Purify your biogas using scrubbers.
Watch below:
How to calculate the sizing & volume (diameter & height) digester to be constructed
This is how Mark Aæ calculate the sizing & volume (diameter & height) to be constructed of floating and fixed type biogas for pigs, cattle & chicken
3 PRIME STAGES TO INITIATE BIOGAS
3 STAGES TO INITIATE BIOGAS:
1. Maturation of fresh cow dung starter
2. Acclimatization of matured starter to new waste
3. Optimization of feeding to obtain best ratio of waste to water, temperature and digester size for routine feeding
AT FIRST MY GAS IS BURNING BUT THEN STOP PRODUCING. WHY?
So, when the the first batch of biogas is produced, it showed that your dung starter is already matured and ready to produce next batch of biogas. But it is only the beginning. The number of microbes have already multiply several folds compare to fresh dung. Matured starter can produced biogas faster then fresh dung. However, you cannot jump to conclusion that you can add any waste in any amount. How would you push microbes from dung to suddenly adapt to digest waste from different sources? It is impossible! You have to start slowly introducing alien waste into this matured starter. So that these microbes could first learn to recognize then adapt to the new waste. Introduce the new different waste little by little until the sensitization process is complete. Introducing large amount of alien waste to a new digester will cause your starter became shock and stagnant. Give them time to learn. They are not machine but only living things like us. Have mercy ok.
WHY MY GAS IS NOT BURNING?
When I first initiate my digester with zero knowledge about biogas my favourite question was why is there no any gas produced? So you are very lucky if there is gas production by the new digester because carbon dioxide will come out first in the beginning before then methane. You have to understand that biogas is actually mix of several type of gas like carbon dioxide, methane and other inert gas. Along the process of biogas production, in the beginning of chain reaction, acidification will first occurr thus producing carbon dioxide. It is normal to have carbon dioxide in the very beginning. It is a positive sign that your digester is working well and will produce methane a bit later according to the chain reaction. Unless your digester is continuously producing carbon dioxide after months of starting then you have to start worry there might leakage somewhere along digester system.
Biogas Digester Simple Design
Hi,
Welcome to Biogas DIY,
AREN'T YOU STILL STRUGGLING DO NOT KNOW HOW TO BUILD SIMPLE DIGESTER?
Do not worry. I have provided you with a simple design suitable for beginner to understand.
To directly begin with simple basic small scale biogas digester design and its functions please click the link below.
Other information according to step (do not skip either step):
Small project for beginner:
Zero about biogas?
Biogas Bag for Storage
Storage using gas bag is easy. Choose bag size big enough for own use or otherwise you will suffer since every time its full then you have to burn or flare the biogas for cooking. A bag full of gas you may not want it to get full to maximum because if it full will prevent additional gas going into it. What happen next is the excess gas will push the slurry out of digester.
Vertical Biogas DIgester Design
Source: Joel Canaria
Observe a typical design of a digester.
Inlet - feeding occurs here having the largest diameter among all.
Gas outlet - biogas produced from the process goes out thru here connected to external storage.
Overflow - where slurry displaced by a new feeding goes out thru here.
Stirrer - to make sure agitation takes place. Optional for some practitioner.
Drain - to let the accumulated sediment to flow out thru to be discarded after operating for sometime.
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Horizontal Biogas Digester Design
I would like you to check out this design from a friend, more details please check under the QR code. Usually the blue tank converted as biodigester in a vertical form. This is quite different which someone could try on horizontically.
Source: Jørgen Rasmussen (A Clean New World)
Or for more explanation please refer to below video:
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Floating drum system for biogas storage
The system consist of two components:
1. The floating drum that has inlet and outlet for biogas. Inlet will let the biogas into the drum to be stored. Outlet is to let the biogas out when it is needed so should there be valve installed to control the process.
2. The base drum that contained water act as a platform for upper drum to float when there is gas produced. A steel guide installed to make sure the floating drum won't fall to the side.
So both drums are of different volume
a. floating drum is 160 liter
b. base drum is 200 liter
Biogas digestate as fertilizer
No mistake in deciding to pursue biogas generation. Food waste could be managed well environmentally friendly way. Also the byproducts could also useful for agriculture. After digestion the solid waste leftover could be turned into powder after drying and grinding. Inside its already contained beneficial microbes such able to fixing nitrogen in soil. Or its properties could be enhanced more via biotechnology application towards enrichment and value adding of the existing waste material.
Your effort will be worth it.
But be careful to
call your digestate as a biofertilizer make sure it contains beneficial
microorganisms (eg. Nitrogen fixing and/or phosphate solubilizing
and/or potassium solubilizing, etc) to enhance the properties of the
soil where you applied the digestate so that your plant grow better
compared to untreated soil. Another thing, biofertilizer should contain
enough no. of beneficial microorganism compared to background microflora
or otherwise won't show the expected effect if suppressed by other
dominant or large no. of other microbes inside the digestate.
fresh digestate
digestate in powder form after drying and grinding
source: Biogas DIY FB Group
Filtering biogas with water to reduce its carbon dioxide content
Filtering biogas with water may fulfill two needs:
- 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.
- Lower CO2 content in your kitchen when cooking inside own house mean healthier environment.
source: Biogas DIY FB Group
source: Biogas DIY FB Group
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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.
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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.
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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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.
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