Biology Questions and Answers
separated. The toxic waste includes
industrialharmful for life and the environment, chemical residuals that are (^)
like contaminated medical waste and
the domesticinsecticides and medicines; the toxic waste containing (^)
waste is one of the major environmental
problems since it phumans and other living buts the life ofeings in (^)
danger. The nuclear toxic waste is made
of materials that reldangerous radiation ease invisiblfor many years;e (^)
nuclear toxic waste is produced in the
extractionuranium), of nuclear by nuclear minerals (likereactors and
nuclear pNuclear Medicine lants, in hospitalsis performed and in where (^)
research centers; although the nuclear
waste is oreceptacles thften put into armore risk of accidents ised (^)
permanent. Space waste is the waste
produced by the activityspace from the second half of the 20th of humans in (^)
century; it consists of non operating
satellites,equipments that remain rocket piece and otherorbiting the (^)
earth or other celestial bodies or even
travelling across space.
Environmental Issues: organic waste
recyclable waste ntoxic waste nuclear toxicon recyclable waste waste
- What is selective waste
collection?
Recyclable waste is waste that can reprocessed and used again. Wastebe
recycling dethe recyclable residpends on the separatiouals from non n of
recyclable onof the recyclablees and on the classification into plastics, metals,
papers, etc. The function of the
selective waste collection isthat separation for the waste to to simplifybe
sorted at the point of origin. Selectivecollection also henvironmental conscience in elps the creation othe peoplef an (^)
that produce the waste.
- What is the cost-benefit
relationship regarding sewage
treatment as a strategy to
fight water pollution?
To treat sewasociety. The non treatege is much chd sewaeaper forge
pollutes riva cause of diseases traers, lakes and the sea, bnsmitted througheing (^)
water. For the society the costs of these
diseasesof the sewa are much hge treatment.igher than the cost
One of the most economical systemstreat sewage is the aerobic treatment to
system, reservoirs kept very
oxygenated for aerobic bacteria todecompose organic material.
- What is eutrophication?
Eutrophication is the process of
excessivephosphate a increasinnd nitrate, in g of nutrients, likewater due to (^)
direct deposit of non treated sewage.
The nutrients act as fertilizers leaabnormal proliferation of aquatic algae.ding to
With the exaggerated growth of the alga
population thbacteria that cause de number of aerobicecomposition (^) of
organic material also increases. The
proliferation othe dissolved oxygen killing ff these bacteria dishes aepletesnd
other animals.oxygen causes th Besides, the lack ofe decomposition to be (^)
assumed by anaerobic bacteria.
Anaerobes multiply and release
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