Texas Wastewater B Exam: Questions and Answers, Exams of Water Resources Planning and Management

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2024-2025 Texas Wastewater B Exam.

Questions and Correct Verified Answers.

Graded A

19.5% - ANSThe definition of an oxygen-deficient atmosphere is one that contains less than ______ percent oxygen? 430G - ANSUnder 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 - ANSIf released to atmospheric pressure, one part liquid chlorine will expand to about? 5.4 acres - ANSThe 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" - ANSAnaerobically digested sludge should be applied to a drying bed to a depth of about? 80% - ANSSamples 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 - ANSA 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 - ANSAt a flow of 1.7 MGD, a 50-foot diameter circular clarifier has an overflow rate of about? 90% or above - ANSAn efficient primary clarifier is expected to remove? of the influent settleable solids.

Facility operations, type and amount of discharge, and the condition of the receiving waters. - ANSThe permit requirements for a particular wastewater treatment plant are based on? False - ANSThe 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 - ANSMicroscopic examination of a good- settling sludge should show a predominance of: Health of floc return sludge flow rate, bulking - ANSIn an activated sludge treatment plant, the 30-minute settleability test indicates? Listen, trust, respect, understanding, empathy, and resolution - ANSOne element of being an effective communicator is to? Low C02 high Methane - ANSOne indication that an anaerobic digestion facility is improving would be?

Methane and hydrogen sulfide - ANSA combustible atmosphere,Methane & Hydrogen Sulfide Mixed Liquor - ANSIn the extended aeration activated sludge process, the biological mass is kept Next to Air Gap - ANSWhen a potable water supply is used to provide clean water to water seals on a wastewater pump, the installation should be made None in 24 hr - ANSA 24-hour composite sample was tested for chlorine residual and found to contain none. These results indicate that? Not to create a negative pressure in the anaerobic digester and to prevent coning of sludge - ANSSludge from a digester should be slowly drawn to a drying bed in order to? Planning, PM, records, analysis - ANSAchieving work goals for an individual works best when they are?

Remove harmful pollutants before the wastewater is discharged - ANSThe most important consideration when implementing a comprehensive pretreatment program within a municipal wastewater collection system is to,? Reseed The AB, Remove sludge from FC - ANSThe purpose of returning the solids from the bottom of the clarifier to the aeration tank in the activated sludge process is to Screens - ANSA wastewater treatment plant would make use of? to remove small concentrations of dissolved organics from wastewater effluent To be less, or same. - ANSIn the contact stabilization system of activated sludge treatment, the detention time in the contact zone is designed to? other types of activated sludge treatment. To frost over - ANSA leaking gas chlorine container? Toxicity of water by exposing living organisms to plant effluent - ANSBiomonitoring True - ANSThe amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio

Turns Pump Off - ANSWhat is the function of the bottom float in a lift station? under new construction, new plant, not running yet - ANSAn exemption from filing monthly effluent reports with the TCEQ may be obtained if? Wastewater collection - ANSIn most pressure sewer systems, the pumping units or grinder pumps at each residence are considered to be?