_____ is the process designed to kill or inactivate most microorganisms in water or wastewater, including essentially all pathogenic bacteria. ___ is the
... [Show More] complete destruction of all organisms. - correct answer Disinfection, sterilization
Organic matter in water can consume great amounts of ___ while forming unwanted ____. - correct answer Disinfection, compounds
What is not a type of physical disinfection? - correct answer Chlorine
What is not a chemical disinfectant? - correct answer Carmine
Chlorine dioxide is an effective disinfectant because it does not form ___ that may be formed by other chlorine compounds: it is not affected by___; it is effective at higher pH levels; it reacts with ___, helping to remove them and eliminate their characteristic odors: and it can control___. - correct answer Carcinogenic compounds, ammonia, sulfide compounds, phenolic tastes and odors.
What is a limitation of prechlorination? - correct answer May increase the formation of trihalomethanes in raw water.
Care should be taken to prevent sharp bends in copper tubing because this will___ and eventually the tubing will____ - correct answer Weaken it, start leaking
Why do you not use wrenches longer than 6 inches (15cm), pipe wrenches, or wrenches with an extension on to open chlorine container valves? - correct answer These wrenches are only available in metric sizes
What should be done to the water supply pump when the hypochlorinator is hut down? - correct answer Turn water supply pump on at full operation
Liquid chlorine piping systems must be ___ because if moisture enters the system, it readily mixes with chlorine and forms___, which will corrode the pipes, valves, joints, and fittings. Corrosion can cause leaks and require that the entire system be replaced. - correct answer Dry ,hydrochloric acid
If consumers complain about chlorine tastes in their drinking water, what is the most likely cause of this problem? - correct answer The chlorine does is inadequate
When a chlorine leak occurs, the ___ containing the ___ should be routed to a treatment system for processing - correct answer Ventilated air, chlorine
When chlorination is practiced for disinfection, it should be ___ to protect the ____. - correct answer Continuous, water consumers
What is a disadvantage of using chlorine dioxide for disinfection? - correct answer Chlorine dioxide costs are higher than other more commonly used disinfection methods
Which item is not included in a chlorine safety program? - correct answer Oral rules and safety procedures
____ and ___ previously prevented widespread use of UV systems for disinfection, but it is gaining in popularity - correct answer Technological difficulties, high energy costs
UV disinfection systems are gaining in popularity today because of growing concern about the ___ of handling chlorine and the possible ___ of chlorination byproducts. - correct answer Safety aspects, health effects
Which item is not a goal of regulating the UV channel water level control device? - correct answer Maximize variation of the channel's water level
_ for the UV transmission and ___ are routine operations tasks for a UV disinfection system. - correct answer Checking UV monitors, cleaning the UV lamps
What is a potential cause of poor UV disinfection system performance? - correct answer Short-circuiting
Why is ozone not used more extensively in the disinfection of water? - correct answer Ozonation is a more complex technology than is chlorination or UV disinfection, requiring complicated equipment and efficient contacting systems.
What are pathogenic organisms? - correct answer Bacteria, viruses, protozoa, or internal parasites, capable of causing disease in a host. [Show Less]