Morales Diaz, V. J. ., Jave Nakayo, J. L. ., & Benites Alfaro, E. . (2018). Use of coffee grind with cocoa shell as the basis for a filter to reduce lead from contaminated water from a river, Peru. Journal of Energy &Amp; Environmental Sciences, 2(2), 24–29. Retrieved from https://journals.cincader.org/index.php/eesj/article/view/38