[Gasification] Biochar et al.

Sun Dec 8 17:37:37 CST 2013

greeting to all from semiarid  Brasil

  Very  good interdiciplinary  world level good list discussion is hoing on
 about biochar .
      As hydogel is comercially used  to retains water  to make possible
 forest biomass planaation  in dry lands . Can any one have information as
 this market can be very good econ0moc potencial as biochar adsorption  of
water can help to aid  slow relase organic fertilizar , making more
effective e less toxics

yours truely
Pannirselvam

ᐧ

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On Sun, Dec 8, 2013 at 9:16 PM, Paul Judd <sukiipooru at gmail.com> wrote:

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>
>  On 07/12/13 09:00, David Murphy wrote:
>
>
> Greetings Biochar/Gasifier people !
>
> Everybody & his dog seems to have something to say about
> charcoal/biochar/biochar-compost mix and so on.    Well, here’s another
> dog to bark his piece !
>
> Biochar is often seen as the great agricultural panacea, but *it is not*.
> Biochar is a name given to plain ordinary charcoal to indicate that it is
> destined for use in soil improvement, but basically it is still plain
> ordinary charcoal, just crushed into smaller particles.  In some
> circumstances it is a very beneficial tool but it is not magical as some
> proponents seem to think.   Just remember, all charcoal has a bio-origin -
> wood.
>
> In some Ag. trials in Australia it significantly improved crop volume
> (treble in one case) but in other instances, nothing worth writing home
> about.  It depends on what the soil is like to start with.
>
> Charcoal is stable.  That means it does not take part in any composting
> system (which is one primarily of bacterial digestion) and it is
> indigestible so that when offered as a dietary supplement (in poultry food
> for example) it passes through the digestive system physically unchanged
> but will adsorb a high proportion of the gases and some toxins produced in
> the process of digestion, because that is what charcoal does.    For this
> reason, it's adsorption capability, poultry will generally do better on a
> little charcoal.
>
> Quite a few pages could be filled on the beneficial services provided by
> charcoal as it travels through the digestive system, but it does it as
> charcoal only and as nothing else.   By all means use a little in the feed,
> you can only benefit.
>
> The only physical way to change the nature of charcoal is to burn it.
> That is why it lasts in soil (or wherever it is) for thousands of years.
>
> It has an incredibly high surface area of 360 m2 (varies) and is a mass
> of minute tunnels which in turn means a very high volume and gases become
> trapped in these tunnels.  It does not *ab*sorb, it *ad*sorbs and traps
> only.  The difference between absorb and adsorb is the same as the
> difference in liquids of suspension and solution.  Clay particles will be
> in suspension, sugar and salt go into solution.
>
> Charcoal is useful in an aerobic composting system because again of the
> entrapment of air in the tunnels.   A composting system goes well if
> there is enough oxygen bearing air available to the bacteria which are a
> significant part of the system.   The more air, the higher the population
> of bacteria (other factors being OK).    The charcoal itself is
> inoperative, and doesn’t change, nor is it a catalyst, it simply provides a
> service.   It will only provide a haven for soil benevolent bacteria if
> there is something trapped in the tunnels which the bacteria can eat.
>
> Charcoal is a good adsorber of gas and liquid simply because that is what
> it does.   Zeolite on the other hand, can have an even higher surface are
> per gram and has a propensity to entrap gases, most particularly nitrogen
> in it’s various forms – as gas – ammonium for example – and in liquids as a
> salt of NO3 .   It actually draws them in (like a magnet attracts ferric
> objects) where charcoal just takes it as it comes.    It is easy to see
> also why charcoal is so effective as a filter, but if you have a solution
> rich in nitrogen, run it through Zeolite and the N will be removed.  Add
> some to the litter in poultry grower sheds, there will be fewer
> mortalities because the ammonia which sometimes will asphixiate small birds
> will be absorbed.    Zeolite will take N out of solution, charcoal will
> not.    There's 40 natural forms of Zeolite and more than another 150 can
> be synthesised, so choose carefully for the one most appropriate to your
> problem.    Zeolite can perform an amazing range of actions.    Once used
> and applied as fertiliser, Zeolite subsequently will release the N slowly
> and remain in the soil as a balancer of N.  Too much, it will take it in
> (so that the soil pH is not lowered) and release it as required.
>
> Charcoal’s great stuff though, it's easy to make and holds answers to a
> lot of problems - but not all !
> David Murphy.
>
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>
>  BioChar is not "ordinary charcoal".
> Charcoal is usually made at temperatures above 1000C and all volatiles are
> removed.
> Bio-char is made a lower temperatures, 400~600C just above spontaneous
> combustion temperature of organic material (wet or dry). It contains tars
> and a different structure withing the hollows than `ordinary charcoal`. It
> is the structure and the tars that make a good home for soil micro
> organisms. It also holds water and minerals better than charcoal.
>
> See  http://www.biochar-international.org/ for more detailed information
> and projects.
>
> Local Australian groups:
> http://biocharproject.org/
> http://www.bioenergyaustralia.org/
>
> --
> Paul Judd B.App.Sc. Secondary Metallurgy, Dip Electrotechnology Renewable Energy,  Dip Sustainability
> Trainer and Sustainability Advisor
>     PAJeco    Sustainable Education
>     Sustainability: Learning to live today but leaving enough to live tomorrow
>     http://www.pajeco.com.au
>     paul.a.judd at pajeco.com.au
>     +61415518134
>
>
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