Feasibility of Cleaner Brick Production Technology in Malawi
Executive Summary Project background Republic of Malawi is a land locked country situated
in Southern Africa. With a population of around 15
million, it has one of the highest rate of urbanization
at 5.22%. This high rate of urbanization puts
tremendous pressure on the entire building material
sector. With constraints in supply of material both
the quality of material (brick) and the application
(house) has degraded to an alarming extent resulting
in poor quality and increasing construction costs.
The main and only building material in Malawi is
“burnt clay bricks”. Use of alternate materials is
sparse, limited only to subsidized construction
activities. It has been estimated that with the current
rate of urbanization, a minimum of 21,000 housing
units are required to meet the urban housing demand.
Thus Malawi will require around 1.7 billion units of
burnt clay bricks annually. If the rural housing
demand is also considered then the annual brick
consumption will be much more.
Objectives
The current state of housing has put an immense pressure on the low cost housing sector. Most often it has reached beyond the means of common beneficiaries. To construct a 1 m2wall with traditional bricks, approximately MK 2,575 is spend which is around 70% more than similar construction with good quality bricks. Thus use of quality bricks can drastically bring down the cost of construction of a low cost housing. Keeping this in mind, Centre of Community Organization and Development, Lilongwe initiated the idea of technology transfer of Vertical Shaft Brick Kiln (VSBK) for Malawi. The major objective in this initiative was to introduce an energy efficient and environment friendly technology to produce consistent quality bricks throughout the season. Thus an assessment study was undertaken to study the feasibility of introducing Cleaner Brick Production Techniques and Methods through the implementation of VSBK technology.
The Malawian brick industry
The main building materials in both urban and rural
setting are bricks. In rural areas unburnt bricks are
common. However in the last two decades there has
been a significant shift from mud walls to burnt
bricks. In urban areas the entire construction sector
has shifted to burnt bricks. Majority of the brick making in Malawi is small
scale, unorganized activity. They are fired in
traditional clamp kilns using fuelwood as fuel. In the
entire country there are only three organized brick
industry producing good quality bricks. Brick
making activity is scattered throughout the country
but concentrated in and around the major three cities
of Mzuzu, Lilongwe and Blantyre. During the
feasibility study it was found out that the two major
concerns in the Malawi brick sector are increased
deforestation due to use of fuelwood and poor brick
quality resulting in poor construction quality.
Assessment findings
Technical
Varied types of soil were found in Malawi used in
brick making by traditional means. In some cases
black coloured plastic clays are being used to
produce good quality bricks. On the other had
extremely poor quality sandy soils are also used.
There are neither proper testing facilities nor
knowledge on the suitability of soils in brick
making.
Fuel used in firing bricks in Malawi is fuelwood. It
is estimated that around 850,000 tonnes of fuelwood
will be required to produce around 1.7 billion bricks
if alternate technologies are not adopted. No waste
materials are used in green brick making for use as
body fuel.
In Malawi traditional brick making process uses slop
moulding. The soil is dug out from the nearby
moulding area and aged with water. They are then
manually mixed and moulded. Due to slop moulding
process, the green bricks contain a high amount of
water. Faulty mould design and high water content
deforms the just moulded bricks. Shapes are also
distorted with drying cracks due to rough moulding
area also.
In some soils due to high plasticity there were high
shrinkage cracks during initial drying. To control the
drying process and avoid shrinkage cracks, green
bricks were covered with biomass. Since the green
bricks are not of uniform shape they cannot be
stacked in a proper manner. Thus green bricks were
just dumped in heaps for drying.
The entire Malawi brick industry uses open clamps
for firing. Due to poor quality of green bricks,
clamps are not stacked high enough. Most of the
clamps are small ranging from around 10,000 to
50,000 bricks. There is no control over the firing
process in the clamps. Besides fuelwood, fuel in the
form of leafy biomass is also used to provide
additional energy. However the quantity and quality
is not suitable to provide additional heat to uniformly
fire the upper layers of the clamp. Thus the brick quality in a clamp is extremely non-uniform. Only in
one area scoved clamps were seen fired in a
scientific manner. These fired bricks were of
consistent and high quality compared to the normal
clamp brick firing process.
