期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：12
页码：4582-4590
DOI：10.26872/jmes.2017.8.12.884
出版社：University of Mohammed Premier Oujda
摘要：Biological wastewater treatment involves the production of large quantities of sludge. The latter present a source of pollution for the environment hence the need for their valorisation. This work proposes their valorisation by co-composting with other substrates rich in carbon and nitrogen. The substrates used are organic household waste, poultry droppings and margins. Two types of composts were developed, one with sludge and the other one without sludge, which served as a control. Indeed, the characterization of the sludge taken from the wastewater treatment plant of the Fez city after digestion and cogeneration of other substrates shows that the sludge is black in colour, had a neutral pH, and carry a very high mineral and organic biodegradable charge and these substrates are heavily loaded with chrome. Their composition in other metals (Cu, Pb, Zn, Co, Ni, and Cd) respects the limit values recommended by the French standards. Household waste is rich in organic carbon and nitrogen. Poultry droppings are weakly basic and have average levels of nitrogen, organic carbon and organic matter. The margins are moderately acidic and rich in organic matter. The monitoring of the evolution of the composting process took place by measuring the physicochemical parameters up to the maturation phase obtained after 16 weeks for both types of compost. Maturation tests for both composts were carried out on the germination of watercress and corn by measuring the E4 / E6 ratio. The mature composts thus produced reach the standards quality of a mud and urban compost, respectively NFU 44-095 and NFU 44-051, and do not present any risk of toxicity.
