Rafael Villarroel

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It is widely known that many regions in the world have scarce water resources. In these areas the groundwater aquifers are also found to be in a critical condition as a result of overexploitation. That is why, in such regions, the reuse of wastewater is a common practice and the competent authorities undertake multiple courses of action to encourage its(More)
A pilot-scale membrane bioreactor was operated for advanced treatment of secondary effluent from a wastewater treatment plant. The performance and biomass characteristics were evaluated under two different hydraulic retention time (HRT) values (7.5 and 15 hours). The system was operated successfully without biomass purge and, after an initial phase, evolved(More)
A Multi-sectoral Systems Analysis (MSA) of the Atlanta-Chattahooche system is proposed. It has three objectives: (i) to identify the major fluxes of nitrogen (N) entering, leaving, and circulating within an urbanrural system; (ii) to quantify the benefits of implementing changes of technology in that system; and (iii) to assess the relevance, or redundancy(More)
Prismatic silver nanoparticles (PNps) were used in the surface enhanced Raman scattering (SERS) study of the antioxidant alkaloid boldine (5,6,6a,7-tetrahydro-1,10-dimethoxy-6-methyl-4H-dibenzo[de,g]quinoline-2,9-diol). Prismatic and quasi-spherical (QsNps) silver nanoparticles were synthesized and characterized by UV-Vis spectra, topographic profile (AFM)(More)
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