What is chlorine demand - Study guides, Class notes & Summaries

What is used as a chemical coagulant? - Answer Alum The correct order of treatment in a surface water plant is... - Answer Coagulation, Flocculation, Sedimentation and Filtration In determining the proper dosage of alum, the most useful test is the____________ test. - Answer Jar If sludge is not continually removed from the sedimentation basin, its accumulation results in? - Answer Turbidity The most widely used coagulant is.... - Answer Aluminum sulfate Optimum flocculation requires: - ...

Basic Wastewater Operator Practice Exam Questions And Answers What is the predominant organism in a healthy activated sludge treatment plant? A. Stalked ciliates B. rotifers C. nematodes D. amoebas - ANS A. Stalked Ciliates A composite sample must be? A. sporadically collected in the treatment plant B. taken at one time C. analyzed immediately D. representative and sub-samples time spaced over 15 minutes apart - ANS D. representative and sub-samples time spaced over 15...

Which device measures the hydrogen ion activity in a solution? - ANSWER PH Meter What is the purpose of a shaft sleeve in a centrifugal pump? - ANSWER Protects the sleeve from damage What is a nutating disc - ANSWER Type of water meter for small diameter domestic service what will happen to a steel pipe if the water has low PH? - ANSWER Corrode ___________________is a disinfection by product precursor - ANSWER Natural organic matter One of the requirements of the Lead and Copper R...

What is common practice in an activated sludge process? A) Waste all activated sludge B) Sludge age of 14 days for conventional system C) Recirculate activated sludge (RAS) D) Limiting DO to increase the mircoorganism population -----CORRECT ANSWER------ --C) Recirculate activated sludge (RAS) (v.2 pg 20,21) Prior to entering a permit required confined space, what should you verify? A) a standby person should be at the entrance to the confined space. An additional person is not required ...

The name of the State Agency responsible for enforcing pollution control laws in Texas is - a. Texas Water Development Board b. Texas Water Commission c. Texas Section of EPA d. Texas Commission on Environmental Quality e. Texas Water Resource and Conservation Commission - D The term pathogenic means - a. Aerobic Bacteria b. Anaerobic Bacteria c. Fecal Matter d. Coliform Bacteria e. Capable of Causing Disease - E The minimum separation between sewer lines and potable water...

What term is used when a water utility divides its total operating expenses into the total revenue? a.) Debt ratio b.) Operating ratio c.) Credit ratio d.) Coverage ratio b.) Operating ratio Under the requirements of the Safe Drinking Water Act, it is the duty of the water purveyor to deliver potable water of proper quality only as far as the: a.) Entry point of the distribution system b.) Customer's curb box and service connection c.) Consumer's tap inside the home d.) Furthest wate...

In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. (Ans- True Water covers approximately ________ of Earth's surface. (Ans- 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. (Ans- atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking (Ans- True Excluding outside water use, the average household uses about _______ gallons of wat...

TCEQ Class D Water Operator License Exam Questions and Answers Latest 2024/2025 | 100% Correct | Graded A+. In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. (Ans- True Water covers approximately ________ of Earth's surface. (Ans- 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. (Ans- atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking an...

What does a C value of 140 means for a pipe? - ANSWER The pipe interior is very smooth. Which primary contaminant causes Blue Baby Syndrome? - ANSWER Nitrate. What is a nutating disc? - ANSWER Type of a water meter for a small-diameter domestic service. What causes hardness in water? - ANSWER Magnesium and calcium. Which of the following is a confined aquifer with groundwater under positive pressure? - ANSWER Artesian. ____________ is an imaginary surface to which groundwater rise...

What's the methane content in a properly operating a anerboic digestor? - Answer 65-70% by volume What will the addition of chlorine gas do to the pH of wastewatee - Answer Decrease pH What's the purpose of a parshall flume? - Answer Measure flowrate What's the typical removal efficiency of set table solids in a primary clarifier ? - Answer 95-99% Which of the following is true about pumping scum from a primary clarifier ? - Answer Scum causes piping issues What cause...