DIET-like and MIET-like mutualism of S. oneidensis MR-1 and metal-reducing function microflora boosts Cr(VI) reduction.

Microbial treatment of Cr(VI) is an environmentally friendly and low-cost approach. However, the mechanism of mutualism and the role of interspecies electron transfer in Cr(VI) reducing microflora are unclear. Herein, we constructed an intersymbiotic microbial association flora to augment interspecies electron transfer via functionalizing electroactive Shewanella oneidensis MR-1 with metal-reducing microflora, and thus the efficiency of Cr(VI) reduction.

Enhancing the extracellular electron transfer ability via Polydopamine@S. oneidensis MR-1 for Cr(VI) reduction.

Microbial reduction of hexavalent chromium (Cr (VI)) shows better efficiency and cost-effectiveness. However, immobilization of Cr (III) remains a challenge as there is a limited supply of electron donors. A greener and cleaner option for donating external electrons was using bioelectrochemical systems to perform the microbial reduction of Cr(VI).

Effects of enzymes on organic matter conversion in anaerobic fermentation of sludge to produce volatile fatty acids.

Sludge hydrolysis is a vital step in anaerobic digestion of sludge. This study compared the efficacy of free versus immobilized enzymes at different concentrations in promoting sludge disintegration. Pretreatment with 1,000 mg/L immobilized enzymes was more efficient in promoting sludge disintegration than free enzymes at the same concentration.

Functional sustainability of periphytic biofilms in organic matter and Cu removal during prolonged exposure to TiO nanoparticles.

Responses of microbial communities to nanotoxicity in aquatic ecosystems are largely unknown, particularly with respect to relationship between community dynamics and functions. Here, periphytic biofilms were selected as a model of species-rich microbial communities to elucidate their responses when exposed to titanium dioxide nanoparticles (TiO-NPs). Especially, the relationships between the functions (e.

Biosorption of high-concentration Cu (II) by periphytic biofilms and the development of a fiber periphyton bioreactor (FPBR).

In this study, a kind of microbial aggregates: periphytic biofilms were used for Cu removal and immobilized onto fiber for developing a novel bioreactor. Results show that periphyton can effectively entrap Cu at initial concentrations of 2-20mgL due to the overproduction of EPS and porous structure of periphyton, and biosorption was the primary mechanism of Cu removal. Cu (mainly Cu(OH), Cu(OH) and Cu) adsorption onto periphytic biofilms followed the pseudo-second order kinetic model.

[Distribution of Redox Zone at Different Water Layers in the Presence of Periphyton and the Responsible Microorganisms].

So far, many types of carriers (such as artificial mat, industrial soft carriers) have been widely used in removing pollutants, purifying water quality via the periphyton attached on the surface of these carriers. In the presence of periphyton, the distribution of redox zone at different water layers is directly or indirectly associated with the removal rate of pollutants. Therefore, it is more practically significant to study the distribution of redox zone at different water layers and the microbial diversity in the presence of periphyton.

Nutrient capture and recycling by periphyton attached to modified agrowaste carriers.

The reuse of periphytic biofilm from traditional wastewater treatment (i.e., active sludge process) is inefficient to recycle nutrients due to low accumulation of nutrients.

Periphytic biofilm: A buffer for phosphorus precipitation and release between sediments and water.

The influence of periphytic biofilm on phosphorus (P) content and species between water and sediment interfaces was evaluated in a simulated experiment. Results showed that the concentration of all P species (TP, TDP, DIP, PP, and DOP) in overlying water decreased to significantly low levels (<0.05 mg L(-1)) in the presence of periphytic biofilms, while the TP increased (>1.

Comparison of the properties of periphyton attached to modified agro-waste carriers.

Periphyton is a valuable, environmentally benign resource widely used in environmental remediation. A protocol for reusing agro-wastes to improve the metabolic activity and versatility of periphyton was tested in this study. Peanut shell (PS), decomposed peanut shell (DPS), acidified peanut shell (APS), rice husks (RHs), acidified rice husks (ARHs), and a commonly used synthetic carrier, ceramsite (C), were used to support periphyton attachment and growth.