Combined Methane Energy Recovery and Toxic Dye Removal
by Porous Carbon Derived from Anaerobically Modified Digestate
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Posted on 2019-05-29 - 19:05
Valorization of agri-food organic
waste in order to reach zero
waste using cleaner methods is still a challenge. Therefore, both
anaerobic co-digestion (ACD) (biological process) and adsorption (physicochemical
process) were used in combination for this objective. ACD allows the
activation of biodegradable organic matter by microbial action and
produces a digestate (co-product). This coproduct was used as a raw
material to produce porous carbon having a high specific surface area
after chemical treatment using sulfuric acid and thermal activations
at temperature T = 350 °C. The resulted material
was used for the preparation of core–shell particles with a
core made of porous carbon and a shell consisting mainly of alginate
and a calcium ion layer. The final core–shell particles were
then used for dye treating wastewater and solving the solid–liquid
separation problem in the adsorption process. We show here that in
the ACD process, significant bio-methane potential (BMP) was produced.
Furthermore, the data indicate that 153 L CH4 kg·SV–1 of BMP was produced under optimum conditions of pH
= 8 and inoculum/load ratio = 1.2. The overall results concerning
the methylene blue (MB) adsorption from water onto the core–shell
particles show the occurrence of a maximum adsorbed amount equal to
26.178 mg g–1, and good agreement was found between
the experimental adsorption data with pseudo-second-order and Langmuir
theoretical models. The response surface methodology coupled with
the central composite design has allowed the identification of optimal
conditions for MB removal and has led to the elucidation of adsorption
mechanism and the regeneration of the adsorbent without the occurrence
of the solid/liquid separation problem.
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Anfar, Zakaria; Amedlous, Abdallah; Ait El Fakir, Abdellah; Ait Ahsaine, Hassan; Zbair, Mohamed; Lhanafi, Saaida; et al. (2019). Combined Methane Energy Recovery and Toxic Dye Removal
by Porous Carbon Derived from Anaerobically Modified Digestate. ACS Publications. Collection. https://doi.org/10.1021/acsomega.9b00524