Wastewater sludges pretreated by different oxidation systems at mild conditions to promote the biogas formation in anaerobic processes
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The effect of different oxidation processes at mild conditions including the coupled-Fenton (sono-Fenton, photo-Fenton, and sono-photo-Fenton) and their blank systems (ultrasound, ultraviolet, zero valent iron, and Fenton) on anaerobic digestion of the sludge for biogas production was investigated. Ultrasounds led to the highest organic matter solubilization (3.8 up to 5.2 g chemical oxygen demand (COD)/L, for the raw and treated sludge, respectively), while for the rest, organic matter transformation was observed resulting in an almost soluble COD net balance. Results indicated that for the most oxidative processes, the released organic matter was probably mineralized by the hydroxyl radicals produced during the treatments. It is interesting to remark that even if the biochemical methane potential was barely enhanced by the different methods applied, all the methods demonstrated to enhance the overall kinetics of the biomethanation processes, increasing the rapidly biodegradable fraction of the sludge.
KeywordsAdvanced oxidation processes Wastewater sludges Biogas formation
Financial supports of the Regional Government of Madrid provided through project S2013/MAE-2716-REMTAVARES-CM cofinanced with structural funding of the European Community are acknowledged. DP acknowledges the Spanish MEC for the funding through a postdoctoral fellowship. This work has also been financed through the project funded by Spanish Ministry of Economy and Competitiveness (MINECO), in the frame of the collaborative international consortium WATERJPI2013—MOTREM of the Water Challenges for a Changing World Joint Programming Initiative (Water JPI) Pilot Call.
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