id&qtp&qim&qil&qtx&qca&qia&qrm&qnxt&qprv&qalb&subj&wght&pts&flr&ded&layout&qfixed&qptsbyans&flags
weatsamp.001&mcs&0&N&The best way to tell when enough solids have been withdrawn from a primary tank is to:&note the consistency of the solids by sampling from the pump discharge line&measure the gas production in the digester;time the operation of the supernatant pump;check volatile acids in the settling tank;&&&&a&undefined.0&&&&&1:v&&&N.
weatsamp.002&mcs&2&N&Compute the lagoon’s detention time. <BR>
;<blockquote><i>Data:</i>
;	Surface area = 6 ac
;	Average depth = 3 ft
;	Average daily flow (influent) = 0.25 mgd
;	1 ac = 43,560 ft<sup>2</sup>
;	1 ft<sup>3</sup> = 7.48 gal
;</blockquote>
;&24 d&3 d;10 d;18 d;28 d;&&&&a&undefined.0&&&&&1:v&&&N.
weatsamp.003&mcs&2&N&Sulfide producing bacteria are _____.   
;&Strict anaerobes&Heterotrophic;Aerobic;Thermophilic;&&&&a&undefined.0&&&&&4:v&&&N.
weatsamp.004&mcs&2&N&Per NPDES permit requirements, two BOD tests are required to be run on the effluent each week.  Given the results listed below, what two numbers would you reports for your Discharge Monitoring Report for that month?  <blockquote>
;	<i>BOD Results:</i>
;	Week 1 - 11 mg/L and 14 mg/L
;	Week 2 - 14 mg/L and 20 mg/L
;	Week 3 - 12 mg/L and 18 mg/L
;	Week 4 - 17 mg/L and 14 mg/L
;</blockquote>&15 and 20	&11 and 20;12 and 12;12 and 18;16 and 18;&&&&a&undefined.0&&&&&1:v&&&N.
weatsamp.005&mcs&2&N&If adding sodium bicarbonate to an anaerobic digester for pH control, care should be taken not to overdose because ___________.  &sodium toxicity can result&pH may spike above 12.0;calcium carbonate can precipitate and cause problems;CO2 will be consumed and can result in a vacuum in the tank;&&&&a&undefined.0&&&&&3:v&&&N.