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Vermiculture Eco-toilet Design

As part of the the open source Earthbag Village (Pod 1), we will be building and are open source project-launch blueprinting an ultra-eco vermiculture (worm composting) solid waste processing option. For county compliance, these Vermiculture Toilets also include a traditional toilet and septic option. This page discusses these designs with the following sections:

NOTE: THIS PAGE IS NOT CONSIDERED BY US TO BE A COMPLETE AND USABLE TUTORIAL UNTIL
WE FINISH OUR OWN CONSTRUCTION OF THIS COMPONENT, CONFIRM ALL THE DETAILS, AND ADD
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WHAT IS A VERMICULTURE ECO-TOILET

EVI earthbag vermiculture communal toilet, Earthbag Village Icon (EVI), Earthbag Village Construction, earthbag building, earthbag architecture, earth construction, community construction, community living, Pod 1, One Community, earth bag home, earthbag house, building with earthbags, building with earth, earthbag community, earth architecture, green living, earthbag community, earthbag eco-tourism, earth building, earth construction, One Community Pod 1Vermiculture” is the process of using worms to decompose organic food waste or feces. With this process, the waste/feces is turned into a nutrient-rich residue called vermicompost. Vermicompost residue is an excellent fertilizer because it adds organisms that are beneficial to soil and plants because they further help break down organic materials and convert nutrients into a more available food form for plants. Vermiculture also improves soil aeration and increases its water-holding capacity. All of this leads to plants that grow stronger, bigger, and are more drought tolerant and disease resistance than those grown using less natural methods.

Built twice in the North half of the village, the vermiculture toilet designs we have created contain six toilets, two of which are traditional septic toilets and four that are vermiculture solid-waste processors. They are designed with the following goals/criteria:

  • Demonstrate indoor worm composting as an option for repurposing human waste
  • Include a traditional septic for people that want one and counties that need one
  • Demonstrate the Earthbag Village as a duplicable village model capable of producing zero waste
  • Make it all DIY replicable, cost effective, dependable, and easy to maintain

The picture below shows the Vermiculture Toilets, their location in relation to the flush toilets, and the central location of these structures within the Earthbag Village and just north of the Tropical Atrium:

Earthbag-Village-Vermiculture-Toilets-View-Looking-Southwest

The One Community Earthbag Village Vermiculture Toilets | Concept Render – View Looking Southwest

 

WHY OPEN SOURCE A
VERMICULTURE ECO-TOILET

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Open source project-launch blueprinting a solution like this supports our goals for positive and permanent global transformation and creating sustainable and self-replicating teacher/demonstration hubs. It is also directly in alignment with our Purpose and Mission, our Global-transformation Pledge, and Highest Good philosophy for open source creation, sharing, and making a difference in the world.

Here is the Work Breakdown for completion of the Vermiculture Toilet designs:

Fernando Remolina (Industrial Engineer specializing in Project Management) continued with his 3rd week of managing the Vermiculture Bathroom development. This week's focus was finalizing this Work Breakdown Structure for the complete project.

Vermiculture Bathroom | Work Breakdown Structure of Steps for Tutorial Completion – Click to Enlarge

 

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KEY CONSULTANTS TO THE EARTHBAG VILLAGE VERMICULTURE TOILET DESIGNS

Adolpho MaiaMechanical Engineering Student
Betty Lenora
: Earthbuilding Instructor and Author
Christian OjedaMechatronic Engineer
Dijimba “Joss” Kabuyi IlungaElectrical Engineer
Douglas Simms Stenhouse
: Architect and Water Color Artist
Erika Yumi TamashiroArchitecture and Urban Design Student
Fernando RemolinaIndustrial Engineer specializing in Project Management
Jorge Antonio RicardoMechanical Engineering Student
Joseph Osayande: Mechanical Engineer
Karthik Pillai:Mechanical Engineer
Lin XuMechanical Engineer
Matheus Manfredini (Civil Engineering Student specializing in Urban Design)
Rizwan Syed:Mechanical Engineer
Victor Herber
: Mechanical Engineer

