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Wastewater Operator Certification Study Guide Grade 1 Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What type of bacteria requires oxygen to survive and treat wastewater? Aerobic bacteria What is the main purpose of a primary clarifier? To settle out suspended solids and reduce organic load What is the main purpose of secondary treatment? To biologically remove dissolved and colloidal organic matter What is the typical pH of raw wastewater? Between ...

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Master the essentials of wastewater treatment and pass your Grade 1 Operator Certification Exam with this reliable 2025 study guide. Covers treatment processes, safety, equipment operations, regulations, and key terminology — perfect for entry-level operators and trainees preparing for state certification.

WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? - ANSWER - storm events WasteWater Sources & Characteristics: Combined wastewater is defined as - ANSWER -sanitary wastewater and stormwater runoff WasteW