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UCLoo Festival 2013


Remembering the 2013 festival of technologies, ideas and debate about sanitation in London


Archive for the 'ecological toilet' Category

Time Out featured post

By ucesbar, on 21 November 2013

Do you know your shit? UCL sets bog standards at UCLoo Festival

Time Out has featured our Festival on their ‘blog. Read on for their view:

“Warning: if you are not a fan of toilet humour, look away now. Still here? Great. We knew you wouldn’t wash your hands of us (strap in – it gets much worse).

This week, UCL becomes the UK’s first loo-niversity as it celebrates World Toilet Day, Tuesday November 19, with a festival of poop culture (slogan: ‘Do you know your shit?’). Partly it’s to highlight the inequality of a world divided into the lavs and the lav-nots, so that the 2.5 billion people without sanitation no longer get a bum deal. But the environmentally concerned organisers say they’d also like us to ‘consider our own “flush and forget” mentality more critically’. Which we guess you’d call wee-cology.

Even better, you won’t have to spend a penny. Free events include a toilet exhibition showcasing radical new commode designs, such as one model where tiger worms dine on your droppings. Kids will be shown different kinds of crap-loving microbes. People can sign up to join a group in UCL’s ‘Makespace’ lab, where they’ll be given loads of design kit and six hours to create a brand new convenience. Visitors can trial-run an eco toilet. And… actually, we’ll stop there. There’s a limit to how many details we should give out. After all, what do you think we are? A toilet paper?

More details at cege.ucl.ac.uk. Here are three futuristic toilets and our top 10 London loos.”

“Honeysuckers” – an elegant name for a system that doesn’t work

By ucesbar, on 6 November 2013

This week’s post is by Philippa Ross, an Engineering student at UCL who is undertaking fieldwork in Africa.

Most people come to Uganda to see rare gorillas, take a safari or visit Lake Victoria, the largest lake in Africa and the largest tropical lake in the world. But I’m here for a far more exciting reason: to look at toilets. 160 toilets to be exact, and maybe a couple more for good measure!  As part of my EngD research in the Centre for Urban Sustainability and Resilience at UCL, I am in Kampala, the capital of Uganda, to study the risk to health posed by poor sanitation systems. I’ll be working in some of the poorest areas in the city, where many people live on less than US $1 per day. It’s not just toilets I am looking at; I’m interested in the whole sanitation system including hygiene, drains, solid waste and pit emptying, among other things.

Narrow streets make access difficult for pit emptying vehicles

Narrow streets make access difficult for pit emptying vehicles

In the UK we just flush and forget when we go to the toilet, but in the slum areas of Kampala people have very small income to build flushing toilets, water for flushing is scarce, and there are no sewer systems to flush into! Most people in the slum areas of Kampala use a pit latrine. But what happens when the pit is full? Space is expensive in these over-crowed areas and people can’t just dig another pit when one gets full – so they must empty the pit. De-sludging trucks (beautifully named honeysuckers!) do exist but they are expensive and cannot access many of the narrow streets in slum areas, so many pits are bucketed empty by hand and the waste is often thrown into the drainage systems – which are open and where children often play. These drains also overflow in heavy rain, spreading highly concentrated faecal matter into the local area – this practice makes me question if it was worth going in the toilet in the first place!

1. Community-made drainage  2.Woman digs drainage channel to avoid water entering her home 3. Drainage system blocked with solid waste

1. Community-made drainage
2.Woman digs drainage channel to avoid water entering her home
3. Drainage system blocked with solid waste

So what’s the big deal? Well, over 2000 children die every day due to diseases caused by poor sanitation – that strikes me as a crisis and it certainly is a chronic disaster, which can be solved simply with good sanitation systems. It is interesting that these issues are very similar to those faced in London in 1840 when cholera was widespread, people collected water from the river or shallow wells and human waste was contained in cesspits which frequently over flowed into the drainage systems – turning the river Thames into a sewer! In 1858 the stench of the Thames was so bad in London that the Houses of Parliament were forced to close and made politicians take notice.  It was gaining political support for the cause that led to the building of the sewer system in London as we know it.

