TCEQ Wastewater (Class D) License Prep Exam Guide 2024

Minimum velocity required to keep solids in suspension? - 2ft/sec Minimum required velocity a inverted siphon requires? - 3ft/sec Two most common pipe materials used in the collection system? - Clay & PVC OSHA minimum standards for shoring, sloping, or trench boxes are? - 5ft or deeper If the trench is _____ or deeper, use a portable ladder or other means of exit. - 4ft or deeper The ladder most extend ____ feet above the trench and be secured. - 3ft Ladders must be within ____ feet of trench workers and not more than ____ feet apart. - 25ft, 50ft The excavation spoil must be at least? - 2ft from the edge of the trench Which type of pump is most often used in a lift station? - Centrifugal Pump What is CMOM? - Capacity, management, operations, and maintenance Install water lines no closer to a water line than ____ feet - 9ft Chlorine helps ______ grease, making it easy to skim - Congeal The magnetic meter works by the law of ________ - Induction How often do you calibrate flow measuring devices? - Annually Primary clarifiers should remove _____ percent of the incoming BOD - 35% Primary sludge is about ________% water and _______% solids - 94-96% water, and 4-6% solids Primary clarifiers should remove ____ % of the BOD and _____% of the settleable solids - 35%, 90-95% Usual blanket depth in a secondary clarifier is no more than ____ of the sidewall depth - 1/4 When sludge is within _____ inches of the slot, withdraw sludge - 18 inches Microorganisms including bacteria, protozoa, fungi, and microscopic animals, feed on the organic waste and can remove_________% of the BOD from wastewater - 92-99% A return sludge pumping system must be capable of pumping at least ______ gpd/sf but not more than______ gpd/sf - 200gpd/sf, 400gpd/sf What are the two ways to maintain the microorganism balance? - Food to Microorganism ratio (F/M) & Mean Cell Residence Time (MCRT)