 

VERMICULTURE ECO-TOILET DESIGN DETAILS

The basic idea of the Vermiculture Toilet is shown below with a receiving structure large enough, and filled with enough worms, to process all the solid human waste (feces) from 40 people. Worms process/eat their way from the bottom to the top as they follow the food source and leave behind vermicompost. The main chamber is sloped towards the front so the vermicompost slides into removable chambers that can be moved and emptied using an electric pallet jack. Urine separating toilet seats and holes in the bottom of the sloped bottom of the receiving chamber remove liquids. Smells are addressed with venting, fans, and mixing in additional slow-release carbon-rich materials (such as wood chips and shavings) with more bioavailable carbon stores like leaves, grasses, etc. We’ll then use regular soil testing to determine if the resulting vermicompost is safe only for trees and non-food plants or also for food crops as other researchers (see the resources section) have shown is possible.

We discuss these details and more with the following sections:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community

Vermiculture Updated Design (2.0)

 

DESIGN REQUIREMENTS

The Earthbag Village consists of 72 earthbag hotel-room-styled cabanas measuring 150-200 ft² (14-18.6 ), plus Communal Eco-shower domes, 2 Net-zero Water-Recycling Bathroom, 2 toilet domes with the Vermiculture Toilets described on this page, and the central Tropical Atrium. Total village capacity is 160 people. 

If the vermiculture toilets are used exclusively, there will be 80 people using them. Based on our research, the average person produces approximately 0.556 lb (0.25 kg) of waste daily. So we will have a daily production of:

80 (people) × 0.55 lb (0.25 kg) × 1.1 (safety factor) = 48.5 lb (22 kg) per day

The goal is to process and use this waste in our agriculture system as fertilizer in order to achieve sustainability. There will be 4 vermiculture toilets, shown in yellow, contributing to this. There will also be two flush toilets, they are shown below in gray. In the future, flush toilets are to be eliminated in order to optimize the vermicomposting area, thereby utilizing vermiculture toilets exclusively. The vermiculture system is to be located directly underneath the toilets.

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community

 

WORM REQUIREMENTS

There are different species of commercially available worms that can be used in the vermiculture process. Here is a list. Red Wigglers are commonly regarded as the most effective worms at processing waste. They have set the standard for composters. They are more voracious than other compost worms and their ability to survive in captivity is unparalleled.

The optimal temperature for Red Wigglers to live in has been the subject of research, and the results or that study are as follows:

worm temperature details

Originally, there were some concerns regarding temperature. The proposed structure though will be built into the ground. This should make it fairly easy to keep the worm area between 55-70°F (13-21°C) as long as the doors are insulated properly. The Red Wigglers were also chosen for their ability to survive in varying temperatures, although they do slow down in the cold.

The recommended worm density can be a difficult parameter to set. One online source recommends using 0.25 lb – 0.5 lb of worms per ft². If applied to this system, assuming a density of 0.5 lb/ft² and a surface area of 60 ft², there would be 30 lbs of worms to service this system.

Worms eat about half of their weight each day. This means about 15 lbs of waste per day. If the process is to be completed in the top 4 feet of the system (a conservative estimate), the number of worms could be quadrupled, increasing the amount to 60 lb of processed waste per day. This would easily cover our maximum input calculated above as 48.5 lb (22 kg) per day. 

 

MAIN CHAMBER ENGINEERING DETAILS

The Vermiculture system has a steel and stainless steel frame as its main component. Here are the technical design details for this frame with all the component dimensions included. The frame parts are all bolted and/or welded together. We are working on design updates to eliminate all the welding.

Vermiculture Design 1 | Mainframe – Click to enlarge in a new tab

All other parts are fixed to the steel frame with bolts or welding too. The back is the main/Processing Chamber and the front is a removable Emptying Chamber. To address corrosion concerns, aluminum is used for the Emptying Chamber walls and the main/Processing Chamber sloped bottom (with the drainage holes drilled in it). Acrylic is used for the sides, front, and back of the main chamber. Initial Emptying Chamber designs included a wooden top (shown below) that would open. In the latest designs, this has been replaced with an Emptying Chamber that is removable.

