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

Time	Narration
00:02	Hello everyone and welcome to this Spoken Tutorial on construction of the mixing tank.
00:12	This is an activity to be done on Day-2.
00:18	In this tutorial, we will learn the significance of the mixing tank and how to construct a mixing tank.
00:31	Let’s first understand the significance of the mixing tank and the shape of the mixing tank.
00:44	Mixing tank is where biomass is mixed with water and passed into the digester tank.
00:55	The mixing tank is usually cylindrical in shape.
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.
01:22	However, dry manure should never be put into this tank.
01:29	Manure should always be mixed in equal quantity of water.
01:37	For example, 25 kgs of manure should be mixed in 25 liters of water.
01:50	This will ensure free flow of the biomass into the digester tank.
01:59	Let’s see the construction of the mixing tank.
02:05	For construction, following items are used-
02:12	Weldmesh sheet of thickness 16 gauge,
02:18	some newspaper,
02:21	sand,
02:23	cement,
02:25	and liquid waterproofing material.
02:31	The step-by-step procedure to construct the mixing tank is as follows-
02:41	Spread the Weldmesh sheet of 69 inches x 24 inches on the ground.
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.
03:08	Now tie the loose ends, end to end, with steel wire.
03:17	We need to make a cylinder like structure with diameter 22 inches and height 24 inches.
03:31	Note that the hole has to be at the base of the mixing tank.
03:40	Now, place newspaper or any other paper inside the structure.
03:50	The paper will help hold the sand that will be filled inside this structure.
03:59	Pour sand up till the brim of the structure. This will give firmness to the mesh while plastering the outer wall.
04:14	Now, we will plaster the outer wall of the mixing tank.
04:23	Prepare cement mixture as follows-
04:30	sand- 75 kgs,
04:34	cement-25 kgs,
04:40	liquid waterproofing material - 50 ml, thoroughly stirred in 10 litres of water
04:51	and adequate water to mix this mixture well. Note that no gravel is used in this mixture.
05:05	Start plastering the outside wall of the mixing tank as shown here.
05:14	Finally, smoothen the plastering using a wooden trowel.
05:22	The mixing tank should be left overnight for curing.
05:29	Next day, take out all the sand placed inside the mixing tank.
05:38	This must be done carefully so as to not break the plastered outer wall of the mixing tank.
05:51	Once the sand is taken out, plaster the inside wall of the mixing tank.
06:02	Prepare fresh cement mixture as was prepared for outer wall of the mixing tank.
06:13	Spread half inch of this mixture on the inside wall.
06:21	While plastering, please remember the position of the hole that is at the base.
06:30	We need to break the plaster from here, later.
06:37	Let the plaster on the inside wall dry for 6-7 hours.
06:48	After 6 to 7 hours, remove the plaster at the position of the hole by slightly tapping it.
07:00	At this point, the mixing tank is ready to be transferred to the actual plant site.
07:12	Remember, the following has to be completed on the same day i.e day-2 of civil work. Hence, the mason has to plan accordingly.
07:30	This brings us to the end of this tutorial.
07:35	Assembly of the mixing tank for the biogas plant will be explained in a later tutorial.
07:45	Let’s Summarize. In this tutorial, we learnt the significance of the mixing tank
07:56	and how to construct a mixing tank.
08:01	This video was created by Spoken Tutorial project along with inputs from Rural-ICT Project, IIT Bombay.
08:15	More information on these projects is available at these given links.
08:23	This is Bella Tony along with the animation team from Spoken Tutorial Project, IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14