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Back in September of 2016, I started a thread on Biogas, asking if anyone here had experience. It was an interesting thread, that you can visit if you CLICK HERE.
I have been doing intermittent research on this topic, for some time now. I have learned a few things about biogas and biogas production.
Firstly, we wouldn't need to raise pigs for that purpose, although we do want a few here for our own pork. Cow dung, it seems, is commonly used to start a biodigester. After a few weeks, we could begin adding food waste. Food waste is in plentiful supply, almost anywhere in this country. Just visit any market and you can get old vegetables and other foods from vendors, that will just throw away what has not been sold. We started doing that for our BSFL ages ago, after realizing we could not produce enough waste to supply their consumption needs.
Secondly, biogas production is low pressure and extremely safe to produce. I've seen everything from 208 Liters plastic barrels, to IBC totes, being used as biodigesters.
Thirdly, once we get the numbers fine-tuned, we could produce enough to cook most, if not all meals here at the farm. And, once the initial investment has been made, it would cost nothing, nada, zero dollars, to produce the gas.
Basically, you need a tank to serve as the biodigester. You also need a "one-way valve" to prevent air from entering the biodigester via the production line. This can easily be made from a canister filter, like those used for water filtration systems for homes. You also need a scrubber, to help eliminate other gases present from production. The scrubber can be made from PVC pipe packed with steel wool, so as to clean, filter, and scrub the gas you want to exit at the burner. Gas storage vessels can be made from a plastic drum, a truck inner tube, or even a large, sealed plastic bag. All components can be manufactured from parts available right here in Cambodia.
The primary gases produced are: CH4 - Methane, C02 - Carbon Dioxide, and H2S - Hydrogen Sulfide. The latter, H2S, would only be in trace amounts, and can be reduced by maintaining proper a proper PH level in the biodigester, and through scrubbing. In the end, you can produce a very clean burning fuel, delivered at low pressure, clean burning, and odorless.
For anyone interested in undertaking this as a project, you can view the resources I have compiled thus far, by CLICKING HERE. They are hosted on my OneDrive Cloud account.
It's been an interesting trail to follow, for sure. I imagine this will be a project to add to the list.
From Phnom Penh Post Thursday 2nd MAy 2013 By Danson Cheong and Mom Kunthear Rice farmer Cheng Leng used to spend hours scouring the forest surrounding his Kampong Speu farm for firewood, which then had to be dried for the better part of a day before he could use it.
Today, a cistern-like structure behind Leng’s home has spelled the end of the labourious process. When Leng wants to boil water or cook food for his family of seven, all the 60-year-old farmer has to do is flick a switch and his methane-powered stove sputters to life. Read More Here (and a good photo of construction)