TEXAS WASTEWATER B EXAM WITH COMPLETE SOLUTIONS GUARANTEED PASS, Exams of Nursing

Download TEXAS WASTEWATER B EXAM WITH COMPLETE SOLUTIONS GUARANTEED PASS and more Exams Nursing in PDF only on Docsity!

TEXAS WASTEWATER B EXAM WITH COMPLETE

SOLUTIONS GUARANTEED PASS

In an activated sludge treatment system, primary treatment processes include the: - ANSWER - >Primary Clarifiers In a washing grit remover, the grit is moved slowly by screw conveyors up an inclined channel in order to? - ANSWER - >Removal of Inorganic material from grit An efficient primary clarifier is expected to remove? of the influent settleable solids. - ANSWER - >90% or above Proper operation of a facultative pond system requires that:, - ANSWER - >Adequate DO at surface at all times The amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio - ANSWER - >True In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate - ANSWER - >Bulking The purpose of returning the solids from the bottom of the clarifier to the aeration tank in the activated sludge

process is to - ANSWER - >Reseed The AB, Remove sludge from FC Microscopic examination of a good-settling sludge should show a predominance of: - ANSWER - >Free swimmer rotifers stalked ciliates When nitrification takes place in the activated sludge process, facultative bacteria use - ANSWER - >Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate 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? - ANSWER -

Primary clarifiers One indication that an anaerobic digestion facility is improving would be? - ANSWER - >Low C02 high Methane 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? - ANSWER - >False

Besides disinfection, chlorination can be used in wastewater treatment processes to? - ANSWER - >Control odor, Reduce BOD ,Control foaming, Aid in sludge If released to atmospheric pressure, one part liquid chlorine will expand to about? - ANSWER - >450ml Anaerobically digested sludge should be applied to a drying bed to a depth of about? - ANSWER - > 8 - 12" Sludge from a digester should be slowly drawn to a drying bed in order to? - ANSWER - >Not to create a negative pressure in the anaerobic digester and to prevent coning of sludge Direct aquifer recharge of treated effluent can be used to? - ANSWER - >Recharge Water supply, keep saline out of groundwater stop ground Substance An exemption from filing monthly effluent reports with the TCEQ may be obtained if? - ANSWER - >under new construction, new plant, not running yet A wastewater treatment plant would make use of? to remove small concentrations of dissolved organics from wastewater effluent - ANSWER - >Screens

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? - ANSWER - >5.4 acres 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? - 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:

• ANSWER - >430G

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% - ANSWER -

80% At a flow of 1.7 MGD, a 50-foot diameter circular clarifier has an overflow rate of about? - ANSWER - >866 gpd In the F/M Ratio Formula, the "food" is represented by the - ANSWER - >BOD and COD In the extended aeration activated sludge process, the biological mass is kept - ANSWER - >Mixed Liquor The extended air activated sludge treatment process:? - ANSWER - >Biological treatment for the removal of biodegradable organic wastes under aerobic conditions. When a potable water supply is used to provide clean water to water seals on a wastewater pump, the installation should be made - ANSWER - >Next to Air Gap

In a wastewater collection system, manholes should be placed - ANSWER - >Points of change in alignment, grade, or size of sewer, at the intersection of all sewers and the end of all sewer lines 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. - ANSWER - >To be less, or same. Under the OSHA Hazard Communication Standard, an annual meeting to explain the Law and the company's written policy must be held for - ANSWER - >Employers that have hazardous chemicals in their workplaces are required A combustible atmosphere,Methane & Hydrogen Sulfide

• ANSWER - >Methane and hydrogen sulfide A leaking gas chlorine container? - ANSWER - >To frost over The definition of an oxygen-deficient atmosphere is one that contains less than ______ percent oxygen? - ANSWER - >19.5%

Reliable laboratory results are obtained primarily through - ANSWER - >Precision and Accuracy A 24-hour composite sample was tested for chlorine residual and found to contain none. These results indicate that? - ANSWER - >None in 24 hr In an activated sludge treatment plant, the 30-minute settleability test indicates? - ANSWER - >Health of floc return sludge flow rate, bulking Biomonitoring - ANSWER - >Toxicity of water by exposing living organisms to plant effluent Achieving work goals for an individual works best when they are? - ANSWER - >Planning, PM, records, analysis One element of being an effective communicator is to? - ANSWER - >Listen, trust, respect, understanding, empathy, and resolution The permit requirements for a particular wastewater treatment plant are based on? - ANSWER - >Facility operations, type and amount of discharge, and the condition of the receiving waters.

The most important consideration when implementing a comprehensive pretreatment program within a municipal wastewater collection system is to,? - ANSWER -

Remove harmful pollutants before the wastewater is discharged In most pressure sewer systems, the pumping units or grinder pumps at each residence are considered to be? - ANSWER - >Wastewater collection What is the function of the bottom float in a lift station? - ANSWER - >Turns Pump Off