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==''The Adobe''==
==''The Adobe''==


In order to strengthen the internal structure of the upper walls, an adobe like plaster was applied.  Local grasses and clay based soil were hand harvested and feet mixed in order to create a natural fibrous plaster.
In order to strengthen the internal structure of the upper walls, an adobe like plaster was applied.  Local grasses and clay based soil were hand harvested and feet mixed in order to create a natural fibrous plaster. This plaster was then applied as a structural coating to what would become a pool-like vessel awaiting its filling.


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Image:Lalagrima.paja.jpeg  
Image:Lalagrima.paja.jpeg  
Image:Lalagrima.adobe.jpeg  
Image:Lalagrima.adobe.jpeg  
Image:Lalagrima.adobe_1.jpeg  
Image:Lalagrima.adobe_2.jpeg  
</gallery>
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[[Image:Lalagrima.adobe_2.jpeg|thumb|left|]][[Image:Lalagrima.adobe_3.jpeg|thumb|right|]]
[[Image:Lalagrima.adobe_3.jpeg|thumb|right|]]
This plaster was then applied as a structural coating to what would become a pool-like vessel awaiting its filling.
 
==''The Pond''==
==''The Pond''==


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[[Image:Lalagrima.salida_1.jpeg|thumb|left|]][[Image:Lalagrima.salida_2.jpeg|thumb|right|]]
[[Image:Lalagrima.salida_1.jpeg|thumb|left|]][[Image:Lalagrima.salida_2.jpeg|thumb|right|]]
The exit pipe was designed in such a way that it would maximize the potential water height, for longer distance irrigation, while facilitating ease of draining.  The pipe itself leaves from the lowest point in the pond and incorporates two ninety degree angle elbows, the second of which determines the ponds water level.  In order to drain the pond, the vertical pipe is removed at the lowest elbow and an alternate pipe is installed, sending the water to the desired location.     
The exit pipe was designed in such a way that it would maximize the potential water height, for longer distance irrigation, while facilitating ease of draining.  The pipe itself leaves from the lowest point in the pond and incorporates two ninety degree angle elbows, the second of which determines the ponds water level.  In order to drain the pond, the vertical pipe is removed at the lowest elbow and an alternate pipe is installed, sending the water to the desired location.     


==''Finishing Touches''==
==''Finishing Touches''==


[[Image:Lalagrima.touches.jpeg|thumb|left|]]
[[Image:Lalagrima.touches.jpeg|thumb|left|]]
n order to secure the aquatic plants and assure that the water level stays below the surface, more gravel and stone were added to a height three or four inches above the water.  The idea is to not leave any exposed water that could harbor breeding grounds for mosquitoes.   
In order to secure the aquatic plants and assure that the water level stays below the surface, more gravel and stone were added to a height three or four inches above the water.  The idea is to not leave any exposed water that could harbor breeding grounds for mosquitoes.   


With the plastic trimmed, more adobe plaster was applied in order to seal the connection between the plastic and the pond. And as a finishing touch, a final layer of soil was placed over the gravel to encourage the plants’ surface root connections, as well as serving as a medium for native grasses.  
With the plastic trimmed, more adobe plaster was applied in order to seal the connection between the plastic and the pond. And as a finishing touch, a final layer of soil was placed over the gravel to encourage the plants’ surface root connections, as well as serving as a medium for native grasses.  

Revision as of 21:48, 5 December 2006

La lagrima purificadora

Organizational background

As a member of la Red de Guardianes de Semillas (the Seed Savers' Network), a grassroots Ecuadoran organization dedicated to the preservation of the traditional seed and the culture that it sustains, the Centro Orgánico Finca Sarita serves as a seed saving center for coastal Ecuador as well as an educational model in sustainable farming and ancestral living in its region.

Greywater filtration system

Along the lines of serving as a sustainable model within their community and region, coordinators of Finca Sarita were looking for a low-cost, model greywater filtration system built from local materials that could be easily maintained, repaired, and mimicked. Considering the region’s abundance of native aquatic plants and its plethera of dirt and rocks, it seemed only appropriate to utilize a greywater marsh design to fill the coordinators’ desires, this and no other center in la Red has incorporated this design into their model.

What’s in a name?

Like la lagrima (the tear), this greywater system will purifica (purify) the very essence of that which sheds it. In this case, la lagrima purificadora (the purifying tear) will not only physically purifica the water leaving this thirteen sided kitchen, but it will also metaphorically purify the heart of this center, its hearth. In line with this ideology, this system's very shape is in the form of a teardrop.

Initial System

Lalagrima.initialsystem.jpeg
Lalagrima.initialsystem 2.jpeg

The center’s initial greywater system, like that of many, consisted of a simple PVC pipe from the kitchen sink’s drain to a mulched area. The smell wasn’t horrendous, but clearly breading ground for unhealthy bacteria.

New System: La lagrima purificadora

In planning this system, the users of the kitchen estimated a daily water usage of approximately 50 gallons of water per day, a very high estimation. This estimate includes all boiled drinking water and water for cooking, cleaning, and washing dishes.

Our goal was to have the kitchen’s waste water sit for at least 72 hours in the greywater marsh. Considering that approximately 35 gallons might go down the drain per day, we needed our system to be able to hold 105 gallons of water at any given time.

Construction

Lalagrima.piscina.jpeg

Considering the layout of the proposed site, completely flat, and in order to maximize irrigation distance, it was clear that we would need to construct an above ground pond in order to gain any gravitational benefits.

