View source for Biogas-Plant/C3/Construction-of-the-Mixing-tank/English-timed


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| '''Time'''
| '''Narration'''

|-
| 00:02
|Hello everyone and welcome to this '''Spoken Tutorial''' on '''construction of the mixing tank'''.

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| 00:12
| This is an activity to be done on Day 2.

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| 00:18
| In this tutorial, we will learn the significance of the mixing tank and how to construct a mixing tank.

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| 00:31
| Let’s first understand the significance of the mixing tank and shape of the mixing tank.

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| 00:44
| Mixing tank is where biomass is mixed with water and passed into the '''digester tank'''.

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| 00:55
| The mixing tank is usually cylindrical in shape.

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| 01:02
| A mixing tank of height 2 feet and diameter 22 inches has the capacity to hold 25 kgs of manure mixed in water. 

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| 01:22
| However, dry manure should never be put into this tank.

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|01:29
|Manure should always be mixed in equal quantity of water. 

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| 01:37
| For example, 25 kgs of manure should be mixed in 25 liters of water.

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|01:50
|This will ensure free flow of the biomass into the digester tank.

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| 01:59
| Let’s see the construction of the mixing tank.

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| 02:05
| For construction, following items are used-

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| 02:12
| Weldmesh sheet of thickness 16 gauge, 

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| 02:18
|  some newspaper, 

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| 02:21
|  sand,

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| 02:23
| cement,

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| 02:25
| and liquid waterproofing material. 

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| 02:31
| The step-by-step procedure to construct mixing tank is as follows-

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| 02:41
| Spread the Weldmesh sheet of 69 inches x 24 inches on the ground.

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| 02:52
| Next, at a distance of 34 inches from one end of the sheet, make a hole of size 4 inch diameter with a metal cutting scissor.

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| 03:08
| Now tie the loose ends, end to end with steel wire.

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| 03:17
| We need to make a cylinder like structure with diameter 22 inches and height 24 inches.

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| 03:31
| Note that the hole has to be at the base of the mixing tank.

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| 03:40
| Now, place newspaper or any other paper inside the structure.

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| 03:50
| The paper will help hold the sand that will be filled inside this structure.

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| 03:59
|Pour sand up till the brim of the structure. This will give firmness to the mesh while plastering the outer wall.

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| 04:14
| Now, we will plaster the outer wall of the mixing tank.

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| 04:23
| Prepare cement mixture as follows-

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| 04:30
| sand- 75 kgs,

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| 04:34
| cement-25 kgs,

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| 04:40
| liquid waterproofing material - 50 ml thoroughly stirred in 10 litres of water

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| 04:51
|  and adequate water to mix this mixture well. Note that no gravel is used in this mixture.

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| 05:05
| Start plastering the outside wall of the mixing tank as shown here.

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| 05:14
| Finally, smoothen the plastering using a wooden trowel.

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| 05:22
| The mixing tank should be left overnight for curing.

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| 05:29
| Next day, take out all the sand placed inside the mixing tank.

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| 05:38
| This must be done carefully so as not to break the plastered outer wall of the mixing tank.

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| 05:51
| Once the sand is taken out, plaster the inside wall of the mixing tank.

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|06:02
|Prepare fresh cement mixture as was prepared for outer wall of the mixing tank.

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|06:13
|Spread half inch of this mixture on the inside wall. 

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| 06:21
| While plastering, please remember the position of the hole that is at the base.

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|06:30
|We need to break the plaster from here, later.

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| 06:37
| Let the plaster on the inside wall dry for 6-7 hours.

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| 06:48
| After 6 to 7 hours, remove the plaster at the position of the hole by slightly tapping it.

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| 07:00
| At this point the mixing tank is ready to be transferred to the actual plant site.

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| 07:12
|Remember -the following has to be completed on same day i.e day 2 of civil work. Hence, the mason has to plan accordingly.

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| 07:30
| This brings us to the end of this tutorial.

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|07:35
|Assembly of the mixing tank for the biogas plant will be explained in a later tutorial.

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|07:45
| Let’s Summarize. In this tutorial, we learnt- significance of the mixing tank

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| 07:56
| and how to construct a mixing tank.

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|08:01
|This video was created by '''Spoken Tutorial''' project along with inputs from '''Rural-ICT Project, IIT Bombay'''.

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| 08:15
| More information on this mission is available at this given link.

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|08:23
| This is Bella Tony along with the animation team from '''Spoken Tutorial Project, IIT Bombay''', signing off.

Thank you for joining.

|}