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What is the general definition of an ion? An _________ with a positive or negative charge Atom A continuous positive pressure in a distribution system is essential for preventing what event? Backflow Event _____________ water pressure must be maintained to ensure adequate customer service during peak flow periods. However, minimum positive pressure must be maintained in mains to protect against backflow or backsiphonage from cross-connections. Minimum Name the most common...

A _____ flume is widely used for measuring wastewater flow. Parshall (Operation of Wastewater Treatment Plants, Volume 1 by Kenneth D. Kerri) Velocity of flow in a grit channel must be reduced to a range of ____ to _____ fps in order for grit to properly settle. .7 to 1.4 fps (Operation of Wastewater Treatment Plants, Volume 1, 3.33 by Kenneth D. Kerri) With respect to grit removal systems, grit is traditionally defined as particles larger than 0.21mm (0.008 in) (65 mes...

Contamination Itroduction into water of micro organisms, chemicals, waste or wastwater which makes the water unfit for its intended use Disifection Process designed to kill or inactive most microorganisms in water Sterilization removal or destruction of all micro organisms in water, spores, vegitate What are the four categories of contaminants? Phsyical Chemical Biological Radiological What are the three types of microbrial contaminants? Bacteria Viruses Pro...

WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? storm events WasteWater Sources & Characteristics: Combined wastewater is defined as sanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: In general, the solids content in wastewater is about 0.1% WasteWater Sources & Characteristics: In general, what is the % of suspended solids in th...

How many Training Hours and experience for a class D Water Operator 16 Hours Training and No Experience How many Training Hours and experience for a class C Water Operator 36 Hours Training and 1 year Experience How many Training Hours and experience for a class B Water Operator 100 Hours Training and 3 years Experience (must include 1 year of hands on experience) How many Training Hours and experience for a class A Water Operator 200 Hours Training and 5 years Experienc...

____ and/or _________ in a water supply can discolor laundry, cause a bad taste in the water, and cause taste problems in beverages such as coffee and tea. Iron and/or Manganese Water systems that collect less than _____ coliform samples each month can have 1 positive sample and remain in compliance. 40 The maximum contaminant level for bromate is _____ mg/L. 0.010 mg/L Water systems must provide at least _____ removal or inactivation of Giardia lamblia cysts between a ...

What is true about chlorine gas? It is 2.5 times heavier than air What is the typical BOD removal efficiency in a primary clarifier? 20 to 50% What does the "F" in F/M ratio represent? The food for the microorganisms flowing into the aeration tank, in lbs/day What describes the appearance of healthy activated sludge? Brown with a moderate amount of crisp, white foam What is used to control filamentous organisms? Chlorine What are commonly used to control...

The main objective of a safety program is to _ _. prevent accidents _, _ _ is the most appropriate person for evaluating a potential safety hazard. you the operator _, _ _ has the most to gain from an effective safety program. you the operator For a water system to have an effective safety program, the most important item that operators can do is _ _ _ _ (_). commit to the program (attitude) Excavated material, tools, and other equipment needs to be placed at le...

The first step in maintenance staff should take in properly locking and tagging out a piece of equipment is to alert the operator on duty When working in an area with two or more floor coverings, be sure that they are always Secured together When manually lifting any object be sure to keep it close to your body and use leg strength Oxygen deficiency becomes a concern when the oxygen level in a confined space is less than 19.5% What provides safety information for ...

b) Kilopascals What units are used to measure water pressure? a) Kilowatts b) Kilopascals c) Horsepower d) Head units a) Exhaust fan Which of the following is NOT an example of PPE (Personal Protective Equipment)? a) Exhaust fan b) SCBA c) Face shield d) Traffic vest d) Be the operator with overall operational responsibility of the system Which of the following are operators-in-training NOT allowed to do? a) There are no restrictions on the duties of an operator-i...

Presedimentation Reduce silt in water Settling zone Calm area in settling basin where suspended materials settle Coagulation Occurs in Seconds Flocculation Occurs in Minutes (optimum velocity 0.5 fps) Floc should be popcorn sized Sedimentation Occurs in Hours (4 hour detention time) Typical Coagulants Aluminum Sulfate Al2(SO4)3 Ferrix Fe2(SO4)3 pH Increasing Chemicals Lime (Ca(OH)2), Caustic soda, Soda ash, Bicarbonate pH Lowering Carbon...

Surface water runoff, storm water, sanitary and industrial. A collection system that is called "combined" may carry this kind of wastewater: 2 The flow in a collection system should be a minimum of ____ feet per second (FPS)? Solids will settle. What will happen if the flow is too slow in a collection system? Odors, Corrosion, Hydrogen Sulfide Gas (all of the above) A short detention time in the collection system will help prevent which of the following problems? ...

If a customer complains about the drinking water characteristics, the operator should record the complaint and... Investigate immediately What term is used when a water utility divides its total operating expenses into a total revenue? Operating ratio How often should data, such as flow rate, amount of water treated, dosage of chemical, and reservoir levels be recorded? Daily Under the requirements of the Safe Water Drinking Act, it is the duty of the water purveyor to de...

In the activated sludge process, some of the activated sludge must be wasted to... A. Prevent excessive solid buildup B. Prevent clogging of the sludge return line C. Prevent overloading of sludge return pumps D. Increase digester gas production A. Prevent excessive solid buildup The best operating strategy for feeding primary sludge to an anaerobic digester is to feed... A. Several time a day B. Large quantities once or twice a day C. Once a day D. When the volatile solids d...