Wastewater Operator Certification Study Guide Grade 1: Questions & Answers: Updated Solution

What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? (Ans- storm events Wastewater Sources & Characteristics: Combined wastewater is defined as (Ans- sanitary wastewater and stormwater runoff Wastewater Sources & Characteristics: In general, the solids content in wastewater is about (Ans- 0.1% Wastewater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of solids (Ans- 30% Wastewater Sources & Characteristics: Generally, the % of dissolved solids in the amount of total solids is about (Ans- 70% Wastewater Sources & Characteristics: Which type of organisms would most probably be associated with poor treatment or young biomass (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 (Ans- stalked cilates Basic Wastewater Treatment: Aerobic bacteria will reproduce and live in an environment that contains only (Ans- oxygen Basic Wastewater Treatment: Anaerobic bacteria will reproduce and live only in an environment that completely lacks (Ans- free or dissolved oxygen Basic Wastewater Treatment: The biochemical oxygen demand (BOD) test usually has a specific time of (Ans- 5 days Basic Wastewater Treatment: An Imhoff cone measures (Ans- volume of settleable solids