Portal de Periódicos da CAPES

Nitrogen mineralisation and greenhouse gas emission from the soil application of sludge from reed bed mineralisation systems

2017; Elsevier BV; Volume: 203; Linguagem: Inglês

10.1016/j.jenvman.2017.07.042

1095-8630

Beatriz Gómez‐Muñoz, Johnny Larsen, Georgios Bekiaris, Charlotte Scheutz, Sander Bruun, Steen Nielsen, Lars Stoumann Jensen,

Soil and Unsaturated Flow

A sludge treatment reed bed system (STRB) is a technology used for dewatering and stabilising sewage sludge via assisted biological mineralisation, which creates a sludge residue suitable for use as fertiliser on agricultural land. We evaluated the effect of sludge residue storage time (stabilisation time) for three STRBs on soil N mineralisation and CO2 and N2O emissions in soil. The experiment revealed that the N mineralisation rate and emissions of CO2 and N2O decreased as a function of treatment time in the STRBs. Mixed sludge residue (sludge residue subjected to different treatment times) for the three STRBs resulted in N mineralisation rates similar to the sludge residue subjected to a shorter treatment time but lower N2O emissions similar to the values of the older sludge residue. This finding reveals that combining fresh and more stabilised sludge residue ensures high N availability and reduces N2O emissions when applied to land.