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REHS EXAM-SOLID WASTE
MANAGEMENT.
What does RCRA stand for? a. Recovery, Conservation, and Refuse Administration b. Radioactive Chemical Recovery Administration c. Radioactive Chemical Recovery Act d. Resource Conservation and Recovery Act - Answerd. Resource Conservation and Recovery Act Compression or shredding of bulky objects before landfilling them will a. improve compaction of the fill b. reduce land volume requirements c. allow for more uniform settlement d. all of the above - Answerd. all of the above To provide enough refuse for an incinerator to continuously operate, a refuse storage pit/bin must hold approximately a. 1 day of refuse b. 2-4 days of refuse c. 5-6 days of refuse d. at least 7 days of refuse - Answerb. 2-4 days of refuse
Volume reduction can be achieved by a. baling b. landfill equipment c. pulping d. all of the above - Answerd. all of the above ______ reduces the final volume of wastes. a. compaction b. maceration c. pneumatic transport d. a and b above - Answerd. a and b above Which of the following is not one of the four characteristics of hazardous wastes as defined by the Environmental Protection Agency? a. radioactivity b. toxicity c. explosive d. all of the above - Answera. radioactivity The best way to control deep fires in a sanitary landfill is to a. inject water under the cover material at strategic points throughout the landfill b. separate the burning refuse and dig a fire brake around the burning refuse c. smother the burning area with landfill liner made of polymeric or asphaltic materials
Incinerators are rated in terms of a. percent fuel capacity per day b. BTUs per day c. tons of burnable waste per day d. cubic feet of solid waste per day - Answerc. tons of burnable waste per day Determining what a landfill can be used for when completed should be planned a. when the landfill is half full b. before you build the landfill c. when the landfill is full d. any time during the operation of the landfill - Answerb. before you build the landfill The size and type of machinery needed at the sanitary landfill is dependent on a. the amount of solid waste handled b. the availability of cover material c. the compaction to be achieved d. all of the above - Answerd. all of the above Collection cost is about ______ of the total cost of solid waste management. a. 10%-20% b. 20%-40% c. 50%-70%
d. 70%-90% - Answerc. 50%-70% The amount of residue left after incineration is approximately a. 10 to 15 percent of the original volume b. 25 to 50 percent of the original volume c. 55 to 65 percent of the original volume d. none of the above - Answera. 10 to 15 percent of the original volume The second step of the combustion process in an incinerator requires a high temperature of at least a. 1500 to 1600 degrees F b. 1500 to 1800 degrees F c. 1900 to 2000 degrees F d. 1800 to 1900 degrees F - Answerb. 1500 to 1800 degrees F The goal for management of hazardous waste should be a. safe disposal methods b. minimal impact on the environment c. zero discharge d. all of the above - Answerc. zero discharge The direction of operation of a sanitary landfill should be a. against the prevailing wind b. with the prevailing wind c. perpendicular to the prevailing wind
a. tile or have water walls b. plastic and molten slag c. brick with fire-rods d. steel - Answera. tile or have water walls The spread of ______ is (are) encouraged when uncooked garbage is fed to hogs a. trichinosis to humans b. hog cholera c. vesicular exanthema in swine d. all of the above - Answerd. all of the above Resource recovery and reduction of solid wastes should start a. at the point of generation b. at the sanitary landfill c. in the home d. at the transfer station - Answera. at the point of generation The best sanitary landfill method for an area with rolling terrain is the a. low-area method b. valley or ravine area method c. trench method d. area or ramp method - Answerd. area or ramp method
Which of the following is a disadvantage to using shredded solid waste in a landfill? a. it does not cause odors b. it may not require daily earth cover c. it will readily absorb precipitation d. it reduces insect breeding - Answerc. it will readily absorb precipitation High-density compaction of solid wastes is accomplished by compression to a density of more than ______. a. 75.5/lb ft b. 60.5/lb ft c. 66.5/lb ft d. none of the above - Answerc. 66.5/lb ft Various garbage reduction processes extract biological fats that are then used in the manufacturing of a. soaps and glycerines b. glue and cement c. grouting and calk d. fertilizer and cattle feed - Answera. soaps and glycerines The temperature of the gases leaving the furnace is reduced by a. spraying with water b. dilution with cool air c. passing through heat exchanges
