projects •  Basic facilities •  Growing things
•  Building renovation •  Sanitation
•  Energy generation •  Water


Blog entries on this subject  > >

Dry toilets

We are building composting toilets along the lines of the system popularised by Joe Jenkins, author of The Humanure Handbook (now in its 3rd edition and purchasable for download online). I like this system the most of all the ones I've looked at so far because it doesn't require the construction of a separate building (or allocating sufficient space) to accommodate a twin-chamber toilet and its composting bins below. There is no requirement to separate urine from fæces, and the composting system is efficient and designed for optimum thermophilic decomposition. It's also beautifully simple and easy to construct and maintain, and it's convenient and portable.

People became so enthusiastic about this system and their home-made units that Jenkins' toilets got dubbed "Loveable Loos" – not surprising when you consider he's employing the KISS principle – and he's now been persuaded to manufacture them for people who don't want to build their own.

Here's a video about them.

The only disadvantage to this system is that it's necessary to empty the collecting bins and wash them out on a regular basis, but the modern squeamishness about human waste products seems a bit odd to me. This isn't really any different to cleaning out the chicken coop.

Jenkins' composting method has been developed over nearly 30 years of use. He uses bins rather than heaps as the efficiency of the composting process relies on keeping the waste well contained in the centre of the material, surrounded by other organic matter and with a substantial 'sponge' of material below. This prevents smells and the likelihood of the waste leaching into the soil or watercourses in a raw state. The human waste is also well mixed with other organic material, vegetable peelings, cooking scaps, etc, which results in a more nutrittive compost than human waste + woodshavings alone (which Jenkins doesn't recommend using).

More videos from Joe Jenkins here.


Vermicomposting toilets

In spring 2013, I came across a different system for dealing with human waste based on an ordinary flush toilet. This system, pioneered by Anna Edey in the 1990s, uses worms to deal with the solid waste and plants to manage the liquid component. I decided to experiment with this system for the smaller building, and we built it during the summer of 2013. It was finally commissioned in early 2014 once we finished connecting a water supply to this side of the quinta and the worms are currently doing an excellent job.

Vermicomposting flush toilet

So good, in fact, that when a problem arose locally with a village septic tank in a protected landscape, I went to the local council with a Portuguese architect friend to suggest they adopt a vermicomposting solution to our design. Unfortunately our solution wasn't 'corporate' enough for the national conservation organisation with overall jurisdiction at the site, but the council were very taken with the domestic-scale installation here at Quinta do Vale and this vermicomposting sewerage system is now approved for use in this area under the provisions for 'septic tank with drainage'. We've overseen the installation of a system for the local junta de freguesia to replace a defective seotic tank and more are in the pipeline.

I've also given a number of workshops both locally and further afield on installing the system. It's all open-sourced and there's now a website dedicated to the system with case studies and a forum for the user community to ask questions and iron out difficulties.

© W Howard 2008-2017 | HTML5 | CSS | Website by W Howard | Hosted on 100% solar-powered webservers through AISO