How To Build a 100 Cubic Foot a Day Methane Gas Plant

Instructions on how to build an underground plant to digest and produce methane to be used as a renewable energy source.

| November/December 1971

These instructions are for an underground, single-stage, double-chamber plant designed to digest 100 pounds of manure every 24 hoursfive cows' worthbut may be scaled upward to construct a plant capable of producing 500 feet of gas a day. This plan comes from "Gobar Gas: Experiments in Renewable Energy Sources."  

Dig a hole 13 feet deep and 12 feet in diameter, cutting away trenches for the inlet and outlet pipes to angle down through.

In the center of the hole, pour a slab of concrete six inches thick and six feet in diameter. The composition of the concrete should be 1 part cement, 4 parts sand and 8 parts of 1 inch stone aggregate.

The digester will be built on this base from 1:2:4 concrete using 1/2 inch aggregate. The floor and walls will be 3 inches thick, giving an inside diameter of 5 feet and 6 inches. The walls will be 16 feet high and reinforced with eight 3/8 inch machine steel vertical rods and 15 horizontal rings of the same material.

Inlet and outlet pipes of 4 inch galvanized iron should be positioned before pouring the walls so that the pipes are positioned 1 1/2 feet above the digester floor and in from the walls. This is so that when the dividing wall is built across the center of the digester, each pipe will be centered in its chamber. The concrete must be tightly packed around the pipes to prevent leakage.

Another wall of brick or concrete will be built three feet outside the digester wall and to the same height (i.e. four feet above ground level). This space will be filled with an insulating material: straw, sawdust, shavings, etc.

10/24/2015 8:42:17 PM

Gday where can I get the plans for the methane gas producer cheers & beers john hall

mother earth news fair 2018 schedule


Next: April 28-29, 2018
Asheville, NC

Whether you want to learn how to grow and raise your own food, build your own root cellar, or create a green dream home, come out and learn everything you need to know — and then some!