Biomass Based-Activated Charcoal for Adsorption

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1 Department of Energy and Environmental Engineering, IGSES, Kyushu University, Japan2 International Institute for Carbon-Neutral Energy Research, Kyushu University, Japan

3 Advanced Device Materials, Institute for Material Chemistry and Engineering, Kyushu University, Japan*E-mail: chairunnisa.365@s.kyushu-u.ac.jp

Biomass Based-Activated Charcoal for Adsorption Dehumidification in Humid Region

Chairunnisa1,2*, K. Thu1,2, T. Miyazaki1,2, F. Miksik1,2, J. Miyawaki3

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Kyushu University Asia Week 2021

Problems caused by humidity

Source: Building Performance Institute, Inc.

Tropical countriesSub-tropical coutries (in

summer)

% Relative humidity: 70 – 100% (humidity ratio of 0.17 – 0.21 kg/kg

% Relative humidity: 80 – 100% (humidity ratio of 0.024 – 0.27 kg/kg

Why dehumidification or drying technology is highly needed in Asia?

Air dehumidification in tropical countries consumed >15% of total energy for building.

Needed technology with lower energy consumption!

1 Thermal Adsorption Dehumidification2

Separate the humidity removal and temperature control.

Provide 30 – 50% of energy saving.

Thermal adsorption dehumidification

Desiccant material with low regeneration temperature is needed.

Activated charcoalSource: goodhousekeeping.com

Can purify the air

Can be regenerated using lower temperature

Can be produced from low-cost precursor → waste biomass

Has thermal stability and non-toxicity

Desiccant3

4 Activated Charcoals for Dehumidification

Activated Charcoals

(AC)

InputAmbient Air:

Indonesia(Humidity ratio:

0.17 – 0.21 kg/kg)Adsorption Isotherm

Processed Air

Air

heate

r

Return Air:26oC, humidity: 60%

Exhausted Air

Moisture Adsorption Measurement

Walnut shell (WS) Acorn nutshell (AS)

WS-AC & AS-AC

Activated Carbon Production Dehumidification Simulation

Dehumidification Capacity

NS = North SumateraSS = South SumateraWJ = West JavaBa = BaliEK = East Kalimantan

NS = North SulawesiMa = MalukuPa = Papua

• Dehumidification capacity

(w) of ACs > silica gel.

• ACs can be promising

alternative desiccants for

dehumidification in humid

regions.

• ACs can be regenerated

using waste heat energy

Conclusions

Different tendency in

different region &

regeneration temperatures

(Treg)!

Source: Daikin & https://allabout-japan.com/