Raised toilets in slum communities in Kampala – these are normally shared between 4 or more families

Raised toilets in slum communities in Kampala – these are normally shared between 4 or more families

Kampala has a population of 1.5 million and it is estimated that 60% live in slum areas, which make my 160 toilets a drop in the ocean. Looking at toilets all day isn’t everyone’s idea of fun, which is exactly the problem for Kampala City Council, responsible for sanitation in the city. They have no idea about the current sanitation situation in the slum areas, and the poor people living in these areas do not have a voice politically and cannot afford to improve their situation.

I am working in two slum areas: Bwaise III and Katwe III. Both areas are located in low-lying marsh areas, where no one else wants to build houses. They experience frequent floods and have a high water table. You can actually see where houses are sinking! The high water table adds an extra problem for building latrines – they have to be raised as a pit would collapse and contaminate the ground water. This makes building a latrine unaffordable for an individual family and therefore often 4 -6 families share latrines or use public latrines. I was surprised about how clean the shared toilets were as they are currently not recognised internationally as improved sanitation but many were in better condition that the household latrines I observed in the slums areas of Maputo, Mozambique (the other location of my research). At night time however, things get difficult if you share or use a public latrine. It is often not safe to go out at night and as a consequence people use ‘flying toilets ‘ – plastic bags or potties that often get emptied into the drains.

1. Workshop participants discuss score sanitation indicators in their area  2. Workshop group photo

1. Workshop participants discuss score sanitation indicators in their area
2. Workshop group photo

I have developed a participatory workshop that aims to collect data about the communities’ sanitation issues. The idea is to develop a link between local government to give poor communities a voice to raise their issues and to collect data which highlights poor sanitation ‘hot spots’ and can form a basis for city-wide sanitation planning. In the workshops, participants score their area based on a number of sanitary related indicators. The workshops have been great fun and the participants have been engaged and insightful. The results are triangulated and validated with results from a household survey (as mentioned earlier, my visit to 160 toilets!) which is a more traditional data gathering technique. The results are yet to be analysed, but the community commented that they thought the workshop would be more accurate as a household survey as the questions are very personal and people are embarrassed to say if they don’t use a latrine or don’t wash their hands. This supports my view that the technical engineering side of sanitation is the easy bit! Sociology, psychology and behaviour changes are the massive challenges.

So all that’s left to say is that after two weeks in Kampala I am also suffering from sanitary-related issues… Let’s just say I am appreciating the good toilet I have at my guest house. Not a good advert for a sanitation engineer!


Drinking the toilet water

By ucesbar, on 15 October 2013

This week we are happy to feature a guest blog from Emma M. Jones, author of Parched City, an account of London’s drinking water published by Zero Books earlier this year (http://www.zero-books.net/books/parched-city):

Equating tap water with toilet water may seem incongruous but in most homes they are indeed one and the same. ‘Tap’ water sounds good to cook with, to brush our teeth with, or even to shower under while taking the odd, if inadvertent, sip. ‘Toilet’ water, as ‘tap’ water soon becomes when it flows into that essential piece of technology, seems fit only to sluice our bodily waste away; once the toilet has bacteriologically degraded the fluid from potable to a health hazard.  Yet, seconds prior to the moment that it encountered the site of our daily defecation, the same water destined for the flush should have been as safe and wholesome as the law dictates to make the drinking grade.

Like the convenors of UCLoo Festival (opening on World Toilet Day, 19th November), I concur on the absurdity of this fact: ‘In London alone, more than 400 million litres of drinking water are flushed down the toilet every day.’ Reader, perhaps you are a pioneering greywater enthusiast, who has rigged dual water systems in your home at great expense. I think I am fairly safe in assuming, though, that the majority of us tend to rely on a sole plumbing system, which serves all our water-related needs. Drinking water is, therefore, for most daily users simply all water. To legally qualify as suitable for ‘domestic purposes’[1] – cooking, drinking, food preparation, washing – our tap water will have been through quite an ordeal.

Metropolitan Water Board’s Department of Water Examination, built 1938, Islington (now private housing).

Metropolitan Water Board’s Department of Water Examination, built 1938, Islington (now private housing).

