secondary clarifier has a billowing homogenuos sludge throughout the tank. 30-min. settling test is good. probable cause?
hydraulic overload
filamentous bulking is occuring and the occurring and the organism is thirothrix . what is the best curative methos you should choose?
add chlorine to the RAS at a rate of 2 to 3 lbs./ 100 os MLVSS/Day
in a contact stabilization process, the purpose os stabiliozation tank is to?
assist in the effiiciency of absorbtion by the microorgansim
T or F- under oxidized mixed liquor usually has a large strong floc.
True
major cause of repeated bulking is?
high f/m loading rates, and low MCRT
pin floc. is it associated with young or old sludge?
old sludge
T or F- gas bubbles from septic conditions are usually larger than than gas bubbles from denitrification.
true
T or F- typical aeration D.O in a sludge process is about 1.0 to 3.0 PPM
true
mixed liquor becomes very dark, shiny scum is forming on the surface. the secondary clarifier is losing solids over the weirs at sporadic periods. what visual observation and test results would you expect?
Turbidity.a decreasing f/m, rising SRT, falling SVE, and low D.O.
you have poor settling with a high SVI of 700, heavy compaction: your effluent is deteriorating with pin floc, what is the cause?
MLSS overload, to many solids in system
what PPM will chlorine kill? what PPM will be least detectable by volume?
1000 PPM/ 3.5 PPM
what type of pond is used afetr a trickling filter, RBC and activated plant?
polishing pond
secondary clarifier has billowing homogenuos sludge throughout the tank. 30-min. settleability test is good f/m is good. probable cause?
hydraulic overload
you have floating sludge in your secondary clarifier/ what would be a probable cause?
denirification is occurring. (pop-ups)
if a rotometer and chlorinator malfunctions, what should be done?
check manifolds and lines.
F.A.C. states that a onthly report must be turned in by?
the 28th of each month
what would be the best solutions if you have young sludge and staggler in the effluent?
decrease wasting, mainain D.O 1-3 PPM, and maintain RAS rates to keep blanket 1-3 feet
problem: sludge clumps are rising to the surface of the primary clarifier. D.O. is dropping excessively across the clarifier. influent BOD is 150 PPM: influent SS is 165 PPM, what could possibly be the problem?
sludge is remaining to long in the clarifier
__________ may result in the breakup of the MLSS floc particles , which will appear on the surface of the secondary clarifier. settling will be poor and operating cost will increase.
