Combined CO2 and H2S removal from Biogas

By

Keren Jenifer Rajavelu University of Duisburg-Essen

PhD student

Civil engineering

Urban Water and Waste Management

Supervised By

Prof. Dr. Martin Denecke

Outline

Introduction Objectives Research

Aim Personal

Introduction

Introduction

Components % vol

Methane 50 %

Carbon di oxide 30- 38 %

Hydrogen sulphide 100- 900 ppm

Treatment of Biomass Fermenter Natural Gas Filling Station

Natural gas line Biomethane Feed Treatment Biogas Renewable raw

materials from the

region

BHKW

Upgrading Biogas

Biogas Desulphurization CO2 removal

16.05.2014

www.stroudsystems.com

4

H2S highly toxic, corrodes pipes

and containers

CO2 Reduces calorific value and

hence the fuel efficiency

Objective

H2S removal

using bacteria

CO2 removal using

Bottom ash

Combination and

optimization

Energy

Efficient

process

Research Aim – H2S Removal

• Biological desulphurization

• Isolation of SOB (sulphur oxidizing bacteria) from activated sludge

• Effect of operating parameters such as air to biogas ratio, flow rate,

gas retention time will be studied in a biofilter lab scale reactor

• Elimination capacity, loading rate, removal efficiency for the scale up

of reactor will be determined

The main reaction involved:

H2S + ½ O2 Sº + H2O

Research Aim – CO2 Removal

• The main reaction principle involved:

• Lab scale reactor for efficient CO2 removal using bottom ash

• Parameters – CO2 pressure, ash humidity, Temperature and L/S

ratio will be studied and optimized

The main principle involved:

1) CO2 + H2O H2CO3

2) H2CO3 + Ca(OH)2 CaCO3 + 2H2O

Combination and Optimization of both process –

Process layout

Personal Introduction

Keren Jenifer Rajavelu

Study background:

• Bachelor – Bachelor of Technology in biotechnology, India

• Master – Master of Technology in Energy engineering, India

Work Experience:

• Research Fellow – Council of Scientific and Industrial Research(

CSIR), India

• Worked on Energy analysis of Fluidized bed roaster along with

Scientist. Dr. Venkatraman

Current Position • PhD research scholar

• Supervisor – Prof. Dr. Martin Denecke

• Research Team - ADGE