35 research outputs found
Assessment of a cu-perovskite material in a heterogeneous electro-fenton process for the degradation of organic dyes contaminants in a wide range of ph
Scaling-up of microbial electrochemical advanced oxidation processes (MEAOPs) for efficient degradation of emerging pollutants
The interactions between microalgae and wastewater indigenous bacteria for treatment and valorization of brewery wastewater
Feasibility and applicability of the scaling-up of bio-electro-Fenton system for textile wastewater treatment
Textile wastewater entering natural water bodies could cause serious environment and health issues. Bio-electro-Fenton (BEF) as an efficient and energy saving wastewater treatment technology has recently attracted widespread attention. So far, there is no research available on the scaling-up of BEF process. In this work, an innovative 20 L up-scaled BEF system was constructed for the treatment of methylene blue (MB) containing wastewater. The system was first tested in batch mode. The results showed that the system performance was majorly related to the operating parameters including initial MB concentration, catholyte pH and concentration, cathodic aeration rate, Fe2+ dosage, and applied voltage. At the optimal condition, 20 mg L-1 of MB was efficiently removed following the apparent first order kinetics. The corresponding rate constants for the decolorization and mineralization were 0.68 and 0.20 h(-1), respectively. Furthermore, MB decolorization efficiency of 99% and mineralization efficiency of 74% were observed when the hydraulic retention time was 28 h in continuous mode. This work demonstrates the scaling-up potential of BEF for recalcitrant wastewater treatment
Microbial protein production from CO<sub>2</sub>, H<sub>2</sub>, and recycled nitrogen: focusing on ammonia toxicity and nitrogen sources
Dynamic coordination of two-phase reactions in heterogeneous Fenton for selective removal of water pollutants
An innovative microbial electrochemical ultraviolet photolysis cell (MEUC) for efficient degradation of carbamazepine
Differential interactions between natural clay minerals and dissolved organic matter affect reactive oxygen species formation
Naturally occurring reactive oxygen species (ROS) are widely involved in many environmental processes. Here we investigated the ROS generation associated with the interaction between complexed natural clay minerals (CMs) and dissolved organic matter (DOM). Our results showed that among the nine chemical-reduced CMs (CR-CMs), the light brown CR-CM (CR-CM 7) generated the highest ROS via oxygenation, relying on the reactive structural Fe(II) (Fe species that can transfer electrons to oxygen) instead of total structural Fe(II) as previously reported. Moreover, DOM affected the oxygenation of CR-CMs differently. The tight interaction between DOM and CR-CM 7 formed DOM-complexed Fe, while the weak interaction between DOM and the dark gold CR-CM (CR-CM 1) and the black CR-CM (CR-CM 5) exhibited decreased efficiencies. Mechanism studies revealed that ROS were generated through three pathways but all followed a similar one-electron transfer process in the presence of DOM. We further developed a three-layer geobattery model system and demonstrated that long electron transfer driven by CR-CMs/DOM could extend ROS generation to several centimetres across the oxic-anoxic interface, even without redox switching. These findings offer new insights into CMs-involved ROS generation and associated organic matter transformation in natural environments