Bio energy from kitchen waste
Energy from waste: The biogas plant at Velankani Tech Park.

Velankani Tech Park is situated at Electronics City in Bangalore and is spread over an area of 23 acres, comprising several offices.

The campus has about 4,500 working professionals.

The main challenge for Velankani was the disposal of waste kitchen material. “The waste food in the kitchen was being discharged either in the water bodies or the landfills. The cost involved in carrying the waste away from the city was quite high. We wanted a better solution which is economical and eco-friendly too. So we decided to take the help of Enzen Global Solutions to set up a biogas plant at the campus,” apprises V S Gangadhara Rao, Director, Velankani Renewable Energy Pvt Ltd  Installing the biogas plant is easy, say the experts at Enzen. Different sizes of gas plants are available, based on the cost and site conditions. The size and cost of the bio gas plant will vary according to the demand of the organisations.

The biogas plant at Velankani uses the process of biomethanation.

“When the waste is dumped into the digester of the biogas plant, anaerobic digestion of organic material starts automatically. With the help of bacteria, waste food starts releasing methane gas.

This process is called biomethanation. Once methane is generated, it is collected in a biogas holder. 

From the gas holder, gas is used in the kitchen with the help of pipelines that are directly connected to the gas holder,” explains Ramakumar P, Associate Vice President, Renewable Energy at Enzen Global Solutions, an energy and environment consulting company.

What has been achieved
The biogas plant is designed in such a way that it digests 250 kg of waste material per day.

In return, this plant generates 1500 kg of LPG in a year and as a by-product, it generates 40 tonnes of manure per year.  “It is very cost-effective as the pay back period is less than three years. Besides, there is no maintenance cost except for cleaning the digester two times a year,” says Ramakumar. “There is a saving of around Rs. 270 per day which is around Rs 1 to 1.2 lakh per year.  “By installing the biogas plant, we have not only saved money but have maximised the utilisation of resources by converting organic waste into high quality cooking gas. We also use the manure generated as a by product for our gardening purposes,” says Rao.

“But, it is not applicable to non-biodegradable products. One should take care at the time of separating organic waste like leftover food from the non-biodegradable wastes like plastic spoons,” he adds.

(If you/or your organisation is working on such initiatives, write to us at

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