The Wastewater Treatment B Test Study Guide Graded A+

In a activated sludge process, the results of a mixed liquor settling test indicate that the supernatant of the mixed liquor sample is clear, but the supernatant of the plant effluent sample is turbid. These test results indicate that the problem is occurring in the {Ans: Secondary settling tank ( Clarifier)}All of the following EXCEPT ________ are damaging or irritating to the mucus membranes or lungs if inhaled: A) Ozone B) Lime Dust C) Chlorine Gas D) Carbon Dioxide E) Ferric Chloride Dust {Ans: Ozone}A 24-Hour composite sample was tested for chlorine residual and found to contain none. These results indicate that: {Ans: Residual chlorine was NOT present during the 24-hour period.}Besides disinfection, chlorination can be used in wastewater treatment process to: A) Prechlorinate influent for control of hydrogen sulfide B) Remove nitrogen by breakpoint chlorination C) Dose RAS for control of bulking or foaming D) reduce ponding in a trickling filter E) All of the Above {Ans: E) All of the above}Biomonitoring {Ans: Involves the use of aquatic life to test the toxicity of a wastewater treatment plant effluent.}A combustible atmosphere: {Ans: contains oxygen and flammable gas, vapor, or dust}