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Which best describes the nitrification cycle?
? NO3 is converted to NH3 ? NH3 is converted to NO2 and then to NO3 ? NH3 is converted to NO3 and then to NO2 ? NO2 is converted to NH3 and then to NO3
Which group of bacteria are responsible for converting nitrite to nitrate?
? Facultative ? Nitrosomonas ? Nitrobacter ? Heterotrophic
Given the following data, calculate the lbs of alkalinity required for nitrification: Data: Flow = 26.5 mgd Inf TKN = 42 mg/L Eff NH3 = 0.75 mg/L 90% TKN converted to NH3 7.14 lbs Alkalinity consumed for each lb of NH3 Converted
? 8,188 lbs ? 66,276 lbs ? 6,795 lbs ? 58,465 lbs
Which adjustment will normally improve denitrification in a conventional aeration tank?
? Increase the air supply ? Increase the D.O. ? Decrease the D.O. ? Shut off the RAS
Which adjustment will normally improve denitrification in a 5-stage Bardenpho process?
? Decrease the Internal Recycle rate ? Increase the D.O. ? Decrease the RAS ? Increase the Internal Recycle rate
Given the “Fate of Phosphorus” profile, why does TP reduce through the 1st anoxic zone?
? Phosphorus is still being released ? CBOD5 uptake through denitrification ? Low aerobic conditions create Luxury P Uptake ? Nitrification causes TP to be absorbed
Given the following Ortho P data for inlet and outlet of a BNR fermentation tank, does this appear to be a problem? * Fermentation Inlet Ortho P is 7.0 mg/L * Fermentation Outlet Ortho P is 4.0 mg/L Select only one answer
? Yes: Ortho P is too low in the fermentation outlet ? Yes: fermentation outlet Ortho P should be 2 to 4 times the concentration of the inlet ? No, the fermentation tank is designed to remove phosphorus directly ? Both "a & b"
What adjustment will the VFD aerator make when ammonia values are higher than target values?
? Decrease the VFD speed ? Remain the same speed ? Shut-off the aerator ? Increase the VFD speed
What adjustment should be considered if ammonia leaving the aerobic zone is too high?
? Decreasing the oxygen input, thereby increasing denitrification, will reduce the ammonia levels ? Increasing the oxygen input will improve nitrification ? Reduce MLSS levels below 1,000 ppm ? Increase the internal recycle rate
What problems will be experienced with phosphorus removal if D.O. is present in the fermentation zone?
? No problems … P removal will be high ? P release will be high but P uptake will be low ? P release will be hindered and P uptake will be reduced ? The fermentation zone should have high D.O.