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Florida Wastewater License Test 2025 Prep
with Questions and Correct Verified Answers|
FL Wastewater Exam 2025 Prep | Florida
Wastewater Operator Test 2025 (Brand New!)
According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described as: A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow FDEP chapter 62-604.550 (a) FAC, requires a wastewater spill shall be verbally reported to the state warning point no later than: 24hrs from discovery What is the 'rule of thumb' regarding pump packing? Never put rings of new packing over the old packing According to FDEP chapter 62-60, FAC, a composite sample shall be used for which test? Effluent CBOD Chlorine residual can be measured in several ways, including the use of DPD reagent, spectrophotometers and iodometric titration. Which of the following is also an approved method? Amperometric Titration
Chapter 62-601, Domestic wastewater treatment plant monitoring, states that on-site tests for total residual chlorine, pH, and _______ can be performed under the direction of a certified operator: Dissolved Oxygen(DO) Starting this type of pump against a closed valve can cause major damage to the pump, pump piping, the operator, or all three Positive displacement pump These types of samples may be used for CBOD5 and nutrients at flows less than 100,000 GPD, according to chapter 62- 601 Grab samples According to FDEP chapter 62-602, drinking water and wastewater treatment plant operators, duties of operators includes reporting to the permittee and the department, as soon as possible, but within 24hrs: Any major interruption of service What could cause a centrifugal above ground pump to be noisy while running Debris caught in the impeller housing
Plant effluent coliform count fails to meet the required standards for disinfection. Chlorine residual is normal. Disinfectant supplies ARE NOT a problem. What is the probable cause? Contact time too short A fixed sample is: A sample purposely spiked by the lab technician for QA/QC According to FDEP chapter 62-602 FAC, an operator could have his license permanently revoked for: Falsified or misrepresented reports, logs, or lab sheets What process do the bacteria perform in the stabilization(re-aeration) tank in the contact stabilization process? Absorption and digestion of the waste material they collected A screenings dumpster at the head works of the treatment plant is full at the end of the day. The dumpster is 6ft tall, 10ft long, and 8ft wide. How many cubic yards of screenings must be disposed of in a 30 day month? 533 (6 x 10 x 8 = 480) (480 /27 = 17.7) (17.7 x 30 = 533) When properly adjusted, the rope packing on a centrifugal pump is designed to leak how much?
One drip per second A confined space is defined as having a space large enough to bodily enter and perform work, has limited entry and egress and is ___________? Not designed for continuous occupancy You noticed that your bearings are excessively hot on a pump, why? Over lubrication Where can you gain access for collection system maintenance? Man hole Low DO and nutrient deficiency will promote the growth of _________? Filamentous bacteria When charging a lead-acid type battery for a composite sampler, what dangerous gas could be produced? Hydrogen What is the best method in dealing with a chemical spill?
