Biofilm-Induced Critical Flux in Dead-End Ultrafiltration Processes: Phenomenon, Mechanism, and Economic and Environmental Benefits

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

The concept of critical flux, introduced by R.W. Field, defines the flux below which filtration resistance remains constant over time. Notably, this concept, originally for cross-flow filtration, faces challenges in dead-end (the dominant mode used drinking water ultrafiltration (UF)). Herein, leveraged regulated membrane biofilms, we proposed a novel biofilm-induced specific to filtration. Below biofilm could act like maintain mass balances biodegradation foulants, thereby preventing continuous increase resistance. Additionally, demonstrated an optimized strategy improve flux─backwashing without air scouring, doubled from 6 12 L·m–2·h–1. A life cycle analysis revealed that operating at can reduce energy consumption and minimize cleaning, effectively lowering overall costs (52%) carbon emissions (61%) compared conventional UF. Sensitivity also indicated extending reducing were crucial costs, while minimizing fossil usage was decisive emissions. Overall, our study demonstrates offers low-maintenance, cost-effective, environmentally sustainable

Язык: Английский

Regional Integration and Urban Green and Low-Carbon Development: A Quasi-Natural Experiment Based on the Expansion of the Yangtze River Delta Urban Agglomeration

Sustainability, Год журнала: 2025, Номер 17(8), С. 3621 - 3621

Опубликована: Апрель 17, 2025

In the context of high-quality economic development, empowering effect regional integration policies on urban green and low-carbon development has significantly strengthened, playing a crucial strategic role in achieving coordinated economy ecology. This study uses expansion Yangtze River Delta agglomeration as quasi-natural experimental scenario, analyzing pathways mechanisms through which influence based panel data from Chinese cities between 2004 2022, using multi-period Difference-in-Differences (DID) model. The empirical results show following: ① Regional enhance efficiency conclusion that remains robust after series robustness tests, including PSM-DID estimation, placebo instrumental variable methods, indicator reconstruction, policy interference exclusion. ② Mechanism tests reveal mainly drive transformation three channels: innovation investment, industrial upgrading, talent aggregation. ③ Heterogeneity analysis indicates positive impact is more significant eastern regions, resource-based cities, small medium-sized old cities. Spatial spatial spillover transformation. Based these findings, it recommended that, future, global efforts should be made to continuously improve collaborative governance system, strengthen multi-dimensional linkage agglomerations, build support framework drives optimizes allocation factors. not only provides for enhancement but also offers decision-making references promoting growth digital era.

Язык: Английский