Vermiculture Design 1 – Exploded View

The worms will be added to the Emptying Chamber to start processing the incoming waste. Once that chamber gets full, the main/Processing Chamber will begin to be filled. When the worms are finished composting everything in the Emptying Chamber, they will move to the main chamber. This will leave only finished vermicompost behind. The Processing Chamber will then be emptied and the waste inside the main chamber will gravity feed (or be pushed) to fill the empty space created.

The venting system will be responsible for taking the smell out of the structure as well as the chamber.

Vermiculture Design 1 | Measurements – Click to enlarge in a new tab

 

METAL FRAME ENGINEERING

The vermiculture frame will weigh 1,257 lbs (570 kg) and hold 9 tons (8.2 metric tons) of compost. Utilizing the following equation, the Safety Factor is 2.4 (this would make the structural efficiency 14.65):

Safety Factor = Breakpoint / Normal Workload

The structure can process 818 lb (371 kg) of manure in 82 days. This gives it a 3.7 processing rate. Below we can see the detailed filling process of the structure when being used to maximum capacity. The structure can handle 460 days of filling when used as the only toilet for 40 people. It will take longer to fill if other toilets are available and/or less people are using it. 

To test the frame’s ability to withstand maximum loading, the frame response was calculated using EFM routine in SolidWorks. All the members were treated like beams and all the joints were calculated. What you see below is that it will support 9 tons (8.2 metric tons) that will sit on 5 beams (3 sides, 2 central).

Below we can see the frame behavior when the structure is full:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community, frame, full load

The structure will only deform 0.05 in (1.3 mm) in the red areas, so leakage between the pieces attached to the frame will be minimal. Whatever leakage happens will also be caught by the drain below the system.

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The lowest safety factor is 2.4 to plastic deformation.

 

ALUMINUM TRAY ENGINEERING

The aluminum tray bottom is responsible for holding and transmitting all the forces to the metal grid of the frame. It is made of aluminum 3/32 in (¼ cm) thick with 25/32 in (2 cm) holes drilled in it. The holes are there to drain any liquids out of the unit and down into the floor drain below. Draining excess liquids is important for the health of the worms.  

The tray dimensions were calculated using EFM routine in SolidWorks. It was divided into four pieces of equal size to simulate the contact with the grid and to simplify the calculation.

The stress and displacement results were better than expected and the tray could be wider if we desired it. Here are the testing results:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
 

ACRYLIC LOWER-SIDES ENGINEERING

The acrylic side parts will cover the frame and hold back the waste pressure from within. We chose acrylic because it is easy to buy, assemble, and because they are impermeable.

Initially the waste could have as high as 80% water mass. We used this as our worst-case scenario. Considering this, the pressure calculations were made assuming a column of water (P=pgh). The holes in the side are to allow access to the structure with a stick to move the compost in case it gets blocked. They will be covered with rubber stoppers that can be bought in any hardware store. Sides will be bolted to the frame for support and to eliminate leakage. Here’s a graphic showing the holes and stoppers.

Vermiculture Design 1 & 2 | Side Pieces – Click to enlarge in a new tab

Engineering was calculated using EFM routine in SolidWorks. Because of the roof and ceiling slope, the height is constant along the structure, therefore our pressure distribution will vary in the x and y planes and across these side parts. The pressure equation and its distribution can be seen below:

The stress and displacement results were as expected and the 1.44 mm of displacement meet our requirements to avoid leaking between the tray and the side pieces. The graphics below show this:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
 

ACRYLIC UPPER-SIDES AND FRONT ENGINEERING

The upper parts of the sides, plus the front and back, are also acrylic sheets. They are all attached to the frame using nuts and bolts. An L beam was added to the center of the structure for additional support. 

