Biogas-Plant/C3/Assembly-of-the-Biogas-plant/English-timed

Time	Narration
00:01	Hello everyone and welcome to this Spoken Tutorial on Assembly of the Biogas plant.
00:10	In this tutorial, we will learn how to assemble the following-
00:16	digester tank with the dome,
00:18	mixing tank and
00:21	slurry tank.
00:23	Please note that this is an activity of day-3.
00:30	Let us start.
00:32	Transfer the chicken mesh dome to the actual plant site.
00:38	Place the dome on the raised wall of the digester tank.
00:43	Once this is done, fix the main gas pipe of 1 inch diameter on the top of the dome.
00:53	To do this, hold the pipe with the external thread on the top.
01:00	Insert the pipe between the holes of the 3 chicken layer(s) and rotate slightly.
01:10	Check if it is firmly placed.
01:13	The pipe will be fixed permanently in this position when the outer wall of the dome will be plastered.
01:24	Remember: the external thread on the gas pipe will help fit the hose pipe firmly.
01:33	Notice the external thread at the top of the gas pipe.
01:38	An important thing to be done next is the following-
01:44	On the side of the dome, adjacent to where the mixing tank will be placed,
01:51	make a firm base. This base should be 4 feet and 5 inches higher than the dome for placing the mixing tank.
02:06	Next, on the side of the dome facing the base of the mixing tank, cut chicken mesh.
02:16	Use a scissor to cut the mesh and make a hole of 6 inches diameter.
02:27	Through this hole, one end of the inlet pipe will be inserted at an angle of 45 degrees.
02:38	Rest the other end of the inlet pipe at the base of the mixing tank and plaster it with cement mixture.
02:52	Bio-waste will reach the digester tank through this inlet pipe.
03:00	This is how the inlet pipe will look like from inside the dome.
03:09	Once the gas pipe is fitted, we need to plaster the dome from outside.
03:18	An interesting fact is that the dome is plastered twice and both coats of plaster have different ratio of sand and cement.
03:35	For first coat of plastering, use the following-
03:42	sand- 200 kgs,
03:45	cement- 100 kgs,
03:50	liquid waterproofing material- 150 ml, thoroughly mixed in 20 liters of water and adequate amount of water.
04:04	What you see here is the mason using the first coat of plaster on the dome.
04:13	Before entirely plastering the outer wall of the dome, the base of the digester tank has to be plastered for the second time.
04:27	Ratio of cement mixture to be used is-
04:33	sand -90 kgs,
04:37	cement -50 kgs,
04:42	liquid waterproofing material- 100 ml, mixed in 15 litres of water and
04:53	adequate amount of water as mentioned earlier.
05:00	What you see here is the mason adding liquid waterproofing material to the cement mixture.
05:11	Remember - the thickness of the layer of the plaster should be about 3 inches only.
05:22	Next comes the attaching of the walls of the slurry tank with the dome.
05:30	Hole of the slurry tank has to be 6 inches lower than the dome.
05:38	This will ensure free flow of slurry into the slurry tank.
05:47	Place the slanting wall(s) of the slurry tank at either sides of the entrance to the dome.
05:58	With the hook, interlock the excess chicken mesh at the base of the dome and at the edge of the slurry tank wall.
06:12	Carefully tighten the chicken mesh securely so as to join the walls to the dome.
06:23	To seal the joints, use cement mixture with adequate amount of water.
06:34	Apply this mixture carefully so that there are no gaps at all.
06:44	Please note that at this point, we have used 3 of the 7 walls for the slurry tank.
06:57	The plastered dome should now be left for 6-8 hours for curing.
07:06	Leaving the dome for curing, we will now attach the mixing tank.
07:15	As mentioned earlier, mixing tank will be placed 4 feet and 5 inches higher than the dome to avoid water logging.
07:29	The mixing tank is connected to the digester tank via the inlet pipe.
07:37	Before placing, check the hole at the base of the mixing tank.
07:44	The hole should be placed just in front of the inlet pipe of 6 inches diameter.
07:52	Remember - this inlet pipe of 6 inches diameter has been already inserted inside the dome at an angle of 45 degrees.
08:08	For the hole of the mixing tank and the inlet pipe to be in line with each other, do the following-
08:20	place three bricks around these two and plaster it with cement.