b. must pass through a grease trap before entering a sewerage system c. should not be allowed to run onto the surface of the ground d. all of the above - Answerd. all of the above The transfer station should be located ______ of the collection service area. a. on the perimeter b. at the busiest location c. in the center d. none of the above - Answerc. in the center The normal economical hauling distance to a refuse disposal site is usually between a. 5 to 10 miles b. 10 to 15 miles c. 15 to 20 miles d. 20 to 25 miles - Answerb. 10 to 15 miles Which of the following is not recommended for a refuse storage area? a. a drained concrete floor b. ample natural or artificial light and ventilation c. temperature kept below 50 degrees F d. uncovered base - Answerd. uncovered base In the rectangular furnace, the grates are arranged in
a. arches b. rectangles c. tiers d. circles - Answerc. tiers Oil that has had a physical and chemical impurities removed and that by itself or when blended with new oil or additives, is substantially equivalent or superior to new oil intended for the same purposes, is called a. re-refined oil b. substandard oil c. terrestrial oil d. subsurface oil - Answera. re-refined oil In good soil and with appropriate geology, landfill sites should be at least ______ from streams, lakes, or other surface bodies of water. a. 100 feet b. 200 feet c. 500 feet d. 700 feet - Answera. 100 feet A dragline may be used at a landfill site for a. digging trenches b. stockpiling cover material c. placing cover material over refuse d. all of the above - Answerd. all of the above
pounds and a horizontal force of ______ pounds without overturning, with the force applied where tipping of the bin is not likely. a. 191; 70 b. 223; 97 c. 200; 100 d. 50; 100 - Answera. 191; 70 Shredding reduces the volume of wastes to about ______ or less of the original bulk. a. 60 percent b. 50 percent c. 40 percent d. 30 percent - Answerc. 40 percent When considering a site for a sanitary landfill, both county and regional-wide planning and administration of the site should be considered because a. it could result in shorter travel distances and a lower unit of cost for operation b. the results could be more efficient and a lower unit cost for operation c. there will be less citizen opposition and shorter travel distances d. all of the above - Answerd. all of the above The Toxic Substances Control Act (TSCA) of 1976 a. mandates government (Federal and State) control of hazardous wastes from their point of generation to their point of ultimate disposal
b. regulates the production and use of chemical substances that may present an unreasonable risk of injury to health or environment c. requires that all toxic substances transported from one point to another by air, land, or sea be properly documented through an approved manifest system d. regulates all hazardous wastes generated at health care facilities through Federal and State governments - Answerb. regulates the production and use of chemical substances that may present an unreasonable risk of injury to health or environment A landfill site should not a. be located near a major highway b. be given an attractive entrance and approach road c. house equipment on site d. be inaccessible during bad weather conditions - Answerd. be inaccessible during bad weather conditions ______ can be recovered from refuse by burning it in a refractory lined incinerator or water-wall incinerator. a. glass b. aluminum c. ferrous metal d. energy - Answerd. energy Acidic conditions ______ the growth of methane-producing bacteria. a. increase b. inhibit
Composting is the controlled decay of organic matter that may come from a. sewage sludge b. agricultural waste c. organic industrial waste d. all of the above - Answerd. all of the above When trying to establish economical hauling, what is most important? a. hauling time b. hauling distance c. means of hauling d. what is being hauled - Answera. hauling time Dead animals are best disposed in a. an incinerator or rendering plant b. a separate area of sanitary landfill c. a composting bed d. either a or b above - Answerd. either a or b above The National Safety council reported that solid waste collection workers have an injury frequency approximately ______ times the national average for all industry. a. ten b. two c. three d. five - Answera. ten
The most suitable soil for cover material at a landfill site is one that is a. easily worked and minimizes infiltration b. relatively porous and rich in nitrogen c. most convenient to the site and always available d. dug from the trenches where the waste will be deposited - Answera. easily worked and minimizes infiltration The life of a tractor at a landfill is figured to be about a. 6,000 hours b. 8,500 hours c. 10,000 hours d. 12,500 hours - Answerc. 10,000 hours Depending on the size of the community, there should be a minimum of one man at a landfill site and ______ men per 1000 yd3 of waste dumped per day that the site is open. a. six b. four c. three d. two - Answera. six
