Water Treatment Operator Test Questions Answered Correctly Latest Update 2024

Water Treatment Operator Test Questions Answered Correctly Latest Update 2024 Contamination - Answers Itroduction into water of micro organisms, chemicals, waste or wastwater which makes the water unfit for its intended use Disifection - Answers Process designed to kill or inactive most microorganisms in water Sterilization - Answers removal or destruction of all micro organisms in water, spores, vegitate What are the four categories of contaminants? - Answers Phsyical Chemical Biological Radiological What are the three types of microbrial contaminants? - Answers Bacteria Viruses Protozoans Of those three, which is the smallest of all contaminants? - Answers Viruses List five properties of chlorine gas - Answers Greenish yellow liquid 2 and half times heavier than air expands at rate of 450 to one non flammable supports combustion List types of chemical disefectants - Answers chlorine -chloramines, chlorine dioxide iodine (high cost, pregnant woman) bromine (handling difficulties) bases (bitter taste, sterlize) ozone (high cost, no residual, hard to store) Four factors that influence disinfection - Answers ph of water (lower is better) temperature (high is better) contact time concetration of disefectant What are the physical means of disenfection - Answers UV rays Heat Free avaliable chlorine vs combined chlorine - Answers Free chlorine is the portion of total avaliable residual chlorine, chlorine in normal state not combined, combined chlorine is the portion of total avaliable residual chlorine that is combined with nitrogen or other compounds but still able to disenfect What happens when you add chlorine to water - Answers two acids are formed, HOCL and HCL . HOCL forms two types depending on PH, stay in HOCL or broken up in H and OCL. HOCL has much greater disenfection ability. Higher the PH the more OCL you will get. Hypochlorinator - Answers Piece of equipment used to feed liquid chlorine solutions, positive diplacement pump and solution tank Aberometirc titration - Answers Most convient and repeatable chlorine residual results, expensive. DPD - Answers used to test for chlorine residual Sodium thiosulfate - Answers Reagent added to a microbial sample bottle to remove any Chlorine residual. Chlorine Leak Kits.... A, B, C - Answers A cylidner B one ton container C clean up a box car Chlorine leaks can be detected around a cylinder by using - Answers Ammonia, produce white smoke Addit - Answers Intake structure Treatment steps - Answers Raw water goes through screens to remove debri pre chlorination (optional) add chemicals (clump particles) 30 seconds coagulation floculation (fine particles gather into larger ones) sedimentation basin (particles settle out) filtration post chlorination (kills organisms and adds chlorine to water) water into clearwell (chlorine contact time) Conventional water treatment - Answers coagulation floculation sedimintation filtration conductivity - Answers A measure of the ability of a substance to conduct electricity. streaming current meter - Answers device used to optimize coaqulation doses (zero charge is optimized) What is the best ph for coaqulation - Answers 5-7 Sweep coagulation - Answers Achieving the desired pH range by overdosing the coagulant Jar Test - Answers A laboratory procedure that simulates coagulation/flocculation sedimintation. Used to figure out optimum coagulant dose. Floculation - Answers gathering of fine particles to gather together larger particles by gentle mixing, mechanical process Sedimentation - Answers water being treated flows slowly through a large tank or basin, heavy floc particles settle out of water, removrs 90% of bacteria and turbidity four zones of sedmitation basin - Answers inlet outlet settiling zone sludge zone in the filter bed, what kinds of filter media can you use - Answers mono media 1 (sand) dual media 2 (crushed coal, sand) mixed media 3 (crushed coal, sand, garnet) all over gravel (protects under train) What are some causes of shorter filter runs - Answers Filter overdosing excessive filtration rates excessive mudball formation clogging of underdrain system List three things that affect the need to backwash the filter - Answers turbidity headloss time breakthrough - Answers crack or break in a filter bed, allowing the passing of floc or particle matter three reasons filter first in service excess headloss valve open suddenly mudballs - Answers Material, approximately round in shape, that forms in filters and gradually increases in size when not removed by the backwashing process. Mudballs vary from pea-sized up to golf ball sized or larger. Greensand - Answers A mineral that looks like green filter sand and works as a natural ion exchange resin, and is capable of softening water. Also called glauconite Unit Filter Run Volume - Answers Best ways to compare filter runs to calculate filter effeciency volume of water produced in a run/square surface area of the fitler. gallons per square foot air binding - Answers dissolved air is realeased from the water passing through the filter bed, trapped in filter bed, prevents water from passing through the filters, damages media four types of filters allowed without special study - Answers gravity filtration pressure filatration diethemacisu earth filtation slow sand filtration short cirtuiting - Answers condition in tanks or basins when some of the water travels faster than the other, causes slower than presumed seddiling to contact times