Texas Class C Wastewater Treatment License Questions And Answers Latest 2024/2025 Graded A+.

Texas Class C Wastewater Treatment License Questions And Answers Latest 2024/2025 Graded A+. What stage of treatment is grit removal usually accomplished in? - ANSWERpreliminary treatment Rotating Biological Contactor - ANSWER-a type of biological secondary treatment process How are protozoa (cause of amoebic dysentery) destroyed? - ANSWER-disinfection Other than stream discharge, what are other ways to dispose of effluent wastewater? - ANSWER-aquifer recharge, evaporation in a pond, and application to farm land by irrigation Clean Water Act - ANSWER-gives the basic structure for regulating discharges of pollutants into the waters of the United States Texas Water Code - ANSWER-gives the TCEQ jurisdiction over discharges of waste into or adjacent to water in the state Who reviews plans and specifications for new construction projects before construction begins? - ANSWER-TCEQ Water quality fees may be as high as ____________ per permit? - ANSWER-$115,000 Administrative penalties, up to __________ per day for each violation, may be assessed against any violator. - ANSWER-$25,000 Every city with more than ________ in population needs to establish a water pollution control program and hire qualified personnel to administer it. - ANSWER-10,000 State law requires that reports are to be submitted no later than the ________th day of the following month. - ANSWER-20 What are major surface waters classified as for the purposes of water quality management and designation of site-specific standards? - ANSWER-segments Texas Class C Wastewater Treatment License Questions And Answers Latest 2024/2025 Graded A+. Inflow - ANSWER-direct discharges of storm water or surface water into a wastewater collection system (storm drains, roof gutters, yard drains, basement sump pumps and broken manholes and wastewater lines). How many gallons per day will each person contribute to the wastewater treatment plant? - ANSWER-100 How much BOD will each person contribute to the wastewater treatment plant each day? - ANSWER-0.17 Cause of septic wastewater - ANSWER-bacterial action Classifications of solids in wastewater - ANSWER-fixed/ash, suspended/dissolved, organic/inorganic Organic compounds in wastewater include - ANSWER-carbon, hydrogen and oxygen (animal and vegetable in nature) Type of organic matter present in wastewater - ANSWER-proteins BOD is a measure of what? - ANSWER-oxygen used up Ways that oxygen can be depleted in streams - ANSWER-untreated waste discharges, algae masses at night, and high BOD in the effluent A gas found in treatment systems that is NOT dangerous - ANSWER-dissolved oxygen Cycles of decay include - ANSWER-carbon, nitrogen and sulfur A flow totalizer is required when the plant design flow is more than - ANSWER-0.5 MGD Non-hazardous wastes include - ANSWER-chlorides, alkalinity, color, phosphorous and iron Hazardous wastes include - ANSWER-cyanide, sulfides, organics and gasoline Synergistic Effect - ANSWER-reaction between waste streams How many cubic feet of screenings per million gallons of wastewater will coarse screens remove? - ANSWER-0.5 to 6.0 Preaeration benefits - ANSWER-freshen wastewater, scour gases and remove grease Main purpose of sedimentation tank - ANSWER-allow scum to rise and solids to settle under quiescent (low velocity) conditions How much settleable solids is removed in primary settling? - ANSWER-90-95% How much suspended solids is removed in primary settling? - ANSWER-50-70% How much BOD is removed in primary settling? - ANSWER-35% How much total organic matter is removed in primary settling? - ANSWER-20-30% What percentage of suspended solids will settle out within 2 hours? - ANSWER-70% Required minutes of detention time for peak flow? - ANSWER-54 Required minutes of detention time for design flow? - ANSWER-108 Benefits of removing grit - ANSWER-wear on pump impellers, line stoppages and taking up space Too high a velocity in a grit chamber can result in what? - ANSWER-excess grit in primary clarifier One of the benefits of pre-aeration is - ANSWER-gas and grease removal Why does grit need to be washed? - ANSWER-because organic matter clings to it What is a flow equalization used for? - ANSWER-to reduce excessive flows or organic loads How can grease be removed before sedimentation? - ANSWER-by chlorination, aeration and skimming A primary clarifier should remove most of what? - ANSWER-settleable solids What conditions can influence settling of solids? - ANSWER-temperature, condition of solids and flow velocity Sludge from a primary clarifier should have a moisture content of what? - ANSWER-94- 96% By performing Imhoff cone tests on the clarifier inlet and outlet, the operator can determine what? - ANSWER-the efficiency of the clarifier and a sludge pumping schedule When temperature increases, water becomes... - ANSWER-less dense What problem is short-circuiting in a clarifier? - ANSWER-flow problem