Class C Wastewater Exam Questions and Answers Latest Update Already Passed

Class C Wastewater Exam Questions and Answers Latest Update Already Passed Clean Water Act - Answers (CWA, 1972) set maximum permissible amounts of water pollutants that can be discharged into waterways; aims to make surface waters swimmable and fishable Texas Water Code - Answers Under Chapter 26, the Texas Commission on Environmental Quality (TCEQ) has jurisdiction over the discharge of waste into or adjacent to water in the state. TCEQ can revoke your license for - Answers violating the permit, falsifies records, states misleading information on licensing application, or causes other violations. water quality fees - Answers based on plant flow, can be high as $115,000 per permit. Accidental Discharge - Answers plant has 24hrs to notify TCEQ, which may be done by phone or fax. Penalties - Answers TCEQ Water Code violation can be up to $25000 per day for each violation. Required records - Answers flow and effluent quality- 3 yrs sludge records-5 yrs DMR - Answers Discharge Monitoring Report has to be submitted to TCEQ no later than the 20th of the following month. DMR signing - Answers Operators should not sign unless a legal signatory or have written authorization from a legal signatory within your organization. preliminary treatment - Answers the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for sedimentation. coarse screens - Answers bar screen-parallel bars-manually or mechanically cleaned. Must maintain 1.0ft per second. Need to be frequently cleaned or disposed of. fine screens - Answers mechanically cleaned-less than 0.25in. two types are disc and drum. Used for pretreatment of industrial wastes. Comminutor - Answers A circular grinder designed to grind the solids coming through the screen into pieces. Cyclone grit separator - Answers enters at top angle and the flow velocity causes a spinning action, the grit is concentrated at the bottom of funnel. Centrifugal pump - Answers A non-positive displacement pump that moves a varying amount of fluid with each rotation using an impeller blade. Must be primed and most common type. Positive Displacement Pump - Answers A type of pump that uses positive pressure to move a fluid. Three types are diaphragm, screw, and piston. Keep discharge valves open always. Used to move sludge, polymers, and chemicals. sedimentation tank (Clarifiers) - Answers consists of cylindrical or rectangular tanks where settleable solids are removed by gravity. Low velocity conditions. inlet zone - Answers Where the inflow is distributed over the tank cross section and to prevent short-circuiting design flow of 1.0 MGD or less - Answers effluent weirs can provide a max of 20,000 gal/day/linear ft. wastewater bugs - Answers bacteria, protozoa, algae, and fungi wastewater stabilization ponds - Answers most common pond used in Texas, designed to be aerobic throughout its depth. 3-5ft. BOD should not exceed 35lb. BOD/acre/day Facultative lagoon - Answers aerobic on top and anaerobic on bottom, 5-8ft deep, 30 day detention time is common, removes 50% of BOD. activated sludge process - Answers Consists of "seeding" a tank of sewage with bacteria-laden sludge, pumping compressed air into the mixture and agitating for 4-10 hours. Return Activated Sludge (RAS) - Answers The settled activated sludge (biomass) collected in a final clarifier and returned to the secondary treatment process to mix with incoming wastewater. This returns a concentrated population of microorganisms back into the aeration basin.