08:29	After plastering, leave it for curing overnight.
08:35	This is how it will look in a functional biogas plant.
08:43	Now, plaster the entire outer dome wall for the second time and the inner wall of the dome as well.
08:57	Prepare the cement mixture as follows-
09:03	sand- 180 kgs,
09:06	cement- 100 kgs,
09:11	liquid waterproofing material 250 ml, mixed in 20 liters of water
09:21	and adequate amount of water.
09:26	Spread this mixture evenly on the outer wall of the dome
09:33	and on the inner wall of the dome as well.
09:39	Smoothen out the plaster by using the wooden trowel.
09:46	Leave the whole structure for curing for 17 days.
09:54	This brings us to the end of day-3.
10:00	On day-4, we will do the following-
10:06	Dig two rectangular pits adjacent to the side walls of the lower tank.
10:15	The dimensions would be 1 foot and 5 inches of length, 1 foot and 5 inches of width and 2 feet of height.
10:32	Dig another pit at the front of the lower tank as shown here.
10:41	The dimensions would be- 10 inches of length, 28 inches of width and 2 feet of height.
10:58	Lay foundation on both the adjacent sides and the front side of the lower tank using gravel, cement and sand mixture.
11:18	The gravel, sand and cement is mixed in the same proportion as mentioned previously.
11:30	Now, join the four walls of the upper slurry tank.
11:37	Plaster the edges of the walls with cement.
11:45	The wall with the hole should face the fields. This will help the slurry to flow out smoothly through the hole.
11:59	Coming back to the dome, place approximately 25 jute gunny bags on the dome.
12:11	Twice a day, start spraying water on the dome.
12:18	Spray as much is required to wet the outer wall of the dome.
12:26	Jute bags placed on the outer wall help to retain the water.
12:35	This will keep the dome wet for longer hours.
12:43	Lastly, the entire dome should be covered with the plastic sheet held between 2 - 4 pillars.
12:56	This plastic sheet will protect the dome from too much sunlight, thereby avoiding too much drying of the dome.
13:11	This brings us to the end of day-4.
13:17	On the 15th day of curing-
13:22	make a mixture of 2 litres of water,
13:29	250 gms of Synthetic Resin Adhesive and 2kgs of white cement.
13:41	Apply this mixture on the inside of the digester tank to seal crack(s), if any.
13:52	At this point, the civil work of the biogas plant is completed.
14:00	We will now learn to connect the main gas pipe to the kitchen.
14:07	Connect the main gas pipe from the digester tank to the main gas control valve, as shown here.
14:22	The joint between the main gas pipe and gas control valve should be perfectly air-tight.
14:35	Otherwise, gas leakage from this joint cannot be stopped easily.
14:46	From the main gas control valve, we have to connect a gas conveyor pipe.
14:57	Once again, connect these using a straight joint and ensure it is air-tight.
15:11	The gas conveyor pipe extends all the way to the kitchen.
15:20	Inside the kitchen, connect the safety valve to the gas conveyor pipe using a straight joint.
15:33	Connect another straight joint on the other end of the safety valve.
15:43	Make sure that all the joints are air-tight.
15:50	Lastly, connect the rubber hose to the stove.
15:58	After all the connections are made, the biogas plant is ready for use.
16:09	After 17 days of total curing time, raw materials can be put into the biogas plant.
16:23	Initial production of biogas will take about 6 days.
16:31	After that, it will be a regular daily production.
16:38	Now, to check whether biogas has been produced, do the following.
16:48	Ensure that both the safety valves are in open position for the gas to be conveyed.
17:00	Light the burner and check the flame for production of the biogas.
17:10	Another issue is water condensation. So, how can water condensation be avoided?
17:23	The gas conveyor pipe from the dome towards the kitchen should be always in an upward direction.
17:35	If so, water accumulation inside the conveyor pipe is negligible.
17:44	This brings us to the end of this tutorial.
17:50	Let us Summarize.
17:54	In this tutorial, we learnt how to assemble the following.
18:02	Digester tank with the dome
18:06	mixing tank and
18:09	the slurry tank.
18:13	This video was created by Spoken Tutorial Project with inputs from Rural-ICT Project, IIT Bombay.
18:25	More information on these projects can be found at these links.
18:33	This is Bella Tony along with the animation team of Spoken Tutorial Project, IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14