## 2 Microplastics and Microfibres in WWTPs
### Microfiber Occurrence in WWTPs
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Induced Winter (\%/key)**} & \multicolumn{2}{c}{**Induced**} & \multicolumn{2}{c}{**Efficient**} & \multicolumn{2}{c}{**MMP Forensel (\%)**} & \multicolumn{2}{c}{**MMP Forensel (\%)**} & \multicolumn{2}{c}{**Efficient**} \\ \cline{2-11}  & **(MP/L)** & **\%.MPFs** & **(MP/L)** & **(MP/L)** & **(MP/L)** & **\%.MPFs** & **(MP/L)** & **(MP/L)** & **(MP/L)** \\ \hline \multirow{4}{*}{**Amstatio**} & W1.3 \(\times\) 10\({}^{9}\) & W2.144 & - & - & 1 & W1.5 & W1.2 & - & - & W1.3 \(\times\) 10\({}^{9}\) \\  & W2.2 \(\times\) 10\({}^{9}\) & W2.240 & - & - & W2.048 & W2.50 & W2.04 & - & - & W2.4 \(\times\) 10\({}^{9}\) \\  & W2.3 \(\times\) 10\({}^{9}\) & W2.20 & - & W2.05 & W3.86 & W3.03 & W3.24 & - & - & W3.3 \(\times\) 10\({}^{9}\) \\ \cline{2-11}  & W1.3 \(\times\) 10\({}^{9}\) & W1.3 & W1.77 & W1.08 & W1.67 & W1.02 & W1.08 & W1.08 & W1.08 \(\times\) 10\({}^{9}\) & W1.16 \(\times\) 10\({}^{9}\) \\  & W2.6 \(\times\) 10\({}^{9}\) & W2.98 & W2.16 & W2.09 & W2.85 & W2.05 & W2.05 & W2.08 & W2.09 & W2.52 \(\times\) 10\({}^{9}\) \\  & W2.5 \(\times\) 10\({}^{9}\) & W2.55 & W2.01 & W2.27 & W3.09 & W3.72 & W3.06 & W3.76 & W3.04 \(\times\) 10\({}^{9}\) & W3.95 \(\times\) 10\({}^{9}\) \\ \cline{2-11}  & 4.8 \(\times\) 10\({}^{9}\) & 11.80 & 35.6 & 4.20 & 2.76 & 57.8 & 1.60 & 61.9 & 2.0 \(\times\) 10\({}^{9}\) & \(7.5\times\) 10\({}^{9}\) \\ \hline \multirow{2}{*}{**Caus**} & 4.9 \(\times\) 10\({}^{9}\) & 31.1 & 69.1 & 21.5 & 6.5 & 60 & 0.3 & 88.6 & 1.5 \(\times\) 10\({}^{9}\) & 2.5 \(\times\) 10\({}^{9}\) \\  & 8.8 \(\times\) 10\({}^{9}\) & - & - & - & 1.76 & 82 & 1.44 & - & - & 12.5 \(\times\) 10\(  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Trended Winter [\(\times\)1/2/20]**} & \multicolumn{3}{c}{**Influent**} & \multicolumn{3}{c}{**Efirmed**} & \multicolumn{3}{c}{**MTP Removal (\%)**} & \multicolumn{3}{c}{**Number ofMPs per Day**} \\ \hline  & **Off-U3** & **No-MPs** & **diff-FDU** & **Off-U3** & **+ MM-F  
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Trended Winter (\(\infty\)/dsp)**} & \multicolumn{3}{c}{**Influent**} & \multicolumn{3}{c}{**Effected**} & \multicolumn{3}{c}{**MMF Removal (\%)**} & \multicolumn{3}{c}{**Number of MMFs per Day**} & \multicolumn{1}{c}{**References**} \\ \hline  & **(Off-to)** & **\% MMFs** & **diff-to-1** & **diff-to-1** & **off-to-1** & **off-to-1** & **off-to-1** & **off-to-1** & **off-to-1** \\ \hline \multirow{2  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Influent**} & \multicolumn{2}{c}{**Allfluent**} & \multicolumn{2}{c}{**MYP Removal (\%)**} & \multicolumn{2}{c}{**Number of MYPs per Day**} & \multicolumn{2}{c}{**References**} \\ \cline{2-11}  & **(MHz/Hz)** & **5.3 MPs** & **different/Hz/Hz** & **(MHz/Hz)** & **\% MYPs** & **different/Hz/Hz** & **(MHz/Hz)** & **(MHz/Hz)** \\ \hline \hline \multirow{3}{*}{Swollen} & 6.5 \(\times\) 10\({}^{9}\) & 2.74 & 73.9 & 2.02 & 0.08 & 92.9 & 0.91 & 55.0 & 1.3 \(\times\) 10\({}^{9}\) & 59 \(\times\) 10\({}^{9}\) & [116] \\  & 3.7 \(\times\) 10\({}^{9}\) & 533 & - & - & 4 & - & - & - & - & [111] \\  & 5.2 \(\times\) 10\({}^{9}\) & 151 & 70.9 & 10.7 & 0.08 & 50 & 0.00 & 99.9 & 5.5 \(\times\) 10\({}^{9}\) & 21 \(\times\) 10\({}^{9}\) & [112] \\ \hline \multirow{3}{*}{Trained} & 1.3 \(\times\) 10\({}^{9}\) & 12.2 & 64.7 & 5.7 & 2.0 & 50 & 1.0 & 82.5 & 7.3 \(\times\) 10\({}^{9}\) & 1.3 \(\times\) 10\({}^{9}\) & [113] \\ \hline \multirow{3}{*}{Trained} & W1: 18.3 & W1: 25.3 & W1: 54.8 & W1: 14.5 & W1: 70.0 & W1: 44.4 & W1: 11.1 & W1: 78.6 & W1: 27.5 \(\times\) 10\({}^{9}\) & W1: 57.5 \(\times\) 10\({}^{9}\) & [114] \\  & W2: 9.6 & W2: 25.4 & W2: 57.7 & W2: 25.6 & W2: 41.1 & W2: 86.3 & W2: 56.9 & W2: 82.7 & W2: 31.5 \(\times\) 10\({}^{9}\) & [114] \\ \hline \multirow{3}{*}{Trained} & W1: 1.5 \(\times\) 10\({}^{9}\) & W1: 2.8 & W1: 46 & W1: 18.5 & W1: 16 & W1: 41 & W1: 0.66 & W1: 46.3 & W1: 2.8 \(\times\) 10\({}^{9}\) & W1: 99 \(\times\) 10\({}^{9}\) \\  & W2: 4.3 \(\times\) 10\({}^{9}\) & W2: 3.5 & W2: 59.6 & W2: 58.6 & W2: 58.6 & W2: 58.6 & W2: 57.2 & W2: 1.5 \(\times\) 10\({}^{9}\) & W2: 4.2 \(\times\) 10\({}^{9}\) \\  & W2: 1.5 \(\times\) 10\({}^{9}\) & 15.3 & W2: 58.6 & W2: 58.6 & W2: 58.6 & W2: 57.2 & W2: 1.5 \(\times\) 10\({Regarding the MP concentrations found in the influent of WWTPs, there is a wide dispersion of data with reported concentrations between 0.28 and 31,400 MPs/L, with the average value being 907 MPs/L.