WasteWater Operator Certification Study Guide Grade 1

WasteWater Operator Certification Study Guide Grade 1 WasteWater Sources & Characteristics: 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 Basic WasteWater Treatment: Septic conditions are caused by Ans- anaerobic bacteria Basic WasteWater Treatment: Scum is usually removed in the _____treatment stage Ans- primary Basic WasteWater Treatment: When domestic wastewater enters natural waters, what species deplete most of the oxygen Ansaerobic bacteria Basic WasteWater Treatment: Once the oxygen is depleted in a natural body of water, which organisms take over? Ans- anaerobic Basic WasteWater Treatment: The major gas produces by anaerobic decomposition is Ans- methane Wastewater Treatment Facilities: Another name for promary treatment is Ans- sedimentation Wastewater Treatment Facilities: Digester gas is_______when mixed with air the the proper proportions Ans- extremely explosive Wastewater Treatment Facilities: A pond that is used to treat raw wastewater is called Ans- a waste stabilization pond Wastewater Treatment Facilities: A pond that has an aerobic top layer and an anaerobic bottom layer is called Ans- a facultative pond Preliminary Treatment: What is the angle of the bars on a manually cleaned bar screen? Ans- 30 degrees Preliminary Treatment: What is the angle of the bards on a mechanically cleaned bar screen Ans- 45-60 degrees Preliminary Treatment: What is the ideal wastewater velocity in FPS through a screen channel? Ans- 1.5ft/s Preliminary Treatment: What is the ideal wastewater velocity in FPS for grit removal in a grit chamber Ans- 1.0 ft/s Preliminary Treatment: In general, what is the water content of screen ma