Exploring the influence of hydrological indicators on flow regimes through a data-driven modeling approach in the Huai river basin, China.

Understanding the impact of hydrological indicators on flow regimes is essential for sustainable water resource management. This study presents a data-driven framework integrating eXtreme Gradient Boosting (XGBoost) with SHapley Additive exPlanations (SHAP) to quantify the influence and interactions of key hydrological indicators on annual runoff in the Huai River Basin during 1970-2020. Based on 5-fold cross-validation results, XGBoost achieved superior predictive performance with R values of 0.

Glucose as a dual-functional co-substrate in intimately coupled photocatalysis and biodegradation systems: Synergistic enhancement of refractory organics mineralization and nitrate removal.

Nitrate contamination threatens water quality and human health; however, conventional denitrification treatment strategies struggle in complex wastewater due to the low bioavailability of refractory organics. The intimately coupled photocatalysis and biodegradation (ICPB) system addresses this by transforming recalcitrant compounds into usable electron donors, enabling simultaneous nitrate and organic pollutant removal. This study demonstrates that adding a small dose of glucose (50 mg/L chemical oxygen demand) to the ICPB system enhanced performance by increasing organic mineralization from 53 % to 81 % and total nitrate and nitrite removal from 40 % to 93 %.

Transformation of dissolved organic matter during aquaculture wastewater treatment: Insights into the biological toxicity, spectral indices and molecular signatures.

China is a leading aquaculture producer globally and therefore, faces the critical challenge of effectively managing large volumes of aquaculture wastewater. In order to optimize treatment processes and evaluate the ecological risks from effluent discharge, it is important to understand the transformation of dissolved organic matter (DOM) and identify the key toxic components throughout the treatment process. This study focused on the 'three ponds, two dams, one wetland' (3P-2D-1W) treatment system, which has been widely adopted as an aquaculture wastewater treatment approach in China, investigating DOM transformation throughout the treatment process via spectroscopy, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and biotoxicity analyses.

Synergistic removal of bio-recalcitrant organic compounds and nitrate: Coupling photocatalysis and biodegradation to enhance the bioavailability of electron donors.

Nitrate pollution poses significant threats to both aquatic ecosystems and human well-being, particularly due to eutrophication and increased risks of methemoglobinemia. Conventional treatment for nitrate-contaminated wastewater face challenges stemming from limited availability of carbon sources and the adverse impacts of toxins on denitrification processes. This study introduces an innovative Intimately Coupled Photocatalysis and Biodegradation (ICPB) system, which utilizes AgPO/BiTiO, denitrifying sludge, and polyurethane sponge within an anoxic environment.

Microbial community succession and responses to internal environmental drivers throughout the operation of constructed wetlands.

Constructed wetlands (CWs) have been widely used to ensure effective domestic wastewater treatment. Microorganisms-derived CWs have received extensive attention as they play a crucial role. However, research on the succession patterns of microbial communities and the influencing mechanisms of internal environmental factors throughout entire CW operations remains limited.