Ca Grade 2 Wastewater Treatment Operator Practice Exam 1

A grab sample is most suited for these constituents? - residual chlorine A pond with a detention time of less than three days will perform similar to? - sedimentation tank An increase in the acid/alkalinity ratio for an anaerobic digester means: - Acid concentration is increasing or alkalinity is decreasing How does an activated sludge system remove watse from wastewater? - biological treatment How much dissolved oxygen should be in a conventional activated sludge system if good effluent is being produced? - 2 to 4 mg/l How often should an anaerobic digester be fed? - several times a day How often should the sludge at the bottom of the clarifier be pumped? - frequently throughout the day How will algae impact the chlorine demand in the pond effluent? - increase the chlorine demand If a primary clarifier is placed out of service, then how should a plant with at least 2 trickling filters operate the system? - operate the filters in series If the lab results show that the plant influent sample has COD of 100 mg/l and a BOD of 300 mg/l, which of the following is most likey true? - lab results appear incorrect In general, how will warmer temp affect the settlin