In Malawi due to high demand of bricks, all bricks
produced are sold irrespective of quality. No class
division is made of fired bricks. Fired colour of the
bricks being produced ranges from bright red to even
soil coloured denoting unfired quality. However in
scoved clamp properly fired bricks were seen with
consistent quality. No bricks in Malawi had a
metallic sound indicating the poor quality also.
Energy and environment
All the brick making activity uses fuelwood fired in
clamps. It has been calculated that the brick industry
in Malawi alone consumes around 850,000 MT of
fuelwood per year. At this rate of fuelwood
consumption, the entire country will be deforested
within 25-30 years only from the brick industry. In
Malawi, because more fuelwood is consumed than
re-grown, the combustion of wood results in an
increased amount of carbon dioxide emission in the
atmosphere which add to the greenhouse gas effect.
In the clamp around 20MT wood is consumed to fire
40,000 bricks. For smaller diameter wood, the
consumption is more. With the kind of wood being
used the average specific energy consumption in
clamps is around 3.66 MJ/kg. This is expected to be
much higher since the required temperature and
quality is not achieved.
Business economics
The brick business in Malawi is based on market
dynamics controlled by affordability and purchasing
power of consumers. Since most of the consumers
are looking at cheaper products without any quality,
thus brick prices are also low. A burnt brick in
Malawi sells between MK 3.50 to 5. Despite the
dominance of the market with this brick quality,
there is a considerable market of good quality
product sold between MK 15 to 25. Production cost
of clamp fired bricks ranges between MK 4 to 5. Out
of the total production cost, fuel accounts for over
50%. There is also no trend for investment in the
brick making sector. Generally the investment sector
in Malawi is not matured enough. Small industries
run on private capital. However recent trends show
that the Government is encouraging both private and
public investment in the SME sector to boost the
country’s economy.
Social aspects
The working conditions of brick kilns are generally
unhealthy and unsafe. With no social security in
brick making business and activity it is generally
treated as an additional income generating activity to
earn some quick money. This is due to the
unorganized and informal nature of business. On an
average a brick kiln worker earns around MK 250
per day which is far less than the minimum
subsistence amount.
The skill levels of Malawi brick workers are
generally low. However they are extremely
hardworking and sincere. No formal skill has also
been imparted with basic skill developed through onthe-
job experience. A surprising fact was that unlike
other countries the brick industry in Malawi is
entirely controlled by male workers. No female
workforce was seen in any of the brick kiln visited.
Institutional scenario
The existence of organized brick making activity is
lacking in Malawi. There are no formal brick
associations or institutions supporting the brick
sector. Almost all the Government agencies are well
aware of the issues and problems of the brick
making activity especially the use of fuelwood.
Awareness does not exist on the use of coal for
quality brick making. The government is even
considering banning burnt clay brick to save the
environment. However it has been held under
abeyance due to lack of alternatives.
Feasibility of Vertical Shaft Brick Kiln technology in Malawi
Choice of technology
During the assessment study it was apparent that
depending upon the socio-economic conditions of
Malawi most of the technologies practiced in other
countries will not be suitable for implementation.
The basic criteria’s used to select technologies were
based on production capacity, fuel type, product
quality, investment capacity and ability to tap the
carbon market. Based on all the above criteria, the
Vertical Shaft Brick Kiln technology became the
obvious choice especially looking at the scale of
production and the fuel type in Malawi.
Vertical Shaft Brick Kiln technology is the most
energy efficient technology available globally till
date. Greenhouse gas emissions are also enviably
less making it an obvious choice for the carbon
market. Valid PDD is already available and willing
carbon investors are available. VSBK is versatile and
can be adapted to any scale of production. It
Feasibility of Cleaner Brick Production Technology in Malawi
produces consistent quality bricks with higher
returns than clamp brick production.
Technical solutions
From the technical viewpoint there are no issues for
designing and construction of a VSBK in Malawi.
All the materials required for construction, including
high quality refractory bricks are locally available.
Expert masons are also available to do a quality
construction. However during the initial couple of
years, the design and construction of the VSBK has
to be under expert supervision. This is required for
masons and engineers to absorb and practice the
critical steps required for the VSBK.
