Biogas Capture From Palm Oil Mill Effluent for Power Generation on 27.3.2014 (for MR CHIN)

8/11/2019 Biogas Capture From Palm Oil Mill Effluent for Power Generation on 27.3.2014 (for MR CHIN)

1/13

Biogas Capture

From

Palm Oil Mill Effluent

ForPower Generation

Prepared ByIr Wong Keng Chew


2/13

Conventional Practice of Treating

Palm Oil Mill Effluent (POME)

a) The POME is put into anaerobic ponds.

b) Problembiogas is evolved from the anaerobic ponds.

c) Biogasconsists mainly of methane and carbon dioxide, with small

amounts of hydrogen sulphide, water vapour and other gases.

Methane and carbon dioxide are the main green house gases that

contribute to global warming, with methane being 21 times more

potent than carbon dioxide. By harvesting the biogas for fuel, we

are not only utilizing a renewable source of energy but also

helping to alleviate the global warming effect.

Anaerobic Pond

Pome Influent Pipe Pome Effluent Pipe

Biogas (Mainly methane)


3/13

New Practice To Treat POME

a) The Biogas is extracted and retained instead of beingreleased freely into the atmosphere.

b) Biogas can be extracted and retained by two different

methods, viz:-

i. Lagoon Digester

ii. Tank Digester


4/13

Lagoon Digester

The lagoon digester is

installed by covering theexisting anaerobic pond with

HDPE sheet. The biogas is

retained below this cover

and part of the volume is

recirculated by blowers to

agitate the POME to speed

up the anaerobic digestion.

Pome Influent

PipePome Effluent Pipe

Biogas

To scrubber

HDPE

Cover


5/13

Tank Digester System

The tank digester uses a

cylindrical tank to contain thePOME for anaerobic digestion to

biogas. Blowers are also installed

to agitate and recirculate the

POME for even digestion and to

speed up the process.

Biogas evolved is held in a

gas holder, before further

processing (i.e sending to the H2S

scrubber).

Gas HolderAgitator

Pump

Biogas

Tank Digester


6/13

Comparison Between Lagoon Digester

And Tank Digester

Lagoon Digester Tank Digester

a) Cost Lesser cost

-Because the flexible HDPE can

be installed over the pond,

thus saving the cost for a

separate biogas (buffer) holder.

Higher cost

-Because of the need of new

tank and a buffer holder.

b) Time to construct Lesserconstruction time Longerconstruction time

c) Productivity Less biogas produced(16m3 of biogas/T of POME)

Longer digestion time

(30days)

More biogas produced

(28m3 of biogas/T of POME)

Shorter digestion time

(15 days average)


7/13

Biogas Processing & Power Generation

After the digester,

the biogas stillcontains various

impurities; mainly

moisture and H2S.

H2S is removed by a

bioscrubber and the

moisture by cooling

and condensation.

The processed

biogas is fed finally

to the gas engine

alternator whereelectricity is

generated.

Bio Scrubber

From

Digester

DryerGas Engine

Generator


8/13

H2S can be

removed by

biological means; by

passing the biogas

containing H2S

through a mediumwhich has microbes

growing in it. These

microbes feed on

H2S and thus

purifies the biogas.

Biogas Out

Biogas In

Bioscrubber

Bioscrubber

(Vertical Type)


9/13


10/13


11/13


12/13


13/13

THANK YOU

Documents

Biogas Capture From Palm Oil Mill Effluent for Power Generation on 27.3.2014 (for MR CHIN)