From raw water’s underground or river source (the latter is more highly treated given its volatile environment), the liquid will first be channeled into a reservoir. Initially, even the decision to let supplies into this storage space may be timed to avoid pollution known to be travelling downstream, facilitated by a well-oiled communication system between the water industry and the Environment Agency. Once captured, the greatest proportion of water’s journey to potable will be made simply by settling for a period of time, which can last for weeks. A leading water scientist suggested to me that this natural process, though facilitated by the artificial space of a man-made lake, makes up 90% of water treatment – simply by adding the essential ingredients of time and space.[2] This elegant truth about the efficacy of the storage factor on producing safe drinking water was established in the first decade of the 20th century by the bacteriologist Alexander Houston, of the Metropolitan Water Board, and continues to be applied to London’s water treatment today.[3]

What has changed since Houston’s day is the sophistication of how water quality is measured, to detect minute traces of pesticides, for instance. Post-reservoir, the remaining 10% of water treatment involves an extensive à la carte menu of engineering and chemical interventions, including: aeration, ammonia, clarification, slow-sand filtration, ozonation, ultra-violet treatment, chlorination, granular activated carbon and reverse osmosis. Expert tasters, and sniffers, are also on hand to perform their duties, as are microbiologists and chemists who check the product, to ensure that what leaves the water treatment facility should be in a state to remain drinkable when it reaches our kitchen taps, and acceptable to us (a key concept).

Walthamstow Reservoirs, Thames Water, London, 2012.

Walthamstow Reservoirs, Thames Water, London, 2012.

Of all the things we use drinking-quality water for, flushing the loo has to be the most wasteful. Would we flush bottled water down the toilet? There is a vast monetary gulf between the drinking water we find in corner-shop fridges and the product from our taps, but both are the same precious freshwater resource that requires intense labour and material resources to produce.  Tap water is not on the free market like bottled water, though in essence it is the same product.

Given the sophisticated engineering infrastructure and scientific expertise that has been honed over two centuries to allow London, other world cities and many nations to produce water at drinking quality standards agreed with the World Health Organization, the UCLoo Festival’s proposals to save this resource for its intended purpose seem very wise to me.

I hope the current systemic stasis in the use of water can be ruffled by this festival’s daring design proposals, and I look forward to joining that queue to spend a penny in a dry-dock loo and giving my tuppence-worth on the experience of toileting without water.

Coppermills Advanced Water Treatment Works, Walthamstow, London, 2012.

Coppermills Advanced Water Treatment Works, Walthamstow, London, 2012.

*Please consider making a small donation to our fundraising drive at http://spacehive.com/ucloofestival2013. We have almost reached our target, but need your help to make sure this important conversation happens!

You can also find more information about the UCLoo Festival, running 19th Nov. – 3rd Dec. at UCL’s Bloomsbury campus, through our Twitter (@UClooFestival) and Facebook (https://www.facebook.com/ucloofestival) accounts.

All photographs author’s own.

[1] The Water Supply (Water Quality) Regulations 2000 No. 3184 (UK: The Stationery Office).

[2] Parched City, Emma M Jones (Hants: Zer0 Books, 2013), page 240.

[3] Ibid, pages 111–16.

Sun, sand and Shigella sonnei: toilets at a desert festival

By ucqnklo, on 11 October 2013

Last year, I got a call asking if I wanted to build infrastructure for a thousand hippies at a festival in the desert [1]. Of course I said yes. I was offered a selection of projects, but the idea of building the least romantic items on a site filled with sparkly-eyed astrologers, plus the many opportunities to play with power tools, appealed to me; so Toilet Lead I became.

The festival [Nowhere: http://www.goingnowhere.org/] is hard to describe. A relative of the Burning Man festival in Nevada, it brings together about a thousand people in the remote Los Monegros region of Spain, to build from nothing a commerce-free, self-reliant community of artists that flowers for a week before being returned to pristine wilderness. All that you need you bring with you; water comes in cubes, food in tins, and waste is taken away with you afterwards. A harsh environment packed with revellers might sound challenging for toilet construction, but, just as armies march on their stomachs, festivals scrape along on their bottoms; which is where I and toilet crew come in.

The site before the festival gets rolling: mostly dust and dramatic scenery.

The site before the festival gets rolling: mostly dust and dramatic scenery.

The sanitary arrangements we have been using up until now are simple and compost-based (they are in need of a redesign; read on for why): basically boxes seated atop deep holes. As they get used, scoops of dust are tipped in, to ensure a balance of solids and liquids suitable for the ‘humanure’ to break down. This covers up faecal matter, hopefully preventing insects from touching down in the waste, and also, happily, smells.

