Waste to energy


Present waste disposal methods are land-filling, incineration, composting and anaerobic digestion. Among these options anaerobic digestion is energy efficient as well as environment friendly. But multitude of operational difficulties is associated with conventional anaerobic digesters and hence it did not receive much acceptance from users. Therefore, we are introducing a field tested, innovative world class high rate anaerobic digester for efficient and safe garbage disposal.

The realization has come at a slower pace but it is better late than never. Since nothing new can be created in this world and while existing energy sources are getting depleted at alarmingly rapid rate, we must use every available resource judiciously. There are enough natural agencies, which are too keen to help us in this endeavour. Science has revealed these tools and we must use their potential to achieve the urgent call of nature "CLEAN ENVIRONMENT FOR ALL, INCLUDING NATURE ITSELF".

Then what is biogas? It is a combustible gas mixture comprising around 60% methane and 40% carbon dioxide, that is formed when organic materials, such as animal (and human) dung or vegetable matter are broken down by microbiological activity at warm temperatures (30 – 40°C or 50 – 60°C) in an anaerobic environment, that is methanization.

Using bio-methanization technology all domestic bio waste can be treated hygienically and a very good cooking fuel is produced. This helps to prevent the tendency to throw the waste materials in roads and public places. Generation of cooking gas at house hold level helps to overcome fuel crisis to a great extent.

The easily degradable waste material is fed into the Biogas plant through the inlet chamber of the plant. This waste is converted into cooking gas with the help of a special type of anaerobic bacteria. The main component of the gas produced is methane which is a renewable source of energy.

The space required for a domestic plant (1 cum) is one square meter. Time required for the installation is 1- 4 hours, depending upon the model of the plant. The gas generated from the waste of a family of 3 -5 members is sufficient enough to work a single burner stove for more than 2 hrs. every day.

The return on investment of a domestic bio waste treatment - bio energy plant is also very good. A 1 Cum plant is sufficient to save the 70% - 90% consumption of fire wood or other cooking fuels every day. Within 2 years the entire investment will be got back as cooking gas and liquid fertilizer. The benefit from the methane emission reduction is another added advantage.

Bio digestion or anaerobic digestion (AD) is a biological process that occurs when organic matter is decomposed by bacteria in the absence of oxygen (i.e., anaerobic). As the bacteria decompose the organic matter, biogas is released and captured.

Biogas consists of approximately 60% methane and 40% carbon dioxide. The remaining by product is called Digestate and is low in odour and rich in nutrients. It contains valuable plant nutrients like nitrogen and potassium. Digestate can be used as a fertilizer and soil conditioner.

Anaerobic digestion has a defined process flow that consists of four distinct phases.

1. Pre-Treatment: In pre-treatment, wastes may be processed, separated, or mixed to ensure that they will decompose in the digester.

2. Digestion: During digestion, waste products are broken down by bacteria and biogas is produced and collected.

3. Biogas Processing: Biogas produced is either combusted or upgraded and then used to displace fossil fuels. During upgrading, scrubbers, membranes or other means are used to remove impurities and carbon dioxide (CO2) from biogas.

4. Reuse or disposal of solid digested waste: Digested waste has a high nutrient content and can be used as fertilizer so long as it is free of pathogens or toxins, or it can be composted to further enhance nutrient content.


Developed by CSIR-Indian Institute of Chemical Technology, Hyderabad based on extensive research funded by the Ministry of New and Renewable Energy, Government of India, this innovative prefabricated Modular High Rate Digester ensures safe disposal of garbage. Convenient to install in apartments, hotels, resorts and other places of garbage accumulation. It can digest wastes without polluting the environment.

Modular High Rate Digester is fully automatic, free from operational difficulties and manual handling. Wastes can be directly dropped into the digester and it facilitates complete digestion. BRCPL is the authorized license holder and manufacturer of Modular High Rate Digester in India.

Modular Bio Digester is a high rate bio-digester developed for safe disposal of garbage. The digestion of waste is carried out by a set of bacteria presents inside the digester and it converts bio-degradable substances into biogas. Modular Bio-digester is entirely different from conventional biogas plants.

It has advanced engineering principles coupled to doctrine of bio-technology to accomplish superior process efficiency, excellent operational convenience and trouble-free functioning. Design of Modular Bio-digester is based on HIGH RATE BIOMETHANATION TECHNOLOGY and it is comparable with other world class AD Technologies.

High rate bio methanation technology leads to superior process efficiency in terms of percentage solid reduction. Superior process efficiency, excellent operational convenience and trouble-free functioning are accomplished in Bio digester with the following design principles: -

  • Multistage digestion.
  • Intense, self-mixing system for digester contents using differential pressure.
  • Capacity to withstand accidental hydraulic shock loads.
  • Two phase digestions.
  • Particle size control without external grinder.
  • Short retention time.
  • Convenient and self-driven feeding without external pump.
  • Delinking solid retention time (SRT) and hydraulic retention time (HRT).
  • High organic loading rate.


1. Capacity Range

Capacity range from 50 kg per day and above

2. Treatment efficiency

Treatment efficiency 90% in terms of solids reduction

3. Fully Automatic

Fully automatic and no manual operations.

4. No Pre-processing

Waste can be directly dropped without pre-processing

5. Less Water Consumption

Less water consumption and no secondary effluents

6. Low Power Consumption

Negligible power consumption (less than 0.10 unit/day

7. Hygienic

Completely sealed and free from odor, rodents, insects, etc.

8. Environment Friendly

Completely safe and environment friendly

9. Biogas Generation

Biogas obtained as fuel

10. Affordable

Affordable cost, aesthetic looks and minimum space required

11. Process variable

 High Loading Rate and Short Retention Time

12. Material of Construction

 Mild steel with epoxy coating.


  • Hotels, Resorts, Marriage palaces
  • Hostels, Schools, Institutes, Universities
  • Hospitals
  • Residential flats, Housing colonies, Domestic houses
  • Factory canteens
  • Fish & Vegetable markets
  • Food processing industries
  • Temples, Gurudwaras etc.

Customer satisfaction, safety, process efficiency, trouble-free operation and environment protection are the major objectives of BRCPL.