Hello revots
So what made you want to try Environmental? Since this is self-study, is there a particular specific area that interests you (air, water, waste, soil, energy)? Would you want to include you electrical background in it?
The following are books that I used previously in class, read, referenced and/or currently going through:
Boeker, E. and Grondelle, R. (1999). Environmental Physics. (2nd ed). New York, NY: John Wiley & Sons, Inc.
Crites, R. and Tchobanoglous, G. (1998). Small and Decentralized Wastewater Management Systems. Boston, Ma: WCB/McGraw-Hill.
Farber, D. and Findley, R. (2010). Environmental Law in a Nut Shell (8th ed.). St. Paul, MN: Thomas Reuters.
Manahan, S. (2001). Fundamentals of Environmental Chemistry (2nd ed). Boca Raton: Lewis Publishers.
Nazaroff, W. and Alvarez-Cohen, L. (2001). Environmental Engineering Science. New York: John Wiley & Sons, Inc.
Perk, M. (2006). Soil and Water Contamination: From Molecular to Catchment Scale. New York, NY: Taylor & Francis.
Roberson, J., Cassidy, J., and Chaudhry, M. (1998). Hydraulic Engineering. (2nd ed.). New York, NY: John Wiley & Sons, Inc.
Weiner, R. and Mathews, R. (2003). Environmental Engineering. (4th ed). New York: Butterworth-Heinemann.
Wright, D. A. and Welborn, P. (2002). Environmental Toxicology. New York, NY: Cambridge University Press.
Vesilind, P., Morgan, S., and Heine, L. (2010). Introduction to Environmental Engineering. (3rd ed.) Stamford, CT: Cengage Learning.
I hope this helps.