I got together at a carpenter’s workshop in Hackney with our head builder, Monkey; some carpenters who knew what they were doing and a sanitary technician, to design a better, stronger, easier-to-build free-standing toilet cubicle. The bloom-and-bust nature of the festival means that many of our structures are based on the flat-pack, turning sheets of plywood into structures that will withstand the depredations of over-excited festivalgoers. In practical terms, this meant slicing a lot of squares and rectangles with newly-acquired circular saw skills, and jigsawing even more notches to interlock them.

Both myself and Monkey are rock and roll fiends, so there was no name for our toilet model but ‘Elvis’, although naming the various parts of the design did give some difficulty. Key base struts were clearly Jerry Lee Lewis and Chuck Berry (though, thinking about it, we did miss the opportunity to call one the ‘stray cat’); the particularly annoying one to cut was dubbed Millie Small, after the helium-pitched, lisping sugar-addict of the period. Finally, we had a working model; now to make 13 more.

Fast forward to July and I took a series of buses out to the nearest town to the festival, arrived a week before the hedonistic hordes and got building. I buttonholed a couple of woodworkers, some people keen to learn about power tools and some skilled in measuring, marking out and obsessive checking. Then my dedicated team and I laboured for a week in the heat and sawdust and whirring of machinery to churn out 13 brand new ply poop palaces. Interposed with duties such as digging trenches to stop storms flooding out sewage – a picture which, once it had been vividly explained, proved quite motivating – and trying to pry the finished items out from under the brushes of the artists enthusiastically decorating them so they could be deployed around the site, we finished this Herculean task and let the incoming sparkleponies at the Augean stables.

Me with the Elvis toilet, designed, built and decorated by myself: with much help from my talented friends.

Me with the Elvis toilet, designed, built and decorated by myself: with much help from my talented friends.

And then, among the acro-balance workshops, storytime sessions and dance-offs, some people started getting diarrhea, vomiting, and other intestinal distress. It spread. In this semiarid region, where water is a precious resource, cooking is done in field kitchens, toilets are rough and ready, and people are in holiday festival mood: there are plenty of opportunities for disease to get around.

Following the event, professional epidemiologists (you get all sorts of specialists at these festivals) studied the outbreak, and found evidence that at least some sickness was caused by Shigella sonnei bacteria. This virulent gastro-intestinal disease can require only 10-100 bacterial cells to spread further, with cells being shed by infected parties for up to 4 weeks afterwards. Together, this meant that despite copious amounts of sanitizing spray, regular bleach spray-downs, and the skilled attentions of the medical staff on site, many people were ill during and after the festival.

It’s likely that there were a number of causes of sickness on site. However, poorly washed hands and insects were very likely carriers of infected cells to new victims. Yes, that’s infected cells shed from someone else’s intestinal lining into diarrhea, and then getting in people’s mouths. While faecal-oral transmitted disease is officially gross, everyone did recover and was eventually OK.

We were relatively rich, privileged Bohemians living temporarily low-tech with hand-crafted compost toilets, and we learnt the hard way that sanitation is crucial. When things went wrong, we tried our best attempts to contain it, to provide copious bottles of sanitizer, to isolate sufferers, to block up every chink a fly could get through; but we still couldn’t stop it. We were lucky with the excellent Cruz Roja on site, and the healthcare in our home countries. We were lucky that we were already healthy, well-nourished, and had the clean water we needed while recovering.

Many people aren’t so lucky: they build for themselves and their communities and support themselves in the way we play at doing, but they don’t have an established sewer system to come home to, or gallons of potable water to throw down it.

We are treating this sickness outbreak as the close call it is, and looking at ways we can step up our sanitation. We need a system people can use hygienically, no matter how much they have enjoyed themselves recently; that insects cannot enter and spread infection from; that can tolerate the spectacular storms; and that can be removed and allow the environment to gracefully return to how it was before we came out. That’s for our short-term event.

The world needs a new toilet made for modern populations, not Victorian Britons. We all deserve safe sanitation, and even from my few weeks in the desert I learnt water is precious. Sanitation is fundamental. It is within the grasp of engineers, designers and people with plain old good ideas to do it; but we need to accept it’s a problem, and get working. It doesn’t get simpler than that.

*Please donate to UCLoo Festival – just £5 or less will help – to make sure this conversation happens:  http://spacehive.com/ucloofestival2013 But hurry – there’s only one week left to reach our fundraising target!

[1] Technically it’s not a true desert, due to having rainfall. It’s a semidesert. But it has typical temperatures in the mid-thirties, pushing into forties; it’s dry, starkly beautiful, and dusty as hell, so most people stretch the term.


