CHARACTERIZATION AND ANAEROBIC TREATMENT OF BIOLOGICAL AND PHYSICOCHEMICAL SLUDGE FROM A MOROCCAN DAIRY INDUSTRY

The physicochemical and biological sludge (PCS and BS) from a Moroccan dairy industry, constitute a source of organic matter that is ranging between 50 to 90%. The composition of this sludge is very specific because they were derived from an effluent mixture (milk, orange ...). Assessment of anaerobic digestion for treating these wastes showed the promising results in terms of methane production and organic pollution removal. Indeed, the methane yields were 5.601 and 20.79 mlSTP.gVS-1 gave respectively by BS and PCS for the maximal load (100% of substrate). The total solid and volatile solid reduction reached to 79.63 and 83.60% for BS while it reached 87.064% and 89.161% for PCS for the same load (100% of sludge)

Factorial experimental design to enhance methane production of dairy wastes co-digestion

Factorial design was used to investigate the parameters involved in co-digestion mixture of dairy wastes (from a Moroccan dairy industry) in order to improve methane production of this mixture. Indeed, evaluation of methane yield as a function of three parameters (pH, inoculum and organic load) showed the correlation between the experimental and statistical data in terms of pH 8 and inoculum 1 (constituted by sludge diluted in 1 L of basal medium of methanogenic bacteria, in addition to formic acid (5 mL L−1), propionic acid (5 mL L−1), lactic acid (5 mL L−1) and micro-nutrient (10 mL L−1)) as optimum parameters. However, a discrepancy was detected about organic load. The interaction between parameters had a positive effect on methane yield because it led to produce experimentally a maximum methane using the higher load (3.44 g VS). These results allow selecting the parameters for the improvement of methane production. Furthermore, the validity of the fitting model to describe and improve the efficiency of dairy wastes co-digestion was investigated. In addition, an abatement of 89% of volatile solids was observed and the mineral solids was increased from 4 to 7.2 g L−1, which is important of digestat value as fertilizer. Keywords: Factorial design, Co-digestion, Dairy wastes, Improvement, Methane productio

Combined Methane Energy Recovery and Toxic Dye Removal by Porous Carbon Derived from Anaerobically Modified Digestate

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