# First Appraisal of Effective Microplastics Removal from the Textile Manufacturing Processes
## 3 Results
### By-Product Characterization
#### 3.2.3 Solid Characterization  
When analyzing the different dried solid samples (Table 3), different compounds were detected, confirming the presence of MPs. In the dried solids from S1, 2,4-dimethyl-1-heptene was detected, so polypropylene may be present. Polyester may be present due to the presence of styrene, benzene and cyclohexane, 1,3,5-triphenyl. However, this cannot be confirmed as no further pyrolyzed compounds appear to confirm the presence of polyester. Also, cyclohexane, 1,3,5-triphenyl- had a low match. Cyclopentanone also appeared, which may be due to nylon-6,6 (low match).  
Solids from sample S2 displayed polypropylene, due to the presence of 2,4-dimethyl-1-heptene. Although benzene and styrene appeared, it is not certain that polyester was present as cyclohexane, 1,3,5-triphenyl and other pyrolyzed compounds did not appear.  
The solids derived from treatment of S3 contained 2,4-dimethyl-1-heptene, so polypropylene might be present. In addition, peaks corresponding to alkenes were observed  
\begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{3}{c}{**Solid S1\({}_{\text{out}}\)**} \\ \hline
**Compound** & **CAS** & **Characteristic ions m/z** & **Match** \\ \hline Benzene & 71-43-2 & 50, 51, 77, 78 & 790 \\ \hline Cyclopentanone & 120-92-3 & 41, 55, 84 & 714 \\ \hline
2,4-Dimethyl-1-heptene & 19549-87-2 & 43, 55, 70, 83 & 887 \\ \hline Styrene & 100-42-5 & 51, 78, 104 & 888 \\ \hline Cyclohexane, 1,3,5-triphenyl- & 117-81-7 & 149, 167 & 666 \\ \hline Bis(2-ethylhexyl) phthalate & 117-81-7 & 149, 167 & 665 \\ \hline \multicolumn{3}{c}{**Solids S2\({}_{\text{out}}\)**} \\ \hline
**Compound** & **CAS** & **Characteristic ions m/z** & **Match** \\ \hline Benzene & 71-43-2 & 50, 51, 77, 78 & 805 \\ \hline Styrene & 100-42-5 & 51, 78, 104 & 834 \\ \hline Bis(2-ethylhexyl) phthalate & 117-81-7 & 149, 167 & 820 \\ \hline
2,4-Dimethyl-1-heptene & 19549-87-2 & 43, 55, 70, 83 & 895 \\ \hline Toluene & 108-88-3 & 91,92 & 708 \\ \hline \multicolumn{3}{c}{**Solids S3\({}_{\text{out}}\)**} \\ \hline
**Compound** & **CAS** & **Characteristic ions m/z** & **Match** \\ \hline Benzene & 71-43-2 & 50, 51, 77, 78 & 886 \\ \hline Toluene & 108-88-3 & 91, 92 & 773 \\ \hline
2,4-Dimethyl-1-heptene & 19549-87-2 & 43, 55, 70, 83 & 842 \\ \hline Styrene & 100-42-5 & 51, 78, 104 & 843 \\ \hline
1-Eicosene & 01-07-3452 & 43, 55, 69, 71, 83, 97 & 830 \\ \hline Bis(2-ethylhexyl) phthalate & 117-81-7 & 149, 167 & 676 \\ \hline \multicolumn{3}{c}{**N\({}_{\text{out}}\)**} \\ \hline
**Compound** & **CAS** & **Characteristic ions m/z** & **Match** \\ \hline Benzene & 71-43-2 & 50, 51, 77, 78 & 798 \\ \hline
2,4-Dimethyl-1-heptene & 19549-87-2 & 43, 55, 70, 83 & 919 \\ \hline Styrene & 100-42-5 & 51, 78, 104 & 709 \\ \hline Benzene, 1-ethyl-3-methyl- & 620-14-4 & 120, 105 & 703 \\ \hline Bis(2-ethylhexyl) phthalate & 117-81-7 & 149, 167 & 913 \\ \hline \hline \end{tabular}
\end{table}
Table 3: MPs characterization in solid samples collected after the ASEC depruation of the textile effluents.  
as 1-eicosene, although the typical profile of polyethylene was not observed. Therefore, the presence of polyethylene in the sample was not guaranteed.  
Solids obtained from the treatment of the N sample showed 2,4-dimethyl-1-heptene in the chromatogram, indicating the presence of polypropylene. Polyester may be present due to the presence of styrene, benzene and 1-ethyl-3-methyl. However, this cannot be confirmed due to no further pyrolyzed compounds appearing to confirm the presence of polyester, and the matches were low.  
The sulfate content and the concentrations of surfactants are summarized in Table 4. All the original samples contained a significant number of sulfates (above 200 mg/L). However, the ASEC treatment removed the sulfate ions (<25 mg/L). Detergents were present in all the input samples, but the output liquid samples did not present with surfactant concentrations.