Toilets – the unexpected issue

By Tse-Hui Teh, on 1 October 2013

I definitely did not expect to be talking about toilets; to anyone, at anytime. Not that it was a taboo topic, I just never identified it as an issue. I was never particularly scatological; I didn’t have a fear of flushing, and I never had a problem going. The queue for the ladies’ was probably my biggest concern until a few years ago. Then the toilet issue just grew.

Chee Kit Lai design

Chee Kit Lai design

I was researching the urban water-cycle. More particularly, how to equitably share and effectively use water resources throughout the community and the environment. Working in London, it was inevitable that I would quickly bump up against the toilet. About one-third of our daily water use goes down the toilet. Yes, one third – that’s approximately 50L of fresh, treated drinking water pumped directly to your point of use that is being used to move and dilute valuable fertilizer (your pee and poo). This is ludicrous and unbelievable in an age of sustainability, environmental protection, and shortages of both water and phosphorous.

But was it possible to change this? Were there any other outraged souls out there? Was anyone willing to change? And if so, how?

And that is how I started to talk about toilets.

It’s been an interesting journey so far. Waterborne sanitation is less entrenched that you might think. My research found that there were people in London who did care about their water consumption, but because the flushing toilet was so prevalent, they resourcefully altered their habits to encompass “yellow mellowing” to save water.

If you don’t know, the ditty is, “If it’s yellow, let it mellow. If it’s brown, flush it down.” I’m not sure where it started, the various urban myths are somewhere in California or Australia. In any case, it just means you only flush after a poo. What was strange for me is that more people did this than I expected. As I started talking to people, more of them ‘outed’ themselves as closet yellow mellowers. What a surprise!

The problem with “yellow mellowing” is that this is not seen as the proper way of using the flushing toilet. This is why “yellow mellowing” is usually done in the privacy of the home, and it is typical to run around and flush before having guests. This covert contradictory behaviour is not an optimal way of saving water, nor does it make it easier to harvest the nutrients from human waste as fertilizer.

Once you are on this line of thinking to save water and nutrients, most people see that the next logical step would be to make a non-flushing toilet system. This would make non-flushing the correct way to use the toilet because there is simply no flush to use. By not flushing, fertilizer could also easily be reclaimed.

This is amazing. These people, who use a waterborne sanitation system, thought it could be improved. The infrastructure is not as entrenched as I had imagined.

But this is not the end of the story. After this, the question is how would you collect the waste? It used to be the nightsoil man, but what would the alternative be in a contemporary city? Where would the collection points be? How would you effectively harvest the nutrients? Where would the fertilizer be distributed to? How would you stop it from smelling? How would you keep it hygienic? Who would manage it? How many people would need to change their toilet system to make this a viable option? Would other people also see it as a better option? What would make people change their toilet system when most people don’t even think about where the water comes from and where the waste goes? And a plethora more questions to be asked!

Your thoughts are greatly appreciated. What do you think it would take to change?

Chee Kit Lai design

Chee Kit Lai design

Have a say on the blog and come along to the UCLoo Festival, opening on World Toilet Day (19th November), to try out a vacuum flush toilet that only takes 200mL per flush, see some new prototype toilets and waste treatment systems, see how UCL researchers are answering some of these questions, and apply for the make-a-thon so that you can join in the creativity of answering some of the questions. Please also donate to UCLoo Festival – just £5 or less will help – to make sure this event happens:  http://spacehive.com/ucloofestival2013 But hurry – we must reach our fundraising target by 17th October!

I look forward to hearing your thoughts and to seeing you at the UCLoo Festival!

Composting Toilets and the Coast Guard: an unlikely love story

By ucft590, on 10 September 2013

The hull of a steel deck barge is one of the last places I would like to be in the sweltering August heat in Virginia. Yet this is where I found myself during the summer of 2009 while I installed the below-deck components for the vessel’s two composting toilets. The barge was not yet in the water, perched on steel beams alongside the shipyard’s waterfront construction area, so I thankfully didn’t have to contend with the water’s movement. However, it wasn’t the most ideal of building situations. Getting to the underside of each toilet was an adventure in itself: I had to crawl into the hull through one of the top deck hatches then navigate through the maze of steel frames that formed the structure of the barge. Since there was a temperature difference between the interior of the hull and the warm, humid exterior air, beads of condensation continually formed within the hull. Working inside the cramped and dark compartments, illuminated only by my LED headlamp, I felt like I was spelunking in a futuristic cave.