The Base

With a plentiful supply of Holy stones and a good source of clay based soil, we went to work on creating a solid foundation. And why Holy, one might ask? The stones, which consisted of primarily urbanite (concrete and brick rubble) were salvaged from the recent demolition of the community church. With the new church well underway, it was commonly joked that holders of old stones will bless whatever they use them to construct, hence Holy stones.

The clay based soil was tampered into place in order to secure it and the lower rows of stone, forming a solid base from which to construct the walls.

Lalagrima.con 3.jpeg
Lalagrima.con 4.jpeg

With the foundation set, the exit pipe was put in place. The exit pipe is of 3 inch PVC and leaves the marsh from the lowest place in the pond. The final height of the exit pipe will ultimately determine the water level of the marsh itself. The idea is that with one pull of the exit pipe, the entire marsh is easily drained, allowing for oxygen to reach the roots of the aquatic plants.

The Adobe

In order to strengthen the internal structure of the upper walls, an adobe like plaster was applied. Local grasses and clay based soil were hand harvested and feet mixed in order to create a natural fibrous plaster. This plaster was then applied as a structural coating to what would become a pool-like vessel awaiting its filling.

Lalagrima.adobe 3.jpeg

The Pond

Lalagrima.piscina 0.jpeg

Using the ancient method of leveling by the string and the eye, the pond’s water level was determined. In order to secure this level, the exit pipe was cut at the desired height.




With an old salvaged, hole-less piece of doubled over plastic, an impermeable membrane created the pond base. From here a thin layer of sand was applied to cushion the weight of the following layers of gravel and stone.

Lalagrima.piscina 1.jpeg
Lalagrima.piscina 2.jpeg

As an experiment, large stones were placed towards the entry point, about one quarter of the pool, while gravel filled the rest. Our question is, in which medium do the roots of the aquatic plants prefer, the tight gravel or the loose stone?

Lalagrima.piscina 3.jpeg








To baffle or not to baffle?
In designing a greywater marsh, one is forced to ask themselves how many baffles to incorporate in
the system or should they be incorporated at all?  The idea behind the baffle, a water road block of
sorts, is to force the water either over or under the baffle, typically made of wood, on its way to 
the exit.  The theory is that the bacteria filled water will be prohibited from picking one straight 
route to the exit, instead it will be forced to meander through more of the marsh, ideally more 
finely filtering the water.  
In this design, we are experimenting with a baffle-less system.  Our thought is that since the 
pond is constantly filled with water, routes will not be chosen, but rather all water molecules will 
be forced to meander due to the low-flow, low-movement nature of the marsh itself. 
Lalagrima.piscina 4.jpeg

With the stone and gravel in place, the aquatic plant hunt followed in suite. And shortly there after, the pipes were opened and the water rushed in.

The initial set of aquatic plants consisted of four distinct varieties, one of them the all too familiar Cat Tail. The idea behind the aquatic plants of course, is that their very oxygen producing nature, once established within the marsh, will filter out harmful bacteria in the water, resulting in mostly purified water that can be used for irrigation.

The Grease Trap

Lalagrima.caja.jpeg
Lalagrima.caja 1.jpeg

The 36 gallon grease trap and its preceding solids screen are this system’s first components of filtration. Water leaving the kitchen sink is rarely alone, it is most often accompanied by food particles and, depending on cooking habits, grease.

Lalagrima.caja 2.jpeg
Lalagrima.caja 3.jpeg

In this system, water leaves the kitchen sink, passing through a removable food screen, and enters a double chambered grease trap, in the form of a brick box. The trap itself is divided into two chambers by a snuggly fit, removable board that sits two inches above the bottom of the box. The idea being that since grease floats, it will remain in the first chamber not able to advance to the second, while water only will pass through to the second chamber and beyond to the marsh. Both food in the solids trap and the grease will need to be cleaned on an as-needed basis.

Lalagrima.caja 4.jpeg
Lalagrima.caja 5.jpeg

The downside of this grease trap is that it stores, if even for only a short time, greywater, which can be a potential harmful act. This problem has only be mitigated on a very basic level. For example, the design incorporates an easy release valve, which allows for a quick emptying of the grease trap and we are currently testing the application of charcoal to see if it will prolong the time laps between emptying. Other ideas have been mentioned regarding mixing the bacteria invested water with wood chips similar to that of composting toilets. Ultimately however, this aspect of the system will need more attention.

The Exit

Lalagrima.salida 1.jpeg
Lalagrima.salida 2.jpeg

The exit pipe was designed in such a way that it would maximize the potential water height, for longer distance irrigation, while facilitating ease of draining. The pipe itself leaves from the lowest point in the pond and incorporates two ninety degree angle elbows, the second of which determines the ponds water level. In order to drain the pond, the vertical pipe is removed at the lowest elbow and an alternate pipe is installed, sending the water to the desired location.



Finishing Touches

Lalagrima.touches.jpeg

In order to secure the aquatic plants and assure that the water level stays below the surface, more gravel and stone were added to a height three or four inches above the water. The idea is to not leave any exposed water that could harbor breeding grounds for mosquitoes.

With the plastic trimmed, more adobe plaster was applied in order to seal the connection between the plastic and the pond. And as a finishing touch, a final layer of soil was placed over the gravel to encourage the plants’ surface root connections, as well as serving as a medium for native grasses.

Lalagrima.touches 1.jpeg
Lalagrima.touches 2.jpeg

When all was said and done, the pond, with its filling of stone and gravel, was calculated to hold approximately 175 gallons of water. This means that with the estimated 35 gallons of water heading down the drain per day, again a high estimation, theoretically each molecule of water will sit in the greywater marsh for approximately five days.

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