Removal of heavy metal ions from wastewaters: A review

Bacterial biofilms are formed by communities that are embedded in a self-produced matrix of extracellular polymeric substances (EPS). Importantly, bacteria in biofilms exhibit a set of 'emergent properties' that differ substantially from free-living bacterial cells. In this Review, we consider the fundamental role of the biofilm matrix in establishing the emergent properties of biofilms, describing how the characteristic features of biofilms - such as social cooperation, resource capture and enhanced survival of exposure to antimicrobials - all rely on the structural and functional properties of the matrix. Finally, we highlight the value of an ecological perspective in the study of the emergent properties of biofilms, which enables an appreciation of the ecological success of biofilms as habitat formers and, more generally, as a bacterial lifestyle.

Biofilms: an emergent form of bacterial life.

Biosorbents for heavy metals removal and their future

Synthesis of metallic nanoparticles using plant extracts.

Equilibrium and kinetic studies in adsorption of heavy metals using biosorbent: a summary of recent studies.

Strategies for extracting the three-phase reference currents for shunt active power filters are compared, evaluating their performance under different source and load conditions with the new IEEE Standard 1459 power definitions. The study was applied to a three-phase four-wire system in order to include imbalance. Under balanced and sinusoidal voltages, harmonic cancellation and reactive power compensation can be attained in all the methods. However, when the voltages are distorted and/or unbalanced, the compensation capabilities are not equivalent, with some strategies unable to yield an adequate solution when the mains voltages are not ideal. Simulation and experimental results are included

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Comparison of Control Strategies for Shunt Active Power Filters in Three-Phase Four-Wire Systems

Comparative study of biosorption of heavy metals using different types of algae

Leaching of chalcopyrite with ferric ion. Part I: General aspects

Gold(III) biosorption and bioreduction with the brown alga Fucus vesiculosus.

The state of the art in the field of biosorption using algae as biomass is reviewed. The available data of maximum sorption uptake (qmax) and biomass-metal affinity (b) for Cd2 +, Cu2 +, Ni2 +, Pb2 + and Zn2 + were statistically analyzed using 37 different algae (20 brown algae, 9 red algae and 8 green algae). Metal biosorption research with algae has used mainly brown algae in pursuit of treatments, which improve its sorption uptake. The information available in connection with multimetallic systems is very poor. Values of qmax were close to 1 mmol/g for copper and lead and smaller for the other metals. Metal recovery performance was worse for nickel and zinc, but the number of samples for zinc was very small. All the metals except lead present a similar affinity for brown algae. The difference in the behavior of lead may be due to a different uptake mechanism. Brown algae stand out as very good biosorbents of heavy metals. The best performer for metal biosorption is lead.

Felisa González

Papers

Comparison of Control Strategies for Shunt Active Power Filters in Three-Phase Four-Wire Systems

Comparative study of biosorption of heavy metals using different types of algae

Leaching of chalcopyrite with ferric ion. Part I: General aspects

Gold(III) biosorption and bioreduction with the brown alga Fucus vesiculosus.

Biosorption with Algae: A Statistical Review