Abstract
Solid-state nuclear magnetic resonance (NMR) spectroscopy was used to elucidate the composition of total organic carbon (TOC) in fresh and composted municipal solid waste (MSW) samples and to estimate the behavior of composted MSW after landfilling. We showed that the cross polarization magic angle spinning (CPMAS) technique provided 13C NMR spectra of MSW with representative intensity distribution, whereas O-alkyl carbon was underestimated in the single pulse excitation experiment. Fresh MSW was dominated by signals in the O-alkyl C region that are derived most probably from carbohydrates. Signals assignable to plastics could also be identified. The presence of plastics was confirmed by dipolar dephased (DD) and proton spin relaxation editing (PSRE) 13C NMR spectra. During composting, the intensity of O-alkyl C decreased, while that of signals from plastics increased. This indicates a decrease of the biodegradable fraction and of the landfill emission potential. As estimated from a PSRE subspectrum, the ...
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