Sewage sludge as a fuel and raw material for phosphorus recovery: Combined process of gasification and P extraction

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

“…However, only 20-25% of the initial nitrogen is retained in the solid fraction (Holm-Nielsen et al, 2009;Romero-Güiza et al, 2016). Another alternative is to burn the solid fraction in order to recover the nutrients from the ashes (Amann et al, 2018;Gorazda et al, 2018). This alternative, although very attractive in terms of volume reduction of solids, implies high operating costs that makes difficult its application on an industrial scale only interesting in countries where sewage sludge incineration is mandatory (Egle et al, 2016).…”

Determination of total phosphorus in soil and sludge by an effective headspace gas chromatographic method

“…), which were highly dependent on the pH of the solution. 21,22 Because only phosphate can react with calcium oxalate to form total insoluble calcium phosphate, a proper pH in the reaction was ensure in order to achieve a complete conversion in reaction (1). Fig.…”

“…21 According to Fig. 2, we chose 60 C and 15 min as the temperature and time for reaction (1) in the rest of the study.…”

Analysis of Sewage Sludge Thermal Treatment Methods in the Context of Circular Economy

“…After sewage sludge gasification, phosphorus can also potentially be recovered from the ash (Gorazda et al, 2018). Recovery of nitrogen is not possible as it is diluted in the form of N 2 in produced syngas (Winkler, 2012).…”