Wastewater Disinfection and Effluent Questions
Disinfection is on California’s Grade I and II wastewater exams and in Texas’s Class D criteria, together with effluent disposal and an introduction to advanced treatment.
100 questions across the published subjects, with a score for every area and an explanation for every option.
Or try the free disinfection and effluent drill- 27 original disinfection and effluent questions, every option explained
- Tested on 6 of our 25 practice exams
What is the purpose of post-aeration (such as cascade steps) before discharge?
What our disinfection and effluent questions cover
- Why and where effluent is disinfected
- Chlorine demand, chloramines and contact tanks
- Dechlorination and residual limits
- UV lamps, sleeves and suspended solids
- Nutrients, tertiary filtration, post-aeration, reuse and land application
This list is our own summary, written for practice. The exam owners publish their outlines: California’s Expected Range of Knowledge, TCEQ’s Need-to-Know Criteria and WPI’s Need-to-Know Criteria.
Drill disinfection and effluent, then sit a full practice exam
100 questions across the published subjects, with a score for every area and an explanation for every option.
Or try the free disinfection and effluent drillIdeas the questions test most
- Ammonia in effluent forms chloramines.
- Sodium bisulfite or SO2 dechlorinate.
- Clean UV sleeves to keep the dose.
- Nutrients feed algae blooms downstream.
Start the free disinfection and effluent drill · TCEQ Class D Wastewater practice test · California Wastewater Grade I practice test · California Wastewater Grade II practice test · TCEQ Class C Wastewater practice test · Wastewater Treatment Class I practice test · Wastewater Treatment Class II practice test
Common questions
Why dechlorinate effluent?
Chlorine residual is toxic to fish and other aquatic life, so many permits limit total residual chlorine.
What weakens UV disinfection?
High suspended solids that shield organisms, fouled quartz sleeves and aging lamps.
100 questions across the published subjects, with a score for every area and an explanation for every option.
Or try the free disinfection and effluent drillMore operator topics
Outlines used for these questions: Expected Range of Knowledge, Drinking Water Treatment Exam (rev. 4/2020, PDF) · Expected Range of Knowledge, Drinking Water Distribution Exam (rev. 4/2020, PDF) · TCEQ: Need-to-Know Criteria for public water system operators · TCEQ: What applicants for wastewater licenses need to know · WPI: 2025 Need-to-Know Criteria.
Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.