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)

Adsorption kinetics and surface modeling of aqueous methylene blue onto activated carbonaceous wood sawdust

<p>In this work, Sawdust was used to develop a new low-cost adsorbent and study its application to remove methylene blue dye from aqueous solution. Sawdust was calcined under air atmosphere at three different temperatures (300°C, 400°C, and 500°C) using phosphoric acid (H₃PO₄) as an activating agent. The structure, morphology, surface functions and the chemical composition of adsorbent were characterized by Fourier Transform Infrared spectra (FTIR), X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), specific surface area (BET) and Boehm method. Different operational parameters such as pH, adsorbent loading, contact time and were investigated to evaluate experimental data. The adsorption of MB on SD-300, SD-400, and SD-500 show that the pseudo-second-order and Langmuir models fitted better the experimental results of MB adsorption onto all adsorbents. The maximum capacities based on the Langmuir model were 416.7 mg.g⁻¹ for SD-300, 526.3 mg.g⁻¹ for SD-400, and 819.7 mg.g⁻¹ for SD-500. The positive values of ΔG, ΔH, and ΔS implied that the adsorption process was non-spontaneous and endothermic nature. Finally, Regeneration of the SD-500 was investigated and optimization was performed using CCD combined with RSM.</p

Synthesis and characterization of mesoporous geopolymer based on Moroccan kaolinite rich clay

International audienc

Synthesis and characterization of mesoporous geopolymer based on Moroccan kaolinite rich clay

International audienc