## 1 Organic Waste Treatment Plants and Gaseous Emissions
\begin{table}
\begin{tabular}{|l|c|c|c|c|c|} \hline Limonene & 43.29/66.29 & ppb & Food waste & 2 compositing plants-Composting hall & [21] \\  & 240/368 & ppb & Food waste & 2 compositing plants-Composting hall & [22] \\  & 0.02–1.40 & mg m\({}^{-3}\) & Food waste & Composing plant-Composting hall & [13] \\  & 433–4389/178–920 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline \(p\)-Cymene & 9.00/11.57 & ppb & Food waste & 2 compositing plants-Composing hall & [21] \\  & 49/63 & ppb & Food waste & 2 compositing plants-Composing hall & [22] \\  & 64–8053–134 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline B-Myrence & 0.04–0.11 & mg m\({}^{-3}\) & Food waste & Composing plant-Composting hall & [13] \\ \hline
3-Carene & 0.007–0.03 & mg m\({}^{-3}\) & Food waste & Composing plant-Composing hall & [13] \\ \hline _Nitrogen compounds (total)_ & 1000/30000\({}^{\circ}\) & ppb & Food waste & 2 compositing plants-Compositing hall & [21] \\  & 0.00–3.42/0.00–7.11 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline _Sulphur compounds (total)_ & nd-290 & mg m\({}^{-3}\) & VFG\({}^{1}\) & Effluent of biofilter & [20] \\  & 0–79.6/0–8.1 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline Dimethyl sulfide & nd/300\({}^{\circ}\) & ppb & Food waste & 2 compositing plants-Composting hall & [21] \\  & nd-0.003 & mg m\({}^{-3}\) & Food waste & Composing plant-Composting hall & [13] \\ \hline Dimethyl disulfide & 0.001–0.004 & mg m\({}^{-3}\) & Food waste & Composing plant-Composing hall & [13] \\ \hline _Halogenated compounds (total)_ & nd-40 & mg m\({}^{-3}\) & VFG\({}^{1}\) & Effluent of biofilter & [20] \\  & 0–0.08/0 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline _Carboxylic acids_ & 0–164.7/0 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\ \hline Acetic acid & 250/0\({}^{\circ}\) & ppb & Food waste & 2 compositing plants-Composting hall & [21] \\  & 0–05.1/0.2 & mg m\({}^{-3}\) & Food waste & Composing plant-Composing hall & [13] \\ \hline Butanoic acid & 0.0005–0.14 & mg m\({}^{-3}\) & Food waste & Composing plant-Composing hall & [13] \\ \hline Furans & nd-270 & mg m\({}^{-3}\) & VFG\({}^{1}\) & Effluent of biofilter & [20] \\ \hline TOTAL VOC & 0.71–10.10 & mg m\({}^{-3}\) & Food waste & Composing plant-Composing hall & [13] \\  & 1672–6005/1178–1694 & ppb & OFMSW & Anaerobic digestion plant F/D\({}^{2}\) & [19] \\  & 612–63 & mg cm\({}^{-3}\) & OFMSW & Composing pilot scale reactor & [11] \\  & 0.08–1.4 & g C m\({}^{-3}\) & OFMSW & Composing plant (in vessel)-bofifier input & [18] \\ \hline \end{tabular} \({}^{1}\)VFG: vegetable, fruit and garden waste. \({}^{2}\)FD: fresh, non digested waste/digested waste. \({}^{3}\)Measured with gas detector tubes. nd: not detected. The symbol “-” in concentration values means the range of VOC detected. The symbol “-” in concentration values means the results of different plants or measurement areas in the same plant (see fifth column for specific locations).  
\end{table} 
Table 1: _Cont._Sulphur compounds, with a relatively low concentration, are significant for their contribution to the odor level. In fact, dimethyl sulfide and dimethyl disulfide together with carbon disulfide and methyl and ethyl mercaptan have been found in gaseous emissions from aerobic and anaerobic waste treatments. Actually, these compounds are very common in organic waste decomposition processes, originating mainly in the microbial degradation of sulphur-containing amino acids found in proteins [3,23]. Regarding nitrogen compounds, there is an important difference within values reported resulting from the analysis of samples using GC-MS (Gas Chromatography-Mass Spectrometry) and gas detection tubes, with those obtained with tubes being higher (plants studied in both cases correspond to different treatments).