Anaerobic degradation of nonylphenol mono- and diethoxylates in digestor sludge, landfilled municipal solid waste, and landfilled sludge

The aim of this study was to investigate the extent to which anaerobic dige stor sludge, landfilled sludge, and landfilled municipal solid waste (MSW) degrade NPEOs under methanogenic conditions. NPEO1 and NPEO2 (NPEO1-2), use d in;a mixture, were chosen as model compounds. Anaerobic experimental bott les were amended with 100% digestor sludge at three different concentration s of NPEO1-2: 2, 60, and 308 mg L-1. [U-C-14]-NPEO1-2 was used to detect an y possible decomposition of the aromatic moiety of the NPEO1-2. All inocula tes used degraded NPEO1-2 at 2 mg L-1, with nonylphenol (NP) forming the ul timate degradation product. The NP formed was not further degraded, and the incubations with labeled NPEO showed that the aromatic structure remained intact. Both landfill inoculates also transformed NPEO1-2 at 60 mg L-1. CH4 production was temporarily hampered in bottles with MSW landfill inoculum at 60 and 308 mg L-1. With 2 mg L-1 of NPEO, CH4 production closely followe d that in the controls. Both NP and NPEO1-2 interacted with the organic mat ter which resulted in sorption to the solid phase.