AfriGadget

There are few things that make me madder than seeing lorry loads of charcoal going into schools, hospital and other institutions in Kenya. These places are wrecking havok on our natural environment because they need energy for cooking  - but wont use clean (but more expensive) options like butane gas. Another thing that really irks me is the plastic waste that is taking over our country, it is disgusting, unhygenic and am environmental disaster that we not only drive by, or walk past every single day - we contribute to it through our negligent shopping habits (how many times does a lump of butter have to be bagged in Nakumatt?).

So when one of Kenya’s youngest architects, Mumu Musuvo and his boss Jim Archer told me about the Kibera community cooker two years ago I was very interested. They were looking for funding from the company I ran. I studied the design and took in the environmental implications, saw the potential but my company was not biting. We turned his company, Planning Systems down but I’ve been secretly monitoring the project which was adopted by UNEP and launched earlier this year.

This post is a massive send out to Planning Systems to congratulate them for being highly commended by judges in the Energy, Waste and Recycling category at the 2008 World Architecture Festival in Barcelona, Spain - it’s reported here on CNN. The communal cooker is turning rubbish into fuel to feed residents of one of Africa’s biggest slums, Kibera, 

 

Garbage is brought to the community cooker by volunteers shovel itinto one end of a giant concrete oven. At the other end are the hotplates where the community cook and boil water. 

“It might smell a bit but it doesn’t make  our food taste any different,” says Virginia Wamaitha, as she pours sugar into her steaming pan of chai – the gently spiced tea loved by Kenyans. “It will taste just like chai should.”

 

The garbage to fuel oven is sponsored by UNEP as one way to clean up Kenya’s slums while reducing dependency on wood and charcoal to protect forests. The community cooker burns garbage and generates heat for sterilizing water, for ovens used by community groups, as well as individuals. The original concept was that a kikapu (basket) of garbage would equate to an hour of cooking time on the stove. 

What kind of garbage? Any, plastics, food wastes even clothes - anything that will burn really! But doesn’t that produce toxic fumes you ask?? This is what’s so clever about the project. Using technology that I don’t understand the oven burns at temperatures of up to 930 degrees F. which basically detoxifies many hazardous pollutants.

“It uses a superheated steel plate inside the incinerator box to vaporize drops of water. The oxygen released then helps burn discarded “sump” oil from vehicles – itself a pollutant in the slums – driving temperatures higher”.

The process is simple enough to be controlled by locally trained volunteers.

According to UNEP this is the first of its kind, and it cost $10,000. 

Personally I think it’s a brilliant  idea, a great solution to slum garbage disposal, water treatment and hygiene (hot water an be used for community showers, to clean toilets, and to cook meals - therefore is safer (no more unstable jiko’s with pots of boiling water that kids tumble into on the floor). Plus the cooker can be used for commercial purposes - womens groups are using the cooker to produce baked products like queen cakes (you know the ones - “coke and keki”

Imagine if this could be replicated in slums around the world, in IDP camps like Kakuma, Dadaab, and in hospitals, prisons, and schools. 

Don’t let me blow their trumpet - help share this important story. You can read more praise for this project here  and Rob Crilly on CS monitor has a detailed article here and its also here on Sustainable Development International website here and on Sustainable Footprint here

When you visit Diani Beach, Kenya’s version the Florida keys, look up and you’ll see 20 rope bridges swinging over the highway - what’s that little bulge with a tail? Before you flash by, you will realise that it’s a monkey sitting up there. Yes it’s watching you! And then, a burst of action as an entire troop of black and white might start galloping across the wildly swaying bridge!

Colobridges were built by the Colobus Trust to save the rare Angolan colobus monkeys from road traffic accidents

Faced with a crisis that could eliminate the species in Kenya, innovative solutions were tried from Lollipop stick men at major monkey crossing points, roadsigns to slow down the speed, and education for taxis, stickers in matatus (local buses).

The bridges were the most successful. Designed locally and made of cable, rubber and PVC, each bridge takes a day to erect and costs about $500. The bridges connect two of the monkeys favourite trees on either side of the highway.

