SGEV Coil Digester project plan

General Plan:

Build and test a prototype pilot-scale biogas digester.

Features:

Designed to digest starches and simple sugars as opposed to manure.

 

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Pinch valve details

Pinch valve: Gear motor rotates lead screw, moving nut (and attached slide gate) up and down. Lowering the gate pinches 1″ I.D. Silicone rubber tubing shut. Raising it, opens the valve. The L298N H-bridge motor controller provides a simple inexpensive way to reverse the direction of rotation of the motor. (see also earlier rough ideas at Arduino stepper motor controlled slurry pinch valve)

Advantages:

  1. Able to handle solids / slurries without clogging.  No moving parts in contact with liquid, no maintenance.
  2. Inexpensive: computer controlled automation for < $100/valve.

Resources, details / how-tos:

Arduino Wiring Diagram

Gear Motor with Lead Screw and nut coupled to shaft

Slide gate attached to nut: Moves up and down on shaft to open or close valve.

Assembled valve body. Motor on top, slide gate inside, silicon tubing runs through.

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How to make ethanol

This video shows how to make 100% ethanol from sugar using a table-top electric distiller.  (Idea: I could measure the energy input using a kill-a-watt meter.).  It produces (using 4 distillation runs) ~92% ethanol, then shows 3 methods to get it to 100% – or suitable for vehicle fuel.  This guy also sells the distillers and 3A molecular sieve (zeolite) used to get 100% alcohol.


This video shows how to make a homemade still from a pressure cooker, hot plate, couple of pots and misc tubing & fittings from Ace hdware.


Simple animated video describing industrial ethanol production methods…

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Arduino stepper motor controlled slurry pinch valve

Motorized Pinch Valve

Some ideas for a motorized pinch valve using a geared stepper motor controlled by an arduino (for example. or PLR? or raspberry pi?). Need to design and print mounting brackets, gearing mechanism, linear actuator, etc. Design parts in (e.g.) Autodesk fusion 360, print on 3D printer.

Rationale/demand: Pinch valves are good for slurries, fluids containing solids that would clog other valves. Low cost: Existing motorized valves are very expensive.


3/4″ ID x 1″ OD Silcon® Tubing- US Plastics Item #: 54042

premiumaquatics.com  – Source for Silicone Rubber Tubing 1″ ID
$7.99 per foot
Item #: MC-5236K29


Idea for moving pinch valve blade up and down in housing: Found at: http://hackaday.com/2015/11/26/upgrading-a-3d-printer-with-a-leadscrew/

Quoting from image source…

Threaded rod is not designed for accurate positioning — it’s primarily designed to be a fastener. You can have issues with backlash, wobble, and they usually aren’t even perfectly straight — not to mention they gunk up easily with dirt and grime. In other words, you’ll never see a threaded rod on a commercial machine. Enter the lead screw. Lead screws are precision machined components used for pretty much all proper CNC equipment. They have almost no backlash, they’re perfectly straight, and they allow for higher load transfers without jamming.

In order to upgrade his Prusa i3, [Daniel] designed and printed his own z-axis carriages to use with the lead screw.  If you have a Prusa i3 too, he’s uploaded the design files to Thingiverse. And there’s plenty of info on his blog with instructions on how to do it.


Stepper Motor with 28cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase


Example of an existing (air driven) pinch clamp


Another example: Like this pinch valve but turned by high-torque stepper motor driving linear actuator instead of manual knob.

 


A 3D printed pinch clamp found at http://www.thingiverse.com/thing:28447/


A large commercial pinch valve example…


Free solids modeling software from Autodesk (free for students, hobbyists, < $100K/yr startups…)  Use it to design valve body…

PDF User Manual for Fusion 360

1. Click on this link to download the zip file of all the sample files associated with each Module. Upload them in Fusion 360.
https://myhub.autodesk360.com/ue29c9141/shares/public/SH7f1edQT22b515c761e12e3a50ab9cda319

2. Begin the training by going through each module in ascending order (01, 02, 03, etc). You can view them in the browser or download them locally.

PDF Modules
01 Introduction https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
02 Sketch https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
03 Sculpting https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
04 Model https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
05 Manage https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
06 Assemble https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
07 Render https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
08 Drawing https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…
09 CAM https://myhub.autodesk360.com/ue29c9141/shares/public/SH7…

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Arduino stepper motor controlled slurry pinch valve (Older)

Some ideas for a motorized pinch valve using a geared stepper motor controlled by an arduino. Need to design and print mounting brackets, gearing mechanism, linear actuator, etc. Design parts in (e.g.) Autodesk fusion 360, print on 3D printer.

One idea…

Another idea

Another example linear actuator mechanism…

prodcut-image

3d printed rack and pinion

https://reprapchampion.com/products/
NEMA 17 High Torque Stepper Motor 78 oz-in  $12.49

http://www.instructables.com/id/Stepper-Motor-Easy-Driver/
Stepper Motor Easy Driver

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Serenity Gardens Eco-village Plot Plan

Here is a link to a plot plan (1 MB pdf) of Serenity Gardens Eco-Village. It was current as of November 2013.

sgev for fb

SGEV for FB

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SGEV Sinkhole – Water reservoir

Idea:  Explore feasibility of damming the gully below this sinkhole, and using the resulting lake or pond as a water reservoir. Potential advantages include:

  • Positive way to control seasonal flows, site drainage and prevent further erosion damage. Working with the land, turning a liability into an asset.
  • Better use of land. Far more volume/capacity than using a bulldozer to build a pond on flatter (and thus more valuable for other purposes) land.
  • Depending on flows: Build a slow sand filter (details here) and pump station adjacent to it or just below. Or an “artificial aquifer” (details here).
  • Filtered water can either be pumped from this reservoir to lots above, or gravity fed to lots below.
IMG_1491-sinkhole

Sinkhole at NE corner of Lot 35 / NW corner of Lot 31

Location on Plano

Location on Plano

sinkhole.pdf

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SGEV Gray water treatment

A good greywater recycling page — general info and links to other systems: http://greywateraction.org/content/about-greywater-reuse

Another good graywater resource: http://www.greywater.net/

Artificial aquifer Tube Well: A way to filter pond or surface water:
http://www.povertyenvironment.net/sites/default/files/pep-files/Artificial%20Aquifer%20Brochure.pdf

aquifer

Engineers without borders: A good page full of links to resources:
http://my.ewb-usa.org/project-resources/technical-resources

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