![]() ![]() ![]() Microbial electricity co-generation was verified by electrochemical characterisation and microbiome analysis using 16S rRNA V4-V5 methodology. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) on heavy metals, Direct Mercury Analysis (DMA), Liquid Chromatography Mass Spectroscopy (LC-MS/MS) on organic micropollutants, metagenomics sequencing, Scanning Electron Microscopy (SEM-EDS), and X-Ray Diffraction (XRD) indicated that a highly pure struvite-fertilizer was produced. Phosphate extracts contained ammonia and upon magnesium (Mg 2+) addition struvite crystalized. The chemical base remobilized phosphate quantitatively from iron phosphates contained in digested sewage sludge. The scale-up MECs generated renewable chemical base and co-extracted abundant species such as Na +, K +, Ca 2+, Mg 2+ and NH 4 + from wastewater. Three pilot microbial electrolysis cells (MECs) of 168 L each were constructed and installed in different municipal wastewater treatment plants (WWTPs). The implementation is confronted to a number of challenges. It refines all principle components of wastewater. The integrated bioelectric process was found of much broader utility than initially elaborated. Recently developed bioelectrochemical reactors enabled phosphate recovery from sewage sludge containing FeP. In modern wastewater treatment phosphate is concentrated 7500 times from wastewater into sludge as iron phosphate (FeP). Phosphate rock is a depleting resource and wastewater a sustainable long-term alternative for phosphorous mining. ![]()
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