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Solar CITIES open-source design for a remarkable system that turns all food waste into natural gas and liquid fertilizer. According to the tutorial, you’ll never have to buy fertilizer again. The gas is piped to a stove for cooking.

The system is a form of biomimicry, essentially recreating an animal’s digestive system. The “stomach” is a 1,000 liter plastic international bulk container (IBC), with three pipes inserted into the top—one for feeding, one for gas outlet and one for liquid effluence.

Every time you add material into the “plug-flow digestor design,” which optimizes hydraulic retention time (the amount of time things are digested), an equivalent amount of fertilizer will come out.

The nutrient-rich “bioslurry” is ideal for hydroponics and can be diluted with graywater at 10:1. Sludge is minimal; the tank can go years without having to be pumped out.

The gas can be stored in PVC balloons or bladders, which are then piped to a stove.

All food waste can be fed to the system, including meat and grease. Just grind or mash with water, even dirty or soapy. You can install the digestor under a sink dedicated to grinding food scraps.

In hot climates, paint the digestor black to keep the biogas system warm. This will also prevent algae from growing, which would produce oxygen and kill anaerobic organisms doing the digesting.

Insulate the system in a cold climate with Styrofoam and stretch wrap, or, even better, foam spray. You can put it in a greenhouse and use PEX heating coils connected to a source of hot water, like a solar heater.


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DASH cryptocurrency and The Free Thought Project have formed a partnership that will continue to spread the ideas of peace and freedom while simultaneously teaching people how to operate outside of the establishment systems of control like using cryptocurrency instead of dollars. Winning this battle is as simple as choosing to abstain from the violent corrupt old system and participating in the new and peaceful system that hands the power back to the people. DASH is this system.

DASH digital cash takes the control the banking elite has over money and gives it back to the people. It is the ultimate weapon in the battle against the money changers and information controllers.

If you'd like to start your own DASH wallet and be a part of this change and battle for peace and freedom, you can start right here. DASH is already accepted by vendors all across the world so you can begin using it immediately.

Justin Gardner is a peaceful free-thinker with a background in the biological sciences. He is interested in bringing rationality back into the national discourse, and independent journalism as a challenge to the status quo.