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Power required for the abattoir operation is obtained by a biogas generator. Hot water
required for cleaning the abattoir is done using biogas. Dumping slaughter house waste has
reduced resulting in lower methane emissions to the atmosphere.
The activity was able to demonstrate that the abattoirs were unaware that they are: (a)
dumping a valuable resource which was contributing to greenhouse gases (CH4 emissions); and
(b) contributing to the contamination of ground water which was already in short supply due
to the adverse impacts of climate change.
One tonne of animal waste produces over 100 cubic meters of biogas which has a concentration
of 65% CH4 and 35 % CO2. The potency of Methane is about 21 times that of CO2 in trapping
heat in the atmosphere. This would translate into approximately 1500 cm3 of greenhouse gases
emitted from the dumpsite from around 15000 kg waste per day, over and above the emissions
from previous dumping.
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Daily, over 300 cattle and 100 goats are slaughtered and delivered by the 4 abattoirs for a
fee.
In addition to the population of 4,000 living within 1 km radius, the nearby Thogoto forest
supports a floating population of nearly 10,000 - pastoralists bringing cattle, traders and
others in slaughter services. Most of the 3,000 odd abattoir workers commute daily, mostly on
foot from nearby areas.
40% of the abattoir area populace lives in the 2 km long Kware slum along the river Kabuthi.
Anaerobic digestion of slaughter waste would uplift the living conditions of the urban poor.
Biogas for cooking would ease the financial and social burden of these families and reduce
deforestation and land degradation.
Electricity generated from biogas can provide employment to local youth and women, resulting
in less pollution and environmental contamination and healthier life for the poor residents.
Abattoirs have electricity, but as electric heating is costly, floor cleaning water is only
warm. Hot water reduces the water required for cleaning. Total water use in all plants is
20,000 l/day. Daily amount of wastes generated from Dagoretti abattoirs is over 15 tonnes.
With the activity, the amount of wastes to be flushed out will be much less. Water can be
heated by biogas burners or by heat recovery from generators and help in sustainable water
use.
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More than 30 % of the 40 million Kenyans live in urban centres, where access to commercial
energy services ranges from 20 % to 40 % only. Agriculture and horticulture being the main
source of revenues, Kenya has enormous amounts of agro waste. This can be very beneficially
used as feedstock in digesters to get biogas for cooking and generating electricity.
The two stage biogas digester technology is widely used for commercial power generation in
Europe and USA. The design was adapted by UNIDO to meet local African requirements (ease of
replication, up-scaling and maintenance) and can be implemented in any place where organic
waste ( food waste, market waste, fish waste, slaughter house waste, agro waste, chicken or
animal manure) is available.
In the functional model implemented in Nairobi, only a fraction of the waste of one abattoir
was used. Based on the success of the model, the Government of Kenya has requested that the
programme be upscaled to process all the waste generated in the cluster, as was already
indicated in the feasibility report.
Scientists and Engineers from the Kenya Industrial Research and Development Institute (KIRDI)
were involved in the implementation from the very beginning of the activity, which enabled
UNIDO to transfer the know-how and skills to local technicians, so that the maintenance,
replication and up-scaling process would be very smooth.
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