Wastewater Treatment Operator Class III study plan
Wastewater Treatment Operator Class III · Give each week a clear focus.
8 weeks · About 6 hours per week
Wastewater Treatment Processes and Microbiology
Diagram the complete liquid and solids process train from influent to effluent and biosolids, labeling each unit process and its purpose
Explain the roles of bacteria, protozoa, rotifers, and filamentous organisms in activated sludge, and describe what each indicates about process health
Differentiate aerobic, anoxic, and anaerobic zones and state which nitrogen and phosphorus conversions occur in each
Define BOD, COD, TSS, VSS, and nutrients, and explain how each behaves as it moves through the plant
List the key process-control variables (DO, MLSS, MCRT, F/M, SRT, wasting rate) and describe the effect of raising or lowering each one
Your checkpoint
Hand-draw an unlabeled process-train schematic from memory and score at least 80% on a self-written 30-question quiz covering microbiology and process flow.
Secondary Treatment (Activated Sludge and Fixed-Film Systems)
Calculate MCRT, F/M ratio, and sludge age from a given set of MLSS, aerator volume, and wasting data, and state whether each result is in a typical range
Interpret an SVI and describe corrective actions for filamentous bulking, pin floc, and dispersed growth
Compare activated sludge configurations (conventional, step-feed, extended aeration, oxidation ditch, SBR, MBR) by loading, detention time, and typical effluent quality
Describe the operation of trickling filters, RBCs, and MBBRs, including media, recirculation, and typical failure modes such as ponding and odor
Troubleshoot at least five common secondary-treatment symptoms (rising blanket, low DO, high ammonia, foam, turbid effluent) and match each to a likely cause and adjustment
Your checkpoint
Complete a one-page troubleshooting table linking ten secondary-treatment symptoms to causes and corrective actions, verified against your reference text, plus ten solved MCRT/F/M calculations.
Safety, Regulations, and Administration
Identify the permit limits, monitoring frequencies, and reporting deadlines that apply to a typical NPDES discharger and describe the consequence of a missed report
Explain confined-space entry, lockout/tagout, and hazardous-gas monitoring procedures, naming the gases of concern and their exposure limits
Describe the required safety practices for chlorine, sulfur dioxide, sodium hypochlorite, and digester/biogas systems, including PPE and emergency response steps
Outline the chain-of-custody and sampling requirements that make monitoring data legally defensible
Summarize operator certification, continuing education, and recordkeeping obligations under the applicable state and federal rules
Your checkpoint
Write a 15-item permit-compliance checklist for a hypothetical plant and correctly answer 90% of a 25-question safety and regulations self-quiz.
Solids Handling and Biosolids Management
Trace solids from primary and secondary clarifiers through thickening, stabilization, dewatering, and final disposition, naming the purpose of each step
Compare gravity thickening, DAF, and centrifuge thickening by typical feed and cake solids concentrations
Explain anaerobic and aerobic digestion, list the conditions that cause sour or upset digesters, and describe corrective actions
Calculate percent solids, volatile solids reduction, and dry-solids mass for a specified sludge stream
Classify biosolids by pathogen and vector-attraction reduction and match each class to acceptable end uses
Your checkpoint
Produce a solids-handling mass balance for a worked example (influent sludge mass in, cake mass out) and pass a 25-question solids-handling quiz at 80% or better.
Preliminary and Primary Treatment & Disinfection and Effluent Quality
Describe the function and operating checks for bar screens, comminutors, grit chambers, and primary clarifiers, including short-circuiting and density-current problems
Calculate hydraulic detention time, surface overflow rate, and weir loading for a primary clarifier using given dimensions and flow
Explain disinfection theory (CT concept, demand, contact time, pH effects) and compare chlorine, chloramine, UV, and ozone for strengths and limitations
Calculate chlorine dose or residual from given flow, concentration, and feed-rate data
Identify the causes of coliform exceedances and describe the required response, including resampling and notification
Your checkpoint
Solve a set of fifteen calculations spanning detention time, overflow rate, weir loading, and chlorine dose, with all work shown and at least 85% correct.
Laboratory Analysis and Process Control Testing & Collection Systems and Pumping
Perform and interpret the core bench tests: TSS, VSS, BOD, COD, ammonia, nitrate, phosphorus, pH, alkalinity, DO, and settleability, including sample handling and preservation
Explain quality-control practices (duplicates, blanks, standards, calibration) and identify what each control detects
Compute pump head, flow rate, and horsepower from given data, and read a pump curve to select an operating point
Describe collection-system components and problems: infiltration and inflow, grease, root intrusion, hydrogen sulfide corrosion, and lift-station controls
Outline cleaning, inspection, and rehabilitation methods for gravity sewers and force mains
Your checkpoint
Create a lab-method reference card for eight core tests (method, preservation, holding time, typical QC) and score 80% or better on a 20-question collection-system and pumping quiz.
Wastewater Treatment Processes and Microbiology & Secondary Treatment (Activated Sludge and Fixed-Film Systems) & Safety, Regulations, and Administration
Re-test the two heaviest domains and the regulations domain, then rank every domain by practice-quiz score to identify the weakest three
Rebuild any process train, mass balance, or troubleshooting logic that produced errors in earlier weeks
Work through multi-step word problems that combine process control, calculations, and regulatory reporting
Practice explaining process decisions aloud in the format used for oral-style exam items and certification interviews
Your checkpoint
A written weak-area log listing every missed item from weeks 1 through 6 with the corrected concept, plus proof of re-scoring at least 85% on the retaken quizzes.
Preliminary and Primary Treatment & Disinfection and Effluent Quality & Solids Handling and Biosolids Management & Collection Systems and Pumping & Laboratory Analysis and Process Control Testing
Complete two full-length timed practice exams under exam conditions and review every missed item
Drill the calculation types most often missed across all domains until each is completed correctly three times in a row
Review safety and regulatory content one final time, emphasizing gas monitoring, confined space, and reporting deadlines
Assemble a one-page formula and reference sheet to use during final review
Your checkpoint
Two completed timed practice exams with a written review of every error, and a final score of at least 80% on the second attempt.
Milestones
Week 2: Can state typical ranges for MCRT, F/M, SVI, and MLSS without notes and correctly solve three process-control calculations in a row.
Week 4: Scored 80% or higher on cumulative self-quizzes for domains 1, 3, 5, and 8, and can reproduce the full process train from memory.
Week 6: All core calculation types (detention time, overflow rate, weir loading, MCRT, F/M, solids mass, chlorine dose, pump horsepower) solved correctly at least once with work shown.
Week 8: Two full-length timed practice exams completed with the second score at or above 80% and no domain below 70%.