anaerobic digestion of waste biomass to … waste to energy.pdf · new delhi – india. 1 anaerobic...

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KPS Consultants & Impex Pvt. Ltd., New Delhi – India. 1 ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE BIO - CNG ELECTRICITY BY MEANS OF BIOGAS GENSET FUEL FOR STEAM BOILER Anaerobic Digestion is a process where waste biomass is converted into useful products like Biogas and Organic Fertilizer by the action of micro-organisms in the absence of air. Biogas is typically a mixture of Methane, CO2 and traces of contaminant gases like H2S. The digestate leftover, after drying is used as an organic fertilizer. The biogas can be used to fire a boiler to produce steam, run a biogas genset to produce electricity or be converted into BioCNG for further energy use.

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Page 1: ANAEROBIC DIGESTION OF WASTE BIOMASS TO … WASTE TO ENERGY.pdf · New Delhi – India. 1 ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE BIO - CNG ... Project Metrics

KPS Consultants & Impex Pvt. Ltd., New Delhi – India. 1

ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE

BIO - CNG

ELECTRICITY BY MEANS OF BIOGAS GENSET

FUEL FOR STEAM BOILER

Anaerobic Digestion is a process where waste biomass is converted into useful

products like Biogas and Organic Fertilizer by the action of micro-organisms in the

absence of air. Biogas is typically a mixture of Methane, CO2 and traces of contaminant

gases like H2S. The digestate leftover, after drying is used as an organic fertilizer. The

biogas can be used to fire a boiler to produce steam, run a biogas genset to produce

electricity or be converted into BioCNG for further energy use.

Page 2: ANAEROBIC DIGESTION OF WASTE BIOMASS TO … WASTE TO ENERGY.pdf · New Delhi – India. 1 ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE BIO - CNG ... Project Metrics

KPS Consultants & Impex Pvt. Ltd., New Delhi – India. 2

We suggest a continuous anaerobic digestion system with multiple digester vessels

using a Thermophilic process at 50 to 60 ºC (elevated temperature accelerates the

digestion process and hence production of methane gas). The biogas produced can be

used to fire a boiler for producing steam. Contaminant gases like H2S are removed

from the biogas to run a genset to produce electricity. Hot flue gases from the above

two processes are used to heat the digester vessel. Alternatively, CO2 is removed from

the biogas and it is compressed to produce BioCNG. Recycling of water ensures that

limited amount of fresh water is used for slurry-making.

Various types of waste biomass that can be used are Food processing industry waste like potato & other vegetable / fruit peels

Agricultural waste & residues, off spec. / rotten fruits & vegetables

Food waste from hotels, restaurants & supermarkets.

Project Metrics

One metric ton of biomass can be used to generate around 80 M³ / day of biogas.

15 metric tons of biomass consumption per day can generate around 1200 M³ of

biogas per day.

1200 M³ of biogas can be used to run a 100 kW genset for 20 hours per day

besides providing heating for digester vessel.

Electrical power generated is around 2000 kWh (units) and equivalent saving in

grid power is Rs. 7.0 X 2000 units = Rs. 14,000 per day or Rs. 50.0 Lacs per year.

Diesel consumption for a 100 kW (125 KVA) genset is around 20 liters per hour (at

75 % load) hence equivalent saving is 20 X 20 X Rs. 58.4 = Rs. 23,360 per day or

Rs. 85.0 Lacs per year.

Annual maintenance cost as well as pollution from a biogas genset is much lower

as compared to a diesel genset.

1200 M³ of biogas can be converted to around 480 kg of CNG and equivalent

saving is Rs. 38.15 X 480 = Rs. 18,300 per day or Rs. 67.0 Lacs per year

Page 3: ANAEROBIC DIGESTION OF WASTE BIOMASS TO … WASTE TO ENERGY.pdf · New Delhi – India. 1 ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE BIO - CNG ... Project Metrics

KPS Consultants & Impex Pvt. Ltd., New Delhi – India. 3

Waste biomass to generation of Electrical Power / BioCNG / Steam makes sound

economic & business sense even without government subsidies as well furthers the

‘green’ credentials of the business – waste to energy, renewable energy, reducing

carbon footprint, reducing landfill, reducing cost of disposal of waste from food

processing units and agricultural waste etc. The Ministry of New & Renewable Energy

provides subsidy on per kW basis of the system cost under Biogas Power (Off-grid)

programme.

Conversion of Biogas to BioCNG

We are a leading Project & Technical Consultancy organization in the field of Recycling

(e.g. waste tyres & PET bottles, waste biomass to energy), thermoplastics, rubber and

composites. We can provide complete assistance for planning & implementation of

Waste Biomass to Energy plant. We can prepare a Techno Economic Project Feasibility

Report as well as Detail Project Report for your decision making, bank finance and govt.

statutory clearances.

Page 4: ANAEROBIC DIGESTION OF WASTE BIOMASS TO … WASTE TO ENERGY.pdf · New Delhi – India. 1 ANAEROBIC DIGESTION OF WASTE BIOMASS TO PRODUCE BIO - CNG ... Project Metrics

KPS Consultants & Impex Pvt. Ltd., New Delhi – India. 4

Once you decide to go for the project we can assist you in all activities related to the

implementation of the project i.e. sourcing of plant & machinery, plant layout &

architectural drawing, sourcing of utilities & support equipment, installation &

commissioning of the plant, trial production, quality control aspects, tie-up with biomass

waste producers, tie-up with power / steam / BioCNG consumers.

We look forward to hearing from you.

Dr. ANOMITRA CHAKRAVARTY KPS Consultants & Impex Pvt. Ltd.

812 Devika Tower, 6 Nehru Place

New Delhi - 110019, India.

(T): +91-11-26213885

(F): +91-11-41616899

E-mail : [email protected]; [email protected]

Web: www.kpsimpex.com