Texas Wastewater B Exam 2024/2025 Questions with Complete Solutions Primary Clarifiers - Correct Answers In an activated sludge treatment system, primary treatment
processes include the:
Removal of Inorganic material from grit - Correct Answers In a washing grit remover, the grit is moved slowly by screw conveyors up an inclined channel in order to?90% or above - Correct Answers An efficient primary clarifier is expected to remove ? of the influent settleable solids.Adequate DO at surface at all times - Correct Answers Proper operation of a facultative pond system
requires that:,
True - Correct Answers The amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio Bulking - Correct Answers In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate Reseed The AB, Remove sludge from FC - Correct Answers The purpose of returning the solids from the bottom of the clarifier to the aeration tank in the activated sludge process is to Free swimmer rotifers stalked ciliates - Correct Answers Microscopic examination of a good-settling
sludge should show a predominance of:
Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate - Correct Answers When nitrification takes place in the activated sludge process, facultative bacteria use Primary clarifiers - Correct Answers In an activated sludge process, the results of a mixed liquor settling test indicate that the supernatant of the mixed liquor sample is clear, but the supernatant of the plant effluent sample is turbid. These test results indicate that the problem is occurring in the?Low C02 high Methane - Correct Answers One indication that an anaerobic digestion facility is improving would be? 1 / 2
False - Correct Answers 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?Control odor, Reduce BOD ,Control foaming, Aid in sludge - Correct Answers Besides disinfection, chlorination can be used in wastewater treatment processes to?450ml - Correct Answers If released to atmospheric pressure, one part liquid chlorine will expand to about?8-12" - Correct Answers Anaerobically digested sludge should be applied to a drying bed to a depth of about?Not to create a negative pressure in the anaerobic digester and to prevent coning of sludge - Correct Answers Sludge from a digester should be slowly drawn to a drying bed in order to?Recharge Water supply, keep saline out of groundwater stop ground Substance - Correct Answers Direct aquifer recharge of treated effluent can be used to?under new construction, new plant, not running yet - Correct Answers An exemption from filing monthly effluent reports with the TCEQ may be obtained if?Screens - Correct Answers A wastewater treatment plant would make use of ? to remove small concentrations of dissolved organics from wastewater effluent 5.4 acres - Correct Answers 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?
86.41 - Correct Answers 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?
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