Water Treatment Exam Questions with Complete Solutions

Extra? - Answer-California Air Resources Board conducted a study to determine the long-term effects of air pollution on health. Their subjects were 5,000 school-age children from 12 southern California communities. Three results were clear. First, children who lived in areas with high amounts of air pollution exhibited slower rates of lung growth. Second, the children with asthma and other respiratory illnesses were affected more by the pollution than the other children. Third, school absences for respiratory illnesses related to the community study were not linked to ozone pollution. It appears that NO2 (nitrogen dioxide) and NOx (nitrogen oxides) are more important than ozone in terms of chronic effects. Health problems related to air quality emerge over time. However water-borne illnesses caused by contamination are more direct. Diseases are typically transmitted through contaminated food or water. Poor sanitation contributes to the occurrence of viral disease. Education is one of the best ways to prevent disease and infection. Water quality is often perceived as a local or regional issue, but water circulates globally and can easily spread contamination. Damage and contamination of the world's oceans is prevalent. Toxins often can't be seen in the water. The unseen risks result in health problems for those who venture into the contaminated waters. Air pollution and contamination of the water supply are not the only sources of toxic risk. For many people, the most dangerous environment may be the workplace. Today the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) are responsible for keeping workers and the general public free from health hazards by regulating their exposure to various hazards. Poor sanitation, lack of running water and storage of water are factors that contribute You would test the water for a variety of pathogens and contaminants, of course, but much of how you treated the water would depend on whether or not the source was surface water or groundwater. - Answer-Suppose you were operating a drinking water system to provide water to others. How would you ensure that the water was safe to drink? stringent (always including disinfection, for example) than those for groundwater, in which water molecules have been filtered by sediment already. - Answer-Because surface water is exposed to the atmosphere and runoff from surrounding areas and can be readily contaminated, guidelines for its treatment are more Aeration, flocculation, sedimentation, filtration, ion exchange, absorption, disinfection - Answer-Water treatment systems in the United States may use any of these processes below, and, occasionally, none at all if the source water has been determined to be historically and presently clean and clear.