Difference between revisions of "Biogas-Plant/C3/Assembly-of-the-Biogas-plant/English"

Assembly of the Biogas plant.

Welcome to this Spoken Tutorial on Assembly of the Biogas plant.

Learning Objectives

We will learn how to assemble-

• Digester tank with the dome
• Mixing tank and
• Slurry tank

[[Image:]]

We will learn how to assemble the following:

• Digester tank with the dome
• Mixing tank and
• Slurry tank

Please note that this is an activity of Day 3.

Transfer the chicken mesh dome to the actual plant site.

Place the dome on the raised wall of the digester tank.

[[Image:]]

[[Image:]]

Once this is done, fix the main gas pipe of 1 inch diameter, on the top of the dome.

To do this-

1. hold the pipe with the external thread on the top.

2. insert the pipes between the holes of the 3 chicken layers and rotate slightly.

3. check if it is firmly placed.

The pipe will be fixed permanently in this position-

• when the outer wall of the dome will be plastered.

Remember: the external thread on the gas pipe, will help fit the hose pipe firmly.

Show arrow at the external thread

An important thing to be done, next, is the following-

[[Image:]]

Arrow at the inlet pipe and the base to keep mixing tank

On the side of the dome adjacent to where the mixing tank will be placed, make a firm base.

This base should be 4 feet and 5 inches higher than the dome for placing the mixing tank.

Next, on the side of the dome facing the base of the mixing tank, cut chicken mesh.

Use a scissor to cut the mesh and make hole of 6 inch diameter.

Through this hole-

• one end of the inlet pipe will be inserted
• at an angle of 45 degrees.

Rest the other end of the inlet pipe-

• at the base of the mixing tank and
• plaster it with cement mixture.

Bio-waste will reach the digester tank through this inlet pipe.

Bio-waste will reach the digester tank through this inlet pipe.

Encircle the inlet pipe

This is how the inlet pipe will look like from inside the dome.

Once the gas pipe is fitted :

• Plaster the dome from outside

Once the gas pipe is fitted, we need to plaster the dome from outside.

An interesting fact -

• The dome is plastered twice
• Both coats of plaster have different ratio of sand and cement.

• The dome is plastered twice and

• both coats of plaster have different ratio of sand and cement.

[[Image:]][[Image:]]

• Sand- 200 kgs
• Cement- 100 kgs
• Liquid waterproofing material- 150 ml thoroughly mixed in 20 Ltrs of water
• Adequate amount of water

Before entirely plastering the outer wall of the dome do the following

Ratio of cement mixture to be used is-

[[Image:]]

• Sand-90 kgs
• Cement-50 kgs
• Liquid waterproofing material- 100 ml mixed in 15 Ltrs of water
• Adequate amount of water as mentioned earlier.

What you see here, is-

• The mason adding Liquid waterproofing material to the cement mixture.

The thickness of the layer of the plaster should be about 3 inches only.

Show pictorial (graphic) image

Next comes the attaching of the walls of the slurry tank with the dome.

• Hole of the slurry tank has to be 6 inches lower than the dome.

• This will ensure free flow of slurry into the slurry tank.

Animation for interlocking

Place the slanting wall(s) of the slurry tank at either sides of the entrance to the dome.

With the hook, interlock the excess chicken mesh -

1. at the base of the dome and
2. at the edge of the slurry tank wall

Carefully-

• tighten the chicken mesh securely, so as to join the walls to the dome.

To seal the joints, use cement mixture with adequate amount of water.

[[Image:]]

Apply this mixture carefully, so that there are no gaps at all.

Please note that at this point-

• we have used three of the 7 walls for the slurry tank.

As mentioned earlier-

• mixing tank will be placed 4 feet and 5 inches higher than the dome

• to avoid water logging.

Show arrow at the hole

[[Image:]]

The mixing tank is connected to the digester tank via the Inlet pipe.

• Before placing, check the hole at the base of the mixing tank.

• The hole should be placed just in front of the inlet pipe of 6 inch diameter.

Remember -

This inlet pipe of 6 inch diameter

• has been already inserted inside the dome
• at an angle of 45 degrees.

For the hole of the mixing tank and the inlet pipe to be in-line with each other, do the following:

[[Image:]]

• Place three bricks around these two and plaster it with cement.

• After plastering, leave it for curing overnight.

• This is how, it will look in a functional Biogas plant

• Plaster the outer wall of the dome for second time and

• Inner wall of the dome as well.

