WASTEWATER OPERATOR CERTIFICATION STUDY GUIDE GRADE 1 2023 QUESTIONS AND ANSWERS ALREADY PASSED A+

WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? - CORRECT ANS storm events WasteWater Sources & Characteristics: Combined wastewater is defined as - CORRECT ANS sanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: In general, the solids content in wastewater is about - CORRECT ANS 0.1% WasteWater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of solids - CORRECT ANS 30% WasteWater Sources & Characteristics: Generally, the % of dissolved solids in the amount of total solids is about - CORRECT ANS 70% WasteWater Sources & Characteristics: Which type of organisms would most probably be associated with poor treatment or young biomass - CORRECT ANS amoebas WasteWater Sources & Characteristics: Which type of organisms would most probably be associated with very clear plant effluent. low BOD and low amounts of suspended solids - CORRECT ANS stalked cilates Basic WasteWater Treatment: Aerobic bacteria will reproduce and live in an environment that contains only - CORRECT ANS oxygen Basic WasteWater Treatment: Anaerobic bacteria will reproduce and live only in an environment that completely lacks - CORRECT ANS free or dissolved oxygen Basic WasteWater Treatment: The biochemical oxygen demand (BOD) test usually has a specific time of - CORRECT ANS 5 days Basic WasteWater Treatment: An Imhoff cone measures - CORRECT ANS volume of settleable solids Basic WasteWater Treatment: Septic conditions are caused by - CORRECT ANS anaerobic bacteria Basic WasteWater Treatment: Scum is usually removed in the _____treatment stage - CORRECT ANS primary Basic WasteWater Treatment: When domestic wastewater enters natural waters, what species deplete most of the oxygen - CORRECT ANS aerobic bacteria Basic WasteWater Treatment: Once the oxygen is depleted in a natural body of water, which organisms take over? - CORRECT ANS anaerobic