Simple urine valves to control odour on waterless urinals or on urine diversion toilets

  • KimAndersson
  • KimAndersson's Avatar
  • Senior Expert at SEI working on sustainable sanitation, integrated water management and resource recovery
  • Posts: 61
  • Karma: 9
  • Likes received: 27

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

[Start of Page 4 of the discussion]


Dear Ababu and all,
I really like the experiences you have been sharing in this thread. I think it is important that we always see how we can minimize odors from urine diverting systems. In the best case we can find inexpensive locally available simple measures and materials, as you are suggesting.

I would also like to share some personal experience I have had on this topic when I worked with a project in an indigenous community in Colombia, a couple of years ago. We also tried using condoms as odor trap, but we didn’t find it to be a very feasible solution, since the material is very thin and becomes quite unpleasant fairly quickly. What we did was taking the tube of bicycle tires. In our case we could acquire these old tubes for free in bicycle repair shops.

The tube is cut to create a ten centimeter long hose. Starting from one of the short edge (where the tube has been cut), you make few centimeters cuts along the long edge, on opposite sides of the tube. I’ve tried to show this on the image below. Then the uncut side is pulled onto the urine pipe or possibly also onto the pipe of a funnel (which I haven’t tried though). This creates a very functional trap, that we found to be working as well as some of the odor traps used in some of the industrially produced urinals on the market (presented at the beginning of this thread). By adding this tube at the end of the pipe, it is not necessary to have the urine pipe entering deeply into the container, which is good, since this often makes it a bit tricky to change containers.



Looking forward to hear more about your innovations on low-cost odor control!

Best regards,
Kim

Kim Andersson
Stockholm Environment Institute
Postbox 24218,104 51 Stockholm, Sweden
This email address is being protected from spambots. You need JavaScript enabled to view it.
Attachments:
The following user(s) like this post: Florian, HAPitot
You need to login to reply
  • former member
  • former member's Avatar
  • Posts: 92
  • Likes received: 0

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

Dear Kim:

I really appreciate your innovation and have to admit the rubber is much better than ours in terms of its durability. This is something worth trying.In our project we have also employed more durable material tied to elastic bands such as wrapped tennis balls that are wrapped with plastic bags and then tied to elastic bands as well as wrapped cotton wool ( wrapped with plastic bag) and tied to elastic bands. Both work quite well. I have a question though: is the bottom horizontal base of the rubber sealed so that the urine flows only through the cut vertical edges? Otherwise why is it necessary to cut the edges because the urine can simply pass through the base? or will it not pass?

++++++++
Note by moderators: This post was made by a former user with the login name Ababu who is no longer a member of this discussion forum.
You need to login to reply
  • KimAndersson
  • KimAndersson's Avatar
  • Senior Expert at SEI working on sustainable sanitation, integrated water management and resource recovery
  • Posts: 61
  • Karma: 9
  • Likes received: 27

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

Dear Ababu,
Good question about the need of the cuts along the side. The bicycle tube is left open towards the bottom, so there is no problem for the urine to pass. However, making the slits along the sides (as I indicated in the image in my last post) produces two flaps. This way you avoid creating openings at the side, which happen if you don’t make the cuts. The two flaps will stick together after the passage of urine and create a perfect seal. I hope this explanation makes more sense.

If you attach this piece of rubber at the end of the urine pipe where it enters the collection container, there is no need (in my experience) for any other odor control earlier in the system (i.e. in the urinal or in the UD-toilet), since this will avoid gases being ventilated up in the pipe system. Of course it is always important to try to keep the urinal/urine bowls clean from urine as well, which regularly could be done by adding some drips of water. You are probably aware of the possibility to use a small PET bottle with a small hole in the cap to make a good cleaner, just consuming very small amounts of water (see photo that I took in a operation and maintenance workshop in Bolivia).