Most of the equipments can also be manufactured in
Malawi. Competent workshops also exist for the
same. The local skills available are sufficient to
develop the same with technical backup and skill
enhancement support during the initial stages.
However specialized metals required needs to be
imported from neighbouring countries.
Soil quality is suitable for producing good quality
bricks in a VSBK firing system. However proper
training needs to be given to make the right choice.
The various types of soils are also appropriate to
introduce the practice of internal fuel mixing for
producing green bricks. It has been seen that a
maximum of 5-7% by weight of internal fuel can be
mixed without compromising on the brick quality.
More than the required quantity might create
operational issues especially during the summer
months.
Malawi has one of the most suitable quality of coal
required to be used in VSBK system. With a
calorific value between 26 - 29 MJ/kg it is of
appropriate quality. Adequate quantity is also
available in the Northern part of Malawi with
explorable deposits in the Southern past also. During
the feasibility study a substantial quantity of
industrial waste materials from coal, tobacco and
other industries have been seen. Tests show a result
of around 27 MJ/kg (Duff coal) - 9MJ/kg (Tobacco
dust) making it most suitable to be used in green
brick making without affecting the quality of the
fired product.
The process of producing green brick needs to be
entirely revamped to sand moulding or semi
mechanization. This should be done without
drastically changing the social process and
acceptance of traditional green brick making method.
Semi mechanization will not only introduce quality
but also ensure proper shape and size required for
use in the VSBK technology.
The most critical factor for the acceptance of a
VSBK is the demand and supply of the high quality
of bricks to the market. More than often VSBK
produced bricks are and will be notionally compared
with those available in the market in terms of price.
Bricks produced in a VSBK will always be better in
technical terms of compressive strength and water
absorption. They will also fulfill all the required
qualities as specified in the Malawian Standards
(MBS 6:1994). The only negative issue will be the
price of the bricks compared to the locally available
ones. Thus it is recommended to devise and work
upon an extensive marketing awareness campaign
for promotion of VSBK produced bricks. An
appropriate starting point would be promotion of
“Eco Bricks” through Government systems.
Energy and environmental emissions
major characteristic of the VSBK technology is its
ability to operate throughout the year subject to
availability of green brick stock and absence of any
water logging in and around the kiln site. During
regular operation the specific energy consumption is
expected to be around 0.8 MJ/kg. With an 70: 30
internal: external fuel consumption it amounts to
approximately 55 kg of internal fuel (Duff coal) per
1000 bricks and an external fuel consumption of 30
kg (Peas coal) per 1000 bricks. This is in comparison
to the 500 kg of fuelwood used per 1000 bricks in
traditional kilns.
The most important aspect of VSBK is that it can
only be operated with coal or a combination of dense
biomass briquettes. Under no circumstances
fuelwood can be used in VSBK. Thus adoption of
VSBK will automatically arrest the deforestation
caused by rampant use of wood in all firing
technology in Malawi.
Adoption of VSBK will substantially reduce
environmental emissions. This needs to be
substantiated with stack and ambient air quality
monitoring. However no black smoke will be visible
during VSBK operation indicating the complete
combustion of coal. It is estimated (from previous
measurements in other countries) that stack and
ambient emissions will be reduced by almost 70-
80% compared to traditional clamp firing
technologies.
Financial viability
The economic and financial analysis of the VSBK
technology shows that it can be an alternate
technology to replace the clamp kilns and stop use of
fuelwood. Although the capital expenses are much
higher compared to clamp (no capex required) kilns,
the payback period will be around 2-3 years
(considering 1 year as stabilization and training
period). VSBK is expected to have its own niche
market amongst all the brick production capacities
thereby promoting the growth of SME sector in
Malawi. It is also expected that the attractiveness of
the VSBK will be more to new entrants in the brick
business since reluctance is expected amongst
traditional brick makers until and unless forced by
Government policies. It is expected that during the
initial period the acceptance of VSBK will be higher
in the three major cities of Mzuzu, Lilongwe and
Blantyre.
Promotion of VSBK technology will also be a good
financial business for financial institutions and the
banking sector. It is estimated that more than 1000
VSBK (single shaft) are required to replace the
clamp technologies only in urban areas. These will
require financing and hence a profitable business.
