New SATO Connection System for Twin-Pit Pour Flush Latrines

  • mchalej
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New SATO Connection System for Twin-Pit Pour Flush Latrines

Dear SuSanA colleagues,

I am pleased to announce an exciting addition to the SATO product line. On September 1 we will be launching the SATO Twin Pit Connection System in India. This new product replaces the common p-trap and completely eliminates the Y-junction box, allowing the piping to be laid out in straight lines in a "V" configuration. It improves performance, reduces water consumption by 80%, virtually eliminates the possibility of blockages, AND reduces the overall cost of construction. You can see how it works by downloading the video at the link below. Like the Original SATO, it was developed with support from the Gates Foundation. More to come...

Jim

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  • mchalej
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Here is the video link....
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  • JKMakowka
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

This looks like an excellent product, and that it can be used with a standard ceramics pan will for sure ease adoption (although maybe not at the very bottom of the pyramid). Any info on the expected price-point for small scale sanitation entrepreneurs?

Will it be also available in Nepal?

Unrelated to that: are you also working on an easy to install and clean urinal?

Krischan Makowka
Microbiologist & emergency WASH specialist
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

My understanding is that human feces is very sticky, and will stick to and clog a pipe unless there is a lot of flush water. This seems reasonable to me from little experiments I've done with mud, which is less sticky than feces. Has this system been tested with actual users? Does the system work?

It seems like a very good idea if it doesn't clog.

Dale Andreatta

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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Even low flush/pour flush can be conveyed short distances in pipes, provided the slope is just right (not too steep AND not too shallow...). They have got the distance and slope right, this looks excellent. I love the mechanism for switching from one pit to the other. Are they pits or have they figured out vermifiltration?

Dean Satchell, M For. Sc.
Go-Eco Sustainable Solutions
www.go-eco.co.nz
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Thanks to both for your comments.

Dean is correct. There is no no issue flushing through a straight, 110mm pipe of 1-2m in length. This is the big advantage of the system. It allows the twin pit latrine to be constructed with short, straight pipes - no bends or junctions to develop clogs.

It could also be applied with vermifiltration, but the intended application is twin composting pits. We also have a single outlet system launching in September, which is very well suited for vermifiltration, septic tanks, etc. See attached image.
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Kris,

Thanks for your comments. Final retail pricing is still TBD, but will certainly be below the INR 460 average cost of constructing a junction box (see www.mdws.gov.in/handbook-technical-options-site-sanitation ).

We do plan to establish distribution in Nepal, and will someday have urinals available. The vision is for SATO to be the first complete brand of bathroom products for off-grid, developing country applications.

Jim.
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Dear all SATO designers,

This looks like an amazing product, congratulations !!
Will it be constructed locally ?

Looking forward to see one in action.

Ben
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Hi Jim, I'd like to ask about the specific purpose of these twin chambers. It looks like wet composting whereby the intent is for lack of soakage to be overcome by rotating when buildup of liquid/sludge fills one side?

Capacity comes at a cost and for sanitary "compost" the resting period is critical. The faster the pit fills the greater the required capacity which increases cost.

The more favourable the pits are for worms, the more dramatic would be reduction in buildup of solids. However, any excess of liquids would be unfavourable for digestion - adequate drainage being the key to rapid digestion. Seems to me that if those pits were wider and shallower, then you'd have the same capacity but increased soil surface area and therefore improved percolation... to directly improve digestion and extend rotation length or lower cost. If the environment were optimised for worms, the solids would get digested rapidly, allowing rotation every 3-5 years and producing a sanitary compost.

Also, by lining your pits with shadecloth the soil surface would not become "sealed" with sludge because the bricks would isolate the contents from the soil and only liquid would filter through to the wall soil surface for soakage. What was the space between the bricks and clay wall filled with? I guess I'm just wondering if there is active work on optimising this system for rapid digestion?

The SATO diverter is a fantastic innovation, I'd like to see systems in place that really take advantage of it so sludge becomes a thing of the past. Now that would be more than just a fantastic innovation, that would be nothing short of revolutionary.

cheers
Dean

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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Yes. It will be manufactured in India.
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Re: New SATO Connection System for Twin-Pit Pour Flush Latrines

Dear Dean,

Twin Pit Pour Flush Latrines have been utilized in India for at least 40 years. Roughly 50,000 per day are currently being constructed under the Swachh Bharat Mission. Our intention was to develop something that would eliminate some common breakdowns and enable them to be implemented and operated more effectively, not to change the composting mechanism or basic operating principle itself.

For background information on twin pit latrine construction and composting process please see reports from World Bank and India Ministry of Drinking Water and Sanitation below.

World Bank Report
India MDWS

Thanks,

Jim
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