What is biogas?

Biogas is a by-product generated during the decomposition of any kind of organic matter by means of anaerobic bacteria.

Biogas is mostly of 50-75% methane, 25-40% CO2 and other traces of moisture, H2S, Nitrogen, Oxygen & Hydrogen.

Biogas is a clean and renewable energy source which substitutes LPG and CNG for cooking, steam generation, transportation fuel, electricity generation, etc.,

At room pressure and temperature biogas is in gaseous form, not liquid like LPG (propane).

What type of waste produces biogas?

Biogas can be produced by the decomposition of any kind of organic waste. Few examples are as mentioned below.

1. Kitchen Waste like food waste, Fruit and Vegetable waste, etc.,

2. Farm manure like Cow dung, Poultry litter, Horse dung, Pig manure, etc.

3. Industrial Waste like Food processing industrial waste, Meat packing waste, Fish packaging industry waste, Dairy industry waste, Tapioca industrial waste, Sugar factory wastes like Press Mud, Bagasse wash water & Molasses, Brewery & Distillery waste, etc.

4. Agricultural Waste like Green Grass, Corn Waste, Harvest residues, Whole crop fodder, etc.,

How much biogas can I get out of my kitchen waste?

The amount of biogas you can extract from your organic waste depends on the quantity of waste. Around 6-10 kg of food & vegetable waste can generate 1 m3 of biogas.

Can I feed my kitchen waste directly in to the bio digester?

Yes. You can directly feed the kitchen waste in to the biodigester through the inlet pipe. Make sure that the particle is smaller in size so that it should easily pass through the inlet pipe into digester.

How much biogas can I get out of my cow’s dung?

1 m3 of biogas can be generated from 20-25 kg of cow dung.

How long will 1m3 biogas plant burns equivalent to LPG?

1 m3 of biogas is equivalent to 0.5 kg of LPG which will continuously burn in a single biogas burner for around 2 hrs.

1m3 biogas plant replaces 1 domestic LPG cylinder per month.

What happens to the waste after digestion?

After Digestion, the compost will come out of the digester through the Outlet pipe automatically.

Despite popular belief that the amount of waste going in the digester is almost equal to the amount coming out, the quality of the waste is altered for the better (less odour, better fertilizer, organic load reduced, less polluting).

How can the compost be used effectively?

Waste coming out of the digester can be directly used as organic fertilizer (after mixing with water in the ratio of 1:10) in Gardens & Farms.

What happens if I am not using the generated biogas as I am out of station for a long period?

The generated biogas will be stored in the gas holder fitted along with the bio digester. As you are outstation you will not feed it & so, no more excess gas will be produced.

What will happen, if I am feeding the digester continuously without using the Gas?

The gas generated will get stored in the Gas holder and the excess gas generated will escape out through the water jacket portion of the biogas plant easily.

Is there any chance of Explosion, if the Biogas leaks?

Not at all. The Biogas is highly safer than LPG. Density of LPG is heavier than air. When LPG is leaked, it flows for long distances along the ground (Downward direction), and can collect in drains, gullies and cellars which causes explosion.
Unlike LPG, the density of biogas is lighter than air. When Leaked, biogas moves in the upward direction in air and easily mixes in the atmosphere.

What about Maintenance & Service for domestic biogas plant?

We give one year free service & Warranty. Annual Maintenance Contract (AMC) will be provided after one year and the cost of AMC varies from Rs. 1500 to Rs. 4000 based on the capacity.

What is the space required for biogas plant?

The space required for various capacities is as mentioned below.

» 0.5m3 – 3 x 4 ft
» 1m3 – 4 x 5 ft
» 2m3 – 5 x 6 ft
» 4m3 – 7 x 7 ft
» 5m3 – 8 x 8 ft
» 6m3 – 9 x 9 ft

What is B-Sustain’s scope of supply for Domestic Biogas Plant?

» Water seal digester
» Gas holder
» Inlet pipe (PVC)
» Inlet box with cover
» Outlet pipe with elbow (PVC)
» Gas outlet pipe with Ball Valve & brass nipple
» Biogas single burner
» Complete free service warranty for one year

Will there be any odour from biogas plant?

No. There won’t be any odour as we offer only water seal model biogas plant.

What Type & Make --- B-Sustain Biogas Plant is?

Type: Readymade & Floating drum

Make: Fibreglass Reinforced Plastic (FRP) whose lifetime is more than 10 years

Model: Water seal

What can be the maximum gas line length between the biogas plant & the burner?

The maximum length of the gas line is as mentioned below for various capacities.

» 0.5m3 – 5mt (16.5 ft)
» 1m3 – 10mt (33 ft)
» 2m3 – 10mt (33 ft)
» 4m3 – 15mt (50 ft)
» 5m3 – 15mt (50 ft)
» 6m3 – 20mt (66 ft)

It is strongly recommended to keep the biogas plant as close as possible to the burner in order to avoid pressure drop.

Where can we place the biogas plant?

Biogas Plant can be placed anywhere.

» Partially below the ground level
» Above the ground level
» In terrace It is recommended to keep the biogas plant in open place exposed to sunlight.

What type of gas hose is used in biogas plant to kitchen burner?

Nylon threaded flexible gas hose.

Can Biogas be lighted using LPG lighter?

No. Biogas can be lighted only using match box or biogas lighter.

Will the bio digester quality diminishes when exposed to different weather conditions?

No. B-Sustain Biogas plants are made of FRP material which can resist ultraviolet radiation longer than poly tanks as they have a gel coating and tested for heavy impact on weather loads (such as cold & heat).

Is it possible to relocate the biogas plant?

Yes. It can be relocated easily from one location to another, any number of times.

What is the start-up (microbial charging) used initially in the biogas plant?

Cow dung is used as the initial start-up (microbial charging) for the first time only.

How many days will it take to use the biogas from the plant initially?

After feeding initial start-up, it takes minimum 15 days and maximum 30 days for using the biogas for the first time only. Then after, Biogas can be generated within time duration of 12-15 hrs after feeding the digester.

What are the materials that must not be fed in to the Biodigester?

Do not use Papers, Plastics, Glasses, Sand, Stones, Chemicals and Metal particles, Bones, Dry leaves, Stems & Sticks, Pseudo stem (Banana stem), Egg shells, Fibres (like Drumstick skin, climbers, etc.,), Acidic materials (like Tamarind, Lemon Peels, Orange Peels, etc.,) , Soaps & Detergents.

Can I identify the biogas leakage?

There will be rotten egg smell when the biogas leaks.