg.l-1) in cn- and (97 ; 12 mg.l-1) cr iii respectively for p1 and p2. while statistical analysis revealed a strong positive correlation between the chemical parameters. they are opposed to the physical parameters of the (f1 * f2) cpa plan. disposing of this wastewater,either in networks or consolidations in nature can have adverse effects on the biological treatment station of fez city,also on the health of the population and the aquatic life of oued sebou. in this sense a physic-chemical pre-treatment of these effluents is a must to ensure a healthy environment in this town. © 2017,university of mohammed premier oujda morocco.