The Learning Barge

The Learning Barge

As the Project Manager for a sustainable, floating classroom and field station called the Learning Barge, I found myself in some unusual and wholly unimagined situations during the design/build process from 2007 through the vessel’s first operation season in 2010. The Barge was conceived as a demonstration tool for non-profit The Elizabeth River Project, to educate students and adults about their local watershed along the Elizabeth River, one of the most polluted tributaries of the Chesapeake Bay. It showcased a wide range of recycled products (reclaimed road signs were used as cladding), sustainable strategies (a rainwater collection feeds a bio-filtration station), and renewable energy systems (wind turbines and photovoltaic panels provide power). Since we wanted to feature a number of green technologies, the integration of composting toilets was essential for the Barge’s “head” (the name for a toilet on a boat, traditionally named since they were located at the head of the vessel so that passing waves could clean the drainage pits). Although composting toilets are becoming more common for personal watercraft, they are rarely used on commercial or industrial vessels.

Marine toilets are inherently different from their land-based counterparts since they do not have the option of being connected to sewer systems. Therefore most marine sanitation systems are adapted versions of chemical toilets that rely on either a bag system or a ‘pump-out’ for the removal of waste. Neither of these systems are ideal: they utilize toxic chemicals and, until the imposed regulations of the Clean Vessel Act of 1992, it wasn’t uncommon for vessel operators to incorrectly dispose of their waste by simply dumping the chemically-treated contents directly into bodies of water. The toilets of the Learning Barge, two 12VDC Envirolet Waterless Remote Systems, consist of three main elements: a toilet, a composting unit, and a ventilation shaft. The small electrical fans within each of the composting units operate 24 hours a day and 7 days a week, allowing heated air to travel through all six sides of the waste, thereby facilitating rapid evaporation and accelerating the compost process. This is unlike many composting systems, that only have one aeration side (the top). During the regular operational season of the Barge (March –November) the toilets require daily attention: the manual aerator within the composting unit (similar to a rake) needs to be pumped and the blackwater tank needs to be monitored.

I installed two waterless, composting toilets

I installed two waterless, composting toilets

With drawings, product documentation, and a detailed operations manual in hand, complete with instructions for what toilet paper to use and procedures for both the start of the season and winterisation, we thought that Coast Guard approval of our composting toilets would be one of the easiest components of the certification process. Yet the uniformed officers were skeptical:

  • How could we ensure that the system would work?
  • What were we going to do with the waste?
  • Would it smell?

The last question was one of the oddest: toilets on ferryboats are rarely pleasant. Over the course of several site visits, we managed to convince the Coast Guard representatives that composting toilets weren’t such a crazy concept for a vessel. We were using a proven supplier, a sturdy unit, and we had outlined every step within the composting process, including specifications for compost disposal in accordance with the Virginia Department of Environmental Quality (a permit was needed for all compost produced outside of residential settings).  With questions answered, our vessel received certification in September 2009 and later that autumn, the members of the Coast Guard independently toured the vessel and its sustainable systems as part of a training exercise. Today, in the Code of Federal Regulations for vessels, there are a number of composting toilets approved as Marine Sanitation Devices (MSD).

*Please also donate to UCLoo Festival – just £5 or less will help – to make sure the conversation on ecological urban sanitation happens:  http://spacehive.com/ucloofestival2013 But hurry – we must reach our fundraising target by 17th October!

Click here to learn more about the composting toilets used on the Learning Barge:


Click here to explore the current environmental endeavors of the Learning Barge:


You can also learn more about the design/build process of the Learning Barge:


The Centre for Alternative Technology

By ucesbar, on 28 August 2013


CAT specialises in ecological sanitation

As part of the preparations for the UCLoo Festival 2013 (19 Nov. – 3 Dec.), the project team spent an afternoon at the Centre for Alternative Technology (CAT) near Machynlleth, Wales (please donate to UCLoo Festival – just £5 or less will help to make sure the conversation on ecological urban sanitation continues:  http://spacehive.com/ucloofestival2013 But hurry – we must reach our fundraising total by 17th October!)

The centre is a “living laboratory” for past and present green technologies, exhibiting lower-environmental-impact alternatives for energy, building and plant cultivation.

