[Gasification] [biochar] Re: Re: Characterization of waste water from biomass gasification equipment: A case-study from Cambodia

Stephen Joseph joey.stephen at gmail.com
Sun Jan 17 11:08:04 CST 2016

Dear Friends

There is another solution and that is to put a small tar cracker at the
base of the gasifier.

You have to inject some very hot air just above the grate.  This early work
was done by Mike Connor at Melbourne University.

You really cut down the amount of tar coming out of the gasifier thus
cutting your waste water treatment requirements.

Also if you can breed the right bugs the small amount of tar you produce
 can then be composted

I am in Ethiopia but somewhere I have Mike students thesis.  Mike has
retired but I may be able to track him down.

Corner Peacocke also did some work on this and we used an external tar
cracker using a mixture of hot air and hot steam.  The higher the temp the
lower the amount of air required.

Regards from the North of Ethiopia

Stephen Joseph

On Sat, Jan 16, 2016 at 3:17 PM, Paul Anderson psanders at ilstu.edu [biochar]
<biochar at yahoogroups.com> wrote:

> Dear Gasification Listserv and Biochar Listserv,
> The excellent comment by James Joyce (below) did not reach the
> Gasification readers.   It only went to the Biochar readers.   Interesting
> for two reasons (overly simplified, but to make a point):
> 1.  Gasification for power (engines) is what causes the problem of
> contaminated waste water, but those readers did not see the "solution
> offered".  THEY are the people who could test and evaluate the solution.
> 2.  Biochar production (for agriculture and carbon sequestration) has been
> proposed to make a filter-char that is to be burned, which is what biochar
> production is trying not to do.   That is, char as filter for wastes made
> by trying to burn all of the biomass to ash.
> Those of us who are subscribed to both lists will see the full
> discussion.   Let's hope that this is a functional solution.
> (Of course it is better if the nasty contents in the waste water were not
> created in the process of making the electro-mechanical power.)
> To James Joyce, I say "Thanks."
> Paul Anderson
> James Joyce wrote:
> Seems to me that the smallest foot print treatment would be to filter the
> water through char, gravity dewater and then dry the char to less than 30%
> moisture, then combust it at over 1000 deg C in a chamber that maintains a
> 2 second residence time for the gases released from the combustion. That
> will yield useful heat while destroying the recalcitrant hydrocarbons. In
> locations with weather that does not make solar or even bed drying viable,
> the process will generate more than enough heat to run a heated air drier.
>  After the past mess if dealt with, such a process would probably only
> need to be run for a day a week to treat scrubber water from storage tanks
> (i.e. never put out to lagoons or open storage where it is of great risk to
> the environment).
>  The equipment required to do that is far less complicated than the
> gasifiers themselves.
> Regards,
> James                              Posted by: James Joyce
> <james at jamesjoyce.com.au> <james at jamesjoyce.com.au>
> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
> Email:  psanders at ilstu.edu
> Skype:   paultlud    Phone: +1-309-452-7072
> Website:  www.drtlud.com
> On 1/7/2016 10:45 AM, linvent at aol.com wrote:
> Tom,
> Thanks for the compliment and appreciation. There were hundreds of "pot"
> trials using a wide variety of treatments, extractions, etc. before the key
> process was accidentally stumbled on. Other processes have evolved and
> include the ability to take sea-water to potable with a fraction of the
> cost of distillation or RO.
> Assumptions about the tar properties including specific gravity can be
> quite misleading.
> One aspect of how to deal with the produced water from a gasifier is to
> give it the right type of compound definition and once that is reached, it
> makes it much easier to treat it.
> Sincerely,
> Leland T. "Tom" Taylor
> Thermogenics Inc.
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