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59 Cards in this Set
- Front
- Back
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To measure the strength of wastewaters one would use
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Biochemical Oxygen Demand (BOD)
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DefineBiochemical Oxygen Demand (BOD)
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The BOD test is used to measure the strength of wastewater. The BOD of wastewater determines the milligrams per liter of oxygen required during stabilization of decomposable organic matter by aerobic bacteria action.
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Organism carried by the cockroach
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Salmonella
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Activated Sludge
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The term "activated sludge" refers to a brownish flocculent culture of organisms developed in aeration tanks under controlled conditions
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Chemical Oxygen Demand (COD)
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The milligrams of oxygen required to chemically oxidize the organic contaminants in one liter of wastewater
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Denitrification
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A biological process by which nitrate is converted to nitrogen gas.
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Dissolved Oxygen (DO)
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The oxygen dissolved in water, wastewater, or other liquid. DO is measured in milligrams per liter
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Floc
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Clumps of bacteria and particles that have come together to form clusters, or small gelatinous masses.
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Nitrogen
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Nitrogen is present in wastewater in many forms: total Kjeldahl nitrogen, ammonia nitrogen, organic nitrogen
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Nitrogen Cycle
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The cycle of life, death, and decay involving organic nitrogenous matter is known as the nitrogen cycle. In the nitrogen cycle ammonia is produced from proteins.
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Oxic
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A biological environment which is aerobic
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Raw Wastewater
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Wastewater before it receives any treatment.
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Wastewater
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Domestic wastewater is 99.9% water and 0.1% solids
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Which pesticide is ok for public use
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Sevin Dust
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Most likely cause of eye irritation in this scenario
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A) NTU 8
B) Chlorine residule of 4.5 C) Ph 7.5 |
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What agency regulates food additives?
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Food & Drug Administration
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Name the steps in order of water treatment
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Coagulation, Flocculation, Sedimentation, Filtration
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Coagulation
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Clumping of particles in wastewater to settle out impurities, often induced by chemicals such as lime, alum, and iron salts
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Flocculation
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Process by which clumps of solids in water or sewage aggregate through biological or chemical action so they can be separated from water or sewage
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Sedimentation
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Letting solids settle out of wastewater by gravity during treatment.
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Filtration
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A treatment process for removing solid (particulate) matter from water by passing the water through sand, activated carbon, or a man-made filter.
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A person become ill after only fours have passes the suspected meal was eaten their illness is likely to be
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Staph
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Patients in hospitals have increased susceptibility to nosocomial disease due to
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Close population subject to invasive procedures
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A process that utilizes heat to destroy microorganisms in food is called
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Pasteurization
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Disaster relief is predominantly dependent on
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Preplanning
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Before initiating pesticide use in a pest control program one should first consider
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Federal law governing pesticide use in that specific environment
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The purpose of the Hazard Communications act is too
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Inform & train employees
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Estimation of sewage water production is accomplished by
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Knowledge of wastewater contributing fixtures with in a dwelling
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How do you calibrate a thermometer
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In ice water
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when taking milk sample it is most important to
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Use sterile sampling containers
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The purpose of Blanching is to
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deactivate enzymes to retain color
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In plumbing structure, a "trap" is used to
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Prevent sewer gas from entering
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Gamma radiation is
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Dense & capable of penetrating deep flesh
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Fermentation in a coliform test would indicate
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Presence of fecal coliforms
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Someone who is still contagious or spreading a disease but no longer exhibits the symptoms associated is said to be
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Carrier
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While visiting a solid waste site you notice they are experiencing fly issues, you should
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Ask for pest control records
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A main component affecting bloom control of algae is
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Phosphorus
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Chlorine performance increased when PH
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Falls
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Best method for absorbing gases & aerosols?
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Activated Carbon
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The minimum dept for a septic tank is
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Six Feet
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The FDA considers with of the following to be an adulterated product
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A) Mold on blue cheese
B) milk with Listeria C) rice with weevils |
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What characteristic is used to determine the freshness of fish
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A) Sliminess
B) friable flesh C) Nice Red Gills |
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To measure of ionic radiation
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Electron volt
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Solution for ware washing should have chlorine content of
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50ppm
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At a disaster site the steps in order to be taken are
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Protect yourself, identify hazard etc
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Which of the following is Protozon
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Trichinosis
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Dried fruit are not PHF due to
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low water activity
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Presence of psychophilic bacteria in milk product would be evidence of
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improper pasteurization technique
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Plague is spread by
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Fleas
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A forklift driver has become light headed, pale, disoriented. The most likely causes is
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CO2 poisoning
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Sludge from water treatment facilities cannot be used in agriculture due to risk of
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Heavy metal build up
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Food is not to be in the danger zone longer than
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4hr
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Blue Baby syndrome is related toward
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Presence of nitrates in water supply
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Tags for shellfish must be kept for
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3months
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The Hantavirus is carried by
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house mouse
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Foods are called PHF's if they
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Support rapid multi action of pathogenic
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To prevent Trichinosis you should
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Cook pork thoroughly
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To raise the pH add
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Sodium Carbonate
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To remove chlorine use
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Sodium thiosulphate
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