clear supernatant. MLSS test results are normal, but a calculation of the SVI shows high sludge volume index. What is the most likely cause of the high sludge blanket? Filamentous bacteria are causing the slow settling Solids are washing out of the secondary clarifier of the activated sludge plant. Plant personnel increase the Return Activated Sludge flow rate, which slows the problem temporarily, but gets worse after 30 minutes. What is the cause of the plant problem? Increasing the RAS decreased the detention time in the clarifier The chlorine residual is falling, and inspection of the 150LB cylinder and chlorine feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST method to fix the falling chlorine residual is to: Place a second chlorine cylinder online The ash content in lab procedures is the same as? Inorganic solids Denitrification will cause what? Rising sludge If a 220 volt, 3 phase motor is running backwards, what should you do? Switch the two leads
Coliform count fails to meet standards. Your chlorine supply is not the problem. What is? Short circuiting and low contact time What type of material should be used for transporting samples? Polyethylene How does temperature effect disinfection? Higher the temp, the better the disinfection The advantage of an anaerobic digester over an aerobic digester is? Decreased power consumption How long should you wait after you make a process change before making another change? 1 week The settleometer settles fairly slowly. You have shiny dark foam of the surface of the aerator. What is the problem? MCRT too high
The rock in trickling filters is placed? On system tile under drains You have an RBC unit with the following parameters: Q = 1.4MGD Sol. BOD = 100mg/L Surface Area = 500,000 s/f What is the Organic loading in Lbs per 1,000 cu/ft? 2.3 Lbs What is the disadvantage of a hypochlorinator? Increases the pH and decreases the disinfection What chemical would be used on a sample to be used for TSS test? Nothing What TSS test is most critical for plant operation TSS in air bay
What is a quick test to check sludge condition Settleometer What is the funnel called that is used along with the vacuum apparatus when doing solids testing? Büchner funnel What would be most harmful to the population of microorganisms? High toxicity, Strong acids, Strong bases What can happen if more than 40Lbs of chlorine is withdrawn from a 150Lb tank in a 24hr period? Freezing of the lines What are the two main gasses produced by an anaerobic digester? Methane and CO When working in a man hole, what would be the biggest danger? Asphyxiation In a pond, what will happen to the pH during the day time?
After removing the roof of the chlorinator storage building during the summer, the CL2 stops feeding. What is the cause? The tank got hotter than the manifold What do Total Suspended Solids consist of? Setteable and suspended The pH in your plant is decreasing, effluent turbidity is increasing, and sludge is rising in the clarifier. What is the problem? Denitrification The TSS of the digester supernatant should be calculated because? To measure the solids load on the plant How do you calculate the F/M ratio? Influent COD lbs. divided by the MLVSS lbs. If an activated sludge plant becomes upset, what is the most important and least time consuming operation an operator should do to discover the cause? Check plant data for the previous 3 weeks
A waste treatment pond that is aerobic in the upper portion while the bottom layer is anaerobic is called? Facultative pond If a pump takes 30 seconds to fill a 5-gallon bucket, what is the pumping rate in gallons per minute? 10GPM 5/ .5 minutes (30 seconds) = 10 GPM What is the most beneficial process control tool in operation of an anaerobic digester? Volatile acid to alkalinity ratio pH is measure on a scale of 0 - 14 When chlorine is combined with water, what type of pipe should be used? PVC A good settling sludge would consist of what type of protozoa?
What do total solids consist of? Settleable and non settleable What would cause excessive wear on bearings? Misalignment Amperometric titration is used to measure? Chlorine residual What growth phase is an aerobic digester operated in? Endogenous respiration If excessive pressure builds up in a chlorine tank due to excessive heat, what will prevent explosions? Fusible plug You notice that your bearings are excessively hot on a pump. Why? Over lubrication
Where can you gain access for collection system maintenance? Man hole Low DO and nutrient deficiency will promote growth of what? Filamentous bacteria Chlorine leaks can be detected by? Ammonia solution with Q-Tip What takes places in the stabilization tank in a contact stabilization plant? Absorption Why is an aerobic digester covered? Protect from cold weather Which of the following would you not use a grab sample on? BOD
80.6°F
You have excessive billowing white sudsy foam on the surface of your aerator. What is the cause? F/M too high If you have a sudden increase of BOD by 50% or a BOD >400. What is this termed? Increased organic load Coliform bacteria are used for what? Indicators of possible presence of pathogenic organisms Where does the effluent from the aerator go? Secondary clarifier A decrease in temperature will have what effect on disinfection? Require longer contact time CL2 combined with ammonia forms what? Chloramines
At what pH would disinfection be at its greatest? 5 It can be said that the lower the __________ , the greater the ________ pH ; Disinfection What is the distance between manholes? 300 - 500ft What is the best range of parameters for the Activated Sludge Process? 2ppm DO, pH 7.0, 80-95°F What is the breakdown of nitrate to nitrogen gas called? Denitrification What 2 stages are in an anaerobic digester? Acid formation and Gas formation