However this requires extensive support and policy
changes from the Malawian Government and
bilateral agencies e.g. World Bank, African
Development Bank, Standard Bank.
Carbon finance opportunities
Financial incentives known as carbon credits can be
accessed to facilitate and motivate the switch to
more fuel-efficient technologies that both contribute
to the sustainable development of Malawi and to the
reduction in global greenhouse gas emissions.
The improved fuel efficiency and the equivalent
greenhouse gas emission reduction can be
demonstrated by the improved brick-making
technologies compared to the old or ‘baseline’
technology. Once demonstrated and validated by
auditors, many brick makers can be paid for
reducing emissions. By being part of such a
programme, brick makers may be better placed to
access the initial investment required to make the shift.
Although carbon finance is a new concept with few
practical examples that are established and
generating finance, there is solid demand for credits
from Africa, particularly those that have strong
sustainable development benefits. Improved brickmaking
technologies is an eligible activity in a
recently initiated programme called African Biomass
Energy Conservation Programme that is taking place
in various African countries, including Malawi. The
programme is being developed by Hestian and
aspires to be registered by the Gold Standard Foundation.
Impact of Vertical Shaft Brick Kiln in Malawi
The various meetings and workshop conducted in
Lilongwe on the VSBK technology has created a
substantial interest amongst all major stakeholders in
Malawi. The Department of Energy Affairs,
Department of Environment Affairs, National
Construction Industry Council etc. has taken a keen
interest in the VSBK technology with options of
suggesting VSBK as a replacement to clamp kilns. It
is expected that entrepreneurs will be interested in
adopting the same due to enhanced profits and
compliance with Government regulations. Workers
will be willing to contribute due to enhanced
incomes and favorable working conditions.
Regulatory agencies will be interested in enforcing
the same since deforestation will be arrested. Thus if
VSBK is adopted only in the urban cities replacing
clamps, then it will result in:
- Saving of 850,000 tonnes of fuelwood annually
- Saving of 1,500,000 tonnes of CO2 annually
- Recurring income of USD 9 million worth of foreign exchange annually
- Creation of more than 1,000 small to medium scale enterprises in the SME sector and ancillary industries
- Creation of more than 20,000 sustainable “GREEN JOBS” thereby helping in reducing poverty
- Use of more than 90,000 tonnes of industrial waste (e.g. boiler ash and leftovers of tobacco industry, duff coal) supporting the Malawi’s contribution towards reducing pollution
- Recurring use of 50,000 tons of coal creating a business of USD 10 million within the country thereby promoting inclusive growth.
- Improving the quality of housing in Malawi and incurring a saving of around 40% from bricks and mortar alone
- Reducing the embodied energy in housing, thereby pioneering the path of energy saving in Africa
Challenges
To get the benefits of VSBK it is expected that the
Government of Malawi will play a critical role
through a “carrot and stick” approach. On one hand
it should provide the stick through stringent laws and
stricter enforcement. On the other it should also
provide the carrot through easy financing, subsidies,
awareness and promotional events.
New approaches to operational practices requires a
paradigm shift from the conventional practices and
the mentality amongst entrepreneurs of conducting
regular business thereby integrating the whole
process innovations with new technology process
and re-engineering of existing methods. Change in
mentality, technology innovations and trained human
resources are the most valuable asset of improving
the environment and benefitting the society in a
business-like manner. However the advantage of all
this can only happen if all the brick industry
stakeholders are ready to change its mind set and
working habit. All this requires extensive awareness,
widespread demonstration, intensive training and
long term technology support and making both
workers and entrepreneurs learn, practice and adopt
improved technology options.
The above is the key to the success of pilot
demonstration initiatives and can only be achieved in
time. In the absence of learning, the work force
simply repeats the old practices and therefore,
continuing learning and commitment to re-learning
are crucial for overall improvement in the brick
sector especially with regards to stopping use of
fuelwood, energy conservation, minimizing pollution
and better quality of brick.
Thus it is recommended that a pilot demonstration of
VSBK be initiated for demonstrating technical
viability and creating awareness. The pilot
demonstration is to be seen as a compliment to
initiate a larger demonstration initiative in all the
major cities and towns of Malawi with attractive
business opportunities and enhanced environmental
benefits.
|