Being naturally shy, the colobus initially stared at the bridges gadgets with disdain until the more inquisitive and daring Sykes monkey began to see the logic. Once the Sykes and even vervet monkeys started using the bridges, the colobus followed suit, and are now very comfortable with their arboreal walkways.

This is an Amazing video of Colobus crossing a “colobridge” (Warning this video is GREAT but the link take you to another site - so read on first or you”ll miss the Australian madness)

There are now 23 ‘Colobridges’ and it’s estimated that they are used 150,000 time a year by at least three different species of monkeys! Amazing because there are only 300 of these Angolan colobus monkeys left in Diani where road kills are now rare.

Not for everyone: Bridges have also been deployed in Zanzibar to save the crazy looking Kirks red colobus but it looks like they aren’t clever enough to use them (some species are just slow)! Check out the photos of a confused monkey here

My plug for my favourite primate “Hug a colobus today”.

Colobridges go global or ‘Australia steals our African ideas’: Though they don’t admit it, the “colobridge” innovation inspired rope bridges to save freaky creatures in Australia too

Of course the Aussies always do things bigger and better… check this one out!

Google Earth is one way to appreciate the crush in Kibera, Africa’s largest slum. Not surprisingly popular images of people living in desperate conditions aren’t far from the truth when it comes to this corner of Nairobi - but out of the madness comes a little hope.

I witnessed some amazing innovations in Kibera and conclude that people have adjusted to their situation and are making the most of it.  Because of the stress associated with limitations on land, energy, water, and food the people have found innovative ways of surviving. This post is mainly about farming.

Vertical farming

like this guy and his vertical garden which feeds his family and he even sells some produce. It’s a variation on what JKE wrote about in the post on Keyhole gardens in Botswana.

Finding land in rubbish

Now a local organic farming company Green Dreams has been documenting the progress of transforming a garbage dump to an organic farm on the Green Dreams blog. They are working with a local youth group comprising reformed criminals in converting garbage into organic manure, and garbage dumps into organic farms.

Irrigation taps the mains water and supplies nutrient rich feeds from organic fertilizer produced on the site from crops and worms, yes they harvested local earthworms to start vermiculture.

Check out the planting implements, a PVC Pipe adapted to deliver seeds into a perfectly dug hole!  This was invented to help with the back breaking work of planting.

After 3 months the community of 30 families were harvesting, eating and selling organic produce. Yum! Impossible to ignore how a dirty dump turned green, everyone wants a farm in Kibera now. This group is now selling their expertise to raise funds and help others.

Natural Bean Tenderizer

There was a smouldering fire where banana leaves were being reduced to ash, then the ash dissolved in water and the brown murky astringent solution sold for Ksh 50 ($.80) per 250 ml in vodka bottles! This is a bean tenderizer reducing the time to boil red kidney beans by 50%! Imagine the savings on charcoal/fuel.

Safe Dispensing of Fuel

Notice that there was no protection around the farm or it’s equipment. Apparently the reputation of these ‘reformed criminals’ is enough of a deterrent.

Life might be hard in Kibera but yet when you visit you can’t ignore the vibrancy, colorfulness, camaraderie amongst the inhabitants it was one time that I got the feeling that people here love life

Bush camping is one of the greatest pleasures of living in Kenya – only if you have the right equipment. On a recent hastily planned trip to Lake Magadi hot springs we discovered too late that we’d forgotten the jiko (charcoal cooking stove). Stopping in Magadi town which serves only one industry, the Magadi Soda Company, we had one made for us right there and then in a very active jua kali workshop.

I always wondered where the metal for jiko’s came from - In this the many discarded gas cylinders are chopped into segments to make up the body of the jiko.

There seems to be no power shortage here, a mess of electric cables and metal and wooden waste remnants from the soda company is an active business for about 20 artisans making furniture, gates, and jikos for the staff of the soda company.

