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17 Nov 2019
Municipal wastewater can negatively impact receiving waterways if it is not treated properly. For each of the contaminants found in untreated (or poorly treated) wastewater, describe their effect on human health and state the primary drinking water standard set by the EPA. (Many streams and rivers that are fed by treated wastewater are used as drinking water sources for people downstream.) Use your own words. You can find the primary drinking water standards at: https://www.epa.gov/ground-water-and-drinking-water/table-regulated-drinking-water-contaminants Total coliforms Nitrate Nitrite Denitrification can occur when methanol (CH_3 OH) is added to water containing nitrate (NO_3^-) to form nitrogen gas (N_2). The chemical formula (unbalanced) is below. NO_3^- + CH_3 OH rightarrow N_2(g) + HCO_3^- + H_2 O + OH^- Balance the chemical equation. A wastewater treatment plant treats 10 MGD (millions of gallons per day) of water containing 40 mg/L NO_3^-. Methanol is added to react with the nitrate, and no nitrate is present in the effluent. The system is drawn below.
Municipal wastewater can negatively impact receiving waterways if it is not treated properly. For each of the contaminants found in untreated (or poorly treated) wastewater, describe their effect on human health and state the primary drinking water standard set by the EPA. (Many streams and rivers that are fed by treated wastewater are used as drinking water sources for people downstream.) Use your own words. You can find the primary drinking water standards at: https://www.epa.gov/ground-water-and-drinking-water/table-regulated-drinking-water-contaminants Total coliforms Nitrate Nitrite Denitrification can occur when methanol (CH_3 OH) is added to water containing nitrate (NO_3^-) to form nitrogen gas (N_2). The chemical formula (unbalanced) is below. NO_3^- + CH_3 OH rightarrow N_2(g) + HCO_3^- + H_2 O + OH^- Balance the chemical equation. A wastewater treatment plant treats 10 MGD (millions of gallons per day) of water containing 40 mg/L NO_3^-. Methanol is added to react with the nitrate, and no nitrate is present in the effluent. The system is drawn below.