Zusammenfassung der Ressource
Biogas production
(biofuels)
- biogas generator underground---- waste materials like food,plants animal and human
waste can be put in to create slurry
- anaerobic conditions to produce certain bacteria (anaerobic fermentation)
- warmth (30 degrees) so its underground for insulation so bacteria can work at optimum condtitions
- can be used as fertiser
- biogas----methane,carbon dioxide and water vapour
- Food production
- animals and plants
- factory farming ----restrict
movement and heat the
environment so more growth
- pros include faster growth...cheaper...more food.....
cons include spread of disease and cruelty due to poor
conditions
- accomidation cheap and secure from predators....environmental conditions controlled eg light and temp....
- expensive antibiotics for diseases spread in crowded conditions...behaviour of animals can
result in dead or injured animals...burning fossil fuels for electricity for light and heaters
- organic/free range
means less crulety
and natural
condition sto grow
but more food more
expense and
longer to grow
- fish farming-----net size
(smaller)....quotas(certain number you
can catch......avoiding fishing during
mating season...avoiding breeding
grounds and mesh size
- mycoprotien (fungus) high in protien and low in fat (meat substitute)
- fusarium grown in aerobic conditions
- fungus grows in fermenter on glucose syrup in aerobic conditions
- the biomass is harvested and purified to produce mycoprotien
- more efficient to produce food from plants as plants are at beginning of food chain
- producing food more efficent by reducing number of stages in food chain and restricting energy lost by livestock
- consumers consious of ethical environmental and ecomic implications on producing food
- food miles
- distance that food travels from where itrs grown to
where its bought
- concenerning towards environment from burning fossil fuels
for transporting food and burning fuels increase amount of
co2 in atmosphere
- reduce by buying products britain and locally /farmers markets means less travel
and less affect on global warming
- cons mean weather makes less availability in winter and greenhouses mean light and heat produce co2
- microorganisms can be used to produce fuels (biofuels)
from natural products by a form of anaerobic respiration
known as fermentation (no oxygen for this to happen)
- large scale biogas
generators are often
located near sewage works
or sugar factories where
waste can be easily
transported .. cuts down on
costs
- smaller biogas generators can supply energy
needs of individual families or farms .. waste
usually collected from kitchens and livestock
and is then digested by bacteria to produce
biogas
- these generators usually make
enough gas for a small village or
family..gas used for cooking stoves
heating and lighting homes
- producing biogas depends on
- temp of generator
- rate of fermentation
- type of waste used
- several designs for generators but all
require
- way of putting in waste materials
- way of removing digested waste materials
- way of removing biogas and transporting it to where its needed
- bioethanol of a fuel
- advantages----- carbon neutral...fairly simple to
produce using anaerobic
respiration...renewable....burning ethanol produces
less air pollutioin than burning petrol
- disadvanages------industrially so not carbon
neutral....using crops like sugar cane ,maize and
wheat puts pressure on food prices which means
less land to grow food to supply growing global
population