₦airaland Forum

Training Ends today.

Carmal90:
Keenly following, all my question will come after the trainings

Liquefaction is extremely expensive. But yes, biogas can be liquefied. Other questions has been answered in my previous posts.

prettyboi1989:
bro, i like wat u doing here, is it possible to liquefy biogas? n if so can it be used with normal kerosene stoves or it will av its own kind of stove.

You can get your biogas stove locally

Afoskalex:
Where can one get it?

Its a pleasure man

confluence:
@DEXPRO WELL DONE MASTER

I know nothing about refrigerator modification using biogas, But biogas generators are readily available in Nigeria without any need for modification.

Afoskalex:
Dexpro, is the biogas stove readily available in Nigeria or do u order for them. Can it be locally fabricated. The other question I asked the other time as not been answered on the modification of refrigerator and generator for biogas. Thanks Sire

Attach Gas Pipe to Stove

In an earlier step, we prepared three sets of gas pipes to be used with the biogas plant. The first set of pipe is being fixed with the outlet from the gas holder tank. The second set will be used to link the gas line from the gas holder to gas pipe fixed with the stove. Here we use the third set of gas pipe to be fixed with the stove.

Attach the free end of gas pipe to the stove. I have also used a layer of insulation tape to seal the joint from any leakage.

The other end with the crimped attachment will connect to the gas link pipe.

Now our biogas stove is ready for testing.

More pictures of my stove

DAY TEN

Biogas Stove

To use the biogas for cooking, you need a stove specially made for biogas. I got a new twin-burner biogas stove from the market after an exhaustive search. Normally, LPG is used at home, so there is no demand for biogas stoves and shops do not stock them.

If you look at the picture of the biogas burner, you can see that the holes are larger than that used in LPG stoves. The nozzle of the burner also has a larger orifice. The biogas stove is designed in such a way that methane is mixed with double the quantity of air before being burned.

The specifications on the sticker says the pressure required is 747 N/m2, that is 747 Newtons per Square meter, converted to 7.62 gf/cm2 (gram-force per square centimeter). Each burner consumes about 450 liters of gas per hour *if fully opened. That means with a 500 liter gas holder tank filled with gas, I can use it for about an hour in one burner.

N.B My biogas stove has three switch level, LOW, MID & HIGH. You can only set your stove to HIGH only if you have a social event. A 500L full gas plant will provide energy for a household of 4 for two days nonstop , though you can't put on your stove for two days without putting it off or can you?

Guys feel free to ask as many questions as regards BIOGAS. I will gladly reply
Email: biogasindex@gmail.com

confluence:
thanks Boss waiting to learn from the master himself

Visit your local market and ask for biogas stove. Note that price varies.

intbizoil:
how much is it sold and where can I order it

I have been using biogas for the past four years and have successfully bottled it for sale.

confluence:
hello Dexpro, how far? am enjoying this class , just wandering how sustainable this our project will be when finally completed, can one totally switch to biogas?

Burners like this ones are sold in the market

Afoskalex:
Op, how do one construct the burner for biogas? I hope you will teach us that aspect and the modification of generator and refrigerator to use biogas.

[size=15pt]A Word of Caution: NEVER TRY THIS!!![/size]

Real Story... One student who got guidance from me over telephone, constructed a mini biogas plant for school exhibition and was over enthusiastic... She opened the gas valve from the gas holder and tested whether the gas burns or not by holding a burning match stick in front of the gas pipe. The entire gas tank exploded. Fortunately, nobody was injured but they had to spend lot of time to clean up the mess.

Never do this... only use a Biogas stove or a Bunsen burner or a suitable nozzle arrangement to test the gas.

More

A Vented Ram for Pushing down Larger Chunks and Agitating the Slurry

After feeding kitchen waste through the feed pipe, you may find some larger chunks floating inside the feed pipe. I have made a small vented ram using some scrap material and a one meter long 32 mm pipe. This ram can be used inside the feeding pipe to push down the chunks down. The vents in the ram will allow the water to seep through, thus making it easier to operate inside the feed pipe.

Repeated up and down movements of the ram inside the feed pipe not only help in pushing down the larger chunks, it will also help in agitating the slurry inside the digester and help in releasing trapped gas. This will also break down the scum formed on the surface of the slurry and accelerate the digestion process.

Wash the ram with clean water after every use.

DAY NINE

How Much to Feed...?

Once gas formation starts, you can start feeding the digester regularly with wastes from kitchen and home garden. But the big question is How much waste we can feed ?

Here, the capacity of my digester is 750 liters. So I will feed about 3500 to 4000 grams of waste in this plant daily.

Why this much quantity only ?

All solid wastes we feed into the digester will take between 30 to 50 days to get fully digested based on the type of waste. For example, cow dung will take about 30 days for full digestion and solid vegetable wastes may take 50 days. This is known as Retention Time.

