Chapter 1 Flashcards
Intrusion of seawater into groundwater basins results from _
Over-pumping from coastal groundwater basins
What is the basic objective of the operation of water treatment plants?
Provide safe, aesthetically pleasing water at a reasonable price
What is one characteristic of a community water system?
Has at least 15 service connections used by all-year residents or regularly serves at least 25 all-year residents
What influences the size of a water treatment plant as well as the number and types of processes it uses?
The impurities in the raw water
Water quality standards
Demand for water by the population being served
Fire protection
Cost considerations
Which Plant operating guidelines are routinely monitored by water treatment plant operators?
Flows and water quality indicators
What is one purpose of clear wells or plant storage reservoirs?
Provide the necessary operational storage to average out high and low flow demands. Acts as a buffer that prevents frequent ON/OFF cycling of finished water pumps and permits planned changed in treatment plant operation.
How would you verify the actual raw water flow rate after adjusting the pumping rate to a water treatment plant?
Reading the raw water flow measuring device and periodically check the storage levels in the clear well and service storage reservoirs to determine if they are meeting volume.
How are the initial selection of chemical types and anticipated feed rates for a given application in a water treatment plant usually determined?
Pilot-plant testing of the specific source water.
What is the best source of information about dangerous chemicals?
Safety data sheet
The chlorine cylinder in service has less than 1 day’s chlorine supply remaining. Three 150lb chlorine cylinders are in storage. The plant uses an average of 28lbs of chlorine per day. How many days of chlorine is available?
3*150 = 450
450/28 = ~16
Which of these chemicals is one of the most dangerous common alkalies?
Caustic soda
What should you do if an operator is not breathing due to chlorine gas exposure?
Perform hands-only cardio-pulmonary resuscitation (CPR). Push hard and fast in the center of the chest. Continue until breathing or help arrives.
Water samples taken to measure compliance with water quality standards are usually collected at _
Where water enters the distribution system.
In a water treatment plant, turbidity is commonly monitored at _
Source water, flocculation effluent, sedimentation effluent, and filter effluent
The range of turbidity removal effectiveness is important because of the relationship between turbidity and _
Bacteria and other pathogenic organisms
Federal laws include sludge from a water treatment plant as a _
Industrial waste
What should an operator promptly do when a treatment process upset results in the failure to meet a specific drinking water quality standard?
Notify supervisory personnel and the appropriate health authorities. In extreme cases, process shutdown and public notification may be required.
If a water treatment plant must be dewatered for emergency repairs, how would you prepare for this event?
Empty all storage reservoirs before repairs
What kinds of records are operators required to keep on file for specified time periods for regulatory compliance?
Water quality analyses and customer complaint records
What is one way of keeping track of how much time and money is spent doing various types of work?
The work order system
How can energy requirements for lighting be reduced in a water treatment plant?
Turn off lamps in unoccupied areas
What regulations require that accurate records of water treatment plant operations be maintained?
The National Primary Drinking Water Regulations of the Safe Drinking Water Act
What contributes to the most treatment plant accidents?
Carelessness and negligence
What is the responsibility of water treatment plant operators?
The production of safe and pleasant drinking water
