Comments on: Centralised Composting Toilets

By: Kate

Kate — Sat, 09 Oct 2010 10:41:12 +0000

I beg to differ with the previous comment. If anyone is interested, head over to The Humanure Handbook website. The author has been growing food Safely for his family for over 20 years.

You can find everything that you ever wanted to know about composting human poop, in the book which is available to read as a free pdf.

By: Jonny Lyons

Jonny Lyons — Thu, 06 Aug 2009 17:18:09 +0000

Human Waste is never safe to use on food crops, even after it’s been completely composted. Fruit trees are O.K as the crop doesn’t have any contact with the ground, but otherwise it’s a big NO! There are projects in Africa which aim to supply toilets to villages to increase the amount of land available to farm, as well as for health reasons.

By: Almostgotit

Almostgotit — Fri, 31 Jul 2009 17:12:40 +0000

My in-laws have a cabin high in the Wyoming mountains which is totally off-grid. This means water from a hand pump (or using the new solar pump!), wood heat, propane-powered fridge, and a COMPOSTING TOILET. Things are very dry up there, which help immensely with smell. The waterless toilet looks like a regular one, but operates with a little flap that opens (flushes) things into a receptacle under the cabin. The cabin itself is above ground, and the toilet installed near an outside wall, so it’s a cinch to empty the receptacle once a year or two. The compost action is encouraged by throwing a handful of peat moss (e.g. sawdust?) and some powdered microbes in the toilet once a day or so. The good part: there’s so little moisture or heat at that altitude that odor is rarely an issue. The bad part: there’s so little moisture or heat at that altitude that composting itself CAN be an issue. Not with this toilet though, apparently. The only thing I’ve noticed is that when there is a large crowd of people in holiday or weekend attendance, folks are encouraged to remember the outdoor pit toilet too (which is emptied professionally with a big vacuum-hose truck every few years… as I said, natural composting hardly occurs there. Not to mention the fact that as the entire place is built on a granite mountain, it’s hard to make pit toilets very deep…)

The soil from the compost toilet is innocuous looking and odorless, but not yet pathogen free, and therefore never used on any food crops (which won’t grow there, in any case), but just spread around the the grateful alpine trees in the area.

By: Mrs.Dirty Boots

Mrs.Dirty Boots — Sun, 26 Jul 2009 06:44:14 +0000

Hi Medina,

The key to recycling human poo is firstly not to let it run off untreated into any water ways and secondly to let it completely compost before spreading on the land. Once it’s been through the compost heap, human waste is completely safe. And, if you’re still feeling a bit concerned just spread the finished compost on your land the season before you want to plant. The worms and bugs will mix all the goodness from the compost into the soil, breaking it down even further. Even soil contains some ‘nasties’, so regardless of whether or not you’re fertilizing with humanure you should still be washing hands and veggies!

In some places they use fresh night soil directly onto the land as fertilizer but for me that’s a step too far, I’d rather know any pathogens have been destroyed by the heat of the compost heap. If you’re in Spain too, just think about leaving the compost for longer so that every batch has one summer season to be completely baked before you use it – nothing can withstand summer on a Spanish compost heap – its just too damn hot!

By: Medina Whiteman

Medina Whiteman — Mon, 20 Jul 2009 11:25:21 +0000

Hi Mrs DB

I live in Spain too and am wondering about making a compost toilet on our land, which in some ways would be great (my husband is a carpenter = lots of sawdust; we have lots of fruit trees that need manuring in autumn) but I’m still worried (perhaps purely due to conditioning by my hygiene-obsessive mother!) about the spread of illnesses…two hippy camps near us both had cholera because their human waste al ended up in a river…yuck. Anyway, not an issue for us but still, is it totally safe using your own poo on your food??

By: Bill Hawthorne

Bill Hawthorne — Wed, 15 Jul 2009 20:00:55 +0000

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By: Surbiton Flowers

Surbiton Flowers — Wed, 15 Jul 2009 15:28:58 +0000

you never think something as simple as a compost toilet could be so complicated
good luck with getting it set up, i’ve seen a few and they worse amazingly well

By: Mrs.Dirty Boots

Mrs.Dirty Boots — Wed, 15 Jul 2009 11:19:06 +0000

It depends what your water bills are like. But if you can stop paying for mains sewarage you should make great savings with a sawdust composting toilet. Perhaps more importantly you will definetely save resources whether or not you save cash

By: Self Sufficient

Self Sufficient — Mon, 13 Jul 2009 00:53:59 +0000

What about the cost of running such a toilet or is it a one off cost?

It sounds stupid but even a conventional toilet costs money to flush… not that i’m advocating on skimping on that! but I guess using sawdust in a toilet would be cheaper or not?

anyway sounds like a good alternative if it can be used as compost.