These parts dimensions were calculated using EFM routine in SolidWorks. Like the side pieces, they will be subjected to a variable pressure along both the x and y axis.

The stress and displacement results for the upper-side pieces were as expected and can be sees in the graphics below:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community

Here are these details for the front piece:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community

Here are these details for the back piece:

Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
Earthbag Village, earthbag village construction, sustainable housing, vermiculture toilet, worm composting, composting, one community
 

EMPTYING CHAMBER ENGINEERING DETAILS

The Emptying Chamber is the front part of the structure. It is responsible for storing the ready-to-use compost. Its total volume determines the processing rate because a full unit will require it to be emptied before more waste can be added. With this in mind, the design of the Emptying Chamber:

  • Is large enough to allow the worms to fully digest the projected ongoing maximum waste volume
  • Can be regularly and easily emptied once the worms have fully composted everything in it and to prevent overflow

Our original designs using a removable door are shown below. The steel front piece was made removable and the top would open with a hinge in order to shovel the ready compost to a separate emptying tray. This tray would be transported with an electric pallet jack. The upper frame is there to allow a metal piece to slide in between and hold all the waste in the Processing Chamber (above it) if needed for maintenance.

Vermiculture Design 1 | Emptying Chamber – Click to enlarge in a new tab

 

VERMICULTURE ECO-TOILET REPLICATION DETAILS

purple gear, how this works, gear iconThis section will develop to include everything needed for replication and maintenance of the complete Vermiculture Eco-toilet Structure. Our goal is to simplify the process as much as possible by providing complete and easy to follow parts lists, cost analysis details, diagrams, assembly instructions and more. Wherever possible, we’ll also provide all information in the form of web tutorials, PDF and file downloads, as well as video tutorials.

Click the following links to jump directly to the related sections:

 

PARTS LIST

This section will list all the parts for replication of the complete Vermiculture Toilet unit. We will add these details once we’ve finished the updated design.

 

COST ANALYSIS

This section will list our initial cost projections for replication of the complete Vermiculture Toilet unit and then be updated with actual costs once we have purchased and assembled our first unit. We’ll also include here the best materials sources once we’ve identified them.

Here is our cost analysis for Design 1:

Vermiculture Design 1 | Cost Analysis

Here is our initial cost analysis for the Design 2 Emptying Chamber. An updated cost analysis for all of Design 2 is coming and we expect it to be cheaper.

Vermiculture Emptying Chamber Cost Analysis, One Community

Design 2 Vermiculture Emptying Chamber Cost Analysis – Click to open the Google Spreadsheet with the most current data

 

DIAGRAMS

Design 2 for this structure is well on its way but we need help finishing it. Click HERE if you’d like to apply to join our all-volunteer team and help us complete these designs.

Below are some of the latest development images to share how the Vermiculture Bathroom has evolved. This image (also above) shows a general overview of the latest structure, where it is located in the North side of the Earthbag Village (Pod 1), and the main-floor layout that has remained consistent though the development process.

Earthbag-Village-Vermiculture-Toilets-View-Looking-Southwest

The One Community Earthbag Village Vermiculture Toilets | Concept Render – View Looking Southwest

Here are additional views to help understand how the Main Chamber is accessed and where its placement is within the complete bathroom structure.

Vermiculture Bathroom, Humaneur, composting, worm composting, sustainable living, sustainable human waste processing

The One Community Earthbag Village Vermiculture Toilets | Concept Renders – Section Views

For design 2, we are working to eliminate the need for welding by using square sign posts as our primary construction material. They cost around $40-50 each when purchased individually but those costs can be cut down significantly when ordering in bulk.

Square Sign Posts

Square Sign Posts – Click Image for Bulk Ordering Options

Bolting everything together will allow us to more easily make changes and/or replace high-usage parts like the Emptying Chamber floor shown in green below. In a worst-case scenario of wanting to replace the entire design, we could also totally disassemble it and repurpose almost all of the parts.

