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1/22
Indoor air purification by plants
Majbrit Dela Cruz
2/22
Outline My background
Background of the topic
Plants purify the air
– in closed chambers
– in offices
What will I be investigating?
My work so far
3/22
My background
4+4 PhD student 2010-2014
BSc in horticulture
Main supervisor: Renate Müller (IJØ)
Co-supervisor: Jan H. Christensen (IGM)
4/22
Background of the topic
Time spend indoors: up to 90%
Amount of air breathed per day: 21-23m3
Indoor air can be more polluted than outdoor air
Sick-building-syndrome
5/22
Sources of indoor air pollutants
6/22
Plants purify the air – in closed chambers
7/22
Plants purify the air – in closed chambers
8/22
Plants purify the air – in closed chambers
Removal of VOCs is dependent on
Light intensity
VOC concentration
VOC and plant species
VOCs being single or in mixture
Micro organisms in the soil
9/22
Light intensity
Increasing light intensity generally results in increased VOC removal
Not always so at low light intensity
10/22
VOC concentration
In absolute terms:
Increasing VOC concentration results in increased VOC removal
In relative terms:
Increasing VOC concentration results in decreased VOC removal
11/22
VOC concentration
12/22
VOC and plant species
VOC removal differs with VOC and plant species
13/22
VOCs in mixturesRemoval of a single VOC is different from removal of VOCs in mixtures
14/22
Micro organisms in the soil
Can account for nearly all VOC removal but plants are important for maintenance
Removal by aboveground part vs. belowground part is 1:1 at day and 1:11 at night
15/22
Plants purify the air – in offices
Only few studies
Plants can to some extend reduce VOC levels
16/22
Plants purify the air – in offices
Air-conditioned Naturally ventilated
17/22
C-metabolism
Flowering
VOCs being singleor in mixtures
Soil microorganisms
CO2
Temperature
Light
Watering statusof the plant
VOC removal by plants
What will I be investigating
18/22
My work so far
Light: 45mol/m2/s
Temperature: 20°C
Light/dark: 12/12h
System setup
Adsor-bent tubes
CO2 measurement
Pollutant chamber
CO2
Compressor
19/22
My work so far System setup
20/22
My work so far Removal of toluene by Hedera helix
80% removed after 8 hours
= 60g/m2/h
21/22
22/22
http://www.pension-emma.it/willkommen.asp
http://www.agrocangall.com/pages/frame_e.htm
http://www.vitality4life.com.au/clean-air/why-purchase-an-air-filter/
http://kontorindretning.blogspot.com/
http://www.houseofplants.co.uk/healthytop10.htm
http://www.onetrendblog.com/410/plant-powered-air-cleaner/
http://www.ecosignal.org/?p=4952
http://www.nikibrown.com/designoblog/2009/11/01/funny-strang-japanese-inventions/
http://www.hylandseeds.com/agronomy_facts.php
http://www.dreamstime.com/cartoon-virus-germ-bacteria--image3234482
Picture references
http://www.engrish.com
http://www.ambius.com/ambius-catalogs/tabletop-credenza-plants/hedera-helix/index.html