By adding the wastes in small quantities everyday, I will have a regular supply of about 750 grams of gas after about 30 days. This will assist the wastes to get fully digested and release optimum gas and get discharged through the slurry outlet pipe. Overfeeding the digester will drain out the partially digested wastes, which will increase acidity of the slurry in the digester as well decrease the colony of microorganisms working on the wastes.

As a thumb rule, for 1000 liter capacity digester, feed approximately about 5000 grams of waste.

Also, the solid wastes should be made into chunks as small as possible. Here, you can see in the photographs above that I have used an old mixer grinder to pulverize the larger chunks of vegetable waste.

Sure you will

confluence:
@DEXPRO,
Class to commence soon ,in this era of subsidy removal and serious economic crunch, i need all the details to construct my own Bio gas plant

Afoskalex:
Op, I happened to stumble on ur thread today and I will say you the master,no flaterry. My question is that will salt in spoilt food not affect the production of gas? I was told that omi ogi(the water gotten from pap preparation) can be used as a catalyst, how truei is that?

Fenkx for the compliments. Too much salt may affect but not the small quantity added to the food we eat.

Yes the water gotten from pap can be used as a catalyst

BEAUTIFUL QUESTION. The sides you pointed to were not sealed. Now this is the logic: The GAS HOLDER TANK is actually sitting on the content inside the digester, the weight of the gas holder tank will make it sink like some inches into the mixed dung. N.B The upper part of the gas holder tank will contain air thereby making it float. The outer ring outside the gas holder tank is not relevant.

ewizard1:
Good work sir @Dexpro I guess questions were not coming because there wasnt any unclear detail about the whole process.
.
But one question i would like to ask is this; since the Gas Holder was turned on the Digester, isnt there any escaped gaps on the side (Where arrows point at) where the gases can leak out from? Or did you seal it round?
.
I hope the attached picture clearly explains what i am saying.

akinz4:
How would you remove the Impurities present in the Gas?
I am also quoting you from the above "Moreover, there was air present in the gas tank when we placed it over the digester.
Once the gas tank is full, this gas will be released to the atmosphere’’
How would you remove the Impurities present in the Gas?
According to your above quotations: How would you utilize the Gas once it is released to the Atmosphere? Please respond as fast as you can.


Gas formation will start after about two days of feeding the digester with cow dung slurry. You can see here in these photographs that the gas holder tank started raising along the guide pipes.

But, this gas contains lot of impurities and will not burn. Moreover, there was air present in the gas tank when we placed it over the digester.

Once the gas tank is full, this gas will be released to the atmosphere.

The first gas generated by your plant will contain a lot of impurities. When i say release the gas to the atmosphere, it means the impurities in the gas will not make it burn, so what will you do with it? Nothing. Then the best option is to release the ¨USELESS¨ gas out of the gas tank. Hope you understand?


Biogas can be purified using a special device. We'll get to that aspect soon.

At this stage, i expect constructive questions but it seems non is coming.

You have been the only person that have actively contributed to this thread, Well Done.

confluence:
@DEXPRO,
Well done sir, more grease to your elbow

Yes Sir

BluePearls:
nice one man..lesson continues tomorrow right?

Do have yourselves a wonderful night rest.

Materials unfit for Biogas Digester

Avoid the following type of materials in a Biogas plant

Dry skins of Onion and Garlic
Egg shells
Fibrous materials like coconut husk
Bones, raw or cooked

PICTURES

The last set of picture

Even more

More pictures

Type of Material which can be used for Feeding the Biogas Plant

Once the gas formation starts, you can feed waste material to the digester. The following are some of the wastes commonly available in a household

Rotten vegetables
Vegetable peels
Fruit skins
Left-over spoiled food which are unfit for consumption
Very sour curd unfit for consumption
Left-over vegetable oil used for frying
Grass and weed clippings
Dried flowers
Tender banana stems
Cattle waste like cow dung, goat dung and poultry waste
Leftovers coffee grounds and leftover tea leaves
Water used for rinsing rice and pulses. You can use this water for diluting the feed material

This list is endless... there are so many organic waste material you can use in the anaerobic digester. Make sure you chop them into pieces as small as possible. However, avoid certain items given in the next lesson which are unfit for feeding the biogas plant.

***Remember, food is precious. Do not waste food. Use only spoiled food which is unfit for consumption

DAY EIGHT

Gas Formation

Gas formation will start after about two days of feeding the digester with cow dung slurry. You can see here in these photographs that the gas holder tank started raising along the guide pipes.

But, this gas contains lot of impurities and will not burn. Moreover, there was air present in the gas tank when we placed it over the digester.

Once the gas tank is full, this gas will be released to the atmosphere.

Yes. Let us begin

confluence:
@Dexpro,
Good afternoon sir, am hanging around the class room for class to begin.

Class will begin soon