Now, plaster the entire outer dome wall for the second time.

And the inner wall of the dome as well.

• Sand- 180 kgs
• Cement- 100 kgs
• Liquid waterproofing material- 250 ml mixed in 20 Ltrs of water
• Adequate amount of water

Spread this mixture evenly on the outer wall of the dome.

And on the inner wall of the dome, as well.

[[Image:]]

Smoothen out the plaster by using the wooden trowel.

Leave the whole structure for curing for 17 days.

[[Image:]]

1. Dig two rectangular pits adjacent to the side walls of the lower tank.

2. The dimensions would be-

• 1 foot 5 inches of length, 1 foot and 5 inches of width and 2 feet of height.

3. Dig another pit at the front of the lower tank as shown in the image.

4. The dimensions would be-

• 10 inch of length, 28 inches of width and 2 feet of height.

5. Lay foundation-

• on both the adjacent sides
• and the front side of the lower tank
• usinggravel, cement and sand mixture.

6. The gravel, sand and cement is mixed-

• in the same proportion as mentioned previously.

7. Now, join the four walls of the upper slurry tank.

8. Plaster the edges of the walls with cement.

9. The wall with the hole should face the fields.

10. This will help the slurry to flow out smoothly through the hole.

Coming back to the dome-

• Place approximately 25 jute gunny bags on the dome.

• Twice a day, start spraying water on the dome.

• Spray as much as required to wet the outer wall of the dome.

• Jute bags placed on the outer wall help to retain the water.

• This will keep the dome wet for longer hours.

• Spray as much as required to wet the outer wall of the dome.

• Jute bags placed on the outer wall help to retain the water.

• This will keep the dome wet for longer hours.

Lastly, the entire dome should be covered-

• with a plastic sheet held between 2- 4 pillars.

• Plastic sheet will protect the dome from too much sunlight

• This plastic sheet will protect the dome from too much sunlight

• Thereby avoiding too much drying of the dome

• 2 Ltrs of water,
• 250 gms of Synthetic Resin Adhesive and
• 2kgs of white cement

Apply this mixture on the inside of the digester tank, to seal cracks, if any.

We will now learn to connect the main gas pipe to the kitchen.

• from the digester tank to the main gas control valve, as shown here.

The joint between-

• the main gas pipe and gas control valve should be perfectly air-tight.

Otherwise, gas leakage from this joint cannot be stopped easily.

The joint between the main gas and gas control valve should be perfectly air-tight

• connect the safety valve to the gas conveyer pipe using a straight joint.

• connect another straight joint on the other end of the safety valve.

Then connect the rubber hose pipe to the other end of the water outlet pipe.

Make sure that all the joints are air-tight.

After all the connections are made, the Biogas plant is ready for use.

• raw material can be put into the Biogas plant.

Create a background image by merging both the images given below.

Initial production of Biogas will take about 6 days.

After that, it will be a regular daily production.

• Ensure that both the safety valves are in open position, for the gas to be conveyed.

• Light the burner and check the flame for production of the Biogas.

How to avoid water condensation?

Another issue is water condensation.

So, how can water condensation be avoided?

The pipe from the dome towards the kitchen has to be shown in red

The gas conveyer pipe from the dome towards the kitchen should be-

• always in an upward direction.

If so, water accumulation inside the conveyer pipe is negligible.

This brings us to the end of this tutorial

Summary

In this tutorial, we learnt, how to assemble the following-

• Digester tank with the dome
• Mixing tank and
• Slurry tank

Let’s Summarize-

In this tutorial, we learnt,

How to assemble the following-

• Digester tank with the dome
• Mixing tank and
• Slurry tank

Acknowledgements

This video was created by:

Spoken Tutorial Project with inputs from Rural-ICT team, IIT Bombay.

Spoken Tutorial Project with inputs from Rural-ICT team, IIT Bombay.

http://spoken-tutorial.org/NMEICT-Intro

http://ruralict.cse.iitb.ac.in/ in

http://spoken-tutorial.org/NMEICT-Intro

http://ruralict.cse.iitb.ac.in/ in

Pictures and technology support:

Courtesy:

Bhagirath Rural Development Foundation

Village- Zarap, Taluka- Kudal,

Dist.- Sindhudurg

Pictures and technology support:

Courtesy:

Bhagirath Rural Development Foundation

Village- Zarap, Taluka- Kudal,

Dist.- Sindhudurg

Thank you for joining.