Texas Wastewater B Exam 2024/2025, Exams of Water and Wastewater Engineering

Download Texas Wastewater B Exam 2024/2025 and more Exams Water and Wastewater Engineering in PDF only on Docsity!

TEXAS WASTEWATER B EXAM

2024/2025 WITH THE LATEST

AND UPDATED SCORE(100%

PASS).

Primary Clarifiers -- Answer ✔✔ In an activated sludge treatment system, primary treatment processes include the: Removal of Inorganic material from grit -- Answer ✔✔ In a washing grit remover, the grit is moved slowly by screw conveyors up an inclined channel in order to? 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:, True -- Answer ✔✔ The amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio Bulking -- Answer ✔✔ In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate Reseed The AB, Remove sludge from FC -- Answer ✔✔ 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 -- Answer ✔✔ 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 -- Answer ✔✔ When nitrification takes place in the activated sludge process, facultative bacteria use Primary clarifiers -- Answer ✔✔ 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 -- Answer ✔✔ One indication that an anaerobic digestion facility is improving would be? 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? Control odor, Reduce BOD ,Control foaming, Aid in sludge -- Answer ✔✔ Besides disinfection, chlorination can be used in wastewater treatment processes to? 450ml -- Answer ✔✔ If released to atmospheric pressure, one part liquid chlorine will expand to about? 8-12" -- Answer ✔✔ 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 -- Answer ✔✔ 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 -- Answer ✔✔ Direct aquifer recharge of treated effluent can be used to?

under new construction, new plant, not running yet -- Answer ✔✔ An exemption from filing monthly effluent reports with the TCEQ may be obtained if? Screens -- Answer ✔✔ A wastewater treatment plant would make use of? to remove small concentrations of dissolved organics from wastewater effluent 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? 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? 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: 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%

866 gpd -- Answer ✔✔ At a flow of 1.7 MGD, a 50-foot diameter circular clarifier has an overflow rate of about? BOD and COD -- Answer ✔✔ In the F/M Ratio Formula, the "food" is represented by the Mixed Liquor -- Answer ✔✔ In the extended aeration activated sludge process, the biological mass is kept Biological treatment for the removal of biodegradable organic wastes under aerobic conditions. -- Answer ✔✔ The extended air activated sludge treatment process:? 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 Points of change in alignment, grade, or size of sewer, at the intersection of all sewers and the end of all sewer lines -- Answer ✔✔ In a wastewater collection system, manholes should be placed To be less, or same. -- Answer ✔✔ In the contact stabilization system of activated sludge treatment, the detention time in the contact zone is designed to? other types of activated sludge treatment. 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 Methane and hydrogen sulfide -- Answer ✔✔ A combustible atmosphere, Methane & Hydrogen Sulfide To frost over -- Answer ✔✔ A leaking gas chlorine container? 19.5% -- Answer ✔✔ The definition of an oxygen-deficient atmosphere is one that contains less than ______ percent oxygen?

Precision and Accuracy -- Answer ✔✔ Reliable laboratory results are obtained primarily through None in 24 hr -- Answer ✔✔ A 24-hour composite sample was tested for chlorine residual and found to contain none. These results indicate that? Health of floc return sludge flow rate, bulking -- Answer ✔✔ In an activated sludge treatment plant, the 30-minute settleability test indicates? Toxicity of water by exposing living organisms to plant effluent -- Answer ✔✔ Biomonitoring Planning, PM, records, analysis -- Answer ✔✔ Achieving work goals for an individual works best when they are? Listen, trust, respect, understanding, empathy, and resolution -- Answer ✔✔ One element of being an effective communicator is to? 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? Remove harmful pollutants before the wastewater is discharged -- Answer ✔✔ The most important consideration when implementing a comprehensive pretreatment program within a municipal wastewater collection system is to,? Wastewater collection -- Answer ✔✔ In most pressure sewer systems, the pumping units or grinder pumps at each residence are considered to be? Turns Pump Off -- Answer ✔✔ What is the function of the bottom float in a lift station?