Bio-Refinery of Organics into Value-Added Biopolymers: Exploring the Effects of Hydraulic Retention Time and Organic Loading Rate on Biopolymer Harvesting from a Biofilm-Based Process

Toxics, Journal Year: 2025, Volume and Issue: 13(3), P. 183 - 183

Published: Feb. 28, 2025

This study aimed to examine the impacts of hydraulic retention time (HRT) and organic loading rate (OLR) on alginate-like exopolymers’ (ALEs) recovery potential from a biofilm-based process. A lab-scale moving bed biofilm reactor (MBBR) was operated under different HRT (12.0, 6.0, 2.0 h) OLR (1.0, 2.0, 6.0 kg COD/m3/d) conditions. The results demonstrated that reduction in increase had remarkable effects enhancing ALE production improving its properties, which resulted yield increasing 177.8 221.5 mg/g VSS, with protein content rising 399.3 494.3 enhanced alginate purity by 39.8%, corresponding TOC concentration 108.3 157.0 ALE. Meanwhile, illustrate potentials, microbial community compositions MBBR at various operational conditions were also assessed. showed higher relative abundance EPS producers (29.86%) observed an h than 12.0 h, revealing potential. yields crucial terms resource for wastewater reclamation providing effective approach directionally cultivating ALEs.

Language: Английский

Fe-doped biochars prepared via hydrothermal treatment and low-temperature air calcination to activate peroxymonosulfate for efficient tetracycline degradation

Water Cycle, Journal Year: 2024, Volume and Issue: 6, P. 1 - 12

Published: June 21, 2024

In this study, a new sludge-based biochar loaded with Fe species (Fe/SSBC) was prepared by two-step process involving hydrothermal treatment and low-temperature air calcination, used to degrade tetracycline (TC) activating peroxymonosulfate (PMS). After 30 min reaction, more than 98% TC (50 mg/L) could be removed optimized Fe/SSBC/PMS system (k=0.166 min-1), which 2.18 times compared individual (k=0.076 min-1). Besides, it also exhibited good stabilization. Detailed characterizations revealed the effect of on Fe-O coordination surface change valence state calcination. The electron paramagnetic resonance (EPR), electrochemical analysis quenching experiments confirmed that singlet oxygen (1O2) main active substance. We further elucidated influence grafting distribution DFT calculations. Moreover, two possible pathways were proposed based LC-MS analysis. method preparing high catalytic performance carbon materials under low energy consumption has been proposed, provides strategy for sludge recycling.

Language: Английский