The centre is also known for its forward-thinking research on ecological sanitation, and we were introduced to four functioning ecological toilets:

1. A low-flush, tiger-worm model developed for Tanzania by Claire Furlong and Walter Gibson at Sanitation Ventures filters toilet liquids through layers of soil and gravel. Worms living in the top layer digest the solid matter, replicating the filtration system of a forest floor.

  • Pros: it’s an odourless, attractive, self-contained unit.
  • Cons: because the toilet was developed for a warmer climate, it needs lots of insulation to keep the worms warm enough to do their job.

Sanitation Ventures’ tiger worm cosy


2. The Aquatron, from Sweden, uses a water-efficient (2/4L) system, flushing toilet contents down a pipe into an hourglass-shaped plastic basin that separates the liquids from the poo through gravity-propelled spinning. The solids then fall through a flap into a composting chamber beneath.

  • Pros:  it’s water-efficient, odourless and looks like a standard toilet.
  • Cons: the composting chambers (there are two, allowing each to “rest” for two years before the compost is used) are accessed on an angle and require someone to enter the chamber in order to empty it.
Aquatron's water efficient model uses a 2/4 litre flush

Aquatron’s water efficient model uses a 2/4 litre flush

3. NatSol‘s version is a double-chambered composting toilet with a ride-on bench seat, that separates the urine from the faeces, whisking it away down a pipe while the solids fall into the pit below.

  • Pros: no water is used, and urine can easily be collected for re-use with a urine-diverting plate.
  • Cons: because waste is contained and there is no flush removal system, the toilet smells if it’s not regularly treated with “soak” material (sawdust, straw etc.) to keep it dry.
  • Undecided: only sitting is allowed.
NatSol's bench seat

NatSol’s bench seat

4. The Australian-made DOWMUS (Domestic Organic Waste Management Utilisation System), another composting system (installed with an enamel pedestal), is designed to accept all household waste water. However at CAT, a urinal is also provided, to reduce the level of liquid entering the compost pit.

  • Pros: smells are removed through a pipe-and-fan system.
  • Cons: because the mixture remains wet through the mixing of urine with feces, the toilet container does not compost the matter in the cold Welsh climate, so it fills with raw sewage which must be emptied periodically.
DOWMUS' composting system

DOWMUS’ composting system

At CAT, faecal waste is composted and used as garden fertilizer once it reaches a safe level of decomposition. Although regulations do not prevent certain uses of nutrient-rich urine in farming, pee at CAT is not currently harvested for use but instead is processed through soak beds, using reeds with nitrogen-rich roots to purify the liquid, which eventually reaches bathing quality.

Our tour guide, Grace Crabb, was very knowledgeable and well-informed, and we hope she’ll visit and perhaps even give a talk at the upcoming UCLoo Festival!

The project team and our guide at CAT

The project team and our guide at CAT

Welcome to UCLoo Festival 2013

By ucesbar, on 30 July 2013

loo lady

Hello, and welcome to the UCLoo Festival 2013 blog!

The UCLoo Festival 2013 will celebrate the global toilet revolution in the heart of London. More than 2.6 billion people in developing countries do not have access to a safe toilet, and flushing toilets use water, one of our most precious resources, to wash away our dirtiest waste. The world needs a new toilet, and the UCLoo Festival will showcase the latest revolution in public health and sustainability.

As we get closer to the Festival (taking place at UCL Bloomsbury Campus 19th November to 3rd December) we will keep you updated with blog posts from our project team, UCL academics, sanitation experts and all-round toilet enthusiasts.

UCL is a hub for research on water security, environmental governance and sustainable urban design. The project was initiated with support from UCL Engineering, the Bartlett and the Grand Challenge of Sustainable Cities. The UCLoo Festival 2013 will bring awareness of how today’s sanitation systems contribute to London’s water shortage and will highlight the importance of sustainable alternatives.

Keep checking back here for updates, and don’t forget to follow us on Twitter (@UCLooFestival) and like our Facebook page (search for UCLoo Festival). You can also support us via our Spacehive fundraising page! ** URGENT UPDATE: with only one week left to fundraise, we still need to raise 16% of our target! Please give what you can – even £5 or less will help – to make sure this conversation happens:  http://spacehive.com/ucloofestival2013 But hurry – we must reach our fundraising total by 17th October!

Thanks and see you soon,

UCLoo Festival project team