Annex setup plants in other IOC refineries. Cost

Annex 4. Bio-CNG for Delhi NCR

 

IndianOil
R&D’s Bio-CNG Technology for Delhi NCR

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Indian Oil Corporation Limited (IOCL)

03 August 2017, New Delhi

 

Introduction

Bio-methanation is a process
of converting organic wastes into biogas and digestate by anaerobic
microorganisms in the absence of air. Products of bio-methanation are biogas
and digestate. Biogas is a mixture of methane, carbon dioxide and traces of
other contaminant gases. Biogas can be used for various applications such as
power generation, heating, cooking and transport applications. Digestate
contains valuable plant nutrients such as nitrogen and potassium to be used as
a fertilizer and soil conditioner.

 

IndianOil
R Technology

IndianOil R has
developed in-house bio-methanation technology for conversion of kitchen waste
into biogas that can be used as bio-CNG. The technology deploys high performing
bacterial inoculum which is responsible for conversion of organic waste into
biogas with high methane (>80%) content (as indicated in Table A4.1) vis-a-vis
60-70% reported in conventional biogas plant technologies.

 

Table A4.1 Typical composition of biogas
generated through IndianOil R bio-methanation process

Component

Methane

Carbon Dioxide

Nitrogen

Composition
(vol%)

80-85%

11-13%

3-5%

 

 

Current
Status

Performance of 50 kg/day
bio-methanation plant was validated at IndianOil R. Based on the
encouraging results; the microbial inoculums were successfully evaluated in an
existing 250 kg/day bio-methanation plant at Panipat Refinery. Efforts are
underway to setup plants in other IOC refineries.

 

 

 

 

 

 

Cost
Estimates

The Table A4.2 shows details of cost estimates for
installing a 250 kg/day bio-methanation plant with expected biogas yield and
composition.

 

Table A4.2 Cost
estimates for installing a 250 kg/day bio-methanation plant

Food waste loading kg/day       

250

Expected
biogas/bio-CNG production Nm3/day

5-6

Dry
solid manure kg/day

20-25

Capex

Estimated
plant cost without CO2 removal

12.6 Lakhs

Estimated
plant cost estimate with CO2 removal

15.6 Lakhs

Opex*

Cost of inoculum (one time)

INR 60,000

Cost of Chemicals per annum

INR 50,000

      *Cost of
manpower (2 nos.) will be extra

 

Way forward

In Delhi NCR, IOC’s
technology can be deployed at integrated townships, colleges, hotels and
Municipal Corporation identified locations to utilize this gas for captive
cooking purpose. Further, IOC is in the process of marketing the CNG source
from biogas plants in few states of the country. The potential of bio-CNG as
automotive fuel may also be explored in Delhi NCR to improve the ambient air
quality. Use of fuel cells can also be explored using bio-CNG both for
stationary & mobility applications.