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Bio-CNG Production in India – Technology Vendors



evnext-logo-v-smallThis post is a part of BioBiz’s Bio-CNG Perspectives.

BioBiza division of EAI, is a leading market intelligence & strategic consulting firm for the Indian bio-based sectors.


 
The growing RNG market is marked by several technology solution providers who have contributed to the development of the conventional anaerobic digestion technology.

Following is the list of major technology providers met by EAI team and their views on RNG production.

  1. B-Sustain
  2. Kankyo Cleantech
  3. Organic Recycling Systems
  4. Primove Engineering
  5. GPS Renewables
  6. SLPP Re-New LLP
  7. Quantum Green
  8. Ahuja Engineering
  9. FOV Biogas
  10. Carbon Masters
  11. Atmos Power
  12. Radix Lifespaces

Following table analyses the views of technology providers for RNG production on various parameters.

Parameters B-Sustain Kankyo Cleantech Organic Recycling Systems Primove Engineering GPS Renewables SLPP Quantum Green Ahuja Engineering FOV Biogas Atmos Power Carbon Masters Radix Lifespaces
Types of technologies Fixed type digesters
  • Plug and play models     
  • Integrated systems
  • Modular plants
Modular  plants based on feedstock CSTR technology with rotor blades  Pre-fabricated biogas plants Modular, CSTR technologies Fixed dome, CSTR type Plug and play biodigesters CSTR based dry fermentation and plug flow type wet digesters They offer solutions for biogas purification Plug and play digester models FRP based technology
Extent of maturity of technology like cellulosic and syngas based digestion No data No data No data No pre-treatment No data No pre-treatment No pre-treatment No data Use of fabric based digesters having an advantage over concrete or steel digesters No data No data No data
Capital costs for co-digestion and agro waste based plants Rs. 15 crores for normal 100 TPD plant 50 TPD paddy straw – Rs. 25 crores 2 TPD biogas plants – Rs. 60 lakhs Rs. 20 crore – 5 TPD – agro waste / 30-32 crore for 10 TPD 1 TPD – Rs. 41 lakhs – normal biogas plant, upgradation unit higher 250 tons – 30-35 crores Rs. 15 crores for a 100 TPD plant Rs. 40 lakhs for 2 TPD plants Rs. 1 crore for 10 TPD plant Rs. 15 crore for 100 TPD plants Rs. 10-12 crores for a 50 TPD plant No data
Area requirement 150 m2 – 2 TPD 5 acres for 100 TPD agrowaste 500 m2 for 5 TPD plant 3 acres – all except storage 2 TPD plant – 150 m2 250 ton – 7 acres – 10 acres 50 TPD – 1.5 acres including storage No data 0.4 acres for a 10 TPD plant No data No data 1 acre plant area for a 40 TPD plant
Operational costs No data High for 2 compressors No data Rs. 30 / kg of RNG No data Cost of Power – Rs. 6-8 / kg of RNG Power – Rs. 8-9 / kg RNGOperational cost –  Rs. 22-25 incl. capex amortizationConversion cost – Rs. 15-16 No data No data No data No data No data
Pre-treatment techniques No data Novel semi-aerobic hydrolysis technology No data No pre-treatment No data No pre-treatment No pre-treatment No data No data Hydrolysis for agro waste No data No data
Minimum scales of operation ·         2 tons per day·         Economically viable –  20 TPD No data 15 TPD 5 TPD – agrowaste No data 20 TPD 25 TPD 300 kg / day No data No data 50 TPD – economically viable No data
Feedstock flexibility Any feedstock can be used – agro, food, dairy ·         Agro waste·         Mixed feedstock Both starch and cellulose Agrowaste Not for cellulosic waste and garden wastesNo co-digestion All organic wastes Mainly food and industrial waste All organic wastes All organic wastes for dry type digesters and fabric based not suitable for food waste alone No data All organic wastes All organic wastes
Avenues to increase product yield No data Membrane type purification technologies No data Innovative technology (bacteria) No data Hollow fibre membrane, co-digestion Co-digestion No data No data No data No data No data

Inferences on technology evaluation

  • Technology:  Modular, plug and play digester models are ideal for a large scale RNG plant
  • Extent of maturity: While technically complex pre-treatment methods such as enzymatic is critical for suitability of lignocellulosic feedstock use in anaerobic digester, recent innovations by technology providers have eliminated these complex pre-treatment steps by introducing novel bacteria and simple hydrolysis techniques
  • Capital cost: The capital cost for setting up a co-digestion based RNG plant could be approximately Rs. 15 crores, while for an agro waste based plant, it could cost around Rs. 23-25 crores.
  • Operational cost: Conversion costs (power + consumables + labour) is in the range of Rs. 15-17/kg of RNG. Of the total conversion costs, 35-40% goes in the production of RNG, while the rest goes for biogas production. About Rs. 7-9/kg RNG goes for power generation. Compression process is found to consume the maximum amount of electricity. Total power requirement for a 100 TPD plant is 78000 kWh/day, with a connected load of 300 kVA.
  • Area requirement: Area required for setting up a 100 TPD co-digestion RNG plant comes to about 3 acres while for plants using increased quantities of agrowaste and press mud, it could come to about 4-5 acres owing to feedstock storage requirements.
  • Minimum scale of operation: For better return on investment, the minimum scale of plant should be in the range of 15-25 TPD
  • Feedstock flexibility: Most of the commercially available technologies are flexible for any type of feedstock – starch and cellulosic and hence mixed feedstock could be suitable for better yield compared to 100% starch or cellulosic feedstock
  • Manpower requirement: Most of the currently available technologies are automated and hence require only about 3-4 people – 1 shift operator, 2 tractor drivers, 1 microbiologist
  • Avenues to increase yield: Use of novel purification technologies such as membrane type purification, innovative microbes and mixed feedstock could be some of the possible avenues to increase RNG yield

In addition to the above technology providers, IOC is also developing a patented 2-stage anaerobic digestion technology to use agro waste as the primary feedstock for RNG production. IOC claims that the yield of methane comes to about 85% before purification, while it is only 55-60% in other technologies. Details on IOC technology are given.

IOCL biomethanation technology

Developed two stage biomethanation process for conversion of kitchen waste to biogas

  • In the first stage biodegradable organic fraction present in waste gets extracted into liquid form
  • In second stage organic matter present in liquid is converted into biogas in the presence of high performance bacterial inoculum 

IOCL biomethanation technology

Figure: IOCL biomethanation technology

Typical composition of biogas generated

Component Methane Carbon-di-oxide Nitrogen
Composition (vol%) 80-85% 11-13% 3-5%

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Categories: Bio-CNG production process, Technology Vendors

Author - Narasimhan Santhanam


Thank you for reading this post – hope it was helpful. You can connect with me at narsi@eai.in. My detailed profile here and my LinkedIn profile here

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About EAI and BioBiz for Bio-CNG

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