Microplastics degradation through hydrothermal liquefaction of wastewater treatment sludge
نویسندگان
چکیده
Wastewater treatment plant sludge contains large quantities of microplastics (MPs), which is a problematic substance that impedes sustainability efforts, such as in land management. MPs are resilient to degradation, but extreme conditions, high temperature and pressure, can lead residues be used fertilizers on farmlands. Hydrothermal liquefaction (HTL) creates converting into valuable bio-crude. To this end, the current study examined resilience sewage were treated by continuous HTL operated at supercritical water conditions (400 °C, 30 MPa). extracted before after process quantified Fourier Transformation Infrared Spectroscopy (FTIR). Particles 10–500 ?m using Focal Plane Array (FPA) based micro-FTIR (FPA-?-FTIR) imaging combined with an automated analysis generated spectral image, while Attenuated Total Reflection (ATR)-FTIR was for >500 ?m. The led MP reduction approximately 76% terms number 97% mass. difference versus their accumulated mass result being smaller process. A total 18 polymer types detected slurry entering only 11 identified residual materials. No bio-crude, i.e. most favorable product composition changed considerably Polyurethane, polypropylene, polyethylene dominant polymers feedstock, polypropylene present products. findings indicate efficient reducing highly polluted from wastewater plants, leaving byproducts residuals significantly less polluted, hereby movement terrestrial environment. Thus products better suited efforts than raw material. • Thermochemical destruction WWTP studied. Microplastics applying ATR-FTIR FPA-?-FTIR technique. Microplastic process: particle Polypropylene polymers. Residual retained mostly solid residues.
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ژورنال
عنوان ژورنال: Journal of Cleaner Production
سال: 2022
ISSN: ['0959-6526', '1879-1786']
DOI: https://doi.org/10.1016/j.jclepro.2022.130383