Vermiculture Assembly, Vermiculture Bathroom, Humaneur, composting, worm composting, sustainable living, sustainable human waste processing

Design 2 for the Vermiculture Assembly will Replace Welding with Nuts and Bolts

Here is how the Emptying Chamber has evolved. The original design had a chamber that needed to be opened and shoveled out. The new design is completely removable and easily movable using an electric-powered pallet jack. This has allowed us to make it larger and will significantly reduce time and labor. Pins are inserted on the bottom to secure the Emptying Chamber to the pallet jack for safe transport and emptying.

Vermiculture Emptying Chamber, Removable Vermiculture Chamber

New Design for Removing and Emptying the Vermiculture Emptying Chamber

Here is an example of how the emptying chamber has evolved so it can be tipped for emptying it more easily. The details for securing the part that tips to the frame that is secured to the pallet jack for transport still need to be designed.

Vermiculture Emptying Chamber, Removable Vermiculture Chamber tipping mechanism

Vermiculture Emptying Chamber Crank and Pulley System for Easier Emptying

Here is the system for securing the emptying chambers tightly against the Main Chamber. After moving the chamber into position using the electric pallet jack, a ratchet strap applied where the green line is will allow a single person to do the final securing of the Emptying Chamber to the Main Chamber. This is important to reduce leakage and keep it in position during filling.

Vermiculture Emptying Chamber, Removable Vermiculture Chamber, ratchet strap

Securing the Vermiculture Emptying Chamber with a Ratchet Strap

If you’d like to apply to join our all-volunteer team and help us complete these designs, please learn about our volunteer requirements and fill out a volunteer application by clicking here.

 

ASSEMBLY INSTRUCTIONS

Once they are done, we’ll add here all the final assembly instructions for the Vermiculture Toilet. We’ll then update them once we construct our first one and keep adding here any additional bed designs and/or modifications we come up with.

 

ASSEMBLY VIDEOS

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VIDEOS COMING TO COVER ALL ASPECTS OF THE VERMICULTURE TOILET ASSEMBLY, TESTING, AND MAINTENANCE PROCESS – THESE HOW-TO INSTRUCTIONAL VIDEOS WILL PROVIDE STEP-BY-STEP INSTRUCTIONS FOR ALL ASPECTS OF REPLICATION AND OPERATION OF THESE STRUCTURES 

SEE OUR HOW TO HELP AND/OR CROWDFUNDING CAMPAIGN PAGE TO HELP CREATE ALL THE TUTORIAL VIDEOS FASTER

 

CONSTRUCTION RELATED DOWNLOADS

Once they are done, we’ll add here download links for all the final AutoCAD, SolidWorks, and other files for the Vermiculture Toilet.

 

MAINTENANCE AND TROUBLESHOOTING

purple gear, how this works, gear iconThis section will include complete trouble shooting plans, maintenance schedules and plans, and all other details related to the long-term care of your Vermiculture Toilet. These details though must wait until we’ve got the experience with our own units to share. Please bookmark this page and check back later. If you’d like to follow our progress, subscribe to our weekly updates blog: http://www.onecommunityglobal.org/one-community-blog/

 

RESOURCES

 

SUMMARY

EVI earthbag vermiculture communal toilet, Earthbag Village Icon (EVI), Earthbag Village Construction, earthbag building, earthbag architecture, earth construction, community construction, community living, Pod 1, One Community, earth bag home, earthbag house, building with earthbags, building with earth, earthbag community, earth architecture, green living, earthbag community, earthbag eco-tourism, earth building, earth construction, One Community Pod 1We went through several designs and even reverse-engineered a successful design before we came up with this one. Our design is inexpensive when compared to similar large-scale designs, easy to build, modifiable, and meets all of our requirements for the Earthbag Village.

 

FREQUENTLY ANSWERED QUESTIONS

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WAYS TO CONTRIBUTE TO THE EARTHBAG VILLAGE TOILET DESIGN

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