Sunday, April 10, 2022

Filtering biogas with water to reduce its carbon dioxide content

 Filtering biogas with water may fulfill two needs:

  1. Biogas mostly consist of CH4 (methane) and CO2 (carbon dioxide). So, filtering with water could lower the percentage of CO2 in your biogas so that it has more CH4 with higher calorific value and shorter time for cooking. Higher CO2 percentage mean you may have much volume of biogas but with little percentage of CH4 end up with longer cooking time. Only CH4 is flammable and not CO2.
  2. Lower CO2 content in your kitchen when cooking inside own house mean healthier environment.


Sunday, March 27, 2022

Leak test for biogas digester

Actually leak test should be done before actual run or after you finished fabricating the digester.

Or if you want to perform in the middle of process by putting soap water at joins to see whether are there bubbles formed.


If you cannot do those above just simply paste adhesive like silicon etc or similar adhesive onto all joints to make sure no leaks.



Wednesday, February 23, 2022

Basic Feature of a Biogas Digester

BASIC FEATURE OF A DIGESTER
  • Feeding inlet (with or without valve)
  • Biogas outlet (valve recommended)
  • Slurry outlet (valve recommended)
It is normal when you find different people suggesting different design and feature based on their unique experience encounter biogas system suitable to their own understanding, comfort and ease of use.


 

Saturday, February 5, 2022

How to Modify a Gas Burner for Biogas

PLEASE REMOVE THE GAS JET USING SPANAR (REFER TO PHOTO) 



OR MAKE BIGGER HOLE THROUGH THE GAS JET. WATCH VIDEO 1 2 & 3 TO UNDERSTAND THE PROCESS!


or


or



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How To Run An Engine Without Gasoline



 

Biogas For Beginners: Off Grid Eco Power a DIY Guide

 

This book is a straightforward guide for the complete beginner!

In less than a day you will learn:

◆ That you don’t have to high gas bills anymore
◆ That you can easily make free gas for cooking & heating
◆ That you can save money and help the environment at the same time
◆ And much, much more!

It’s incredibly easily to build your own methane gas biodigester. You can create a limitless supply of free gas for cooking, heating and running generators in your own back garden. All it takes is a few low-cost pieces of equipment and the correct knowledge.
This book contains the knowledge you will need to build and setup your own backyard gas making factory inside your own back garden. One that will create an endless amount of free biogas using nothing more than bacteria and food waste.
Whether you live in the city or the off grid, now you can help yourself and start to free yourself from the grip of the power companies by providing your own biogas free of charge.
Specifically written for the complete beginner with no knowledge of biogas and its production, this book will guide you towards building and maintaining your own backyard biodigester.

If you want to save money on your bills, help the environment, or live your life off-grid then this is your first step on the ladder to your new life.


 

 


Sunday, August 22, 2021

Digestate or slurry from biogas digester useful as organic plant fertilizer

From waste to useful effluent as organic plant fertilizer. I noticed my chilli plant starts flowering everytime I pour the effluent to the ground below it.

It is very obvious when effluent from biogas digester used onto chilli plant, its flowers bloom significantly thrn producing lot of chillies.






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How to feed a biogas digester to produce biogas

 To feed a biogas system we need to know how much to put into it. Because the system is a biological one and operated by bunch of methane microbes, we need to know the background temperature where you placed the digester to determine the volume they can consume within a period of time. Too much feeding will cause sourness shows unability of the microbes to cope (overfeeding). Methane microbes activity will only work in optimum within a narrow pH window like 6-8. So the amount of feed is very critical to maintain the system in a balance easily control by looking at pH. I am very lucky able to find temperature data at my place. The average is like 26.8 celcius. So, according to David David William House 's graph (look below), the approximate HRT* is 45 days. So, it is safer for me to decide to choose 50 days HRT for my digester. To determine how much to feed daily is by calculating = digester volume (liter) / HRT (day) = 200 liter/50 days = 4 liter/day. Again, rule of thumb do not get solid food waste over 50% of daily feeding volume. In my case for 4 liter feeding, 2 kg of food waste is the maximum volume then mix with 2 liter of water to a total of 4 liter. If you do not have confident and do not want to get your system sour lets try less than 50% food waste of your daily feeding volume. Please try and error, experiment with your system and you will learn a lot finding the most optimum condition to run your system.


HRT - hydraulic retention time


HRT indicates the number of days required for a given amount of digestion to occur at a specified temperature. The general idea is that the colder things are, the longer things take. Of course, it could therefore also represent the size of the digester needed for a given amount of daily feedstock, since that daily amount will have to stay in the digester an approximate number of days, the digester will be correspondingly larger as the average temperature drops.


Source of graph - DIY Home Biogas Digester: How to make biogas at home manual by David William House is worth to try (diybiogasgenerator.blogspot.com)

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