One of the main goals in treating wastewater is to eliminate the spread of waterborne disease. The coliform test provides a means of documenting the presence of fecal matter, which is a potential source of disease. Effluents from sewage treatment facilities disinfect by use of chlorine, ultraviolet radiation, and to a small degree, ozone. Drying beds are open-air drainage systems for dewatering digested sludge. The beds are usually covered to prevent excess moisture from slowing the evaporation process and the beds are separated into individual sand-filled beds with gravel and drainage system underneath.
Processes have to be continually monitored to minimize costs.
Alternative methods must also be explored to help keep treatment facilities operating within feasible limits. A conducting medium in which the flow of current is accompanied by the movement of matter in the form of ions. Any substance that dissociates into ions when dissolved in a suitable medium or melted and thus forms a conductor of electricity. In both fixed-film and suspend solids growth systems, activated sludge is returned to the system to maintain a proper balance between the food supply and the mass of microorganisms in the system. Feasibility is the likely hood or probability of an event of process taking place.