they also generate a lot of wastewater—as much as 5 gallons for every gallon of filtered water, the EPA says. For lead, chlorine, and other contaminants, standard under-sink filters that meet ...

(1988) Trickling filter/solids contact performance with rock filters at high organic loadings. J. Water Pollution Control Fedn. 60(1), 68–76. Metcalf & Eddy (2002) Wastewater engineering: treatment ...

BEIJING, Jan. 8 (Xinhua) -- Scientists have developed an innovative filter membrane that offers new possibilities for treating high-salinity wastewater. The study, conducted by researchers from ...