A ten minute job turned out into a one hour event and a thousand shillings later ($20) we take off proudly with our extremely heavy stove. That’s when we discover that there is no charcoal to be had in this part of the world anyway. We ended up with a 3 stone fire.

At dinner time we realized that we’d forgotten most of the food anyway (camping note to Paula: don’t believe him when he says “I already put it in the car” ).

Nevertheless, the hot springs were fabulous.

The Jiko came home and has not yet been used - and thinking about it now … should I be worrying about cooking on something made from gas cylinders? Is it just iron or could there be lead in this?

Or How to get your camel milk to market in 40 degree C climate.

My brother Dominic Wanjihia invented this gadget which he calls Fine Lined Evaporative Cooler, for rural application in Somalia - the cooling of camels milk for transportation . He was working on a project for VETAID, Somali Pastoral Dairy Development Program - SPDDP,in Burao, Somalia June 2008. All this content belongs to Dominic who has allowed me to post it here- please seek his permission to use this content elsewhere dwanjihia@yahoo.com

Evaporative cooling technology

The evaporative cooling concept has been used for centuries in countless applications. Cooling occurs when a fluid changes state from liquid to vapor. Put simply, evaporation. In order to evaporate, the liquid requires energy or heat. It acquires this heat energy from its immediate surrounding. As the surrounding gives up this heat, it lowers in temperature or cools.

The rate at which evaporation occurs depends largely on two main factors, the amount of heat available and the humidity in the air.

The cooler must also be shaded from direct sunlight otherwise the surfaces absorb UV heat and warms up, becoming ineffective as a cooler.

In short

Evaporative cooling devices work most efficiently in windy, dry and shaded conditions

Charcoal cooler

Everyone knows how to make charcoal fridges. After carrying out extensive tests on evaporative coolers in hot arid Burao, Somaliland, with day temperatures as high as 36^OC in the shade, the charcoal would absorb ambient heat from the air and as opposed to cooling, would warm up the interior compartment.

Imagine wearing a wet thick winter jacket under the palms at a breezy beach. The jacket acts as a wetsuit and will insulate your body preventing heat from escaping.

Fine lined cooler

However, imagine wearing a wet skintight t-shirt in similar conditions. The water evaporates quite rapidly and cools your body.

I applied this concept to the cooler prototype pictured and achieved startling results. The cooler would drop as low as 15.5^OC at night when temperatures averaged 25^OC and maintain under 17^OC during the day at average temps of + 32^OC.

Construction

An elevated metal box is lined interior and exterior with a fabric. In this case I used locally available corrugated galvanized iron sheets for the container and sisal sacking fabric for lining. The upper ends of the fabric overhang in a water trough that rings the top of the cooler. Capillary action causes the water to slowly trickle over the inner and outer surfaces. A small vent keeps the interior air circulating and wind guides or tunnels direct air flow over the exterior surfaces. A low speed small solar powered fan can be incorporated in areas where there is not a constant breeze.

How it works

The circulating air in the interior causes evaporation on the wet surfaces. The necessary energy is acquired from the contents hence cooling them and is transfers to the iron sides.

Wind guides or tunnels direct an airflow over the external sides. The evaporation that occurs acquires energy from the sides causing further cooling of the interior.

Construction design

Cool-box with water-bath interior for rapid milk cooling application– Collection Point Cooler

Walk-in cold-room for vegetable storage

Vehicle mounted for long distance transporters

Features (Comparison to conventional charcoal coolers)

Very simple construction

Corrugated galvanized iron or GI sheets increase the surface area

Wind tunnels guide air flow efficiently over evaporation surfaces

Air flow coolers at tunnel entrances

Being galvanized, the sheets are long lasting

GI sheets are affordable and available in most rural areas

Secondhand sacking fabric is available in virtually every vegetable market

The simple capillary action dripping system replaces more complicated dripping apparatus

Convection current system to increase water-bath cooling efficiency

In hot arid regions, cooling the warm ambient air before it reaches the wet evaporation surfaces increase efficiency. Note. Setup for airflow from either direction

For further information and other rural development concepts and innovative designs, Dom can be reached on

mobile tel +254 722 700 530 dwanjihia@yahoo.com

On a recent trip to the worlds greatest natural wonder (well, ok, one of!), the wilderbeeste migration in the Masai Mara, we had the pleasure of discovering an extraordinary bush vehicle repair outfitters in the lovely slum village of Talek, after our extortionately expensive rental car suffered from not one, but three flat tyres.

