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Tabel 2

Huishoudelike herwinningsdata

Herwinbareafval Totale Hoeveelheid (kg) Prys per KG Totaal
Metaal (aluminium) R8,20
Papier 55c
Plastiek 85c

2.1 Bereken hoeveel geld iemand sal verdien wat 750 kg metaal per week versamel.

2.2 Ontwerp ‘n grafiek om die data van tabel 2 te illustreer.

2.3 Watter materiaal skep die meeste afval?

2.4 Watter materiaal is die winsgewendste om te versamel en aan herverkopers te verkoop?

Aktiwiteit 3:

Om te demonstreer dat jy begryp hoe materiale (plastiek) herwin kan word.

[lu 2.2]

Plastiek is die moeilikste van alle materiale om te herwin. Die rede hiervoor is dat daar baie verskillende soorte plastiek is. Plastiek is ook nie ‘n natuurlike stof nie. Plastiek is nie bio-afbreekbaar nie, dus sal dit nie mettertyd in die opvulterrein roes of vergaan nie.

  • Daar is tog baie plastiekprodukte wat gemerk is sodat verbruikers kan weet watter plastiek herwin kan word. Die herwinningsproses vir plastiek verloop gewoonlik so: Dit word skoongemaak, in vlokkies opgesnipper en gesmelt om korrels te maak wat dan in die finale vorm gegiet kan word. So word plastiese melkkratte, motormatjies en so meer gemaak. Brandende plastiek gee giftige of irriterende dampe af wat lugbesoedeling vererger. Omdat die herwinning van plastiek soveel probleme skep, word slegs 5% - 10% van alle plastiek herwin. Navorsers is hard besig om bio-afbreekbare plastiek te ontwikkel wat weens bakteriese werking of blootstelling aan die sonlIg sal disintegreer.

3.1 Verduidelik die term “nie-bio-afbreekbaar”.

3.2 Maak ‘n lys van produkte wat in plastiekhouers verpak word.

3.3 Waarom is plastiek so ‘n gewilde verpakkingsmateriaal?

3.4 Skryf ‘n paragraaf oor waarom plastiekafval so ‘n groot probleem is.

  • Glas is ‘n sterk, deursigtige materiaal wat gebruik word vir vensterruite, bottels, glase, en so meer. Dit het ‘n paar ongewone eienskappe – dit smelt maklik, is chemies onaktief en daarby is dit goedkoop, want die hoofbestanddeel van glas is sand.
  • Daar is in baie dorpe en stede bottelbanke waar ‘n mens jou glasafval kan weggooi. Party plekke het selfs twee verskillende houers: een vir gekleurde glas en een vir wit glas. Die glas word dan daarvandaan na ‘n herwinningsaanleg geneem waar dit skoongemaak en fyngebreek word. Die afvalglas word “breekglas” genoem. Dit smelt teen ‘n laer temperatuur as die grondstof waarvan glas gemaak word. So word op beide energie en grondstof bespaar. Baie firmas gee selfs ‘n groter deposito op hul leë bottels as wat deur ‘n herwinningsaanleg betaal word.

4.1 Noem twee voordele van glas.

4.2 Noem die nadele van glas waaraan jy kan dink.

4.3 Wat maak die glas wat in ‘n motor gebruik word anders as gewone glas?

4.4 Wat is glasvesel?

Aktiwiteit 5:

Om te demonstreer dat jy begryp hoe materiale (papier) herwin kan word.

[lu 2.2]

  • Mense gooi elke dag tonne papier weg. Daar is maniere waarop papier bymekaargemaak kan word sodat dit gebruik kan word om nuwe papier te maak. Wanneer papier herwin word om so wit te wees as skryfpapier, moet alle drukkersink van die afvalpapier verwyder word. Die afvalpapier word in bale geplaas en later in fyn stukkies opgesnipper. Daarna word dit in ‘n pulpmasjien ingevoer wat dit verpulp. Warm water en chemikalieë wat bygevoeg word, help om die papiervesels te skei en die ink te verwyder. Bytsoda word gewoonlik hiervoor gebruik. Papier van ‘n swakker gehalte, soos koerantpapier, word net met water gemeng om pulp te vorm wat dan in die papiervervaardigingsmasjien ingevoer word.
  • Papier word van hout gemaak. Omtrent 35 miljoen bome sou elke jaar gered kon word as afvalpapier en -karton herwin en verpulp kon word om nuwe papier te maak. In sommige tropiese lande is groot hardehoutwoude vernietig deurdat die volwasse bome afgekap is. Dit word “ontbossing” of “bosvernietiging” genoem. Dit kan baie skadelik wees vir die omgewing, want dit laat die grond kaal wat veroorsaak dat die grond maklik deur die tropiese reënbuie weggespoel word.
  • Bome verskaf ook suurstof wat ons almal nodig het om te kan lewe. Bome bied ook skuiling en woonplek vir baie diere. Gelukkig vind herbossing nou in baie dele van die wêreld plaas. Bome is een van die natuurlike hulpbronne wat vervang kan word deur nuwe aanplantings.

Questions & Answers

How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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Source:  OpenStax, Tegnologie graad 8. OpenStax CNX. Sep 13, 2009 Download for free at http://cnx.org/content/col11051/1.1
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