Download Texas Wastewater B Exam Verified 2024 and more Exams Water and Wastewater Engineering in PDF only on Docsity! Texas Wastewater B Exam Verified 2024 19.5% - ANSWER-The definition of an oxygen-deficient atmosphere is one that contains less than ______ percent oxygen? 430G - ANSWER-Under average flow conditions, it takes 18 minutes for a 10-foot diameter lift station wet well to fill the 5 feet between the low water line and the level where the lead pump comes on. After the pump comes on, it runs for 11 minutes before turning off. These measurements indicate the average discharge rate of the pump is about: 450ml - ANSWER-If released to atmospheric pressure, one part liquid chlorine will expand to about? 5.4 acres - ANSWER-The maximum design organic loading for stabilization ponds is 35 pounds of BOD per acre per day. An industry wants to construct a facility with projected flow of 50,000 gpd and an average BOD of 450 mg/l. A stabilization pond to serve this projected loading would need to be a minimum size of? 8-12" - ANSWER-Anaerobically digested sludge should be applied to a drying bed to a depth of about? 80% - ANSWER-Samples of water are taken from both the inlet and outlet ends of a clarifier and poured into separate one-liter Imhoff cones. After settling for two hours, the sample of inlet water shows a settleable solids concentration of 10 mg/l while the sample of outlet water shows a settleable solids concentration of 2 mg/l. These measurements indicate the efficiency of the clarifier for settleable solids removal is, 80% 86.41 - ANSWER-A sewer construction project in rocky ground will require a 2 foot wide by 350 foot long trench with an average depth of 10 feet. The new pipe and select bedding material (hauled in) will occupy the bottom third of the trench. Assuming that the rest of the soil from the trench can be used for backfill, the cubic yards of spoil dirt which must be hauled away will be about? 866 gpd - ANSWER-At a flow of 1.7 MGD, a 50-foot diameter circular clarifier has an overflow rate of about? 90% or above - ANSWER-An efficient primary clarifier is expected to remove ? of the influent settleable solids. Adequate DO at surface at all times - ANSWER-Proper operation of a facultative pond system requires that:, Biological treatment for the removal of biodegradable organic wastes under aerobic conditions. - ANSWER-The extended air activated sludge treatment process:? BOD and COD - ANSWER-In the F/M Ratio Formula, the "food" is represented by the Bulking - ANSWER-In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate Control odor, Reduce BOD ,Control foaming, Aid in sludge - ANSWER-Besides disinfection, chlorination can be used in wastewater treatment processes to? Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate - ANSWER-When nitrification takes place in the activated sludge process, facultative bacteria use Employers that have hazardous chemicals in their workplaces are required - ANSWER- Under the OSHA Hazard Communication Standard, an annual meeting to explain the Law and the company's written policy must be held for Facility operations, type and amount of discharge, and the condition of the receiving waters. - ANSWER-The permit requirements for a particular wastewater treatment plant are based on? False - ANSWER-The terms "low rate" and "high rate" when used in reference to the anaerobic digester refer to the rate of stabilization of the raw sludge? Free swimmer rotifers stalked ciliates - ANSWER-Microscopic examination of a good- settling sludge should show a predominance of: Health of floc return sludge flow rate, bulking - ANSWER-In an activated sludge treatment plant, the 30-minute settleability test indicates? Listen, trust, respect, understanding, empathy, and resolution - ANSWER-One element of being an effective communicator is to? Low C02 high Methane - ANSWER-One indication that an anaerobic digestion facility is improving would be? Methane and hydrogen sulfide - ANSWER-A combustible atmosphere,Methane & Hydrogen Sulfide Mixed Liquor - ANSWER-In the extended aeration activated sludge process, the biological mass is kept Next to Air Gap - ANSWER-When a potable water supply is used to provide clean water to water seals on a wastewater pump, the installation should be made