All the best,
Kim

Kim Andersson
Stockholm Environment Institute
Postbox 24218,104 51 Stockholm, Sweden
This email address is being protected from spambots. You need JavaScript enabled to view it.
Attachments:
You need to login to reply
  • KaiMikkel
  • KaiMikkel's Avatar
  • Toilet Activist
  • Posts: 129
  • Karma: 3
  • Likes received: 45

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

Kim - This is brilliant! Thanks so much for sharing. :)

Kai Mikkel Førlie

Founding Member of Water-Wise Vermont (formerly Vermonters Against Toxic Sludge)
You need to login to reply
  • former member
  • former member's Avatar
  • Posts: 92
  • Likes received: 0

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

A good, air tight, urine odour trap has been designed by our project team using rubber seal and elastic rubber that are combined with a tennis ball. It has been provided to the urinals of the UDDT provided at the car wash center in Mbabane city, Swaziland. A pdf file description of the odour trap is provided below.


This attachment is hidden for guests.
Please log in or register to see it.


++++++++
Note by moderators: This post was made by a former user with the login name Ababu who is no longer a member of this discussion forum.

This message has an attachment file.
Please log in or register to see it.

The following user(s) like this post: AquaVerde
You need to login to reply
  • linusdagerskog
  • linusdagerskog's Avatar
  • Research fellow at SEI interested in scale and sustainbility of productive sanitation. Main experience from Burkina Faso, Niger, Ethiopia and a co-owned farm in Sweden
  • Posts: 8
  • Karma: 2
  • Likes received: 6

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

Reading this thread made me think about the odour traps we installed in water less urinals in some offices in Ouagadougou, Burkina Faso back in 2008 when I worked there. The attached file gives some examples with photos and explanation.
This attachment is hidden for guests.
Please log in or register to see it.


It was using the u-bend or loop principle with some paraffin oil added to the urinal, which stays on top of the urine. The u-bend or loop part of the pipe was just hooked on the wall and could be detached and lifted and when deposits needed to be rinsed out. New oil was added some every few months as needed. Paraffin oil can be found at pharmacies, and has no smell and is a mineral oil so it doesn't oxidize. Maybe it works just as well with cooking oil or other available oils - we didn't try.

At least for the 2 years more I stayed these simple traps were working, I don't know about the present status...

Regards
Linus

This message has an attachment file.
Please log in or register to see it.

You need to login to reply
  • former member
  • former member's Avatar
  • Posts: 92
  • Likes received: 0

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

Dear Linus:

Very intersting and clever setup. This set up certainly works. I feel that the oil might be temporarily mixed with the urine when urine passes through the tube but the oil will be boyed up immediately and seals the top. The length of tube is also important because the tube space must provide enough volume to hold the mixture of urine and oil while the previous urine is being displaced out of the tube space. I also think the tube acts as tube settler (in the floating sense) and am wondering if there is an optimum angle for faster sepration. I am currently experimenting if vegetable oil can work.

++++++++
Note by moderators: This post was made by a former user with the login name Ababu who is no longer a member of this discussion forum.
You need to login to reply
  • JKMakowka
  • JKMakowka's Avatar
  • Just call me Kris :)
  • Posts: 972
  • Karma: 35
  • Likes received: 316

Re: Simple urine valves to control odour on waterless urinals or on urine diversion toilets

When working with vegetable oils, another factor is their different melting temperatures. Coconut oil for example turns into a butter like solid below 20°C or so.

Microbiologist & emergency WASH specialist
You need to login to reply
  • canaday
  • canaday's Avatar
  • A biologist working toward sustainability
  • Posts: 366
  • Karma: 18
  • Likes received: 142

Re: Simple urine valves to control odour on waterless urinals with a soil filter for the air

Hi everyone,

I have designed a Christmas present for you and the whole world.

It is a simple Waterless Urinal with no odors, since the funnel connects to a hose that goes to the bottom of the jug and the displaced air has to filter through fertile soil, thus cleansing any odors. It is made with recycled materials, aside from an inexpensive plastic funnel.

inodoroseco.blogspot.com/2015/12/un-nuev...inario-sin-agua.html

This is a great way to waste less clean water, not contaminate rivers, and conveniently store fertilizer to later give to our plants.

I look forward to seeing your comments and suggestions.

Best wishes,
Chris Canaday

Conservation Biologist and EcoSan Promoter
Omaere Ethnobotanical Park
Puyo, Pastaza, Ecuador, South America
inodoroseco.blogspot.com
Attachments:
You need to login to reply
Share this thread:
Recently active users. Who else has been active?
Time to create page: 0.755 seconds