Dr. Carlos Costa has been a Permanent Teacher in the Chemical Engineering Department of the University of Salamanca, Spain, since 2001. His Ph.D. was in Chemical Engineering (1994), and he completed his postdoctoral training research in the Microbiology Department of Wageningen Agricultural University (WAU), the Netherlands (1997). He has been working in the field of aerobic biological wastewater treatment for 30 years, specializing in high-charge biological wastewater treatments and dynamic modeling. Dr. Costa has significant practical experience in working with WWTPs and waste treatment centers, in using laboratory biological wastewater treatment plants and in the elaboration of programs in the dynamic modeling of biological treatments. Also, he works in landfill leachate treatment and oleophilic bacteria for the bioremediation of petroleum spillages.