WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? Correct Answer: storm events WasteWater Sources & Characteristics: Combined wastewater is defined as Correct Answer: sanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: In general, the solids content in wastewater is about Correct Answer: 0.1% WasteWater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of solids Correct Answer: 30% WasteWater Sources & Characteristics: Generally, the % of dissolved solids in the amount of total solids is about Correct Answer: 70% WasteWater Sources & Characteristics: Which type of organisms would most probably be associated with poor treatment or young biomass Correct Answer: 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 Answer: stalked cilates Basic WasteWater Treatment: Aerobic bacteria will reproduce and live in an environment that contains only Correct Answer: oxygen Basic WasteWater Treatment: Anaerobic bacteria will reproduce and live only in an environment that completely lacks Correct Answer: free or dissolved oxygen Basic WasteWater Treatment: The biochemical oxygen demand (BOD) test usually has a specific time of Correct Answer: 5 days Basic WasteWater Treatment: An Imhoff cone measures Correct Answer: volume of settleable solids Basic WasteWater Treatment: Septic conditions are caused by Correct Answer: anaerobic bacteria Basic WasteWater Treatment: Scum is usually removed in the _____treatment stage Correct Answer: primary Basic WasteWater Treatment: When domestic wastewater enters natural waters, what species deplete most of the oxygen Correct Answer: aerobic bacteria Basic WasteWater Treatment: Once the oxygen is depleted in a natural body of water, which organisms take over? Correct Answer: anaerobic Basic WasteWater Treatment: The major gas produces by anaerobic decomposition is Correct Answer: methane Wastewater Treatment Facilities: Another name for promary treatment is Correct Answer: sedimentation Wastewater Treatment Facilities: Digester gas is_______when mixed with air the the proper proportions Correct Answer: extremely explosive Wastewater Treatment Facilities: A pond that is used to treat raw wastewater is called Correct Answer: a waste stabilization pond Wastewater Treatment Facilities: A pond that has an aerobic top layer and an anaerobic bottom layer is called Correct Answer: a facultative pond Preliminary Treatment: What is the angle of the bars on a manually cleaned bar screen? Correct Answer: 30 degrees Preliminary Treatment: What is the angle of the bards on a mechanically cleaned bar screen Correct Answer: 45-60 degrees Preliminary Treatment: What is the ideal wastewater velocity in FPS through a screen channel? Correct Answer: 1.5ft/s