If you haven’t been to the Mara during the spectacular migration, then you might find it hard to imagine our frustration - try rousing 5 kids and 4 adults at 5 am, pack them and lunch and head off to the Mara River to witness for the first time in our lives, the crossing of thousands of wilderbeeste, zebra, gazelles, lions, - images of crocodiles leaping for the bleating calves … adrenaline racing with anticipation…..and then “poof”, a flat, right at the edge of the Mara reserve.

No big deal right - just change the tyre and continue. Five minutes delay? No, 3 hours later,  we’re screaming at the rental agent because the key for the spare tyre’s lock does not work! Aaarrrggghhhh

With second car we head to Talek hardly expecting to find an outfitter who can repair tubeless tyres.

This is what we found.

A modified wheel barrow full of silty water and a bit of detergent to find the holes. We stopped counting a  15 - it was very depressing! I don’t even remember  going over a thorn bush either!Should have been my first warning - these tyres were seriously worn and thin.

The air compressor system comprised a tank and engine and a compressor unit - the last part was an adaptation from an airconditioning unit off a vehicle! Very creative.

In the end we had to opt for converting a tubeless tyre into a tube tyre - and this is the gizmo that was used to remove the tyre. It was completely home made and very effective. We found an old inner tube with just about the right dimensions at one of the tented camps, 350 shillings and 3 hours later we were on the road again!

It was well worth the hell to get to the crossing point - and of course this is where we experienced puncture no. 2! Crazy place for a puncture as you aren’t allowed to step out of your car while animals are crossing. Hours later It was back to Talek jua kali puncture repair for us!

After 3 days of stunning experiences we headed back to Nairobi on what may easily be described as the worlds worst road. That was where the new tubed tyre went totally bezerk on us and exploded ripping the tube completely in half! Turns out the tyres were so worn that the wires in the tyre  simply ripped the tube open. Nice one!

We discovered that the spare lock could be opened with a good whack! with a tyre spanner and off the lock fell. Away we went.

Words of advice to anyone renting a 4×4 to go on a major trek to Mara or anywhere in Kenya - check everything  before you go, take rental company managers personal cell no with and make sure you have credit and full phone charge, take a second car if you can, and a fundi (without my brother I’d probably still be on the road side - thanks a million Dom!). Despite the annoying hassles of the rental car and the unbelievable road, the trip was well worth it. I refused to pay for the lost day and was so glad to see the back of that damn rental car - the agency didn’t quarrel.  Gonna buy my own safari car now.

Hello - I’m new to Afrigadgets and look forward to sharing the interesting innovations we come across every day.

A small group of innovative conservationists have come up with a solution to save the Virunga National Park in eastern Congo from destruction by charcoal producers who are devastating the forests to serve the needs of Goma’s burgeoning population of displaced people.

Their approach to ending the dependence on charcoal is to provide an alternative form of energy - briquettes made of organic wastes. Here are some photos of the gadget and results!

“The beauty in these briquettes is that they are made from what has been considered, up to this point, waste. Furthermore, the material is available locally, so there are virtually no transportation costs. And, once the burn characteristics of the briquettes are understood, they burn very similarly to charcoal. If introduced to the marketplace properly, the presence of biomass briquettes should dramatically reduce the consumption of illegal forest charcoal. That’s good for mountain gorillas and people alike”. Robert Williams from Ending Charcoal

Indeed as I write the briquettes are on sale at half the price of charcoal and are selling well. It has been calculated that with 100 presses at work at once, the dependence of the town of Goma on charcoal will be ended (though they do have to find alot of trash for it)! The technology is available elsewhere but I’ve yet to see it put to use so successfully for such an important social and environmental cause.