Regenerate urban waste
& Boost Urban Agriculture
in a close loop of carbon
Urban
Carbon
Urban agriculture should be
more productive without being so carbonated
The circular economy of carbon should be emerging
Carbon capture will be nature based...
and technology based
Our views
Allow urban agriculture greenhouses
to be heated by biomass...
While becoming carbon negative
...and fully integrated in the local circular economy
Our proposition
Biochar has proven
to be a solid CDR method...
Heated greenhouses are useful for food resilience...
...but still emits CO2 during pyrolysis
...but often rely on fossile heat sources...
to be banned
by 2030-2035
Lets make heat & CO2 from pyrolysis work for our greenhouse...
...and get rid
of the fossil fuels
Keep the biochar
Greenhouses need higher CO2 levels than ambiant air
...and heat
800-1000 PPM
430 PPM
CO2 levels vary as plants take up carbon
Excess and depletion should be balanced
With Carbon capture
we can add a carbon buffer,
clipping high levels of CO2
and sustaining low levels
And filter and clean the flue gas to use only CO2.
600-1000 PPM
430 PPM
<300 PPM
CO2 levels required to boost photosynthesis
Ambiant level
level released
IN:
Clean wood waste
Recycled / Looped:
Heat + CO2
OUT:
Produce
Biochar
Depollution plants
This way we get a
80% Nature based
20% Technology based
solution
To provide
a more permanent carbon storage
we should also grow:
-
Trees for afforestation
-
Fast rotation plants for biomass burial
Best LCA possible
Local co-benefits
CDR
Our goals:
Solar
power
+ heat
The building blocks
Greenhouse
ventilation
Flue gas
filtration
BECCS
Carbon
Buffer
Biochar
Thermal Inertia
Synergy with compost hot beds
Semi-continuous retort kiln
Compact volume
Filters and condenser
UV scrubber
Technical view
CO2 Levels and CO2 buffer
Technical view
Biochar
wood
chips
mulch
Carbon
Mix
Heat
Drainy soils
Compost
Forest
plants
Biomass energy
Composting
CO2 injection in greenhouse
Wood
waste
grade A
Timber
Upcyling
Upcycling
Gazeous
CO2
Biomass Burial
Logical view
BECCS BiCRS
methods with cobenefits
Heating
by biochar
Flue gas
filtration
DACC
buffering
CO2
monitoring
Flue Gas:
filtration, cooling, cleaning
Compost
hotbeds
Afforestation Greenhouse
External kiln
The abandoned railroad track
to "Gare des Mines"
(Coal Mine Station)
north of Paris
...The place where coal and gas were brought to Paris during 100 year.
carbone-urbain.com/urban-carbon
Malcolm Hammer 2025
mh@composturbain.com